Cooper & Hunter CH-HP3.5SWNK User manual

Owner's Manual
Models:
CH-HP3.5SWNK
Air Source Heat Pump Water
Heater

User Notice
Thanks for purchasing the C&H air source heat pump water heater. In order to
make the best use of this unit, prior to installation and operation, please read this
manual carefully, pay attention to the operation and maintenance instructions
provided in this manual, and keep it properly for future reference.
The air source heat pump water heater shall be installed and maintained by
skilled personnel, as it is an appliance that may be damaged or cause hazards when
improperly installed and maintained. Please contact the appointed local service
center for installation and maintenance, and strictly observe instructions in this
manual. C&H reserves the rights to interpret this manual which will be subject to
any change without prior notice.
The air source heat pump water heater is thermal storage water heater. When
using water, please open the cold water valve first, and then adjust the cold and
hot water volumes to a proper temperature to prevent scald. When you do not use
the heater for a short period in cold seasons, ensure that this unit is energized all
day long. When you do not use it for a long period, ensure that its water system is
drained to prevent cracking caused by cold weather. For any problem, please
contact the sales representative or the service center that can provide professional
services, including inspection, water drainage, water charging, and cleaning.
This air source water heater adopts DC inverter compressor, which is with
Standard, Save, Rapid and other kinds of operation modes. In order to save the
energy as much as possible, you are suggested to use the “Save” mode during daily
operation.
This manual serves as installation and use guides for vertical coil type air
source water heaters. For details about how to use the wired controller, refer to
the wired controller guide delivered with the unit.

Contents
1 Precautions for Use ...........................................................................1
2 Models and Technical Specifications ..............................................4
3 Working Principles and Advantages................................................7
3.1 Schematic Diagram of the Air Source Water Heater......................................................7
3.2 Brief Introduction to Principles.......................................................................................7
3.3 Advantages...................................................................................................................8
4 Installation Precautions...................................................................10
4.1 Importance Notes........................................................................................................10
4.2 Basic Requirements for Installation Sites ....................................................................10
5 Main Unit Installation....................................................................... 11
5.1 Location for Installing the Main Unit.............................................................................11
5.2 Space Requirement for Main Unit Installation and Installation Diagram .......................11
6 Installation of the Water Tank .........................................................13
7 Pipeline Connection.........................................................................14
7.1 Refrigerant Pipe Connection.......................................................................................14
7.2 Exhaust Methods........................................................................................................15
7.3 Water Pipe Connection...............................................................................................17
8 Installation Diagram of the Unit...................................................... 20
9 Wiring ................................................................................................21
9.1 Wire Layout.................................................................................................................21
9.2 Wire Connections........................................................................................................22
10 Wired Controller Installation.........................................................24
10.1 Requirements for Wired Controller Installation Locations ..........................................24
10.2 Wired Controller Installation ......................................................................................24
10.3 Rainproof Box Installation .........................................................................................26
11 Commissioning ..............................................................................28
12 Methods for Replenishing or Discharging Refrigerants............ 30
12.1 Refrigerant Replenishment........................................................................................30
12.2 Refrigerant Discharging.............................................................................................30
13 Method for Refrigerant Reclamation............................................31
14 Performance of the Unit ................................................................32

14.1 Heating Capacity.......................................................................................................32
14.2 Operating Performance.............................................................................................33
15 Notes on Winter Use......................................................................34
16 Servicing and Maintenance...........................................................35
16.1 Water Replenishment for the Water Tank..................................................................35
16.2 Regular Cleaning for the Water Tank ........................................................................35
16.3 Mg-Stick Replacement..............................................................................................36
16.4 Safety Check Valve Maintenance..............................................................................37
16.5 Maintenance of the Unit ............................................................................................37
17 Precautions for Safety Use........................................................... 38
18 Troubleshooting............................................................................. 39

