MXZ-SM48NAM Service Manual

160
OCH789
MXZ-SM36NAMHZ-U1 MXZ-SM42NAMHZ-U1 MXZ-SM48NAMHZ-U1
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OPERATING PROCEDURE PHOTOS/FIGURES
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 12), then
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.
Photo 1
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]
Photo 2 Photo 3
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
Photo 4
: Indicates the visible parts in the photos/gures.
Fan motor xing screws
Fan
motor
Fan motor xing screws
PropellerFront panel
Nut
Terminal cover
Comp. terminal
Top panel xing screws
Top panel
Service
panel
xing screws
Service
panel
Fan grille
Grille xing
screws
Grille xing
screws
Service panel
xing screw
Slide
Electrical
parts box
Terminal cover
Cover panel
(Front)
Valve bed
Terminal block
(TB1)
Terminal block
(TB1B)
Multi controller
circuit board
(MULTI.B)
Compressor (MC)
Front panel xing screws (5 x 12)
Front panel
xing screws (5 x 12)
Valve bed
xing screws
Cover panel
xing screws
Terminal
block
(TB3) (TB7)
Cover panel
(Rear)
Front panel xing screws (4 x 10)