Carrier 30GN040-420 operating instructions Cpcs, Fsm, Wsm

Table 16 Ð Alarm and Alert Codes (cont)

	ALARM		ACTION TAKEN	CIRCUIT	RESET
DISPLAY	OR	DESCRIPTION	BY CONTROL	PUMPDOWN	METHOD		PROBABLE CAUSE
	ALERT
63	Alarm	Complete unit shutdown	Alarm only	Ð	Auto.		Check individual alarms
64	Alert	Loss of charge, circuit A	Circuit cannot start	Ð	Auto.		Refrigerant leak or transducer
65		Loss of charge, circuit B	Circuit cannot start	Ð	Auto.		failure
66	Alarm	FSM communication loss	FSM forces removed	Ð	Auto.		Wiring faulty or module failure
67	Alarm	Transducer calibration date code failure	Unit cannot start	Ð	Auto.		Incorrect date code entered
68,69	Ð	Not used	Ð	Ð	Ð	Ð
70	Alert	High leaving chilled ¯uid temperature	Alarm only	Ð	Auto.		Building load greater than unit capacity,
							low water/brine ¯ow, or compressor
							fault. Check for other alarms or alerts.

	LEGEND	*Reset automatic ®rst time, manual if repeated same day.
CPCS	Ð Compressor Protection Control Module
FSM	Ð Flotronic™ System Manager
PS	Ð Power Supply
WSM	Ð Water System Manager

Possible causes of failure:

1.High-Pressure Switch Open Ð High-pressure switch for each compressor is wired in series with 24-v power that energizes compressor control relay. If high-pressure switch opens during operation, compressor stops. This is detected by microprocessor through the feedback terminals.

2.DSIO-LV or DSIO-EXV Module Failure Ð If a DSIO-LV relay module relay fails open or closed, microprocessor detects this, locks compressor off, and indicates an error.

3.Wiring Errors Ð If a wiring error exists causing CPCS, CR, or feedback switch to not function properly, micro- processor indicates an error.

4.Processor (PSIO) Failure Ð If hardware that monitors feedback switch fails, or processor fails to energize relay module relay to on, an error may be indicated.

NOTE: The control does not detect circuit breaker fail- ures. If a circuit breaker trips on lead compressor in a circuit, a low oil pressure failure is indicated. On the other compressors, no failure is indicated.

5.Ground Fault Module on 130-210 and associated modu- lar units (CGFA or CGFB) Open Ð Module contacts are in lead compressor circuits, but ground fault could be in any compressor in affected circuit.

Ground fault of any 040-110 and associated modular unit compressor (®eld-supplied accessory on 040-060 and 070, 60 Hz units; standard on 070, 50 Hz and 80-110 and as- sociated modular units) will cause a trip.

6.Checkout Procedure Ð Shut off main power to unit. Turn

on control power, then step through subfunc-

tion to proper compressor number (i.e., failure

code 5 is compressor B1). Next, energize the step. If step works correctly, then failure code is caused by:

·HPS (high-pressure switch) open

·Misplaced feedback wire from J4 and J5 terminals

·Ground wire and 24-v feeds reversed on one or more points on J3

Compressor Alarm/Alert Circuit Ð For compres- sor A1 circuit, processor closes contacts between J4 termi- nals 2 and 3 to start compressor. See Fig. 11A-11C. Safeties shown to left of J4 must be closed in order for power to reach compressor control relay, and the feedback input ter- minals on J3.

Failure of power to terminal 1 on J3, when contacts be- tween 2 and 3 on J4 should be closed, causes a code 1 alert.

Terminal 2 on J3 is the other leg of the compressor A1 feedback channel. It is connected to the 24-v common.

NOTE: Similar connections for each compressor can be fol- lowed on the unit wiring diagrams located on the unit.

Code 9 Leaving ¯uid thermistor failure (alarm) Code 10 Entering ¯uid thermistor failure (alarm)

If temperature measured by these thermistors is outside range of ±40 to 240 F (±40 to 116 C), unit shuts down after going through a normal pumpout. Reset is automatic if tem- perature returns to the acceptable range, and unit start-up fol- lows normal sequence. The cause of the fault is usually a bad thermistor, wiring error, or loose connection.

Code 19 Compressor A1 suction sensor failure (alert)

Code 20 Compressor B1 suction sensor failure (alert)

On units with thermistors, if temperature measured by these thermistors is outside the range of ±40 to 240 F (±40 to 116 C), affected circuit shuts down after going through a nor- mal pumpout. Other circuit continues to run. Reset is auto- matic if temperature returns to the acceptable range, and cir- cuit start-up follows normal sequence. The cause of this fault is usually a bad thermistor, wiring error, or loose connection.

On units with transducers, if the saturated suction tem- perature is greater than the leaving ¯uid temperature plus 10° F (5.5 C) for more than 5 minutes, the affected circuit shuts down (after going through normal pumpout). The reset is automatic if the saturated suction temperature returns to the acceptable range and start-up follows the normal se- quence. The cause of this fault is usually a bad transducer, a wiring error, or a loose connection.

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