YMGI WMMS-21CH Instruction Manual

LITERATURE: LIT-WMMS-(59) (2)-DC IVTR-AM-II-20130409
Literature Part No:
Subject to Continuous Engineering Change and Product Improvement without Prior Notice.
LIT-WMMS-(59) (2)-DC IVTR-AM-II-20130409
YMGI is the Trademark and Property of YMGI Group New Energy. Copyright of YMGI Group .Energy
YMGI Group, POB 1559
YMGI Group New Energy, POB 1668
O'Fallon, MO 63366, USA
Tel:[phone] Fax:[phone]
Web Site: www.ymgigroup.com
Email: [email protected]
INSTALLER'S INSTRUCTION & USER'S MANUAL
DC INVERTER MULTIPLE ZONE (59) (2)
SYMPHONY CHOIR
OUTDOOR UNIT (CH)
This product is designed and manufactured free from defects in material and workmanship for normal use and maintenance.
Installation, operation, maintenance and service shall follow professional practices for regular cooling and heating equipment,
NEC, State, City or Local Codes and related manuals from YMGI. Otherwise, damage to equipment or property and even
injury to people may occur.
Installer: Currently licensed HVAC technician only. Read manual before installation. Fully fill in warranty registration card.
User: Keep this manual for future maintenance and service use.
Servicer: Use this manual for service reference.
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

MUST READ
CONTENTS
P1 OF34 P2 OF34
12
13
15
11
4
12
30
31
32
33
34
19
2
3
LIMITED PRODUCT WARRANTY POLICIES
LIMITED PRODUCT WARRANTY REGISTRATION CARD
WARRANTYAND TECH. SUPPORT
USER NOTES AND SERVICE LOG
MEMO
NAMES OF THE PARTS
TECHNICAL DATA
OUTDOOR UNIT WORKING TEMPERATURE RANGE
ELECTRICAL CONNECTIONS
INSTALLING OUTDOOR UNIT
MAINTENANCE
CHECK AFTER INSTALLATION
INSTALLATION CLEARANCE
HANDLING
23
25
26
27
28
28
31
FAULT INDICATION
WIRING DIAGRAMS
WARNINGS FOR INSTALLATION, OPERATION, MAINTAINING AND SERVICE
16
16
16
17
17
18
18
RECOMMENDED TOOLS FOR INSTALLATION
INSTALLATION POSITIONS FOR OUTDOOR UNIT
HEIGHT LIMITS OF INDOOR AND OUTDOOR UNITS
INSTALLATION-OUTDOOR UNIT
WIRING OUTDOOR UNIT
INSTALLATION OF ACCESSORIES
VACUUMAND LEAKAGE CHECK
RELEASE REFRIGERANT FROM OUTDOOR TO THE INDOOR UNIT
SYSTEM INSPECTION AND TRIAL RUNNING
All Units Shall Be Installed by Experienced or Licensed Contractor Or
Technician. Read Manuals before Installation.
YMGI Group Will NOT TakeAny Responsibilities for Any Damage or
Loss Due to Do-It-Yourself(DIY) self-installation and other Improper Installation or Operation or
Natural Disaster.
Connect All Wiring Securely. Loose Wire or Other Bad Contact May Cause
Arc or Overheating and Fire Hazard.
Following NEC, State and Local Codes and Installation Instructions of All
Units, Otherwise Unit Warranty Will Be Void and Serious Damage To People Or Property May Be
Caused.
Don't Supply Power until All Wiring and Tubing and Checking is
Completed. Ground the Unit Following Instructions and NEC, State and Local Codes.
Installation or Service Technician to Contact Manufacturer Technical Support
Toll Free Number: 1-866-833-3138 x 703
Email: [email protected]
(For any abnormal or unit issues, end user needs to contact installation or service contractor
to check the unit, before having them contact manufacturer technical support for technical
diagnosis or trouble shooting help.)
YMGI Group (YMGI) products are designed and manufactured free from defects in workmanship and
materials for normal use and maintenance. YMGI products are designed and manufactured to the qualities
to keep installer(s) and user(s) from any trouble and to bring total comfort to unit(s) owner(s) and end user(s).
LIMITED PRODUCT WARRANTY
-STANDARD POLICIES
YMGI warrants its products against any unexpected issues occurred to product itself, though designed and
manufactured and expected to work much longer than the warranted period, as follows:
1. Five-year compressor and sealed system
2. One-year other parts
3. Ground shipping only
Above warranties valid only if all the following are satisfied:
1. The unit was fully installed by currently licensed HVAC technician(s), from beginning to completion.
2. The unit is installed per NEC codes and local codes.
3. The unit is installed following installation instructions coming with YMGI products, and/or provided by YMGI Group.
4. The unit is fully checked and tested by installer(s) to make sure installed unit functions as designed.
5. Correct operation of the unit is explained clearly to the owner(s) by installer(s).
6. All fields are filled or checked, signed and dated by both installer(s) and owner(s) on theLIMITED PRODUCT WARRANTY
REGISTRATION CARD.
7. Warranty Registration Card must be mailed, along with an Original Copy of Full System Installation Service Charge Invoice
from the Currently Validly Licensed HVAC Technician Company, within 7 calendar days after the original installation is finished or
your NEW home (unit is not checked or used yet) is closed, whichever comes later, by the owner(s) to Warranty Department, YMGI
Group, POB 1559, O'Fallon, MO 63366, USA.
A full copy of Warranty Registration Card and Original Copy of Full System Installation Service Charge Invoice
must be kept by owner(s) safely along with other documents that come with the product.
No warranty may be valid if any one of above 7 conditions is not fulfilled. Warranty begins on the date of the
original installation or the date of NEW home (unit is not checked or used yet) is closed, whichever comes later.
As its only responsibility, and your only remedy, YMGI will furnish replacement part only (no labor), without charge for the
PART(S) and Ground Shipping ONLY, to replace any part found to be defective due to manufacturer’s workmanship or
materials under normal use and maintenance. Any part replaced pursuant to this warranty is warranted only for the
unexpired portion of the warranty term applying to the original part.
This warranty does not apply to nor cover any other cost associated with the service, repair or operation of the product or
the like.
Defective product(s) or part(s) must be identified by your installer, along with YMGI Group-approved Service Center(s)
or Technical Support., whichever is available in the area where unit is installed. Final decision is made by YMGI Group.
An “YMGI Group Customer Service/Technical Support Form Daily Log Sheet” must be filed properly for effective
communication and/or file management purpose.
Warranty policy herein DOESN'T cover:
1. Any damage or repairs to properties and injuries to person(s) as an incident or consequence of faulty or improper transportation,
installation, operation, maintenance, or service that ISN'T physically performed by YMGI Group.
2. Any damage caused by frozen or broken water pipes in the event of equipment failure, any damage or injury as a result of floods, fires,
winds, lightning, accidents, corrosive atmosphere or other conditions beyond the control of YMGI Group.
3. Any damage resulted from use of components or accessories not specified, supplied or designated by YMGI Group.
4. Any damage because of failure to start due to interruption and/or inadequate electrical service.
5. Any products sold or installed outside the United States or Canada.
6. Any labor charge from your technician company during any stage of the installation or service, for any reasons.
Any damage due to service performed by third parties, it is the product receivers(s) or owner(s)'s responsibility
to claim such damage resulted from these activities to the responsible party:
1. Transportation, installation and operation.
2. Normal maintenance and service as described in the installation and operating manual, such as cleaning of the coils, filter, cleaning
and/or replacement and lubrication.
YMGI keeps on product improvement and such improvement is purposed to further benefit installers, owners, users and
others. Such improvement or changes, even without notice, including but not limited to specifications, functions,
appearance, sizes, packages or others, of the products are YMGI's sole right(s). These improvement or changes will not
invalidate the limited warranty stated herein.
For further information about this warranty, contact Warranty Department, YMGI Group either by
faxing to [phone] or by mailing to Warranty Department, YMGI Group, POB 1559, O'Fallon, MO 63366, USA
LIMITED PRODUCT WARRANTY POLICIES
NOT TO CROSS-WIRING & NOT TO CROSS-PIPING
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
CUSTOMER AND TECHNICIAN MUST READ

MUST READ MUST READ
P3 OF34 P4 OF34
LIMITED PRODUCT WARRANTY
REGISTRATION CARD / FORM
YMGI to Fill Top Portion, at Shipping, and Keep Copy A; Center Copy B for Installer to Fill and Mail back to YMGI; Bottom Copy C for Customer to Fill and Keep
Installation Finished and Unit Works Successfully.
Print Name of Installation HVAC Technician:
Signature:
Date and time:
Installation Finished and Unit Works Successfully.
Print Name of Owner:
Signature:
Date and time:
1) Are you the only one to install whole system?
If not, % of installation done by you (HVAC technician).
3) Did you read the User Manual and Installation Instruction, before you
started the installation?
5) Supply electrical power V/Ph/Hz measured at wiring terminal block of
Indoor unit: outdoor unit:
7) Wire gauge, length and terminal colors between circuit breaker/
disconnect switch to outdoor unit:
9) The size of HVAC circuit breaker/fuse or disconnect switch to the
outdoor unit:
11) What is the refrigerant pipe length between each indoor unit and the
outdoor unit? Unit A Unit B Unit C Unit D...
13) What is the elevation difference between each indoor unit and the
outdoor unit? Unit A Unit B Unit C Unit D...
(indoor unit above outdoor unit +, below -)
15) Where is the outdoor unit located?
Ground wall balcony roof other
location or pad
17) Were the refrigerant pipe ends capped or taped seal, prior to running
them through structures to keep debris from entering the copper lines?
21) Did you check if the compressor can be started and stopped in a
correct (design) manner?
25) Have you checked all unit functions, with customer's witness, and all
functions are correct?
27) Do you provide regular one-year free technical service for this
installation?
2) What had been done, prior to your arrival?
4) Who unpacked the unit and accessory boxes to check for damage?
6) Incoming electrical power V/Ph/Hz measured at terminal blocks of
indoor unit: outdoor unit:
8) Wire gauge, length and terminal colors between each indoor and
outdoor unit: Unit A Unit B Unit C Unit D...
12) Where is/are the indoor unit(s) located?
Unit A Unit B Unit C Unit D...
16) Have you checked to make sure there is no cross-piping and no
cross-wiring between any two indoor units (zones)? How did you do it,
who was with you?
22) If copper length were not made to the supplied or recommended
refrigerant pipe length, how much refrigerant added or deducted?
26) Did you show the user how to operate the unit? Did he/she understand you?
Contact Where the Units are Installed:
Name:
Address:
City: State (Province):
Contact of the Installing HVAC Contractor/Technician:
Technician Full Name (Print):
HVAC Technician's Company Name:
Address:
Currently Licensed or Certified HVAC Technician License or Certification Number:
Official Phone # to Check the License Validity:
Phone: Fax:
Email:
Country:
YMGI-Recommended Contractor/Technician:
Phone:Fax:
Email:
City:State (Province):License Approved or Certified by:
The Company the
Unit Was Sold Though:
Did the Company
Pay to YMGI:
Installation Invoice Attached
to the Registration Card
For
YMGI
Use
Only
Unit #5
Unit #6
Unit #7
Unit #8
Outdoor Serial Number (One Outdoor
Unit, One Registration Card/Form):
Indoor
Serial
Number:
For Multi
Zone Units
Unit #1
Unit #2
Unit #3
Unit #4
Shipping Packing
List Number: Registration Card Serial No.
Date the Filled Registration
Card YMGI Received:
Unit(s) Work
Successfully (Yes/No): Warranty
Approved Warranty
Denied
18) Have you checked and run cooling or heating, one unit by one unit, all
working fine?
20) Did you vacuum correctly to check the connecting pipes and indoor unit for
leakage, what was the micron gauge reading, for how many minutes?
24) What were the measured temperatures (probe not touching any metal):
OOO
At cooling: indoor return air F, discharge air F, and outdoor F
OOO
At heating: indoor return air F, discharge air F, and outdoor F
23) Measured refrigerant pressures at outdoor service suction valve, when unit
was st. O
Heat pump (PSI): Cooling (PSI): Outdoor Ambient Temp. ( F):
HVAC Contractor/
Technician--Name
Hired YMGI-Recommended
HVAC Contractor/Technician?
List for Installating HVAC Technician to Double Check Installation Quality, and Warranty Processing Purpose (if not filled by technician, or not filled fully, warranty will void)
10) Are the inter-connecting wires and copper lines between indoor and outdoor
units installed/covered/protected by line set covers, or anything else?
14) Did you check the indoor unit for condensate leakage and refrigerant
leakage, before and after connecting them?
28) Do you list the working details in the invoice and leave a copy to the
customer?
19) Did you charge the inter-connection copper pipes and indoor unit with
nitrogen to check for positive leakage (pressures 150-200PSI), before
conducting vacuuming leakage check?
By signing above, I acknowledge the liability and responsibility for any false statement or not telling all the facts, and I authorize YMGI to check the details of the filled above, and make its
decision on warranty. I understand our filing or filling the warranty card/form DOESN'T mean automatic warranty approval, because warranty is approved only to those qualified and successful
installations by qualified HVAC technician. I know the warranty, if approved, is a standard 5-year compressor and 1-year other parts only, without any labor coverage. I agree to and will follow
all the contents contained in the Limited Product Warranty Policy that YMGI, not other entity, stated in public, including but not limited to manuals, web site, email, etc.
Important Note: A copy of the installing HVAC company's invoice to show all their work details, your payment proof, center copy B of this registration card filled after a successful
installation, all three (3) MUST be mailed together to Warranty Dept., YMGI Group, POB 1559, O'Fallon, MO 63366, for warranty processing. Customer keeps bottom copy C. YMGI
will check against copy A that was kept at YMGI.
Is the outdoor unit anchored to
ground or secured onto wall
bracket?
LIMITED PRODUCT WARRANTY REGISTRATION CARD CUSTOMER AND TECHNICIAN MUST READ
PRIOR TO OPENING THE BOX OF, OR INSTALLING /
SERVICING THE PRODUCT (HVAC & R)
Upon the purchasing, unpacking, installation and/or service of this product, you and all other parties hired to
install or service your products, have read all YMGI Group (we) has written hereafter and all agree:
1) You understand all that is written hereafter in this and other documents that we publish.
2) You will follow what is written hereafter in this and other documents that we publish.
3) You will be bound by and completely follow all policies, guidelines, instructions, warnings, attentions and other
materials, as published by YMGI Group, its subsidiaries or sister companies, in writing.
4) Only a successful installation, fully (100%) conducted by a qualified HVAC technician(s), as detailed in the
checklist of the Limited Product Warranty Policy and Limited Product Warranty Registration Card/Form,
along with a properly detailed installation invoice, is eligible for the Limited Product Warranty.
5) Failure to follow what is written hereafter may cause various equipment issues that you will take full
responsibility and liability for, including, but not limited to, losing manufacturer's warranty, unit not working
properly, unit malfunctions, under-performance, decreased safety, increased potential of various damages to
your property, body, home and/or business, etc.
6) YMGI documents and policies supersede those made or provided by the sales distributors or installing
contractors. YMGI Group maintains the final authority in explaining and resolving any and all discrepancies
that might exist between distributors/contractors' documents and ours.
YMGI STRONGLY RECOMMENDS:
* Customer hires a currently licensed/ certified HVAC technician(s) (N.A.T.E. or A.C.C.Acertification is strongly
recommended) to conduct 100% of the installation, inspection of all unit functions and repair service.
* Customer signs an installation/service contract with the installation/service technician's company who has good
service references and you trust. Installation and service is very important to the life of your investment and
provide you a lifetime of comfort and peace of mind.
* Customer requests the installer to put down a1-year labor warranty coverage in the installation contract.
* Have the technician check against all the items in the checklist of the Limited Product Warranty Registration
Card/Form, sign and date it, to help ensure a proper and professional installation.
* Customer pays in full, only after all the unit functions are inspected, the unit works properly, warranty checklist
is fully filled out and signed and you are fully satisfied.
* If any unit abnormality is found, have your technician check the unit first. Have them call for manufacturer
technical assistance, if necessary, from your job site, not his office, so that we can more accurately assist him
in diagnosing the cause of the malfunction.
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

