Carrier 040-420 Condenser Fan Sequence, FAN Arrangement FAN Numbers Contactor Controlled

Page 26

Head Pressure Control - The microprocessor con- trols the condenser fans in order to maintain the lowest con- densing temperature possible, thus the highest unit efficiency. Instead of using the conventional head pressure control meth- ods, the fans are controlled by the position of the EXV and suction superheat.

As the condensing temperature drops, the EXV opens to maintain the proper suction superheat. Once the EXV is fully open, if the condensing temperature continues to drop, the suction superheat begins to rise. Once the suction super- heat is greater than 40 F (22.2 C), a fan stage is removed after 2 minutes,

As the condensing temperature rises, the EXV closes to maintain the proper suction superheat. Once the EXV has closed to 39.5% open (300 steps open), a fan stage is added after 2 minutes.

During start-up, all the condenser fans are started when the condensing temperature reaches 95 F (35 C) to prevent excessive discharge pressure during pulldown. See Table 5 for condenser fan sequence of operation.

Table 5 - Condenser Fan Sequence

FAN ARRANGEMENT

FAN NUMBER(S)

FAN

CONTACTOR

CONTROLLED

BY

WI

1

FC-Al

Compressor

Al

30GN040-050

I

2

FC-Bi

Compressor

Bl

3

FC-A2

First Stage

Microprocessor

4

FGB2

Second

Stage

I

MicrODrOceSSOr

30GN060,070

FC-Al

I

Compressor

Al

Compressor

Bi

First Stage

Microprocessor

5 6

FGB2

Second

Stage

Microprocessor

30GN080,090

FC-Al

Compressor

Al

Compressor

Bi

30GNl00,110

(and associated modular units)

1

FC-Al

Compressor

Al

2

FC - 81

Compressor

Bl

3

FC - A2

First Stage

4

F&B2

Microprocessor

5,

7, 6,

8

FC-AS, FGB3

Second

Stage

Compressor

.

-_----

3, 4, 5, 6, 7, a

FC-A2, FC-A3,

Third

Stage

FGB2,

FC-B3

Microprocessor

30GN130 170

(and associated modular units)

5 7

FC-Al

Compressor

Al

WWER

6, 8

FC-Bl

Compressor

Bl

FC-A2, FC-A3

30GN190,210

(and associated modular units)

5, 7

I

FC-Al

Compressor

Al

I

6. 8

I

FC-Bi

Comwessor

Bl

3, 9

FC-A2

Frist

Stage

4, 10

FC-B2

Microprocessor

1 , 3, 9, 11

FC-A2,

FGA3

Second

Stage

2, 4, 10,

12

FGB2,

FC-B3

Microprocessor

*Control

box.

26

Image 26

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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