Manuals / Carrier / Kitchen Appliance / Refrigerator

Carrier 30GN040-420 operating instructions

Models: 30GN040-420

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Loss of communication can be attributed to a grounded transformer with a secondary voltage of 21 vac supplying the PSIO, DSIO-LV, or 4 IN/4 OUT; the 12.5-vac trans- former supplying the DSIO-EXV module, or the 24-vac trans- former supplying PS1 for the transformers. These transformers should not be grounded, or serious damage to controls can result. Check to be sure the transformers are not grounded.

	LEGEND
CB	Ð Circuit Breaker
CGF	Ð	Ground Fault Module
COMM	Ð Communications Bus
CR	Ð Compressor Contactor Relay
DSIO	Ð	Relay Module (Low Voltage)	*And associated modular units.
HPS	Ð	High-Pressure Switch
LV	Ð	Low Voltage
PL	Ð	Plug
SNB	Ð	Snubber
TB	Ð	Terminal Block
TRAN	Ð	Transformer
U	Ð Unloader

Fig. 11C Ð 24-V Safety Circuit Wiring (130-210 and Associated Modular Units)

Loss of communication can be attributed to a grounded transformer with a secondary voltage of 21 vac supplying the PSIO, DSIO-LV, or 4 IN/4 OUT; the 12.5-vac trans- former supplying the DSIO-EXV module, or the 24-vac trans- former supplying PS1 for the transformers. These transformers should not be grounded, or serious damage to controls can result. Check to be sure the transformers are not grounded.

Code 36 Low refrigerant pressure, Circuit A (alert) Code 37 Low refrigerant pressure, Circuit B (alert)

If suction pressure transducer senses a pressure below set point for more than 5 minutes at start-up or more than 2 minutes during normal operation, affected circuit shuts down without going through the pumpout process. Reset is auto- matic when pressure reaches 10 psig above set point if there have been no previous occurrences of this fault on the same day. If this is a repeat occurrence on same day, then reset is manual, with LOCAL/ENABLE-STOP-CCN switch. Fac- tory con®gured set point is 27 psig for standard chillers and 12 psig for brine chillers.

Possible causes of fault are low refrigerant charge, faulty EXV, plugged ®lter drier, or faulty transducer.

Code 38 Failure to pump out, Circuit A (alert) Code 39 Failure to pump out, Circuit B (alert)

The pumpout process is terminated when saturated suc- tion temperature is 10° F (5.6° C) below temperature at be- ginning of pumpout, or 10° F (5.6° C) below leaving water temperature or reaches a saturated suction temperature of ±15 F (±26 C). If appropriate saturated suction temperature is not met within 3 minutes (on 2 consecutive tries), circuit shuts down without pumpout. Reset is manual with LOCAL/ ENABLE-STOP-CCN switch, and start-up follows normal sequence.

Possible causes for this alarm are a bad thermistor or trans- ducer or a faulty expansion valve.

Code 40 Low oil pressure, Circuit A (alert) Code 41 Low oil pressure, Circuit B (alert)

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Carrier 30GN040-420 operating instructions

