Cooper & Hunter CH-M18AHU Repair manual

IMPORTANT NOTE:
Read this manual carefully before installing
or operang your new air condioning
unit. Make sure to save this manual for
future reference.
AIR-HANDLER AIR CONDITIONERS
Owner’s Manual &
Installation Manual
MODELS:
CH-M18AHU
CH-M24AHU

Indoor Unit Parts And Major Functions .............................................08
Owner’s Manual
Table of Contents
Safety Precautions ............................................................................04
Care and Maintenance...................................................................10
Troubleshooting..............................................................................12
1. Unit Parts..............................................................................................................................................08
2. Operang Condions............................................................................................................................08
3. Features ................................................................................................................................................09
4. Energy Saving Tips.................................................................................................................................09

Installation Manual
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Accessories
Indoor Unit Installation
1. Indoor Unit Parts
2. Safety Precauons
3. Indoor Unit Installaon Instrucons
4. Installaon of Electric Auxiliary Heat Module
Outdoor Unit Installation
1. Select installaon locaon
2. Install drain joint
3. Anchor outdoor unit
Drainpipe Installation
1. NOTE ON PURCHASING PIPES
2. Indoor Drainpipe Installaon
Refrigerant Piping Connection
1. Safety Precauons
2. Notes On Pipe Length and Elevaon
3. Connecon Instrucons Refrigerant Piping
Wiring
1. Outdoor Uint Wiring
2. Indoor Uint Wiring
3. Specific wiring method
4. Control Logic
5. LED DISPLAY
6. DIP Switch Definions
Air Evacuation
1. Evacuaon Instrucons
2. Note on Adding Refrigerant
Test Run
1. Before Test Run
2. Test Run Instrucons

Read Safety Precautions Before Operation and Installation
The seriousness of potenal damage or injuries is classified as either a WARNING or CAUTION.
Incorrect installation due to ignoring instructions can cause serious damage or injury.
WARNING
This appliance can be used by children aged from 8 years and above and persons with reduced
This appliance is not intended for use by persons(including children) with reduced physical, sensory
or mental capabilies, or lack of experience and knowledge, unless they have been given supervision
or instrucon concerning use of the appliance by a person responsible for their safety. Children
should be supervised to ensure that they do not play with the appliance.
physical, sensory or mental capabilies or lack of experience and knowledge if they have been given
supervision or instrucon concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.
WARNINGS FOR PRODUCT USE
•
If an abnormal situaon arises (like a burning smell), immediately turn off the unit and disconnect
the power. Call your dealer for instrucons 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 rotang at high speeds.
•
Do not
use flammable sprays such as hair spray, lacquer or paint near the unit. This may cause
fire or combuson.
•
Do not
operate the air condioner in places near or around combusble gases. Emied gas may
collect around the unit and cause explosion.
•
Do not
•
•
Do not
expose your body directly to cool air for a prolonged period of me.
•
•
•
If the air condioner is used together with burners or other heang devices, thoroughly venlate
the room to avoid oxygen deficiency.
Safety Precautions
Do not
allow children to play with the air condioner. Children must be supervised around the
unit at all mes.
operate your air condioner in a wet room such as a bathroom or laundry room. Too
much exposure to water can cause electrical components to short circuit.
In certain funconal environments, such as kitchens, server rooms, etc., the use of specially
designed air-condioning units is highly recommended.
Improper installaon, adjustment, alteraon, service or maintenance can cause property damage,
personal injury or loss of life. Installaon and service must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the gas supplier.
WARNING
This symbol indicates the possibility
of personnel injury or loss of life.
CAUTION
This symbol indicates the possibility of
property damage or serious consequences.
Safety
Precautions
 Page 4

CAUTION
• Turn off the air condioner and disconnect the power if you are not going to use it for a long me.
• Turn off and unplug the unit during storms.
• Make sure that water condensaon can drain unhindered from the unit.
• Do not operate the air condioner 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.
•
•
Do not allow the air condioner to operate for long periods of me with doors or windows open,
or if the humidity is very high.
ELECTRICAL WARNINGS
• Only use the specified power cord. If the power cord is damaged, it must be replaced by the
manufacturer , its service agent or similarly qualified persons in order to avoid a hazard.
• Keep power plug clean. Remove any dust or grime that accumulates on or around the plug. Dirty
plugs can cause fire or electric shock.
•
•
•
•
•
•
•
Do not pull power cord to unplug unit. Hold the plug firmly and pull it from the outlet. Pulling
directly on the cord can damage it, which can lead to fire or electric shock.
Do not modify the length of the power supply cord or use an extension cord to power the unit.
Do not share the electrical outlet with other appliances. Improper or insufficient power supply
can cause fire or electrical shock.
If connecng power to fixed wiring, an all-pole disconnecon device which has at least 3mm
clearances in all poles, and have a leakage current that may exceed 10mA, the residual current
device(RCD) having a rated residual operang current not exceeding 30mA, and disconnecon
must be incorporated in the fixed wiring in accordance with the wiring rules.
For all electrical work, follow all local and naonal wiring standards, regulaons, and the
Installaon Manual. Connect cables ghtly, and clamp them securely to prevent external forces
from damaging the terminal. Improper electrical connecons can overheat and cause fire, and may
also cause shock.
All electrical connecons must be made according to the Electrical Connecon
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 connecon
points on the terminal to heat up, catch fire, or cause electrical shock.
The product must be properly grounded at the me of installaon, or electrical shock may occur.
TAKE NOTE OF FUSE SPECIFICATIONS
The air condioner’s circuit board (PCB) is designed with a fuse to provide overcurrent protecon.
The specificaons of the fuse are printed on the circuit board ,examples of such are T5A/250VAC and
T10A/250VAC.
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 protecve clothing.
Safety
Precautions
 Page 5
• Do not
clean the air condioner with combusble cleaning agents. Combusble cleaning agents
can cause fire or deformaon.
CLEANING AND MAINTENANCE WARNINGS
• Turn off the device and disconnect the power before cleaning. Failure to do so can cause electrical
shock.
• Do not
clean the air condioner with excessive amounts of water.

