A.O. Smith CAHP-MC-38 Installation, Operation And Maintenance Instructions Download Page 50

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8 - Troubleshooting Instructions

12.1.

Error Code Trouble Shooting

Please try to do the trouble shooting based on the error code information before call the service call if

the central controller reported a error code.

CODE

ERROR DESCRIPTION

POSSIBLE REASONS

TROUBLE SHOOTING STEPS

Central Controller

E00-01

RESERVED

E00-02

RESERVED

E00-03

RESERVED

E00-04

RESERVED

E00-05

TANK TEMPERATURE SENSOR

ERROR

Loose wiring.

Bad temperature sensor.

Inspect the wiring and fix

them.

Replace the temperature

sensor.

E00-06

AUXILIARY HEATER TANK

TEMPERATURE SENSOR ERROR

E00-07

AUXILIARY HEATER FLOW SWITCH

ALARM

Loose wiring.

No water, the valve had

been opened fully.

Too small water flow rate,

blocked water filter.

Bad switch.

Inspect the wiring and fix

them.

Inspect the piping system

and make sure all the valves

are fully open.

Clean the water filter.

Replace the switch.

E00-08

TANK TEMPERATURE OVERHEAT

EEROR

Too hot water from auxillary

heater.

Inspect the control circuit of the

auxillary heater.

E00-09

AUXILIARY HEATER FLOW SWITCH

LOCK

There are three times of E00-07

happpened within one hour.

Power off and power on the

central controller. If there is still

E00-07 reported, please refer to

the trouble shooting method of

E00-07.

E00-10

ABNORMAL TANK TEMPERATURE

Abnormal installation of the

tank temperature sensor or

control temperature sensor.

Bad tank temperature

sensor or control

temperature sensor.

Inspect the two temperature

sensors installation on the

tank.

Replace the tank

temperature sensor or

control temperature sensor.

E00-11

SYSTEM WATER FLOW ERROR

All the heat pump units has water

flow switch error three times

within one hour.

Inspect the heat pump water

piping line as per E0X-11 trouble

shooting.

E00-12

HIGH VOLTAGE ALARM

The power supply voltage is

higher than 264V.

Inspect the power supply system.

E00-13

LOW VOLTAGE ALARM

The power supply voltage is

lower than 187V.

E00-14

CONDENSER CLEAN ALARM

Scalling condenser.

Clean the condenser.

HEAT PUMP 0X

（

01~08

）

E0X-00

COMMUNICATION ERROR

No power supply to the heat

Inspect the power supply to

Summary of Contents for CAHP-MC-38

Page 1: ...INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS AIR TO WATER HEAT PUMP WATER HEATER CAHP MC 38 ...

Page 2: ... 1 11 WATER PUMP SELECTION 16 1 12 TANK DESIGN 16 1 13 TANK INSTALLATION 18 1 14 WATER REQUIREMENT 19 1 15 WATER FLOW SWITCH INSTALLATION 19 1 16 ELECTRICAL CONNECTION 20 1 17 SERIES NUMBER SETTING 22 1 18 TRIAL OPERATION 23 1 19 INSPECTION PRIOR TO TRIAL OPERATION 23 1 20 TRIAL OPERATION 24 6 OPERATION INSTRUCTIONS 25 6 1 UIM AND BUTTON DESCRIPTION 25 6 2 UIM INTERFACE INTRODUCTION 26 6 3 MAIN ME...

Page 3: ...NA NORMAL 52 12 3 OTHER PHENOMENA ABNORMAL 53 9 APPENDIX 55 12 4 HEAT PUMP UNIT WIRING DIAGRAM 55 12 5 CENTRAL CONTROLER WIRING DIAGRAM 56 12 6 COMMUNICATION WIRING DIAGRAM AMONG MUTILPLE UNITS 56 10 PACKING LIST 58 22 1 PACKING LIST OF THE HEAT PUMP UNIT 58 22 2 CENTRAL CONTROLLER KIT 58 ...

