Mitsubishi Electric Mr Slim PUHZ-RP50VHA4 Service Manual page 148

OPERATING PROCEDURE
5. Removing the thermistor <Outdoor 2-phase pipe> (TH6)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connector 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) from
the sensor holder.
Note: When replacing thermistor <Outdoor 2-phase pipe>
(TH6), replace it together with thermistor <Ambient>
(TH7) since they are combined together.
Refer to procedure No.6 below to remove thermistor
<Ambient>.
6. Removing the thermistor <Ambient> (TH7)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the connector TH7/6 (red) on the controller
circuit board in the electrical parts box.
(4) Disconnect the lead wires from the wire clip on the outdoor
controller board in the electrical parts box.
(5) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 5)
(6) Pull out the thermistor <Ambient> (TH7) from the sensor
holder.
Note: When replacing thermistor <Ambient> (TH7), replace
it together with thermistor <Outdoor 2-phase pipe>
(TH6), since they are combined together.
Refer to procedure No.5 above to remove thermistor
<Outdoor 2-phase pipe>.
7. Removing the thermistor <Liquid> (TH3), thermistor
<Ref. check> (TH33), thermistor <Discharge> (TH4) and
thermistor <Comp. surface> (TH32)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors, TH3 (white) and TH4 (white),
TH33 (yellow), TH32 (black) on the controller circuit board
in the electrical parts box.
(3) Loosen the clamp for the lead wire under the electrical
parts box.
(4) Disconnect the lead wires from 4 fasteners and 2 cable
straps on the outdoor controller board in the electrical parts
box.
(5) Pull out the thermistor <Liquid> (TH3), thermistor <Ref.
check> (TH33) and thermistor <Discharge> (TH4) from the
sensor holder. (TH33: See Figure 1)
[Removing the thermistor<Comp. surface> (TH32)]
(6) Remove the sound proof cover (upper) for compressor.
(7) Pull out the thermistor <Comp. surface> (TH32) from the
holder of the compressor surface.
OCH451D
Photo 11
Electrical parts box
Clamp
Photo 12
Lead wire of thermistor <Ambient> (TH7)
Photo 13
Thermistor <Liquid> (TH3)
Compressor
Photo 14
Sound proof cover
148
PHOTOS
Thermistor
<Outdoor 2-phase pipe>(TH6)
Sensor holder
Thermistor
<Discharge>
(TH4)
Thermistor
<Comp. surface> (TH32)