A.O. Smith CAHP-120C Series User manual

R

1
TABLEOFCONTENTS PAGE
1 Important Safety Information ............................................................................... 2
2 Physical and Technical Specifications................................................................. 4
3 Installation Instructions....................................................................................... 10
4 Electrical Connection Instructions..................................................................... 14
5 Operation Instructions......................................................................................... 22
6 Maintenance Instructions.................................................................................... 35
7 Trouble Shooting Instructions ............................................................................ 38
8 Appendix............................................................................................................... 41

2
1 Important Safety Information
Please read all of the instructions thoroughly before the installation and operation of the water
heater. Please keep this manual for future reference.
zUnder no circumstance will A.O.SMITH Company be held liable for any damage that
caused by failure to comply with the installation and operation instructions outlined in this
manual. Only qualified persons authorized by the manufacturer can perform the
installation, the service and the maintenance of the water heater.
zKeep necessary space for water heater installation. Failure to comply with the
requirements of installation can affect the performance of the water heater.
zPlease perform inspection and necessary maintenance regularly after the installation and
operation of the water heater. If you find the water heater operateing abnormally, stop the
operation of the unit immediately, and call service phone to service the unit at once to
ensure the normal, safe and reliable operation of the water heater.
zDo not insert fingers or other stuff into the fan guard to avoid hurt or damage. Do not
touch the fan motor surface to avoid high temperature hurt.
zPlease inspect and replace the anode regularly because it is a consumable part. It is
recommended that the replacement change interval be 2 to 3 years. You can call service
phone to reserve buying and replacing a new anode, which will extend the life of the
water heater.
zThe water heater has the risk of causing severe scalds. Please mix hot water with cold
water before bathing or showering.
zIf the water heater is subjected to dry fire, it will produce steam or hot water with high
temperature, which is in risk of causing severe scalds. The water heater should be fully
filled with water. If it is subjected to dry fire, please disconnect the power supply, shut off
the water supply and stop the operation of the unit immediately, and call service phone to
contact a qualified person to inspect and service the unit.
zIf any component of the water heater has been immersed in water, it should be inspected
or serviced by a qualified person before being employed.
zFor the water heater provided with a power cord, the power cord replacement should be
performed by a service department or a person qualified by the manufacturer if it is
damaged. Electrical insulation and thermal insulation have been provided for the
important components of the water heater.
zThe water heater is provided with a temperature and pressure relief valve, whose
installation location should not be changed privately and whose outlet should not be
blocked for the security of utilization. The temperature and pressure relief valve should
be connected to an adequate discharge line, which is continuously downward without
any knot, and the discharge line should be terminated at a floor drain directly.
zThe outlet water (including the hot water with high temperature) of the water heater
should not be provided as potable water.
zThe water heater should be connected to a separate branch circuit. Please check the
electricity meter, the circuit breaker and the wire size to make sure that they comply with
the rated current of the water heater. Call a qualified electrician to check them in case of

3
need.
zThe power supply socket should be mounted in dry places where there is no moisture,
and please do not touch the electrical parts with wet hands. Failure to do so can result in
electric shock, injury and the equivalent.
zDamaged wires or ageing, loosening or unfastened power supply plug should not be
used. Failure to do so can result in electric shock, short circuit or fire. It should be
confirmed that the power supply plug contacts with the receptacle tightly.
zIn order to reduce the operation cost, the hot water outlet tubes should be properly
insulated.
zDisconnect the power supply before performing any maintenance or service. Only
qualified persons authorized by the manufacturer can perform the maintenance and
service.
zThe manufacturer or seller of the water heater will not be liable for any damage caused
by unauthorized installation. These damages include but not limited to leakage of coils,
dropping of the unit, the abnormal operation and poor performance caused by improper
installation, adverse effect and damage of water heater, and all relevant losses.
A.O.SMITH WATER HEATER COMPANY LTD. reserves the rights of final interpretation of the
above terms.
WARNING: The power supply should be grounded reliably before energizing the unit, and it
is forbidden to operate the water heater without reliable grounding! The water heater must
be provided with floor drain with good drainage nearby, and located in an area where
leakage of the water heater or a connection will not result in damage to the area adjacent to
the water heater or to lower floors of the structure.
CAUTION: Failure to comply with the requirements of this manual can result in fire, property
loss, injury or death.

