Ecoer 36K User manual

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SDi Decades Extreme ODU IM ECOER INC.
NOTE: Appearance of unit may vary.
Installation Manual
SDi Decades Extreme
3/5Ton R410A Heat Pump
Contents
1. Safety-------------------------------------------------
2. Unit Location Considerations-------------------
3. Position the Unit-----------------------------------
4. Refrigerant Line Considerations---------------
5. Refrigerant Line Routing------------------------
6. Refrigerant Line Connecting--------------------
7. System Leak Check--------------------------------
8. Evacuation------------------------------------------
9. Service Valves---------------------------------------
10. Electrical --------------------------------------------
11. System Charge Adjustment----------------------
12. Outdoor Unit DIP Switch Setting-------------
13. Test Run ----------------------------------------
14. Troubleshooting-----------------------------------
15. Wiring Diagram----------------------------------
16. Accessories------------------------------------------
2
5
7
9
11
12
14
15
16
17
22
22
23
24
25
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All phases of this installation must comply with National, State and Local Codes.
This document is customer’s property and is to remain with this unit.Please return it to customer with service information upon
completion of work.These instructions do not cover all variations in systems or provide for every possible contingency to be met in
connection with the installation.Should further information be desired or should particular problems arise which are not covered
sufficiently for the purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.
Installation must be performed in accordance
with the requirements of NEC and CEC by
authorized personnel only.

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1. Safety
The following safety guidelines are intended to prevent unforeseen risks or damage from
unsafe or incorrect operation of the appliance. Please check the packaging and appliance
on arrival to make sure everything is intact to ensure safe operation. If you find any
damage, please contact the retailer or dealer. Please note modifications or alterations to
the appliance are not allowed for your safety. Unintended use may cause hazards and
loss of warranty claims.
Intended Use
Explanation of Symbols
CAUTION The signal word indicates a hazard with a low degree of risk which, if not avoided,
may result in minor or moderate injury.
WARNING The signal word indicates a hazard with a medium level of risk which, if not avoided,
may result in death or serious injury.
NOTICE The signal word indicates important information (e.g. damage to property),
but not danger.
Read these operating instructions carefully and attentively before using/commissioning the
unit and keep them in the immediate vicinity of the installation site or unit for later use!
WARNING
This appliance is not intended for use by persons(including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by aperson responsible for their safety. Children
should be supervised to ensure that they do not play with the appliance.
WARNINGS FOR PRODUCT USE
•If an abnormal situation arises (like aburning smell), immediately turn off the unit and disconnect
the power. Call your dealer for instructions to avoid electric shock, fire or injury.
•Do not insert fingers, rods or other objects into the air inlet or outlet.This may cause injury, since
the fan may be rotating at high speeds.
•Do not use flammable sprays such as hair spray, lacquer or paint near the unit.This may cause fire
or combustion.
•Do not store gasoline or flammable substances near air conditioner.Emitted gas may collect around
the unit and cause explosion.
•Do not Install your air conditioner in awet room such as abathroom or laundry room.Too much
exposure to water can cause electrical components to short circuit.
•Do not expose your body directly to cool air for a prolonged period of time.
•Do not allow children to play with the air conditioner. Children must be supervised around the unit
at all times.
•If the air conditioner is used together with burners or other heating devices, thoroughly ventilate the
room to avoid oxygen deficiency and carbon monoxide build up.