MUST READ MUST READ
P5 OF34 P6 OF34
Dear Customer(s)/End User(s)/Unit Purchaser(s)/Installer(s)/Contractor(s)
Thanks for choosing YMGI products.
The YMGI equipment you purchased is either a split-type or a self-contained cooling/heating system which
requires an installer's license, certification, knowledge, experience, carefulness and details for a successful and
good installation. This equipment is different from those window or portable air conditioners you can normally
purchase from local retail stores such as Home Depot, Lowe's, Sears, etc. which the manufacturer may not
require licensed personnel to install.
Reading and following the YMGI Group recommendations, suggestions, and requirements, written in the
following pages and other documents, is the first step in our hope and effort to help ensure a smooth installation
& proper operation of your products for many years.
WHY DOES YMGI GROUP REQUIRE INSTALLATION AND SERVICE TO BE
PERFORMED BY LICENSED OR CERTIFIED HVAC TECHNICIAN/
CONTRACTOR?
1) They have the training and experience to accurately and safely install and service your equipment.
The equipment runs with high-pressure refrigerant and oil and line-voltage. The copper lines must be installed
properly to prevent leakage and foreign substances from contaminating the refrigerant system.
2) You will save money in the long run.
If any problems occur on the unit that is fully installed by the licensed or certified contractor, they have the
training and experience to correct the problem more efficiently.A technician(s) may be unwilling to repair an
issue on a unit that they did not install. If you do find a technician willing to perform the service, there is an
increased possibility of higher service fees than normal, increased service visits, or delayed service from that
technician.
3) It's the law!
The federal, state and/or local government and authorities have various governing laws or regulations,
guidelines, ordinances, etc., requiring only licensed or certified professionals can install and service high
pressure HVAC equipment.
SUGGESTIONS, TO AID YOU IN HIRING AN HVAC CONTRACTOR:
1) Hire a currently, practicing, licensed/ certified HVAC technician/ contractor. Technicians, who are no longer
practicing (retired, etc.) in this field, may not have the updated knowledge or may lack experience on the
equipment you have purchased.
2) Hire a technician/ contractor who services customers in your local area and you are familiar with. Local
contractors have a faster response time and will be easier for you to determine if they are reputable.
3) Use only reputable licensed/ certified HVAC installation contractors/ technicians to prevent any unexpected
charges as a result from unethical business practices.
4) Check their references, to verify they are a good service provider to the general customers. N.A.T.E orA.C.C.A
certified technicians are strongly recommended.
5) Some contractors/ technicians may not feel comfortable about installing the equipment that you purchase for
them to install, and they prefer to purchase and install the equipment. You can contact YMGI directly to check
and see if there have been any contractors in your area who have installed our products or similar.
6) Ask for a detailed quote for the whole installation project. A flat rate quote is the safest contract for both you
and the contractor
7) Your local HVAC technicians may charge you on a project basis or on an hourly basis. To our general
knowledge and experience, a full single head installation may normally cost anywhere from $800 to
$1500. These costs are estimates and your actual costs may differ due to job nature and location.
8) Number of hours can vary depending upon each individual situation, some factors are, but not limited to:
9) How difficult or complex the indoor unit is to be securely installed.
10) Hoe difficult or how long the inter-connecting pipes and wires are to be installed.
11) If all the suggestions have been taken and all the necessary steps are followed.
The cost of not having your unit installed properly can be more expensive than spending the little extra money
that hiring the right contractor will cost. Protect your investment and warranty eligibility by doing it right the first
time.
THE FOLLOWING LISTS THE JOBS AND RESPONSIBILITIES OF THE
TECHNICIAN/ CONTRACTOR:
* Performing a load calculation for the room(s) you would like to air condition. Cooling requirements will be
different from the heating requirements. They will consider cooling hours, heating hours and your special needs
or requirements. Supplemental heating such as baseboard heater or portable heater may help you save money
by not over-sizing or under-sizing the heating equipment.
* Selecting the right type, size or model of cooling and/or heating equipment.
* Determining the best location to install the unit. (Positioning indoor unit, outdoor unit and running the inter-
connecting pipes/wires.)
* Selecting the correct electrical components (HVAC circuit breaker or fuse and disconnect switch for the electric
power to the outdoor unit, types and sizes of the connecting wires between circuit breaker/disconnect switch
and outdoor unit, and the wires between outdoor unit and indoor unit).
* Keeping the indoor unit away from the ceiling and the outdoor unit away from the wall, bushes and other
obstacles at a proper and safe distance to allow for the proper airflow through the unit's.
* Placing the units on a secured level structure.
* Taping and sealing both ends of the inter-connecting pipes, before running them through structures, to prevent
dust or other debris from getting into the pipes otherwise they will contaminate and damage the refrigeration
system. Failure to follow this practice will make your factory warranty void.
* Connecting the inter-connecting pipes between the outdoor and indoor units. Checking for leaks through
pressurization with nitrogen. After releasing nitrogen, evacuate the piping and indoor unit, for removal of system
contaminants. Finally refrigerant introduction and adjustment, if necessary, from the outdoor unit.
* Back-seating the stopping valves at outdoor condensing unit to release pre-charged refrigerant from outdoor
unit to indoor unit.
* Measuring and recording the electrical voltages at different terminals and the refrigerant pressures at stopping
valves of outdoor condensing unit.
* Verifying and ensuring the unit is connected to the proper electrical power supply.
* Adjusting refrigerant levels (if necessary) following the installation instructions or chart on the unit.
* Checking for any unusual noises and other abnormalities that might be present.
* Operating the unit and check all functions, one by one, and explain to the owner how to operate and maintain
the unit.
* Completing all fields in detail on the installer checklist, signing and dating the Warranty Registration Card/Form.
LIMITED PRODUCT WARRANTY
If the installation is successfully and fully done by a qualified licensed/ certified HVAC technician/contractor, the
registration card/form is filled completely and correctly, and filed along with a valid installation invoice from the
contractor company within 7 days of the original installation, the following standard Limited Product Warranty is
qualified:
5-year on compressor and 1-year other PARTS ONLY. There is no labor coverage.
12) If the contractor(s)/technician(s) are experienced with the systems/brands you purchase.
You might spend less. But remember, many times you get what you pay for.
13) Sign a contract with them. The contract should list all the detailed work they will conduct and the standards
they will follow. Some contractors are willing to include a 1-year installation/service warranty at no extra
charge. Check with them to see if that is available. If available, include that in the contract.
14) Verify and confirm the installation is done completely and all the unit functions have been checked and are
working properly, all the items in the checklist have been checked and marked well in the warranty registration
card/form, prior to paying the contractor in full.
CUSTOMER AND TECHNICIAN MUST READCUSTOMER AND TECHNICIAN MUST READ
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

MUST READ MUST READ
P7 OF34 P8 OF34
1) The YMGI Limited Product Warranty Policy, details the eligibilities, coverage's and other explanations of the warranty
terms between YMGI group and the unit owner.
2) The YMGI Limited Product Warranty Policy and the Warranty Registration Card/Form are either included inside the
user's manual and/or installation instruction manual, or come separately in the unit packaging box/envelope. If for any
reason they are not included with your shipment, contact our sales or customer service to request a copy (electronic or
printed), prior to installation.
3) The checklist, in the Warranty Registration Card/Form, is for the currently licensed/ certified HVAC technician to fill out
completely, whileverifying all unit functions are operating correctly. This checklist is for the technician to test and check all
details of your unit, to verify and ensure its proper operation.
4) The technician must complete all fields in the Warranty Registration Card/Form, especially the unit model and serial
numbers and distributor information, and most importantly, the technician checklist.
5) Warranty Registration Card/Form shall be mailed, along with the original copy of the currently licensed HVAC
contractor's full installation invoice, to YMGI Group, within 7-days after original installation, in order for YMGI to review
and process your warranty registration.
6) Keep a copy of Warranty Registration Card/Form for your own use in the future, to aid in any possible future warranty
claiming, any request of parts, customer service, and/or technical support.
7) YMGI reserves the right to approve or deny the warranty status based on the information reviewed.
Mailing address of the Warranty Registration Card/Form: Warranty Department, YMGI Group, POB 1559,
O'Fallon, MO 63366, USA.
Following these requirements will aid in ensuring the units will be installed to the general HVAC practicing
standards and are necessary factory requirements, to find problems early, prevent possible damage to the unit
and help ensure the unit will work properly for its life time.
QUESTIONS ABOUT SELF-INSTALLATION VS HIRING LICENSED HVAC
TECHNICIANS
Does YMGI allow to do-it-yourself installations (DIY) partially or fully? NO.
Unfortunately no brand or manufacturer can take the responsibility of the equipment if it is not professionally
installed by a currently licensed HVAC technician/ contractor.
If unit is installed by non-licensed people, in part or fully, will the factory warranty be void? YES.
Some DIY installations have been successful, but these are exceptions. Most have resulted in equipment failure,
due to lack of knowledge and experience. Afew of the problems result from DIY's lack of knowledge in the
following areas:
* Sizing and selecting correct type, size and model of cooling and/or heating equipment.
* Sizing and installing correct electric circuit breakers and wires.
* Wiring the units correctly and properly.
* Taping the ends, connecting to indoor and outdoor units correctly and properly.
* Vacuuming the inter-connecting refrigerant lines.
* Checking and/or fixing the refrigerant leaks.
* Checking and/or fixing the condensate drain leaks.
* Releasing the refrigerant from outdoor unit to indoor unit.
* Running the unit to check all the unit functions.
* Conducting the installation or trouble-shooting with correct tools, experience or professional knowledge to
correct the problem.
RECEIVING AND FREIGHT DAMAGE
* If the damage is minor or partial, that you choose to accept, you can contact the distributor or YMGI to discuss
the possible replacement of the damaged part.
* If refusal of the shipment is needed due to severe freight damage, DO NOT sign the carrier's delivery receipt
document indicating that you accept the products. Mark receipt "REFUSED DUE TO FREIGHT DAMAGE."
Sign and date along with the delivery driver's signature and date.
* Take pictures showing the damage, before the delivery driver leaves.
* If you accept the delivery or fail to note damage on the driver's delivery receipt, the ability to claim freight
damage is lost and YMGI will not replace the unit on this basis.
* Contact the distributor or YMGI, report the damage by forwarding the marked delivery receipt copy and pictures.
* Only after YMGI verifies with the carrier the necessary detailed notes of received freight damage, will the
damaged products be eligible for replacement.
* If the returned products are found not damaged, YMGI will treat it as a return and will charge you 25% of
product value plus added shipping cost.
RETURN-YMGI GROUP POLICIES & RETURN GOODS AUTHORIZATION (RGA)
All sales are final. If the customer wishes to return a product, the following Return Policies apply.
A. Only those products (units, parts or accessories) under the following conditions, are eligible for return:
1) Products are returned within 30 days of their original shipment date from YMGI
2) Products have not been installed.
3) No damage exists on the products being returned.
4) No missing products.
5) Products and packages are clean.
6) No duct tape or marking on the product or box.
7) Products are still their original package, in good shape and in re-sellable condition, as YMGI determines.
ATTENTION
B. Preapproval steps for your return request:
1) Contact your distributor or YMGI to request a return.
2) Photograph your product and box to show details
3) YMGI will review your request, along with the pictures and any other details pertaining to your request.
4) If YMGI agrees to process your return request, a form called Return Goods Authorization (RGA), along with
an assigned RGA # will be forwarded to your distributor or you.
5) Any return without YMGI Group approved RGA#, will not be accepted.
C. YMGI must verify the following before you can pack your products:
1) No products (units, parts, accessories) are missing.
2) No damage is found.
3) The products are in the original packaging.
4) No duct tape on any product or box.
5) Pictures have been taken and sent to YMGI to verify the product and boxes are not damaged.
6) The RGA has been completed and a copy has been returned to YMGI, via email or fax.
7) YMGI has approved the request in writing.
* Freight (package/unit) shall be checked thoroughly for damage at receiving before accepting by signing on the
carrier's delivery paperwork.
* Upon shipment being signed for acceptance, it becomes a binding document as to the condition of the products
on delivery. We cannot process any shipping damage claim, if you accept the delivery.
* If damage is found at delivery, both you and the delivery driver must make notes on the delivery receipt or other
freight paperwork detailing the damage found by marking position/parts on unit, description of damage, time/
date, your name, contact phone, etc. on the delivery documents. Make a copy of the marked delivery receipt.
D. Shipping Preparation:
1) Package all products in a manner in which no damage can occur to the product and secure to a pallet.
2) Take and forward pictures of packed pallets for YMGI to verify proper packaging and no existing damage.
3) Include the YMGI approved RGA# in the shipping documents.
4) YMGI reserves the right to approve or deny any shipments.
5) YMGI can arrange shipping for you, but not at YMGI's cost. If this option is chosen, a packing list and BOL will
be issued to you through YMGI.
6) If the above option is not chosen, you will be responsible for all freight charges. YMGI will not accept any
returned items COD.
7) Place the package in an area which is accessible to the shipping company for pickup and limits the possibility
of damage to the product. Customer must be present at the time of freight pick up.
After shipping, fax the BOL to YMGI Group at 1-866-377-3355 or email to [email protected],
detailing the information of the freight company and their tracking number.
E.Freight Damage:
1) YMGI Group will inspect returned items
2) Claiming of freight damage from a customer hired carrier will be the customer's responsibility.
3) Claiming of freight damage from a YMGI hired carrier will be YMGI's responsibility.
CUSTOMER AND TECHNICIAN MUST READCUSTOMER AND TECHNICIAN MUST READ
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

