Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 161

PUMY-HP36NKMU2
: Indicates the visible parts in the photos/figures.
OPERATING PROCEDURE
1. Removing the service panel and top panel
Remove 3 service panel fixing screws (5 × 12), then
(1)
slide the hook on the right downward to remove the
service panel.
Remove screws (2 for front, 3 for rear/5 × 12) of the
(2)
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 the multi
controller circuit board in the 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 of the following connectors from multi control-
ler 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, SV2)
• Linear expansion valve (LEV-A, LEV-B)
• Base heater (SS)
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
OCH811A
PUMY-HP42NKMU2
Comp. terminal
161
PUMY-HP48NKMU2
PHOTOS/FIGURES
Photo 1
Top panel fixing screws
Top panel
Grille fixing
screws
Grille fixing
screws
Photo 2
Front panel Propeller
Nut
Photo 4
Front panel fixing screws (5 x 12)
Front panel fixing screws (4 x 10)
Front panel
fixing screws (5 x 12)
Service panel
fixing screw
Slide
Service
panel
Fan grille
Service
panel
fixing screws
Photo 3
Fan motor fixing screws
Fan motor fixing screws
Electrical
parts box
Multi controller
circuit board
(MULTI.B)
Terminal
block
(TB3) (TB7)
Terminal block
(TB1B)
Terminal block
(TB1)
Valve bed
fixing screws
Valve bed
Compressor (MC)
Terminal cover
Cover panel
(Rear)
Cover panel
(Front)
Cover panel (Front)
fixing screws
Continue to the next page.
Fan
motor