Carrier 30XW150-400 Troubleshooting, Reset manual alarms, Symptom Possible Cause Possible Remedy

Table 48 — Troubleshooting

SYMPTOM	POSSIBLE CAUSE	POSSIBLE REMEDY
Unit Does Not Run	Check for power to unit	• Check overcurrent protection device.
		• Check non-fused disconnect (if equipped).
		• Restore power to unit.
	Wrong or incorrect unit configuration	Check unit configuration.
	Active alarm	Check Alarm status. See the Alarms and Alerts section and follow
		troubleshooting instructions.
	Active operating mode	Check for Operating Modes. See the Operating Modes section and follow trouble-
		shooting instructions
Unit Operates too Long or	Low refrigerant charge	Check for leak and add refrigerant.
Continuously	Compressor or control contacts welded	Replace contactor or relay.
	Air in chilled water loop	Purge water loop.
	Non-condensables in refrigerant circuit.	Remove refrigerant and recharge.
	Inoperative EXV	• Check EXV, clean or replace.
		• Check EXV cable, replace if necessary.
		• Check EXV board for output signal.
	Load too high	Unit may be undersized for application
Circuit Does Not Run	Active alarm	Check Alarm status. See the Alarms and Alerts section and follow
		troubleshooting instructions.
	Active operating mode	Check for Operating Modes. See the Operating Modes section and follow trouble-
		shooting instructions.
Circuit Does Not Load	Active alarm	Check Alarm status. See the Alarms and Alerts section and follow
		troubleshooting instructions.
	Active operating mode	Check for Operating Modes. See the Operating Modes section and follow trouble-
		shooting instructions.
	Low saturated suction temperature	See Operating Modes 21 and 22.
	High circuit suction superheat	The circuit capacity is not allowed increase if circuit superheat is greater than 36 F
		(20 C). See Alarms 74 and 75 for potential causes.
	Low suction superheat	The circuit capacity is not allowed to increase if the circuit superheat is less than
		18° F (10° C). See Alarms 74 and 75 for potential causes.
Compressor Does Not Run	Active alarm	Check Alarm status. See the Alarms and Alerts section and follow
		troubleshooting instructions.
	Active operating mode	Check for Operating Modes. See the Operating Modes section and follow trouble-
		shooting instructions.
	Inoperative compressor contactor	• Check control wiring.
		• Check scroll protection module.
		• Check contactor operation, replace if necessary.
Chilled Water Pump is ON, but	Cooler freeze protection	Chilled water loop temperature too low. Check cooler heater.
the Machine is OFF

LEGEND

EXV — Electronic Expansion Valve

Alarms and Alerts — The integral control system con- stantly monitors the unit and generates warnings when abnor-

Alarm

mal or fault conditions occur. Alarms may cause either a circuit (Alert) or the whole machine (Alarm) to shut down. Alarms and Alerts are assigned codes as described in Fig. 52. The alarm/alert indicator LED on the Navigator™ module is illuminated when any alarm or alert condition is present. If an Alert is active, the Alarm Indicator LED will blink. If an Alarm is active, the Alarm Indicator LED will remain on. Currently active Alerts and Alarms can be found in (Current Alarm, ALRM).

The controller generates two types of alarms. Automatic reset alarms will reset without any intervention if the condition that caused the alarm corrects itself. Manual reset alarms require the service technician to check for the alarm cause and reset the alarm. The following method must be followed to

Alarm Descriptor

Alarm Prefix

A1 – Compressor A1 Failure

B1 – Compressor B1 Failure

Co – Communication Failure

FC – Factory Configuration Error

MC – Master Chiller Configuration Error

P – Process Failure

Pr – Pressure Transducer Failure

Sr – Service Notification

th – Thermistor Failure

Alarm Suffix

Code Number to identify source

th .01

A30-4847

reset manual alarms:

Before resetting any alarm, first determine the cause of the alarm and correct it. To reset the alarm, set R.ALM to YES. The alarms will be reset. Indicator light will be turned off when switched correctly. Do not reset the chiller at random without first investigating and correcting the cause(s) of the failure.

Each alarm is described by a three or four-digit code. The first one or two digits indicate the alarm source and are listed in Fig. 52. The last two digits pinpoint the problem. See Table 49.

Fig. 52 — Alarm Description

68