Mitsubishi PUZ-A18NHA6 - Page 121

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8. Removing the 4-way valve coil (21S4), linear expansion
valve coil (LEV-A) and bypass valve coil (SV)
 (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)
 [Removing the 4-way valve coil]
 (4)Remove4-wayvalvecoilfixingscrew(M4×6).
 (5)Removethe4-wayvalvecoilbyslidingthecoiltowardyou.
 (6)Disconnecttheconnector21S4(green)onthecontroller
boardintheelectricalpartsbox.
 [Removing the linear expansion valve coil]
 (4)
Removethelinearexpansionvalvecoilbyslidingthecoilupward.
 (5)Disconnecttheconnectors,LEV-A(white),onthecontroller
circuitboardintheelectricalpartsbox.
 [Removing the bypass valve coil]
 (4)Removethebypassvalvecoilfixingscrew(M4×6).
 (5)Removethebypassvalvecoilbyslidingthecoilupward.
 (6)DisconnecttheconnectorSV2(blue)onthecontroller
circuitboardintheelectricalpartsbox.
9. Removing the 4-way 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valvebedfixingscrews(4×10),4ballvalve
andstopvalvefixingscrews(5×16),thenremovethe
valvebed.
 (5)Remove3rightsidepanelfixingscrews(5×12)intherear
oftheunitandthenremovetherightsidepanel.
 (6)Removethe4-wayvalvecoil.(SeePhoto8)
 (7)Recoverrefrigerant.
 (8)Removetheweldedpartof4-way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.
Note 3: When installing the 4-way valve, cover it with a wet
cloth to prevent it from heating (250˚F or more), then
braze the pipes so that the inside of pipes are not
oxidized.
10. Removing the linear expansion 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valvebedfixingscrews(4×10),4ballvalve
andstopvalvefixingscrews(5×16),thenremovethe
valvebed.
 (5)Remove3rightsidepanelfixingscrew(5×12)intherear
oftheunitandthenremovetherightsidepanel.
 (6)Removethelinearexpansionvalve.(SeePhoto8)
 (7)Recoverrefrigerant.
 (8)Removetheweldedpartoflinearexpansion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.
Note 3: When installing the linear expansion valve, cover
it with a wet cloth to prevent it from heating (250˚F
or more), then braze the pipes so that the inside
of pipes are not oxidized.
Photo 8
Photo 9
Bypassvalve
coilfixing
screw
4-way
valve
4-wayvalvecoil
Linearexpansion
valvecoil(LEV-A)
4-wayvalve
Bypass
valve
coil(SV)
Linearexpansion
valvecoil(LEV-A)
Linearexpansion
valve
OPERATING PROCEDURE
PHOTOS
OCH577A