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Function of Main Structural Parts
Si12-308
88
Function and Control
2.2
Function of Thermistor
2.2.1 Heat Pump Model
A Outdoor Heat
Exchanger
Thermistor
(DCB)
1. An outdoor heat exchanger thermistor is used for controlling a target discharge temperature.
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.
2. An outdoor heat exchanger thermistor is used for detecting a disconnected discharge pipe
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.
B Discharge
Pipe Thermistor
(DOT)
1. Discharge pipe thermistor is used to control a discharge pipe.
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.
2. A discharge pipe thermistor is used for detecting a disconnected discharge pipe thermistor.
C Gas Pipe
Thermistor
(DGN)
1. When cooling: a gas pipe thermistor is used for gas pipe isothermal control.
Control electronic expansion valve opening so that a gas pipe temperature in each room
becomes equal.
SV
D
2
Four-way valve
1
Compressor
3
Solenoid valve
EV
B
EV
C
EV
D
EV
A
Receiver
4
Expansion valve
A
B
C
D
E
(R2435)
Summary of Contents for Super Multi NX B series
Page 7: ...Si12 308 vi Table of Contents ...
Page 29: ...List of Functions Si12 308 18 List of Functions ...
Page 71: ...Specifications Si12 308 60 Specifications ...
Page 175: ...Instruction Si12 308 164 System Configuration ...
Page 227: ...Check Si12 308 216 Service Diagnosis ...
Page 288: ...Si12 308 Wiring Diagrams Appendix 277 FTXD50BVMC FTXD60 71BVMC ...
Page 299: ...Si12 308 iv Index ...