Carrier 69NT40-511-1, 69NT40-521 Controller Alarm Indications, Model 69NT40-511-72, ALL Models

		Table 3-4. Controller Alarm Indications
CODE	TITLE	DESCRIPTION
#
		MODEL 69NT40-511-72
	Evaporator Fan	Alarm 11 is triggered by the opening of the internal protector for evaporator fan
AL11		motor #1. This alarm will disable the probe check portion of defrost and the probe
	Motor 1 Safety	diagnostic logic.
	Evaporator Fan	Alarm 12 is triggered by the opening of the internal protector for evaporator fan
AL12		motor #2. This alarm will disable the probe check portion of defrost and the probe
	Motor 2 Safety	diagnostic logic.
		ALL MODELS
AL20	Control Circuit Fuse	Alarm 20 is triggered by fuse (F3) opening and will cause the software shutdown
	Open (24 vac)	of all control units. This alarm will remain active until the 15 amp fuse is replaced.
		Alarm 21 is triggered by one of the fuses (F1/F2) being opened on 18 volts AC
AL21	Micro Circuit Fuse	power supply to the Controller. The suction modulation valve (SMV) will be
	Open (18 vac)	opened and current limiting is halted. The compressor will cycle. Temperature
		control will be maintained by cycling the compressor.
		Alarm 22 is triggered by the opening of the evaporator motor internal protector.
AL22	Evaporator Fan	This alarm will disable all control units until the motor protector resets. Also, refer
	Motor Safety	to code Cd29.If the unit is configured for single evaporator fan operation, alarm
		AL22 will also activate if alarms AL11 and AL12 are active simultaneously.
AL23	KA2--KB10 Jumper	Alarm 23 is triggered by a missing jumper wire. The alarm will stay active until the
	Disconnected	jumper wire is reconnected.
	Compressor Motor	Alarm 24 is triggered by the opening of the compressor motor internal protector.
AL24		This alarm will disable all control units except for the evaporator fans and will
	Safety	remain active until the motor protector resets. Also, refer to code Cd29.
		Alarm 25 is triggered by the opening of the condenser motor internal protector
AL25	Condenser Fan	and will disable all control units except for the evaporator fans. This alarm will
	Motor Safety	remain active until the motor protector resets. This alarm is deactivated if the unit
		is operating on water cooled condensing.
	All Supply and	Alarm 26 is triggered if the Controller determines that all of the control sensors
		are out-of-range. This can occur for box temperatures outside the range of --50_C
AL26	Return Air Control
		to +70_C (--58_F to +158_F). This alarm triggers the failure action code set by	3
	Sensors Failure
		Function Code Cd29.	SECTION
		The Controller has a built-in Analog to Digital (A-D) converter, used to convert
		analog readings (i.e. temperature sensors, current sensors, etc.) to digital
AL27	Probe Circuit	readings. The Controller continuously performs calibration tests on the A-D
	Calibration Failure	converter. If the A-D converter fails to calibrate for 30 consecutive seconds, this
		alarm is activated.This alarm will be inactivated as soon as the A-D converter
		calibrates.
		During start-up diagnostics, the EEPROM is examined to determine validity of its
		contents. This is done by testing the set point and the alarm list. If the contents
		are invalid, Alarm 51 is activated.During control processing, any operation
AL51	Alarm List Failure	involving alarm list activity that results in an error will cause Alarm 51 to be
		activated.Alarm 51 is a “display only” alarm and is not written into the alarm list.
		Pressing the ENTER key when “CLEAr” is displayed will result in an attempt to
		clear the alarm list. If that action is successful (all alarms are inactive), Alarm 51
		will be reset.
		Alarm 52 is activated whenever the alarm list is determined to be full; at start-up
AL52	Alarm List Full	or after recording an alarm in the list. Alarm 52 is displayed, but is not recorded in
		the alarm list. This alarm can be reset by clearing the alarm list. This can be done
		only if all alarms written in the list are inactive.

3-11 T-268-07