Mitsubishi Electric MXZ-4C36NAHZ Service Manual page 142

OPERATING PROCEDURE
9. Removing bypass valve coil (SV1) and bypass valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the cover panel (front). (Refer to procedure 8 (5))
(4) Remove the cover panel (rear). (Refer to procedure 8 (6))
(5) Remove the side panel (R). (Refer to procedure 8 (7))
(6) Remove the bypass valve coil fixing screw (M4 × 6).
(7) Remove the bypass valve coil by sliding the coil upward.
(8) Disconnect the connector SV1 (gray) on the multi controller
circuit board in the electrical parts box.
(9) Remove the electrical parts box. (See Photo 4)
(10) Recover refrigerant.
(11) Remove the welded part of bypass valve.
Refer to the notes below.
10. Removing the high pressure switch (63H) and high pres-
sure sensor (63HS)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the cover panel (front). (Refer to procedure 8 (5))
(4) Remove the cover panel (rear). (Refer to procedure 8 (6))
(5) Remove the side panel (R). (Refer to procedure 8 (7))
(6) Pull out the lead wire of high pressure switch and high pres-
sure sensor.
(7) Remove the electrical parts box. (See Photo 4)
(8) Recover refrigerant.
(9) Remove the welded part of high pressure switch and high
pressure sensor.
Refer to the notes below.
11. Removing the low pressure sensor (63LS)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the cover panel (front). (Refer to procedure 8 (5))
(4) Remove the cover panel (rear). (Refer to procedure 8 (6))
(5) Remove the side panel (R). (Refer to procedure 8 (7))
(6) Disconnect the connector 63LS (blue) on the multi controller
circuit board in the electrical parts box.
(7) Remove the electrical parts box. (See Photo 4)
(8) Recover refrigerant.
(9) Remove the welded part of low pressure sensor.
Refer to the notes below.
12. Removing electrical expansion valve (LEV-A, LEV-B)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the cover panel (front). (Refer to procedure 8 (5))
(4) Remove the cover panel (rear). (Refer to procedure 8 (6))
(5) Remove the side panel (R). (Refer to procedure 8 (7))
(6) Remove the electrical expansion valve coil. (See Photo 10,11)
(7) Remove the electrical parts box. (See Photo 4)
(8) Recover refrigerant.
(9) Remove the welded part of electrical expansion valve.
Refer to the notes on the right.
OCH573
PHOTOS
Photo 10
Electronic expansion
Bypass valve
valve coil (LEV-B)
coil fixing screw
High pressure
switch (63H)
Photo 11
Electronic expansion
Low pressure
valve coil (LEV-A)
sensor (63LS)
Notes:
1. Recover refrigerant without spreading it in the air.
2. The welded part can be removed easily by removing
the side panel (R).
3. When installing the following parts, cover it with a
wet cloth to prevent it from heating as the tempera-
ture below, then braze the pipes so that the inside of
pipes are not oxidized;
• Bypass valve (procedure 9), 248-F [120°C] or more
• High pressure switch and high pressure sensor
(procedure 10), 212-F [100°C] or more
• Low pressure sensor (procedure 11), 212-F [100°C]
or more
• LEV (procedure 12), 248-F [120°C] or more
142
Bypass valve
coil (SV1)
Electronic
expansion
valve
Bypass valve
Low pressure
sensor (63LS)
High pressure
sensor (63HS)
Electronic
expansion valve