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Carrier 30GN040-420 operating instructions Copyright 1995 Carrier Corporation

Models: 30GN040-420

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Copyright 1995 Carrier Corporation

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Book	2		PC 903	Catalog No. 563-079	Printed in U.S.A.	Form 30GN-3T	Pg 72	7-95	Replaces: 30G-1T
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Carrier 30GN040-420 operating instructions Copyright 1995 Carrier Corporation

Contents

Controls, Operation, and Troubleshooting ACCESSORY UNLOADER INSTALLATION30GN040-420 Keypad and Display ModuleSAFETY CONSIDERATIONS GENERALMAJOR SYSTEM COMPONENTS Table 1 Ð Unit Sizes and Modular CombinationsFig. 1 Ð 30GN Control Panel 040-110Unit Shown LEGEND CCN Ð Carrier Comfort NetworkTB Ð Terminal Block Keypad and Display Module Also Called HSIO Fig. 3 Ð Compressor Ground Fault Module Compressor Protection Control Module CPCSOPERATION 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 Head Pressure Control PumpoutKeypad and Display Module Also Called HSIO Fig. 4 Ð Keypad and Display ModuleTable 5 Ð Condenser Fan Sequence Table 6 Ð Keypad and Display Module Usage Table 7 Ð Functions and SubfunctionsTable 8 Ð Accessing Functions and Subfunctions Table 9 Ð Keypad Directory STATUS6 TEMPERATURE Table 9 Ð Keypad Directory cont STATUS contSUBFUNCTION KEYPAD ENTRYTable 9 Ð Keypad Directory cont STATUS cont SUBFUNCTIONKEYPAD ENTRY DISPLAYTable 9 Ð Keypad Directory cont STATUS cont TESTTable 9 Ð Keypad Directory cont TEST cont SCHEDULESERVICE Table 9 Ð Keypad Directory cont SCHEDULE contTable 9 Ð Keypad Directory cont SERVICE cont 3 ALARM/ALERT Table 9 Ð Keypad Directory cont HISTORYSUBFUNCTION KEYPAD ENTRYTable 9 Ð Keypad Directory cont SET POINT Example 1 Ð Reading Alarm Codes Example 2 Ð Reading Current Operating ModesTable 10 Ð Operational and Mode Display Codes Example 3 Ð Using Test Function Reset Set PointsChilled Fluid Set Point Pulldown Set PointExample 5A Ð External Reset Table 11 Ð Reset AmountsExample 4 Ð Reading and Changing Chilled Fluid Set PointExternally Powered Reset Example 5C Ð Using Return Fluid Temperature ResetFig. 5 Ð Cooling Return Fluid Reset Example 5B Ð 4 to 20 mA and Internally orFig. 6 Ð Cooling External Temperature Reset Ð PowerÐ Switch COMM Ð Communications BusFig. 8 Ð 4-20mA Cooling Temperature Reset Example 6 Ð Changing Reset TypeTable 12 Ð Service Functions Externally poweredTo Disable Demand Limit Example 7B Ð Using Demand Limit 4-20mAExample 8 Ð Setting Time of Day and Day of Week First Log On As Shown in TableFig. 9 Ð 4-20mA Demand Limiting Table 14 Ð Adjustable Field Congurations Table 13 Ð Factory Conguration KeystrokesTo change a conguration enter the new conguration and press while on the correct congurationExample 9 Ð Using the Schedule Function Example 9 Ð Using the Schedule Function contTROUBLESHOOTING Example 10 Ð Holiday Schedule FunctionFig. 10 Ð Sample Time Schedule 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 Electronic Expansion Valve EXV Fig. 12 Ð Electronic Expansion Valve EXVFig. 13 Ð EXV Cable Connections to EXV Driver Module, DSIO EXV6.Check operation of EXV TEMPERATURE TEMPERATURE 1.Disconnect transducer from the system FLUID-SIDETEMPERATURE THERMISTOR T2 COMPRESSOR SUCTION GAS TEMPERATUREALL UNITS AND FLUID-SIDETEMPERATURE Fig. 15 Ð Thermistor LocationsTRANSDUCER REPLACEMENT Control Modules ACCESSORY UNLOADER INSTALLATION Fig. 19 Ð Sensor Bus Wiring CommunicationsFig. 20 Ð Processor Module PSIO Fig. 21 Ð Low-VoltageRelay Module DSIOInstallation Fig. 22 Ð 4 In/4 Out Module SIOTable 19 Ð Troubleshooting Table 20 Ð Standard and Accessory Unloaders3.Wire in the solenoid valves pad display reads OUTPUTS. Press until displayPress The keypad LCD will displaySee Table Switch Inputs Fig. 26 − Demand Limit Ð 4-20mA SignalFig. 30 Ð Remote Reset from 4-20mA Signal Externally PoweredInstallation Fig. 34 Ð Remote AlarmREPLACING DEFECTIVE PROCESSOR MODULE Fig. 35 Ð InterlocksPage Copyright 1995 Carrier Corporation