MUST READ MUST READ
F. Charges for your return:
1)A restocking charge of 25% creditable invoice value.
2)All return shipping fees.
3)Additional fees will be charged, if products are found to be damaged, missing or used.
4)YMGI will notify the distributor of the charges only after the inspection and assessment of the returned products
has been completed.
Attention:
1) Returned products must be shipped within 7 days of YMGI's releasing of RGA #.
2) All RGA shipping shall be prepaid by the customer. YMGI will not accept any COD freight.
YMGI GROUP DISCLAIMING-1:
YMGI Group will NOT accept any return, or may not honor 100% credit for any return of Product(s)/Part(s)/
Accessories, in any of the following cases:
* Return requests made 30 or more days after the date of original sales shipping from YMGI Group warehouse.
* Return shipment is initiated 8 days or more after the RGA is approved.
* Returned products received not displaying an YMGI-approved valid RGA #.
* Returned products received C.O.D.
* Returned products not received in the original packaging.
* Returned products received with non-repairable packaging, including duct tape or marks on units or carton
boxes.
* Returned products received with missing units/parts/accessories.
* Returned products received, are found to be non-functional or damaged.
YMGI GROUP DISCLAIMING-2:
* YMGI Group will not be responsible for any losses of returned unit(s)/part(s)/accessories in transition to YMGI
Group warehouse.
* YMGI Group RGA is valid for seven (7) days from the original issuing date. Returns will not be accepted, if
shipping is made 8 or more days after the YMGI Group RGA is issued.
DEFECTIVE UNITS / PARTS / ACCESSORIES-REPAIR OR REPLACEMENT
Out of thousands of units sold every year, there may be an occasional instance your product does not operate
properly. Reasons of but are not limited to:manufacturing, installation, operation, maintenance and
knowledge of operator.
The defects might be found before/ during installation or in the operation of the unit. Defects can be in the form
of blown fuse(s), defective control board(s), damaged remote control, loose or missing screws, etc. These
defective parts can be replaced easily.
Some functions of our units are different from what are typical in traditional split type air conditioning and heat
pump systems and similar systems made by other manufacturers. These are not defects. Take some time to
learn the functions of your unit. We will be happy to assist you with any questions you may have concerning the
functions of your new unit.
1. Part repair or replacement after trouble-shooting: This is the most common and generally the easiest and
most economical way for all parties, since the problem and all part needs can be accurately and completely
identified.
* Your technician callsour technical support line, from your job site, after checking your units and getting all the information
ready.
* Our technical support will go through several steps, over the phone or through email, with your technician, in order to help
identify and resolve the problems. Normally wiring correction, piping correction, part repair/ replacement will resolve the
problems.
* Your technician will then need to verify and confirm the problem(s) beforeYMGI can ship out the replacement part(s).
Inaccurate or incomplete troubleshooting or part replacement will delay the repair. YMGI technical support will only speak
with a licensed/certified technician in regards to the repair of your unit. In our experience this saves time and money for
all parties involved.
Your technician is the only person to perform any physical checking, trouble-shooting and replacing of any
defective part(s) for your units. Our factory technical support is just a help. YMGI provided no labor warranty
on the products.
2. Unit/part repair at our workshop(s): Due to the limitations of our technical support not being at your job site,
or your technician's experience with our product, the problem may not be resolved as quickly as would be
desired. If the problem is still not resolved after attempts between your technician and our technical support,
you can elect to have the unit repaired at our facility. If this step is chosen:
1) YMGI will send to you the Customer Request to Ship Products to YMGI Service Center for Inspection and Repair,
and Authorization to Charge form.
2) You will review the form and fill all fields appropriately, sign and send back to the YMGI Group.
3) Once the form has been completed and sent back to YMGI, remove the units and ship back to YMGI.
Please make a note describing the problem and communication history, if possible. Our technicians will check the
units and find the problem(s), repair the issue(s), and ship the unit back to you following the conditions set forth in
the signed repair agreement. All unit removal and re-installation is done at your costand must be done by a
currently valid licensed HVAC technician.
3. Unit replacement: Only applies to those defects reported within 30 days of original purchase date and if all
necessary warranty paperwork had been received and approved. This option applies only if the above steps
cannot resolve the problem(s). Either indoor or outdoor unit replacement is available, based on the actual need,
at YMGI's determination. This option shall be the last resort, due to refrigerant and wiring considerations. All
unit removal, re-installation and shipping cost are the responsibility of the customer.YMGI maintains the final
authority as to unit replacement. Replacement will be made with the same model only. Alternate units will be
treated as a new order.
Returning Replaced Defective Units/Parts/Accessories After Unit Repair: (Only applies to steps 1&3 above)
1) Repack the replaced unit/ part /accessory in the box which contained the replacement part.
2) Parts can be boxed for UPS, FedEx or equivalent ground service. Units shall be secured onto the skid on which the
replacement was shipped after placing into the package from the replacement product.
3) Ship all replaced products, to YMGI-designated location. You will be charged if YMGI does not receive the replaced parts.
Standard factory warranty does not cover the cost of materials and labor that are incurred at your site.
There will be no cost for the replacement unit, if YMGI determines the defect is manufacturer related.
Replacement will be made with the same model, only. Alternate units will be treated as a new order.
CUSTOMER SERVICE / TECHNICAL SUPPORT FROM YMGI GROUP
For questions or help with your unit, contact the original installer or service provider.
YMGI Group does not install nor physically service your unit. Your installer or service provider must check the
unit prior to contacting YMGI Group from your jobsite, in order to be helped in an efficient and timely manner.
* Factory customer service at [email protected] Tel: [phone]x704
* Factory technical support at [email protected] Tel: [phone]x703
* Fax: [phone]
An "YMGI Group Customer Service/Technical Support Daily Log Sheet" will be filed in writing at our office,
for effective communication between you and YMGI Group customer service, your technician and YMGI Group
technical support. Before contacting the YMGI Group locate the IP# written at the top of your warranty registration
form. Use this IP# whenever you contact the YMGI Group.
Equipment failure does not automatically denote a product defect from the factory assembly line. The defects can
be caused, during production, transportation, installation, operation, maintenance, or service. Defects may NOT
be the responsibility of the manufacturer. Nobody willfully or intentionally produces a defective product. No
determination shall be made until the technical issue(s) or the causes of the defect(s) are identified.
If a defect is found, whether at the original installation, or during normal operation, we will gladly help you in the
following steps in sequence from 1 to 3: DISTRIBUTOR AND MANUFACTURER POLICIES
* All questions concerning sales or money will be directed to the sales distributor from which you purchased the
units.
* Read and follow all policies set forth from the distributor from which you purchased your unit.
* Upon purchase and installation of the unit(s), you agree to be bounded by all policies published by both
distributors and YMGI.
* MGI Group has the final authority and supersedes other related parties (distributors, etc.) concerning all policies
regarding YMGI products.
CUSTOMER AND TECHNICIAN MUST READCUSTOMER AND TECHNICIAN MUST READ
P9 OF34 P10 OF34
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World ! YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

MUST READ
BRIEF UNIT INFORMATION
P11OF 34 P12 OF34
NAMES OF THE PARTS
TECHNICAL DATA
* Be sure to cut off the power supply before cleaning the air conditioner; otherwise electric shock
might happen.
* Wetting of air conditioner may cause the risk of electric shock. Make sure not to wash your air
conditioner in any case.
* Volatile liquids such as thinner or gasoline will cause damage to the appearance of air conditioner. (Only use
soft dry cloth moist cloth clean the air conditioner cabinet).
* This product must not be disposed together with the domestic waste.
This product has to be disposed at an authorized place for recycling of electrical and electronic appliances.
* The temperature of refrigerant circuit will be high, please keep the interconnection cable away from the copper
tube.
NO. WMMS-21CH
WMMS-30CH WMMS-24CH WMMS-36CH
MOD
Electricity supply
HVAC type fuse or circuit breaker
Minimum power cord size
Refrigerant charge (R410A)
Size
Electricity data
1Air Discharge grille
2Wiring Panel/Handle
3Valves
Front side panel/handle
Valves
Air Discharge grille
WMMS-42CH WMMS-48CH
W1 D0
H
12
3
Air Discharge grille
Valves Valves
Air Discharge grille
Front side panel/handleFront side panel/handle
Before cleaning, it is necessary
to stop unit operation and off the
power supply.
WARNINGS FOR INSTALLATION, OPERATION, MAINTAINING AND SERVICE
Must connect the unit to dedicated
HVAC circuit breaker of proper
size.
Shall not turn on and then off the
unit back and forth frequently.
Must not cut off or damage power
cables and control wires.
In case of any damage found on
wires, must replace with good one
without any delay.
Don't entangle electrical wires or
leave extra length of wire in the
unit.
Never use indoor wires for outdoor
use.
Not to connect unit to the wall
switch.
Disconnect the power supply, if
not using the unit for quite a while.
Never drag wires too hard, or use
wire to hang or band or fasten
anything.
Must turn off unit and disconnect
electrical power, before cleaning
or servicing the unit.
Suggest to put a warning sign at
the switch, to avoid accidental
turning on the power by somebody
who doesn't know service is in
process.
Don't attempt to install or repair the
unit by yourself. Saving on these
work is not worthy, since you miss
chance to have the professional
look into the unit for a full diagnosis
and complete repair.Also,
factory warranty will be lost.
Handy man may
successfully conduct some work.
But, it is about responsibility and
liability. Customer will have to take
responsibility and liability for the
DIY installation or or repair.
Don't step onto the top of unit.
Don't place anything atop of it.
The unit must be securely
grounded.
The cable shall be connected to
the grounding device in the
home or building.
When smelling a burning or smoke,
turn off unit and disconnect the
power and contact your installation
or service technician
without delay.
If the abnormal or danger is not
found and removed, keeping on
operating the unit will damage the
unit or even cause electric shock
or fire.
Only apply correct electrical power
to the unit (208-230/1/60).
The compressor will vibrate if the
voltage is too low or too high.
Electrical components may fail, if
voltage is too high.
Mounting bracket must be sturdy
and secured.
Outdoor unit,
especially the
heatpump
outdoor unit, must be installed at
least 3-5 inches above the ground,
to keep from possible ice being
built up in cold weather.
WMMS-60CH
Valves
Air Discharge grille
Front side panel/handle
1 2
3
1 2
3
1 2
3
1 2
3
W1
D0
H
30
10
56
33.3
15.0
23.5
30 30/40
10 8
88
35.25 35.25
15.75
27.6 27.6
WMMS-42CH
WMMS-21CH
WMMS-30CH WMMS-48CH
WMMS-24CH
WMMS-36CH
40
8
37.4
15.75
27.5
15.75
208-230/1/60
AWG
OZ
Inch
Inch
Inch
AMP
8888
WMMS-60CH
50
8
40.25
17.5
43.5
169
UNIT
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