Air Source Heat Pump Water Heater
1
1 Precautions for Use
indicates the prohibited operations. indicates instructions that must be
followed. indicates instructions to which special attentions must be paid.
Before you use this product, please read the following instructions carefully:
Caution
For any exceptions such as
burning smells, please cut off
the power supply and then
contact GREE authorized
maintenance center.
If an exception persists, the air
source water heater may be
damaged, which may even
cause an electric shock hazard
or cause a fire.
Do not operate the water
heater with wet hand.
Otherwise, an electric shock
hazard may be caused.
Before installation,
check whether the voltage of
the local power grid
accords with the voltage on
nameplate of the unit, and
capacity of the power supply,
power cord or socket is
suitable for input power of
this unit.
Dedicated lines must be
used for the power supply to
prevent a fire.
Do not use multipurpose
sockets or mobile wiring
boards to connect wires.
Otherwise, overheating or
even a fire may be caused.
Pull out the power plug and
drain the main unit and water
tank when water heater is not in
use for a long time to prevent
cracking caused by
cold weather.
Do not damage wires or
use undesignated wires.
Otherwise, overheating or a
fire may be caused.
Before cleaning, please cut
off the power supply.
Otherwise, an electric shock
hazard may be caused.
Use dedicated circuits with a
leakage circuit breaker
protection for the power supply
and ensure sufficient capacity.
Otherwise, overheating, a fire,
or an electric shock hazard
may be caused.
Do not change the power
cord or socket without any
consent. Wiring tasks must
be completed by qualified
electricians. Ensure proper
grounding for the metal part
of the unit, and do not
change the grounding mode.

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The unit must be securely
grounded! The grounding wire
must be connected to a
dedicated apparatus of the
building.
I f the unit is not grounded,
contact qualified personnel for
installation. Do not connect the
ground cable to the gas
pipe, water pipe, drainage
pipe, or any other places
considered improper by
professional personnel.
Do not put any foreign
matter into the unit. Otherwise,
the unit may be damaged or
cause hazards. Do not put
your hands into the air outlet of
the main unit. Otherwise,
hazards may be caused.
Do not repair the unit by
yourself.
Improper repair may cause
an electric shock hazard or a
fire. For repair services,
contact the GREE appointed
service center.
Do not stand on the main
unit or water tank, or place any
object on it.
Otherwise, the main unit
or water tank may be deformed
or damaged, or even hazards
may be posed when a person
or object falls off.
To save energy more
efficiently, install the main unit
at a well-ventilated place. Do
not block the air inlet or outlet
of the main unit.
Otherwise, energy efficiency
may be reduced, and
shutdown or even a fire may
be caused.
Keep chemical sprays,
gas tanks at least 1 meter
away from the main unit.
Otherwise, fire hazards or
explosions may be caused.
Check whether the base of
the main unit is damaged.
If the base is damaged and not
fixed, the unit may fall off,
causing hazards.
To improve durability of
the water tank, a Mg-Stick is
installed inside the water tank.
The Mg-Stick has a lifespan of
two to three years, and must
be replaced by professional
maintenance personnel if a
replacement is required.
When the water tank has
no water or not full filled, do
not power on the unit.
Otherwise, the unit may be
damaged or a fire may be
caused.

Air Source Heat Pump Water Heater
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Open the safety check valve
handle on a regular (about one
month) basis to check whether
it is blocked. Perform sewage
disposal by following the guide
on a regular (about once a
year) basis.
It is normal that the safety
check valve drips.
The pressure relief
opening of the safety check
valve must be connected to
one end of a securely fixed
guide hose, and the other
end is connected to the floor
drain. Ensure that the guide
hose is not twisted or folded.
The installation direction of
the safety check valve must be
correct; that is, the direction
indicated by the arrow on the
safety check valve must be the
same as the flow direction of
cold water.
You are advised to install
the filter horizontally after the
main shutoff valve of the
user's water pipe. Ensure that
the direction indicated by the
arrow on the filter must be the
same as the water flow. If
impurities inside the waterway
need to be cleared, open the
end cap of the filter.
When the filter is installed
vertically, the direction
indicated by the arrow must
not be upward and the end
cap must be placed
slantwise downwards.
This marking indicates that
this product should not be
disposed with other
household wastes throughout
the EU. To prevent possible
harm to the environment or
human health from
uncontrolled waste disposal,
recycle it possibly to promote
the sustainable reuse of
material resources. To return
you used device, please use
the return and collection
systems or contact the
retailer where the product was
purchased. They can take this
product for environmental safe
recycling.
This unit contains
fluorinated gas with
greenhouse effect covered by
the Kyoto Protocol.
Maintenance and disposal
must be carried out by
qualified persons only.
Refrigerant gas R410A,
GWP=2100.
The fuse model and rated
value are in accordance with
the corresponding controller
or the silk screen attached
on the protective tube.

