Disassembly Procedure - Mitsubishi Electric MXZ-8A140VA1 Technical & Service Manual

14

DISASSEMBLY PROCEDURE

OUTDOOR UNIT : MXZ-8A140VA/ MXZ-8A140VA
OPERATING PROCEDURE
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 10) and slide
the hook on the right downward to remove the service
panel.
(2) Remove screws (3 for front, 3 for rear/5 × 10) of the top
panel and remove it.
2. Removing the fan motor (MF1, MF2)
(1) Remove the service panel. (See Figure 1.)
(2) Remove the top panel. (See Figure 1.)
(3) Remove 5 fan grille fixing screws (5 × 10) to detach the fan
grille. (See Figure 1.)
(4) Remove a nut (for right handed screw of M6) to detach the
propeller. (See Photo 1.)
(5) Disconnect the connectors, CNF1 and CNF2 on controller
circuit board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 25) to detach the
fan motor. (See Photo 2.)
3. Removing the electrical parts box
(1) Remove the service panel. (See Figure 1.)
(2) Remove the top panel. (See Figure 1.)
(3) Disconnect the indoor/outdoor connecting wire from termi-
nal block.
(4) Remove all the following connectors from controller circuit board;
fan motor, thermistor <Outdoor pipe>, thermistor <Discharge>,
thermistor <Outdoor 2-phase pipe>, thermistor <Outdoor>,
high pressure switch, high pressure sensor, low pressure
switch, solenoid valve coil <4-way valve> and solenoid
valve coil <Hot gas bypass>, solenoid valve coil
<Returning oil bypass>.
Then remove a screw (4 × 8) from the valve bed to remove
the lead wire.
Pull out the disconnected wire from the electrical parts box.
<Diagram symbol in the connector housing>
• Fan motor (CNF1, CNF2)
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Discharge> (TH4)
• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH7/6)
• High pressure switch (63H)
• High pressure sensor (63HS)
• Low pressure switch (63L)
• Solenoid valve coil <4-way valve> (21S4)
• Solenoid valve coil <Bypass valve> (SV1)
• Solenoid valve coil (Returning oil bypass)
<Bypass valve> (SV2)
(5) Remove the terminal cover and disconnect the compressor
lead wire.
(6) Remove an electrical parts box fixing screw (4 × 10) and
detach the electrical parts box by pulling it upward. The
electrical parts box is fixed with 2 hooks on the left and 1
hook on the right.
/ MXZ-8A140VA / MXZ-8A140VA
1 2
PHOTOS & ILLUSTRATION
Top panel fixing screws
Figure 1
Grille
fixing
screws
Grille
fixing
screws
Photo 1
Front panel
Propeller
Nut
Photo 3
Controller circuit board
(C.B.)
Screw
Cover panel fixing screws
82
3
Top panel
Service panel
Slide
Fan grille
Service panel
fixing screws
Photo 2
Fan
Fan motor fixing screws
motor
Fan motor fixing screws
Electrical
parts box
Electrical parts
box fixing screw
Terminal block
(TB1)
Valve bed
Compressor
(MC)
Terminal cover
Cover panel
(Front)