Page 4: ...erate the heat pump units based on the instructions illustrated in this manual Do 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 Please perform inspection and necessary maintenance regularly after the installation and operation of the water heater If you find the water heater operate abnormally stop the...

Page 5: ...nd operation instructions outlined in this manual A O SMITH WATER HEATER COMPANY LTD reserves the final power of 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 are...

Page 6: ...2 Physical Dimensions Picture 2 1 Unit Dimensions ...

Page 7: ...NTITY R410a 6 2kg REFRIGERANT SIDE DESIGN PRESSURE HIGH SIDE 4 2 Mpa LOW SIDE 3 1 Mpa WATER SIDE DESIGN PRESSURE 1 0 Mpa WATER SIDE PRESSURE DROP 3 45 kPa WATER CONNECTION SIZE DN40 R1 1 2 WATERPROOF CLASS IPX4 NET WEIGHT 287 kg DIMENSIONS L x W x H 1020 x 846 x 1840 mm Table 3 1 Heat Pump Technical Specifications Note 1 Rated condition Ambient temperature 20 15 dry wet bulb water temperature 47 5...

Page 8: ... previous setting during abnormal power off 1 3 Auxiliary heaters The heat pump heating capacity will decrease when the ambient temperature decreases Auxiliary heaters should be equipped to improve the heating capacity and ensure the hot water supply if the minimum ambient temperature is lower than 10 Celsius Either electric heater or gas heater could be used as auxiliary heater The central contro...

Page 9: ...he drainage system to make sure there will be no water accumulated during the operation of the heat pump units Please install the isolation device if the system is installed in locations where is easily to be accessed by personnel Please install the system in areas where is free from oil salt ocean area sulfide gas and any other circumstance which contains corrosive gases 1 5 Space Requirements 1 ...

Page 10: ...pt higher than the maximum snow or rain depth of the area to avoid the units to be immersed by snow or rain 1 6 Unit Movement 1 The heat pump units have been equipped with multiple protection packages Please use forklift crane to move them in the field Please do not remove the package before the units are located correctly 2 Please keep the heat pump units in horizontal status during the movement ...

Page 11: ...Piping Connection Each A O Smith hot water system could be equipped with maximum eight heat pump units and the system could be controlled by one central controller An auxiliary heater is requested as backup if the minimum ambient temperature is lower than 10 Celsius A O Smith central controller is deigned to be able to support on three types of auxiliary heaters 1 Storage heater This type of auxil...

Page 12: ...system as illustrated in picture 5 4a or 5 4b A flow switch is requested to be installed at the outlet piping 3 Static heating element This type of auxiliary heater could be installed inside of the tank as illustrated in picture 5 4c for vertical tank and 5 4d for horizontal tank Please determine the installation height based on the actual needs Please read information in chapter 5 9 for the tank ...

Page 13: ...Picture 5 4b ...

Page 14: ...Picture 5 4c ...

Page 15: ...t Piping 1 DN40 DN40 2 DN65 DN65 3 DN80 DN80 4 5 DN100 DN100 6 8 DN125 DN125 Table 5 1 Main Inlet Outlet Piping Size of the Hot Water System Please size the piping for the auxiliary heater based on the auxiliary heater capacity and size the hot water supply piping size based on actual situation Please refer to table 5 2 as the typical hot water flow velocity Piping OD DN 15 20 25 40 50 Flow Veloci...

Page 16: ... is installed in the area with the minimum ambient temperature lower than 0 Celsius insulation is also required on the cold water piping Please refer to table 5 4 for the hot water piping insulation requirement Hot Water Piping Size mm 15 20 25 50 65 100 100 Neoprene Insulation Thickness mm 20 30 40 50 Table 5 4 Neoprene Insulation Thickness for Hot Water Piping 1 11 Water Pump Selection Please re...

Page 17: ...Picture 5 5a Picture 5 5b 1 Please design and manufacture the tank complying with all the local regulations 2 Please design the tank with 1 0MPa design pressure ...