Air Source Heat Pump Water Heater
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2 Models and Technical Specifications
The air source water heater consists of an outdoor unit, a water tank, wired
controller, refrigerant pipes, and water pipes. It provides hot water to users for
household use.
The appearance of the main parts is shown in Figure 2-1. Actually, the
appearance of the product may not be exactly the same as that shown in the figure.
For the actual appearance, refer to the product delivered.
Outdoor unit Wired controller
Water tank
Figure 2-1 Appearance of the main parts
This installation guide provides guidance on installation of the following model.
Table 2-1 Mapping between the main unit and the water tank
Outdoor unit model
Water tank model
CH-HP3.5SWNK
WT200SW1.5ENK

Air Source Heat Pump Water Heater
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During the installation, please comply with the model mapping in the preceding
table. Otherwise, a fault may occur because the main unit mismatches the
exchanger capacity of the water tank.
Table 2-2 Unit Model and Specification
Model
CH-HP3.5SWNK
Rated Heating Capacity(*)
W
3500(1800～4000)
Rated Input Power(*)
W
850(360～1333)
COP(*)
W/W
4.10
Load Profile
-
L
COPDHW(**)
W/W
3.17
Energy Efficiency Class(2)
-
A
Water Heating Energy Efficiency(2)
-
129%
Annual electricity consumption
(average climate conditions)
kW h
795
Maximum Input Power
W
1500+1500W (Electric Heater)
Outlet Water Temperature
° C
Default: 55° C , 35° C ~55° C
Power Supply
-
220V-240V ~50Hz
Insulation Level
-
Ⅰ
Protection of Ingression
-
ⅠPX4
Refrigerant
Name
R410A
Charge
kg
1.40
Outline Dimensions
W x D x H
mm
842×320×591
Package Dimensions
W x D x H
mm
941×371×660
Gross/Net Weight
kg
44.5/38.5
Sound Power Level(***)
dB(A)
63
Operating Range
° C
-25~45° C
Notes:
①(*) Value obtained with the following conditions: Outdoor temperature:
20° C DB/15° C WB; Water tank temperature (start/end): 15° C /55° C .
②(**) Value obtained with an air temperature of 7° C and a water inlet at 10℃,
as per EN16147, (EU) No 814/2013.

Air Source Heat Pump Water Heater
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③(***) Value obtained as per EN 12102-2008.
④Under Rapid function, electric heater helps to heating water.
Please always see the nameplate for the exact data as this table is subject to
change.
Table 2-3 Water Tank Model and Specification
Model
WT200SW1.5ENK
Capacity
L
185
Power Supply for Electric Heater
-
220V-240V~50Hz
Input Power for Electric Heater
W
1500
Outline Dimensions(W x D x H)
mm
545 x 545 x 1919
Package Dimensions(W x D x H)
mm
2009 x 656 x 625
Water Tank Gross/Net Weight
kg
60/52
Outer Size of Connection Pipe
mm
Φ6, Φ9.52
Notes: Please always see the nameplate for the exact data as this table is subject to
change.
Table 2-3 Performance Data of Hot water Mode
T e （℃）
Mode
inlet water T1
（℃）
outlet water T2
（℃）
capability
(kW)
COP
(W/W)
45
Hot water
29
55
2.90
7.80
20
15
55
3.50
4.10
7
10
55
1.80
3.80
0
10
55
1.90
2.30
-7
10
55
2.40
2.20
-15
10
55
1.90
1.80
-20
10
55
1.40
1.50

