Mitsubishi Electric Mr Slim PUHZ-RP50VHA4 Service Manual page 137

OPERATING PROCEDURE
4. 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 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.
(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.5 below to remove thermistor
<Ambient>.
5. 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.4 above to remove thermistor
<Outdoor 2-phase pipe>.
6. 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) Disconnect the lead wires from the wire clip on the outdoor
controller board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 5)
(5) Pull out the thermistor <Liquid> (TH3), thermistor <Ref,
check> (TH33) and thermistor <Discharge> (TH4) from the
sensor holder.
[Removing the thermistor<Comp. surface> (TH32)]
(6) Remove the compressor cover (upper) and pull out the
thermistor <Comp. surface> (TH32) from the holder of the
compressor surface. (TH3, TH32, TH33 : See Figure 1)
OCH451D
Photo 5
Electrical parts box
Controller
circuit board
(C.B.)
Photo 6
Lead wire of thermistor <Ambient> (TH7)
Photo 7
137
PHOTOS
Thermistor
<Outdoor 2-phase pipe>
(TH6)
Sensor holder
Compressor
cover (upper)
Dischage
thermistor
(TH4)
Clamp