Disassembly Procedure - Mitsubishi Electric PUMY-P36NKMU3 Technical & Service Manual

11

DISASSEMBLY PROCEDURE

PUMY-P36NKMU3
: Indicates the visible parts in the photos/figures.
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 (2 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 4 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)
(5) Disconnect the connectors, CNF1 and CNF2 on multi
controller circuit board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 20) to detach the
fan motor. (See Photo 3)
Note: Tighten the propeller fan with a torque of 5.7 ± 0.3
N·m [4.2 ± 0.2 ft = lbs]
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 connecting wire from terminal block.
(4) Remove all the following connectors from multi controller
circuit board;
<Diagram symbol in the connector housing>
• Fan motor (CNF1, CNF2)
• Thermistor <HIC pipe> (TH2)
• Thermistor <Outdoor liquid pipe> (TH3)
• Thermistor <Compressor> (TH4)
• Thermistor <Suction pipe/Ambient, Outdoor> (TH7/6)
• High pressure switch (63H)
• High pressure sensor (63HS)
• Low pressure sensor (63LS)
• 4-way valve (21S4)
• Bypass valve (SV1)
• Linear expansion valve (LEV-A, LEV-B)
Pull out the disconnected wire from the electrical parts box.
(5) Remove the terminal cover and disconnect the compres-
sor lead wire from the comp. terminal. (See Figure 1)
Note: The terminal cover can be easily removed by using
a blade of flathead screwdriver.
Figure 1
Terminal cover
OCH733
PUMY-P48NKMU3
Comp. terminal
137
PUMY-P36NKMU3-BS
Note: Turn OFF the power supply before disassembly.
PHOTOS/FIGURES
Top panel fixing screws
Photo 1
Top panel
Grille fixing
screws
Grille fixing
screws
Photo 2
Propeller Front panel
Nut
Photo 4
Front panel fixing
screws (5x12)
Front panel
fixing
screws
(4x10)
Front panel fixing
screws (5x12)
PUMY-P48NKMU3-BS
Service panel
fixing screw
Slide
Service
panel
Fan grille
Service panel
fixing screws
Photo 3
Fan motor fixing screws
Fan motor
Electrical
parts box
Multi controller
board
(MULTI.B)
Terminal block
(TB3) (TB7)
Side panel
(R)
Terminal block
(TB1)
Valve bed
fixing screws
Valve bed
Compressor
(MC)
Terminal cover
Cover panel
(Rear)
Cover panel
(Front)
Cover panel
fixing screws
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