Service Functions; Compulsory Defrosting Mode For Service; Change In Defrost Setting; Relation Between Main Sensor And Actuator - Mitsubishi Electric MSH09TW Service Manual

10-19. Relation between main sensor and actuator

Relation between main sensor and actuator.
Sensor
Discharge temperature
thermistor
Indoor pipe temperature
thermistor
Defrost thermistor
Evaporation temperature
thermistor
Gas pipe temperature
thermistor
High pressure
switch
Fin temperature
thermistor
Capacity code
11

SERVICE FUNCTIONS

MSH09TW -
MSH09TW
MSH12TN -
MSH12TN
MSH15TN -
MSH15TN
MSH17TN -
MSH17TN

11-1. COMPULSORY DEFROSTING MODE FOR SERVICE

By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accom-
plished regardless of the defrost interval restriction. (Refer to page 96.)
Defrost thermistor RT61 must read below 27°F(MSH09TW,MSH12/15/17TN)/ 32°F(MSH09TW
). (Refer to page 73.)
U1

11-2. CHANGE IN DEFROST SETTING

<MSH09TW, MSH12/15/17TN>
<JPC> When the JPC wire of the deicer P.C. board is cut, the defrost interval time is changed.
<JPE> When the JPE wire of the deicer P.C. board is cut, the defrost temperature is changed. (Refer to page 96.)
Model
MUH09TW
MUH12TN
MUH15TN
MUH17TN
Purpose
Compressor
Protection
Defrosting
Protection
Defrosting
Control
Control
Protection
Protection
Control
MUH09TW -
MUH09TW
U1
MUH12TN -
MUH12TN
U1
MUH15TN -
MUH15TN
U1
MUH17TN -
MUH17TN
U1
MXZ30TN and MXZ30TN2 is not equipped with this function.
Jumper wire
JPC Defrost interval time changes from 40 minutes to 15minutes.
Defrost start temperature changes from 27˚F to 32˚F.
JPE
Defrost finish temperature changes from 38˚F to 50˚F.
Actuator
Outdoor 4-way
LEV
fan motor valve
MUH12TN -
U1
MUH15TN -
U1
U1
U1
Change point
72
MXZ30TN
U2
MXZ30TN2
U2
-
,MSH12/15/17TN
U1
-