Cooper & Hunter CHV5 Series User manual

CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
R410A/50/60Hz

CONTENTS
PRODUCT................................................................................................................ 2
1 PRODUCT LIST ..............................................................................................................................2
2 PRODUCT FEATURES.....................................................................................................................2
3 SPECIFICATIONS............................................................................................................................4
4 PRODUCT CAPACITY CORRECTION...............................................................................................5
5 PRINCIPLE OF OPERATION............................................................................................................7
CONTROL .............................................................................................................. 10
1 UNITS CONTROL.........................................................................................................................10
2 WIRED CONTROLLER..................................................................................................................18
3 REMOTE CONTROLLER...............................................................................................................44
INSTALLATION .......................................................................................................49
1 TOOLS AND EQUIPMENT FOR INSTALLATION AND MAINTENANCE ..........................................49
2 INSTALLATION KEY POINTS AND IMPORTANCE.........................................................................51
3 INSTALLATION MATERIALS SELECTION.......................................................................................53
4 INSTALLATION OF OUTDOOR UNIT............................................................................................56
5 INSTALLATION OF INDOOR UNIT ...............................................................................................60
6 EXCURSUS...................................................................................................................................70
MAINTENANCE......................................................................................................73
1 TROUBLE TABLE..........................................................................................................................73
2 FLOW CHART OF TROUBLE SHOOTING ......................................................................................77
3 POWER DISTRIBUTION...............................................................................................................92
4 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS ....................................................96
5 COMMON MAINTENANCE .......................................................................................................112
6 EXPLODED VIEW OF UNIT AND PARTS LIST..............................................................................117

1 PRODUCT
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
PRODUCT

PRODUCT 2 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
PRODUCT
1 PRODUCT LIST
1.1 Outdoor unit
Model
Product Code
Cooling
Capacity(kW)
Heating
Capacity(kW)
Refrigerant
Appearance
CHV-5S224SNMX
CN850W0200
22.4
25
R410A
CHV-5S250SNMX
CN850W0210
25
28
CHV-5S280SNMX
CN850W0190
28
30
2 PRODUCT FEATURES
C&H CHV5 Compact series All DC Inverter VRF outdoor units (R410A) are based on C&H DC Inverter
compressor technology and special designed for the residential apartments, commercial offices and super markets.
And the capacity range of CHV5 Compact series outdoor units is 22.4 kW, 25 kW and 28 kW.
DC Invertertechnology
Selects the superior high-pressure chamber two-spod compressor, independent research and development new
generation - perfect DC inverter drive technology, special custom dual-core DSPchip, single chip and

3 PRODUCT
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
dual-frequency intergrated drive technology, and parallel processing ability increase 100%. By using G-MATRIK
technology, the harmonic wave of drive current is less, the torque ripple is small, and the efficiency is high and
vibration noise is low. Adopts independent R&D high frequency and weak magnetic technology to make the
inverter compressor run in wide frequency of 15~120Hz and wied voltage of 240~450V and it has good speed
regulation performance,wide speed range and is more comfortable.
The bionic super-quiet fan blade
Adopting aerodymamics and the theory of bionics research achivements, the unique pits on the leading edge of
the blade effectively destroy the formation of the leading edge vortex and prevent it from falling off. The pits and
the separation vertex on the leading edge are broken into small ones, which reduces 2dB of broadband noise and
improves sound quality. At the same time it reduces the load of the fan motor, which makes the fan run more
efficiently.
New generation CAN bus communication
Due to the latest communication method -interference capability is
stronger and the control on indoor units is more accurate, with higher reliability. When a single indoor unit or
outdoor unit quit the communication automatically, there is no impact on the network. Multiple means of
communication, sataus information of the units in the network can be feed back immediately. The use rate of CAN
bus is improved 10 times of 485 communication. The communication between indoor and outdoor unit is up to
20Kbps, which has increased by 100% and date exchange is faster. Multi-group network, it is easy to extend to the
new device (any equipment conforms to CAN protocol) and realize the non-polarity installation. The
communication distance is up to 1500 m.
New oil return technology
C&H active balancing oil return technology provides a new method for controlling the oil level of parallel
compressor, which makes the oil level automatically adjust near the hole for balancing oil when the compressor is
runnig to prevent the compressor from running in short of oil for long time and avoid the damage. At the same time
it can avoid oil hammer for the oil level is too high.
Long distance refrigerant pipe
The longest piping length is up to 100 m, the longest equivalent length is up to 125 m. The drop between
indoor units is up to 15 m. When the outdoor unit is above the indoor unit, the biggest drop is up to 50 m. When the
outdoor unit is under the indoor unit, the drop is up to 40 m.
Free design andeasy installaiton
With four-way airflow design, humanized base, simple piping and wiring system, sideward airflow design,the
installation of the unit can be against the wall and more easy and convenience, which greatly reduce the cost of
transporation and installation.
Perfect malfunction protection
The function for malfunction protection is perfect, which includes over current protection, high pressure
protection, low pressure protection, exhaust temperature protection, phase lacking protection, voltage protection,
communication malfunction, temperature sensor malfunction to ensure the reliable operation for the unit.

