Carrier 040-420 specifications

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Possible causes of failure:

1.High-Pressure Switch Open - High-pressure switch for each compressor is wired in series with 24-v power that energizes compressor control relay. If high-pressure switch opens during operation, compressor stops. This is detected by microprocessor through the feedback terminals.

3 DSIO-LV or DSIO-EXV Module Failure - If a DSIO-LV

d.

relay module relay fails open or closed, microprocessor detects this, locks compressor off and indicates an error.

3 . Wiring Errors - If a wiring error exists causing CPCS, CR, or feedback switch not to function properly, micro- processor indicates an error.

4.Processor (PSIO) Failure - If hardware that monitors feedback switch fails, or processor fails to energize re- lay module relay to on, an error may be indicated.

NOTE: The control does not detect circuit breaker fail- ures. If a circuit breaker trips on lead compressor in a circuit, a low oil pressure failure is indicated. On the other compressors, no failure is indicated.

5 . Ground Fault Module on 130-2 10, 225, 250, 280, and associated modular units (CGFA or CGFB) Open - Mod- ule contacts are in lead compressor circuits, but ground fault could be in any compressor in affected circuit.

Ground fault of any 040-l 10 and associated modular unit compressor (field-supplied accessory on 040-060 and 070,

60Hz units; standard on 070, 50 Hz and 80-l 10 and as- sociated modular units) will cause a trip.

6.Checkout Procedure - Shut off main power to unit. Turn on control power, then step through subfunc-

tion MFi to proper compressor number (i.e., failure

code 5 is compressor Bl). Next, energize the step. If step works correctly, then failure code is caused by:

• HPS (high-pressure switch) open

• Misplaced feedback wire from 54 and J5 terminals

0 Ground wire and 24-v feeds reversed on one or more points on 53

Compressor Alarm Circuit - For compressor Al alarm circuit, processor closes contacts between 54 termi- nals 2 and 3 to start compressor. See Fig. 10A - 10D. Safe- ties shown to left of 54 must be closed in order for power to reach compressor control relay, and the feedback input ter- minals on J3.

Failure of power to terminal 1 on 53, when contacts be- tween 2 and 3 on J4 should be closed, causes a code 1 alarm.

Terminal 2 on 53 is the other leg of the compressor Al feedback channel. It is connected to the 24-v common.

NOTE: Similar connections for each compressor can be fol- lowed on the unit wiring diagrams located on the unit.

Code 9 Leaving water thermistor failure Code 10 Entering water thermistor failure

If temperature measured by these thermistors is outside range of -40 to 240 F (-40 to 116 C), unit shuts down after going through a normal pumpout. Reset is automatic if tem- perature returns to the acceptable range, and unit start-up follows normal sequence. Cause of fault is usually a bad thermistor, wiring error, or loose connection.

Code 19 Compressor Al suction sensor failure

Code 20 Compressor Bl suction sensor failure

On units with thermistors, if temperature measured by these thermistors is outside the range of -40 to 240 F (-40 to 116 C), affected circuit shuts down after going through a normal pumpout. Other circuit continues to run. Reset is automatic if temperature returns to the acceptable range,

and circuit start-up follows normal sequence. Cause of this- fault is usually a bad thermistor, wiring error or loose connection.

On units with transducers, if the saturated suction tem- perature is greater than the leaving water temperature plus 10” F (5.5 C) for more than 5 minutes, the affected circuit shuts down (after going through normal pumpout). The re- set is automatic if the saturated suction temperature returns to the acceptable range and start-up follows the normal se- quence. Cause of this fault is usually a bad transducer, a wiring error, or a loose connection.

Code 21 Reset thermistor failure (applies only to installa- tions having external temperature reset)

If temperature measured by this thermistor is outside range of 40 to 240 F (-40 to 116 C), reset function is disabled and unit controls to normal set point. If temperature returns to the acceptable range, reset function is automatically en- abled. Cause of this fault is usually a bad thermistor, wir- ing error or loose connection.

Code 22 Compressor A 1 discharge pressure transducer failure

Code 23 Compressor B 1 discharge pressure transducer failure

Code 24 Compressor A 1 suction pressure transducer failure

Code 25 Compressor B 1 suction pressure transducer failure

Code 26 Compressor Al oil pressure transducer failure Code 27 Compressor Bl oil pressure transducer failure

If output voltage of any of these transducers is greater than 5 v, affected circuit shuts down without going through pumpout process. Other circuit continues to run. Reset is automatic if output voltage returns to the acceptable range, and circuit start-up follows normal sequence. Cause of fault is usually a bad transducer or a wiring error.

Code 28 Low transducer supply voltage

If transducer supply voltage is less than 4.5 v or greater than 5.5 v, unit shuts down without going through pumpout process. Reset is automatic if supply voltage returns to the acceptable range, and circuit start-up follows normal se- quence. Cause of fault is usually a faulty transformer, or primary voltage is out of range.

