Carrier Air Conditioner Alarm and Alert Codes cont, T112, T113, T114, T115, T116, T117, T118

Table 29 — Alarm and Alert Codes (cont)

ALARM/	ALARM		WHY WAS THIS	ACTION TAKEN	RESET	PROBABLE
ALERT	OR	DESCRIPTION	ALARM
				BY CONTROL	METHOD	CAUSE
CODE	ALERT		GENERATED?
T112	Alert	Circuit A High Suction	If EXV is greater than	Circuit A shutdown after	Manual	Faulty expansion
		Superheat	98%, suction superheat is	pumpdown complete.		valve or EXV board,
			greater than 75 F (41.7 C)			low refrigerant
			and saturated suction			charge, plugged fil-
			temperature is less than			ter drier, faulty suc-
			MOP for 5 minutes			tion gas thermistor
						(T7) or cooler ther-
						mistor (T5).
T113	Alert	Circuit B High Suction	If EXV is greater than	Circuit B shutdown after	Manual	Faulty expansion
		Superheat	98% suction superheat is	pumpdown complete.		valve or EXV board,
			greater than 75 F (41.7 C)			low refrigerant
			and saturated suction			charge, plugged fil-
			temperature is less than			ter drier, faulty suc-
			MOP for 5 minutes			tion gas thermistor
						(T8) or cooler ther-
						mistor (T6).
T114	Alert	Circuit A Low Suction	If EXV is greater than	Circuit A shutdown after	Automatic restart	Faulty expansion
		Superheat	10%, and either suction	pumpdown complete.	after first daily	valve or EXV board,
			superheat is less than		occurrence.	faulty suction gas
			superheat set point –10 F		Manual restart	thermistor (T7) or
			(5.6 C) or saturated		thereafter.	cooler thermistor
			suction temperature is			(T5).
			greater than MOP for
			5 minutes
T115	Alert	Circuit B Low Suction	If EXV is greater than	Circuit B shutdown after	Automatic restart	Faulty expansion
		Superheat	10%, and either suction	pumpdown complete.	after first daily	valve or EXV board,
			superheat is less than		occurrence.	faulty suction gas
			superheat set point –10 F		Manual restart	thermistor (T8) or
			(5.6 C) or saturated		thereafter.	cooler thermistor
			suction temperature is			(T6).
			greater than MOP for
			5 minutes
T116	Alert	Circuit A Low Cooler	1. If the saturated suction	1. Mode 7 initiated. No addi-	1. Automatic reset	Faulty expansion
		Suction Temperature	temperature is 24 to	tional capacity increases.	if corrected.	valve or EXV board,
			29° F (13.3 to 16.1° C)	Alert not tripped.		low refrigerant
			below cooler LWT and			charge, plugged fil-
			is also 2° F (1.1° C)			ter drier, faulty suc-
			less than freeze*			tion gas thermistor
			2. If the saturated suction	2. Circuit shutdown without	2. Manual	(T7) or cooler ther-
			temperature is 30° F	going through pumpdown.		mistor (T5), low
			(16.7° C) below cooler			cooler fluid flow.
			LWT and is also 2° F
			(1.1° C) less than
			freeze* for 10 minutes
T117	Alert	Circuit B Low Cooler	1. If the saturated suction	1. Mode 8 initiated. No addi-	1. Automatic reset	Faulty expansion
		Suction Temperature	temperature is 24 to	tional capacity increases.	if corrected.	valve or EXV board,
			29°F (13.3 to 16.1° C)	Alert not tripped.		low refrigerant
			below cooler LWT and			charge, plugged fil-
			is also 2°F (1.1° C)			ter drier, faulty suc-
			less than freeze*			tion gas thermistor
			2. If the saturated suction	2. Circuit shutdown without	2. Manual	(T8) or cooler ther-
			temperature is 30° F	going through pumpdown.		mistor (T6), low
			(16.7° C) below cooler			cooler fluid flow.
			LWT and is also 2° F
			(1.1° C) less than
			freeze* for 10 minutes
T118	Alert	Circuit A Low Oil	Oil pressure switch open	Circuit shutdown without	Manual	Oil pump failure, low
		Pressure	after 1 minute of continu-	going through pumpdown.		oil level, switch fail-
			ous operation			ure or compressor
						circuit breaker
						tripped.
T119	Alert	Circuit B Low Oil	Oil pressure switch open	Circuit shutdown without	Manual	Oil pump failure, low
		Pressure	after 1 minute of continu-	going through pumpdown.		oil level, switch fail-
			ous operation			ure or compressor
						circuit breaker
						tripped.

	LEGEND
CCN	— Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB	— Compressor Expansion Board
EMM	— Energy Management Module
EWT	— Entering Fluid Temperature
EXV	— Electronic Expansion Valve
FSM	— Flotronic™ System Manager
LCW	— Leaving Chilled Water
LWT	— Leaving Fluid Temperature
MBB	— Main Base Board
MOP	— Maximum Operating Pressure
WSM	— Water System Manager

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze is CSP.1 –8° F (4.4 C) for single set point and lower of CSP.1 or CSP.2 –8° F (4.4 C) for dual set point configuration.

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