BRIEF UNIT INFORMATION BRIEF UNIT INFORMATION
P14 OF34P13 OF34
USER NOTES AND SERVICE LOG
OUTDOOR UNIT WORKING TEMPERATURE RANGE
Maximum cooling
Minimum cooling
Maximum heating
Minimum heating
o
Outdoor side DB( F)
115(T1)
20
75
5
SPECIFICATION
Outdoor Unit Models WMMS-21CH-V2B(59)(2) (1 to 2)
WMMS-30CH-V2B(59)(2) (1 to 2) WMMS-24CH-V2B(59)(2) (1 to 3) WMMS-36CH-V2B(59)(2) (1 to 3) WMMS-48CH-V2B(59)(2) (1 to 4)WMMS-42CH-V2B(59)(2) (1 to 4)
Power Supply 208-230/1/60
Cooling Capacity*
(Btu/h)
Max. Allowed IDU Cap. Total 30,000 36,000 48,000 57,000
Rated 18,000 24,000 28,000 30,000
Min. 7,200 10,000 10,000 10,000
Total Power Input in
Cooling Mode* (W)
Max. 2300 3300 4500 4500
Rated 1550 2250 2600 2600
Min. 650 800 900 1000
SEER
HSPF
16.0
8.2
16.0
8.2
16.0
8.2
16.0
8.2
Heating Capacity*
(Btu/h)
32,000 38,000 50,000 59,000
Rated 19,000 29,500 31,000 33,000
Min. 6,500 9,000 9,000 9,000
Total Power Input in
Heating Mode*
Max. 2400 3000 3500 3500
Rated 1750 2500 2920 2920
Min. 650 800 900 1000
WMMS-60CH-V2B(59)(2) (1 to 5)
72,000
42,000
12,000
5100
3950
1200
16.0
8.2
74,000
46,000
10,000
4800
4400
1200
Compressor Manufacturer/trademark
Liquid Valve Size 2 x 1/4" 3 x 1/4" 4 x 1/4" 4 x 1/4"
Gas Valve Size 2 x 3/8" 3 x 3/8" 4 x 3/8" 4 x 3/8"
Sanyo / Mitsubishi / Others Sanyo / Mitsubishi / Others Sanyo / Mitsubishi / Others Sanyo / Mitsubishi / Others
Throttling Method Electronic Expansion Valve Electronic Expansion Valve Electronic Expansion Valve Electronic Expansion Valve
Starting Method Transducer starting Transducer starting Transducer starting Transducer starting
Recommended Working Ambient Temp Ranges (F) AC: 20 to 115 HP: 5 to 75 AC: 20 to 115 HP: 5 to 75 AC: 20 to 115 HP: 5 to 75 AC: 20 to 115 HP: 5 to 75
Condenser Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube Aluminum fin-copper tube
Output of Fan Motor (W) 60 60 60 60
Fan Motor RLA (A) 0.65 0.65 0.65 0.65
Fan Motor Capacitor (uF) 3 3.5 3.5 3.5
Air Flow Rate of Outdoor Unit ////
Fan Type-Piece Axial fan 1 Axial fan 1 Axial fan 1 Axial fan 1
Fan Diameter (Inches) 18.1 18.1 18.1 18.1
Defrosting Method Auto Defrost Auto Defrost Auto Defrost Auto Defrost
Climate Type T1 T1 T1 T1
Isolation IIII
Moisture Protection IP24 IP24 IP24 IP24
Max. Operating Pressure at High Side (PSI) 550
Max. Operating Pressure at Low Side (PSI) 175
Sound Pressure Level dB (A) (H/L) 56/54 56/54 56/54 56/54
Sound Power Level dB (A) (H/L) 66/64 66/64 66/64 66/64
Dimensions of Outdoor Unit (W x H x D) (Inches) 33.3 x 27.0 x 11.8 37.4 X 27.5 X 15.5 37.2 X 27.6 X 15.75 37.4 X 27.5 X 15.5
Dimensions of Package (W x H x D) (Inches) 39.1 x 29.5 x 16.9 40.6 X 29.5 X 16.5 40.5 X 29.5 X 18.0 40.6 X 29.5 X 16.5
Net Weight /Gross Weight (LBs) 115 / 126 150 / 161 165 / 176 165 / 176
Refrigerant /Factory Pre-Charge for 25' (LBs) R410A / 2.97 R410A / 4.84 R410A / 4.84 R410A / 4.84
Loading
Quantity
20' Container 87 80 80 80
40' Container 183 170 170 170
40' High Cube Container 183 170 170 170
550 550 550
175 175175
30 30 30/40 40
L.R.A. (A) 27 45 45 45
Compressor RLA (A) 8.4 9.7 9.7 10
Compressor Power Input (W) 1245 2200
Fuse or Circuit Breaker (HVAC Type)
MCA (A) 15 20 20/30 30
Compressor Oil / FV50S / / FV50S / / FV50S / / FV50S /
2200 2200
4 x 1/4" + 3/8"
2 x 3/8" + 2 x 1/2" + 5/8"
Sanyo / Mitsubishi / Others
Electronic Expansion Valve
Transducer starting
AC: 20 to 115 HP: 5 to 75
Aluminum fin-copper tube
140
1.1
6
/
Axial fan 1
22.5
Auto Defrost
T1
I
IP24
56/54
66/64
42.25 X 43.5 X 17.5
46.0 X 48.6 X 19.4
225 / 248
R410A / 10.6
50
100
100
550
175
50
55
13
50
/ FV50S /
3000
Max. Allowed IDU Cap. Total
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
SAMPLE SIZE COMBINATIONS AND PERFORMANCE DATA
1) The DC inverter outdoor unit may work with many different combinations of styles (wall, ceiling, ceiling/floor, concealed, etc.) and sizes of indoor units.
2) In real world, there might be small percentage of applications where all indoor units will be working at peak demand of cooling or heating needs. One room
could be at peak demand, others may not. This way, the outdoor unit doesn't need to work at peak speed/load all the time.
3) Not all pairs of refrigerant valves need to be connected at initial installation. But, there is minimum amount of indoor units shall be connected (refer to the spec.
sheet for details).
If only few of indoor units are installed initially, other indoor units can still be installed in the future whenever ready (need to vacuum and adjust refrigerant
charge accordingly).
4) These outdoor unit can only drive all indoor units for one thermal mode at one time. Shall not run cooling in one indoor unit, and heating in another one. In
case of mode conflict or clash, correct the thermal mode which is different from others, or shut off power and select one thermal mode for all indoor units.
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
WMMS-2AM21-V2B(59)(2) / WMMS-2AM30-V2B(59)(2) Cooling Performance Nominal Data
9K 9K 10880 10880 (9180~12240) 1050 (1000~1300)
12K 12K 11900 11900 (9180~14960) 1050 (1000~1500)
18K 18K 17000 17000 11220~22780)( 1400 (1000~2600)
9+9K 18K 8500 8500 17000 11220~22780)( 1400 (1000~2600)
9+12K 21K 8500 11900 20400 11220~26520)( 1800 (1000~3300)
12+12K 24K 11900 11900 23800 11220~27880)( 2300 (1000~3800)
9+18K 27K 8840 15300 24140 11220~32300)( 2200 (1000~4600)
12+18K 30K 11900 12240 24140 11220~32300)( 2200 (1000~4600)
9+9+9K 27K 8075 8075 8075 24140 11220~32300)( 2200 (1000~4600)
9+9+12K 30K 7140 7140 9860 24140 11220~32300)( 2200 (1000~4600)
9+12+12K 33K 6460 8840 8840 24140 11220~32640)( 2200 (1000~4650)
12+12+12K 36K 8075 8075 8075 24140 11220~32640)( 2200 (1000~4650)
9+9+18K 36K 7480 7480 9180 24140 11220~32640)( 2200 (1000~4650)
9+12+18K 39K 7140 7820 9180 24140 11220~32640)( 2200 (1000~4650)
12+12+18K 42K 7820 7820 8500 24140 11220~32640)( 2200 (1000~4650)
WMMS-3AM24-V2B(59)(2) / WMMS-3AM36-V2B(59)(2) Cooling Performance Nominal Data
9+9K 18K 8500 8500 17000 11220~22780)( 1400 (1000~2600)
9+12K 21K 8500 11900 20400 11220~26520)( 1800 (1000~3300)
12+12K 24K 11900 11900 23800 11220~27880)( 2300 (1000~3800)
9+18K 27K 8840 15300 24140 11220~32300)( 2200 (1000~4600)
12+18K 30K 11900 12240 24140 11220~32300)( 2200 (1000~4600)
9+9K 18K 8500 8500 1400 (1000~2600)
9+12K 21K 8500 11900 1800 (1000~3300)
9+9+9K 27K 8044 8044 8044 2200 (1000~4600)
9+9+12K 30K 7140 7140 9860 2200 (1000~4600)
9+12+12K 33K 6460 8840 8840 2200 (1000~4650)
12+12+12K 36K 8044 8044 8044 2200 (1000~4650)
9+9+18K 36K 7480 7480 9180 2200 (1000~4650)
9+12+18K 39K 7140 7820 9180 2200 (1000~4650)
12+12+18K 42K 7820 7820 8500 2200 (1000~4650)
9+9+9+9K 36K 6800 6800 6800 6800 2480 (1000~4650)
9+9+9+12K 39K 1750 1750 1750 2750 2480 (1000~4650)
9+9+12+12K 42K 1500 1500 2500 2500 2480 (1000~4700)
9+12+12+12K 45K 1700 2100 2100 2100 2480 (1000~4700)
WMMS-4AM42-V2B(59)(2) Cooling Performance Nominal Data
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
12+12K 24K 11900 11900 2300 (1000~3800)
9+18K 27K 8840 15300 2200 (1000~4600)
12+18K 30K 11900 12240
10880 (9180~12240)
11900 (9180~14960)
17000 (11220~22780)
17000 (11220~22780)
20400 (11220~26520)
24140 (11220~32300)
24140 (11220~32300)
24140 (11220~32640)
24140 (11220~32640)
24140 (11220~32640)
24140 (11220~32640)
24140 (11220~32640)
27200 (11220~32640)
23800 (11220~27880)
24140 (11220~32300)
24140 (11220~32300)
2200 (1000~4600)
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
9+9K 10880 10880 21760 (8670~27880) 2050 (900~2950)
9+12K 10880 13600 24480 (8670~28900) 2300 (900~3300)
12+12K 13260 13260 26520 (10200~31620) 2400 (900~3500)
9+18K 9860 17000 26860 (10200~31620) 2400 (900~3500)
12+18K 12240 15300 27540 (10540~33660) 2400 (1000~3900)
9+9+9K 9180 9180 9180 27540 (10540~33660) 2400 (1000~4000)
9+9+12K 8500 8500 10540 27540 (10540~33660) 2400 (1000~4000)
9+12+12K 7480 10370 10370 28220 (10540~33660) 2450 (1000~4000)
9+9+18K 7990 7990 11560 27540 (10540~33660) 2400 (1000~4000)
12+12+12K 9690 9690 9690 29070 (10540~33660) 2500 (1000~4000)
9+12+18K 7480 9180 10880 27540 (10540~33660) 2400 (1000~4000)
12+12+18K 8500 8500 10540 27540 (10540~33660) 2400 (1000~4000)
9+9+9+9K 8160 8160 8160 8160 32640 (11220~37400) 2600 (1100~4200)
9+9+9+12K 7480 7480 7480 10200 32640 (11220~37400) 2600 (1100~4200)
9+9+12+12K 7140 7140 9180 9180 32640 (11220~37400) 2600 (1100~4200)
9+12+12+12K
18K
21K
24K
27K
30K
27K
30K
33K
36K
36K
39K
42K
36K
39K
42K
45K 6120 8840 8840 8840 32640 (11220~37400) 2600 (1100~4200)
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
WMMS-4AM42-V2B(59)(2) Heating Performance Nominal Data
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
9K 9K 9860 9860 (6630~15980) 1100 (850~2450)
12K 12K 13260 13260 (6800~17000) 1450 (850~2500)
18K 18K 19720 19720 (8670~27880) 1850 (900~2950)
9+9K 18K 10880 10880 21760 (8670~29240) 2050 (900~2950)
9+12K 21K 10880 13600 24480 (8670~30600) 2300 (900~3300)
12+12K 24K 13260 13260 26520 (10200~32640) 2400 (900~3500)
9+18K 27K 12240 17000 26860 (10200~31620) 2400 (900~3500)
12+18K 30K 12240 15300 27540 (10540~33660)
9+9+9K 27K 9632 9632 9632 28900 (10540~37400)
9+9+12K 30K 9010 9010 10880 28900 (10540~37400)
9+12+12K 33K 7820 10880 10880 29580 (10540~37400) 2400 (1000~3900)
2350 (1000~4000)
2350 (1000~4000)
2400 (1000~4000)
9+9+18K 36K 7990 7990 13600 29580 (10540~37400)
12+12+12K 36K 9860 9860 9860 29580 (10540~37400)
9+12+18K 39K 7480 9180 12920 29580 (10540~37400)
12+12+18K 42K 8500 8500 12580 29580 (10540~37400)
2600 (900~3800)
2600 (900~3800)
2600 (900~3800)
2600 (900~3800)
9+9K 18K 10880 10880 21760 (8670~29240) 2050 (900~2950)
9+12K 21K 10880 13600 24480 (8670~30600) 2300 (900~3300)
12+12K 24K 13260 13260 26520 (10200~32640) 2400 (900~3500)
9+18K 27K 12240 17000 26860 (10200~31620) 2400 (900~3500)
12+18K 30K 12240 15300 27540 (10540~33660)
WMMS-3AM24-V2B(59)(2) / WMMS-3AM36-V2B(59)(2) Heating Performance Nominal Data
WMMS-2AM21-V2B(59)(2) / WMMS-2AM30-V2B(59)(2) Heating Performance Nominal Data
Indoor Unit
Combinations Total
Capacity Room A Room B Room C Room D Capacity Rating-Btu/h
(Min. Max.) Input Power Rating-Watts
(Min. Max.)
RECOMMENDED MATCHING INDOORAND OUTDOOR UNITS (NOT ALL
POSSIBILITIES BEING LISTED)
1 Indoor Unit 2 Indoor Units 3 Indoor Units 4 Indoor Units
09K 12K
18K 09K+12K09K+09K
1 Indoor Unit 2 Indoor Units 3 Indoor Units 4 Indoor Units
4 Indoor Units
09K+12K
09K+18K 12K+12K 09K+09K+09K 09K+09K+12K 09K+09K+18K
1 Indoor Unit 2 Indoor Units 3 Indoor Units
Not allowed
Not allowed
09K+09K+12K 09K+12K+12K 09K+09K+09K+09K 09K+09K+09K+12K 09K+09K+12K+12K12K+12K 09K+18K 09K+12K+18K
09K+09K+24K 12K+12K+18K 09K+12K+12K+12K 12K+12K+12K+12K 09K+09K+09K+18K
12K+18K
1 Indoor Unit 2 Indoor Units 3 Indoor Units 4 Indoor Units
09K+09K+09K 09K+09K+12K
09K+12K+24K
09K+12K+12K 09K+09K+09K+09K 09K+12K+12K+18K 09K+09K+09K+12K
09K+09K+12K+18K 09K+09K+09K+18K
09K+09K+12K+24K 09K+12K+12K+24K
12K+18K 09K+24K 09K+09K+18K 12K+12K+12K 09K+12K+18K
12K+12K+24K 09K+09K+09K+24K 12K+12K+12K+12K
12K+12K+18K
Not allowed
Not allowed Not allowed
Not allowed
12K+24K
12K+24K
18K+18K 09K+12K+12K 09K+12K+18K 12K+12K+12K
18K+18K
Important Notes:
Indoor Unit Mix and Match Size Possibilities (Samples), to Work with: Outdoor Unit WMMS-21CH-V2B(59)(2) / WMMS-30CH-V2B(59)(2)
Indoor Unit Mix and Match Size Possibilities (Samples), to Work with: Outdoor Unit WMMS-24CH-V2B(59)(2) / WMMS-36CH-V2B(59)(2)
Indoor Unit Mix and Match Size Possibilities (Samples), to Work with: Outdoor Unit WMMS-42CH-V2B(59)(2)
Indoor Unit Mix and Match Size Possibilities (Samples), to Work with: Outdoor Unit WMMS-48CH-V2B(59)(2)
12K+12K 12K+18K24K
1 Indoor Unit
Not allowed
Indoor Unit Mix and Match Size Possibilities (Samples), to Work with: Outdoor Unit WMMS-60CH-V2B(59)(2)
2 Indoor Units 5 Indoor Units
09K+09K+09K+12K+12K/18K/24K
09K+12K+12K+12K+12K/18K
09K+09K+12K+12K+18K
09K+12K+12K+18K+18K
12K+12K
18K+18K
18K+24K
12K+18K
12K+24K
24K+24K
3 Indoor Units
09K+09K+09K
09K+09K+18K
12K+12K+12K
09K+09K+12K
12K+12K+18K
12K+12K+24K
09K+12K+12K
09K+12K+18K
09K+12K+24K
4 Indoor Units
09K+09K+09K+12K
09K+09K+12K+18K
09K+09K+12K+24K
09K+09K+09K+09K
09K+12K+12K+18K
09K+12K+12K+24K
09K+09K+09K+18K
12K+12K+12K+12K
12K+12K+12K+24K
09K+09K+09K+09K+12K/18K/24K
09K+09K+12K+12K+12K/18K/24K
12K+12K+12K+12K+12K/18K
09K+09K+12K+18K+18K
12K+12K+12K+18K+18K
18K+24K
18K+18K
24K+24K
18K+24K
9K+9K+9K
9K+9K+18K
12K+12K+12K 09K+12K+24K 09K+09K+12K+18K
* When the rated total capacity of all the indoor units exceeds the rated capacity of outdoor unit, each indoor unit may not output the rated
capacity and one may differ from other, upon other installation/operation factors, it all units are turned on to run compressor simultaneously.
* Must follow pipe length and refrigerant charge adjustment as instructed in below table:
PIPE ADAPTOR
Whenever the outdoor unit gas valve of size 3/8" is to connect with indoor unit gas pipe of 1/2" or 5/8",
one 3/8" - 1/2" or 3/8" - 5/8" adaptor is to be used in between. This reducer is packed separately and
shall be installed at job site. PIPE ADAPTOR
PIPE FROM
INDOOR UNIT
OUTDOOR UNIT VALVE
OUTDOOR UNIT WORKING TEMPERATURE RANGE

