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Carrier 30GN040-420 Ð Cooling External Temperature Reset, COMM Ð Communications Bus, Ð Power

Models: 30GN040-420

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Fig. 6 Ð Cooling External Temperature Reset

Fig. 6 Ð Cooling External Temperature Reset

	LEGEND
COMM Ð Communications Bus
PWR	Ð Power
SW	Ð Switch

NOTE: For speci®c connection points, see Fig. 25 - 29.

Fig. 7 Ð 4 IN/4 OUT Options Module Wiring for Reset, Demand Limit, and Dual Set Point

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Carrier 30GN040-420 Ð Cooling External Temperature Reset, COMM Ð Communications Bus, Ð Power, Ð Switch

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