Mitsubishi PUZ-A18NHA6 - Emergency Operation Data

69
(5) Operation data during emergency operation
Duringemergencyoperation,nocommunicationisperformedwiththeindoorunit,sothedataitemsneededforoperation
aresettothefollowingvalues:
Operation data
Operation mode
Remarks
COOL HEAT
Intake temperature (TH1) 81°F[27:] 69°F[20.5:]
Indoor uid pipe temperature (TH2) 41°F[5:] 113°F[45:]
Indoor 2-phase pipe temperature (TH5) 41°F[5:] 122°F[50:]
Set temperature 77°F[25:] 72°F[22:]
Outdoor liquid pipe temperature (TH3) 113°F[45:] 41°F[5:] (*1)
Outdoor 2-phase pipe temperature (TH6) 122°F[50:] 41°F[5:] (*1)
Outdoor air temperature (TH7) 95°F[35:] 45°F[7:] (*1)
Outdoor suction (TH33) 41°F[5:] 41°F[5:] (*2)
Temperature difference code
(intake temperature−set temperature) (∆Tj)
5 5
Discharge super heat (SHd) 54°F[30:] 54°F[30:] (*2)
Sub-cool (SC) 9°F[5:] 9°F[5:] (*2)
*1Ifthethermistortemperaturedataisnormal(notopen/short),thatdataisloadedintothecontrolasvaliddata.
WhentheunitentersemergencyoperationandTHvaluesaremismatched,setthethermistorstoopen/short.
Andtheunitrunsemergencyoperationwiththevalueslistedabove.
*2Ifonethermistorissettoopen/short,thevaluesofSHd/SCwillbedifferentfromthelistabove.
[Example]Whenliquidtemperaturethermistor(TH3)hasanopenorshortcircuit.
Thermistor COOL HEAT
TH3 113°F[45:] 41°F[5:]
TH6
Ta Tb
Regardnormalgureaseffectivedata.
TH4
Tc Td
Regardnormalgureaseffectivedata.
TH5 41°F[5:] 122°F[50:]
TH2 41°F[5:] 113°F[45:]
TH33 Regardnormalgureaseffectivedata.
Dischargesuperheat(SHd)
Cooling=TH4−TH6=Tc−Ta
Heating=TH4−TH5=Td−122°F[50:]
Degreeofsubcooling(SC)
Cooling=TH6−TH3=Ta−113°F[45:]
Heating=TH5−TH2=50:−45:=5˚C
 or
  =122°F−113°F=9˚F
OCH577A