Unit Control
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or water heating mode, the compressor will stop and this error will be displayed at the controller. When it
fails at the cooling mode, the compressor continues to run but this error will be displayed at the
controller.
3. The discharge temperature is detected by the sensor installed at the discharge pipe of the
compressor, which is mainly used for high discharge temperature protection. When this sensor fails, this
error will be displayed at the controller, all loads except the water pump of the solar system and the
electric heater of the water tank will stop. Then, the main unit will resume normal running when this error
is eliminated.
4. The suction temperature is detected by the sensor installed at the suction pipe of the compressor,
which is mainly used to control superheating degree. When this sensor fails, this error will be displayed
at the controller, all loads except the water pump of the solar system and the electric heater of the water
tank will stop. Then, the main unit will resume normal running when this error is eliminated.
5. The high pressure is detected by the sensor installed at the discharge pipe of the compressor, the
low pressure is detected by the sensor installed at the suction pipe of the compressor, and the
enthalpy-adding pressure is detected by the sensor installed at the enthalpy-adding pipe. The first one is
mainly used for high pressure protection, the second one is mainly used to control defrosting, freeze
protection and superheating degree, and all of three are used to together to control the intermediate
pressure ratio of the compressor. When any of these sensors fails, it will be displayed at the controller,
all loads except the water pump of the solar system and the electric heater of the water tank will stop.
Among them, the water pump will stop 120 seconds later than the compressor. Then, the main unit will
resume normal running when this error is eliminated.
6. The entering water temperature of the plate heat exchanger is detected by the sensor installed at
the inlet pipe of the plate heat exchanger, which is mainly used for freeze protection. When this sensor
fails, this error will be displayed at the controller but the unit will resume normal operation.
7. The leaving water temperature of the plate heat exchanger is detected by the sensor installed at
the outlet pipe of the plate heat exchanger, which is mainly used for freeze protection at the water side.
When this sensor fails, this error will be displayed at the controller and the unit will continues to operate.
8. The auxiliary heater leaving water temperature is detected by the sensor installed at the outlet
pipe of the auxiliary heater, which is mainly used to control the leaving water temperature of the main
unit. When this sensor fails, this error will be displayed at the controller, all loads except the water pump
of the solar system and the electric heater of the water tank will stop (the 2-way electric and 3-way
electric valve will be closed).
9. The hi-pressure switch is used to judge the system pressure. When the pressure is too high, this
switch will disconnect and the unit will shut down.
10. The flow switch of the main unit is mainly used to judge the water flow. When the flow rate is too
low, this switch will disconnect, all loads except the water tank heater and the water pump of the solar
system will stop. This error will be displayed at the controller and will be unrecoverable. The unit can
restart only when it is repowered on and this error does not be displayed again.
Items from 1~10 listed above are control parameters input by the main unit.
11. The water tank temperature is detected by sensors immersed inside the water tank. These
sensors can be divided into two groups. Group 1 is used to control the water tank temperature and group
2 is used to display the water tank temperature. When group 1 fails at the heating mode, this error will be
displayed at the controller, and all loads except the water pump of the main unit will stop. When group 2
fails, this error also will be displayed at the controller but the unit continues normal operation.
12 The leaving and entering water temperature of the solar panel and also the solar panel
temperature are detected by sensors installed at the inlet pipe, outlet pipe and solar panel of the solar
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