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

Heat pump water heater

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Summary of Contents for A.O. Smith CAHP-120C Series

Page 2: Table Of Contents
TABLE OF CONTENTS 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 .......................
Page 3: Important Safety Information
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. Under 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.
Page 4 need. The 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. Damaged wires or ageing, loosening or unfastened power supply plug should not be used.
Page 5: Physical And Technical Specifications
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 Tank Maximum Service Relief Valve Water Outlet Water Inlet Relief Valve Maximum Height Diameter Depth Panel Width Height Height Height Angle (°) Width...
Page 6 Power 220V/1N/60Hz 9.7 (5.9) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7) 400V/3N/50Hz 9.3 (5.5) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3) 230V/1N/50Hz 9.3 (5.5) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3) 380V/3N/60Hz 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13) 220V/1N/60Hz 10.13 (7.13) 12.13 (8.13) 14.13 (9.13) 16.13 (10.13)
Page 7 (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. 2.2 CAHP-120 Physical and Technical Specifications Figure 2.3 Figure 2.4...
Page 8 Heating 220V/1N/60Hz 4.13 Capacity 400V/3N/50Hz 230V/1N/50Hz 380V/3N/60Hz 9.7 (5.9) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7) 220V/1N/60Hz 9.7 (5.9) 12.3 (7.2) 14.8 (8.5) 17.4 (9.7) Unit Maximum Power 400V/3N/50Hz 9.3 (5.5) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3) 230V/1N/50Hz 9.3 (5.5) 11.9 (6.8) 14.4 (8.1) 17.0 (9.3) 380V/3N/60Hz...
Page 9 Power Supply Specification 220V/1N/60Hz&380V/3N/60Hz&230V/1N/50Hz&400V/3N/50Hz Water Inlet NPT 3/4 (Female Thread) Connection Water Outlet NPT 3/4 (Female Thread) Size 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...
Page 10 Unit Maximum Heating Capacity 14.5 (11.5) 16.5 (12.5) 18.5 (13.5) 20.5 (14.5) Maximum 400V/3N/50Hz 15.8 26.3 31.5 Operation 230V/1N/50Hz 47.1 (31.3) 57.5 (36.5) 68.1 (41.8) 78.5 (47) Current Refrigerant R134a Refrigerant Charge Quantity 2100 Electrical Heating Capacity 6 (3) 8 (4) 10 (5) 12 (6) Tank Capacity...
Page 11: Installation Instructions
3 Installation Instructions 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 5 .
Page 12 It 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. Do not install the heater under the eave except some solution is taken to avoid the rain dropping on the unit.
Page 13 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.
Page 14 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 T&P Relief Valve Handle...
Page 15: Electrical Connection Instructions
4 Electrical Connection Instructions 4.1 Important 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.
Page 16 380V 3N~60Hz 220V~ CAHP-80-10 1N~60Hz CAHP-120-10 400V 3N~50Hz 230V~ 1N~50Hz 380V 3N~60Hz 220V~ CAHP-80-12 1N~60Hz CAHP-120-12 400V 3N~50Hz 230V~ 1N~50Hz Table 4.2 Power Supply Specification for CAHP120C Cable Size (mm Air Breaker Capacity (Plastic Insulation and Conduit) Current Unit Power Two Elements One Element Leakage...
Page 17 2. Access to the connection terminal for CAHP-80/120 units with following steps. Remove the top service panel with reference to figure 4.1; Remove the cover of control box with reference to figure 4.1; Screw out the cable connector with reference to figure 4.2. 3.
Page 18 4. Access to the connection terminal for CAHP-120C units with following steps. Remove the top service panel with reference to figure 4.4; Remove the cover of control box with reference to figure 4.4; Screw out the cable connector with reference to figure 4.5. 5.
Page 19 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;...
Page 20 Remove the front cover of display box and remove the display board with reference to figure 4.10 and figure 4.11. Figure 4.10 Figure 4.11 Front Cover of the Display Box Remove the Display Board. Remove the front cover upward with a straight screwdriver during installation.
Page 21 Figure 4.14 Figure 4.15 Communication Cable Communication Cable Clip Display Board Front Cover of the Display Box 3. Display Box Installation The installation of display box is classified revealed installation and concealed installation. The revealed installation is illustrated in figure 4.16. Figure 4.16 Back Cover of the Display Box...
Page 22 one connector in the main control board. There are two connectors applicable for display board and select one for connection.
Page 23: Operation Instructions
5 Operation Instructions The water heater has an adjustable thermostat to control water temperature. The hot water for automatic dishwashers and washing machines can cause severe injury or death from scalds. Temperature that causes injury varies from age of people and contact time. Disabled persons are at higher risk of being scalded for slow reflection.
Page 24 unit. The overall look of user interface is illustrated in figure 5.1. Refer to figure 5.2 for the overall look of homepage. Figure 5.1 Liquid Crystal Display Area Buttons Figure 5.2 Alarm Lock Mode Mode Icon Icon Icon Instruction Actual Temperature Display Time Indicator...