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3 Working Principles and Advantages
3.1 Schematic Diagram of the Air Source Water
Heater
Figure 3-1 Schematic diagram of the air source water heater
3.2 Brief Introduction to Principles
The air source water heater unit is designed based on the heat pump principles.
It consumes a part of electric energy as a supplement, and by using the
thermodynamic cycle, absorbs heat from the low-grade energy (air source)
environment, and transfers the heat to a condenser through a compressor, and
releases it to the water inside the water tank. In this way, the water is heated up.
The working principles of an air source water heater are the same as those of a
heat pump air conditioner.Aheat pump air conditioner absorbs heat from the natural
environment and transfers it to the indoor air; however, the air source water heater
uses the absorbed heat to heat up domestic water. The air source water heater is a
novel, efficient, energy-saving, and environment-friendly heater product.

Air Source Heat Pump Water Heater
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3.3 Advantages
Efficient and Energy-Saving
The outdoor unit of this product adopts an electronic expansion valve for
adaptive control. It automatically adjusts its opening size based on the unit operating
conditions, and uses the heat in the air to heat up domestic water, so that the unit
always runs at optimal performance as well as ensuring reliability.
This unit adopts inverter 2-stage compressor and the capacity can realize
stepless adjustment. EER is much higher and noise is lower under low-frequency
operation; rapid heating can be realized under high-frequency operation. Heating
capacity is improved by 40% above compared with common heat pump water
heater.
The water tank adopts an externally wrapped microchannel heat exchanger,
and is in planar contact with the inner container, which features higher efficiency in
heat exchange and a high pressure-bearing capability. Effective
thermally-conductive materials are used between the microchannel heat exchanger
and the inner container of the water tank to enhance heat transfer.
In testing conditions of the unit, the coefficient of performance (COP) reaches
up to 3.0, and the operating costs are more economical than conventional heaters.
Reliability and Durability
The unit adopts heap pump water heater specialized inverter 2-stage
compressor, which provides a powerful heat for the air source water heater. The unit
can produce 55℃hot water reliably under -25℃ultra-low ambient temperature.
The insulated water tank adopts the advanced stainless steel inner port,
equipping with the anticorrosive design for the super-long magnesium. The complete
unit is with multiple kinds of protection.
Simple and Convenient Installation
The installation is not subject to any environmental limitation. The unit can be
installed in the kitchen, balcony, garage, storage room, or basement according to
actual living conditions, and requires no special care. It applies to places such as
household use and villa suites. It is a no-loop waterway system, and can be easily
and conveniently installed.
Luxury Configurations:
The unit is equipped with a high-end ultra-thin touch-wired controller, which
provides five heating modes: Hot water, Save, Preset, Night and E-heater modes.

Air Source Heat Pump Water Heater
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The unit provides a proper water temperature range from 35°C to 55°C. It provides
functions such as timer switch, "Rapid" and "i-know".
Intelligent Defrosting
The unit provides the antifreeze and automatic defrosting functions, which
effectively solve the problems such as heat exchanger freezing, frosting, and
sewage caused by defrosting.
All-Weather Applicable
Supplies hot water all year round regardless of nights or rainy weather.

Air Source Heat Pump Water Heater
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4 Installation Precautions
4.1 Importance Notes
(1) The air source water heater must be installed by professional personnel
by abiding by the national wiring code and following the instructions in this guide.
(2) For installation or migration of the air source water heater, please contact
your local service centers authorized by C&H. In the case of an air source water
heater installed by any party not authorized or designated by C&H, C&H shall not
undertake any responsibility for any fault or problems caused the air source water
heater.
(3) If the user installs the air source water heater using self-prepared
installation materials, C&H shall not undertake any responsibility for any loss
caused by improper running and use of the air source water heater due to pipe
leakage, fall-off, or insecure installation.
(4) The quality of water heated by the air source water heater meets the local
drinking water health standards. If well water, groundwater, and seawater are used,
the depletion of the Mg-Stick in the water tank may be accelerated, thereby
shortening the lifespan of the unit.
(5) The water processed by the ion exchange water softener accelerates the
depletion of the Mg-Stick in the water tank. Therefore, you are advised not to
connect the water inlet of the air source water heater to a water softener.
4.2 Basic Requirements for Installation Sites
The following sites for installing the air source water heater may be prune to
become faulty. If the following sites cannot be avoided, please consult your local
service centers authorized by C&H to customize special models.
(1) Environments that are exposed to strong heat sources, steam, flammable
gases, or volatile substances.
(2) Places where there are high-frequency facilities, such as welding
machines or medical equipment.
(3) Seaside saline areas.
(4) Places where the air contains oil (such as machine oil).
(5) Places where the air contains sulfide gases (such as sulfide hot springs).
(6) Other special environments.

