Air-to-water Heat Pump Split Versati
21
SPLIT TYPE
Control
1 Integral Control Concept
1.1 Control Principle Diagram
Main Board
Input Control
Output Control
Power
Supply
RS485
Main Unit
Field Instalaltion
Main Unit
Field Instalaltion
(1)
The environment temperature is detected by the sensor installed at fins of the finned heat exchanger, which
is mainly used to control the initialization steps of the fan and the electronic expansion valve and also limit
the maximum running frequency of the compressor. When this sensor fails, the main board will detect it and
deliver this error message to the controller and then the unit will fail to start up or shut down.
(2)
The defrosting temperature is detected by the sensor installed at the defrosting pipes of the finned heat
exchanger, which is mainly used to control defrosting. When this sensor fails at the heating 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.
