Disassembly Procedure - Mitsubishi Electric MXZ-4C36NAHZ Service Manual

10

DISASSEMBLY PROCEDURE

10-1. OUTDOOR UNIT
MXZ-4C36NAHZ MXZ-5C42NAHZ
OPERATING PROCEDURE
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 (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 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)
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 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, SV2)
• Electronic 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 compressor
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
OCH573
MXZ-8C48NAHZ
Comp. terminal
133
Note: Turn OFF the power supply before disassembly.
PHOTOS & ILLUSTRATION
Top panel fixing screws
Photo 1
Grille fixing
screws
Grille fixing
screws
Photo 2
Propeller Front panel
Nut
Photo 4
Front panel fixing screws (5 x 12)
Front panel
fixing screws (5 x 12)
Continue to the next page
Top panel
Service panel
fixing screw
Service
panel
Slide
Fan grille
Service panel
fixing screws
Photo 3
Fan motor fixing screws
Fan
motor
Fan motor fixing screws
Electrical parts box
Multi controller
circuit board
(MULTI.B)
Terminal
block
(TB3) (TB7)
Terminal block
(TB1B)
Terminal block
(TB1)
Front panel
fixing screws
(4 x 10)
Valve bed
fixing screws
Side panel(R)
Valve bed
Compressor (MC)
Terminal cover
Cover panel
(Rear)
Cover panel
(Front)
Cover panel
fixing screws