INSTALLATION
INSTUCTIONS
1) Mounting Indoor & Outdoor
Units and Running
Piping/Wiring
Ruler (Not Shown)
Stud-Finder
Dry-Wall Saw
Electric Drill
3" Hole Saw
Drill Extension
Hammer Drill and Bit (Not Shown)
Measuring Tape
Level
Flash Light
Screw Driver (Phillps and Flat)
Hammer
Knife
Scissors
Goggled Glass
Mask
Gloves
Ladder
2) Refrigeration Related Work
RECOMMENDED TOOLS FOR INSTALLATION
3) Electrical Related Installation
Wire Cutter
Wire Stripper
Sharp Plier
Cable Ties
Black Tape for Electrical Use
lectrical Meter
Clamp Meter (Not Shown)
Manifold
Infra Thermometer (Not Shown)
4) Trial Running Units and
Inspection
Individual Wrentch Set (Use Two at
One Time)
Flare-Nut Tool Set (Not Shown)
Hex Head Allen Wrentch Sets (Metric
and Imperial)
Brazing Rods and Brazing Torch
Outfit for ACApplication (Not Shown)
Brazing Flux
Nitrogen Cylinder for Positive
Pressure Leakage Check (Not Shown)
Soap Bubble for Positive Pressure
Leakage Check (Not Shown)
Vacuum Pump for Negative Pressure
Leakage Check
Helium Refrigerant Minor Leakage
Check (Not Shown)
Manifold
INSTALLATION
INSTUCTIONS
P16 OF34P15 OF34 YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
INSTALLING OUTDOOR UNIT
LOCATION
Use bolts to secure the unit to a flat, solid floor.
When mounting the unit on a wall or the roof,
make sure the support is firmly secured so that
it cannot move in the event of intense
vibrations or a strong wind.
* Do not install the outdoor unit in pits or air vents.
* Do not install the outdoor unit where it is exposed
to direct sunlight.
INSTALLING THE PIPES
Use suitable connecting pipes and equipment
for the refrigerant R410A.
The refrigerant pipes must not exceed the maximum
lengths given in the technical data table.
Lag all the refrigerant pipes and joints.
Tighten the connections using two wrenches working in opposite directions.
Install the drain fitting and the drain hose (for model with heat pump only)
Condensation is produced and flows from the outdoor unit when the appliance is operating in the heating mode.
In order not to disturb neighbors and to respect the environment, install a drain fitting and a drain hose to
channel the condensate water. Install the drain fitting and rubber washer on the outdoor unit chassis and connect
a drain hose to it as shown in the figure.
After having removed the packaging, check
that the contents are intact and complete. Handling must be done by suitably equipped qualified technical personnel using equipment
that is suitable for the weight of the appliance.
The outdoor unit must always be kept upright.
HANDLING
INSTALLATION CLEARANCE
8" or above
Space to the cover
78" or above
(Air outlet side) 10" or above
Space to the wall
20" or above
Space to the wall
6" or above
(Air inlet side)
WH

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P18 OF34P17 OF34 YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
INSTALLATION POSITIONS FOR OUTDOOR UNIT
* To be installed at the position where the air delivered from the unit can reach every comer of the room.
* To avoid being affected by the outdoor air.
* To avoid blockage to the air inlet or outlet of the unit.
* To avoid too much oil smoke or steam.
* To avoid possible generation, inflow, lingering or leakage of flammable gases.
* To avoid high-frequency facilities (such as high frequency arc welders, etc.).
* To avoid the places where acid solutions are frequently used.
* To avoid the places where some special sprayers (sulfides) are frequently used.
* Not to install on top of the musical instruments, TV, computer etc. valuable appliance.
* Not to install a fire alarming device near the air outlet of the unit (during operation, the fire alarm device might
be erroneously triggered by the warm air from the unit).
The installation must be done by trained and
qualified service personnel with reliability
according to this manual.
Contact service center if you have any
questions, be for or during or after installation,
in order to avoid the malfunction or failure due
to unprofessional installation.
Picking up and moving the units, you must be
guided by trained and qualified personal, with
proper tool.
Ensure that the recommended clearance is left
around the unit, for proper installation,
operation and service in the future..
WMMS-42CH-V2B(59)(2) (1 to 4)
WMMS-21CH-V2B(59)(2) (1 to 2)
WMMS-30CH-V2B(59)(2) (1 to 2) WMMS-48CH-V2B(59)(2) (1 to 4)
WMMS-24CH-V2B(59)(2) (1 to 3)
WMMS-36CH-V2B(59)(2) (1 to 3)
Inch
Model
B
EInch 13.5
21.7
13.5
22.75
13.5
22.75
13.5
22.5
INSTALLATION CLEARANCE
WMMS-60CH-V2B(59)(2) (1 to 5)
16.9
24.75
>18"
>18"
Other Brackets Heavy-Duty PVC Riser
for Ground Mounting
Coated Brackets
W A ccessories Bracket Accessories
INSTALLATION-OUTDOOR UNIT
INSTALL OUTDOOR UNIT
Strongly suggest to install the outdoor unit above the ground either on platform or brackets as shown below.
Heat pump unit must be lift up from ground level, since condensate must be drained out of the drain pan of the
condensing unit; othewise, condensate may be iced and built up to damage the condensing unit.
Suggest to use YMGI-provided brackets and condensate drainage fitting accessories.
(Actual unit/parts or installation may look differently from the illustrated)
PIPING AND WIRING SIZES-UNITS MADE AFTER 09/2012
Unit Connection Copper
Pipe Sizes Min/Max.Length +/- Elevation Wires from Outdoor to Each Indoor Unit Mini. Wire Size from Outdoor to Circuit Breaker HVAC Type
Circuit Breaker
21/30CH 2*(1/4+3/8") 15/75/25/35 N(1)/2/3/G 12AWG 30AMP
24/36CH 3*(1/4+3/8") 15/75/25/35 N(1)/2/3/G 10AWG
42CH
48CH
60CH
4*(1/4+3/8") 15/75/25/35 N(1)/2/3/G 10AWG
4*(1/4+3/8")
2*(1/4+3/8")+2*(1/4+1/2")
+(1/4+5/8")
15/75/25/35
15/75/25/35
N(1)/2/3/G
N(1)/2/3/G
8AWG
8AWG
30AMP
40AMP
40AMP
50AMP
Disconnect switch box for outdoor unit
Non-Metalic Power Whip
for Outdoor Use
(Field-Supplied, Not Spliced
and Not Knotted,
Water-Proof Sealed Tight,
UL Approved)
Bring in line-voltage power input
wires from circuit breaker to line-
voltage wire terminal block at outdoor
unit. Pass through certified wire pipes,
harnesses and knockouts. Enough
length shall be left for future service.
Only copper wire is allowed.
Strictly follow NEC or state or local
codes to select wires, circuit breaker,
conduits and to perform installation
work.
INSTALLATION & PICTURES-WALL MOUNT BRACKET FOR OUTDOOR UNIT(S)
(PART VARIES UPON MODELS/AVAILABILITY)
* Select a secured location where the outdoor unit will be installed properly.
* Orient the unit rear side (intake grill) towards wall and front side (discharge grill) away from wall.
* For ground installation, use factory-provided riser and accessories. Not to bolt unit feet directly onto ground.
Riser or brackets shall be levelled at outdoor unit foot surfaces. Secure unit foot by tightening bolts, nuts and
anti-vibration pads.
* For wall mount installation, use factory-provided brackets, anchors and accessories.
* Remove the wiring diagram cover where also the
handle for moving unit is located.
* Follow the wiring diagrams on the unit or the wiring
diagram manual that comes with the indoor unit to
get familiar with wiring and make sure nothing is
made wrong. If there is any discrepancy, always use
the one put in the units.
* Connect wires between indoor unit and outdoor
unit-power wire from outdoor to Indoor, control wires
from Indoor unit to outdoor unit. Pass wire through
certified wire pipes, harnesses and knockouts.
Enough length shall be left for future service. Only
copper wire is allowed.
CONNECT WIRING BETWEEN OUTDOOR UNIT AND INDOOR UNIT
OUTDOOR WIRING: OUTDOOR-INDOOR UNIT & DISCONNECT SWITCH
BOX/CIRCUIT BREAKER/FUSE
WIRING OUTDOOR UNIT
* Check the nameplate for rated electrical data. Connect unit to the correct electrical power source.
OO
* Select power wire of proper type and size. Suggest to use UL approved 105 C/221 F multi-strand copper wire
for outdoor use. Refer to the following tables, for proper selection of wire gauge, size and circuit breaker.
WIRING OUTDOOR UNIT
INSTALLATION-OUTDOOR UNIT