PRODUCT 4 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
Abundant indoor units
One outdoor unit of CHV5 Compact multi VRF matches different kinds and different capacity of indoor units.
Acording to the use and decoration features of the room, the types of units can be chose includes high static
pressure duct, super slim duct, four-way cassette, one-way cassette,wall-mounted and so on. The units can be
widely used in different size and different uses of the modern household, commercial offices as well as upscale
villas, apartments, penthouse and so on.
3 SPECIFICATIONS
3.1 Specifications
Model
CHV-5S224SNMX
CHV-5S250SNMX
CHV-5S280SNMX
Product Code
CN850W0200
CN850W0210
CN850W0190
Cooling Capacity
KW
22.4
25
28
Heating Capacity
KW
25
28
30
Air Flow Volume
m3/h
9000
9000
9000
Sound Pressure
Level
dB(A)
60
61
61
R410A
Filling Amount
kg
7.2
7.6
7.6
EER
W/W
3.34
3.38
3.37
COP
W/W
3.82
3.81
3.68
Phases
-
3
3
3
Rated Voltage
V
380V
380V
380V
Rated Frequency
Hz
50/60
50/60
50/60
Cooling Power
Input
kW
6.70
7.40
8.30
Heating Power
Input
kW
6.54
7.35
8.15
Rated Power Input
kW
8.50
11.30
12.10
Demensions of Unit（mm）
（Width×Depth×Height）
1098×399×1584
1098×399×1584
1098×399×1584
Demensions of Package（mm）
（Width×Depth×Height）
1183×505×1785
1183×505×1785
1183×505×1785
Compressor
QXAS-D32zX050
×2
QXAS-F428zX050B
×2
QXAS-F428zX050B
×2
Moisture Protection
IPX4
IPX4
IPX4

5 PRODUCT
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
Connecting
pipe
Gas
Pipe
mm
22
22
22
Liquid
Pipe
mm
9.52
9.52
9.52
Connection
Method
Brazing Connection
Brazing Connection
Brazing Connection
Net Weight
kg
175
185
185
Note:
①The technical parameters are changed along with the products’ improvement; please refer to the nameplate
of the unit for actual data.
②Noise is tested in the semi-anechoic room, so it should be slightly higher in the actual operation due to
environmental change.
③Rated conditions:
Cooling: Indoor air temperature27℃(81℉)DB/19℃(66.6℉)WB
Outdoor air temperature35℃(95.4℉ )DB/24℃(75.6℉)WB
Heating: Indoor air temperature20℃(68℉)DB/15℃(59℉)WB
Outdoor air temperature7℃(44.6℉ )DB/6℃(42.8℉)WB
3.2 Operating range
Cooling Operation
Outdoor Ambient Temperature: 10℃~52℃
Heating Operation
Outdoor Ambient Temperature: -20℃~27℃
4 PRODUCT CAPACITY CORRECTION
4.1 Correction factor of indoor and outdoor temperature
a. Correction factor of cooling capacity