Page 18: ...tank as possible Design the hot water connections as far as possible from cold water connections to avoid the cold water mixing with hot water For vertical tank the hot water connections could be designed slightly higher than the cold water connections to avoild water mixing as shown in picture 5 5a h Design the E2 connection tank temperature sensor installation at the top of the tank Design the E...

Page 19: ...switch should be installed at a location which has straight pipe at both inlet and outlet side The minimum straight pipe length needs to be longer than 5 times of the pipe diameter Picture 5 6 Please wire the water flow switch with reference to the heat pump wiring diagram and the yellow line should be connected to the D16 terminal and the red line should be connected to one of the GND terminal Th...

Page 20: ...ction devices must comply with the requirement from local domain The wiring job could only be performed by qualified electric technician with reference to the system wiring diagram Please install the leakage protection device as per the requirement from the local domain Please run the power supply cable and the communication cable in a neat clean way and make sure the cables will not touch the pip...

Page 21: ...r temperature sensor cable 2 1 mm2 20m 100m Auxiliary heater control cable 2 1 5mm2 100m Auxiliary heater flow switch cable 2 1 5 mm2 100m Shorted if the auxiliary heater is storage gas heater Circulation pump control cable 1 1 5 mm2 100m Auxiliary heater pump control cable 1 1 5 mm2 100m Return water solenoid valve or pump control cable 1 1 5 mm2 100m Table 5 7 Hot Water System Low Voltage Cables...

Page 22: ... auxiliary heater auxiliary heater pump hot water return pump etc Please refer to table 5 8 for the power supply requirement of these equipment Equipment Power Supply Requirement Remarks Heat pump unit 380V 3N 50Hz Central controller 220V 50Hz Circulation pump 220V 50Hz or 380V 3N 50Hz Refer to the actual pump specifications Auxiliary heater gas storage heater 220V 50Hz Refer to the actual heater ...

Page 23: ... correct status 3 Whether the insulation has been done on the piping correctly Power system inspection Please inspect the following items on the power system 1 Whether the power supply voltage is within the specified range 2 Whether all the wirings have been tightened reliably 3 Inspect all the wiring with reference to the wiring diagram 4 Whether the system has been grounded reliably 5 Whether th...

Page 24: ...ue the operation and monitor the outlet temperature Check whether the fan is rotating without any abnormal noise If the system is operating normally please record the unit operation status ambient temperature heat pump inlet outlet temperature tank temperature Do the system setting check the system operation parameters through the display of the central controller with reference to chapter 6 A ser...

Page 25: ...iption Button Function Description Direction Button Up Down Roll the scroll bar to select the menu items adjust the setting parameters Function Button Turn on off the hot water system Select the menu items Modify the parameters Each specific button function is corresponding to the related content on the LCD display area A O SMITH HOT WATER SYSTEM ON FUNC HELP TANK TEMP 50 AMBIENT TEMP 22 HEAT PUMP...

Page 26: ...atures from all the heat pumps It will display 10 if all the heat pump units have the ambient sensor fault HEAT PUMP Display the current status of the heat pump units There are totally six status which are OFF HEATING DEFROST ANTI FRZ Anti Freezing STANDBY SWITCH AUX HEATER Display the status of the auxillary heating equipment If the hot water system is installed with a auxillary heating equipemtn...

Page 27: ...ation from the heat pump units this icon will be displayed diamatically size change and the timer function will be disabled Area Function Buttons Display ON Display ON when the system is off To turn on the system press the button below this icon Display OFF when the system is on To turn off the system press the button below this icon FUNC Press the button below this icon to enter the related funct...

Page 28: ...ll display if there is an error on the temperature sensor AUTO ON TIME When the timer function is enabled it will display the time set by the user to turn on the system Otherwise it will display NONE AUTO OFF TIME When the timer function is enabled it will display the time set by the user to turn off the system Otherwise it will display NONE Area Time information TIME The same as Main Page Descrip...

