Carrier 50RTG specifications Service, Control Current LED Status Alarm Relay Operations

Table 19 — C Control Current LED Status

and Alarm Relay Operations

LED STATUS			DESCRIPTION OF OPERATION	ALARM RELAY
			Normal Mode	Open
	On		Normal Mode with	Cycle
			PM Warning	(closed 5 sec.,
				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 — Test Mode — FP1/	Cycling Code 9
			FP2 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 20 — 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

Retry Mode — In Retry mode, the status LED will start to flash slowly to signal that the control is trying to recover from an input fault. The control will stage off the outputs and try to

again satisfy the thermostat used to terminal Y. Once the ther- mostat input calls are satisfied, the control will continue normal operation.

NOTE: If 3 consecutive faults occur without satisfying the thermostat input call to terminal Y, the control will go into lockout mode. The last fault causing the lockout is stored in memory and can be viewed by entering Test mode.

Aquazone™ Deluxe D Control LED Indica- tors — There are 3 LED indicators on the D Control:

STATUS LED — Status LED indicates the current status or mode of the D control. The Status LED light is green.

TEST LED — Test LED will be activated any time the D control is in test mode. The Test LED light is yellow.

FAULT LED — Fault LED light is red. The fault LED will always flash a code representing the last fault in memory. If there is no fault in memory, the fault LED will flash code 1 on and appear as 1 fast flash alternating with a 10-second pause. See Table 21.

SERVICE

Perform the procedures outlined below periodically, as indicated.

IMPORTANT: When a compressor is removed from this unit, system refrigerant circuit oil will remain in the com- pressor. To avoid leakage of compressor oil, the refrigerant lines of the compressor must be sealed after it is removed.

IMPORTANT: All refrigerant discharged from this unit must be recovered without exception. Technicians must fol- low industry accepted guidelines and all local, state and fed- eral statutes for the recovery and disposal of refrigerants.

IMPORTANT: To avoid the release of refrigerant into the atmosphere, the refrigerant circuit of this unit must only be serviced by technicians which meet local, state and federal proficiency requirements.

IMPORTANT: To prevent injury or death due to electrical shock or contact with moving parts, open unit disconnect switch before servicing unit.

Filters — Filters must be clean for maximum performance. Inspect filters every month under normal operating conditions. replace when necessary.

IMPORTANT: Units should never be operated with- out a filter.

Water Coil — Keep all air out of the water coil. Check open loop systems to be sure the well head is not allowing air to infiltrate the water line. Always keep lines airtight.

Inspect heat exchangers regularly, and clean more frequent- ly if the unit is located in a “dirty” environment. The heat exchanger should be kept full of water at all times. Open loop systems should have an inverted P trap placed in the discharge line to keep water in the heat exchanger during off cycles. Closed loop systems must have a minimum of 15 PSI during the summer and 40 PSI during the winter.

Check P trap frequently for proper operation.

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