Operating Procedure - Mitsubishi Electric PUHZ-W50VHA Service Manual

OPERATING PROCEDURE

4. Removing the thermistor <Plate HEX Liquid> (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.
(4) Loosen the clamps for the lead wire.
(5) Pull out the thermistor <Plate HEX Liquid> (TH6) from
the sensor holder.
Note: In case of replacing thermistor <Plate
HEX Liquid>(TH6), replace it together with
thermistor<Ambient> (TH7), since they are com-
bined together.
Refer to 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.
(4) Loosen the clamps for the lead wire.
(5) Pull out the thermistor <Ambient> (TH7) from the sensor
holder.
Note: In case of replacing thermistor <Ambient>(TH7),
replace it together with thermistor <Plate HEX
Liquid> (TH6), since they are combined together.
Refer to No.4 above to remove thermistor <Plate
HEX Liquid>.
6. Removing the thermistor <Liquid> (TH3) and thermistor
<Discharge> (TH4), thermistor <Comp. surface> (TH33)
(1) Remove the service panel. (See Photo 1)
(2) Disconnect the connectors, TH3 (white), TH4 (white), and
TH33 (yellow) on the controller circuit board.
(3) Loosen the clamps for the lead wire.
(4) Pull out the thermistor <Liquid> (TH3) (See Photo 5) and
thermistor <Discharge> (TH4) from the sensor holder.
[Removing the thermistor <Comp. surface> (TH33)]
Except W85VHA(-BS)
(5) Pull out the thermistor <Comp. surface> (TH33) from
the holder of the compressor shell.
7. Removing the thermistor <Inlet Water> (TH32)
(1) Remove the service panel. (See Photo 1)
(2) Remove 2 screws (5 × 12) and remove the front cover
panel.
(3) Remove 2 screws (5 × 12) and remove the back cover
panel.(W85)/ Remove 3 stay fixing screws (4 × 10) and
remove the stay. Remove 3 right side panel fixing screws
(5 × 12) and remove the right side panel. (W50)
(4) Disconnect the connectors, TH32 (black) on the control-
ler circuit board.
(5) Loosen the clamp for the lead wire.
(6) Remove the thermistor <Inlet water> (TH32) from the
plate heat exchanger.
Note: Before removing the thermistor<Inlet water> (TH32),
recover water in the plate heat exchanger.
OCH439M
PHOTOS/FIGURES
Photo 5
Thermistor
<Plate HEX liquid>
(TH6)
Receiver
Photo 6
Sensor holder for thermistor <Ambient> (TH7) Sensor holder for thermistor <Ambient> (TH7)
Photo 7
Thermistor
<Discharge> <Discharge>
(TH4)
Photo 8
Thermistor
<Inlet water>
(TH32)
104
Thermistor Thermistor
<Liquid>(TH3)
Plate heat
exchanger
Plate heat exchanger
fi xing screw
Plate heat Plate heat
exchanger exchanger