YMGI 86 Series Manual

YMGI, Engineered Comfort Products for A Sustainable
and Efficient Green World!
INSTALLATION INSTRUCTIONS & USER MANUAL
Wall Mount Mini Split Systems
SYMPHONY SOLAR DC INVERTER SINGLE ZONE (86) Series
09-24k, 24 & 48v DC Solar Powered Cooling and Heat Pump
Model Numbers:
WMMS-09KS-V2D(86)
WMMS-12KS-V2D(86)
WMMS-18KS-V2D(86)
WMMS-24KS-V2D(86)
Thank you for choosing this YMGI product. Please read the owner’s manual carefully before installation and operation and retain for your
records and future reference. If you need a replacement copy, please contact your local agent or visit www.ymgigroup.com to download
a current electronic version.
NOTICE
This product is designed and manufactured to be free from any defects in material and workmanship during normal use and
maintenance. Installation, operation, maintenance and repair must follow all standards and professional practices for regular cooling
and heating equipment, such as NEC, State, or Local Codes and all related documents/manuals provided by YMGI. Failure to follow
and adhere to all codes and documentation can cause damage to equipment, property even personal injury.
Installer: Currently licensed/certified HVAC technicians only. Must Read the manual and all provided documents prior to installation.
Complete and fill out all required information on the warranty registration card.
User: Retain this manual and all supplied documents for your records and future reference.
Servicer: Use this manual for information concerning servicing and maintenance of this product.
SAFETY WARNING
Only qualified technicians should install and service this equipment. The installation, startup, operation and servicing of this equipment
can be hazardous and requires a HVAC professional who has been trained, licensed and certified. Installations, adjustments or any
equipment alterations done by an unqualified person could result in serious injury and even death. When working on the equipment,
observe all precautions in the provided documents, on the tags, stickers, and labels that are attached to or placed on the equipment.

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TABLE OF CONTENTS
Introduction .......................................................................................................................................................... 3
Note From YMGI –Must Read ........................................................................................................................... 5
InstallingTechnician/Contractor'sResponsibilities .................................................................................................... 7
Limited Product Warranty .................................................................................................................................... 8
Limited Product Warranty Registration Card ..................................................................................................... 10
Why Does YMGI Group Require Installation and Service to Be Performed
100% By Currently Licensed or Certified HVAC Technicians/Contractors ....................................................... 11
Suggestions to Aid You in Hiring an HVAC Contractor ..................................................................................... 11
Safety Precautions ............................................................................................................................................. 12
Breif Introduction to Mini Split Wall Mount Systems ...............................................................................................14
System Layout ................................................................................................................................................... 16
Connection of Wires at Indoor and Outdoor Unit .............................................................................................. 18
Engineering Submittals Unit Specifications ....................................................................................................... 20
Engineering Submittals Unit Dimensions .......................................................................................................... 21
Air Conditioner Components ............................................................................................................................. 23
Installation Clearance Requirements ................................................................................................................. 24
Recommended Tools for Installation ................................................................................................................. 26
Installation of Indoor Unit ................................................................................................................................... 30
Installation of Outdoor Unit................................................................................................................................. 33
Installation of PV Module.................................................................................................................................... 34
Wiring Outdoor Unit............................................................................................................................................ 38
Piping Connections ............................................................................................................................................ 43
Accessories Installation...................................................................................................................................... 46
Vacuum Testing and Charging........................................................................................................................... 47
Check after Installation....................................................................................................................................... 50
Remote Control Buttons..................................................................................................................................... 51
Remote Control Functions.................................................................................................................................. 52
Common Faults and Solutions........................................................................................................................... 54
Trouble Shooting and Error Codes..................................................................................................................... 55
Cleaning and Care.............................................................................................................................................. 56
RT Conversion Tables........................................................................................................................................ 60
User Notes and Installation/Service/Maintenance Notes................................................................................... 62

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Introduction
Read this manual carefully, making sure you understand all the instructions, practices and procedures contained in this manual. Be sure
you are familiar with all the safety advisories that appear throughout this manual. Your personal safety depends upon your observance
of all precautions contained in this manual.
Safety advisories appear throughout this manual and your personal safety and the proper operation of this appliance depend upon the
strict observance of these precautions.
The 3 types of advisories are defined in the following table:
Indicates a potentially hazardous situation which if not avoided could result in serious
injury or even death.
Indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury. It could also be used to alert against unsafe practices.
Indicates a situation that could result in equipment or property-damage only. It can also
be used to call attention to important details within this manual.
Important Environmental Concerns
Studies have shown that certain man-made chemicals can affect the earth’s stratospheric ozone layer when released into the
atmosphere. Refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs), may affect the ozone layer. Not all refrigerants have the same potential impact on the environment. YMGI Group
advocates for the responsible handling of all refrigerants including industry replacements for CFCs such as HCFCs and HFCs.
Responsible Refrigerant Practices
YMGI Group believes that responsible refrigerant practices are important to our customers, the HVAC/R industry and the environment.
All HVAC/R technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements
for handling, reclaiming, recovering and recycling of certain refrigerants, the equipment and tools necessary to perform these service
procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible
management of refrigerants. HVAC/R technicians must know the applicable laws and follow them.
Disposal Notice
Do not dispose this product or its components as unsorted municipal waste, as they contain items that may require special treatment.
Contact your local waste management company for details.
Proper Field Wiring and Grounding Required!
Failure to follow established electrical codes can result in death, serious personal injury and property damage. All field wiring MUST be
performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid
these hazards, you MUST follow the requirements for field wiring installation and grounding as described in this manual and by NEC and
your state and local electrical codes.
Personal Protective Equipment (PPE) Required!
Failure to wear proper PPE for the job being undertaken could result in serious injury or even death. Technicians must take the necessary
precautions to protect themselves from potential electrical, mechanical, and chemical hazards and MUST follow all precautions in this
manual and on the tags, stickers, and labels, as well as the instructions below:
•Before installing or servicing this unit, technicians MUST put on all PPE recommended for the work being undertaken. ALWAYS
refer to appropriate Material Safety Data Sheets (MSDS) and Occupational Safety and Health Administration (OSHA) guidelines
for proper PPE.
•When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS sheets and OSHA guidelines for
information on allowable personal exposure levels, proper respiratory protection, and handling recommendations.
If there is a risk of arc or flash, technicians MUST put on all PPE in accordance with NFPA 70E or other country-specific requirements for
arc flash protection, PRIOR to servicing the unit.

