Sinclair S-THERM GSH-100ERB, Service And Installation Manual, Page: 42 / 153

Control
Page 35 Total 145

complete electric connection diagram
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 defroste 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.
5. The temperature sensor at the economizer is used to detect the temperature of the economizer
after throttling via the electrostatic expansion 2. Under the Heating or Hot Water mode, this sensor and
that at the economizer outlet both are used to control the opening angle of the electrostatic expansion
valve 2. Under the Cooling mode, the electrostatic expansion valve 2 is fully closed.
6. The temperature sensor at the economizer outlet is used to detect the tmpeature of the outlet of the
economizer. Unde the Heating or Hot Water mode, this sensor and that at the economser inlet both are
used to control the opening angle of the electrostatic expansion valve 2. Under the Cooling mode, the
electrostatic expansion valve 2 is fully closed.
7. 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.
Component Range
High pressure sensor 4.5/3.8MPa
（
absolute
）
Low pressure switch
（
cooling
）
0.45/0.55MPa
（
absolute
）
Low pressure switch
（
heating
）
0.1/0.2 MPa
（
absolute
）
8. The return 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.
9. The supply 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.