Mitsubishi Electric PUHZ-SW50VHA Service Manual page 72

Split-type, air to water heat pump
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OPERATING PROCEDURE
5. Removing the thermistor <Ambient> (TH7)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) D isconnect the connector TH7 (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 6)
(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. to remove thermistor
<2-phase pipe>.
6. Removing the thermistor <Discharge> (TH4) and
thermistor <Comp. surface> (TH34)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) R emove the sound proof cover from the compressor.
(7) Loosen 2 fasteners which bundles the lead wires under
the electrical parts box. (See Photo 8)
[Thermistor <Discharge> (TH4)]
(8) P ull out the thermistor <Discharge> (TH4) from the sensor
holder. (See Photo 8)
[Thermistor <Comp. surface> (TH34)]
(8) P ull out the thermistor <Comp. surface> (TH34) from the
sensor holder. (See Photo 8)
7. Removing the 4-way valve coil (21S4) and LEV coil (LEV(A),
LEV(B))
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
[Removing the 4-way valve coil (21S4)]
(6) Remove 1 4-way valve coil fixing screw (M4 × 6).
(7) Remove the 4-way valve coil by sliding the coil to the right.
[Removing the LEV coil (LEV A)]
(6) Cut the band which fixes the lead wires to the rubber tube.
(7) Loosen 2 fasteners which bundles the lead wires under
the electrical parts box. (See Photo 6)
(8) Remove the aluminium tape applied on the piping.
(9) Cut the band which fixes the lead wires to the piping.
(10) Remove the LEV coil (LEV A) by sliding the coil upward.
[Removing the LEV coil (LEV B)]
(6) Loosen 2 fasteners which bundles the lead wires under
the electrical parts box. (See Photo 6)
(7) Cut the band which fixes the lead wires to the piping.
(8) Remove the LEV coil (LEV B) by sliding the coil upward.
OCH525C
PHOTOS
Photo 7
Electrical parts box
Photo 8
Thermistor
<Discharge> (TH4)
Thermistor
<Comp. surface>
(TH34)
Sound proof
cover
Photo 9
4-way valve coil
fixing screw
LEV coil
(LEV B)
LEV B
Band
72
Thermistor <Outdoor>
(TH7)
Sensor holder
Fasteners
Band
4-way
valve coil
LEV coil
(LEV A)
LEV A
Aluminium
tape

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