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Copyright
This document and the information contained therein are the sole property of YMGI Group and shall not be used or
reproduced in whole or in part, without the written permission of YMGI Group. YMGI Group reserves the right to revise this
manual at any time and to make changes to its content without obligation to notify anyone about any modifications, revisions
or changes.
Instructions for installation and use of this product are provided by the manufacturer.
Installation must be performed by authorized and licensed personnel only and in accordance with all the requirements
of this manual, the NEC, CEC and any state and local codes.
For safe operation of this unit, please read and follow all instructions carefully.
The total operation capacity of the indoor units should not exceed 120% of the total capacity of the outdoor units if all
indoor units must operate at their peak capacities all the time. Otherwise, the heating and cooling operation will be
diminished and less efficient which could damage the units.
Any person responsible for system operation or system maintenance should retain this manual for reference.
If the unit fails to operate normally, please contact your authorized system installer or HVAC professional as soon as
possible and provide the following information:
•Data on the unit (model number, serial number and owner’s name).
•A detailed description of the unit’s problem before and after the problem occurred.
To avoid personal injury or property damage, do not disassemble the unit yourself. If disassembly is required to check
the unit, contact your authorized system installer or HVAC professional as they have the experience and training
necessary to perform this task.
Note: Each unit has been thoroughly tested to ensure it operates correctly before leaving the factory.
Basic Cautions and Warnings
All units shall be installed by an experienced HVAC licensed contractor or technician. Read all manuals before installation,
startup and operation.
All NEC, state, local codes and installation instructions must be followed for all units, otherwise, the unit warranty will be
void and could result in serious damage to people or property.
YMGI Group is not responsible for any damage or loss due to Do-It-Yourself (DIY), self-installation or any improper
installation, improper operation, improper service or natural disasters of any kind.
Do not connect power to the unit until all wiring, tubing and all unit inspections and testing have been completed. Ground
the unit according to the instructions and adhering to NEC, state and local codes.
All wiring connections must be correct and secure. Loose wire(s) or improper contacts may cause arcs or overheating
which can result in a fire hazard.

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Note From YMGI –Must Read
Dear Customers, Purchasers, Installers, and Contractors
Thank you for choosing an YMGI product.
All YMGI's products are fully tested and have passed rigorous safety, performance and manufacturing standards before
being packed and shipped. YMGI only uses suppliers that meet our strict standards for high quality and performance for
all parts. YMGI also recognizes a quality installation is equally important therefore your system must be installed by a
licensed HVAC professional. A quality installation ensures your unit will operate at its highest efficiency and peak
performance for many years of worry free comfort; while a poor installation can result in unit failure and cause the unit to
operate inefficiently, either immediately or over time, resulting in costly repairs.
Because a quality installation is so critical, YMGI provides detailed information in our manuals which will aid the installing
technician and the owner of the unit(s).
At YMGI our goal is to ensure that your YMGI units are installed properly and correctly from the beginning.
The YMGI equipment you purchased is either a split-type or a self-contained cooling/heating system. These types of
systems require a certified and licensed HVAC professional technician for proper installation. Only a certified and licensed
HVAC professional technician will have the knowledge, experience, and attention for all required details to perform a
complete and successful installation. This equipment is different from a window or portable type air conditioners you can
purchase from local retail stores such as Home Depot, Lowe's, Sears, etc. which the manufacturer may not require certified
and licensed personnel to install.
Reading and following YMGI Group recommendations and requirements contained in the following pages and other
documents, is the first step to help ensure a smooth installation and proper operation of your unit for many years.
YMGI doesn't recommend nor allow any do-it-yourself (DIY) installation (partially or fully). Due to the complexity of the
installation of this product most DIY installations usually have problems, either immediate or near future. These problems
can cost more to fix than any upfront savings. YMGI warranty doesn't cover any DIY units.
If you have any questions about your unit or if the unit has a problem, you should first check the manual. If you can’t find a
solution, then contact your local installer or service technician to schedule a service appointment. The technician can
physically inspect the unit. If at the time of inspection, the installer or service technician has any questions about the unit,
they can contact YMGI technical support division directly at:
Toll Free Number: [phone] or Email: [e-mail]
IMPORTANT:
YMGI Group is the MEDIA AUTHORITY:
YMGI Group, located in O'Fallon, MO 63366 is the author of all media produced for its products and is the only party able
to give any additional explanation for any data, definitions and or descriptions found within any of its media, including but
not limited to YMGI product brochures, manuals, pamphlets, catalogs, and videos. YMGI's distributors, installers, dealers,
agents, customers or any other third parties will not supersede YMGI in anyway concerning YMGI-published materials and
their meaning. Any concerns or questions arising from YMGI distributors, installers, dealers, agents, customers or any other
third parties, should be presented directly to YMGI. YMGI will respond to any concerns or questions, if necessary, about
any of its media in writing.