4
2 Physical and Technical Specifications
2.1 CAHP-80 Physical and Technical Specifications
Figure 2.1 Figure 2.2
Table 2.1 Physical Dimensions
Total
Height
A (mm)
Tank
Diameter
B (mm)
Maximum
Depth
C (mm)
Service
Panel Width
D (mm)
Relief Valve
Height
E (mm)
Water Outlet
Height
F (mm)
Water Inlet
Height
G (mm)
Relief Valve
Angle Į(°)
Maximum
Width
H (mm)
1670 610 901 503 1457 1427 135 22 686
Table 2.2 Technical Specifications
Model Number CAHP-80-6 CAHP-80-8 CAHP-80-10 CAHP-80-12
Model Type / Outdoor Integrated Heat Pump Water Heater
HP Rated
Power (1)
380V/3N/60Hz kW 1.25
220V/1N/60Hz kW 1.25
400V/3N/50Hz kW 0.98
230V/1N/50Hz kW 0.98
HP Rated
Heating
Capacity (1)
380V/3N/60Hz kW 4.13
220V/1N/60Hz kW 4.13
400V/3N/50Hz kW 3.5
230V/1N/50Hz kW 3.5
Unit Maximum 380V/3N/60Hz kW 9.7 (5.9) (2) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7)

5
Power 220V/1N/60Hz kW 9.7 (5.9)
(2) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7)
400V/3N/50Hz kW 9.3 (5.5)
(2) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3)
230V/1N/50Hz kW 9.3 (5.5)
(2) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3)
Unit Maximum
Heating
Capacity
380V/3N/60Hz kW 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13)
220V/1N/60Hz kW 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13)
400V/3N/50Hz kW 9.5 (6.5) 11.5 (7.5) 13.5 (8.5) 15.5 (9.5)
230V/1N/50Hz kW 9.5 (6.5) 11.5 (7.5) 13.5 (8.5) 15.5 (9.5)
Maximum
Operation
Current
380V/3N/60Hz A 15.8 21 26.3 31.5
220V/1N/60Hz A 41.6 (25.8) 52 (31) 62.6 (36.3) 73 (41.5)
400V/3N/50Hz kW 15.8 21 26.3 31.5
230V/1N/50Hz A 39.1 (23.3) 49.5 (28.5) 60.1 (33.8) 70.5 (39)
Refrigerant / R134a
Refrigerant
Charge Quantity
50Hz g 1000
60Hz g 1100
Electrical Heating Capacity kW 6 (3) 8 (4) 10 (5) 12 (6)
Tank Capacity L 300
Hot Water
Delivering Rate
/ Efficiency
380V/3N/60Hz L/h 89 89 89 89
220V/1N/60Hz L/h 89 89 89 89
400V/3N/50Hz L/h 75 75 75 75
230V/1N/50Hz L/h 75 75 75 75
Hot Water
Delivering Rate
/ High Demand
380V/3N/60Hz L/h 218 (153.5) 261 (175) 304 (196.5) 347 (218)
220V/1N/60Hz L/h 218 (153.5) 261 (175) 304 (196.5) 347 (218)
400V/3N/50Hz L/h 204 (139.5) 247 (161) 290 (182.5) 333 (204)
230V/1N/50Hz L/h 204 (139.5) 247 (161) 290 (182.5) 333 (204)
Max. Water Temperature
In Efficiency Mode ć65
Operation Temperature Range ć3582
Ambient Temperature for HP ć548
Ambient Temperature for Unit ć-1550
Unit Operation Noise(3) dB(A) 52 (50Hz) / 57 (60Hz)
Air Outlet Noise(3) dB(A) 58 (50Hz) / 60 (60Hz)
Dimensions (LhWhH) mm 901h686h1670
Net Weight kg 165
Operation Weight kg 465
Anode / Aluminum Rod, Magnesium Rod
Control Mode / LCD Wire Display (Standard 10m, Optional Maximum 30 m)
Operation Mode / Efficiency, High Demand
Other Control Functions / Timer, Anti freezing, Fault Alarming, Water Pump Controlling
Power Supply Specification / 220V/1N/60Hz&380V/3N/60Hz&230V/1N/50Hz&400V/3N/50Hz
Connection
Size
Water Inlet / NPT 3/4 (Female Thread)
Water Outlet / NPT 3/4 (Female Thread)
T&P Relief Valve / NPT 3/4 (Female Thread)
Drain Valve / NPT 3/4 (Female Thread)

