Carrier 50RHE006-060 System Test, C Control Current LED Status, and Alarm Relay Operations

Output EH2 will be off if FP1 is greater than 7.2 C and FP2 (when shorted) is greater than 43.3 C during Heating Stage 3 mode. This condition will have a 30-second recognition time. Also, during Heating Stage 3 mode, EH1, EH2, Fan Enable, and Fan Speed will be ON if G input is not active.

EMERGENCY HEAT — In Emergency Heat mode, the Fan Enable and Fan Speed relays are turned on. The EH1 output is turned on immediately. With continuing Emergency Heat de- mand, EH2 will turn on after 5 minutes. Fan Enable and Fan Speed relays are turned off after a 60-second delay. The control reverts to Standby mode.

Output EH1, EH2, Fan Enable, and Fan Speed will be ON if the G input is not active during Emergency Heat mode.

COOLING STAGE 1 — In Cooling Stage 1 mode, the Fan Enable, compressor and RV relays are turned on immediately. If configured as stage 2 (DIP switch set to OFF) then the com- pressor and fan will not turn on until there is a stage 2 demand. The fan Enable and compressor relays are turned off immedi- ately when the Cooling Stage 1 demand is removed. The con- trol reverts to Standby mode. The RV relay remains on until there is a heating demand. If there is a master/slave or dual compressor application, all compressor relays and related func- tions will track with their associated DIP switch 2 on S1.

COOLING STAGE 2 — In Cooling Stage 2 mode, the Fan Enable, compressor and RV relays remain on. The Fan Speed relay is turned on immediately and turned off immediately once the Cooling Stage 2 demand is removed. The control re- verts to Cooling Stage 1 mode. If there is a master/slave or dual compressor application, all compressor relays and related func- tions will track with their associated DIP switch 2 on S1.

NIGHT LOW LIMIT (NLL) STAGED HEATING — In NLL staged Heating mode, the override (OVR) input becomes ac- tive and is recognized as a call for heating and the control will immediately go into a Heating Stage 1 mode. With an addition- al 30 minutes of NLL demand, the control will go into Heating Stage 2 mode. With another additional 30 minutes of NLL demand, the control will go into Heating Stage 3 mode.

SYSTEM TEST

System testing provides the ability to check the control operation. The control enters a 20-minute Test mode by momentarily shorting the test pins (see Fig. 9-12). All time delays are reduced by a factor of 15.

Test Mode — To enter Test mode on C or D controls, cycle the power 3 times within 60 seconds. The LED (light-emitting diode) will flash a code representing the last fault when enter- ing the Test mode. The alarm relay will also power on and off during Test mode. See Tables 13 and 14. To exit Test mode, short the terminals for 3 seconds or cycle the power 3 times within 60 seconds.

NOTE: Deluxe D Control has a flashing code and alarm relay cycling code that will both have the same numerical label. For example, flashing code 1 will have an alarm relay cycling code 1. Code 1 indicates the control has not faulted since the last power off to power on sequence.

Table 13 — C Control Current LED Status

and Alarm Relay Operations

LED STATUS			DESCRIPTION OF OPERATION	ALARM RELAY
			Normal Mode	Open
	On		Normal Mode with	Cycle
				(closed 5 sec.,
			PM Warning
				Open 25 sec.)
	Off		C Control is non-functional	Open
Slow Flash			Fault Retry	Open
	Fast Flash		Lockout	Closed
Slow Flash				Open
			Over/Under Voltage Shutdown	(Closed after
				15 minutes)
Flashing Code 1		Test Mode — No fault in memory		Cycling Code 1
Flashing Code 2		Test Mode — HP Fault in memory		Cycling Code 2
Flashing Code 3		Test Mode — LP Fault in memory		Cycling Code 3
Flashing Code 4		Test Mode — FP1 Fault in memory		Cycling Code 4
Flashing Code 5		Test Mode — FP2 Fault in memory		Cycling Code 5
Flashing Code 6		Test Mode — CO Fault in memory		Cycling Code 6
Flashing Code 7			Test Mode — Over/Under	Cycling Code 7
			shutdown in memory
Flashing Code 8			Test Mode — PM in memory	Cycling Code 8
Flashing Code 9			Test Mode — FP1/FP2	Cycling Code 9
			Swapped Fault in memory
	LEGEND
CO	— Condensate Overflow
FP	— Freeze Protection
HP	— High Pressure
LED — Light-Emitting Diode
LP	— Low Pressure
PM	— Performance Monitor

NOTES:

1.Slow flash is 1 flash every 2 seconds.

2.Fast flash is 2 flashes every 1 second.

3.EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by a 10-second pause. This sequence will repeat continually until the fault is cleared.

Table 14 — C Control LED Code and

Fault Descriptions

	LED	FAULT	DESCRIPTION
CODE
	1	No fault in memory	There has been no fault since
			the last power-down to power-up
			sequence
	2	High-Pressure Switch	HP Open Instantly
	3	Low-Pressure Switch	LP open for 30 continuous sec-
			onds before or during a call
			(bypassed for first 60 seconds)
	4	Freeze Protection Coax	FP1 below Temp limit for 30 con-
		— FP1	tinuous seconds (bypassed for
			first 60 seconds of operation)
	5	Freeze Protection Air Coil	FP2 below Temp limit for 30 con-
		— FP2	tinuous seconds (bypassed for
			first 60 seconds of operation)
	6	Condensate overflow	Sense overflow (grounded) for
			30 continuous seconds
	7	Over/Under Voltage	"R" power supply is <19VAC or
(Autoreset)		Shutdown	>30VAC
	8	PM Warning	Performance Monitor Warning
			has occurred.
	9	FP1 and FP2 Thermistors	FP1 temperature is higher than
		are swapped	FP2 in heating/test mode, or FP2
			temperature is higher than FP1
			in cooling/test mode.
	LEGEND
FP	— Freeze Protection
HP	— High Pressure
LED — Light-Emitting Diode
LP	— Low Pressure
PM	— Performance Monitor

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