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P20 OF34P19 OF34 YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
ELECTRICAL CONNECTIONS
1) Remove the handle at the right side plate of the outdoor unit (one screw).
2) Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and
fix the connection. The fitting line distributing must be consistent with the indoor unit.
terminal of line bank. Wiring should meet that of indoor unit.
3) Fix power connection wire by wire clamp.
4) Ensure wire has been fastened well.
5) Replace handle when done.
An all-pole disconnection switch having a
contact separation of at least 1/10" all poles
should be connected in with wires that are
secured to the unit meta structure.
Wrong wire connection may cause malfunction
of some electric components. After fixing cable,
ensure that leads between connection to fixed
point are well separated..
The connection pipes and the connectiong
wiring of the unit Aand unit B must be
corresponding to each other respectively.
The system shall be installed in accordance
with NEC.
WMMS-21CH-V2B(59)(2) (1 to 2) / WMMS-30CH-V2B(59)(2) (1 to 2)
Handle
Indoor Unit B Indoor Unit A
3
2
N(1)
Interconnection
cable
3
2
N(1)
Interconnection
cable
L2
L1
Incoming Power
208~230/1/60
Power cord
N(1) 23
N(1) 23
B A
N(1) 23
N(1) 23
Outdoor unit
Indoor unit B A
(Left) (Right)
HEIGHT LIMITS OF INDOOR AND OUTDOOR UNITS
Indoor unit
Outdoor unit
Lift
* Either the indoor unit or the outdoor unit can be higher, but the height difference must comply the stated r
equirements.
* Try to reduce the bending of the piping line as much as possible so as to avoid possible negative impacts upon
the performances of the units.
* Make Oil-trap if elevation drop difference is more than 25", as illustrated below.
Indoor unit
Outdoor unit
Drop Oil-Trap
18 ft
Refrigerant Pipe Min/Max. Length, Rise and Drop Height
1,000 Btu/h
09-12
18-24
30-36
Max. Length (Ft.)
50
75
100
Max. Rise Height (Ft.)
20
25
35
Max. Drop Height (Ft.)
28
35
50
Min. Length (Ft.)
15
15
15
ELECTRICAL CONNECTIONS
1) Disassemble the front side plate on the outdoor unit front side plate.(4pc screw).
3) Fix power connection wire by wire clamp.
4) Ensure wire has been fixed well.
5) Install the front side plate.
2) Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and
fix the connection. The fitting line distributing must be consistent with the indoor unit. terminal of line bank.
wiring should meet that of indoor unit.
Do not install the outdoor unit where it is exposed to sunlight.
An all-pole disconnection switch having a contact separation of at least 0.12" in all pole should be
connected in fixed wiring.
Wrong wire connection may cause malfunction of some electric components. After fixing cable, ensure that
leads between connection to fixed point have some space.
The connection pipes and the connectiong wirings of the unit Aand unit B must be corresponding to each
other respective.
The appliance shall be installed in accordance
with national wiring regulations.
Back side panel
Wiring hole of the outdoor unit
Front side panel
WMMS-24CH-V2B(59)(2) (1 to 3) / WMMS-36CH-V2B(59)(2) (1 to 3)
Indoor Unit C
3
2
N(1) 3
2
N(1) 3
2
N(1) L2
L1
Indoor Unit B Indoor Unit A Incoming Power
208~230/1/60
Power cordInterconnection
cable
Interconnection
cable
Interconnection
cable
(Left) (Right)
N(1) 23
N(1) 23
C B
N(1) 23
N(1) 23
Outdoor unit
Indoor unit
A
N(1) 23
N(1) 23
C B A

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P21 OF34 P22 OF34
ELECTRICAL CONNECTIONS
1) Remove the handle at the right side plate of the outdoor unit (one screw).
2) Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and
fix the connection. The fitting line distributing must be consistent with the indoor unit. terminal of line bank.
Wiring should meet that of indoor unit.
3) Fix power connection wire by wire clamp.
4) Ensure wire has been fixed well.
5) Install the handle.
An all-pole disconnection switch having a contact separation of at least 0.12" in all pole should be
connected in fixed wiring.
Wrong wire connection may cause malfunction of some electric components. After fixing cable, ensure that
leads between connection to fixed point have some space.
The connection pipes and the connectiong wiring of the unit A,unit B and unit C must be corresponding to
eachother respective.
The appliance shall be installed in accordance with national wiring regulations.
Do not install the outdoor unit where it is exposed to the sunlight.
Front side plate
WMMS-42CH-V2B(59)(2) (1 to 4) / WMMS-48CH-V2B(59)(2) (1 to 4)
L2
L1
Incoming Power
208~230/1/60
Power cord
3
2
N(1)
Indoor Unit D
Interconnection
cable
3
2
N(1)
Indoor Unit C
Interconnection
cable
3
2
N(1)
Indoor Unit B
Interconnection
cable
3
2
N(1)
Indoor Unit A
Interconnection
cable
N(1) 23
N(1) 23
D C
N(1) 23
N(1) 23
Outdoor unit
Indoor unit
B
N(1) 23
N(1) 23
A
N(1) 23
N(1) 23
D C B A
(Left) (Right)
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
ELECTRICAL CONNECTIONS
1) Remove the handle at the right side plate of the outdoor unit (one screw).
2) Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and
fix the connection. The fitting line distributing must be consistent with the indoor unit. terminal of line bank.
Wiring should meet that of indoor unit.
3) Fix power connection wire by wire clamp.
4) Ensure wire has been fixed well.
5) Install the handle.
An all-pole disconnection switch having a contact separation of at least 0.12" in all pole should be
connected in fixed wiring.
Wrong wire connection may cause malfunction of some electric components. After fixing cable, ensure that
leads between connection to fixed point have some space.
The connection pipes and the connectiong wiring of the unit A, unit B, unit C and unit D must be
corresponding to eachother respective.
The appliance shall be installed in accordance with national wiring regulations.
Do not install the outdoor unit where it is exposed to the sunlight.
L2
L1
Incoming Power
208~230/1/60
Power cord
3
2
N(1)
Indoor Unit D
Interconnection
cable
3
2
N(1)
Indoor Unit C
Interconnection
cable
3
2
N(1)
Indoor Unit B
Interconnection
cable
3
2
N(1)
Indoor Unit A
Interconnection
cable
N(1) 23
N(1) 23
E C
N(1) 23
N(1) 23
Outdoor unit
Indoor unit
B
N(1) 23
N(1) 23
Front side plate
A
N(1) 23
N(1) 23
E C B A
(Left) (Right)
WMMS-60CH-V2B(59)(2) (1 to 5)
3
2
N(1)
Indoor Unit E
Interconnection
cable
D
N(1) 23
N(1) 23
D

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P23 OF34 P24 OF34
WIRING DIAGRAMS
L1
WHBN BU YE
AC-L1 AC-L1 AC-N1 AC-N3 AC-L3
AC-N1
PR N
XH-3
17BK 18RD
W35
X5
X3
X4
AP3
UV W
21YE 22BU 23WH
SC(T)
W34
W33
X101
X12
OVERLOAD
19WH
20WH
R
S1 M2
COMP.
24YEGN
P N
AP2
15BN
16BN
14YEGN
E
X14 LAC
NAC
X13(COM-B)
X18(COM-A)
AC-L
AC-N
10GY
11BK
4BN
6BU
13YEGN
E
FA FB
4V
X25 4V
24
13
FILTER
E
TUBE ROOM EXHAUST
X28
BKWH
RT5 RT4 RT3
OUT TUBE
TEM. SENSOR OUT TUBE TEM. SENSOR OUT TUBE TEM. SENSOR
OUTDOOR UNIT
BN: BROWN
BU: BLUE
BK: BLACK
WH: WHITE
YE: YELLOW
RD: RED GY: GRAY
YEGN: YELLOW GREEN
CN101
FA CN102 FB
BU
BK
BN BN
WH
YEGN
E
FAN MOTOR
C1
X25 FAN-H FAN-L
AP1
M1
FILTER
C1 FU1 XTB XTA XT1
AP1
AP2
AP3
A B
C
B
C
A
ELECTRICAL BOX
1BN FU1 2BN
3BU
7BU
5BN
8BU
9BN
XTB
N(1)
2
3
XTA
2
3
N(1)
E
INDOOR UNIT B INDOOR UNIT A
EXT1
L1
L2
E
12YEGN
L1 L2
POWER
Val.
MOTOR Val. MOTOR
WHEN THE UNIT IS RUNNING OR STOPED WITHIN 2
MINUTES, OR THE VOLTAGE LESS THAN 30V BETWEEN
P AND N OF IPM, DON'T TOUCHANY TERMINAL, IN
ORDER TO AVOID ANY ELECTRICAL SHOCK HAZARD.
WARNING
WARNING
L
BN WH
BL YE
AC-L1 AC-N1 AC-N3 AC-L3
27RD
36RD
PR N
26BK
35BK
W38
W37
X5
X3
X4
UV W
P N
W39
AP2
AP3
AP4
PR N
AC-L1
AC-N1 XH-3
20BN
21BU
X6
X1
X101
X12
X14
19YEGN
E
X10(AC-L)
X9(AC-N)
A(BK)
B(GY) CN2
C(WH)
AP1 31YE 32BU 33WH
S(W) C(T)
29WH 30WH S1 R
COMP.
X4
X2
HEAT-C
EXHAUST
X28
ROOMTUBE
WH BK
RT5 RT4 RT3
OUT TUBE
TEM. SENSOR OUT TUBE TEM. SENSOR OUT TUBE TEM. SENSOR
22RD
23WH
COMP
HEATER
M2 34YEGN
OVERLOAD
OUTDOOR UNIT
BN: BROWN
BU: BLUE
BK: BLACK
GY: GRAY
WH: WHITE
YE: YELLOW
RD: RED
YEGN: YELLOW GREEN
18YEGN E
E
P(1) P'(3)
FILTER
N(2) N'(4)
16BN
17BU
14BN
15BN FU 28BN
10BK
11GY
12WH
1BN
2BN
3BN
5BU
6BU
7BU
POWER XT1
L1
L2
9YEGN
N(1)
2
3
L1
L2
N(1)
2
3
N(1)
2
3
XTA
XTB
XTC
E
INDOOR UNIT A INDOOR UNIT B INDOOR UNIT C
2V 4V
BUBU VT VT
X5
2V X25 X3
4V
FA FB FC
FA FB FC
Val.
MOTOR Val. MOTOR
Val.
MOTOR
24YE 25BU
S2
X20 X29
OVC AC-N
FAN-M
X8 X2 FAN-H FAN-L
X7 X11
40YE 41WH 42BN 43BN 44BK 45BU
534012
E
YEGN
FAN MOTOR
X1
C1
M1
ELECTRICAL BOX
A
B
B
A
L
AP4
AP2
AP3 AP1 FU
C1 FILTER
XTC XTB XTA XT1
AP1: Main Board; AP2: PFC Module;
AP3: Drive Board; AP4: Power Module;
WHEN THE UNIT IS RUNNING OR STOPED WITHIN 2
MINUTES, OR THE VOLTAGE LESS THAN 30V BETWEEN
P AND N OF IPM, DON'T TOUCHANY TERMINAL, IN
ORDER TO AVOID ANY ELECTRICAL SHOCK HAZARD.
WMMS-21CH-V2B(59)(2) (1 to 2) / WMMS-30CH-V2B(59)(2) (1 to 2)
WMMS-24CH-V2B(59)(2) (1 to 3) / WMMS-36CH-V2B(59)(2) (1 to 3)
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
WIRING DIAGRAMS
WARNING
L
BN WH
BL YE
AC-L1 AC-N1 AC-N3 AC-L3
27RD
36RD
PR N
26BK
35BK
W38
W37
X5
X3
X4
UV W
P N
W39
AP2
AP3
AP4
PR N
AC-L1
AC-N1 XH-3
20BN
21BU
X6
X1
X101
X12
X14
19YEGN
E
X10(AC-L)
X9(AC-N)
A(BK)
B(GY) CN2
C(WH)
AP1 31YE 32BU 33WH
S(W) C(T)
29WH 30WH S1 R
COMP.
X4
X2
HEAT-C
EXHAUST
X28
ROOMTUBE
WH BK
RT5 RT4 RT3
OUT TUBE
TEM. SENSOR OUT TUBE TEM. SENSOR OUT TUBE TEM. SENSOR
22RD
23WH
COMP
HEATER
M2 34YEGN
OVERLOAD
OUTDOOR UNIT
BN: BROWN
BU: BLUE
BK: BLACK
GY: GRAY
WH: WHITE
YE: YELLOW
RD: RED
YEGN: YELLOW GREEN
18YEGN E
E
P(1) P'(3)
FILTER
N(2) N'(4)
16BN
17BU
14BN
15BN FU 28BN
10BK
11GY
12WH
1BN
2BN
3BN
5BU
6BU
7BU
POWER XT1
L1
L2
9YEGN
N(1)
2
3
L1
L2
N(1)
2
3
N(1)
2
3
XTA
XTB
XTC
E
INDOOR UNIT A
2V 4V
BUBU VT VT
X5
2V X25 X3
4V
FA FB FC
FA FB FC
Val.
MOTOR Val. MOTOR
Val.
MOTOR
24YE 25BU
S2
X20 X29
OVC AC-N
FAN-M
X8 X2 FAN-H FAN-L
X7 X11
40YE 41WH 42BN 43BN 44BK 45BU
534012
E
YEGN
FAN MOTOR
X1
C1
M1
ELECTRICAL BOX
A
B
B
A
L
AP4
AP2
AP3 AP1 FU
C1 FILTER
XTC XTB XTA XT1
AP1: Main Board; AP2: PFC Module;
AP3: Drive Board; AP4: Power Module;
XTD
FD
FD
Val.
MOTOR
D(RD)
13RD
8BU
9BU
N(1)
2
3
XTD
4BN
5BN
E
WHEN THE UNIT IS RUNNING OR STOPED WITHIN 2
MINUTES, OR THE VOLTAGE LESS THAN 30V BETWEEN
P AND N OF IPM, DON'T TOUCHANY TERMINAL, IN
ORDER TO AVOID ANY ELECTRICAL SHOCK HAZARD.
14BR
WARNING
L
BN WH
BL YE
AC-L1 AC-N1 AC-N3 AC-L3
27RD
36RD
PR N
26BK
35BK
W38
W37
X5
X3
X4
UV W
P N
W39
AP2
AP3
AP4
PR N
AC-L1
AC-N1 XH-3
20BN
21BU
X6
X1
X101
X12
X14
19YEGN
E
X10(AC-L)
X9(AC-N)
A(BK)
B(GY) CN2
C(WH)
AP1 31YE 32BU 33WH
S(W) C(T)
29WH 30WH S1 R
COMP.
X4
X2
HEAT-C
EXHAUST
X28
ROOMTUBE
WH BK
RT5 RT4 RT3
OUT TUBE
TEM. SENSOR OUT TUBE TEM. SENSOR OUT TUBE TEM. SENSOR
22RD
23WH
COMP
HEATER
M2 34YEGN
OVERLOAD
OUTDOOR UNIT
BN: BROWN
BU: BLUE
BK: BLACK
GY: GRAY
WH: WHITE
YE: YELLOW
RD: RED
YEGN: YELLOW GREEN
18YEGN E
E
P(1) P'(3)
FILTER
N(2) N'(4)
16BN
17BU
14BN
15BN FU 28BN
10BK
11GY
12WH
1BN
2BN
3BN
5BU
6BU
7BU
POWER XT1
L1
L2
9YEGN
N(1)
2
3
L1
L2
N(1)
2
3
N(1)
2
3
XTA
XTB
XTC
E
INDOOR UNIT A INDOOR UNIT B INDOOR UNIT C
2V 4V
BUBU VT VT
X5
2V X25 X3
4V
FA FB FC
FA FB FC
Val.
MOTOR Val.
MOTOR
Val.
MOTOR
24YE 25BU
S2
X20 X29
OVC AC-N
FAN-M
X8 X2 FAN-H FAN-L
X7 X11
40YE 41WH 42BN 43BN 44BK 45BU
534012
E
YEGN
FAN MOTOR
X1
C1
M1
ELECTRICAL BOX
A
B
B
A
L
AP4
AP2
AP3 AP1 FU
C1 FILTER
XTC XTB XTA XT1
AP1: Main Board; AP2: PFC Module;
AP3: Drive Board; AP4: Power Module;
XTD
FD
FD
Val.
MOTOR
D(RD)
13RD
8BU
N(1)
2
3
XTD
INDOOR UNIT D
4BN
E
WHEN THE UNIT IS RUNNING OR STOPED WITHIN 2
MINUTES, OR THE VOLTAGE LESS THAN 30V BETWEEN
P AND N OF IPM, DON'T TOUCHANY TERMINAL, IN
ORDER TO AVOID ANY ELECTRICAL SHOCK HAZARD.
WMMS-42CH-V2B(59)(2) (1 to 4) / WMMS-48CH-V2B(59)(2) (1 to 4)
WMMS-60CH-V2B(59)(2) (1 to 5)
E(BR)
N(1)
2
3
XTD
INDOOR UNIT B INDOOR UNIT C INDOOR UNIT D INDOOR UNIT E

