Mitsubishi Electric PUHZ-W85VAA Service Manual page 59

OPERATING PROCEDURE
9. Removing the thermistor <Discharge> (TH4) and thermis-
tor <Comp. Surface> (TH33)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the cover panel (front). (See Photo 3-1)
(4) Remove the comp case (top). (See Photo 3-2)
(5) Remove the comp case (front). (See Photo 3-2)
(6) Disconnect the connectors TH4 (WH) and TH33(YE) on the con-
troller circuit board in the electrical parts box. (See Photo 3-1)
(7) Loosen the fasteners, wire clip and cable straps for the
lead wires in the electrical parts box.
(8) Loosen the bands for the lead wires.
(9) Loosen the clamps for the lead wire in the separator.
(10) Pull out the thermistor <Discharge> (TH4) from thermistor holder.
(11) Pull out the thermistor <Comp. Surface> (TH33) from
thermistor holder, then remove the terminal cover fixing
screw of nut (1 for front/ M5).
10. Removing the thermistor <Inlet Water> (TH34)
(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 side panel (R). (See Photo 1)
(6) Disconnect the connector TH34 (RD) on the controller
circuit board in the electrical parts box. (See Photo 3-1)
(7) Loosen the clamps, fasteners, wire clips and cable straps
for the lead wires in the electrical parts box.
(8) Loosen the bands for the lead wires.
(9) Loosen the lead wires fixed to the pipes with bands.
(10) Remove the thermistor <Inlet Water> (TH34) from the
plate heat exchanger.
Note 1: Recover water in the plate heat exchanger before
removing the water piping.
Note 2: When replacing a thermistor, put a tape around
the screws not to leak water.
OCH681
PHOTOS/FIGURES
Photo 9
Thermistor <Comp.
Surface> (TH33)
Photo 10
59
Thermistor
<Discharge> (TH4)
Thermistor
<Inlet water> (TH34)