Carrier Air Conditioner specifications Alarm and Alert Codes cont

Table 29 — Alarm and Alert Codes (cont)

ALARM/	ALARM		WHY WAS THIS	ACTION TAKEN	RES	PROBABLE
ALERT	OR	DESCRIPTION	ALARM
				BY CONTROL	METHOD	CAUSE
CODE	ALERT		GENERATED?
T203	Alert	Loss of Communica-	Master MBB loses	Dual chiller control dis-	Automatic	Wiring error, faulty wir-
		tion with Slave Chiller	communication with	abled. Chiller runs as a		ing, failed Slave MBB
			Slave MBB	stand-alone machine.		module, power loss at
						Slave chiller, wrong
						slave address.
T204	Alert	Loss of Communica-	Slave MBB loses com-	Dual chiller control dis-	Automatic	Wiring error, faulty wir-
		tion with Master Chiller	munication with Master	abled. Chiller runs as a		ing, failed Master MBB
			MBB	stand-alone machine		module, power loss at
						Master chiller.
T205	Alert	Master and Slave	Master and slave chiller	Dual chiller routine dis-	Automatic	CCN Address for both-
		Chiller with Same	have the same CCN	abled. Master/slave run		chillers is the same.
		Address	address (CCN.A)	as stand-alone chillers.		Must be different.
						Check CCN.A under
						the OPT2 sub-mode in
						configuration at both
						chillers.
T206	Alert	High Leaving Chilled	LWT read is greater	Alert only. No action	Automatic	Building load greater
		Water Temperature	than LCW Alert Limit,	taken.		than unit capacity, low
			plus control point and			water/brine flow or
			Total capacity is 100%			compressor fault.
			and LWT is greater			Check for other
			than LWT reading one			alarms/alerts.
			minute ago
A207	Alarm	Cooler Freeze	Cooler EWT or LWT is	Chiller shutdown with-	Automatic for	Faulty thermistor (T1/
		Protection	less than freeze*	out going through	first occurrence	T2), low water flow.
				pumpdown. Cooler	of day. Manual
				pump continues to run	reset thereafter.
				(if control enabled).
A208	Alarm	Low Cooler Fluid Flow	Cooler EWT is less	Chiller shutdown with-	Manual	Faulty cooler pump,
			than LWT by 3° F	out going through		low water flow, plugged
			(1.7° C) for 1 minute	pumpdown. Cooler		fluid strainer.
			after a circuit is started	pump shut off (if control
				enabled).
T950	Alert	Loss of Communica-	No communications	WSM forces removed.	Automatic	Failed module, wiring
		tion with WSM	have been received by	Chiller runs under own		error, failed trans-
			MBB within 5 minutes	control.		former, loose connec-
			of last transmission			tion plug, wrong
						address.
T951	Alert	Loss of Communica-	No communications	FSM forces removed.	Automatic	Failed module, wiring
		tion with FSM	have been received by	Chiller runs under own		error, failed trans-
			MBB within 5 minutes	control.		former, loose connec-
			of last transmission			tion plug, wrong
						address.

	LEGEND
CCN	— Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB	— Compressor Expansion Board
EMM	— Energy Management Module
EXV	— Electronic Expansion Valve
FSM	— Flotronic™ System Manager
LCW	— Leaving Chilled Water
LWT	— Leaving Fluid Temperature
MBB	— Main Base Board
MOP	— Maximum Operating Pressure
WSM	— Water System Manager

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze is CSP.1 –8° F (4.4 C) for single set point and lower of CSP.1 or CSP.2 –8° F (4.4 C) for dual set point configuration.

NOTE: The following table shows illegal configurations:

1Unit type = 0.

24 Compressors in a circuit with 2 unloaders.

34 Compressors in a circuit with 1 unloader and hot gas bypass.

42 Unloaders and hot gas bypass in a circuit.

5More than one compressor difference between circuits (e.g., 4 compressors in Ckt A, 2 in Ckt B).

6Water cooled units with optional thermistors and configured for head pressure control.

7Split system chillers with optional thermistors and configured for head pressure control.

8Low temperature brine selected for air cooled chillers or split systems with air cooled head pressure control.

9Water cooled unit configured for air cooled head pressure control.

Air cooled head pressure control with common fan staging

10and different head pressure control methods for each circuit (EXV controlled vs. set point controlled).

11Lead/lag enabled, Master selected and Cooling Set Point select is LWT POT.

12Water cooled or split units (units types 2, 3, 4) with more than one compressor on a circuit.

13Condenser pump interlock enabled on air cooled unit.

14Unit type changed.

15Low pressure set points out of range.

16Cooler fluid type is water and ice mode is enabled.

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