PRODUCT 6 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
b. Correction factor of heating capacity
4.2 Correction factorof pipe lengthand height difference
(1) Symbol description:
Hp: Height difference in case indoor unit is below outdoor unit (m);
Hm: Height difference in case indoor unit is above outdoor unit (m);
L: Length of one-way equivalent pipe.
(2) Below table shows the capacity variance ratio for 100% full load in standard working condition (thermostat

7 PRODUCT
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
setting is 16℃for cooling and 30℃for heating).
a.Varianceratioofcoolingcapacity
25
0.97
Hm(m)
20
10
Hp(m)
1.0
10
10
20
4020 30 50 60 L(m) 8070 90 100
0.95
0.92
0.90
0.85 0.87
b Variance ratio of heating capacity
20
10
Hm(m) 10
10
Hp(m)
20
25
20 30 5040 60
1.0
70 9080 100 L(m)
0.97 0.92 0.9
Under heating operation, it may frostwhen there is snow on the outdoor heat exchangers or the outdoor
temperature is below 6℃ , which will reduce the heating capability of the unit.
5 PRINCIPLE OF OPERATION
5.1 SystemFlowchart
As the following system flowchart, princilple of operation is:
Conneting to power supply, the uint stars to work.In cooling, the low-temperature and low-pressure refrigerant
gas from each indoor heat exchanger will be merged and inhaled by the compressor and then become
high-temperature and high-pressure gas, which will later be discharged into outdoor heat exchangers. By
exchanging heat with outdoor air, refrigerant will turn to liquid and flow to each indoor unit via Y-type branch or
manifold. Pressure and temperature of the refrigerant will then be lowered by throttle elements before it flows into
indoor heat exchangers. After exchanging heat with indoor air, refrigerant wil become low-temperature and
low-pressure gas again and repeat the circulation so as to realize the cooling effect. In heating, 4-way valve will be
energized to make refrigerant circulate in a reverse direction of cooling. Refrigerant will release heat in indoor heat
exchangers (electric heating elements will also work under certain circumstance and release heat) and absorb heat
in outdoor heat exchangers circularly so as to realize the heating effect.

PRODUCT 8 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
Electronic expansion valve
Heat exchanger
Gas-liquid separator
Compressor1
Oil balance
Indoor side
Indoor electronic expansion valve
Indoor electronic expansion valve
Stop valve
Heat
exchangeer
Heat
exchangeer
Oil return vavle
Compressor2
Oil balance
Oil separato
Outdoor side
Heating
Cooling
4-way vavle

0 900 CONTROL
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
CONTROL

CONTROL 0 10 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
CONTROL
1 UNITS CONTROL
1.1 Mentality of Units’control
1.1.1 
Air conditioning units can be divided into indoor unit and outdoor unit. Amaximum of 16 sets of indoor units
can be connected to an outdoor unit. 2-core (3-core pin header) communication cable is used for the connection
between indoor unit and outdoor unit. Indoor unit is connected to display board via 4-core communication cable. In
engineering installation, address dial-up of the display board and the mainboard of indoor unit shall be dialed. The
address dial-up of the mainboard of indoor unit must be identical with that of the display board of the same indoor
unit. Address dial-up of different indoor unit must vary. Multi VRF indoor unit is applicable to all digital or inverter
outdoor units.
Controller of outdoor unit falls into two categories in terms of its function, i.e. main control system and
inverter drive control system
1.1.2 Interpretation on the schematic diagram
（1）Main control system
A. Functions: main control system shall be connected to indoor unit through 2-core (3-core pin header)
communication cable in order to receive start or stop commands, mode, setting temperature and ambient
temperature from indoor unit, determine operation mode of outdoor unit, and through calculation based on capacity,
decide proper running frequency which shall be sent to the drive control system through 2-core (3-core pin header)
communication cable. Fan speed shall be regulated according to system pressure. Real-time monitoring of

