EngA DJM3

A DJM3
IOM-17 13 of 27 Mar 99 R3
Itispossibletoobtainanextendedtemperaturerangebyplacinga120‐ohmresistorinserieswiththe
ambienttemperaturesensor.
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Note: Withthisresistorthedischargetemperaturewillbeatitsmaximumwhenambientisat‐15°F.
Withthisresistor,thecalculateddischargeairset‐pointequalsthedialset‐pointat35°F
(differentfromabove).Above40°Fthecalculateddischargeairtemperaturewillbebelowthe
dialset‐point.
TABLE11
ResetRatioPot
Setting
ResetAmount°F
(noresistor)
ResetAmount°F
(witha120ohmresistorinseries)
1 10 18
2 11 20
3 13 24
4 16 30
5 21 37
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MAKE/BREAKRESETandOVERRIDE
“OR”and“V”Override
(DayOperationonly)
ToactivatethisfeatureDIPswitch3mustbeoff.Ifathermostatorcontactisclosedacrossterminals
“OR”and“V”,thedischargetemperatureissetat120°F(49°C).Whenthermostatorcontactisopen,
thedischargetemperatureissetatthedialsetpointplusanyotherresetsbeingused.
“X”and“Z”Override(DayandNightOperation)
ToactivatethisfeatureDIPswitch3mustbeon.Duringdayoperation,ifathermostatorcontactis
closedacrossterminals“X”and“Z”,thedischargetemperatureissetatthedialsetpointplusthe
maximumamountofresetupwards.Whenthethermostatorcontactisopenacrossterminals“X”and
“Z”,thedischargetemperatureissetatthedialsetpointlessthemaximumamountofreset
downwards.
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DuringNightoperation,ifathermostatorcontactisclosedacrossterminals“X”and“Z”,thedischarge
temperatureissetat120°F(49°C).Whenthethermostatorcontactisopenacrossterminals“X”and
“Z”,heatisoff.
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