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•In certain environments, such as kitchens, server rooms, etc., the use of specially designed air-
conditioning units is highly recommended.
•Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Installation and service must be performed by alicensed professional
HVAC installer or equivalent, service agency, or the gas supplier.
WARNINGS FOR CLEANING AND MAINTENANCE
•Turn off the device and disconnect the power before cleaning. Failure to do so can cause electrical
shock.
•Do not clean the air conditioner with excessive amounts of water.
•Do not clean the air conditioner with combustible cleaning agents.Combustible cleaning agents can
cause fire or deformation.
ELECTRICAL WARNINGS
•Do not share the electrical circuit with other appliances.This equipment requires a dedicated
electrical circuit.
•The product must be properly grounded at the time of installation, or electrical shock may occur.
•For all electrical work, follow all local and national wiring standards, regulations, and the Installation
Manual.Connect cables tightly, and clamp them securely to prevent external forces from damaging
the terminal.Improper electrical connections can overheat and cause fire, and may also cause shock.
All electrical connections must be made according to the Electrical Connection Diagram located on
the panels of the indoor and outdoor units.
•All wiring must be properly arranged to ensure that the control board cover can close properly. If the
control board cover is not closed properly, it can lead to corrosion and cause the connection points
on the terminal to heat up, catch fire, or cause electrical shock.
WARNINGS FOR PRODUCT INSTALLATION
•Installation must be performed by an authorized dealer or specialist.Defective installation can cause
water leakage, electrical shock, or fire.
•Installation must be performed according to the installation instructions.Improper installation can
cause water leakage, electrical shock, or fire.
(In North America, installation must be performed in accordance with the requirement of NEC and
•Contact an authorized service provider for repair or maintenance of this unit.This appliance shall be
installed in accordance with national wiring regulations.
•Only use the included accessories, parts, and specified parts for installation. Using non-standard
parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.
•Install the unit in afirm location that can support the unit’s weight.If the chosen location cannot
support the unit’s weight, or the installation is not done properly, the unit may fall and cause serious
injury and damage.
•Install drainage piping according to the instructions in this manual.Improper drainage may cause
water damage to your home and property.
•Do not install the unit in alocation that may be exposed to combustible gas leaks.If combustible gas
accumulates around the unit, it may cause fire.
CEC by authorized personnel only.)

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•Do not turn on the power until all work has been completed.
•When moving or relocating the air conditioner, consult experienced service technicians for
disconnection and reinstallation of the unit.
•Unit must be properly supported and secured to prevent tipping of unit.
•Excessive Weight Hazard -Use two or more people when moving and installing the unit. Failure to do
so can result in back or other type of injury.
CAUTION
•Turn off the air conditioner and disconnect the power if you are not going to use it for along time.
•Make sure that water condensation can drain unhindered from the unit.
•Do not operate the air conditioner with wet hands.This may cause electric shock.
•Do not use device for any other purpose than its intended use.
•Do not climb onto or place objects on top of the outdoor unit.
•As with any mechanical equipment, contact with sharp sheet metal edges can result in personal
injury.Take care while handling this equipment and wear gloves and protective clothing.
NOTICE
TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board (PCB) is designed with afuse to provide overcurrent protection.
This fuse must be replaces with identical component.
The specifications of the fuse are printed on the circuit board ,examples of such are T5A/250VAC
and T10A/250VAC.
NOTE ABOUT FLUORINATED GASSES (NOT APPLICABLE TO THE UNIT USING R290
REFRIGERANT)
•This air-conditioning unit contains fluorinated greenhouse gasses.For specific information on the
type of gas and the amount, please refer to the relevant label on the unit itself or the “Owner's
Manual - Product Fiche ”in the packaging of the outdoor unit.(European Union products only).
•Installation, service, maintenance and repair of this unit must be performed by acertified technician.
•Product uninstallation and recycling must be performed by acertified technician.
•When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.

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2. Unit Location Considerations
Units are packaged for shipment to avoid damage during normal transit and handling.It is the receiving
party’s responsibility to inspect the equipment upon arrival.Any obvious damage to the carton box
should be reported on the bill of lading and aclaim should be filed with the transportation company,
and the factory should be noticed.
All units should be stored in the factory shipping carton with internal packaging in adry place until
installation. Carefully remove the packaging and inspect for hidden damage.Any hidden damage should
be recorded and the factory should be notified.The gauge port can be used to check the refrigerant
charge has been retained during shipment.
2.1 Inspect Units
The outdoor unit can be anchored to the ground or to awall-mounted bracket with bolt(M10). Prepare
the installation base of the unit according to the dimensions below.
2.2 Unit Dimensions
Model
Outdoor Unit Dimension Mounting Dimension
W H D A B
mm inch mm inch mm inch mm inch mm inch
36K 952 37-1/2 1333 52-1/2 415 16-11/32 634 24-35/36 404 15-29/32
60K 952 37-1/2 1333 52-1/2 415 16-11/32 634 24-35/36 404 15-29/32