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Be sure to only hire a certified and currently licensed HVAC Company to complete 100% of the installation so that all
details of the installation are performed correctly and completely.
Be sure to have ONLY the licensed HVAC professional perform all aspects of the installation. Factory Warranty will be
void if any portion of the installation is not performed by a licensed HVAC contractor/technician. DIY or partial DIY will
also void ALL factory warranties.
When hiring an HVAC technician that is offering their services as a "side job" and not hiring a licensed HVAC company
may pose possible risk. This may result in an incomplete or unsatisfactory installation, no guarantee for workmanship
and lack of maintenance and further service to your unit.
Have the installation technician read in full the installation manual and all supplied documents for the product model
you purchased. Details within the documentation contributes greatly to the success and quality of the installation.
Experience with other manufacturers may not be applied fully to another manufacturer, although there will be similarities
there will also be differences. Ignoring the provided installation procedures is an act of negligence and may cause unit
failure or damage which could be irrevocable and permanent.
It is possible for a licensed contractor/technician to make a mistake during the installation. YMGI doesn't supervise nor
is able to control the contractor/technician’s installation. It is criticalthat the installer take eachvariable into account
during the initial installation. This will ensure a complete and professional installation and that all units work
properly.
The following will damage the unit and its key components resulting in loss of factory warranty:
1. Any foreign substances introduced into the system because of failure to seal the ends of the refrigeration piping before
pulling the piping through any structures at time of installation.
2. Not installing an oil P-trap in the copper suction line where the indoor unit is located 18 feet or more below the outdoor
unit.
3. Cross piping and/or cross wiring of any units including more than one single zone or a multi zone system.
4. Not conducting a positive leak check by charging the system with dry-nitrogen and performing soap bubble testing.
5. Not conducting a negative leak check by evacuating the copper lines for 30 minutes. Vacuum must be held at 500
microns or better for at least 5 minutes, starting 5-minute timer after the vacuum pump is turned off.
6. Not conducting a positive leak check prior to the negative leak check.
7. Not selecting the correct size wire or circuit breaker.
8. Not answering ALL questions in the technician's checklist located inside the warranty registration form.
The following may be overlooked, ignored, or considered unimportant during your installer's installation, but will
cause your unit to underperform and may cause unit failure.
1. Any kinks in or improper bending of the copper piping.
2. Any poorly formed flares or not centering the flare with the flare nut, or not tightening all connections.
3. Not trial testing each indoor unit individually.
4. Not reading technical data (temp/time/pressure/current) after the system is stabilized (normally the compressor needs
to run at least 10 minutes before reading the data). If the data is read too early may lead to inaccurate assessments
about the unit.
In an effort to help protect our customers from possible faulty installations that can lead to premature unit failure, YMGI
provides the above information for you and the technician. You can observe while your system is being installed, even
though your observation is not a guarantee your system is being or has been installed properly and professionally. With the
information provided above, you will know some things to look for and questions you can ask. If at any time you feel there
may be an issue with the installation, please have your technician contact YMGI at [phone] x 703 with any questions,
issues or concerns you may have.