0 1 1 00 CONTROL
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
temperature sensors, operation state and protection of unit shall be performed to ensure normal and stable operation
of the whole system. Protection codes of outdoor unit shall be displayed on the LED on the main control board
when failure occurs. When drive is at fault, E5 shall be displayed on the display board of indoor unit, and specific
failure type shall be indicated on the LED on the main control board of outdoor unit.
B. Input and output controlled variables
Sensors include ambient temp. sensor, tube-inlet temp. sensor, tube-middle temp. sensor, tube-outlet temp.
sensor, compressor exhaust temp. sensor, compressor casing top temp. sensor, high pressure sensor and low
pressure sensor.
Switch protection: high pressure protection, over-current protection
Output control objects: fan frequency, compressor heat tape (controlled by drive board), compressor AC
contactor (3-phase, controlled by drive board), gas bypass valve, 4-way valve, solenoid valve A, oil equilibrium
valve, liquid bypass valve and capillary solenoid valve.
C. 485 communication interface: indoor unit communication network and adaptor board CN1 shall be
connected to the mainboard of indoor unit through 2-core (3-core pin header) communication cable; drive
communication network and the mainboards CN11~CN14 of outdoor unit shall be connected to the drive board
through 2-core (3-core pin header) communication cable.
（2）Drive control system
Three-phase power unit:
M
Provide DC
L1, L2, L3, N
Reactor
Communication

CONTROL 0 12 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
Functions of various modules:
A Filter plate: one of the two key functions is to filter and eliminate power interferences and ensure
anti-interference capability of the unit even in a rugged power supply environment; the other one is to suppress
interferences from power supply in order to prevent the operation of the unit from affecting other appliances such
as TV. Because inverter unit works in a special way that is relatively sensitive to interferences, filter plate is
normally arranged. Because 3-phase power supply is used for the unit, 3-phase filter plate that uses 3-stage filtering
mode shall be employed. Input terminals of 3-phase filter plate are respectively AC-L1, AC-L2, AC-L3 and N, and
corresponding output terminals are respectively L1-OUT, L2-OUT, L3-OUT and N-OUT.
B Drive board is a key part of control system. Receiving commands from the main control board, the drive
board can transform 380V, 50Hz, 3-phase commercial power into AC power with adjustable amplitude and
frequency, capable to drive compressor.
1.2 Operation Flowchart of the unit
1.2.1 Operation Flowchart of the Indoor Unit
Start Indicating Light Is ON
Start/Stop Display The Last Setting s Of Air
Stop
Initialization Of electronic Expansion Valve
Connecting To Power Supply
Volume:Air Supply Direction
Start Indicating Light OFF
Is The Protecting Start Display:Flickering
Abnormality Code Display
Yes
Start
Is The Start Indicating Press The Start / Stop Switch
Yes
No
No
Start Indicating Light ON Air
Volume Setting Display
Displaying Air Supply Direction
Setting Display Displaying
Temperature Setting Display
Displaying
Start Display : OFF Abnormal
Mode Display
Air Supply Or Temperature
Cooling Or Heatig?
Air Supply Blower : Stop
Electronic Expansion
Guide Louve r : Stop
Heating
Operation Air
Cooling
Operation Air Supply
Operation
Air Supply
Temperature
Adjustment
Cooling Heating
A