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Before installing the outdoor unit, you must choose an appropriate location.The following are standards
that will help you choose an appropriate location for the unit.
Proper installation locations meet the following standards:
2.3 Location Restrictions
Near an obstacle that will block
air inlets and outlets. In a
location that is exposed
to large amounts of dust.
Near a public street,
crowded areas, or where
noise from the unit will
disturb others.
Near animals or plants that will be
harmed by hot air discharge.
Near any source of combustible gas
DO NOT install unit in the following locations:
CAUTION
SPECIAL CONSIDERATIONS FOR EXTREME WEATHER
If the unit is exposed to heavy wind:
Install unit so that air outlet fan is at a90°angle to the direction of the wind.If needed, build abarrier in
front of the unit to protect it from extremely heavy winds.See Figures below.
If the unit is frequently exposed to heavy rain or snow:
Build ashelter above the unit to protect it from the rain or snow.Be careful not to obstruct air flow
around the unit.

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3. Position the Unit
3.1 If you will install the unit on the ground or on a concrete
mounting platform, DO THE FOLLOWING:
•Mark the positions for four expansion bolts based on
dimensions chart.
•Pre-drill holes for expansion bolts.
•Place a nut on the end of each expansion bolt.
•Hammer expansion bolts into the pre-drilled holes.
•Remove the nuts from expansion bolts, and place outdoor
unit on bolts.
•Put washer on each expansion bolt, then replace the nuts.
•Using a wrench, tighten each nut until snug.
WARNING
When drilling into concrete, eye
protection is recommended at all times.
3.2 If you will install the unit on a wall-mounted bracket, DO THE
FOLLOWING:
•Mark the position of bracket holes based on dimensions
chart.
•Pre-drill the holes for the expansion bolts.
•Place a washer and nut on the end of each expansion bolt.
•Thread expansion bolts through holes in mounting
brackets, put mounting brackets in position, and hammer
expansion bolts into the wall.
•Check that the mounting brackets are level.
•Carefully lift unit and place its mounting feet on brackets.
•Bolt the unit firmly to the brackets.
•If allowed, install the unit with rubber isolator pads o
reduce vibrations and noise.
CAUTION
Make sure that the wall is made of solid
brick, concrete, or of similarly strong
material.The wall must be able to
support at least four times the weight of
the unit.
3.3 Rows of series installation:
L A
L<H L ≤ 1/2H 25 cm / 9-13/16in or more
1/2H < L ≤ H 30 cm / 11-13/16in or more
L>H Can not be installed
Rows of series installation
The relations between H, A and L are as follows.

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3.4 Install drain fitting(Heat pump unit only)
Base pan hole
of outdoor unit
Step 1：
Find out the base pan hole of outdoor unit.
Seal
Step 2：
•Fit the rubber seal on the end of the drain fitting that will connect to the outdoor unit
•Insert the drain fitting into the hole in the base pan of the unit. The drain fitting will click in
place.
•Connect a drain hose extension (not included) to the drain fitting to redirect water from the unit
during heating mode.
NOTICE
IN COLD CLIMATES
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage.
If water drains too slowly, it can freeze in the hose and flood the unit.

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4. Refrigerant Line Considerations
4.1 Safety Precautions
WARNING
•All field piping must be completed by alicensed technician and must comply with the local and
national regulations.
•When the air conditioner is installed in asmall room, measures must be taken to prevent the
refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant
leakage.If the refrigerant leaks and its concentration exceeds its proper limit, hazards due to lack of
oxygen may result.
•When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not
enter the refrigerant circuit.Contamination in the system may cause poor operating capacity, high
pressure in the refrigeration cycle, explosion or injury.
•Ventilate the area immediately if there is refrigerant leakage during the installation.Leaked
refrigerant gas is both toxic and flammable.Ensure there is no refrigerant leakage after completing
the installation work.
4.2 Refrigerant Line Limits
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor
and outdoor units meets the requirements shown in the following table:
The Maximum Length And Drop Height
Based on Models. (Unit: m/ft.)
Type of model Capacity
(Btu/h)
Length of
piping
Maximum
drop height
North America, Australia
and the EU frequency
conversion Split Type.
36K 65/213 30/98.4
60K 65/213 30/98.4
CAUTION
Oil traps
If oil flows back into the outdoor unit’s compressor, this
might cause liquid compression or deterioration of oil
return. Oil traps in the rising gas piping can prevent this.
An oil trap should be installed
every 10m(32.8ft) of vertical suction line riser
(≥36000Btu/h unit).

