Carrier 19XL specifications Chiller Protect Limit Faults, Protective Limit

Table 9 Ð LID Primary and Secondary Messages and Custom Alarm/Alert Messages

with Troubleshooting Guides (cont)

K. CHILLER PROTECT LIMIT FAULTS

Excessive numbers of the same fault can lead to severe chiller damage. Seek service expertise.

PRIMARY MESSAGE	SECONDARY MESSAGE	ALARM MESSAGE/PRIMARY CAUSE							ADDITIONAL CAUSE/REMEDY
									Check discharge temperature immediately. Check sen-
PROTECTIVE LIMIT	HIGH DISCHARGE	CMPD [VALUE] exceeded limit of							sor for accuracy; check for proper condenser ¯ow and
									temperature; check oil reservoir temperature. Check
	TEMP	[LIMIT]*. Check discharge temperature.
									condenser for fouled tubes or air in chiller. Check for
									proper guide vane actuator operation.
PROTECTIVE LIMIT	LOW REFRIGERANT	ERT [VALUE] exceeded limit of [LIMIT]*.							Check for proper amount of refrigerant charge; check
									for proper water ¯ow and temperatures. Check for
	TEMP	Check evap pump and ¯ow switch.
									proper guide vane actuator operation.
									Check motor temperature immediately. Check sensor
PROTECTIVE LIMIT	HIGH MOTOR	MTRW [VALUE] exceeded limit of							for accuracy. Check for proper condenser ¯ow and
		[LIMIT]*. Check motor cooling and							temperature. Check motor cooling system for restric-
	TEMPERATURE
		solenoid.							tions. Check motor cooling solenoid for proper opera-
									tion. Check refrigerant ®lter.
									Check for throttled oil supply isolation valves. Valves
PROTECTIVE LIMIT	HIGH BEARING	MTRB [VALUE] exceeded limit of							should be wide open. Check oil cooler thermal expan-
									sion valve. Check sensor accuracy. Check journal and
	TEMPERATURE	[LIMIT]*. Check oil cooling control.
									thrust bearings. Check refrigerant ®lter. Check for ex-
									cessive oil sump level.
									Check power to oil pump and oil level. Check for dirty
		OILPD [VALUE] exceeded limit of							®lters or oil foaming at start-up. Check for thermal
									overload cutout. Reduce ramp load rate if foaming
		[LIMIT]*. Check oil pump and
									noted.
		transducer.
PROTECTIVE LIMIT	LOW OIL PRESSURE								NOTE: This alarm is not related to pressure switch
									problems.
		Low Oil Pressure [OPEN]*. Check oil							Check the oil pressure switch for proper operation.
									Check oil pump for proper pressure. Check for exces-
		pressure switch/pump and 2C aux.
									sive refrigerant in oil system.
PROTECTIVE LIMIT	NO MOTOR CURRENT	CA		P Loss of Motor Current: Check					Check wiring: Check torque setting on solid-state
									starter. Check for main circuit breaker trip. Check
		sensor.
									power supply to PSIO module.
PROTECTIVE LIMIT	POWER LOSS	V	P Power Loss: Check voltage
		supply.							Check 24-vdc input sensor on the SMM; adjust potenti-
PROTECTIVE LIMIT	LOW LINE VOLTAGE	V	P [VALUE] exceeded limit of						ometer if necessary. Check transformers to SMM.
		[LIMIT]*. Check voltage supply.							Check power to PSIO module. Check distribution bus.
									Consult power company.
PROTECTIVE LIMIT	HIGH LINE VOLTAGE	V	P [VALUE] exceeded limit of
		[LIMIT]*. Check voltage supply.
PROTECTIVE LIMIT	LOW CHILLED	EVFL Flow Fault: Check evap pump/¯ow
	WATER FLOW	switch.							Perform pumps Control Test and verify proper switch
PROTECTIVE LIMIT	LOW CONDENSER	CDFL Flow Fault: Check cond pump/							operation. Check all water valves and pump operation.
	WATER FLOW	¯ow switch.
									Check the high-pressure switch. Check for proper con-
		High Cond Pressure [OPEN]*. Check							denser pressures and condenser water¯ow. Check for
		switch, oil pressure contact, and water							fouled tubes. Check the 2C aux. contact and the oil
PROTECTIVE LIMIT	HIGH CONDENSER	temp/¯ow.							pressure switch in the power panel. This alarm is not
	PRESSURE								caused by the transducer.
		High Cond Pressure [VALUE]: Check							Check water ¯ow in condenser. Check for fouled
									tubes. Transducer should be checked for accuracy.
		switch, water ¯ow, and transducer.
									This alarm is not caused by the high pressure switch.
PROTECTIVE LIMIT	1CR AUX CONTACT	1CR			AUX Starter Contact Fault: Check				1CR auxiliary contact opened while chiller was run-
	FAULT	1CR/1M aux contacts.							ning. Check starter for proper operation.
PROTECTIVE LIMIT	RUN AUX CONTACT	RUN					AUX Starter Contact Fault Check		Run auxiliary contact opened while chiller was running.
	FAULT	1CR/1M aux contacts.							Check starter for proper operation.
PROTECTIVE LIMIT	CCN OVERRIDE STOP	CHIL					S	S CCN Override Stop while	CCN has signaled chiller to stop. Reset and restart
									when ready. If the signal was sent by the LID, release
		in LOCAL run mode.
									the Stop signal on STATUS01 table.
PROTECTIVE LIMIT	SPARE SAFETY	SRP				PL Spare Safety Fault: Check			Spare safety input has tripped or factory-installed
	DEVICE	contacts.							jumper not present.
PROTECTIVE LIMIT	EXCESSIVE MOTOR	CA		P [VALUE] exceeded limit of					Check motor current for proper calibration. Check
		[LIMIT]*. High Amps; Check guide vane
	AMPS								guide vane drive and actuator for proper operation.
		drive.
PROTECTIVE LIMIT	EXCESSIVE COMPR	Compressor Surge: Check condenser							Check condenser ¯ow and temperatures. Check con-
	SURGE	water temp and ¯ow.							®guration of surge protection.
PROTECTIVE LIMIT	STARTER FAULT	STR			FLT Starter Fault: Check starter				Check starter for possible ground fault, reverse rota-
		for fault source.							tion, voltage trip, etc.
PROTECTIVE LIMIT	STARTER OVERLOAD	STR			FLT Starter Overload Trip: Check				Reset overloads and reset alarm. Check motor current
									calibration or overload calibration (do not ®eld-calibrate
	TRIP	amps calibration/reset overload.
									overloads).
PROTECTIVE LIMIT	TRANSDUCER	V	REF [VALUE] exceeded limit of						Check transformer power (5 vdc) supply to trans-
		[LIMIT]*. Check transducer power
	VOLTAGE FAULT								ducers. Power must be 4.5 to 5.5 vdc.
		supply.

*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point prede®ned or selected by the operator as an override, alert, or alarm condition. [VALUE] is the actual temperature, pressure, voltage, etc., at which the control tripped. [OPEN] indicates that an input circuit is open.

NOTE: See Legend on page 68.

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