6
(1) Heat pump performance is the mean performance under condition “20 (dry bulb) / 15 (wet
bulb) ćambient temperature and 15ćto 55ćwater temperature”.
(2) The parameters in parentheses are for one heating element operation mode.
(3) Sound Pressure Level@1m.
2.2 CAHP-120 Physical and Technical Specifications
Figure2.3 Figure2.4
Table 2.3 Physical Dimensions
Total
Height
A (mm)
Tank
Diameter
B (mm)
Maximum
Depth
C (mm)
Service
Panel
Width
D (mm)
Relief Valve
and Water
Outlet Height
E (mm)
Drain Valve
and Water
Inlet Height
G (mm)
Relief Valve
Angle Į(°)
Maximum
Width
H (mm)
1700 711 1002 503 1467 144 22 770
Table 2.4 Technical Specifications
Model Number CAHP-120-6 CAHP-120-8 CAHP-120-10 CAHP-120-12
Model Type / Outdoor Integrated Heat Pump Water Heater
HP Rated
Power (1)
380V/3N/60Hz kW 1.25
220V/1N/60Hz kW 1.25
400V/3N/50Hz kW 0.98
230V/1N/50Hz kW 0.98
HP Rated 380V/3N/60Hz kW 4.13

7
Heating
Capacity (1)
220V/1N/60Hz kW 4.13
400V/3N/50Hz kW 3.5
230V/1N/50Hz kW 3.5
Unit Maximum
Power
380V/3N/60Hz kW 9.7 (5.9)
(2) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7)
220V/1N/60Hz kW 9.7 (5.9)
(2) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7)
400V/3N/50Hz kW 9.3 (5.5)
(2) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3)
230V/1N/50Hz kW 9.3 (5.5)
(2) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3)
Unit Maximum
Heating
Capacity
380V/3N/60Hz kW 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13)
220V/1N/60Hz kW 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13)
400V/3N/50Hz kW 9.5 (6.5) 11.5 (7.5) 13.5 (8.5) 15.5 (9.5)
230V/1N/50Hz kW 9.5 (6.5) 11.5 (7.5) 13.5 (8.5) 15.5 (9.5)
Maximum
Operation
Current
380V/3N/60Hz A 15.8 21 26.3 31.5
220V/1N/60Hz A 41.6 (25.8) 52 (31) 62.6 (36.3) 73 (41.5)
400V/3N/50Hz kW 15.8 21 26.3 31.5
230V/1N/50Hz A 39.1 (23.3) 49.5 (28.5) 60.1 (33.8) 70.5 (39)
Refrigerant / R134a
Refrigerant
Charge
Quantity
50Hz g 1000
60Hz g 1100
Electrical Heating Capacity kW 6 (3) 8 (4) 10 (5) 12 (6)
Tank Capacity L 455
Hot Water
Delivering Rate
/ Efficiency
380V/3N/60Hz L/h 89 89 89 89
220V/1N/60Hz L/h 89 89 89 89
400V/3N/50Hz L/h 75 75 75 75
230V/1N/50Hz L/h 75 75 75 75
Hot Water
Delivering Rate
/ High Demand
380V/3N/60Hz L/h 218 (153.5) 261 (175) 304 (196.5) 347 (218)
220V/1N/60Hz L/h 218 (153.5) 261 (175) 304 (196.5) 347 (218)
400V/3N/50Hz L/h 204 (139.5) 247 (161) 290 (182.5) 333 (204)
230V/1N/50Hz L/h 204 (139.5) 247 (161) 290 (182.5) 333 (204)
Max. Water Temperature
In Efficiency Mode ć65
Operation Temperature Range ć3582
Ambient Temperature for HP ć548
Ambient Temperature for Unit ć-1550
Unit Operation Noise(3) dB(A) 52 (50Hz) / 57 (60Hz)
Air Outlet Noise(3) dB(A) 58 (50Hz) / 60 (60Hz)
Dimensions (LhWhH) mm 1002h770h1700
Net Weight kg 198
Operation Weight kg 653
Anode / Aluminum Rod, Magnesium Rod
Control Mode / LCD Wire Display (Standard 10m, Optional Maximum 30 m)
Operation Mode / Efficiency, High Demand
Other Control Functions / Timer, Anti freezing, Fault Alarming, Water Pump Controlling