The voltage supplied to the processor is polarized. When checking for proper voltage supply, be sure to consider this polarity. If voltage appears to be within acceptable toler- ance, check to be sure the transformer supplying PSl is not grounded. Grounding the supply transformer can result in serious damage to the control system.

Code 29 Chilled water pump interlock switch open (applies only if unit is configured for use with a chilled water pump interlock).

Code can occur under any of these conditions:

1.Interlock switch fails to close within o n e minute after chilled water pump starts

2.Interlock switch opens during unit operation

3.Interlock voltage is detected, but unit is not configured for interlock

4.Interlock voltage is outside its valid range

If any of these conditions occur, all compressors are dis- abled and, if running, shutdown occurs without pumpout. Chilled water pump also shuts down. Reset is manual, with LOCAL/ENABLE-STOP-CCN switch. Most probable cause of this fault is shutdown or failure of chilled water pump to start. Other possibilities are improper configuration or wir- ing errors.

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Contents Contrc Unit Sizes and Modular Combinations Unit ModelRELAY, B Keypaddisplay Ground Fault InterrupterSource PSI FieldThermistor and Transducer Locations LOCAL/ENABLE-STOP-CCN Switch Positions and OperationCompressor Protection Control Module Cpcs ThermistorsLoading Sequence a Loading Sequence B Unit Control CapacityControl Steps StepsLoading Sequence a Loading Sequence B Unit Capacity Control Steps, 040-070 cant060A\~**Hz FBI Capacity Control Steps, 040-070 cantOy&ya A4l&pi’ Aiti08Aqy,y Steps BP’Loading Loading Sequence B Unit Control Altt Altt BittWtf2Z$’ Loading Sequence a Loading Equence B Unit$-t&Z3 Amrox’tt Alt,Blv Displacement Compressors UWrW Arwox A2.p $#l 110 50 HzLoading Sequence a Quence B Unit Control Equence B Displacement Compressors MvroxLoading Equence a 130,24OA Awrox Drt,t130, 24OA 130, 240AAttll’ Loading Equence a UnitLoading Sequence a Sequence B Unit A2.pT3g $$V LOAD11 Control Size StepsLoadin Sequence B Unit B2,B3 Displacement Compressors UVvW PWprox8514w Al% Al’,BILoading Sequence B Unit Loac \IG Sequence a Loading Sequence B Unit 30GT Displacement Compressors AwoxCapacity Control Steps, 225, 250,280 30GT Capacity Control Steps, 225, 250,280 cantLoac 1G Sequence a Capacity Control Steps, 225, 250, 280 cant250 Loading Sequence B Unit ControlCondenser Fan Sequence FAN Arrangement FAN Numbers Contactor Controlled~jACToR Condenser Fan Sequence cantFAN Arrangement FAN Numbers 30GT250 60 HzKeypad and Display Module Also Called Hsio Keypad and Display Module UsageFunctions Accessing Functions and SubfunctionsFunctions and Subfunctions Operation Keypad Display Description Entry ResponseKeypad Directory Pressure Keypad Directory cant Status cantSubfunction Keypadentry Display Comment AnalogOutputs Subfunction Outputs DisplaySubfunction Keypad Entry Display Comment Outputs HgbraClock Select Keypad Directory cant Test cantSubfunction Keypad Entry Display Comment Override QzqKeypad Directory Schedule cant Keypad Directory cant Service cord Keypad Directory cant Example 1 Reading Alarm Codes Operationat and Mode Display CodesKeypad Display Local on Cool Alarms Modes Local on M O D EExample 2 Reading Current Operating Modes Keypad Display Comments Entry Response Example 3 Using Test FunctionExample 4 Reading and Changing Chilled Water Set Point CRST2 Example 5 Using Return Water Temperature ResetKeypad Display Comments CrstiExample 6 Changing Reset Type Reset Reference Temperature Outdoor AIR 1OR Space TempEKE Ppiq Keypad Display Entry ResponseFLD CFG Ertyp Lstyp Demand MAX Demand Kimax = Example 8 Setting Time of Day Day of WeekDemand Limiting 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 Compressor Contactor Relay SwitchCGF SNBFig. IOD 24-V Safety Circuit Wiring 225, 250, and 280 Units Electronil c Expansion Valve EXV Page Thermistor and Pressure Transducer Locations Associated Modular Units Refrigerant Temperature Sensor T7, T8 040-210Suction 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 Circuit Circuit B Or2 30GN190-210 3OGT225,250,280 Standard and Accessory Unloaders1NO. of Accessory Accessory Unloader Control Wiring 080-110 SO/SO Hz and 130 60 HzHgbpr TLNModule Contactor Switch Circuit Breaker TransformerLmyTEF4 STAGE2Thermistor ModuleJ7-15 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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