This document describes a Household Air to Water Heat Pump User Manual for heating mode.
Function Description
The device is a household air to water heat pump designed for heating applications. It operates by transferring heat from the ambient air to water, which can then be used for various heating purposes. The system includes a compressor, circulating water pump, fan motor, and an auxiliary electric heater for the water tank. It is controlled via a wired panel with an LCD display.
Important Technical Specifications
- Controller Version: PC board: CG248021, LCD: CG248024
- Heat Pump Models: CGKS3.5, CGKS5.5, CGKS7, CGKS9
- Water Tank Temperature Setting (Heating Mode): 30℃~60℃ (Initial value: 55℃)
- Water Tank Temp Drop for Compressor Restart: 2℃~18℃ (Initial value: 5℃)
- Air Temp for Electric Heater Starting: 0℃~35℃ (Initial value: 5℃)
- Electric Heater Setting Temperature: 20℃~80℃ (Initial value: 55℃)
- Electric Heater Start Temperature Difference: 2℃~40℃ (Initial value: 5℃)
- Compressor Restart Time: Minimum 3 minutes after stopping.
- Circulating Water Pump Operation: Starts immediately on power-on request; delays 30 seconds to stop after compressor stops; runs continuously during defrosting.
- Fan Motor Operation: Starts 5 seconds before compressor; continues for 30 seconds after compressor stops; does not run during defrosting.
- Four-Way Valve: Not electrified in normal heating; electrified during automatic and forced defrosting.
- Automatic Auxiliary Electric Heater: Invalid if L5 is set to 0. Starts if air temperature ≤ L5 and water tank temperature < L3-L2. Stops if water tank temperature ≥ L3-1℃ or air temperature ≥ L5+2℃.
- Forced Auxiliary Electric Heater: Can be manually started. Heats water to preset temperature. Starts during automatic defrosting, manual defrosting, and second-grade anti-freeze conditions.
- Anti-freeze Protection: Activates when ambient temperature ≤ 2℃ (standby or power off). Water pump or entire heat pump may operate. Deactivates when ambient temperature > 2℃.
Usage Features
The heat pump offers various operational modes and settings accessible via the wired control panel.
Operating Panel Display:
- Indicators: Water pump, Defrost, Fan motor, Hot water mode, Electric heater.
- Readouts: Water tank temp, Outlet water temp, Clock, Timer.
- Status: Button lock, Need repair.
Buttons:
- Power Button:
- Unlocking state: Press for 1s to turn heat pump ON/OFF.
- Other setting states: Returns to main interface.
- Locking state: Press for 5s to unlock keys.
- M Button:
- Main interface: Enters heat pump status query.
- User parameters query interface: Enters current parameter setting.
- Timer setting interface: Press for 5s to cancel current group timer setting.
- + and - Buttons:
- Page forward/backward query, amend parameter values.
- Combine with M button for parameter query and setting.
- Power on state: Adjust current working mode water tank temperature setting.
- Clock Button:
- Press for 10s: Enters clock setting status.
- Press: Enters fixed ON/OFF time setting status (combines with + and - for setting 1st and 2nd groups).
- Timer setting: Enters timer group 1 setting, then group 1 ON/OFF timer setting.
Other Operations:
- Clock Setting: Press "clock" for 10s from main interface. Use "clock" to toggle between hour/minute, and +/- to adjust. Confirmed by pressing "clock" or automatically after 30s inactivity. "Power" button also confirms.
- Timer Setting (ON/OFF timer): Press "clock" from main interface to enter timer group 1 setting. Press "clock" again to set hour/minute for ON timer using +/-. Repeat for OFF timer. Confirmed by pressing "clock" or automatically after 30s inactivity. Settings are remembered even after power failure.
- Lock/Unlock Keys: Keys lock automatically after 60s inactivity. Press "Power" for 3s to unlock (a "beep" confirms).
- Forced Defrost: Press "-" for 3s while powered on. Quits automatically after 3min or when defrosting time is reached. Press "power" to quit immediately.
- Forced Electric Heater: Press "power" and "clock" simultaneously for 3s to start/stop.
- Remove History Error Code: Press "power" and "M" simultaneously for 5s at the history error code query interface.