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Name Shape Quantity(PC)
Connecting pipe assembly
Liquid side 9. 52( 3/ 8in) The correct connecting
pipes are included with
your equipment.
Gas side 19( 3/ 4in)
22( 7/ 8in)
Air Handler Unit
Model
Air Handler Unit
Connection(in.flare)
Adapter Required at
Air Handler Unit
(in.flare to braze)
Outdoor
Model
Outdoor Unit
Connection (in.
flare)
Adapter Required at
Outdoor Unit
(in. flare to flare or braze)
36K Liquid 3/8 3/8flare→3/8braze 36K Liquid 3/8 3/8flare→3/8braze
Gas 3/4 3/4flare→3/4braze Gas 3/4 3/4flare→3/4braze
60K Liquid 3/8 3/8flare→3/8braze 60K Liquid 3/8 3/8flare→3/8braze
Gas 7/8 7/8flare→7/8braze Gas 7/8 7/8flare→7/8braze
The suction line must always be insulated.
DO NOT allow the suction line and liquid line to come in
direct (metal to metal) contact.
4.3 Refrigerant Line Insulation Liquid line Suction line
Insulation
For retrofit applications where the existing refrigerant
lines will be used, the following precautions should be
taken:
•Ensure that the refrigerant lines are the correct size.
It’s not recommended to use suction line bigger than
standard size, in which will result poor oil return for
inverter compressor.
4.4 Reuse Existing Refrigerant Lines
CAUTION
If using existing refrigerant lines, make sure that
all joints are brazed, not soldered.

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•Ensure that the refrigerant lines are free of leaks, acid and mineral oil.When replacing R-22
system with anew R-410Asystem, be sure the existing lines can endure R-410A pressure which is
50~70%higher than R-22 system.Use flush (e.g. Rx11)to remove the old mineral oil, sludge,
moisture, acid and other contaminants out of the line set.
IM PO RTANT:
The manufacturer recommends installing only approved matched indoor and outdoor systems.All of
the manufacturer’s split systems are AHRI rated with TXV indoor units.Some of the benefits of
installing approved matched indoor and outdoor split systems are maximum efficiency,
optimum performance and the best overall system reliability.
5. Refrigerant Line Routing
Comply with National, State, and Local Codes when isolating line sets from joists, rafters, walls, or
other structural elements.Take precautions to prevent noise within the building structure due to
vibration transmission from the refrigerant lines.For Example:
•Use isolation type hangers when the refrigerant lines have to be fastened to floor joists or other framing.
•Isolation hangers should also be used when refrigerant lines traverse stud spaces or enclosed ceilings.
•Where therefrigerant lines pass through awall or sill, it should be insulated and isolated.
•Isolate thelines from all ductwork.
•Minimize thenumber of 90ºturns.
8 Feet Maximum
Side View 8 Feet Maximum
Joist/Rafter
Isolator
Line Set
Secure suction line from joists using isolators every 8 ft. Secure liquid line directly to insulated suction line using tape, wire,
or other appropriate method every 8 ft.
8 Feet Maximum
Side View 8 Feet Maximum
Wall
Isolator
Line Set
Secure suction line using isolators every 8 ft. Secure liquid line directly to insulated suction line using tape, wire, or other
appropriate method every 8 ft.

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Sealant
Suction line
Insulation
Wall
Ductwork
Isolator
Line Set
6. Refrigerant Line Connecting
CAUTION
•The branching pipe must be installed horizontally.An angle of more than 10°may cause
malfunction.
•DO NOT install the connecting pipe until both indoor and outdoor units have been installed.
•Insulate both the gas and liquid piping to prevent condensation.
Step 1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
•Measure the distance between the
indoor and outdoor units.
•Using a pipe cutter, cut the pipe a little
longer than the measured distance.
•Make sure that the pipe is cut at a
perfect 90°angle.
Oblique Rough Warped
90°
NOTICE
DO NOT DEFORM PIPE WHILE
CUTTING
Be extra careful not to damage, dent, or
deform the pipe while cutting.This will
drastically reduce the heating.
Step 2: Remove burrs
Burrs can affect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
Pipe
Reamer
Point down
•Hold the pipe at a downward angle to
prevent burrs from falling into the pipe.
•Using a reamer or deburring tool, remove all
burrs from the cut section of the pipe.

