Mitsubishi PUZ-A18NHA6 - Removing the Electrical Parts Box; Removing Thermistors (TH6, TH3, TH33)

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4. Removing the thermistor <2-phase pipe> (TH6), thermis-
tor <Liquid> (TH3) and thermistor <Suction> (TH33)
 (1)Removetheservicepanel.(SeePhoto1)
 (2)Removethetoppanel.(SeePhoto1)
 (3)Removethefrontpanel.(SeePhoto1)
 (4)Removetheconduitcoverandcordcover.
 (5)Removethebackpanelfixingscrews,4fromtherightand
3fromtherearside,anddetachthebackpanel.
 (SeePhoto1)
 (6)DisconnecttheconnectorTH3(white)orTH6/7(red)or
TH33(yellow)onthecontrollercircuitboardintheelectri-
calpartsbox.
 (7)Loosentheclampfortheleadwireintherearofthe
electricalpartsbox.
 (8)Pulloutthethermistor<Liquid>(TH3)andthermistor
<2-phasepipe>(TH6)andthermistor<suction>(TH33)
fromthesensorholder.
Note: Replace the thermistor <2-phase pipe> (TH6) and the
thermistor <Ambient> (TH7) together since they are
combined.
Refer to No. 5. to remove the thermistor <Ambient> (TH7).
Photo 5
Photo 6
Thermistor
<2-phasepipe>
(TH6)
Clamp
Electrical
partsbox
Thermistor
<Liquid>(TH3)
Thermistor
<Suction>
(TH33)
 3. Removing the electrical parts box
 (1)Removetheservicepanel.(SeePhoto1)
 (2)Removethetoppanel.(SeePhoto1)
 (3)Removethefrontpanel.(SeePhoto1)
 (4)Disconnecttheindoor/outdoorconnectingwirefrom
terminalblock.
 (5)Removeallthefollowingconnectorsfromcontrollercircuitboard;
 fanmotor,linearexpansionvalve,thermistor<Outdoorpipe>,
 thermistor<Shell>,thermistor<Outdoor2-phasepipe>,
 thermistor<Outdoor>,highpressureswitch,four-wayvalve
 andbypassvalve.
 
Pulloutthedisconnectedwirefromtheelectricalpartsbox.
 <Diagramsymbolintheconnectorhousing>
 •Fanmotor(CNF1)
 •Linearexpansionvalve(LEV-A)
 •Thermistor<Liquid>(TH3)
 •Thermistor<Comp.surface>(TH32)
 •Thermistor<2-phasepipe,Ambient>(TH6/7)
 •Highpressureswitch(63H)
 (6)Removetheterminalcoveranddisconnectthecompressor
leadwire.
 (7)Removetheelectricalpartsboxfixingscrews,1fromthe
front,therightandtherearside,anddetachtheelectrical
partsboxbypullingitupward.
Electricalpartsbox Controllercircuit
board(C.B.)
Electricalpartsbox
fixingscrews
Terminalblock(TB1)
OPERATING PROCEDURE PHOTOS
OCH577A