Refrigerant System and Function of Functional Parts of Outdoor Unit Si18-201
106 Main Functions
1.3 Protective Devices, Thermistors, Sensors
AHPS
When the high pressure rose abnormally, HPS is actuated to stop the compressor.
B Low pressure sensor
Carries out controls such as low pressure protection (compressor protection), and ending
pump down operation, and judgement of gas shortage.
C Outdoor air thermistor
Carries out controls such as fan tap control (H/L switching), determination of initial
frequency, and compressor protection control.
D Outdoor unit heat exchanger thermistor
Carries out the target discharge pipe temperature control and the judgement of defrosting
start.
E Outdoor unit liquid pipe thermistor
In cooling operation, carries out the outdoor unit SC control (subcooling control) and the
judgement on defrost resetting.
F Discharge pipe thermistor
Carries out the compressor internal temperature protection control (operation halts due to
the discharge pipe abnormal high temperature, gas shortage, etc.)
Carries out the judgement of open-phase operation and the system control.
G Suction pipe thermistor
Carries out the pump down operation.
H Indoor unit room temperature thermistor
Instructs the capacity supply to BP unit using the room temperature.
I Indoor unit heat exchanger thermistor
Carries out various protection functions and controls of capacity (peak cut, freeze protection,
heat exchanger isothermal control in heating operation, target discharge pipe temperature
control, SH control in cooling operation, SC control in heating operation).
J BP unit liquid pipe thermistor
In heating operation, carries out the indoor unit SC control.
K BP unit gas pipe temperature thermistor
In cooling operation, carries out the indoor unit SH control and the cooling gas pipe
isothermal control.
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