Maintenance Features
The system includes various error codes and protection mechanisms to ensure safe operation and facilitate troubleshooting.
Error Codes and Protections:
- Er03 (Water Flow Switch Error):
- Condition: Water flow switch disconnects for 10s after circulating water pump starts.
- Action: Displays Er03, alarms, heat pump stops. Recovers automatically.
- Solve: Check water flow switch cable and water circulating system for blocks.
- Er05 (Outlet Gas Pressure Too High Protection):
- Condition: Outlet gas pressure switch disconnects during operation.
- Action: Displays Er05, alarms, heat pump stops.
- Recovery: Recovers automatically for the first two occurrences within 30min. Requires power cycle for subsequent occurrences.
- Solve: Check for small water flow issues.
- Er06 (Inlet Gas Pressure Too Low Protection):
- Condition: Inlet gas pressure switch disconnects during operation.
- Action: Displays Er06, alarms, heat pump stops.
- Recovery: Recovers automatically for the first two occurrences within 30min. Requires power cycle for subsequent occurrences.
- Solve: Check for gas leakage.
- Er09 (Communication Error and Protection):
- Condition: PC board doesn't receive signal from operating panel (first power-on) or operating panel doesn't receive signal from PC board (during power-on).
- Action: Operating panel stuck in full display (first power-on), or displays Er09. Heat pump operates based on last preset temperature.
- Recovery: Disappears when communication recovers.
- Solve: Check connections between PC board and display panel; replace damaged components.
- Er12 (Outlet Gas Temperature Too High Protection):
- Condition: Outlet gas temperature ≥ 110℃ for 10s.
- Action: Displays Er12, alarms, system stops.
- Recovery: Quits protection when outlet gas temperature ≤ 80℃. Recovers automatically for first two occurrences within 30min. Requires power cycle for subsequent occurrences.
- Solve: Check for small water flow issues.
- Er15 (Water Tank Temperature Sensor Error):
- Condition: Hot water tank temperature sensor is short circuit or open circuit.
- Action: Displays Er15, alarms, heat pump stops.
- Solve: Replace temp sensor.
- Er16 (Air Heat Exchanger Lowest Tube Temperature Sensor Error):
- Condition: Air heat exchanger lowest tube temperature sensor is short circuit or open circuit.
- Action: Displays Er16, alarms, heat pump continues to work.
- Solve: Replace temp sensor.
- Er18 (Outlet Gas Temperature Sensor Error):
- Condition: Outlet gas temperature sensor is short circuit or open circuit.
- Action: Displays Er18, alarms, heat pump stops.
- Solve: Replace temp sensor.
- Er21 (Ambient Air Temperature Sensor Error):
- Condition: Ambient air temperature sensor is short circuit or open circuit.
- Action: Displays Er21, alarms, heat pump continues to work.
- Solve: Replace temp sensor.
- Er27 (Outlet Water Temperature Sensor Error):
- Condition: Outlet water temperature sensor is short circuit or open circuit.
- Action: Displays Er27, alarms, heat pump stops.
- Solve: Replace temp sensor.
- Er29 (Inlet Gas Temperature Sensor Error):
- Condition: Inlet gas temperature sensor is short circuit or open circuit.
- Action: Displays Er29, alarms, heat pump continues to work.
- Solve: Replace temp sensor.
- Er44 (Ambient Air Temperature Too Low Protection):
- Condition: Ambient air temperature is lower than -10℃.
- Action: Displays Er44, alarms, heat pump stops, electric heater starts automatically.
- Recovery: Heat pump restarts when ambient temperature is higher than -8℃.
- Er45 (Outlet Water Temperature Too High Protection):
- Condition: Outlet water temperature ≥ 62℃ after compressor runs for 5min (heating/hot water mode).
- Action: Displays Er45, alarms, compressor and fan motor stop, water pump continues.
- Recovery: Quits protection when outlet water temperature is 57℃.
- Anti-freeze Protection:
- Condition: Ambient temperature ≤ 2℃ (standby or power off).
- Action: Heat pump enters anti-freeze state (no error code displayed). Water pump or entire heat pump may operate.
- Recovery: Quits automatically when ambient temperature > 2℃. No repair needed for this state.
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