Mitsubishi PUZ-A18NHA6 - Cooling

35
<Abnormalities detected while unit is operating>
Check code
Abnormal point and detection method
Judgment and action
U1
(1302)
High pressure (High-pressure switch
63H operated)
Abnormalifhigh-pressureswitch63H
worked(*)duringcompressoroperation.
*602PSIG[4.15MPa]
63H:High-pressureswitch
1Shortcycleofindoorunit
2Cloggedfilterofindoorunit
3Decreasedairflowcausedby
dirtofindoorfan
4Dirtofindoorheatexchanger
5Lockedindoorfanmotor
6Malfunctionofindoorfanmotor
7Defectiveoperationofstop
valve(Notfullopen)
8Cloggedorbrokenpipe
9Lockedoutdoorfanmotor
0Malfunctionofoutdoorfan
motor
1Shortcycleofoutdoorunit
2Dirtofoutdoorheatexchanger
3Decreasedairflowcausedby
defectiveinspectionofoutside
temperaturethermistor
 (Itdetectslowertemperature
thanactualtemperature.)
4Disconnectionorcontactfailure
ofconnector(63H)onoutdoor
controllerboard
5Disconnectionorcontactfailure
of63Hconnection
6Defectiveoutdoorcontroller
board
7Defectiveactionoflinear
expansionvalve
8Malfunctionoffandrivingcircuit
1–6Checkindoorunitandrepairthedefect.
7Checkifstopvalveisfullyopen.
8Checkpipingandrepairthedefect.
9–2Checkoutdoorunitandrepairthedefect.
3Checktheinspectedtemperatureofoutside
temperaturethermistoronLEDdisplay.
 (SW2onA-ControlServiceTool:Refer
to"10-10.FUNCTIONOFSWITCHES,
CONNECTORSANDJUMPERS".)
4–6TurnthepoweroffandcheckF5is
displayedwhenthepowerisonagain.
 WhenF5isdisplayed,referto“Judgment
andaction”forF5.
7Checklinearexpansionvalve.
 Referto"10-6.HOWTOCHECKTHE
PARTS"and"10-7.HOWTOCHECKTHE
COMPONENTS".
8Replaceoutdoorcontrollerboard.
Case
U2
(TH32:1132)
High discharge temperature
High comp. surface temperature
(1) Abnormalifdischargetemperaturether-
mistor(TH32)exceeds257˚F[125:]
or230˚F[110:]continuouslyfor5min-
utes.
 Abnormalifcondenser/evaporator
temperaturethermistor(TH5)exceeds
104˚F[40:]duringdefrostinganddis-
chargetemperaturethermistor(TH32)
exceeds230˚F[110:].
(2)Abnormalifdischargesuperheat
 (Cooling: TH32 −TH5
 Heating:TH32−TH6)increases.
 AlltheconditionsinAorBaredetected
simultaneouslyfor10minutescontinu-
ouslyafter6minutespastfromcom-
pressorstart-up(includingthethermo-
statindicationorrecoveryfromdefrost-
ing).
<ConditionA>
•Heatingmode
•Whendischargesuperheatisless
than126˚F[70:].
•WhentheTH6tempismorethanthe
valueobtainedbyTH7−9˚F[5:].
•WhenthecondensingtempofTH5is
lessthan95˚F[35:].
<ConditionB>
•Duringcomp.operation(Coolingand
Heating)
•Whendischargesuperheatisless
than144˚F[80:]incooling.
•Whendischargesuperheatisless
than162˚F[90:]inheating.
•WhencondensingtempofTH6is
morethan−40˚F[−40:](Incooling
only).
1Overheatedcompressoropera-
tioncausedbyshortageof
refrigerant
2Defectiveoperationofstop
valve
3Defectivethermistor
4Defectiveoutdoorcontroller
board
5Defectiveactionoflinear
expansionvalve
1Checkintakesuperheat.
 Checkleakageofrefrigerant.
 Chargeadditionalrefrigerant.
2Checkifstopvalveisfullyopen.
34TurnthepoweroffandcheckifU3isdis-
playedwhenthepowerisonagain.
 WhenU3isdisplayed,referto“Judgment
andaction”forU3.
5Checklinearexpansionvalve.
 Referto"10-6.HOWTOCHECKTHE
PARTS"and"10-7.HOWTOCHECKTHE
COMPONENTS".
OCH577A