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Carrier 30GN040-420 operating instructions Transducer Replacement

Models: 30GN040-420

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TRANSDUCER REPLACEMENT

Fig. 17 Ð Lead Compressor Transducer and Thermistor Locations

TRANSDUCER REPLACEMENT

Transducers are installed directly in the refrigerant cir- cuit. Relieve all refrigerant pressure using standard re- frigeration practices before removing.

1.Relieve refrigerant pressure using standard refrigeration practices.

2.Disconnect transducer wiring at transducer by pulling up on locking tab while pulling weathertight connection plug from end of transducer. Do not pull on transducer wires.

3.Unscrew transducer from 1¤4-in. male ¯are ®tting. When installing new pressure transducer, do not use thread sealer. Thread sealer can plug transducer and render it inoperative.

4.Insert weathertight wiring plug into end of transducer un- til locking tab snaps in place.

5.Check for refrigerant leaks.

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Carrier 30GN040-420 operating instructions Transducer Replacement

Contents

30GN040-420 Controls, Operation, and TroubleshootingACCESSORY UNLOADER INSTALLATION Keypad and Display ModuleMAJOR SYSTEM COMPONENTS SAFETY CONSIDERATIONSGENERAL 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 OPERATION DATA Fig. 3 Ð Compressor Ground Fault ModuleCompressor Protection Control Module CPCS 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 Keypad and Display Module Also Called HSIO Head Pressure ControlPumpout 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 STATUSKEYPAD ENTRY Table 9 Ð Keypad Directory cont STATUS contSUBFUNCTION DISPLAYKEYPAD ENTRY Table 9 Ð Keypad Directory cont STATUS contSUBFUNCTION 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 SUBFUNCTION 3 ALARM/ALERTTable 9 Ð Keypad Directory cont HISTORY 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 Chilled Fluid Set Point Example 3 Ð Using Test FunctionReset Set Points Pulldown Set PointExample 4 Ð Reading and Changing Example 5A Ð External ResetTable 11 Ð Reset Amounts Chilled Fluid Set PointFig. 5 Ð Cooling Return Fluid Reset Externally Powered ResetExample 5C Ð Using Return Fluid Temperature Reset Example 5B Ð 4 to 20 mA and Internally orFig. 6 Ð Cooling External Temperature Reset Ð PowerÐ Switch COMM Ð Communications BusExternally powered Example 6 Ð Changing Reset TypeTable 12 Ð Service Functions Internally poweredExample 8 Ð Setting Time of Day and Day of Week To Disable Demand LimitExample 7B Ð Using Demand Limit 4-20mA First Log On As Shown in TableFig. 9 Ð 4-20mA Demand Limiting To change a conguration enter the new conguration Table 14 Ð Adjustable Field CongurationsTable 13 Ð Factory Conguration Keystrokes and press while on the correct congurationExample 9 Ð Using the Schedule Function Example 9 Ð Using the Schedule Function contFig. 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 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 Fig. 16 Ð Thermistors Fig. 15 Ð Thermistor LocationsCircuits A and B, Lead Compressor Only FLUID-SIDETEMPERATURE THERMISTOR T2TRANSDUCER REPLACEMENT Control Modules Fig. 20 Ð Processor Module PSIO ACCESSORY UNLOADER INSTALLATIONFig. 19 Ð Sensor Bus Wiring Communications 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 UnloadersPress 3.Wire in the solenoid valvespad display reads OUTPUTS. Press until display The keypad LCD will displaySee Table Fig. 30 Ð Remote Reset from 4-20mA Signal Switch InputsFig. 26 − Demand Limit Ð 4-20mA Signal Externally PoweredREPLACING DEFECTIVE PROCESSOR MODULE InstallationFig. 34 Ð Remote Alarm Fig. 35 Ð InterlocksPage Copyright 1995 Carrier Corporation