Function Of Thermistor - Daikin FTKE25BVM Service Manual

Function of Main Structural Parts
2.2

Function of Thermistor

2.2.1 Heat Pump Model
A
Four-way valve
2
B
A Outdoor Heat 1. An outdoor heat exchanger thermistor is used for controlling a target discharge temperature.
Exchanger
Thermistor (DCB)
2. An outdoor heat exchanger thermistor is used for detecting a disconnected discharge pipe
B Discharge 1. Discharge pipe thermistor is used to control a discharge pipe.
Pipe Thermistor
(DOT)
2. A discharge pipe thermistor is used for detecting a disconnected discharge pipe thermistor.
C Gas Pipe 1. When cooling: a gas pipe thermistor is used for gas pipe isothermal control.
Thermistor (DGN)
86
Receiver
SV
Solenoid valve
3
D
Compressor
1
Set a target discharge temperature depending on an outdoor and indoor heat exchanger
temperature.
Control the electronic expansion valve opening so that the target discharge temperature can
be obtained.
thermistor when cooling.
When the temperature of the discharge piping is lower than the temperature of outdoor heat
exchanger, a disconnected discharge pipe thermistor can be detected.
If the temperature of discharge pipe (used in place of the inner temperature of the
compressor) rises abnormally, the operating frequency drops or the operation must be
halted.
Control electronic expansion valve opening so that a gas pipe temperature in each room
becomes equal.
Expansion valve
4
EV
A
EV
B
EV
C
EV
D
C
Si12-411A
E
D
(R2435)
Function and Control