8
Power Supply Specification / 220V/1N/60Hz&380V/3N/60Hz&230V/1N/50Hz&400V/3N/50Hz
Connection
Size
Water Inlet / NPT 3/4 (Female Thread)
Water Outlet / NPT 3/4 (Female Thread)
T&P Relief Valve / NPT 3/4 (Female Thread)
Drain Valve / NPT 3/4 (Female Thread)
(1) Heat pump performance is the mean performance under condition “20 (dry bulb) / 15 (wet
bulb)ćambient temperature and 15ćto 55ćwater temperature”.
(2) The parameters in parentheses are for one heating element operation mode.
(3) Sound Pressure Level@1m.
2.3 CAHP-120C Physical and Technical Specifications
Figure2.5 Figure2.6
Table 2.5 Physical Dimensions
Total
Height
A (mm)
Tank
Diameter
B (mm)
Maximum
Depth
C (mm)
Service
Panel Width
D (mm)
Relief Valve
Height
E (mm)
Water Outlet
Height
F (mm)
Water Inlet
Height
G (mm)
Relief Valve
Angle Į(°)
Maximum
Width
H (mm)
1770 711 1002 600 1476 1468 153 22 770
Table 2.6 Technical Specifications
Model Number CAHP120C06 CAHP120C08 CAHP120C10 CAHP120C12
Model Type / Outdoor Integrated Heat Pump Water Heater
HP Rated Power (1) kW 2.25
HP Rated Heating Capacity (1) kW 8.5
Unit Maximum Power kW 11.1 (7.3) (2) 13.7 (8.6) 16.2 (9.9) 18.8 (11.1)

9
Unit Maximum Heating Capacity kW 14.5 (11.5) (2) 16.5 (12.5) 18.5 (13.5) 20.5 (14.5)
Maximum
Operation
Current
400V/3N/50Hz A 15.8 21 26.3 31.5
230V/1N/50Hz A 47.1 (31.3) 57.5 (36.5) 68.1 (41.8) 78.5 (47)
Refrigerant / R134a
Refrigerant Charge Quantity g 2100
Electrical Heating Capacity kW 6 (3) 8 (4) 10 (5) 12 (6)
Tank Capacity L 430
Hot Water
Delivering Rate
Efficiency L/h 182 182 182 182
High Demand L/h 310 (246) 353 (267) 396 (289) 439 (310)
Max. Water Temperature
In Efficiency Mode ć65
Operation Temperature Range ć3582
Ambient Temperature for HP ć048
Ambient Temperature for Unit ć-1550
Unit Operation Noise(3) dB(A) 59
Air Outlet Noise(3) dB(A) 62
Dimensions (L×W×H) mm 1002×770×1770
Net Weight kg 264
Operation Weight kg 694
Anode / Aluminum Rod
Control Mode / LCD Wire Display (Standard 10m, Optional Maximum 30 m)
Operation Mode / Efficiency, High Demand
Other Control Functions / Timer, Anti freezing, Fault Alarming, Water Pump Controlling
Power Supply Specification / 230V/1N/50Hz & 400V/3N/50Hz
Connection
Size
Water Inlet / NPT 3/4 (Female Thread)
Water Outlet / NPT 3/4 (Female Thread)
T&P Relief Valve / NPT 3/4 (Female Thread)
Drain Valve / NPT 3/4 (Female Thread)
(1) Heat pump performance is the mean performance under condition “20 (dry bulb) / 15 (wet
bulb)§ambient temperature and 15§to 55§water temperature”.
(2) The parameters in parentheses are for one heating element operation mode.
(3) Sound Pressure Level@1m.

