Control Specification; Function Of Thermistor - Daikin 2MXS-N Series Service Manual

Control Specification

3. Control Specification

3.1

Function of Thermistor

(1)
Four way valve
(1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe
Exchanger
Thermistor
2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting the
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure protection.
(2) Discharge 1. The discharge pipe thermistor is used for controlling discharge pipe temperature. If the
Pipe Thermistor
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe
(3) Gas Pipe In cooling operation, the gas pipe thermistor is used for gas pipe isothermal control. The system
controls electronic expansion valve opening so that the gas pipe temperature in each room
Thermistor
becomes equal.
60
(2)
Compressor
The illustration is for the 4-room models as representative and have 4 lines
of indoor unit system (A ~ D). The 3-room models have 3 lines (A ~ C) and 2-room models have 2 lines (A ~ B).
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.
disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops
below the outdoor heat exchanger temperature by more than a certain value, the discharge pipe
thermistor is judged as disconnected.
discharge pipe temperature (used in place of the inner temperature of the compressor) rises
abnormally, the operating frequency becomes lower or the operation halts.
thermistor.
Electronic
expansion valve
(5)
EVA
EVB
EVC
EVD
D C
(3)
SiUS121502E
B A
(4)
(R17360)
Function and Control