Carrier 040-420 specifications Pressure Transducer

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Thermistors - All thermistors are identical in their tem- perature vs. resistance performance. Resistance at various temperatures are listed in Tables 15 and 16.

LOCATION - General location of thermistor sensors are shown in Fig. 13.

Cooler Leaving Water Thermistor (Tl) - Tl is located in leaving water nozzle. The probe is immersed directly in the water. All thermistor connections are made through a %-in. coupling. See Fig. 15. Actual location is shown in Fig. 13 and 14.

Cooler Entering Water Thermistor (T2) - T2 is located in cooler shell in first baffle space near tube bundle. Ther- mistor connection is made through a %-in. coupling. See Fig. 15. Actual location is shown in Fig. 13 and 14.

Compressor Suction Gas Temperature Thermistors (T7 and T8) - T7 and T8 are located in lead compressor in each circuit in suction passage between motor and cylinders, above oil pump. They are well-type thermistors on 040-210 and associated modular units, or ferrule-type on 225, 250, 280 units. See Fig. 13 and 14.

THERMISTOR REPLACEMENT (Tl , T2, T7, TS) (Com- pressor and Cooler)

Thermistors are installed directly in fluid or refrigerant circuit. Relieve all refrigerant pressure using standard refrigerant practices or drain fluid before removing.

Proceed as follows (see Fig. 15):

To replace sensors Tl, T2, T7 (225,250,280), and T8 (225,250,280)

1. Remove and discard original thermistor and coupling.

IMPORTANT: Do not disassemble new coupling.

 

Install as received.

I

 

2.Apply pipe sealant to ‘/a-in. NPT threads on replace- ment coupling and install in place of original. Do not use packing nut to tighten coupling. This damages fer- rules (see Fig. 15).

3.Insert new thermistor in coupling body to its full depth. If thermistor bottoms out before full depth is reached, pull thermistor back out I/s in, before tightening packing nut. Hand tighten packing nut to position ferrules, then finish tightening 19’4 turns with a suitable tool. Ferrules are now attached to thermistor which can be withdrawn from coupling for unit servicing.

To replace thermistors T7 and T8 (040-210 and associated modular units):

Add a small amount of thermal conductive grease to ther- mistor well. Thermistors are friction-fit thermistors, which must be slipped into receiver located in the compressor pump end.

Pressure Transducers - TW O tvpes of pressure trans- ducers are used on 30G Flotronic’” Ii*chille&: a low pres- sure transducer and a high pressure transducer. The low pressure transducer is identified by a white dot on the body of the transducer, and the high pressure transducer by a red dot. See Fig. 16.

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 rectifier which changes 24 vat to 5 vdc.

TROUBLESHOOTING - If transducer is suspected of be- ing faulty, first check supply voltage to transducer. Supply voltage should be 5 vdc + .2 v. If supply voltage is cor- rect, compare pressure reading displayed on keypad and dis- play module against pressure shown on a calibrated pres- sure gage. If the 2 pressure readings are not reasonably close, replace pressure transducer.

TRANSDUCER REPLACEMENT

rTransducers 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 weather-tight connection pfug from end of transducer. Do not pull on trans- ducer wires.

3.Unscrew transducer from !&in. male flare fitting. 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 until locking tab snaps in place.

5.Check for refrigerant leaks.

-75”

