Cooper & Hunter GRS-Cm18/A-M User manual

CIRCULATING AIR SOURCE WATER
HEAT PUMP SERVICE MANUAL

CONTENTS
PRODUCT....................................................................................................................2
1 MODELS LIST.............................................................................................................................2
2 NOMENCLATURE......................................................................................................................3
3 FUNCTION ..................................................................................................................................3
4 PRODUCT DATA.........................................................................................................................3
4.1 Product Data at Rated Condition........................................................................................3
4.2 Operation Range.................................................................................................................5
4.3 Electrical Data....................................................................................................................5
5 PIPING DIAGRAM......................................................................................................................6
UNITS CONTROL......................................................................................................8
1 OPERATION FLOWCHART....................................................................................................... 8
2 MAIN LOGIC...............................................................................................................................9
3 WIRED REMOTE CONTROLLER...........................................................................................10
3.1 Dimension........................................................................................................................ 10
3.2 Function ...........................................................................................................................10
3.3 Installation........................................................................................................................12
4 CONTROL WIRING DESIGN...................................................................................................13
INSTALLATION .......................................................................................................15
1 UNITS INSTALL........................................................................................................................15
1.1 Installation Positions........................................................................................................ 15
1.2 Matters needAttention.....................................................................................................15
1.3 Dimension Data................................................................................................................ 16
1.4 Installation Clearance Data .............................................................................................. 17
1.6 Installation of Water Level Switch................................................................................... 21
2 ELECTRIC WIRING WORK.....................................................................................................23
2.1 Wiring Principle............................................................................................................... 23
2.2 Electric Wiring Design..................................................................................................... 23
2.3 Specification of Power Cord & Air Switch...................................................................... 26
UNITS MAINTENANCE..........................................................................................29
1 ERROR CODE LIST.................................................................................................................. 29
2 FLOW CHART OF TROUBLESHOOTING ............................................................................. 32
3 WIRING DIADRAM..................................................................................................................39
4 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS....................................42
5 EXPLODED VIEWS AND PART LIST.....................................................................................49

C&H COMMERCIALAIR CONDITIONERS CIRCULATING AIR SOURCE WATER HEATER
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PRODUCT

CIRCULATING AIR SOURCE WATER HEATER PRODUCT
2
PRODUCT
1 MODELS LIST
Model
Refrigerant Model Name
Nominal
Capacity
(kW)
Power Supply
(V,Ph,Hz) Appearance
GRS-Cm18/A-M 18
GRS-Cm36/A-M 36
R22
GRS-Cm65/A-M 65
380~415V,
3Ph,50Hz
Note:1Ton =12000Btu/h = 3.517kW

CIRCULATING AIR SOURCE WATER HEATER PRODUCT
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2 NOMENCLATURE
GRS - Cm 1
8
/A-M
12345
NO. Description Options
1 Air to water heat pump -
2 Circulation module -
3 Nominal Capacity 18=18kW 36= 36kW
65=65 kW
4 Design number description A
5 Voltage M=380~415V,3Ph,50Hz
3 FUNCTION
Function Description
High efficiency and energy saving
The energy consumption is one fourth of electric water heater and one
third of gas water heater of the same capacity.
Safe and Reliable
Electric energy drives refrigerant in air source heat pump water heater
.
The refrigerant absorbs heat energy from air which is used for heating
water, so the water-electricity isolation is completely realized. Potentia
l
fault like electric leakage, gas poisoning, explosion and dry
combustion for gas water heater will never happen on air source heat
pump water heater. It is safer and more reliable than the conventional
water heater.
Easy Installation and Maintenance
The unit can be installed on balcony, rooftop, yard, basement and so
on, no special machine room needed. It can be installed in any place
without direct sunlight. Intelligent self-diagnose system is provided fo
r
easy maintenance.
All-day Operation and Wide Application
Heat pump water heater makes use of sensible heat and hidden heat in
the air as low-temperature heat source, so it can continuously supply
hot water all day, no matter in which season or what the weather is like
.
It is designed to work at wide ambient temperature range from -7 to
43 .
Intelligent Control
Microchip control, easy operation interface, and various kinds of
history operation data can be tracked.
Multi-modular network can control up to 16 host units; parameters of
each unit can be freely set
Daily timer on/off function and complete safety ensure reliable
operation.
4 PRODUCT DATA
4.1 Product Data at Rated Condition
Models GRS-Cm18/A-M GRS-Cm36/A-M GRS-Cm65/A-M