10
3 Installation Instructions
3.1 Location Requirements
zThe water heater should be located in the place which is near power supply, water supply
system and drainage line.
zThe water heater should be located in the place which is free from the following: oil
smoke, severe electromagnetic waves, big voltage fluctuation, acid steam or alkaline
steam.
zThe water heater should be located on the floor, which must be able to withstand the total
weight of the water heater filled with water.
zWhen the water heater is located in a basement, indoor or in any other limited space, the
airflow surrounding of the unit must be unrestricted.
zThe water heater should be located on a flameproof floor that has the height no less than
100 mm and there should be a floor drain around, which should have adequate drainage
capability and could suffer temperature (100ć), so that the leakage of the water heater
or the water tubes will not result in damage to any other equipment.
zThe base support of the water heater should be fixed to prevent the unit from dumping
with outsource force.
zPlease determine the installation location with principle that the unit operation sound
would have no influence on you and your neighbors.
CAUTION: Put the water heater aside for at least 30 minutes after the unit is located, and
then connect it to the power supply.
CAUTION: *The water heater is heavy, please use a forklift or have three or more people
are necessary to move and install the water heater. Failure to do so can result in injury.
*Please transport the water heater as it leaves the factory; do not move the water heater
with inclined angle more than 30Û.Keep the water heater stored in a standing position. Do
not remove the package or install the water heater privately.
WARNING: If the water heater is installed in the places where it would be easily subjected
to lightning strike, such as on the roof top of buildings, lightning-protection is necessary.
CAUTION: Do not power off the water heater when the ambient temperature is lower than
5ć. If it has to be, please drain out water completely in advance; otherwise the
manufacturer will not be liable for any of the damages of the unit or the property loss
caused by that. If the water heater is connected to circulation system, the circulation line
should be well insulated and provided with applicable temperature control so that the line
will not be frozen; otherwise the manufacturer will not be liable for any of the damages of
the line and the unit or property loss caused by that.

11
zIt is necessary to increase the installation height in locations which might have snow to
avoid damage to the unit. Make sure the floor height to be higher than average snow
thickness of the location.
zDo not install the heater under the eave except some solution is taken to avoid the rain
dropping on the unit.
zOpen the top cover and the center spud on the top of the tank could be used to lift the
unit.
3.2 Space Requirements for Installation and Maintenance
Keep the space specified in figure 3.1 and figure 3.2 before water heater installation.
Keep the distance specified between the obstacle and the air outlet no less than 800
mm.
Leave 1200 mm free space on the top of the unit for the anode maintenance.
Figure 3.1 Figure 3.2















CAUTION: In order to reduce the operation cost, the hot water outlet pipes should be
properly insulated. If the water heater is subjected to freezing temperature that is less than
0ć, the cold water inlet pipes should also be insulated.
CAUTION: In order to reduce the operation cost, please select PP-R tube with good
insulation performance. According to water temperature, working pressure, tube life and
the equivalent, the wall thickness of PP-R pipes is rated for the following six series by
pressure, PN1.0, PN1.25, PN1.6, PN2.0, PN2.5 and PN3.2. For hot water pipe and
fittings, the minimum pressure rating is PN2.0; for cold water pipe and fittings, the
minimum pressure rating is PN1.0.
CAUTION: There is a tube at the hot outlet connection of the water heater. Please do not
remove or damage it during installation process.As the threaded joints are screwed in, the
tube would be installed into right depth.
Flameproof Floor
The height should be no less than 100mm

12
3.3 Water Supply Connections
Refer to figure 3.3 for typical installation. The installation of flexible couplings is
recommended on the hot and cold water connections so that the water heater may be easily
disconnected for servicing if necessary. The HOT and COLD water connections are 3/4” NPT
on all models.





