Carrier Understanding Alarm Codes for Air Conditioners

Table 5 — ICVC Alarm Codes (cont)

CHILLER PROTECTIVE LIMIT FAULTS (cont)

ICVC FAULT	PRIMARY	SECONDARY	PRIMARY CAUSE	ADDITIONAL CAUSE/REMEDY
STATE	MESSAGE	MESSAGE
220	PROTECTIVE LIMIT	GROUND FAULT	220→Ground Fault Trip;	Check for condensation on motor terminals.
			Check Motor and Current	Check motor power leads for phase to phase or
			Sensors.	phase to ground shorts. Disconnect motor from
				VFD and megger motor.
				Call Carrier Service.
221	PROTECTIVE LIMIT	UNUSED	221→UNUSED
222	PROTECTIVE LIMIT	LINE FREQUENCY TRIP	222→Line Frequency —	If operating from a generator, check generator
			[VALUE] exceeded limit of	size and speed.
			[LIMIT]; Check Power Supply.	Check utility power supply.
223	LOSS OF	WITH VFD GATEWAY	223→Loss of SIO Comm with	Check VFD communication wiring and
	COMMUNICATION	MODULE	VFD Gateway: Check VFG	connectors on VFD Gateway and DPI board.
			Module and Power.	Check for compatibility between ICVC and
				Gateway software.
224	PROTECTIVE LIMIT	VFD COMMUNICATIONS	224→Loss of DPI Comm with	Check VFD communication wiring and
		FAULT	VFD Gateway: Check VFG to	connectors.
			VFD Comm.	Check status lights on DPI Communications
				Interface Board.
				Call Carrier Service.
225	PROTECTIVE LIMIT	MOTOR CURRENT	225→Motor Current Imbal-	Check Motor Current % Imbalance in
		IMBALANCE	ance: Check VFD Fault	VFD_CONF screen.
			History for Values.
226	PROTECTIVE LIMIT	LINE PHASE REVERSAL	226→Line Phase Reversal:	Reverse connections of any two line conductors
			Check Line Phases.	to circuit breaker.
227	PROTECTIVE LIMIT	OIL PRESS SENSOR	227→Oil Pressure Delta P	Check transducer wiring and accuracy.
		FAULT	[VALUE] (Pump Off): Check	Check power supply to pump.
			Pump/Transducers.	Check pump operation.
				Check transducer calibration.
228	PROTECTIVE LIMIT	LOW OIL PRESSURE	228→Low Operating Oil	Check transducer wiring and accuracy.
			Pressure [VALUE]: Check Oil	Check power supply to pump.
			Pump and Filter.	Check pump operation.
				Check oil level.
				Check for partially closed service valves.
				Check oil filters.
				Check for foaming oil at start-up.
				Check transducer calibration.
229	PROTECTIVE LIMIT	LOW CHILLED WATER	229→Low Chilled Water Flow;	Perform pump control test.
		FLOW	Check Switch/Delta P Config	Check optional transducer calibration and
			& Calibration.	wiring.
				Check Evaporator Refrigerant Temperature
				sensor.
				Check chilled water valves.
				Check for evaporator saturation temperature
				< 34 F if not in Pumpdown Lockout mode. Place
				unit in Pumpdown mode before removing
				charge.
230	PROTECTIVE LIMIT	LOW CONDENSER	230→Low Condenser Water	Perform pump control test.
		WATER FLOW	Flow; Check Switch/Delta P	Check optional transducer calibration and
			Config & Calibration.	wiring.
				Check condenser water valves.
				Check for COND PRESS OVERRIDE + 5 psig.
231	PROTECTIVE LIMIT	HIGH DISCHARGE TEMP	231→Comp Discharge Temp	Check for closed compressor discharge isola-
			[VALUE] Exceeded Limit of	tion valve.
			[LIMIT]*.	Check if chiller was operating in surge.
				Check sensor resistance or voltage drop.
				Check for proper wiring.
				Check for proper condenser flow and
				temperature.
				Check compressor discharge isolation valve.
				Check for proper inlet guide vane and optional
				diffuser actuator operation.
232	PROTECTIVE LIMIT	LOW REFRIGERANT	232→Evaporator Refrig Temp	Check for proper refrigerant charge.
		TEMP	[VALUE] exceeded limit of	Check float valve operation.
			[LIMIT]*.	Check for closed condenser liquid line isolation
				valve. If problem occurs at high load, check for
				low condenser pressure which causes inade-
				quate flasc orifice differential pressure.
				Check for proper water flow and temperature.
				Confirm that condenser water enters bottom row
				of condenser tubes first.
				Check Evaporator Refrigerant Temperature
				sensor.
				Check for division plate gasket bypass.
				Check for fouled tubes.

*[LIMIT] is shown on the ICVC as the temperature, pressure, voltage, etc., set point predefined or selected by the operator as an override, alert, or alarm condition. [VALUE] is the actual pressure, temperature, voltage, etc., at which the control tripped.

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