CIRCULATING AIR SOURCE WATER HEATER PRODUCT
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kW 18 36 65
Btu/h 61416 122832 221780
Nominal Capacity Heating
RT 5.1 10.2 18.5
Power
Consumption Heating kW
4.5 8.7 14.5
Water outlet temp 55 -default./30-58 adjustable
Power Supply
3Ph, 380~415V,50Hz
Safeties High/Low pressure switch, compressor thermal protection, over current protection, lose of phase/anti-phase protection, antifreeze
protection, water flow switch
Type R22
Refrigerant Charge kg
4.0 4.2 × 28 × 2
Type
Hermetic scroll compressor
Compressor NO. 1 2 2
Type
Low-noise axial flow fan
Fan motor
NO. 2 2 2
Water flow
volume m
3
/h 3.1 6.0 11.2
Water
pressure
drop KPa 29 35 80
Water system
Water
in/out pipe inch 1’’/1’’ 1’’/1’’ 2’’/2’’
Height mm 1100 1460 1750
Width mm 410 530 800
Unit
Dimension Depth mm 1250 1850 1760
Height mm 1260 1457 1860
Width mm 450 556 900
Packing Dimension Depth mm 1270 2100 2020
Net/Gross Weights
kg
165/170 380/390 650/660
NOTE1
1. Rated condition: outdoor ambient temp. 20 DB/15 WB; initial temp. 15 ; final temp.
55 .
2. Using range: ambient temp. -743 .
3. Adjustable range of hot water: 30-58 .
4. Noise value is tested in semi-anechoic room, but it should be a little higher in actual running
environment due to the ambient and reflection change.
5. The parameters are subject to products improvement without prior notice. The spec on
nameplate should be final if there is any change.

CIRCULATING AIR SOURCE WATER HEATER PRODUCT
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4.2 Operation Range
Mode Range of Outdoor Temperature ( )
Heating -743
4.3 Electrical Data
Fan Motor
Compressor Outdoor
Total
Model Rated
Power
Supply NO
.
LRA
each
-A.
MR
C
each
-A
.
NO. MRC
-A.
MRC
-A.
NRC
-A.
GRS-Cm18/A-M
1 60 10.9 2 0.30
11.50
8.28
GRS-Cm36/A-M
2 60 10.9 2 0.30
23.80
17.18
GRS-Cm65/A-M
380~415V
3N350Hz
2 100 21.6 2 0.99
45.18
36.18
Notes:
LRA: Locked rotor amps (A)
MRC: Maximum running current (A)
NRC: Nominal running current (A)

CIRCULATING AIR SOURCE WATER HEATER PRODUCT
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5 PIPING DIAGRAM
Air source is a kind of low-grade energy which exists widely and can be equally supplied and
freely applied. Via heat pump circulation, it can potentially developed into a new kind of energy
saving and environment friendly technology with practical value.
Air source heat pump water heater according to heat pump principle will consume a part of
electric energy for compensation and obtain heat from low-grade energy (low-temperature air
source) around. The heat will be sent to condenser and released to high-temperature heat source to
generate hot water. With the same working principle as heat pump water heater, heat pump air
conditioner obtains heat from natural environment which will be supplied to indoor air. However,
heat pump water heater heats domestic water by this part of heat, so it’s EER is at least 2 times
higher than conventional electric water heater. Heat pump water heater is a kind of high efficiency,
energy saving and environment friendly product.
Heat pump unit usually consists of compressor, water side heat exchanger, air side heat exchanger,
throttling device, high/low pressure accumulator and so on. Air source heat pump water heater
consists of heat pump unit, insulated water tank, water pump, other relative pipeline valves, etc.

C&H COMMERCIALAIR CONDITIONERS CIRCULATING AIR SOURCE WATER HEATER
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CONTROL

CIRCULATING AIR SOURCE WATER HEATER CONTROL
8
UNITS CONTROL
1 OPERATION FLOWCHART

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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2 MAIN LOGIC
1). Control of Compressor
Operating condition of compressor-I.1
a0When T
out
≤T_set-ΔT(5 )-1, the compressor will start running.
b0When T
out
≥T_set, the compressor will stop running.
c0When T_set-ΔT(5 )-1 2T
out
2T_set, the previous running state will remain.
Operating condition of compressor-II.1
a0When T
out
≤T_set-ΔT(5 )-2, the compressor will start running.
b0When T
out
≥T_set-1, the compressor will stop running.
c0When T_set-ΔT(5 )-22T
out
2T_set-1, the previous running state will remain.
2). Control of Fan
In heating mode, after the compressor operates and the fan operates at high speed for 30s,
if outdoor ambient temperature Tambient≥31*, the running outdoor fan will operate at low speed.
if outdoor ambient temperature Tambient229*, the outdoor fan will resume running at high speed.
if outdoor ambient temperature 29*≤T
ambient
231*, the previous running state will remain.
3). Control of Defrosting
+Defrosting condition: the continuous running time, defrosting interval and pipe temperature all
reach the setting value of defrosting.
,Defrosting terminal condition: the setting time or pipe temperature reaches the setting value of
ending defrosting.
4). Antifreezing Operation
When outdoor ambient temperature T
ambient
≤1*, and T
antifreezing
≤3lasts for 30s, the water pump
will start up, and the electronic expansion valve will open to corresponding initial step. When
T
antifreezing
≤1, the fan will start up after the water pump operates for 240s. The compressor will start
up 15s later. As for dual compressors, only the one with shorter running time will start up.