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Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight
seal.
•Remove PVC tape from ends of pipe when ready
to perform flaring work.
•After removing burrs from cut pipe, seal the ends
with PVC tape to prevent foreign materials from
entering the pipe.
•Sheath the pipe with insulating material.
•Place flare nuts on both ends of pipe. Make sure
they are facing in the right direction, because
you can’t put them on or change their direction
after flaring.
Copper pipe
Flare nut
•Place flaring tool onto the form.
•Turn the handle of the flaring tool clockwise
until the pipe is fully flared.
•Clamp flare from on the end of the pipe. The
end of the pipe must extend beyond the flare
form.
Flare form
Pipe
PIPING EXTENSION BEYOND FLARE FORM
Pipe
gauge
Tightening
torque
Flare dimension(A)
(Unit:mm/lnch) Flare
shape
Min. Max.
∅9.52
(∅3/8’’)
32-39N.m
(320-390kgf.cm) 13.2/0.52 13.5/0.53
∅19
(∅3/4’’)
67-101N.m
(670-1010kgf.cm) 23.2/0.91 23.7/0.93
∅22
(∅7/8’’)
85-110N.m
(850-1100kgf.cm) 26.4/1.04 26.9/1.06
•Remove the flaring tool and flare form, then
inspect the end of the pipe for cracks and even
flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit first,
then connect it to the outdoor unit. You should
first connect the low-pressure pipe, then the high
pressure pipe.
•When connecting the flare nuts, apply athin
coat of refrigeration oil to the flared ends of the
pipes.
•Align the center of the two pipes that you will
connect.
•Tighten the flare nut snugly by hand.
•Using a wrench, grip the nut on the unit tubing.
•While firmly gripping the nut, use a torque
wrench to tighten the flare nut according to the
torque values in above table.
Outdoor unit
Liquid side piping (Smaller diameter)
(Bigger
Torque wrench
NOTICE
Use both aspanner and atorque wrench
when connecting or disconnecting pipes
to/from the unit.
CAUTION
Ensure to wrap insulation around the piping.
Direct contact with the bare piping may result
in burns or frostbite.
•Make sure the pipe is properly connected.
Over tightening may damage the bell mouth
and under tightening may lead to leakage.

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NOTICE
MINIMUM BEND RADIUS
Carefully bend the tubing in the middle
according to the diagram below.
DO NOT bend the tubing more than 90°or
more than 3times.
Use care when bending pipe, do not kink pipe.
Use appropriate tool
min-radius 10cm(3.9’’ )
•After connecting the copper pipes to the indoor
unit, wrap the power cable, signal cable and the
piping together with binding tape.
NOTICE
DO NOT intertwine signal cable with other
wires.While bundling these items together.
DO NOT intertwine or cross the signal cable
with any other wiring.
7. System Leak Check
Leak check is required for the brazed line connections.
1. Pressurize the brazed refrigerant lines and indoor coil to at least 450 PSIG using dry nitrogen.
2. Wait for 10 minutes without adrop in pressure.
3. Check for leaks by using a soapy solution or bubbles at each brazed location.
450PSIG