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INSTALLING TECHNICIAN/CONTRACTOR'S RESPONSIBILITIES
1. Discuss with the customer detailed information about the structure to be conditioned, local weather (typical design, extreme
temperature/humidity conditions, cooling and heating hours), previous and existing HVAC equipment (if any), usage and dependence on
new HVAC equipment or YMGI products.
2. Performing a cooling/heating load calculation by using commercially available professional programs/methods such as Right-J (Manual J)
for residential HVAC applications and Right-CommLoad (ASHRAE RTS/CLTD) for light commercial and commercial HVAC applications.
3. Contact your YMGI distributor/sales department or contact the manufacturer directly to obtain additional information to fully understand your
YMGI products, including but not limited to product features, cooling/heating performance at standard ratings/conditions and extreme
conditions, allowed indoor and outdoor temperature and humidity ranges, installation, operation, maintenance, service, warranty, parts and
any other issues pertaining to YMGI products.
4. Select the correct (most suitable) YMGI product unit models and accessories necessary for your HVAC applications and list them in the
proposal/quote, in writing, on company's quotation form or letter head, based upon the information you collected from 1), 2) and 3).
5. List your currently valid HVAC license number and EPA number in your proposal/quote.
6. Make sure you are the only party to perform the entire installation and you will not sub-contract any part of the installation to any non-licensed
parties or persons. You will be solely responsible for the entire installation that you have been contracted.
7. Make sure you have all the materials you need to properly, completely and correctly finish the installation. The YMGI units and accessories
may be just a portion of what you will need for the project. When support issues arise, remember YMGI employees and YMGI
distributors/sales, dealers and agents are not installers and may only provide suggestions. You are the only decision maker to determine
what other materials you need to complete the installation.
8. When connecting electrical wires, follow all NEC, state and local codes and ensure the installation of all YMGI units and accessories meet
these requirements.
9. Connect the unit to a correctly sized electrical power source. If the unit is installed in an area where lightning or storms occur frequently, a
correctly sized and type of power surge protector must be installed between the outdoor unit and the power source.
10. Select the correct types and sizes of HVAC circuit breakers, disconnect switch boxes, wires and conduit from circuit breaker to disconnect
box and then from disconnect box to outdoor unit.
11. Select the proper location for installing indoor units and outdoor units with all factory requirements being followed (cooling/heating air inlets
and outlets are not blocked or restricted, mounting structure is secure, installation for convenience is considered, allow adequate clearance
for maintenance/service and all applicable codes are met).
12. Cap/tape the two ends of every copper line before running them through any structure to keep any foreign substances from entering the pipe
causing contamination. Label them A-A, B-B, C-C, D-D, or any other identifying marks on each pair of copper lines and wiring cable sets to
keep from cross-piping or cross-wiring in multiple zone installations or where pipes for different single zone systems are close to one another.
13. Secure the wiring cables that connect between the indoor unit and outdoor unit, following all applicable NEC, state and local codes for your
installation. If there is no special NEC, state or local codes to govern how these wires are to be installed, you can tape/cable tie them along
with insulated copper line.
14. Tighten all pipe and wire connections ensuring there is no leakage or false connections.
15. Conduct a positive pressure leakage test, checking each of the inter-connecting copper lines between each indoor unit and outdoor unit by
charging with dry-nitrogen at the outdoor unit’s service port (note: do not back-seat stopping valve). A liquid soap solution shall be applied
at all pipe connections to check for leakage. A 1/4” - 5/16” hose/valve adaptor may be needed if you have a 1/4” traditional manifold hose
connection.
16. If there is no positive leaking, then conduct a negative pressure leakage test, checking all inter-connecting copper lines between each indoor
unit and outdoor unit by pulling vacuum at the outdoor unit’s service port (note: do not back-seat stopping valve) and checking that the
vacuum level of 500 Microns can be held for at least 20 minutes.
17. If there is no leakage found at any of the refrigeration pipe connections, flip up the indoor unit’s face panel and remove filter, carefully pour
some clear water onto the up-right aluminum coil surface to test if the water can drain out of each the indoor unit’s freely without finding any
leakage.
18. If there is water leakage found, locate the source of the leak and correct it. Only after everything is clear, engage the correct electrical power
to the system.
19. Then back-seat stopping valves of the outdoor unit to release refrigerant from the outdoor unit into the inter-connecting pipes and indoor
unit.
20. Make sure both the indoor unit and outdoor unit are powered on correctly, operating the indoor unit in fan mode first. Then move on to test
cooling, dehumidifying/drying, heating and other modes.
21. Read refrigerant pressures and pipe/valve temperatures only after the system is stabilized (normally 10 minutes after cooling/heating mode
is started successfully). Record this data into the technician checklist in the lower half section of the Limited Product Warranty Registration
Card/Form.
22. Adjust refrigerant charging level (remove refrigerant if pipe is shorter, the temperature is colder; add refrigerant if pipe is longer the
temperature is warmer), following the manufacturer's instructions. If the average pipe length is shorter or longer than 25' and
pressure/temperature readings at the outdoor unit service valves are not falling into normal ranges.
23. Explain to the user/owner about proper unit operation and maintenance. Leave your contact information to allow them to reach you. If the
customer finds the unit doesn't work properly and cannot resolve the issue themselves, check the customer's units/parts/accessories and
correct the issue if there is one. Communicate with YMGI-technical support line at [phone] x 703, if further help necessary.
Following these requirements will aid in ensuring that the units to be installed meet general HVAC practicing standards and necessary factory
requirements. Finding any possible problems early, preventing any further damage to the unit will help to ensure a properly working unit for
many years.

