Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual page 80

OPERATING PROCEDURE
9. Removing the bypass valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 right side panel fixing screws (5 × 10) in the
rear of the unit and remove the right side panel.
(5) Remove the bypass valve solenoid coil. (See Photo 7)
(6) Collect the refrigerant.
(7) Remove the welded part of bypass valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
10. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 right side panel fixing screws (5 × 10) in the rear
of the unit and remove the right side panel.
(5) Pull out the lead wire of high pressure switch.
(6) Collect the refrigerant.
(7) Remove the welded part of high pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (100°C
or more), then braze the pipes so that the inside of
pipes are not oxidized.
11. Removing the low pressure switch
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the electrical box. (See Photo 3)
(4) Disconnect the lead wire of the low pressure switch.
(5) Remove the braze part of the low pressure switch.
Note : When installing the pressure switch, cover the pressure
switch with a wet cloth to prevent the pressure switch
from heating, then braze it.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
Note 3: When installing the high/low pressure switch,
cover it with a wet cloth to prevent it from heating
(100°C or more), then braze the pipes so that the
inside of pipes are not oxidized.
OC379F
PHOTOS
Photo 7
Solenoid valve coil Solenoid valve coil
<Bypass valve> <Four-way valve>
(SV) (21S4)
Photo 8
Lead wire of high
pressure switch
Photo 9
High pressure switch (63H)
80
Solenoid valve coil
<Four-way valve>
fixing screw
Four-way valve
High pressure switch (63H)
Lead wire of
low pressure
switch
Low pressure
switch (63L)