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P25 OF34 P26 OF34
NOT TO CROSS-WIRING & NOT TO CROSS-PIPING
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
INLTS STRT
COUP COUP-H OFST O
ELBF90 O ELBF45
SOFT
TEE ENDF RDER
INSTALLATION OF ACCESSORIES
CONNECT REFRIGERANT PIPES
* Use factory-recommended components, as briefly
illustrated below.
* Cover line set in a sequence, either from indoor to
outdoor, or the other way.
* Secure line set covers onto the wall using factory-
recommended accessories.
Not to damage line sets.
Seal Copper Line Set/Wire Cable/Drain
Hose Line Combination:
LINE SET COVERS
OUTDOOR UNIT FOOT RISER OR BRACKETS
A
B
Model
BRKT-0918-SC1
BRKT-1860-SC1
A B LBs Btu/h
CapacitySize(Inch)
17.7
21.7 15.4
18.3 320 360 09K-18K
18K-60K
* Made of stainless steel.
Model
BRKT-0918-ST1
BRKT-1860-ST1
A B LBs Btu/h
CapacitySize(Inch)
17.7
21.7 15.4
18.3 320 360 09K-18K
18K-60K
A
B
C
D
Model
RIST-0918-PVC
RIST-1860-PVC
A B C LBs Btu/h
CapacitySize(Inch)
14.2
17.7 3.7 3.1
3.7 3.1 220
260 09K-18K 18K-60K
D
4.1
4.1
A
B
RIST-XXXX-PVC
Foot Riser
Accessories: End Caps (Optional)
* Shock-proof PVC, Weatherproof & UV resistant.
* Supplied with fastening screws and anchor bolts.
* Easy to install.
* The "honeycomb" structure acts as an anti-vibration
& humming absorption for a quite operation.
* Made of steel.
* Coated with weatherproof polyester powder.
BRKT-XXXX-SC1
BRKT-XXXX-ST1
NOT TO CROSS-WIRING & NOT TO CROSS-PIPING
Indoor Unit E
1/4" 3/8"
Indoor Unit D
1/4" 3/8"
Indoor Unit C
1/4" 1/2"
Indoor Unit B
1/4" 1/2"
Indoor Unit A
1/4" 5/8"
Service Valves
for All
Indoor Units
Adaptors for
outdoor valve
or indoor
connections,
if needed.
Not to cross-wiring, Not to
cross-wiring between any 2+ zones.

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P27 OF34 P28 OF34
VACUUM AND LEAKAGE CHECK
Evacuate the pipes between indoor and outdoor units, using vacuum pump and manifold/gauge set, to a
minimum of 500 microns (service valves remain front seated). Hold for 30 minutes to check if the vacuum level is
maintained. Using dry nitrogen or other leakage detection tool for leak checking. Be certain there is no pressure
in the system when repairing a leak.
Vacuum and Check Leakage before Releasing Refrigerant from Outdoor Unit to Indoor Unit
VACUUM REFRIGERANT PIPES
Service valve
Hexagon
Allen wrench
VACUUM
Humid air left inside the refrigerant circuit can
cause compressor malfunction and failure.
After having connected the indoor and outdoor
units, the air and humidity from the refrigerant
circuit using a vacuum pump.
1) Unscrew and remove the caps from the
2-way and 3-way valves.
2) Unscrew and remove the cap from the
service valve.
3) Connect the vacuum pump hose to the
service valve.
4) Operate the vacuum pump for 10-15
minutes until an absolute vacuum of 500
micron has been reached.
5) With the vacuum pump still in operation,
close the low-pressure knob on the vacuum
pump coupling.
Stop the vacuum pump.
6) Open the 2-way valve by 1/4 turn and then
close it after 10 seconds. Check all the
joints for leaks using liquid soap or an
electronic leak device.
7) Turn the body of the 2-way and 3-way
valves. Disconnect the vacuum pump hose.
8) Replace and tighten all the caps on the
valves.
Vacuum pump
INDOOR UNIT
Refrigerant fluid direction of flow
3-way valve
Service
inlet
(2) Turn
(8) Secure Valve cap
(7) Turn to open fully
(2) Turn
(8) Secure Connect to the
indoor unit
(8) Secure
(2) Turn
2-way valve
(6) Open by 1/4 turn
(7) Turn to open
fullyValve cap
3-way valve
Blank cap
Refrigerant pipe
Outdoor unit
Cap
Service hose
with valve core
Compound pressure gauge
Gauge manifold
Pressure gauge
High pressure
side valve
(closed)
Service hose
Vacuum pump
Service hose
Low pressure
side valve
-100 kPa
-76cm.Hg
-1 bar
(For a description of how to use the
gauge manifold, refer to the gauge
manifold operation manual.)
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
RELEASE REFRIGERANT FROM OUTDOOR TO THE INDOOR UNIT
Unit is pre-charged with refrigerant good for 25' of
connection tubes. If vacuum is held for about 30
minutes and no leak is found, first back-seat the
liquid (smaller) service valve by Allen Wrench (hex
head) slowly to release pre-charged refrigerant from
the condensing unit into the connection pipes and
indoor unit. If no abnormal things are found, fully
open liquid (smaller) and gas (bigger) service
valves. Always replace and tighten the caps onto
service valves. Releasing Refrigerant from Outdoor Unit to Connected
Pipes and Indoor Unit
SYSTEM INSPECTION AND TRIAL RUNNING
CHECK SYSTEM THOROUGHLY
Check system thoroughly to make sure the unit is ready for trial running: check wires and pipes and air intake and discharge
and power and thermostat and others necessary components.
liquid
connecting
pipe
liquid closing valve
gas conne-
cting pipe
screw cap
gas
charging
hole
screw cap
allen wrench
ADJUST REFRIGERANT-GUIDELINE
Right amount of refrigerant is very important. It is one of the basics to ensure unit a safe operation over time.
Normally single zone outdoor unit is pre-charged with refrigerant for 25ft inter-connecting copper (liquid) line. Multiple zone outdoor unit is
pre-charged for various length of copper (liquid) lines of allowed quantity of indoor units, following specs. or engineering submittal.
For single zone unit or multiple zone multiple compressor unit, normally the outdoor unit is pre-charged for 25ft line sets. If the copper line is
longer or shorter than 25ft, need to add or deduct refrigerant, following general rule of thumb for rough adjustment:
1/4" liquid line unit: 0.3 Oz/ft; 3/8" liquid line unit: 0.4 OZ/ft; 1/2" liquid line unit: 1.2 OZ/ft.
For multiple zone one compressor unit, if the copper line is longer or shorter than the length at which pre-charged refrigerant is good for, as
listed in the engineering submittal or related labels or tables, need to add or deduct refrigerant, following 0.23 OZ/ft rule of thumb for rough
adjustment.
In all situations, the minimum copper line (liquid or gas) length for each indoor unit is 15ft.
For a better adjustment, may combine above guideline with the indoor or outdoor (ambient) temperature-refrigerant pressure chart, or
generally 8-12F super-heat method.
Model
Liquid valve In. 1/4 1/4 1/4 1/41/4 1/4 1/41/4 1/41/4 1/4 1/4 1/4
Gas valve 3/8 3/8 3/8 3/83/8 3/8 3/8 3/83/8 3/8 3/8 3/8 3/8
Max. pipe length (add up length of all liquid lines only), if not upper sizing pipes 120 200 230 260
Max. installed indoor and
outdoor unit elevation difference Outdoor unit is installed below the indoor unit Ft. 15 25 30 30
Outdoor unit is installed above indoor unit Ft. 25 25 30 30
Max. pipe length, if not adjusting factory pre-charged refrigerant Ft. 100 (add up length of all liquid lines only) 130 (add up length of all liquid lines only)
Minimum pipe length (for each indoor unit) /15ft
Refrigerant charge adjustment, if actual length is different from the number in the line above +- Oz/Ft 0.23
In.
Ft.
* Adjust refrigerant charge, following instructions, if the actual installation elevation difference is different from 7'
and length is different from the listed numbers above.
* Any indoor unit is 30' or more apart from the outdoor unit, better to adjust refrigerant. If it is 50' or more apart,
better to upper size the copper lines and adjust refrigerant.
* Any run can not be more than 100' apart from the outdoor unit; otherwise, that indoor unit 's capacity may be
decreased too much.
Valve sizes at outdoor unit
60 (add up length of all liquid lines only) 100 (add up length of all liquid lines only)
WMMS-21CH-V2B(59)(2)
WMMS-30CH-V2B(59)(2) WMMS-24CH-V2B(59)(2)
WMMS-36CH-V2B(59)(2) WMMS-42CH-V2B(59)(2) WMMS-48CH-V2B(59)(2) WMMS-60CH-V2B(59)(2)
1/41/4 1/4 1/4
3/8 3/8 1/2 1/2
300
30
30
130 (add up length of all liquid lines only)
1/4
5/8

