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

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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

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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

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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.

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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)

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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)

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(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

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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

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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)

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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.