York DJ150 installation manual Trip Failure Flow Chart

035-19046-002-B-0104

	Lossof	No
Trip/Failure
	LSInput

Yes

Energizeblower:

increaseincident

valueby1

No

HP	No	LP	No
Switch		SwitchOpen
1		2
Open		>5Secs
Yes		Yes

Turnof Turnof

compressor; Compressor,

initiateASCD; initiateASCD;

increaseincident increaseincident

valveby1 valueby1

Freezestat No Open?1

Yes

Turnof compressor, initiateASCD; increaseincident valueby1

Incident	LSinput	No
value>=3? No	regained?
Yes	Yes
Lockonblower;	LoadFofD
flagalarm

Incident value>=3

Yes

Lock-out compressor,flag alarm

No Incident value>=3

Yes

Lock-out compressor,flag alarm

No Incident value>=3

Yes

Lock-out

compressor,turn ofIDblower,turn ofcondenser fans,flagalarm

			Monitor
Lossof	No	Calfor		No	GV	No
					voltage		GVvoltage	No
FOSinput		Heatw/outGV
					w/outcalfor		>5min?
>5Secs?		voltage?
					heat?
Yes		Yes		FlagAlarm			Yes
Turnoffan		No
compressor&			Yes				Flagalarm,lock
		voltage>5
condenserfans;		min?					onIDblower
initiateASCD
		No
Incident		FOSinput	No	No			LossofGV
				FOSinput>15
value>=3		regained?				Yes	Voltage?
	No			minutes?
Yes		Yes		Yes			No
Lock-out							EnergizeID
compressors,turn
		Increaseincident		Flagalarm,turnon			blower,load'Fan
ofIDblower,turn
		valueby1		Xline			OfDelay'for
ofcondenser
							heating
fans,flagalarm
				Monitor

1Thecontrolboardonlymonitorstheinputwhenthecompressorrealyisenergized.

2Thelow-pressureswitchisnotmonitoredforthefirst30secondsofcompressoractivity.Thecontrolboardthenmonitorstheswitchtoensureitcloses.Iftheswitchremainsopen andadditional30seconds,thecontrolboardturnsoftheassociatedcompressorandinitiatestheASCD.Onceithasclosedduringthestartupperiod,thecontrolboardno longerhandlesthelow-pressureswitchdiferentlythanotherinputs.

FIGURE 30 - TRIP FAILURE FLOW CHART

Unitary Products Group 45