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LIMITED PRODUCT WARRANTY
Once the installation and successful testing of the system has been completely performed by a qualified licensed/certified
HVAC technician/contractor, the registration card/form is filled out completely and correctly, and filed along with a valid
installation invoice from the contractor within 7 days of the original installation, the following standard Limited Product
Warranty is qualified: 5-years on the compressor and 1-year on PARTS ONLY. There is no labor coverage.
YMGI products are designed and manufactured free from defects in workmanship, and materials for normal use. However,
if for any reason, including occasionally transporting between YMGI factories/warehouses and your delivery location, you
discover the unit has issues, YMGI Group will help field a solution by following YMGI’s established warranty procedures:
Compressor: YMGI will warrant the compressor of an YMGI-validated and approved warranty filing, for a period of 5 years
from the date of successful installation at its original installation location.
Parts: YMGI will warrant parts of an YMGI-validated and approved warranty filing, for one year from the date of successful
installation at original installation location.
All warranty compressors and parts replaced will become the sole property of YMGI Group and must be returned to YMGI
Group upon request. Warranty parts may be new or refurbished. All parts are tested and approved before shipping.
At no time does YMGI Group warrant labor cost of any type. Warranty will start from the date of successful
installation at original installation location, or 90 days as of original shipping date from YMGI Group, whichever
comes first.
This is a standard limited liability warranty and DOES NOT cover the following:
Any damage or repairs to properties, or persons as an incident of or consequence of improper faulty transportation,
installation, operation, maintenance or service.
Any damage caused by frozen or broken water hoses or refrigeration pipes in the event of equipment failure.
Any damage due to floods, fire, wind, lightening, accidents, corrosive atmosphere or any other conditions beyond the
control of YMGI Group.
Any damage due to interruption or inadequate electrical service to equipment.
Any products that are installed outside the US or Canada.
Any unit that has been moved from its original installation address.
Any labor costs associated with the installation or service of the unit.
Poor unit performance due to improper unit selection (SEER, Unit size).
To validate the above warranties, ALL of the following conditions must all be fulfilled:
1. The unit was fully (100%) and successfully installed by a licensed or certified HVAC technician.
2. The unit was installed following all NEC, state and local codes.
3. The unit was installed following all the information within the Instructions and User Manuals provided by YMGI Group.
4. ALL fields, especially the technician-checklist, of the Limited Warranty Registration Card/Form were filled
completely by the installing technician and signed by both the installing company technician and the unit owner.
5. The Limited Warranty Registration Card/Form and a copy of the original installing company's invoice have been
received by YMGI Group-Warranty Dept., POB 1559, O'Fallon, MO 63366, within 7 days of successful installation.
No warranty filing will be validated or approved, if any one of the above conditions are not met.
Product registration doesn't guarantee the validity of this limited warranty statement.

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Steps to follow for warranty part replacement:
1. The installing or service technician must contact YMGI tech support at 1-866-833-3138 ext. 703 from the installation
location to check and confirm with YMGI Technical support the exact part(s) needed to fix the problem(s).
2. YMGI will check the customer's warranty filing. There will be no charge for Parts with a validated and approved
warranty. Any Parts that have not been validated and approved or have an invalid warranty filing resulting in an
unapproved warranty request, will be charged accordingly.
3. YMGI will ground ship out the parts ASAP. Expedited shipping is available at the customer's expense.
4. Replacement parts that have an approved warranty registration are to be warranted for the remainder of the 1-year on
parts and a 5-year compressor warranty. Purchasing of replacement parts without a valid warranty filing or unapproved
warranty request, will be sold as is and are not covered by any warranty.
YMGI is continually improving products with various engineering changes and these changes are made without prior
notice. Such improvements or changes include but are not limited to product specification, appearance, functionality,
size, packaging, etc. These improvements or changes will not void the limited warranty stated herein. YMGI is the final
authority concerning this warranty policy.

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WHY DOES YMGI GROUP REQUIRE INSTALLATION AND SERVICE TO BE PERFORMED 100%
BY CURRENTLY LICENSED OR CERTIFIED HVAC TECHNICIANS/CONTRACTORS?
1. Expertise and Safety:
They have the training and experience to accurately and safely install and service your equipment. The equipment runs
with high-pressure refrigerant, oil and electrical current. 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 problem occurs with the unit that has been fully installed by a currently licensed or certified technician/contractor,
contact the original licensed or certified HVAC technician to evaluate the unit as they have the training and experience
to correct the problem quickly and efficiently. A technician may be unwilling to repair an issue on a unit that they did not
install. If you do find a technician willing to perform this service, there is an increased possibility of higher service fees,
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. These laws may require only licensed or certified professionals can install and service this type of high
pressure HVAC equipment.
SUGGESTIONS TO AID YOU IN HIRING AN HVAC CONTRACTOR:
1. Hire a currently practicing, licensed/certified HVAC professional technician/contractor. Technicians, who are no longer
practicing (retired, etc.) in this field, may not have current technical knowledge or may lack experience on the equipment
you have purchased.
2. Hiring a licensed technician to install your unit as a "side job" and not hiring a licensed HVAC company may pose possible
risk. This may result in an incomplete or unsatisfactory installation, no guarantee for workmanship and lack of
maintenance and further service to your unit.
3. Hire a technician/contractor who services customers in your local area and one you are familiar with. Local contractors
have a faster response time and it will be easier for you to determine if they are reputable.
4. Use only a reputable licensed/certified HVAC installation professional to prevent any unexpected charges because of
unethical business practices.
5. Check their references, verify they provide professional service for their customers. N.A.T.E or A.C.C.A certified
technicians are strongly recommended.
6. Some contractors/technicians may not feel comfortable about installing equipment that has been purchased by someone
other than themselves. They prefer to purchase and install the equipment themselves. You can contact YMGI directly
to check and see if there are contractors in your area who have installed our products or any similar products.
7. Ask for a detailed quote for the complete installation project. A flat rate quote is the safest contract for both you and the
contractor.
8. Local HVAC technicians may charge you on a project basis or on an hourly basis. It has been our general experience;
a full single head installation normally can cost $800 to $1500. These costs are estimates, and your actual costs
may differ due to your specific job requirements and installation location.
9. Number of hours can vary depending upon each individual situation, some factors are, but not limited to:
Difficulty or complexity of securely installing the indoor unit.
Difficulty or length of the inter-connecting pipes and wires to be installed.
10. A successful installation is dependent on all these suggestions and all the necessary steps are followed.
11. If the contractor(s)/technician(s) are experienced with the systems/brands you purchased. You might save on the
installation cost, but remember to always ask for and verify references.
12. The contracts should list and detail all work to be performed and the standards they will follow. Some contractors are
willing to include a 1-year installation/service warranty at no extra charge. Check to see if this is an available option. If
available, make sure it is included in the contract.
13. Verify and confirm the installation is completed and all the unit functions have been tested and working properly. All
items on the checklist should be checked and clearly marked in the warranty registration card/form, prior to paying the
contractor in full.
The cost of not having your unit professionally installed can be more expensive than the additional cost of hiring a certified
contractor. Protect your investment and warranty eligibility by doing it right the first time.

