Mitsubishi Electric PUHZ-W85VAA Service Manual page 58

OPERATING PROCEDURE
6. 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 (RD) on the controller
circuit board in the electrical parts box. (See Photo 3-1)
(4) Loosen the clamps, fasteners, wire clips and cable straps
for the lead wires in the electrical parts box.
(5) Loosen the bands for the lead wires
(6) Pull out the thermistor <Plate Hex Liquid> (TH6) from thermistor
clip.
Note 1: When replacing a thermistor <Plate Hex Liquid>
(TH6), replace it together with thermistor
<Ambient> (TH7) since they are combined
together.
Refer to procedure No.7 to remove the thermistor
<Ambient> (TH7).
7. 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 (RD) on the controller
circuit board in the electrical parts box. (See Photo 3-1)
(4) Loosen the fasteners and wire clips for the lead wire in
the electrical parts box.
(5) Loosen the clamps for the lead wires on rear of electrical
parts box.
(6) Remove the sensor holder fixing screw (1 for rear/ 5 ×
12) to remove the sensor holder.
(7) Pull out the thermistor <Ambient> (TH7) from sensor
holder.
Note 1: When replacing a thermistor <Ambient> (TH7),
replace it together with thermistor <Plate Hex
Liquid> (TH6), since they are combined together.
Refer to procedure No.6 to remove the thermistor
<Plate Hex Liquid>(TH6).
8. Removing the thermistor <Liquid> (TH3)
(1) Remove the nozzle of plate heat exchanger for the water
piping. (See Photo 14)
(2) Remove the service panel. (See Photo 1)
(3) Remove the top panel. (See Photo 1)
(4) Remove the cover panel (front). (See Photo 3-1)
(5) Remove the electrical parts box fixing screws (2 for front/
5 × 12). (See Photo 3-1)
(6) Remove the sensor holder.
(7) Remove the side panel (R) fixing screws (4 for rear and
1 for right/ 5 × 12) to remove the side panel (R). (See
Photo 1)
(8) Disconnect the connector TH3 (WH) on the controller cir-
cuit board in the electrical parts box. (See Photo 3-1)
(9) Loosen the fasteners and wire clips for the lead wire in
the electrical parts box.
(10) Loosen the clamp for the lead wires on the rear of electri-
cal parts box.
(11) Pull out the thermistor <Liquid> (TH3) from thermistor clip.
Note 1: Recover water in the plate heat exchanger before
removing the water piping.
OCH681
PHOTOS/FIGURES
Photo 6
Photo 7
Thermistor <Ambient> (TH7) and sensor holder
Photo 8
58
Thermistor
<Plate hex liquid>
(TH6)
Thermistor <Liquid> (TH3)