It is also recommended to install an expansion tank in the cold water line between the
water heater and the check valve to avoid the possible damage caused by thermal
expansion.
Install a stop valve in both the cold and hot water lines as the location indicated in figure
3.3. This will enable easier service or maintenance of the unit later.
Install a pressure regulation valve in the cold water line to control the water pressure if
the water supply pressure exceeds the maximum water pressure listed on the nameplate.
Install a mixing valve to mix the hot water delivered by the water heater to avoid possible
hurt caused by high water temperature.
It’s recommended to insulate the hot water to reduce the heat loss.
3.4 Piping Connection Diagram Figure 3.3


3.5 Temperature and Pressure Relief Valve
Install a relief tube with connection size of NPT 3/4 (Male Thread) at the relief port of the
temperature and pressure relief valve, and the relief tube should be terminated at a floor drain.
The relief tube should be downward and installed in a frost-free space. Do not install any shut
off devices in the relief tube.
The temperature and pressure relief valve should be inspected every month to ensure it
CAUTION: Please install a check valve with pressure relief function in the cold water line
to avoid possible damage to the heater or other related parts caused by water pressure
variation. Please call our service call to get details on the valve in case of need.

13
is in effective operation. Please pull the handle of the relief valve several times to ensure the
valve can switch freely. Please pull the handle of the relief valve once every month, and
discharge 4~8L water, which can prevent scaling inside of the relief valve.
Figure 3.4
3.6 Circulating Pump Selection



It is recommended to select the circulating pump based on the information listed in table
3.1. If the flow rate of the water circulating pump is much larger than the listed flow rate, the
energy consumption would increase.
Table 3.1 Parameters for Circulating Pump Selection

The recommended water circulating pump is the high water temperature water pump,
Grundfos Pumper UP15-14BT, which has nominal water flow rate 0.3 cubic meters and lift 1m.
If other pump is used, adjust the pump according to actual condition for proper water supply.
Piping Length (m) Power (W) Water Flow Rate (m3/h) Piping Pressure Drop (kPa)
2550 25 0.2 — 0.3 11
WARNING: The relief tube must not be blocked in any case. The relief tube exit should be
communicated with atmosphere. Please make sure the hot water released should not
result in any injury or property loss.
CAUTION: Please select the circulating pump which is special for hot water application.
The maximum temperature rating needs to be higher than 90 .ć
WARNING: Insulate around the T&P relief valve and the relief tube to prevent freezing in
winter which can result in safety accident.
T&P Relief Valve
Handle
Relief Tube

14
4 Electrical Connection Instructions
4.1Important Information
Only special power supply applies to the water heater, and the maximum fluctuated
voltage value should be within the range of 90% to 110% of nominal voltage.
The conductor arrangement should be performed by a qualified electrician and comply
with the requirement of electrical safety.
The water heater and power supply should be properly grounded. Otherwise it can result
in fire or electric shock.
Keep the power cord and the signal wires tidy and rational. Separate the wires of
hazardous voltage electrical circuits from the wires of extra-low-voltage circuits, and they
should not disturb each other. Keep all the cables and wires free from the piping and valves.
The power cord outside the unit should be isolated properly to prevent people contacting
them, or ensure the touch would not result in electric shock (touchable double insulation
cable could be used or add insulation to normal power cord).
4.2Power Cord Connection
1. Select power cord for CAHP80/120 units according to the unit model and the power supply
with reference to table 4.1. Select power cord for CAHP120C units according to table 4.2.
Table 4.1 Power Supply Specification for CAHP80/120
Unit
Model
Power
Supply
Cable Size (mm2)
(Plastic Insulation and Conduit)
Air Breaker
Capacity (A) Current
Leakage
Protection
Two Elements
Working Mode
One Element
Working Mode Two
Elements
One
Element
Phase
Wire
Neutral
Wire
Ground
Wire
Phase
Wire
Neutral
Wire
Ground
Wire
CAHP-80-6
CAHP-120-6
380V
3N~60Hz 2.5 2.5 2.5 2.5 2.5 2.5 25 25
30mA
Less than
0.1s
220V~
1N~60Hz 10 10 10 6 6 6 50 30
400V
3N~50Hz 2.5 2.5 2.5 2.5 2.5 2.5 25 25
230V~
1N~50Hz 10 10 10 6 6 6 50 30
CAHP-80-8
CAHP-120-8
380V
3N~60Hz 4 2.5 4 4 2.5 4 30 30
220V~
1N~60Hz 10 10 10 10 10 10 60 40
400V
3N~50Hz 4 2.5 4 4 2.5 4 30 30
230V~
1N~50Hz 10 10 10 10 10 10 60 40

