Control Flowchart; Main Control Logics; Cooling - Sinclair S therm Series Service Manual

1.2 Control Flowchart

Cooling

3-Way Vavle and
2-Way Vavle
Control
Water Pump
Control
Water Flow
Switch Control
Electric
Expansion
Valve Control
Outdoor fan Motor
Control
Compressor
Control
Cooling
Operation

2 Main Control Logics

2.1 Cooling
2.1.1 Control to the Compressor
When the unit is controlled by the leaving water temperature, the compressor operating frequency will be
adjusted according to the temperature difference in direction proportion. (Temperature difference= actual leaving
water temperature-leaving water temperature set point).
2.1.2 Freeze Protection
When it is detected that the leaving water temperature of the plate heat exchanger is lower than the freeze
protection temperature, the compressor will drop its operating frequency until it reaches the minimum operating
frequency. Then if it is still detected that the leaving water temperature is lower than the freeze protection
Power Switch On
Operation Mode
Judgment
Heating
3-Way Vavle and
2-Way Vavle
Control
Error Water Pump
Indication Control
Error Water Flow
Indication Switch Control
Electric
Expansion
Valve Control
Error Outdoor fan Motor
Indication Control
Error Compressor
Indication Control
4-Way Valve
Control
Heating
Operation
Water Heating
3-Way Vavle and
2-Way Vavle
Error Water Pump
Indication
Error Water Flow
Indication Switch Control
Expansion
Valve Control
Error Outdoor fan Motor
Indication
Error Compressor
Indication
Error 4-Way Valve
Indication
Water Heating
65
Control
Error
Control Indication
Error
Indication
Electric
Error
Control Indication
Error
Control Indication
Error
Control Indication
Operation