Note
MODEL
PRESSURE
The allowed static pressure range of the air condioner on site is 0-200Pa.
Test static pressure
12-24K
25Pa 37Pa 50Pa
30-36K 48-60K
Safety
Precautions
 Page 6
WARNINGS FOR PRODUCT INSTALLATION
1. Installaon must be performed by an authorized dealer or specialist. Defecve installaon can
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.
cause water leakage, electrical shock, or fire.
2. Installaon must be performed according to the installaon instrucons. Improper installaon
can cause water leakage, electrical shock, or fire.
(In North America,installaon must be performed in accordance with the requirement of NEC
and CEC by authorized personnel only.)
3.
Contact an authorized service technician for repair or maintenance of this unit. This appliance
shall be installed in accordance with naonal wiring regulaons.
4.
Only use the included accessories, parts, and specified parts for installaon. Using non-standard
parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.
5.
6.
Install the unit in a firm locaon that can support the unit’s weight. If the chosen locaon cannot
support the unit’s weight, or the installaon is not done properly, the unit may drop and cause
serious injury and damage.
7.
8.
9.
10.
11.
12.
Do not turn on the power unl all work has been completed.
When moving or relocang the air condioner, consult experienced service technicians for
disconnecon and reinstallaon of the unit.
How to install the appliance to its support, please read the informaon for details in "indoor unit
installaon" and "outdoor unit installaon" secons .
For units that have an auxiliary electric heater, do not install the unit within 1 meter (3 feet) of
any combusble materials.
Do not install the unit in a locaon that may be exposed to combusble gas leaks. If combusble
gas accumulates around the unit, it may cause fire.
Install drainage piping according to the instrucons in this manual. Improper drainage may
cause water damage to your home and property.
Note about Fluorinated Gasses(Not applicable to the unit using R290 Refrigerant)
1.
This air-condioning unit contains fluorinated greenhouse gasses. For specific informaon 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)
.
2. Installaon, service, maintenance and repair of this unit must be performed by a cerfied
technician.
3. Product uninstallaon and recycling must be performed by a cerfied technician.
4. For equipment that contains fluorinated greenhouse gases in quanes of 5 tonnes of CO2
equivalent or more, but of less than 50 tonnes of CO2equivalent, If the system has a leak-
detecon system installed, it must be checked for leaks at least every 24 months.
5. When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.

Disposal Guidelines
This appliance contains refrigerant and other potenally hazardous materials. When disposing of
this appliance, the law requires special collecon and treatment. Do not dispose of this product as
household waste or unsorted municipal waste.
When disposing of this appliance, you have the following opons:
• Dispose of the appliance at designated municipal electronic waste collecon facility.
• When buying a new appliance, the retailer will take back the old appliance free of charge.
• The manufacturer will take back the old appliance free of charge.
• Sell the appliance to cerfied scrap metal dealers.
Special notice
Disposing of this appliance in the forest or other natural surroundings endangers your health and is bad
for the environment. Hazardous substances may leak into the ground water and enter the food chain.
Correct Disposal of This Product
(Waste Electrical & Electronic Equipment)
This marking shown on the product or its literature, indicates that waste electrical and
eletrical equipment should not be mixed with general household waste.
Safety
Precautions
 Page 7