Page 29: ...er and the hot water system HEAT PUMPS STATUS The status parameters of the heat pump units HEAT PUMPS CONFIG Settings related to the heat pump units operation Need a password to enter the menu Note Select the menu item by pressing the Up Down buttons When the menu is selected it will be highlighted with the white background then press the SELECT button to enter the menu or press BACK to return to ...

Page 30: ...led Please refer to Timer Setting section for detailed setting method AUTO ON OFF ENABLE AUTO ON OFF ENABLE is used to enable or disable the hot water system automatic operation Setting Options ON OFF Default Option OFF The setting process is similar as Summer Tank Temperature Setting CURRENT TIME SETTING AUTO ON OFF ENABLE is used to set the clock time of the central controller Please refer to Ti...

Page 31: ... for detailed setting method CLEAR HEAT PUMP FAULTS CLEAR HEAT PUMP FAULTS is used clear the fault information of the heat pump units Please refer to CLEAR HEAT PUMP FAULTS OPERATION section for detailed setting method CLEAR FAULTS HISTORY CLEAR FAULTS HISTORY is used to clear the historical fault information Setting method Please refer to CLEAR FAULTS HISTORY OPERATION section for detailed settin...

Page 32: ...ion between the control board and the display board of the central controller The SUMMER SETPOINT will be updated after the successful modification Note WINTER SETPOINT AUTO ON OFF ENABLE USER PUMP ON INTVL USER PUMP ON TIME AUX HEATER AT H AMB have the similar operation procedures USER SETTING MODIFY BACK HELP 时间设置 AUTO ON OFF ENABLE OFF SUMMER SETPOINT 46 AUTO ON OFF SETTING CURRENT TIME SETTING...

Page 33: ...ew setting or press the CANCEL button to cancel the modification The new setting will be sent to the MCB main control board of the controller if the ENTER button is pressed in the previous step and the UIM will display COMMAND SENDING The modification is successful if the UIM display SUCCEEDED If the UIM display FAILED it indicates the modification is unsuccessful please check the communication be...

Page 34: ...NTER button to save the new setting or press the CANCEL button to cancel the modification The new setting will be sent to the MCB of heat pump unit 1 if the ENTER button is pressed in the previous step and the UIM will display COMMAND SENDING The modification is successful if the UIM display SUCCEEDED If the UIM display FAILED it indicates the modification is unsuccessful please check the communic...

Page 35: ...ul if the UIM display SUCCEEDED If the UIM display FAILED it indicates the resetting is unsuccessful please check the communication between the central controller and the heat pump units Press BACK button to return to the previouse UIM interface USER SETTING AUTO ON OFF ENABLE OFF USER PUMP ON INTVL 30min USER PUMP ON TIME 20min HX CLEAN RESET AUX HEAT AT H AMBT OFF HX CLEAN RESET CONDENSER CLEAN ...

Page 36: ... it indicates the clearing is unsuccessful please check the communication between the central controller and the heat pump units Press BACK button to return to the previouse UIM interface Note The fault information of ALL the heat pump units will be cleared after this operation USER SETTING USER PUMP ON INTVL 30min USER PUMP ON TIME 20min AUX HEAT AT H AMBT OFF CLEAR HEAT PUMP FAULTS HX CLEAN RESE...

Page 37: ... UIM display SUCCEEDED If the UIM display FAILED it indicates the clearing is unsuccessful please check the communication between the control board and the display board of the central controller Press BACK button to return to the previouse UIM interface CLEAR FAULTS HISTORY CLEAR ALL THE FAULTS HISTORY SUCCEEDED CLEAR FAULTS HISTORY CLEAR ALL THE FAULTS HISTORY COMMAND SENDING USER SETTING USER P...

Page 38: ... The UIM will enter the MAINTENANCE SETTING interface if the password is correc and display the following alarm information otherwise Press the BACK button to return to the main menu interface if the password is incorrect Reselect the MAINTENANCE SETTING menu to reinput the password MAIN MENU SELECT BACK HELP MAINTENANCE SETTING HEAT PUMPS CONFIG PARAMETER VIEW HEAT PUMPS STATUS USER SETTING Pictu...

