Mitsubishi Electric PUHZ-SW75VHA Service Manual page 74

PUHZ-SW100YHA.UK
PUHZ-SW120YHA.UK
OPERATING PROCEDURE
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 12) and slide
the hook on the right downward to remove the service
panel.
(2) Remove screws (3 for front, 3 for rear/5 × 12) of the top
panel and remove it.
2. Removing the fan motor (MF1, MF2)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove 5 fan grille fixing screws (5 × 12) to detach the fan
grille. (See Photo 1)
(4) Remove a nut (for right handed screw of M6) to detach the
propeller. (See Photo 2-1)
(5) Disconnect the connectors, CNF1, CNF2 on controller
circuit board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 20) to detach the
fan motor. (See Photo 2-2)
3. Removing the electrical parts box
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Disconnect the indoor/outdoor connecting wire from
terminal block.
(4) Disconnect the connector CNF1, CNF2, LEV-A and LEV-B
on the controller circuit board.
<Symbols on the board>
• CNF1, CNF2 : Fan motor
• LEV-A, LEV-B : LEV
(5) Disconnect the pipe-side connections of the following parts.
• Thermistor <Liquid>(TH3)
• Thermistor <Discharge>(TH4)
• Thermistor <2-phase pipe>(TH6)
• Thermistor <Ambient>(TH7)
• Thermistor <Comp. surface> (TH34)
• High pressure switch (63H)
• High pressure sensor (63HS)
• Low pressure switch (63L)
• 4-way valve coil (21S4)
OCH533A
PUHZ-SW100YHA-BS.UK
PUHZ-SW120YHA-BS.UK
74
PHOTOS & ILLUSTRATION
Photo 1
Top panel fixing screws
Grille
fixing
screws
Grille
fixing
screws
Photo 2-1
Front panel
Propeller
Nut
Photo 3
Controller circuit
Front panel
8
Screw
board (C.B.)
9
Screw
Top panel
Service panel
fixing screws
Service panel
Fan grille
Slide
Service panel
fixing screws
Photo 2-2
Fan
Fan motor fixing screws
motor
Fan motor fixing screws
Electrical
parts box
Noise filter
circuit
board (N.F.)
Terminal
block (TB1)
Terminal
block (TB2)
Valve bed
Compressor
(MC)
Terminal
cover
Cover panel
(Front)
Cover panel fixing screws
Continued to the next page.