NOTE: Room relave humidity less than 80%. If the air condioner operates in excess of this
figure, the surface of the air condioner may aract condensaon. Please sets the vercal air
flow louver to its maximum angle (vercally to the floor), and set HIGH fan mode.
Room
Temperature 62°F-90°F(17°C-32°C ) 32°F-86°F
(0°C-30°C) 50°F-90°F (10°C-32°C)
Outdoor
Temperature
64°F-109°F (18°C-43°C)
19°F-75°F
(-7°C-24°C )
52°F-109°F (11°C-43°C)
19°F-109°F (-7°C-43°C)
(For models with low-temp cooling systems) 64°F-109°F (18°C-43°C)
64°F-126°F (18°C-52°C)
(For special tropical models) 64°F-126°F (18°C-52°C) (For special tropical models)
COOL mode HEAT mode DRY mode
COOL mode HEAT mode DRY mode
Room Temperature (17°C - 32°C)
62°F - 90°F 32°F - 86°F
(0°C - 30°C)
50°F - 90°F
(10°C - 32°C)
Outdoor
Temperature
32°F - 122°F
(0°C - 50°C)
5°F - 75°F
(-15°C - 24°C)
32°F - 122°F
(0°C - 50°C)
32°F - 126°F
(0°C - 52°C)
(For special
tropical models)
32°F - 126°F
(0°C - 52°C)
(For special
tropical models)
5°F - 122°F
(-15°C - 50°C)
(For models with
low temp. cooling
systems.)
Indoor Unit Parts And Major Functions
Unit Parts Operating Conditions
Use the system under the following temperatures for safe and
effecve operaon. If the air condioner is used under different
condions, it may malfuncon or become less efficient.
Air outlet
Air inlet
FOR OUTDOOR UNITS WITH AUXILIARY ELECTRIC HEATER
Inverter Split Type
When outside temperature is below 32°F(0°C), we strongly
recommend keeping the unit plugged in at all me to ensure
smooth on going performance.
Fixed-speed Type
Indoor Unit
Parts And
Major Functions
 Page 8

To further optimize the performance of your unit, do the following:
• Keep doors and windows closed.
• Limit energy usage by using TIMER ON and TIMER OFF funcons.
• Do not block air inlets or outlets.
• Regularly inspect and clean air filters.
Energy Saving Tips
• DO NOT set the unit to excessive temperature levels.
• While cooling, close the curtains to avoid direct sunlight.
• Doors and windows should be kept closed to keep cool or warm air in the room.
• DO NOT place objects near the air inlet and outlet of the unit.
• Clean the air filter every two weeks.
• Adjust louvers properly and avoid direct airflow.
Features
Refrigerant Leak Detection System
(some models)
In the event of a refrigerant leak, the LCD screen
will display “EL0C” and the LED indicator light will
flash.
Closing curtains during heating also
helps keep the heat in
Doors and windows should be kept
closed
Indoor Unit
Parts And
Major Functions
NOTE:
1. Under normal working condions, the switch,
wind speed and temperature can not be adjusted
by remote control.
2. Requirements of wire controller:
Control AXU funcon for live heang
The default temperature of the first power-on is
set to 16 degrees for refrigeraon and 30 degrees
for heang. When the temperature stops, the
temperature is set at the room temperature at that
me.
 Page 9

Care and Maintenance
If using a vacuum cleaner,
the inlet side should face
the vacuum.
If using water, the inlet side
should face down and away
from the water stream.
Air filter
cover plate
Air filter
Care and
Maintenance
 Page 10
BEFORE CLEANING OR
MAINTENANCE
ALWAYS TURN OFF YOUR AIR CONDITIONER
SYSTEM AND DISCONNECT ITS POWER SUPPLY
BEFORE CLEANING OR MAINTENANCE.
CAUTION
Only use a so, dry cloth to wipe the unit clean.
If the unit is especially dirty, you can use a cloth
soaked in warm water to wipe it clean.
• Do not use chemicals or chemically treated
cloths to clean the unit
• Do not use benzene, paint thinner, polishing
powder or other solvents to clean the unit.
They can cause the plasc surface to crack
or deform.
•
•
Do not use water hoer than 104°F (40°C)
to clean the front panel. This can cause the
panel to deform or become discolored.
DO NOT wash the unit under running water.
Doing so creates an electrical hazard.
Clean the unit using a damp, lint-free cloth
and neutral detergent. Dry the unit with a
dry, lint-free cloth.
• Contact an authorized service technician for
repair or maintenance. Improper repair and
maintenance may cause water leakage,
electrical shock, or fire, and may void your
warranty.
• DO NOT substute a blown fuse with a
higher or lower amperage rang fuse, as this
may cause circuit damage or an electrical fire.
• Make sure the drain hose is set up according
to the instrucons. Failure to do so could
cause leakage and result in personal property
damage, fire and electric shock.
• Make sure that all wires are connected
properly. Failure to connect wires according
to instrucons can result in electrical shock
or fire.
Cleaning Your Indoor Unit
2. Remove the air filter.
3. Clean the air filter by vacuuming the surface or
washing it in warm water with mild detergent.
1. Remove filter cover plate.
How To Clean The Air Filter
The filter prevents dust and other parcles from
entering the indoor unit. Dust buildup can reduce
the efficiency of the air condioner. For opmum
efficiency, clean the air filter every two weeks or
more frequently if you live in a dusty area.
Replace the filter with a new one if it’s heavily
clogged and cannot be cleaned.
NOTE: In households with animals, you will have
to periodically wipe down the grille to prevent
animal hair blocking airflow.
This product filter is only used for energy efficiency
sampling test, the user needs to use a filter that
meets the requirements of UL900.
WARNING: DO NOT REMOVE OR
CLEAN THE FILTER BY YOURSELF
Removing and cleaning the filter can be dangerous.
Removal and maintenance must be performed by
a cerfied technician.