l/4” SAE FEMALE FLARE

WHITE DOT-LOW PRESSURE TRANSDUCER

RED DOT -HIGH PRESSURE TRANSDUCER

SAE - Society of Automotive Engineers

Fig. 16 - Pressure Transducer

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Contents Contrc Unit Sizes and Modular Combinations Unit ModelKeypaddisplay Ground Fault Interrupter Source PSIRELAY, B FieldLOCAL/ENABLE-STOP-CCN Switch Positions and Operation Compressor Protection Control Module CpcsThermistor and Transducer Locations ThermistorsCapacity Control StepsLoading Sequence a Loading Sequence B Unit Control StepsCapacity Control Steps, 040-070 cant 060A\~**HzLoading Sequence a Loading Sequence B Unit Capacity Control Steps, 040-070 cant Oy&yaFBI Aiti 08Aqy,yA4l&pi’ Steps BP’Loading Loading Sequence B Unit Control Altt Bitt Wtf2Z$’Altt Loading Sequence a Loading Equence B UnitAmrox ’tt$-t&Z3 Displacement Compressors UWrW Arwox A2.p $#l 110 50 Hz Loading Sequence a Quence B Unit ControlAlt,Blv Displacement Compressors Mvrox Loading Equence aEquence B Awrox Drt,t 130, 24OA130,24OA 130, 240AAttll’ Loading Equence a UnitA2.p T3gLoading Sequence a Sequence B Unit $$V LOAD11 Control Size StepsLoadin Sequence B Unit Displacement Compressors UVvW PWprox 8514wB2,B3 Al% Al’,BILoading Sequence B Unit 30GT Displacement Compressors Awox Capacity Control Steps, 225, 250,280Loac \IG Sequence a Loading Sequence B Unit Capacity Control Steps, 225, 250,280 cant Loac30GT Capacity Control Steps, 225, 250, 280 cant 2501G Sequence a Loading Sequence B Unit ControlCondenser Fan Sequence FAN Arrangement FAN Numbers Contactor ControlledCondenser Fan Sequence cant FAN Arrangement FAN Numbers~jACToR 30GT250 60 HzKeypad and Display Module Also Called Hsio Keypad and Display Module UsageAccessing Functions and Subfunctions Functions and SubfunctionsFunctions Operation Keypad Display Description Entry ResponseKeypad Directory Keypad Directory cant Status cant Subfunction Keypadentry Display CommentPressure AnalogSubfunction Outputs Display Subfunction Keypad Entry Display Comment OutputsOutputs HgbraKeypad Directory cant Test cant Subfunction Keypad Entry Display Comment OverrideClock Select QzqKeypad Directory Schedule cant Keypad Directory cant Service cord Keypad Directory cant Example 1 Reading Alarm Codes Operationat and Mode Display CodesLocal on Cool Alarms Modes Local on M O D E Example 2 Reading Current Operating ModesKeypad Display Example 3 Using Test Function Example 4 Reading and Changing Chilled Water Set PointKeypad Display Comments Entry Response Example 5 Using Return Water Temperature Reset Keypad Display CommentsCRST2 CrstiExample 6 Changing Reset Type Reset Reference Temperature Outdoor AIR 1OR Space TempEKE Keypad Display Entry Response FLD CFG Ertyp Lstyp DemandPpiq Example 8 Setting Time of Day Day of Week Demand LimitingMAX Demand Kimax = Factory Configuration Keystrokes Adjustable Field ConfigurationsExample 9 Using the Schedule Function DisplayExample 9 Using the Schedule Function cant Example 10 Holiday Schedule FunctionTypical Stoppage Faults and Reset Types Complete Unit Stoppage Complete unit stopAlarm Codes Action Taken Probable Cause N T R O LPage Page ’ Sl R ’ STnanz Switch CGFCompressor Contactor Relay SNBFig. IOD 24-V Safety Circuit Wiring 225, 250, and 280 Units Electronil c Expansion Valve EXV Page Thermistor and Pressure Transducer Locations Refrigerant Temperature Sensor T7, T8 040-210 SuctionAssociated Modular Units Pressure Transducer 2i.b Voltage Drop Voltage Resistance DropEqualizer OIL Pressure Suction Pressure Sight Glass Line Transducer Each CompressorControl Modules PSIO, SIO Address SelectorSensor Bus Wiring Communications Processor Module PsioComm Troubleshooting Standard and Accessory Unloaders 1NO. of AccessoryCircuit Circuit B Or2 30GN190-210 3OGT225,250,280 Accessory Unloader Control Wiring 080-110 SO/SO Hz and 130 60 HzHgbpr TLNContactor Switch Circuit Breaker Transformer LmyTEF4Module STAGE2Module J7-15Thermistor ElJ7-16Installation Remote Dual Set Point ControlPage Page Copyright 1994 Carrier Corporation

040-420 specifications

The Carrier 040-420 is a highly regarded commercial HVAC unit specifically designed for efficient heating and cooling in medium- to large-sized buildings. Known for its reliability and advanced technology, this system is ideal for a variety of applications ranging from offices to industrial spaces.

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