Removing The Thermistor; Operating Procedure - Mitsubishi Electric PUHZ-HRP71VHA Service Manual

OPERATING PROCEDURE

4. 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 and 1 edge cover
on the outdoor controller board in the electrical parts box.
(5) Loosen the clamp for the lead wire in the rear of the electri-
cal 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 5
Lead wire of
thermistor
<Ambient>
(TH7)
Sensor holder
5. Removing the thermistor <Discharge> (TH4)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connector TH4 (white) on the controller cir-
cuit 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 clamps for the lead wire in the rear of the electri-
cal parts box and the separator. (See Photo 4)
(5) Pull out the thermistor <Discharge> (TH4) from the sensor
holder.
6. 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 electri-
cal parts box.
(3) Disconnect the lead wires from 3 fasteners and 1 cable strap
on the outdoor controller board in the electrical parts box.
(4) Loosen clamps for the lead wire in the rear of the electrical
parts box (See Photo 4) and separator (See Photo 6).
(5) Loosen clamp for the lead wire for TH3.
(6) Pull out the thermistor <Liquid> (TH3), thermistor <Suction>
(TH32), thermistor <Ref. check> (TH33) from the sensor
holder. (TH33 : See Figure 2)
Photo 8
OCH425F
Photo 4
Photo 6
Clamp
Thermistor
<Discharge>
(TH4)
Compressor
(MC)
Photo 7
Low pressure
switch (63L)
Thermistor
Clamp
<Suction>
(for TH3)
(TH32)
123
PHOTOS
Heat
exchanger
Electrical
parts box
Edge cover
Separator
Muffler
Thermistor <Liquid> (TH3)
Power
receiver
Thermistor
<Outdoor
2-phase pipe>
(TH6)
Clamp