Page 39: ...t have sufficient water flow during the operation period Setting Range 4 500 Seconds Default Value 70 CIR PUMP DELAY OFF CIR PUMP DELAY OFF is reserved for unpressurized tank system and it could not be set for pressurized tank system MEMORY FUNCTION MEMORY FUNCTION could be set as ON or OFF which indicate whether the controller would remember the settings during the power off period If it is set a...

Page 40: ...tem which could enforce a defrosting cycle even the heat pump unit does not have defrosting request Please refer to MANUAL DEFROST OPERATION PROCESS section for detailed setting method HP TEMP ADJ HP TEMP ADJ is the parameter to adjust the maximum water temperature for the heat pump based on the total operation time It would be reset to 0 after the HX CLEAN RESET Setting Range 0 2 Default Value 0 ...

Page 41: ... pump should enter the defrosting cycle If the UIM display FAILED it indicates the manual defrosting is unsuccessful please check the communication between the central controller and the heat pump units Press BACK button to return to the previouse UIM interface Note This operation can t be selected when heat pump unit is ON MAINTENANCE SETTING AUX HEATER TYPE TANKLESS SELECT BACK HELP MANUAL DEFRO...

Page 42: ...lease check the communication Between the control board and display board of the central controller Press BACK button to return to the previouse UIM interface Note After this operation all the parameters of central controller except for the heat pump quantity will be reset to the ex factory settings MAINTENANCE SETTING MANUAL DEFROST SELECT BACK HELP EX FACTORY RESET AUX HEATER TYPE TANKLESS AUX H...

Page 43: ... PUMP STATUS displays the status of the circulation pump USER PUMP STATUS USER PUMP STATUS displays the status of the user pump AUX PUMP STATUS AUX PUMP STATUS displays the status of the auxillary heater pump HISTORY FAULT 1 HISTORY FAULT 1 displays the most recent fault information HISTORY FAULT 2 HISTORY FAULT 2 displays the 2 nd newest fault information HISTORY FAULT 3 HISTORY FAULT 2 displays ...

Page 44: ... unit status interface Menu description Heat Pumps Status MAIN MENU SELECT BACK HELP MAINTENANCE SETTING HEAT PUMPS CONFIG PARAMETER VIEW HEAT PUMPS STATUS USER SETTING Picture 6 13 Main Menu HP UNIT 2 STATUS NEXT PREV HELP HP STATUS HEATING COMPRESSOR ON FAN STATUS HIGH 4 WAY VALVE HEATING EEV STEPS 156 Picture 6 15 Heat Pump 2 Unit HP UNIT 1 STATUS NEXT BACK HELP HP STATUS HEATING COMPRESSOR ON ...

Page 45: ... reversing valve EEV STEPS EEV STEPS displays the actual openning of the electronic expansion valve WATER IN TEMP WATER IN TEMP displays the actual inlet water temperature of this unit WATER OUT TEMP WATER OUT TEMP displays the actual outlet water temperature of this unit AMBIENT TEMP AMBIENT TEMP displays the actual ambient temperature read by the ambient temperature sensor of this unit SUCTION T...

Page 46: ...ssing the UP DOWN button Press the NEXT button to the next heat pump configuration interface MAIN MENU SELECT BACK HELP MAINTENANCE SETTING HEAT PUMPS CONFIG PARAMETER VIEW HEAT PUMPS STATUS USER SETTING Picture 6 16 Main Menu HP UNIT 2 CONFIG SELECT BACK NEXT EEV SETTING TARGET SUPERHEAT 3 DEFROST SETTING Picture 6 18 2 Unit Parameter Setting Interface HP UNIT 1 CONFIG SELECT BACK NEXT EEV SETTIN...

Page 47: ...hod EEV Setting EEV CONTROL EEV CONTROL is used to set the control method of the electronic expansion valve it could be set as MANUAL for trouble shooting during service Setting Options AUTO MANUAL Default Option AUTO EEV INIT STEPS EEV INIT STEPS is the parameter which determines the initial openning of the electronic expansion valve during the unit start up period Setting Range 0 500 Steps Defau...