Contents

ACCESSORY UNLOADER INSTALLATION Controls, Operation, and Troubleshooting30GN040-420 Keypad and Display ModuleGENERAL SAFETY CONSIDERATIONSMAJOR SYSTEM COMPONENTS Table 1 Ð Unit Sizes and Modular CombinationsTB Ð Terminal Block Fig. 1 Ð 30GN Control Panel 040-110Unit ShownLEGEND CCN Ð Carrier Comfort Network Keypad and Display Module Also Called HSIO Compressor Protection Control Module CPCS Fig. 3 Ð Compressor Ground Fault ModuleOPERATION DATA Table 3 Ð Thermistor and Transducer LocationsTable 4A Ð Capacity Control Steps Table 4A Ð Capacity Control Steps, 040-070cont Table 4A Ð Capacity Control Steps, 040-070cont LOADING SEQUENCE A LOADING SEQUENCE A LOADING SEQUENCE A UNIT LOADING SEQUENCE A LOADING SEQUENCE A A1*,B1 LOADING SEQUENCE A A1,kB1 LOADING SEQUENCE A LOADING SEQUENCE A LOADING SEQUENCE A LOADING SEQUENCE A LOADING SEQUENCE A LOADING SEQUENCE A Pumpout Head Pressure ControlKeypad and Display Module Also Called HSIO Fig. 4 Ð Keypad and Display ModuleTable 5 Ð Condenser Fan Sequence Table 7 Ð Functions and Subfunctions Table 6 Ð Keypad and Display Module UsageTable 9 Ð Keypad Directory STATUS Table 8 Ð Accessing Functions and SubfunctionsTable 9 Ð Keypad Directory cont STATUS cont 6 TEMPERATURESUBFUNCTION KEYPAD ENTRYSUBFUNCTION Table 9 Ð Keypad Directory cont STATUS contKEYPAD ENTRY DISPLAYTEST Table 9 Ð Keypad Directory cont STATUS contSCHEDULE Table 9 Ð Keypad Directory cont TEST contTable 9 Ð Keypad Directory cont SCHEDULE cont SERVICETable 9 Ð Keypad Directory cont SERVICE cont Table 9 Ð Keypad Directory cont HISTORY 3 ALARM/ALERTSUBFUNCTION KEYPAD ENTRYTable 9 Ð Keypad Directory cont SET POINT Example 2 Ð Reading Current Operating Modes Example 1 Ð Reading Alarm CodesTable 10 Ð Operational and Mode Display Codes Reset Set Points Example 3 Ð Using Test FunctionChilled Fluid Set Point Pulldown Set PointTable 11 Ð Reset Amounts Example 5A Ð External ResetExample 4 Ð Reading and Changing Chilled Fluid Set PointExample 5C Ð Using Return Fluid Temperature Reset Externally Powered ResetFig. 5 Ð Cooling Return Fluid Reset Example 5B Ð 4 to 20 mA and Internally orÐ Power Fig. 6 Ð Cooling External Temperature ResetÐ Switch COMM Ð Communications BusExample 6 Ð Changing Reset Type Fig. 8 Ð 4-20mA Cooling Temperature ResetTable 12 Ð Service Functions Externally poweredExample 7B Ð Using Demand Limit 4-20mA To Disable Demand LimitExample 8 Ð Setting Time of Day and Day of Week First Log On As Shown in TableFig. 9 Ð 4-20mA Demand Limiting Table 13 Ð Factory Conguration Keystrokes Table 14 Ð Adjustable Field CongurationsTo change a conguration enter the new conguration and press while on the correct congurationExample 9 Ð Using the Schedule Function cont Example 9 Ð Using the Schedule FunctionFig. 10 Ð Sample Time Schedule TROUBLESHOOTINGExample 10 Ð Holiday Schedule Function Cooling load satised Table 16 Ð Alarm and Alert Codes Table 16 Ð Alarm and Alert Codes cont Fig. 11A Ð 24-VSafety Circuit Wiring Code 30 Reset input failure 4 to 20 mA alert Loss of communication can be attributed to a grounded transformer with a secondary voltage of 21 vac supplying the PSIO, DSIO-LV,or 4 IN/4 OUT the 12.5-vactrans- former supplying the DSIO-EXVmodule, or the 24-vactrans- former supplying PS1 for the transformers. These transformers should not be grounded, or serious damage to controls can result. Check to be sure the transformers are not grounded Code 42 Cooler freeze protection alarm Fig. 12 Ð Electronic Expansion Valve EXV Electronic Expansion Valve EXVModule, DSIO EXV Fig. 13 Ð EXV Cable Connections to EXV Driver6.Check operation of EXV TEMPERATURE TEMPERATURE 1.Disconnect transducer from the system COMPRESSOR SUCTION GAS TEMPERATURE FLUID-SIDETEMPERATURE THERMISTOR T2ALL UNITS AND FLUID-SIDETEMPERATURE Fig. 15 Ð Thermistor LocationsTRANSDUCER REPLACEMENT Control Modules Fig. 19 Ð Sensor Bus Wiring Communications ACCESSORY UNLOADER INSTALLATIONFig. 20 Ð Processor Module PSIO Fig. 21 Ð Low-VoltageRelay Module DSIOFig. 22 Ð 4 In/4 Out Module SIO InstallationTable 20 Ð Standard and Accessory Unloaders Table 19 Ð Troubleshootingpad display reads OUTPUTS. Press until display 3.Wire in the solenoid valvesPress The keypad LCD will displaySee Table Fig. 26 − Demand Limit Ð 4-20mA Signal Switch InputsFig. 30 Ð Remote Reset from 4-20mA Signal Externally PoweredFig. 34 Ð Remote Alarm InstallationREPLACING DEFECTIVE PROCESSOR MODULE Fig. 35 Ð InterlocksPage Copyright 1995 Carrier Corporation