SiSG121917E
Thermistor Functions
Part 4 Functions and Control
76
(5) Liquid Pipe
Thermistor
Liquid pipe thermistor is used to protect the compressor against liquid attack during cooling
operation.
In case of low outdoor temperature operation, the system compares the indoor heat
exchanger temperature with the liquid pipe temperature to detect disturbances in the
refrigerant flow. If any, the system adjusts the opening of the electronic expansion valve to
control the refrigerant flow.
(6) Indoor Heat
Exchanger
Thermistor
The indoor heat exchanger thermistor is used for controlling the target discharge pipe
temperature. The system sets the target discharge pipe temperature according to the
outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve
opening so that the target discharge pipe temperature can be obtained.
In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection
control. If the indoor heat exchanger temperature drops abnormally, the operating frequency
becomes lower or the operation halts.
In cooling operation, the indoor heat exchanger thermistor is used for anti-icing function. If
any of the following conditions are met in the room where operation halts, it is assumed as
icing.
The conditions are
Tc
– 1°C
Ta – Tc
10°C
where Ta is the room temperature and Tc is the indoor heat exchanger temperature.
The indoor heat exchanger thermistor is used for detecting incorrect wiring. During wiring
check operation, the indoor heat exchanger thermistor detects the heat exchanger
temperature. The heat exchanger temperature is used to check the wiring and the piping.
(7) Room
Temperature
Thermistor
The room temperature thermistor detects the room air temperature and is used for
controlling the room air temperature.
Содержание MKS-T Series
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