Mitsubishi PUZ-A18NHA6 - Emergency Operation Guide; Emergency Operation Procedure; Releasing Emergency Operation

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10-8. EMERGENCY OPERATION
(1)Whenthecheckcodesshownbelowaredisplayedonoutdoorunitormicroprocessorforwiredremotecontrollerorindoor
unithasafailure,butnootherproblemsarefound,emergencyoperationwillbeavailablebysettingtheemergencyopera-
tionswitch(SWE)toONandshort-circuitingtheconnector(CN31)onoutdoorcontrollerboard.
(2) Check the following items and cautions for emergency operation
1Makesurethatthereisnoabnormalityinoutdoorunitotherthantheaboveabnormalities.(Emergencyoperationwillnot
beavailablewhencheckcodesotherthantheaboveareindicated.)
2Foremergencyoperation,itisnecessarytosettheemergencyoperationswitch(SWE)onindoorcontrollerboard.Refer
totheelectricalwiringdiagramofindoorunitforhowtosettheindoorunit.)
3Duringemergencyoperation,theair-conditionerwillcontinuouslybeoperatedbysupplyingpowerandstoppingit:Itcan-
notbeturnedonoroffbyremotecontrol,andtemperaturecontrolisnotpossible.
4Donotperformemergencyheatingoperationforanextendedperiodoftime:Iftheoutdoorunitstartsdefrostingduring
thisperiod,coldairwillblowoutfromtheindoorunit.
5Donotperformemergencycoolingoperationformorethan10hours:Neglectingthiscouldresultinfreezingtheheat
exchangerinindoorunit.
(3) Emergency operation procedure
1Turnthemainpowersupplyoff.
2Turnontheemergencyoperationswitch(SWE)onindoorcontrollerboard.
3Settheshortingpinsofemergencyoperationconnector(CN31)onoutdoorcontrollerboardtoON.
4UseSW4-2onoutdoorcontrollerboardtosettheoperationmode(coolingorheating).(SW4-1isnotused.)

5Turningthemainpowersupplyonwillstarttheemergencyoperation.
SW4
1 2 Cooling
Heating
ON
ON
OFF
CN31
Shorting pins
(4) Releasing emergency operation
1Turnthemainpowersupplyoff.
2Settheemergencyoperationswitch(SWE)onindoorcontrollerboardtoOFF.
3Settheshortingpinsofemergencyoperationconnector(CN31)onoutdoorcontroller
boardtoOFF.
4SetSW4-2onoutdoorcontrollerboardasshownintheright.
Note:Ifshortingpinsarenotsetonemergencyoperationconnector(CN31),thesettingremainsOFF.
SW4
1 2 Cooling
Heating
(PUZ only)
ON
Inspected content
Open/short of pipe thermistor (TH3/TH6)
Indoor/outdoor unit communication error •Signal receiving error (Outdoor unit)
Indoor/outdoor unit communication error •Transmitting error (Indoor unit)
Communication error other than outdoor unit
Communication error between outdoor controller board and M-NET board (Serial communication error)
Check code
U4
E8
E9
E0–7
Ed
When following abnormalities occur, emergency operation will be available.
OCH577A