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8. Evacuation
NOTICE
When opening valve stems, turn the hexagonal wrench until it hits against the stopper.Do not try to
force the valve to open further.
open valves slowly until your hear refrigerant, allow pressure to equalize before opening fully. Open
large vapor line valve first.
8.1 Preparations and precautions
Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage
the air conditioner, reduce its efficiency,
and cause injury.Use avacuum pump and manifold gauge to evacuate the refrigerant circuit, removing
any non-condensable gas and moisture from the system.Evacuation should be performed upon initial
installation and when unit is relocated.
BEFORE PERFORMING EVACUATION:
•Check to make sure the connective pipes between the indoor and outdoor units are connected
properly.
•Check to make sure all wiring is connected properly.
8.2 Evacuation Instructions
1. Connect the charge hose of the manifold gauge to service port on the outdoor unit’s low pressure
valve.
2. Connect another charge hose from the manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed.
4. Tighten refrigerant valve caps hand tight plus flat to ensure there are no vacuum leaks.
5. Turn on the vacuum pump to evacuate the system.
6. Run the vacuum for at least 15 minutes, or until the Compound Meter reads -76cmHG(-105Pa) or
500 microns.
7. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.
8. Wait for 5 minutes, then check that there has been no change in system pressure.
9. If there is a change in system pressure, refer to Gas Leak Check section for information on how to
check for leaks. If there is no change in system pressure, unscrew the cap from the packed valve
(high pressure valve).
10. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning
the wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve
after 5 seconds.
11. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The
Pressure Gauge should read slightly higher than atmospheric pressure.
12. Remove the charge hose from the service port.
13. Using hexagonal wrench, fully open both the high pressure and low pressure valves.
14. Tighten all valve caps hand tight plus one flat to ensure no leaks. You may tighten it further using a
torque wrench if needed.

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Outdoor unit
-76cmHg
Compound
gauge
Low
pressure
valve
High
pressure
valve
Pressure hose
or
Charge hose
Vacuum
pump
Pressure
gauge
Low pressure
valve
Charge
hose
Manifold
Gauge
Flare nut
Cap
valve body
valve stem
9. Service Valves
Leak check and evacuation must be completed before opening the service valves.
The gas service valve must be opened BEFORE opening the Liquid Service Valve!
1. Remove service valve cap.
2. Fully insert hex wrench into the stem and counterclockwise until valve stem just touches the rolled
edge (approximately five turns.)
3. Replace and tighten the valve stem cap to prevent leaks. Additional 1/6 turn may be required.
Repeat 1to 3for Liquid Service Valve.
WARNING
Extreme caution should be exercised when opening the Liquid Service Valve.Turn counterclockwise
until the valve stem just touches the rolled edge.No torque is required.
Failure to follow this will result in abrupt release of system charge and may lead to personal injury
and /or property damage.

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WARNING
BEFORE PERFORMING ANY ELECTRICAL WORK, READ THESE WARNINGS.
WIRING PRECAUTION
•All wiring must comply with local and national electrical codes, regulations and must be installed by
alicensed electrician.
•All electrical connections must be made according to the Electrical Connection Diagram located on
thepanels of the indoor and outdoor units.
•If there is aserious safety issue with the power supply, stop work immediately. Explain your
reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.
•Power voltage should be within 90-110% of rated voltage. Insufficient power supply can cause
malfunction, electrical shock, or fire.
•Installation of an external surge suppressor at the outdoor disconnect is recommended.
•Power must be connected, aswitch or circult breaker that disconnects all poles and has contact
separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. The qualified
technician must use an approved circuit breaker or switch.
•Only connect the unit to an individual branch circuit. Do not connect another appliance to that
circuit.
•Make sure to properly ground the air conditioner.
•Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in
product malfunction and possible fire.
•Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within
the unit.
•To avoid getting an electric shock, never touch the electrical components soon after the power supply
has been turned off. After turning off the power, always wait 10 minutes or more before you touch
the electrical components.
•Make sure that you do not cross your electrical wiring with your signal wiring. This may cause
distortion, interference or possibly damage to circuit boards.
•Connect the outdoor wires before connecting the indoor wires.
WARNING
BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE
SYSTEM.
10. Electrical
10.1 Power wring
WARNING
Before performing any electrical or wiring work, turn off the main power to the system.