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Safety Precautions
1. Follow these instructions to complete the necessary installation process. Carefully read this manual before
installation and unit startup or servicing.
2. Wire size of power cord should be properly sized to meet the required electrical loads. Should the power cord get
damaged, the power cord should be replaced with a manufacturer approved cable.
3. After connecting the power cord, attach the electric box cover and secure properly.
4. Always meet the nitrogen charge requirements when welding pipes.
5. Never short-circuit or cancel the pressure switch as this will result in damage to the unit.
6. Connect the wired controller before energizing, otherwise the wired controller cannot be used.
7. Before using the unit, verify the piping and wiring are correct. This will avoid water leakage, refrigerant leakage,
electric shock, or fire etc.
8. Do not insert fingers or objects into the air outlet or inlet grille.
9. Open a door or window for ventilation for allowing fresh air to enter the room to avoid depleting the oxygen while
gas/oil supplied heating equipment is used during the installation.
10. Never start up or shut off the unit by means of directly plugging into or unplugging the power cord from the power
outlet.
11. Turn off the unit after it runs at least five minutes, otherwise it will influence the oil return of the compressor.
12. Do not allow children to operate this unit.
13. Do not operate this unit with wet hands.
14. Turn off the unit or disconnect the power supply before cleaning the unit. This will avoid possible electric shock
or personnel injury.
15. Never spray or splash water towards the unit. This can cause a malfunction in the unit or can result in electric
shock.
16. Do not expose the unit to moist or corrosive environments.
17. While operating in cooling mode, do not set the indoor unit room temperature too low. Keeping the temperature
difference between indoor and outdoor unit within 41℉(5℃).
18. YMGI Group recommends that only properly trained and authorized personnel be allowed to repair or service the
unit. Improper repairs or servicing can result in electric shock or fire hazards. Please contact YMGI Group if you
need help locating a qualified repair or service technician.
19. Before installation, check the power supply to ensure it is sufficient to meet and is in accordance with the
requirements specified on the nameplate of the unit. Ensure the power overload is functioning correctly and make
sure it is properly maintained.
20. Installation must be performed only by an authorized installer or HVAC professional in accordance with the
requirements set by the NEC and CEC. Do not attempt to install the unit yourself. Improper handling may result
in water leakage, electric shock, fire, and voiding of the warranty.
21. Be sure to use only approved accessories and parts to prevent water leakage, electric shock and fire.
22. Make sure the unit is grounded properly prior to connecting to power source, to avoid electric shock. Do not
connect the ground wire to a gas pipe, water pipe, lightning rod or telephone line.
23. Energize the unit for 8 hours before operation. Turn off or disconnect the power within 24 hours to prevent short-
cycling (to protect the compressor).
24. If refrigerant leakage happens in a confined space during installation, ventilate immediately. Poisonous gases
can occur if the refrigerant gas is exposed to fire.
25. Volatile liquids, such as paint thinners or solvents if exposed to the unit’s surface will cause damage to the surface
finish. Only use a soft cloth along with a mild non-abrasive detergent to clean the outer casing of the unit.
26. If the unit does not operate normally or if you notice any type of burning odor, power off the unit and turn off the
main power supply, then immediately contact your YMGI authorized repair service center or HVAC professional.

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YMGI Group will not be responsible for any personal injury or any property damage caused by
improper or incorrect installation, improper service or maintenance or by not following the instructions
listed in this manual.
DO NOT pull on the power supply cords or refrigeration lines that are connected to the indoor and outdoor
units. Install the power supply cords and secure them into position. PVC line set cover is recommended for the
outdoor unit to protect against rain, sunlight and accidental damage.
DO NOT allow cold air to blow directly onto people for a prolonged period, as this could make people cold and
uncomfortable.
DO NOT undersize any of the power supply wires.
DO NOT connect several units to a single breaker. Don't undersize or oversize the circuit breaker. A poorly
sized circuit breaker can cause unit failure and even fire.
DO NOT wire or open a unit while the unit is running. Make sure to disconnect the power supply and switch off
all circuits prior to inspecting or servicing the unit. Inspecting and servicing the unit while the power supply is
connected, and the circuits are switched on could cause an electrical shock or fire.
DO NOT install the indoor unit near any cooking surfaces, in direct sunlight or any ventilation systems. Poor
placement could decrease efficiency and waste energy.
DO NOT install the unit in places where there is exposure to flammable materials or gas.
DO NOT apply chemical solvents, flammable insecticides, or abrasive materials directly on the unit. Clean the
unit only with a soft dry cloth.
DO NOT install the unit in a damp laundry room or near flammable gas. All units must be protected by a
certified electrical circuit breaker in accordance with all safety and electrical codes.
DO NOT use the system for anything other than what it was designed.
DO NOT store or install the units near food, paint, or other chemicals.
DO NOT use the unit in cool or dry mode for prolonged periods where humidity is higher than 90%.
DO NOT operate the unit for prolonged periods without refreshing ambient air. Open a door or window
periodically to allow in fresh air.