0 1300 CONTROL
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
◆Cooling Operation
ThereIsNot
GuideLouversSwing
ThereIs
InTheProcessOfPreventingRestart
Operation?(3Minutes)
Yes
No
No
TemperatureAdjustment?
A
CoolingOperation
FanMotor:Operation
GuideLouver
ElectronicExpansionValve
CapacityControl ElectronicExpansion
Valve:Close
FanMotor:Stop
Yes
No
◆Air Supply Operation
No
Guidelouverisswaying
Yes
A
GuideLouver
Electronicexpansion
valve:controlledinair
supplymode
Fan:runningatsetspeed
Airsupplyrunning

CONTROL 0 14 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
◆Heating Operation
ThereIsNot
GuideLouversSwing
ThereIs
InTheProcessOfPreventingRestart
Operation?(3Minutes)
No
No
TemperatureAdjustment?
A
GuideLouver
ElectronicExpansionValve
:CapacityControl
ElectronicExpansion
Valve:Close
FanMotor:Stop
Yes
No
InTheOperationOf
Defrosting?
ElectronicExpansionValve
:CloseDefrostingControl
FanMotor:Stop
InTheProcessOf
PreventingColdAir?
FanMotor:AsPerSetAir
SupplySpeed
No
FanMotor:
Stop
Yes
Yes
HeatingOperation

0 1500 CONTROL
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
◆Dry Operation
Dryingrunning
No
Guidelouverisswaying
Yes
Isrestartbeingavoided？(3minutes)
No
No
Temperatureregulation?
A
GuideLouver
Electronicexpansionvalve:
capacitycontrol Electronicexpansion
valve:stop
Fan:stop
Yes
No
Yes
Fan:runningatlowspeed
◆Cooling Operation
Coolingrunning
Iscompressorbeing
protected?
No
B
Isstartupbeinginitialized?
4-wayvalve:stop
Outdoorfan:coolingcontrol
mode
Outdoorelectronicexpansion
valvefullyopen:
Compressor:capacitycontrol
Yes
Yes
No
4-wayvalve:stop
Outdoorfan:protectioncontrol
Outdoorelectronicexpansion
valve:stop
Compressor:protectioncontrol
4-wayvalve:stop
Outdoorfan:coolingcontrol
mode
Outdoorelectronicexpansion
valve:fullyopen
Compressor:initialized

CONTROL 0 16 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
1.2.2 Operation Flowchart of the Outdoor Unit
The unit is powered on
Temperature regulation
Is restart being avoided? (3 minutes)
No
No
Cooling or heating?
B
Air supply or temperature
regulation?
Yes
No
The electronic expansion valve:
initialized
Is protection device
operating?
Is abnormality Indicator of outdoor
unit is bright?
Abnormality indicator of
outdoor unit: bright
Press the run/stop switch
Yes
Abnormality indicator of
outdoor unit: bright
Heating runningCooling running
Cooling Heating 4-way valve: On while
heating Off while cooling and
air supply
Outdoor fan: stop
Outdoor electronic expansion
valve: stop
Compressor: stop
Yes
Air supply

0 1700 CONTROL
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
◆Heating Operation
No
B
Isstartupbeinginitialized?
4-wayvalve:open
Outdoorfan：heatingcontrol
mode
Compressor：capacitycontrol
Electronicexpansionvalveof
outdoor unit：capacitycontrol
Yes
Yes
No
4-wayvalve:open
Outdoorfan：protection
controlmode
Compressor：protection
control
Electronicexpansionvalveof
outdoor unit：capacitycontrol
4-wayvalve:reverse
Outdoorfan：defrostcontrol
Compressor：initialdefrost
control
Electronicexpansionvalve
of outdoor unit：fullyopen
Heatingrunning
Isdefrostrunning?
Iscompressorbeing
protected?
4-wayvalve:open
Outdoorfan：heatingcontrol
mode
Compressor：initialized
Electronicexpansionvalveof
outdoor unit：capacitycontrol
Yes
No

CONTROL 0 18 0
CHV5 COMPACT MULTI VRF UNIT
SERVICE MANUAL
2 WIRED CONTROLLER
2.1 Control panel
1) LCD Display Instruction