Carrier 19XRV specifications 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244

Table 5 — ICVC Alarm Codes (cont)

CHILLER PROTECTIVE LIMIT FAULTS (cont)

ICVC FAULT	PRIMARY	SECONDARY	PRIMARY CAUSE	ADDITIONAL CAUSE/REMEDY
STATE	MESSAGE	MESSAGE
233	PROTECTIVE LIMIT	HIGH MOTOR	233→Comp Motor Winding	Check motor sensors wiring and accuracy.
		TEMPERATURE	Temp [VALUE] exceeded	Check motor cooling line and spray nozzle for
			limit of [LIMIT]*.	proper operation, or restrictions.
				Check for excessive starts within a short time
				span.
234	PROTECTIVE LIMIT	HIGH BEARING	234→Comp Thrust Brg Temp	Check oil heater for proper operation.
		TEMPERATURE	[VALUE] exceeded limit of	Check for low oil level, partially closed oil supply
			[LIMIT]*.	valves, or clogged oil filter.
				Check oil cooler refrigerant thermal expansion
				valves.
				Confirm that TXV (thermostatic expansion valve)
				bulb is secured in place and insulated.
				Check for sensor wiring and accuracy.
				This fault can result from extended operation at low
				load with low water flow to the evaporator or
				condenser.
235	PROTECTIVE LIMIT	HIGH CONDENSER	235→Condenser Pressure	Check for high condenser water temperatures, low
		PRESSURE	[VALUE] exceeded limit of	water flow, fouled tubes.
			[LIMIT]*.	Check for division plate/gasket bypass.
				Check for noncondensables.
				Check transducer wiring and accuracy.
236	PROTECTIVE LIMIT	COMPRESS SURGE/	236→Compressor Surge:	Check for high condenser water temperatures, low
		LOW SPEED	Check condenser water temp	water flow, fouled tubes.
			and flow.	Check for division plate/gasket bypass.
				Check for noncondensables.
				Check surge prevention parameters in OPTIONS
				screen. Increase VFD Increase Step in SETUP2.
				Check VFD Minimum Speed in SETUP2 screen.
237	PROTECTIVE LIMIT	SPARE SAFETY	237→Spare Safety Device.	Spare safety input has tripped or factory installed
		DEVICE		jumper is not present on Terminal Block 4 terminals
				17 and 20 in the VFD enclosure.
238	PROTECTIVE LIMIT	EXCESSIVE COMPR	238→Compressor Surge:	Check for high condenser water temperatures, low
		SURGE	Check condenser water temp	water flow, fouled tubes.
			and flow.	Check for division plate/gasket bypass.
				Check for noncondensables.
				Check surge prevention parameters in OPTIONS
				screen.
				Check cooling tower control settings and perfor-
				mance to design/selection temperatures across the
				entire operating range of the chiller.
				Check cooler approach and water flow.
239	PROTECTIVE LIMIT	TRANSDUCER	239→Transducer Voltage Ref	Check that CCM transducer voltage reference is
		VOLTAGE FAULT	[VALUE] exceeded limit of	between 4.5 v and 5.5 v.
			[LIMIT]*.	Check that pressure transducers are not shorted to
				ground. This fault is normally declared the first time
				an ICVC is powered up if it was downloaded with
				software when it was not connected to a CCM.
				Call Carrier Service.
240	PROTECTIVE LIMIT	LOW DISCHARGE	240→Check for Oil in Or	Check for oil loss or excessive refrigerant. If oil level
		SUPERHEAT	Overcharge of Refrigerant.	is low, refrigerant charge may be too low resulting in
				ineffective oil reclaim. Excessive refrigerant charge
				may cause liquid carryover into compressor.
				Check calibration of evaporator pressure and con-
				denser pressure sensors.
				Check calibration of compressor discharge temper-
				ature sensor.
241	PROTECTIVE LIMIT	RECTIFIER	241→Rectifier Overcurrent	Check for high water temperatures or changes in
		OVERCURRENT	Fault: Check VFD Status.	water flow rates.
242	LOSS OF	WITH CCM MODULE	242→Loss of Communica-	Check wiring and control power to CCM.
	COMMUNICATION		tion With CCM, Check	Confirm that all CCM SW1 switches are in the
			Comm. Connectors.	“OFF” position.
243	POTENTIAL	EVAP PRESS/TEMP	243→Evaporator Refrig	Check for proper refrigerant charge.
	FREEZE-UP	TOO LOW	Temp [VALUE] exceeded	Check float valve operation.
			limit of [LIMIT]*.	Check for proper fluid 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.
244	POTENTIAL	COND PRESS/TEMP	244→Condenser Refrig	Condenser water too cold or chiller shut down with
	FREEZE-UP	TOO LOW	Temp [VALUE] exceeded	brine below 32 F in cooler so equalization tempera-
			limit of [LIMIT]*.	ture in chiller approached 32 F.
				Check condenser pressure transducer.
				Check refrigerant charge.

*[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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