Mitsubishi Electric PUHZ-HRP71VHA Service Manual page 129

OPERATING PROCEDURE
5. Removing the thermistor <Outdoor 2-phase pipe> (TH6)
and thermistor <Ambient> (TH7)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connectors, TH7/6 (red) on the controller
circuit board in the electrical parts box.
(4) Disconnect the lead wires from 2 fasteners on the outdoor
controller board in the electrical parts box.
(5) Loosen the 2 wire clamps on top of the electrical parts box.
(6) Pull out the thermistor <Outdoor 2-phase pipe> (TH6) and
thermistor <Ambient> (TH7) from the sensor holder.
Note: When replacing thermistor <Outdoor 2-phase pipe>
(TH6) or thermistor <Ambient> (TH7), replace it
together.
Photo 10
Lead wire of
thermistor
<Ambient>
(TH7)
Sensor holder
6. Removing the thermistor <Discharge> (TH4)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connector TH4 (white) on the controller
circuit board in the electrical parts box.
(3) Disconnect the lead wires from 2 fasteners and 1 cable strap
on the outdoor controller board in the electrical parts box.
(4) Loosen the wire clamps bottom of the electrical parts box
and separator.
(5) Pull out the thermistor <Discharge> (TH4) from the sensor
holder.
7. Removing the thermistor <Liquid> (TH3), thermistor
<Suction> (TH32), thermistor <Ref. check> (TH33)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connectors, TH3 (white) and TH32 (black),
TH33 (yellow) on the controller circuit board in the
electrical parts box.
(3) Disconnect the lead wires from 4 fasteners and 2 cable
straps on the outdoor controller board in the electrical
parts box.
(4) Loosen the wire clamps bottom of the electrical parts box
and separator.
(5) Pull out the thermistor <Liquid> (TH3), thermistor
<Suction> (TH32), thermistor <Ref. check> (TH33) from
the sensor holder.
(TH33 : See Photo 15)
Photo 13
OCH425F
Photo 9
Electrical parts box
Clamp
Photo 11
Clamp
Thermistor
<Discharge>
(TH4)
Compressor
(MC)
Photo 12
Low pressure
switch(63L)
Clamp
(for TH3)
Thermistor
<Suction>
(TH32)
129
PHOTOS
Thermistor
<Outdoor 2-phase pipe>(TH6)
Separator
Muffler
Thermistor <Liquid> (TH3)
Power
receiver