Manuals / Carrier / Kitchen Appliance / Refrigerator

Carrier 30GN040-420 operating instructions Disconnect transducer from the system

Models: 30GN040-420

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1.Disconnect transducer from the system.

LEGEND

DPT Ð Discharge Pressure Transducer

EXV Ð Electronic Expansion Valve

OPT Ð Oil Pressure Transducer

SPT Ð Suction Pressure Transducer

T Ð Thermistor Number

Fig. 14 Ð Thermistor and Pressure Transducer Locations

Pressure Transducers Ð A single style of pressure transducer is used for both high- and low-pressure sensing on Flotronic™ II chillers. However, this transducer must be calibrated before the unit will operate. On new units, this will have been done at the factory in order to test run the unit. If a transducer or PSIO is replaced in the ®eld, how- ever, the transducer will have to be ®eld calibrated as follows:

1.Disconnect transducer from the system.

2.Hang the transducer in the atmosphere.

3.Press on the HSIO keypad, and Read the pres- sure. Pressures before calibration must be within the range of 6 5 psig. If the pressure is outside the range of 6 5 psig, the HSIO display will read ---. If this is the case, replace the transducer or PSIO or check for a wir- ing error. If the value of the atmospheric pressure is greater than 5 psig or less than ±5 psig, the transducer will be considered out of range and will not calibrate.

4. Press on the HSIO keypad. This automatically ap-

plies the proper correction factor to all future inputs from the transducer.

Three pressure transducers are mounted on each lead com- pressor: 2 low-pressure transducers to monitor compressor suction pressure and oil pressure, and a high-pressure trans- ducer to monitor compressor discharge pressure (see Fig. 17 for exact locations on compressor). Each transducer is supplied with 5 vdc power from a recti®er which changes 24 vac to 5 vdc.

TROUBLESHOOTING Ð If transducer is suspected of be- ing faulty, ®rst check supply voltage to transducer. Supply voltage should be 5 vdc ± .2 v. If supply voltage is correct, compare pressure reading displayed on keypad and display module against pressure shown on a calibrated pressure gage. If the 2 pressure readings are not reasonably close, replace pressure transducer.

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Carrier 30GN040-420 operating instructions Disconnect transducer from the system

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