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BRIEF INTRODUCTION TO MINI SPLIT WALL MOUNT SYSTEM
Mini Split Wall Mount Systems are designed for high performance, easy installation and service. Each system consists of
one or several indoor units and one outdoor unit, which are connected by one set or several multiple sets of
interconnection refrigerant pipes and electric wires.
As shown in the following sample picture of outdoor unit, air is drawn through the coil from the rear side and then
discharged from the front side. In cooling mode, air passing through coil is heated; in heating mode, air passing through
coil is cooled.
Outdoor unit(s) provides the electrical and thermal power for the whole system. Electrical and thermal components such
as compressors, motors, heat exchange coils and others, are incorporated into the cabinet in an optimized order. They
can be either hung on the wall or installed on the ground. Once stacking or bracket kit is used, some outdoor units can be
stacked 2 or 3 units high, depending upon unit size and applications. Air is discharged horizontally, quietly and smoothly.
These units are a perfect fit in locations where installation and applications of general up-flow condensing units are
limited, such as apartments, condos, lofts, multi-families and high-rise buildings and others named or unnamed.
Indoor unit(s) delivers the thermal and acoustical comfort to the rooms. Air is drawn through the coil from the front or
topside and then discharged from the bottom. In cooling mode, air passing through coil is cooled; in heating mode, air
passing through coil is heated. Air is cleaned or treated by the built in filter (washable, enzyme, or electrostatic filter types
vary from model to model), before being delivered into the room, with more than enough comfort and care, at a wide angle
(swing or not, varies from model to model).
Apartments
Communication Stations
Homes
NOTE: This ductless system is not designed to be incorporated or used with ducted returns or discharge
tunnels. A single-zone unit SHOULD NOT be used for the cooling or heating load of more than one single story
room. Several single-zone ductless systems or multiple-zone ductless systems would be proper in this
application.

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Notes to Users
YMGI appreciates your purchasing our solar heat pump system. We are committed to serving our customers, and
ensuring that your heat pump will provide years of service. Our solar heat pump is manufactured under the strictest
quality controls, to provide excellent performance and reliability. To protect your rights and interests, and guarantee
the best performance of our solar heat pump, and to ensure you receiving the best service, we ask you to follow
these guidelines:
1. Before using your solar heat pump, please be sure to read all Notices to avoid damaging the solar air
conditioner, or other accidents that could be caused as a result of faulty operation.
2. Make sure to turn off power to the solar heat pump when the system will not be in use for prolonged periods.
3. The correct installation and application assure the best performance of the solar heat pump. Please read the
Operation Instructions before installation, adjustment and application.
4. This machine and the Operation Instruction are subject to changes without notice.
5. The carried standard of the product is Q/320581FSC001-2006
Please keep your purchase invoice, Warranty Card and Operation Instructions.

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Solar System Layout
All DC Solar PV Powered DC Heat Pump
Single zone 9k, 12k, 18k and 24K Btu/h.
Connects to 3 to 8 Panels (300W/panel), through charge controller.
With battery banks 24 or 48VDC with a great enough AH capacity, can run without sunshine or AC input.
Day & Night saving.
Like all DC-Inverter units, the YMGI’s (86) series solar heat pump runs totally on DC power. With solar charge
controller, solar panels save extra energy into batteries, and batteries release to heat pump system when needed.
By using solar DC power instead of converting to DC from AC power provided by utility company, this system can
reduce daytime energy costs for cooling or heating by up to 100%, and is great fit for cooling or heating needs on
islands, in mountains and other remote areas (communication stations, travel/camps, military bases, etc.).

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Solar System Layout
All DC with Optional AC Input
Single zone 9k, 12k, 18k and 24K Btu/h.
Connects to 3 to 8 Panels (300W/panel), through charge controller.
With battery banks 24 or 48VDC with a great enough AH capacity, can run without sunshine or AC input.
Option to connect to AC/Converter.
Day & Night saving.
Like all DC-Inverter units, the YMGI’s (86) series solar heat pump runs totally on DC power. With solar charge
controller, solar panels save extra energy into batteries, and batteries release to heat pump system when needed.
By using solar DC power instead of converting to DC from AC power provided by utility company, this system can
reduce daytime energy costs for cooling or heating by up to 100%, and is great fit for cooling or heating needs on
islands, in mountains and other remote areas (communication stations, travel/camps, military bases, etc.).
The features and specifications may differ from those found in our advertising literature. Always consult the manual for
the most accurate information about your units.

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CONNECTION OF WIRES
WIRING AT INDOOR UNIT AND OUTDOOR UNITS
Open the front cover panel.
Remove screws from electrical box cover and put screws in secured position.
Remove screws from fastener and put screws in secured position.
Prepare wires of right size and grade.
Recommend to use factory-provided wire/cables.
Connected to the terminals following wiring diagrams (terminal or color matches).
Clamp power/control wires to the structure to keep the tension form being transmitted to the wire connection.
Replace screws or fasteners back to where they were.
Notes:
The environment conditions must be taken into consideration when the connections of power cable are made
(such as the ambient temperature, direct exposure to heat exposure to sunlight).
The specifications for the power cable refer to the minimum values of the metal core wires, taking into
consideration the voltage losses, the core wire of power cable must be one size larger than the specifications.
The grounding wire must be connected to the indoor units and outdoor units.
The laying of power cables must be done by qualified electricians and comply with the regulations of the local
power supply authorities and with the standards of the electric appliance.