CIRCULATING AIRSOURCEWATERHEATER INSTRALLATION
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3 WIRED REMOTE CONTROLLER
3.1 Dimension






 






3.2 Function
Operation View

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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





  






Constitution of Wired Controller
1Power indicator 13 Display of electric
auxiliary heater 25 Lock button
2ON/OFF button 14 Water level display o
f
water tank 26 Sleep button
(reserved)
3Receive window (reserved) 15 Error display 27 Increase button
4Water temp. / water temp. setting
/
display of inquiry of parameters 16 Defrosting display 28 Temp setting button
5Time/timer/error code 17 Terminal temp. display 29 Mode button
(reserved)
6Save setting display 18 Mark display o
f
multi-variable units 30 Decrease button
7Clean/ circulating heat
preservation 19 Inquiry button 31 Time/timer setting button

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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8Setting timer display 20 Auxiliary heat button 32 Save button
9Unit no. display 21 Fan speed button
(reserved) 33 Ok button
10 Selected icon display 22 Exit button 34 Selection o
f
single/multi
button
11 Lock display 23 Reset button
12 Auto anti-freezing running display 24 Swing button(reserved)
3.3 Installation
Screw hole for installation of manual controller
Cut off a part of sponge at the back of
the under plate during installation
Use tools to disassemble the wired controller instead of using hands directly, otherwise the clasp
may be broken. When disassemble the wired controller, screw off the clasp with minus screwdriver.
Then the panel of wired controller can be removed.

CIRCULATING AIRSOURCEWATERHEATER INSTRALLATION
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4 CONTROLWIRING DESIGN
Connection of wired controller and main board: connect interface CN2 of wired controller to interface
CN25 of main board with communication cable (4-core twisted pair).
Connection of main boards: connect interface CN15 to interface CN25 of another main board with
communication cable (4-core twisted pair).

C&H COMMERCIALAIR CONDITIONERS CIRCULATING AIR SOURCE WATER HEATER
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INSTALLATION

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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INSTALLATION
1 UNITS INSTALL
1.1 Installation Positions
The unit can be installed on balcony, rooftop, special platform or any other place where is
easy for installing the unit and able to stand the weight of the unit.
Install the unit in the place with well ventilation and smooth air discharge. Avoid influencing
other people due to air discharge and running noise.
Pay attention to air direction to avoid strong wind when the unit is placed on rooftop.
Have the unit far from strong heat source or heat steam, flammable gas or other air outlet of
other devices around it.
Set drain ditch or outlet near installation location for easy drainage.
1.2 Matters needAttention
1)
Check documents and accessories attached to the unit in accordance with package list.
Check model and specification according to attached documents.
Check the unit for damage or break and attached components and parts for completeness.
Check pipeline system to prevent refrigerant from leakage.
2). Strict inspection and test of each unit in factory are preformed to ensure performance and
quality. The user must be careful during installation and carrying to prevent damage of
control system and pipeline assembly.
Fork lifter or crane is suitable for carrying.
Canvas belt or steel rope (Φ10) with enough intension should be used for hoisting. Make
canvas belt or steel rope around base of unit and tighten it. In order to prevent damage to the
unit please put guard pad at contact place. Refer to the figure of the whole packaged unit.
During carrying the unit, keep inclination less than 30
0
and slightly carry or put them to
protect unit. Never strongly touch or forcibly pull the unit.
After carrying, remove pad plate for transportation and pad of compressor.
During installation, it is possible to fix unit on independent concrete foundation with
expansion bolts M12 or on the ground with steel bracket made of angle iron or box iron,
adding anti-vibration rubber pad with thickness above 25mm on the ground or rooftop and
keeping the unit level.
If the unit is out of lightning protection of buildings, lightning method should be conducted

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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in accordance with safety standard.
Foundation bolt
Rubber damping pad
Unit base
Hoisting method of unit Fixing method of foundation bolt
If there is any question during checking and inspection, please contact local dealer for help.
1.3 Dimension Data
Unit: mm
GRS-Cm18/A-M
GRS-Cm36/A-M

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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



GRS-Cm65/A-M




Models H A B C D
GRS-Cm36/A-M
1850 1460 530 1260 544
GRS-Cm65/A-M
1760 1750 710 1290 800
1.4 Installation Clearance Data
Unit: mm
GRS-Cm18/A-M
Installation of single unit

CIRCULATING AIR SOURCE WATER HEATER INSTRALLATION
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Air outlet
Air inlet




Demonstration L1 L2
L3
L4
Distance >500 >1000
>500
>1000
Installation of multiple units