Control; Integral Control Concept; Control Principle Diagram - Sinclair S therm Series Service Manual

Control

1 Integral Control Concept

1.1 Control Principle Diagram

Control Diagram
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(1) The outdoor 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 electrostatic 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 defrost 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.
(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.
S therm
RS485
S therm
Output Control
Field Supply
Main Board
Field Supply
Input Control
62
Power
Supply