INSTALLATION
INSTUCTIONS
INSTALLATION
INSTUCTIONS
P29 OF34 P30 OF34
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !
SYSTEM INSPECTION AND TRIAL RUNNING CHECK AFTER INSTALLATION AND TEST OPERATION
1. Before test operation
(1) Do not turn on power before installation is finished completely.
(2) Electric wires must be connected correctly and securely.
(3) Cut-off valves of the connection pipes should be back seated/tunned on.
(4) All the impurities such as scraps and thrums must be cleared out of the unit.
2. Test operation method
(1) Switch on power, press "ON/OFF" button on the wireless remote control to start the operation
(2) Press MODE button, to select the COOL, HEAT (not available for cooling only unit is ), FAN and so on to check :
* All the functions (to make sure the unit functions correctly and poroenty).
* Refrigerant (pressures/temperatures at sericea values/pipes should be good).
* Drainage (condensate/water flow should be dripping out of drainage pipe ONLY).
* Noise (there should be no abnormal symbol)
Has the been unit positioned firmly? The unit may drop, shake or emit noise.
Have you done the refrigerant leakage test? It may cause insufficient cooling(heating)
capacity.
Is heat insulation sufficient? It may cause unexpected condensate and
dripping.
Is drainage pipe tested ? It may cause leakage or unexpect dripping.
Is the voltage in accordance with the rated
voltage marked on the nameplate? It may cause electric malfunction
or damage to the part/unit.
Is the electric wiring and piping
connection installed correctly and securely? It may cause electric malfunction
or damage to the part/unit.
Has the unit been connected to a secure
earth connection? It may cause electrical leakage.
Is the power cord specified properly per
NEC codes ? It may cause electric malfunction
or damage to the part/unit.
Is the air inlet and outlet been cleared? It may cause insufficient cooling(heating)
capacity, and unexpected noise.
Items to be checked
CHECK AFTER INSTALLATION
TEST OPERATION
1) Put back all covers, screws removed during
installation and start-up.
2) Properly note, mark, organize and secure wires.
3) Caulk the opening to weatherproof level at
opening frame both inside and outside.
4) Do a final visual inspection.
5) Teach or instruct owner or users how to correctly
operate the system and answer their questions.
6) Check against all items in Product/Warranty
Registration Card and sign it for the owner.
FINISH INSTALLATION
liquid piep gas pipe
drain hose
adiabatic underlay
felt
Has the refrigerant pressure been checked or refrigerant
been adjusted accordingly? It may generate unexpected noise, freezing pipe, capacity issues, compressor or system damage or even worse.
Has the installing technician filled all the fields in the
checklist inside the warranty registration card? If not filed or not filled completely or correctly, your factory warranty may not be qualified.
Possible Problems or Consequences
PRESSURE TABLES
Warning: R410A refrigerant bears higher pressures than R22.
Only handled by Licensed HVAC technician.
Outdoor Dry-Bulb (F)
Outdoor Dry-Bulb (C)
Outdoor Wet-Bulb (F)
Outdoor Wet-Bulb (C)
Indoor Dry-Bulb
Indoor Wet-Bulb
Discharge-PSI/F
Suction-PSI/F
15
-9.4
13.6
-10.2
25
-3.9
23.0
-5
35
1.7
30.2
-1.0
50
10.0
42.8
6.0
55
12.8
46.9
8.3
60
15.6
51.1
10.6
67
19.4
59.5
15.3
75
23.9
66.6
19.2
82
27.8
64.9
18.3
90
32.2
71.2
21.8
95
35.0
75.0
23.9
100
37.8
79.0
26.1
105
40.6
82.9
28.3
110
43.3
86.9
30.5
115
46.1
90.7
32.6
74/21.2 84/27.1 105/35.1 115/38.5 125/42.8 130/45.5 140/48.2 146/51.2 156/54.3 166/57.5 175/61.2 180/62.5 186/63.7 189/64.5 191/64.9
60/46.2 70/53.5 85/55.2 92/55.7 98/56.1 103/56.7 110/56.9 115/57.1 120/57.5 128/57.8 135/57.9 136/58.6 137/59.1 139/59.3 140/59.5
80F (26.7C)
67F (19.4C)
Suggest to Add on Low Ambient Control, If Still
in Need of AC for Long Time In Cold Weather.
Closely Check/Watch Refrigerant Charge Level.
Reference Temperature-Pressure Table (Split Condensing Unit-R410A AC)
Product Series: YMGI Group-Mini Split Version: 01/11/2010
Reference Temperature-Pressure Table (Split Condensing Unit, R410A-Heat Pump)
Product Series: YMGI Group-Mini Split System Version: 01/11/2010
Outdoor Dry-Bulb (F)
Outdoor Dry-Bulb (C)
Outdoor Wet-Bulb (F)
Outdoor Wet-Bulb (C)
Indoor Dry-Bulb
Indoor Wet-Bulb
Discharge-PSI/F
Suction-PSI/F
0
-17.8
-0.8
-18.2
5
-15
4.1
-15.5
10
-12.2
8.8
-12.9
17
-8.3
15
-9.4
25
-3.9
22.8
-5.1
30
-1.1
27.5
-2.5
35
1.7
28.9
-1.7
40
4.4
36.3
2.4
45
7.2
41.0
5
47
8.3
43.0
6.1
55
12.8
50.4
10.2
62
16.7
56.5
13.6
70F (21.1C)
60F (15.6C)
260/84 269/90 284.5/95 290/102 296/111 304/128 304/133 330/138 345/142 354/149 400/149 440/176
246/72 255/78 270/86 278/89 285/92 290/95 310/98 318/100 330/102 340/104 380/107 425/113
System pressure checking should be a must-do job during trial running of initial installation, and compressor/refrigerant-related trouble-
shooting. It is a more accurate refrigerant adjusting method than rough refrigerant addition or deduction guideline shown above.
In some cases, if the service valve on unit is 5/16 and your service valve connection is 1/4 , need to use a 5/16 -1/4 adaptor so that
you can connect to your manifold. Need to pay attention to use the right manifold that is rated for the refrigerant in the unit, and pay attention
to connect to the right hose (blue hose for low pressure, red hose for high pressure, yellow hose for vacuum or charging or deduction). Not
recommend to put hose onto service valve while compressor is running. Remove hose quickly and carefully to avoid air suck-in, refrigerant
leakage, or any refrigerant-freezing burn.
The following curves are only reference for system pressure checking. Actual pressures may vary upon many factors such as inter-connecting
pipe length, refrigerant charge / leakage level, elevation difference between indoor unit and outdoor unit, tool calibration, reading error, and so on.

MAINTENANCE &
TROUBLE-SHOOTING
MAINTENANCE &
TROUBLE-SHOOTING
P31 OF34 P32 OF34
Compressor operates Air exhaust protection frequency limitAir exhaust protection frequncy limit
Compressor high pressure protection
unit stop Cooling overload frequncy reducing Cooling overload frequncy limit
Air exhaust protection unit stop Over current protection frequency limit
Over current protection frequency
reducing
Communication malfunction unit stop
(Include indoor unit and driver) Phase current protection frequncy reducing Phase current protection frequncy limit
IPM modular protection unit stop Heating A unit anti-high temperature
frequncy reducing Heating A unit anti-high temperature frequncy limit
Over current protection unit stop Heating B unit anti-high temperature
frequncy reducing Heating B unit anti-high temperature frequncy limit
Cooling overload unit stop Heating C unit anti-high temperature
frequncy reducing Heating C unit anti-high temperature frequncy limit
Each indoor unit starts heating at same time
anti-high temperature protection unit stop Heating D unit anti-high temperature
frequncy reducing Heating D unit anti-high temperature frequncy limit
Each indoor unit anti-freezing protection
at same time unit stop Defrosting Oil return
Outdoor unit temp. sensor malfunction or each
indoor unit temp. sensor malfunction unit stop
Compressor overload protection unit
stop
Compressor low-pressure protection
unit stop (preserved)
Phase current protection unit stop
E2 PROM Error unit stop
DC power supply short circuit
D101 D102 D103
D104 D105 D106
D107 D108 D109
Blink
once Blink once
Twice Twice
Three
times Three times
Blink
once
Twice
Three
times
Four
times
Five
times
Six
times
Seven
times
Eight
times
Nine
times
Ten
times
Eleven
times
Twelve
times
Thirteen
times
Fourteen
times
Fifteen
times
A unit communication malfunction
(cannot receive correct data within 3mins.) B unit communication malfunction (cannot receive correct data within 3mins.)
A unit indoor middle temp. sensor
malfunction B unit indoor middle temp. sensor malfunction
A unit indoor outlet pipe temp. sensor
malfunction B unit indoor outlet pipe temp. sensor malfunction
A unit indoor inlet pipe temp.
sensor malfunction B unit indoor inlet pipe temp. sensor malfunction
A unit indoor ambient temp.
sensor malfunction B unit indoor ambient temp. sensor malfunction
A unit modes conflict B unit modes conflict
A unit anti-freezing protection B unit anti-freezing protection
A unit anti-high temp. protection B unit anti-high temp. protection
Outdoor ambient temp. sensor
malfunction
Outdoor tube temp. sensor malfunction
Outdoor air exhaust temp. sensor
malfunction
Communication malfunction with driver (cannot
receive correct data from driver within 10s)
C unit communication malfunction
(cannot receive correct data within 3mins.) D unit communication malfunction (cannot receive correct data within 3mins.) Received communication data proof
test correct will flash once
C unit indoor middle temp. sensor
malfunction D unit indoor middle temp. sensor
malfunction
C unit indoor outlet pipe temp. sensor
malfunction D unit indoor outlet pipe temp. sensor
malfunction
C unit indoor inlet pipe temp.
sensor malfunction D unit indoor inlet pipe temp.
sensor malfunction
C unit indoor ambient temp.
sensor malfunction D unit indoor ambient temp.
sensor malfunction
C unit modes conflict D unit modes conflict
C unit anti-freezing protection
C unit anti-high temp. protection
D unit anti-freezing protection
D unit anti-high temp. protection
Four
times
Five
times
Six
times
Seven
times
Eight
times
Nine
times
Four
times
Five
times
Six
times
Seven
times
Eight
times
Nine
times
Blink
once Blink once
Blink
once
Twice TwiceTwice
Three
times Three times
Three
times
Four
times Four times Four times
Five
times
Six
times
Seven
times
Eight
times
Five
times
Six
times
Seven
times
Eight
times
Blink
once Blink once
Blink
once
TwiceTwice
Three
times
Three
times
Four
times Four times
Five
times
Six
times
Seven
times
Eight
times
Five
times
Six
times
Seven
times
Eight
times
Meaning
Meaning
Meaning
Meaning
Meaning
Meaning
Meaning
Meaning
Meaning
FAULT INDICATION
MAINTENANCE
Use proper instruments for the refrigerant R410A.
Do not use any refrigerant other than R410A.
Do not clean the unit using mineral oil.
WARRANTY AND TECH. SUPPORT
YMGI warrants to the purchaser/owner(s) that YMGI products be free from defects in material and
workmanship under the normal use and maintenance, with the standard Limited Product Warranty
Policies that comes with the unit or sales package.
YMGI IS NOT RESPONSIBLE FOR
CONTACT FOR FIELD SERVICE OR REPAIR
The following people, in a prioritized sequence, will take care of your request or issue:
1) The original installer; otherwise,
2) Your current service contractor; otherwise,
3) Authorized contractor in YMGI list that is close to you; otherwise,
4) Authorized Distributor in YMGI Distributor list; otherwise,
5) Contractor/Distributor you prefer who is close to you.
CONTACT FOR GENERAL TECHNICAL QUESTIONS OR SUPPORT, IN A SEQUENCE:
1) The original installer; otherwise,
2) The current service contractor; otherwise,
3) The distributor; where the unit is purchased from otherwise,
4) YMGI Technical Support:
Tel: [phone]*703 Email: [email protected]
* Regular equipment maintenance or field service or field inspection.
* Damage or repairs required as a consequence Customer do-it-yoursely(DIY) installation and/or any other faulty
installation or improper application.
* Failure to start due to voltage conditions, blown fuses, open circuit breakers, or other damages due to the
inadequacy or interruption of electrical service.
* Damage or repairs needed as a consequence of any misapplication, abuse, improper servicing, unauthorized
alteration, or improper operation.
* Damage as a result of floods, winds, fires, lightening, accidents, corrosive atmosphere, or other conditions
beyond the control of YMGI.
* Parts not supplied or designated by YMGI.
* Products installed outside USA or Canada.
* Any damages to person or property of whatever kind, direct or indirect, special or consequential, whether
resulting from use or loss of use of the product.
The original licensed installer or current service contractor should be contacted first of all, since they installed
the unit and/or know more details than anybody else.
They will check the unit and find out the problems with the professional knowledge about HVAC and electric
product installation by using special tools or instrument.
They can contact YMGI technical support for technical help during unit installation or inspection.
Product model and serial numbers needed, which can be found on unit nameplate sticker, so that our
technician can quickly identify the unit, parts and wiring diagrams, among our many products and models.
* Any problems due to improper cooling and heating load calcuation of the room/building the air conditioner/heat
pump system is to be installed. Equipment users can get the calculation schedule from your room/building
architect or your installation or related service HVAC contractor, who should have knowledge and tools to do
these calculation correctly.
* Any problems due to improper sizing and selecting air conditioner/heat pump system. These equipment sizing
and selection work should be conducted by either your room/building architect or your installation or related
service HVAC contractor, who should have knowledge and tools to do these calculation correctly, and get your
approval, before your purchasing these air conditioner or heat pump equipment.
* Any problems due to improper installing of the air conditioner/heat pump system. Installation should be
conducted by currently licensed HVAC technician, following manufacturer installation instructions, all governing
safety codes, with care and professionalism.
* Any problems due to improper operation of the air conditioner/heat pump system. Users shall keep the manual
and look up in the manuals for the correct understanding how the unit will work and how to operate the unit
correctly.
* Any problems due to improper maintenance of the air conditioner/heat pump system. Like a car, regular
maintenance or yearly checking is necessary for the unit to work properly for you, before the season comes. For
example, air filter shall be checked for cleaness from time to time. Remote control batteries shall be checked for
enough power, before judging the unit is not working...
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !

WARRANTY INFO. &
CUSTOMER SUPPORT
WARRANTY INFO. &
CUSTOMER SUPPORT
P33 OF34 P34 OF34
SERVICE/MAINTENANCE LOG
Put down whatever questions you have or problems you have seen as a unit history:
No. Date Service/Maintenance Conducted Person/Phone
USER NOTES
Put down whatever questions you have or problems you have seen as a unit history:
No. Date Questions or Problems Remarks
USER NOTES AND SERVICE LOG MEMO
YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !YMGI, Engineered Comfort Products for ASustainable and Efficient Green World !