Mitsubishi Electric PUZ-A12NKA7 Service Manual page 110

OPERATING PROCEDURE
4. Removing the thermistor <Liquid> (TH3) and thermistor
<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) and TH3 (white)
on the controller circuit board in the electrical parts box.
(4) Loosen the 2 clamps for the lead wires on the top of the
electrical parts box.
(5) Pull out the thermistor <2-phase pipe> (TH6) and the
thermistor <Liquid> (TH3) from each sensor holders.
Note: When replacing thermistor <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) D isconnect the connector TH7/6 (red) on the controller
circuit board in the electrical parts box.
(4) L oosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 5)
(5) P ull out the thermistor <Ambient> (TH7) from the sensor
holder.
Note: When replacing thermistor <Ambient> (TH7),
replace it together with thermistor <2-phase
pipe> (TH6), since they are combined together.
Refer to procedure No.4 above to remove
thermistor <2-phase pipe>.
6. Removing the thermistor <Discharge> (TH4) and
thermistor <Comp. surface> (TH33)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors, TH4 (white) and TH33
(yellow), on the controller circuit board in the electrical
parts box.
(3) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 5)
(4) Pull out the thermistor <Discharge> (TH4) from the
sensor holder.
[Removing the thermistor<Comp. surface> (TH33)]
(5) R emove the compressor cover (upper) and pull out the
thermistor <Comp. surface> (TH33) from the holder of
the compressor shell.
7. Removing the thermistor <Suction> (TH32)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors 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 electrical parts
box. (See Photo 8)
(5) Pull out the thermistor <Suction> (TH32) from the
sensor holder.
OCH636A
PHOTOS
Photo 5
Electrical parts box
Controller
circuit board
(C.B.)
Clamp
Photo 6
Lead wire of thermistor <Ambient> (TH7)
Photo 7
110
Thermistor
<2-phase pipe>
(TH6)
Thermistor
<Ambient>
(TH7)
Thermistor
<Liquid>
(TH3)
Sensor holder
Thermistor <Dischage>
(TH4)
Thermistor
<Suction>
(TH32)
Thermistor
<Comp.Surface>
(TH33)