Page 25 2. Main Menu Instructions Press the button of MENU on the homepage to enter the main menu interface illustrated in figure 5.3. The five lines that cursor stops are menu details. Refer to the display on the right for the details of selected sub menu. Figure 5.3 3.
Page 26 Figure 5.5 5. Timer Setting Press the button of to select the sub menu of TIMER on the main menu interface, and then press the button of SET to enter the menu of timer setting illustrated in figure 5.6. There are two timer intervals, timer 1 and timer 2. Each timer has two statuses, disabled and enabled.
Page 27 Figure 5.7 Figure 5.8 6. Water Circulating Pump Setting Press the button of to select the sub menu of PUMP on the main menu interface, and then press the button of SET to enter the pump parameters setting interface. Press the button of to select the sub menu of START/STOP on the pump setting menu interface.
Page 28 two options, smart and standard. In smart mode, it will calculate the pump operation time automatically by the parameters defined by setting menu in figure 5.15. In standard mode, the pump will operate according to setting time. Press the button of to select the mode.
Page 29 Press the button of OK to confirm the water circulating parameters setting. Press the button of EXIT to return to the last menu interface illustrated in figure 5.14. Press the button of to select the sub menu of STANDARD as illustrated in figure 5.16 and then press the button of SET to enter the pump parameters setting menu interface in standard mode illustrated in figure 5.17.
Page 30 By the way, A.O. Smith reserves the right to change the version numbers and the codes at any time without notice. Press the button of EXIT to return to the last menu interface.
Page 31 Figure 5.25 Figure 5.26 If the password is wrong, it will show WRONG as illustrated in figure 5.27. Press the button of OK to input the correct password again. Press the button of EXIT to return to the main menu interface and other buttons are invalid. Figure 5.27 If the password is right, the interface would be changed to figure 5.28.
Page 32 Figure 5.30 Press the button of to select the sub menu of SET FREQ on the maintenance menu as illustrated in figure 5.31. Press the button of SET to select the power frequency. There are two power frequencies for option. The factory defaults are different for different areas.
Page 33 Press the button of EXIT to return to the last menu interface. The version numbers will change once the software is updated. A.O. Smith reserves the...
Page 34 right to change the version numbers and the codes at any time without notice. Figure 5.40 Figure 5.41 Press the button of to select the sub menu of ADMIN on the maintenance menu as illustrated in figure 5.42. Press the button of OK to enter the maintenance menu interface.
Page 35 Figure 5.45 Figure 5.46 FIN TEST 1, FIN TEST 2 and SET FREQ are the same with CAHP80/120 units. Press the button of to select the sub menu of CLR FAULTS on the maintenance menu as illustrated in figure 5.47. Press the button of OK to clear all the recorded faults. Figure 5.47...
Page 36: Maintenance Instructions
6 Maintenance Instructions CAUTION: This water heater should be maintained by a qualified person. Failure to follow these instructions can result in severe injury or property loss. WARNING: Disconnect the power supply to the water heater before maintaining the water heater.
Page 37 3. Complete the cleaning. Close the drain valve and remove the soft tube. Connect the water heater to the power supply. 6.3 Cleaning the Precipitation The sandy particles which are included in the impurities of water will deposit on the bottom of the tank and produce precipitation.
Page 38 8. After finish dissolving or cleaning, wash the section of the heating element with water. 9. Clean the precipitation and the scale on the bottom of the tank from the hole of the heating elements or the drain valve. Open the cold water inlet valve and the drain valve to help the cleaning.
Page 39: Trouble Shooting Instructions
7 Trouble Shooting Instructions 7.1 General Perform the following inspections, try to find the reasons of the faults and correct them before asking the service for the water heater. Perform as this check list before asking for service for the water heater, the hot water supply would probably be recovered quickly and it may be unnecessary to call for service.
Page 40 drained by the T&P relief valve, or otherwise the water heater or the tube system will be damaged. For this condition, refer to the local code or consult with the inspection agency to determine which system can be accepted in the area. This includes: a) Install the second T&P relief valve and set the pressure lower than the pressure setting of the first T&P relief valve.
Page 41 UP ELEMT LOST Upper element is unconnected. Call the service phone. ST MACH ERR State machine redundant failed. Call the service phone. LOW SHORT Lower tank temperature sensor is short. Call the service phone. LOW OPEN Lower tank temperature sensor is open. Call the service phone.
Page 42: Appendix
8 APPENDIX 8.1 CAHP-80I/120I Wiring Diagram...
Page 43 8.2 CAHP-80T/120T Wiring Diagram...
Page 44 8.3 CAHP120C/3KW Wiring Diagram...
Page 45 8.4 CAHP120C/4KW/5KW/6KW Wiring Diagram...

This manual is also suitable for:

Cahp-120 series Cahp-80 series Cahp-80-6 Cahp-80-12 Cahp-80-10 Cahp-120-6 ... Show all