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Step 1: Prepare the cable for connection.
1. You must first choose the right cable size.
2. Using wire strippers, strip the jacket from
both ends of the signal cable to reveal
approximately 15cm (5.9”) of wire.
3. Strip theStranded wire requires u-lugs or ring
terminals to be crimped onto the ends of the wire.
4. insulation from the ends.
Step 2: Remove the electric cover.
Remove the electric cover of the outdoor unit.
Step 3: Connect the u-lugs to
the terminals.
Match the wire colors/labels with the labels on the
terminal block. Firmly screw the u-lug of each wire
to its corresponding terminal.
3. Reinstall thecover of the electric control box.
1.Remove thewire cover from the unit by
loosening the 3 screws.
2. Remove caps on the conduit panel.
3. Mount theconduit tubes(not included) on the
caonduit panel.
4. Properly connect both the power supply and
low voltage lines to the corresponding
terminals on the terminal block.
5. Ground theunit in accordance with local codes.
6. Be sure to size each wire allowing several
inches longer than the required length for wiring.
In North America
Terminal block
Connecting cable
G
Power supply cord
Conduit panel
Wire Cover
Please select the appropriate through-hole according to the
diameter of the wire.
CLAS S 2
Outdoor Unit A
Outdoor Unit B
1. Clamp down the cable with the cable clamp.
2. Insulate unused wires with electrical tape. Keep
them away from any electrical or metal parts.
L1 L2
TO POWER SOURCE
TO POWER SOURCE
L1 L2
OPTIONAL
B W D
R C Y1 Y2 L
CLASS 2
B W D
R C Y1 Y2 L
NOTICE
•When connecting the wires, strictly follow the
wiring diagram found inside the electrical box
cover.
•Choose the cable type according to the local
electrical switches and regulations.
•Please choose the right cable size according to
the Minimum Circuit Ampacity indicated on the
nameplate of the unit.
WARNING
Isolate the power supply leads and communication
leads by the strain relif and keep power supply
leads away from communication leads.

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10.2 Control wiring
WARNING
Please refer to the wiring nameplate for the wiring method.Do not connect 24VAC to S1 - S2, as this will
damage the system.
Connection method A:
This is the preferred method of control with the
communicating control, indoor and outdoor
unit. Refer to the wiring method of internal and
external machine communication and wired
controller as follows:
Connection method B:
To use a 24V thermostat, you need to refer to
the following wiring:
When using a24V thermostat, please refer to the
non-communicating wiring diagrams that follow:
Connection method C:
To use a 24V thermostat, you need to refer to
the following wiring:
NOTICE
This equipment uses B functionality. This
terminal is energized for heating functionality.
Please ensure that thermostat configuration is
set up for B functionality.
Note: These methods are for use with a Ecoer
outdoor unit and a third party indoor unit
or cased coil and gas furnace.
24V must never be connected to S1 –S2. All
wiring must be in compliance with the above
scenarios. Incorrect wiring will cause
irreversible damage to control.
24V connection Dip Switch setting as
shown in the picture:
NOTICE
The use of shielded communication or
thermostat wire is not required, but is
recommended where separation from high
voltage conductors can not be maintained, or in
areas with high electrical noise.
The shield and drain conductor must be
grounded at the outdoor unit and stripped back
and taped at the indoor unit.Grounding at both
ends results in an increase of noise transmitted
onto the signal wires.

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NOTICE
The following wiring diagram are suitable for the AHU and ODU with 24V thermostat.
Non-communication scheme wiring reference
•Wiring for 4H and 2C thermostat •Wiring for 3H and 2C thermostat
•Wiring for 3H and 1C thermostat •Wiring for 2H and 2C thermostat
•Wiring for 3H and 2C thermostat •Wiring for 2H and 1C thermostat
•Wiring for 1H and 1C thermostat •Wiring for 1H and 1C thermostat
S4-2 Default on, W1 and W2
shorted for single stage Aux heat
operation. Turn off to separate stages.
S4-1 Default on，DH function off.
Turn switch off to activate DH
function. S4-2 Default on, W1 and W2
shorted for single stage Aux heat
operation. Turn off to separate stages.
S4-1 Default on，DH function off.
Turn switch off to activate DH
function.
S4-2 Default on, W1 and W2 shorted for
single stage Aux heat operation. Turn off
to separate stages
S4-1 Default on，DH function off.
Turn switch off to activate DH
function.
S4-2 Default on, W1 and W2
shorted for single stage Aux heat
operation. Turn off to separate stages.
S4-1 Default on，DH function off.
Turn switch off to activate DH
function.
S4-2 Default on, W1 and W2
shorted for single stage Aux heat
operation. Turn off to separate stages.