Page 48: ...M BEING FROZEN STANDBY THE HOT WATER SYSTEM IS NOT IN AN ACTIVE HEATING CYCLE USUALLY THIS MEANS THE TEMPERATURE IN THE TANK HAS REACHED A SUFFICIENT TEMPERATURE AND HAS NOT DROPPED LOW ENOUGH TO INITIATE A CALL FOR HEAT SETPOINT MODIFICATION THE TANK SETPOINT DETERMINES THE REGULATED TEMPERATURE FOR THE WATER IN TANK THIS PARAMETER IS ADJUSTED IN THE USER SETTING MENU TO ADJUST FOLLOW THESE STEPS...

Page 49: ...hen clean the coil with pressurized water Please avoild spraying detergent or water on the electrical components or wiring harnesses Please clean the condenser regularly every 2 to 6 months depends on the local water qualtity to ensure the efficient and safe operation of the heat pump unit Please inspect the major components of the system regularly and do the service or maintenance if there is any...

Page 50: ...illary heater Inspect the control circuit of the auxillary heater E00 09 AUXILIARY HEATER FLOW SWITCH LOCK There are three times of E00 07 happpened within one hour Power off and power on the central controller If there is still E00 07 reported please refer to the trouble shooting method of E00 07 E00 10 ABNORMAL TANK TEMPERATURE 1 Abnormal installation of the tank temperature sensor or control te...

Page 51: ...e valve had been opened fully 3 Too small water flow rate blocked water filter 4 Bad switch 1 Inspect the wiring and fix them 2 Inspect the piping system and make sure all the valves are fully open 3 Clean the water filter 4 Replace the switch E0X 12 HIGH PRESSURE ERROR 1 Loose wiring of the higher pressure switch 2 Too small water flow rate 3 Water filter block 4 Scalling condenser 5 Refrigerant ...

Page 52: ...erature sensors Improper installation of the water temperature sensors 2 The four way reversing valve is not in heating status 1 Inspect all the water temperature sensor installation on each heat pump unit and on the tank 2 Power on and power off the four way reversing valve for a few times E0X 21 AMBIENT TEMPERATURE OUT OF RANGE 1 The actual ambient temperature is out of 10 48 o C 2 Bad ambient t...

Page 53: ...supply error 2 Loose wiring 3 Bad fuse 4 Operation timer expired 1 Inspect the power supply 2 Inspect the wiring and fix 3 Replace the fuse 4 Check on the timer setting The circulation pump is operating but with abnormal noise 1 No water in piping system 2 Air in pipin system 3 The valves are not fully open 4 Blocked water filter 1 Inspect the water piping system 2 Exhaust the air from the piping ...

Page 54: ...4 Inproper setting point 5 Insufficient water exhaust the gas in the system Fan does not start 1 Bad fan contactor 2 Bad fan motor 1 Replace the fan contactor 2 Replace the fan motor ...

Page 55: ...9 Appendix 12 4 Heat Pump Unit Wiring Diagram Picture 9 1 Heat Pump Unit Wiring Diagram ...

Page 56: ...ng Diagram Note 1 Please use shielded cable for all the communication cables among heat pump units and central controllers and grounded the cable well The maixmum length of the communication cable should be shorter than 200 meters 2 One central controller could be connected to maximum eight heat pump units 3 Please do not connect the communication cable as following picture ...

Page 57: ...Picture 9 3 Incorrect Communication Cable Wiring ...

Page 58: ...nit 4 Flow Switch 1 To be installed on the pipe between the ouotlet water connection of the heat pump unit and the tank 5 Installation and Operation Manual 1 22 2 Central Controller Kit Description Quantity Instructions 1 Central Controller 1 2 Temperature Sensor Kit 3 Tank temperature sensor Control temperature sensor Auxilliary heater temperature sensor 3 Key Central Controller 2 Note One hot wa...

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