Air Source Heat Pump Water Heater
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5 Main Unit Installation
5.1 Location for Installing the Main Unit
The main unit must be installed at a location where:
(1) The noise and air flow generated by the air outlet do not affect neighbors,
animals, and plants.
(2) Good ventilation of the main unit can be ensured, and there are no
obstructions nearby that hinders the air intake or output of the unit
(3) The installation position is able to withstand the weight and vibration of the
main unit, and the installation can be safely performed.
(4) The place is dry and not exposed to direct sunlight or strong winds.
(5) The installation dimension diagram of the main unit can be complied with,
and it is convenient to maintain and check the unit.
(6) The main unit is out of the reach of children.
(7) It does not hinder public aisle or affect city appearance.
5.2 Space Requirement for Main Unit Installation and
Installation Diagram
(1) The installation requirements of the water heater's main unit are the same
as those of the outdoor unit of an air conditioner. The main unit can be installed in
the exterior walls, roof, balcony, or ground. The air outlet should avoid the wind
direction. The dimension diagram of the main unit structure is shown in Figure 5-1
(unit: mm).
(2) The distance between the main unit and the walls or other obstructions
must not be too small, and the space for installing the main units must meet the
requirements provided in Figure 5-2.
(3) If a canopy is to be installed for the water heater main unit, note that the
heat dissipation and absorption should not be affected.
(4) The main unit must be installed in the host places a solid foundation, and
ensure that the main unit is installed upright, and fastened with foundation bolts. If
the vibration is strong, add rubber gaskets to prevent vibration.
(5) Condensate drain of the outdoor unit: buckle snap the drainage joint of

Air Source Heat Pump Water Heater
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the outdoor unit into the drainage hole located in the middle of the chassis, as shown
in Figure 5-3, and ensure reliable and tight fitting. Then, connect the drainage pipe to
the drainage mouth, and guide the drainage pipe to a proper place for drain.
Unit：mm
Model
A
B
C
D
E
F
CH-HP3.5SWNK
260
320
842
784
591
540
Figure 5-1 Dimension diagram of the main unit structure
Distance from obstructions
≥50 cm
Distance
from the wall
Air outlet side
Air inlet side
Distance
from the wall ≥50 cm
≥30 cm
≥30 cm
≥200 cm
Outdoor unit chassis
Outdoor unit drainage joint
Figure 5-2 Space requirements for installation Figure 5-3 Drainage pipe connection

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6 Installation of the Water Tank
(1) The water tank can be installed outdoors with the main unit, for example,
installed in the balcony, roof, or ground. It can also be installed inside the room. Try
to install it in an environment where the temperature is higher than 0°C. The
hot water outlet should not be too far away from the locations for use. Lay out the
pipes in a centralized manner, and take thermal insulation measures on hot water
piping to reduce heat loss.
(2) The water tank must be placed upright with all feet touching the ground. It
must be installed on a solid foundation. During water tank installation, consider
the weight bearing capability of the foundation. Figure 6-1 shows the installation
diagram.
Keep the feet of the
unit down to earth
Distance from
obstructions
≥20cm
≥50cm
Distance
from
the wall
Figure 6-1 Fastening of the water tank
Note: The water tank must also be fastened to the wall using a tank mounting
hoop or plate to prevent fall-off the water tank due to exceptions.
(3) There should be water pipes, hot water interfaces, and floor drains to
facilitate water replenishment for the water tank, hot water supply, and drainage. And
the pressure of the tap water shouldn’t higher than 0.7MPa, else, a decompressor
should be installed in the water inlet pipe.