15
CAHP-80-10
CAHP-120-10
380V
3N~60Hz 6 4 6 6 4 6 40 40
220V~
1N~60Hz 16 16 16 10 10 10 80 50
400V
3N~50Hz 6 4 6 6 4 6 40 40
230V~
1N~50Hz 16 16 16 10 10 10 80 50
CAHP-80-12
CAHP-120-12
380V
3N~60Hz 6 4 6 6 4 6 40 40
220V~
1N~60Hz 16 16 16 10 10 10 100 50
400V
3N~50Hz 6 4 6 6 4 6 40 40
230V~
1N~50Hz 16 16 16 10 10 10 100 50
Table 4.2 Power Supply Specification for CAHP120C
Unit
Model
Power
Supply
Cable Size (mm2)
(Plastic Insulation and Conduit)
Air Breaker Capacity
(A) Current
Leakage
Protection
Two Elements
Working Mode
One Element
Working Mode Two
Elements
One
Element
Phase
Wire
Neutral
Wire
Ground
Wire
Phase
Wire
Neutral
Wire
Ground
Wire
CAHP120C06
400V
3N~50Hz 2.5 2.5 2.5 2.5 2.5 2.5 25 25
30mA
Less than
0.1s
230V~
1N~50Hz 10 10 10 10 10 10 50 30
CAHP120C08
400V
3N~50Hz 4 2.5 4 4 2.5 4 30 30
230V~
1N~50Hz 16 16 16 10 10 10 60 40
CAHP120C10
400V
3N~50Hz 6 4 6 6 4 6 40 40
230V~
1N~50Hz 16 16 16 16 16 16 80 50
CAHP120C12
400V
3N~50Hz 6 4 6 6 4 6 40 40
230V~
1N~50Hz 16 16 16 16 16 16 100 50

16
2. Access to the connection terminal for CAHP-80/120 units with following steps.
ķRemove the top service panel with reference to figure 4.1;
ĸRemove the cover of control box with reference to figure 4.1;
ĹScrew out the cable connector with reference to figure 4.2.
3. Run the main power cord through the cable connector with reference to figure 4.3.
Figure 4.1 Figure 4.2
Figure 4.5
Cable Connector of
Circulating Pump
Cable Connector
of Display Box
Power Cord
Control Box CoverControl Box Cover
Top Service Panel
Figure 4.3
Top Service Panel
Cable Connector
of Power Cord
Control Box Cover
of Display Box
Power Cord
Figure 4.6
Figure 4.4
Cable Connector of
Circulating Pump
Cable Connector
Cable Connector
of Power Cord