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IMPORTANT NOTES FOR UNIT OPERATION AMBIENT & SIZING
Since the outdoor units can be installed on a wall or balcony (close to the indoor unit) the following are some benefits for
contractors and customers:
Indoor unit operates much quieter than air diffuser of central air conditioning system.
Connection pipes and refrigerant usage is much lower when compared to installing up-flow condensing units on
the ground and long copper/wire lines needed between indoor and outdoor units.
Installation work is easier and requires less time.
Increased efficiency and lifetime of system.
YMGI Mini Split Wall Mount Systems are all heat pumps (some manufacturers make cooling only, and heat pumps with
auxiliary electric heaters). These units can be easily wired. Either indoor unit or outdoor unit can be used with any
matched comparable outdoor unit or indoor unit as long as they have matched size and control. Must refer to electrician
before doing so.
Each system is thoroughly tested before leaving the factory. Each unit is acoustically, thermally and systematically
designed to give optimum quality and reliability.
Find the cooling/heating load capacity of the space where the unit will be in service. Select matched WMMS units for the
space. Under sizing or over sizing equipment is NOT recommended.
UNIT ENGINEERING SUBMITTALS-MECHANICAL

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SOLAR POWERED MINI WALL MOUNT SYSTEMS
System Specifications
Model No.
WMMS-09KS-V2D(86)
WMMS-12KS-V2D(86)
WMMS-18KS-V2D(86)
WMMS-24KS-V2D(86)
Power Supply：
24VDC (21V to 27V)
48VDC (42V to 54V)
48VDC (42V to 58V)
48VDC (42V to 58V)
Performance
Rated Capacity
Cooling
Btu/h
9000
12000
18000
24000
W
2600
3500
5000
7200
Heating
Btu/h
10000
13000
20000
28000
W
2850
3700
5500
8000
Noise
Indoor
dB(A)
≤40
≤42
≤42
≤46
Outdoor
dB(A)
≤52
≤52
≤54
≤58
Air Circulation
cfm
265
325
383
500
Suitable Area
m²
8~15
12~25
22~35
30~45
EER
W/W
4.56
3.89
3.89
3.89
Btu/h/w
15.5
13.33
13.33
13.33
Batteries
12 VDC x 2
12 VDC x 4
12 VDC x 4
12 VDC x 4
Battery AH(each)
AH
60 x 2
100 x 4
150 x 4
250 x 4
Solar panel specification
12V/150W x 4
48V/200W x 4
48V/150W x 8
48V/150W x 12
Refrigerant
R-134a
R-134a
R-134a
R-134a
Power Consumption
Power Input
W
570
900
1100
1300
Rated Current
A
11.6
16
23
32
Input Power
V
DC 24
DC 48
DC 48
DC 48
Dimensions
Indoor Unit
Shipping
in.
30.51” x 10.25” x 8.27”
30.51” x 10.25” x 8.27”
30.51” x 10.25” x 8.27”
42.125” x 14.57” x 10.25”
NET
in.
33” x 12.8” x 10.4”
33” x 12.8” x 10.4”
33” x 12.8” x 10.4”
38.78” x 12.6” x 8.46”
Outdoor Unit
Shipping
in.
31.1” x 10.25” x 21.25”
31.1” x 10.25” x 21.25”
31.1” x 10.25” x 21.25”
37.4” x 16.14” x 30”
NET
in.
35.83” x 14.57” x 24”
35.83” x 14.57” x 24”
35.83” x 14.57” x 24”
33.46” x 11.81”x 27.95”
Solar Panel
Shipping
in.
42.28” x 31.5” x 6.5”
42.28” x 31.5” x 6.5”
42.28” x 31.5” x 6.5”
42.28” x 31.5” x 6.5”
NET
in.
47.25” x 34.65” x 8”
47.25” x 34.65” x 8”
47.25” x 34.65” x 8”
47.25” x 34.65” x 8”
Battery
Shipping
in.
25.4” x 9.65” x 19.5”
25.4” x 9.65” x 19.5”
25.4” x 9.65” x 19.5”
25.4” x 9.65” x 19.5”
NET
in.
15.95” x 6.9” x 9.25”
7” x 12.125” x 6.7”
7” x 12.125” x 6.7”
7” x 12.125” x 6.7”
Weight
Indoor Unit
Net/Gross
lbs.
22.046 / 28.66
28.66 / 33.07
33.07 / 37.48
37.48 / 41.89
Outdoor Unit
Net/Gross
lbs.
88.18 /99.21
99.21 / 105.82
121.25 / 127.87
127.87 / 143.3
Solar Panel
Net/Gross
lbs.
66.14 / 77.16
66.14 / 77.16
88.18 / 99.20
88.18 / 99.21
Battery
Net/Gross
lbs.
44.09 / 57.32
44.09 / 57.32
66.14 / 79.37
66.14 / 79.37
Notes:
1. Parameters in the above table are measured in their rated working state according to GB/T7725-2004.
Changes may appear according to the real world working conditions.
2. Parameters may change due to the product improvement. Please refer to the products nameplate.