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7 Pipeline Connection
7.1 Refrigerant Pipe Connection
(1) If the water tank and the main unit need to be connected by punching
through a wall, a hole of Φ 55 mm must be drilled in the wall and the hole should be
inclined toward the exterior wall, as shown in Figure 7-1. Protective sleeves need to
be put on both sides of the hole.
(2) Bind up the connecting pipes, power cable, water temperature sensing
package, and communication lines (if necessary) of the wired controller with thermal
insulation bands, and then lead them through the hole.
(3) Remove the refrigerant pipe joint from the water tank and the sealing nuts
from the small and large valves of the outdoor unit, and add refrigerant oil on the
joint and valve cones.
(4) Remove the sealing caps of the connecting pipe. Align the center of the
bell mouth with the pipe joint and valve cone, and screw up the conical nut with your
hand and then with a wrench, as shown in Figure 7-2.
Indoor
Wall Protective sleeve
through the wall
Outdoor
Figure 7-1 Refrigerant connecting pipe through the wall
Conical
nut Designated
pipes
Torque
wrench
Figure 7-2 Fastening the connecting pipe

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Caution: Perform pipe layout and bending carefully. Do not damage
connecting pipes. Do not screw up the nut too tight to damage to the nut, its corners,
or the bell mouth, or too loose to cause leakage. Table 7-1 shows the tightening
torque.
Table 7-1 Recommended tightening torque
Hex nut
Φ 6
Φ 9.52
Tightening torque (N•m)
15-20
31-35
7.2 Exhaust Methods
Table 7-2 Exhaust methods
Length of Connection Pipe
Air Exhaust Method
Refrigerant Charge
Volume
Not greater than 10 m
Use a refrigerant in the
outdoor unit
/
10 to 20 m
Use a vacuum pump
+22g/m
Note: The unit capability and energy efficiency decreases when length of the
connecting pipe increases. Therefore, take thermal insulation measures on the
connecting pipe when it needs to be extended.
(1) Use a refrigerant in the outdoor unit:
1) Remove the valve cap and the fluoride injection mouth nut from the fluid
valve and the air valve.
2) Use a hex key to slightly unscrew the valve plug of the fluid valve, and use
a screwdriver to jack up the valve core of the air valve. Then, the air is
discharging.
3) Discharge the air for about 15 seconds. When there is refrigerant gas
discharged, close the valve core and tighten the fluoride injection mouth
nut.
4) Fully open the valve cores of the fluid valve, and the air valve, as shown in
Figure 7-3.
5) Tighten the valve cap, and then use a leak detector or soapy water to
check whether the pipes for connecting the outdoor unit and the water tank
leak.

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Fluoride
injection mouth
Screwdriver
Fluid pipe
Fluid valve
Hex key
Air pipe
Air valve
Figure 7-3 Opening the fluid valve and air valve
Pressure gauge
-76cmHg
Low pressure
valve opened
High
pressure
valve
closed
Hoses filled
Fluid valve
Air valve Vacuum
pump
Figure 7-4 Vacuum pump connection diagram
(2) Vacuum pump:
1) Connect the filling hose to the fluoride injection mouth of the air valve.
Ensure that the valve cores of the air valve and fluid valve are tightly
closed.
2) Connect the joint of the filling hose to the vacuum pump, as shown in
Figure 7-4.
3) Fully open the low pressure valve of the pressure gauge.
4) Start the vacuum pump to vacuumize the air for 20 minutes or more, and
ensure that the pressure gauge pointer points to -1.0 x 105 Pa (-76cmHg).
Close the low pressure valve, and stop running the vacuum pump. Wait 2
minutes. If the number indicated by the pressure gauge pointer does not
rise, the vacuumization and piping are successful. If the number indicated
by the pressure gauge pointer rises, it indicates that air is entering the
system. In this case, check the piping for leaks, and vaccumize the air