17
4. Access to the connection terminal for CAHP-120C units with following steps.
ķRemove the top service panel with reference to figure 4.4;
ĸRemove the cover of control box with reference to figure 4.4;
ĹScrew out the cable connector with reference to figure 4.5.
5. Run the main power cord through the cable connector with reference to figure 4.6.
6. Connect the terminal block with wires with reference to figure 4.7 or figure 4.8.
Figure4.7 Figure4.8
When connect to the power supply of 220V 1N~60Hz or 230V 1N~50Hz, the size of
bridging wire on the terminal block should be as follows:
CAHP-80/120-6/8 6 mm2
CAHP-80/120-10/12 10 mm2
Neutral Wire
Ground WireWiring
Block Bridging Wire
WARNING: *An air breaker and an appropriate current leakage protector must be installed
outside the water heater as the requirement of power supply specification table for your
security.
*The water heater must be grounded permanently. Otherwise, it can result in electric
shock, injury or death.
WARNING: *Do not connect the water heater to the power supply, unless the tank has
been completely filled with water and a T&P valve has been installed.
*Water temperature over 50 can cause severe burns instantly or death from scalds.ć
Children, the disabled and elderly are at highest risk of being scalded. Feel water
temperature before bathing or showering.
Wire Connection for Voltage of
380V/3N/60Hz & 400V/3N/50Hz
Phase
Wire Pump Wire (Optional)
Power Supply
Ground Wire
Neutral Wire
Pump Wire (Optional)
Power Supply
Wire Connection for Voltage of
220V/1N/60Hz & 230V/1N/50Hz
Live Wire

18
4.3 Water Circulating Pump Connection
1. You can decide whether a water circulating pump is necessary based on your need.
2. The power supply of controlling wire output of a water circulating pump is rated 220V
1N~60Hz or 230V 1N~50Hz. If a water circulating pump is employed, and its power is 120W
or less than 120W, the connecting wire of the pump on the terminal block can be used as the
power cord of the pump; if its power is more than 120W, the connecting wire should be used
only as the control wire, other than the power supply.
3. The contactor of the pump can be installed either inside or outside of the control box on the
water heater.
4. Water circulating pump connection is illustrated in figure 4.9.
Figure 4.9
4.4 Display Box Installation
1. Important Information
zThe display box should not be located in an area where the combustible gas may leak.
Once the gas leaks and remains around the display box, it can result in fire.
zThe display box should be located in an area that is free from oil, vapor or sulfur.
Otherwise it can result in product deformation causing fault.
zThe display box should be located in an area that is well ventilated and dry and avoid
storage in direct sunlight.
zProtect the display box during installation process and keep it away from dust. Do not
touch electrical parts. Otherwise the display box would be damaged.
zThe display box is connected in low voltage circuit, and contact with high voltage circuit
that is rated more than 220V is forbidden. The communication cable of display box
should not in the same conduit with voltage lines, and the distance between conduits
should be 300~500mm or larger.
zThe inner diameter of communication cable conduit should be larger than 20mm.
zExcessive connection or lengthening connection is forbidden in the connecting wire of
the display box.
zDo not check the display box for electrical insulation with a megger after installation.
zThe dimensions of the display box are: 162×122×23 with frame and 146×106×23 without
a frame.
zIf the display box can be installed without running the communication cable through the
conduit, please ignore the following installation process for communication cable. If the
communication cable must be removed from the display box or from the main control
board before being fixed, refer to the following installation process.
2. Communication Cable Connection
A˖Outlet Terminal of Pump Controlling
Wire on the Terminal Block
L1˖Terminal of Pump’s Main Power
N˖Terminal of Neutral Wire
K˖Coil of Contactor
K-1˖Contact of Contactor
M˖Water Circulating Pump
S˖Temperature Switch (Optional)

19
Remove the front cover of display box and remove the display board with reference to
figure 4.10 and figure 4.11.
Remove the four connecting wires from the display board. The communication wire is
completely removed from the display box now. Then run the communication cable through
the prepared conduit. Complete the fixing of communication cable before performing the
following process.
The communication cable runs through the back cover of the display box and the hole in
the front cover with reference to figure 4.12 and figure 4.13.
Install the communication cable on the terminal block on the right of display board (keep
the label of wire corresponding to letters in terminal block) as illustrated in figure 4.14. Keep
the display board without dust. Install the display board on the front cover of display box again
after installing the communication cable, and tie the communication cable at the clip with
reference to figure 4.15.
Front Cover of the
Display Box
Remove the
Display Board.
Figure 4.10 Figure 4.11
Remove the front cover upward with a
straight screwdriver during installation.
Keep one knockout hole while
install stripped wire.
Communication
Cable
Back Cover of the
Display Box
Communication Cable
Figure 4.12 Figure 4.13
Front Cover of the
Display Box