Carrier 040-420 specifications i2G7, Cpcs, ’ Sl, C R ’ S, Fig. IOA - 24-VSafety Circuit Wiring

Possible causes of fault are low refrigerant charge, plugged filter drier, or a faulty EXV or thermistor.

Code 48 Low suction superheat, Circuit A Code 49 Low suction superheat, Circuit B

If EXV is at minimum position, suction superheat is less than 10” F (5.5” C) or saturated evaporator temperature is greater than MOP (maximum operating pressure) for more than 5 minutes, affected circuit shuts down after going through pumpout process, Reset is manual with LOCAL/ENABLE- STOP-CCN switch, and start-up follows normal sequence.

Possible causes of fault are faulty EXV or thermistor. Code 50 Illegal configuration

This fault indicates a configuration error. Unit is not al- lowed to start. Check all configuration data and set points and correct any errors.

Code 51 Initial configuration required

i2G7

This fault indicates factory configuration has not been done, and unit is not allowed to start. Refer to unit wiring label diagrams for factory configuration codes, There are 8 groups of S-digit numbers that must be entered. The first

4groups must be entered under s17ubafu n c t i o n . G r o u p s

7and 8 must be entered under MHs u b f u n c t i o n .

Enter each group, then press the H key. Use the

down arrow 0+ after each group to bring up the next

empty screen. Unit should start after factory and field con- figurations are correctly entered.

The usual cause of this fault is replacement of the pro- cessor module. Refer to instructions accompanying the re- placement module.

Code 52 Emergency stop by CCN command.

Unit goes through normal shutdown when this command is received, and goes through normal start-up when com- mand is cancelled.

S T A N D A R D : 040-060	50	H z	r - - - -	I - - - -	- -
040-070	60	H z	,	[CPCS	’ Sl
			1 C R ’ S

							LEGEND
S T A N D A R D :	070 50	Hz				Contactor
A C C E S S O R Y :	60	50	H z	&I		Circuit	Breaker
	040-070	60		C O M M		Communications Bus
				CPCS		Compressor Protection
						Control	Module
				CR		Compressor Contactor Relay
				D G T		Discharge Gas Thermostat (Optional)
				DSIO		Relay	Module (Low Voltage)
				HPS	-	High-Pressure Switch
						Low Vottage
				K		Plug
				PWR		Power
				SNB	-	Snubber
				TB		Terminal Block
				TRAN	-	Transformer
				U	-	Unloader

Fig. IOA - 24-V Safety Circuit Wiring (040-070)

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