Carrier GT-G Unit Operation, Diagnostic Features, CXM Control Start-up Operation, Stat signal

Page 44

Carrier

CXM Controls

 

 

Diagnostic Features

The LED on the CXM board advises the technician of the current status of the CXM control. The LED can display either the current CXM mode or the last fault in memory if in test mode. If there is no fault in memory, the LED will flash Code 1 (when in test mode).

CXM Control Start-up Operation

The control will not operate until all inputs and safety controls are checked for normal conditions. The compressor will have a 5 minute anti-short cycle delay at power-up. The first time after power-up that there is a call for compressor, the compressor will follow a 5 to 80 second random start delay. After the random start delay and anti-short cycle delay, the compressor relay will be energized. On all subsequent compressor calls, the random start delay is omitted.

Unit Operation

 

 

 

 

 

 

 

 

 

 

 

 

GT-PX

 

 

GT-GS / GT-S

 

 

GT-GS / GT-S

 

T-stat signal

 

 

 

 

 

 

 

 

 

 

Variable Speed

 

Variable Speed

 

PSC Air Handler

 

 

Air Handler

 

Air Handler

 

 

 

G

 

Fan only

 

Fan only

 

Fan only

G, Y or Y1

 

Stage 1 heating1

 

Stage 1 heating3

 

Stage 1 heating5

G, Y1, Y2

 

Stage 2 heating1

 

Stage 2 heating3

 

Stage 2 heating5

G, Y1, Y2, W

 

Stage 3 heating1

 

Stage 3 heating3

 

N/A

G, W

 

Emergency heat

 

Emergency heat

 

Emergency heat

 

 

 

 

 

 

 

 

 

 

G, Y or Y1, O

 

Stage 1 cooling2

 

Stage 1 cooling4

 

Cooling6

G, Y1, Y2, O

 

Stage 2 cooling2

 

Stage 2 cooling4

 

N/A

1Stage 1 = 1st stage compressor, 1st stage fan operation Stage 2 = 2nd stage compressor, 2nd stage fan operation Stage 3 = 2nd stage compressor, auxiliary electric heat, 2nd or 3rd stage fan operation (depending on fan settings)

2Stage 1 = 1st stage compressor, 1st stage fan operation, reversing valve Stage 2 = 2nd stage compressor, 2nd stage fan operation, reversing valve

3Stage 1 = compressor, 1st stage fan operation Stage 2 = compressor, 2nd stage fan operation

Stage 3 = compressor, auxiliary electric heat, 2nd or 3rd stage fan operation (depending on fan settings)

4Stage 1 = compressor, 1st stage fan operation, reversing valve Stage 2 = compressor, 2nd stage fan operation, reversing valve

5Stage 1 = compressor, fan

Stage 2 = compressor, auxiliary electric heat, fan

6Cooling = compressor, fan, reversing valve

42

Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05

Page 43 Page 45
Image 44
Page 43 Page 45
Contents Geothermal Split Systems Carrier Page Table of Contents Geothermal Advantages Highest EfficiencyMaximum Comfort Environmentally FriendlyClosed Loop Systems Ground Water SystemsRounding Out the Product Line Puron RefrigerantOther New Features Service AdvantagesApplication Flexibility Factory QualityOptions & Accessories Features and Benefits GT-GS Operating EfficienciesSingle-Stage Indoor Split R22 Systems GT-S Concept What is the GT-S?Why Paradigm Shift? Typical GT-S / Air Handler Installation Typical GT-S / Add-on Coil InstallationInternally-mounted field installed Flow Controller Copeland Scroll Compressor Rotary GT-PX 50YDS Performance Data English IP Units GT-PX 50YDS Performance Data Metric SI UnitsGT-GS 50YCS & GT-S 38WQS Performance Data English IP Units GT-GS 50YCS & GT-S 38WQS Performance Data Metric SI Units38WQS Nomenclature Model NomenclatureCooling GT-GS & GT-S Performance Correction FactorsAirflow Correction Factors Entering Air Correction Factors50YDS026 Part Load With FV4003 PSI EER HWC LAT COP50YDS026 Full Load With FV4003 EER HWC LAT COP50YDS038 Part Load With FV4005 50YDS038 Full Load With FV4005 PSI EER HWC LAT COP50YDS049 Part Load With FV4006 GT-PX 50YDS049 Full Load With FV400650YDS064 Part Load With FV4006 50YDS064 Full Load With FV4006 50YCS018 / 38WQS018 With GAH018 Cooling EAT 80/67 FCarrier 50YCS024 / 38WQS024 With GAH02450YCS030 / 38WQS030 With GAH030 EWT F GPM CFM PSI LAT COP HWC EER50YCS036 / 38WQS036 With GAH036 CFM PSI LAT COP HWC EER50YCS042 / 38WQS042 With GAH042 11050YCS048 / 38WQS048 With GAH048 50YCS060 / 38WQS060 With GAH060 2000 53.6GT-S 38WQS Physical Data GT-PX 50YDS Physical DataGT-GS 50YCS Physical Data GT-PX Dimensional Data GT-PX 50YDS Dimensional DataGT-GS Dimensional Data GT-GS 50YCS Dimensional DataGT-S Dimensional Data GT-S 38WQS Dimensional DataElectrical Data GT-PX 50YDS Electrical DataGT-GS 50YCS Electrical Data GT-S 38WQS Electrical DataThermostat Wiring Typical Thermostat Wiring, Two-Stage Units 3 Heat / 2 CoolTypical Thermostat Wiring Infinity / Evolution Controls Thermostat InstallationCXM LED And Alarm Relay Operations CXM ControlsSafety Features CXM Control CXM ControlsDiagnostic Features Stat signalUnit Operation CXM Control Start-up OperationGT-PX Split Wiring Diagram GT-GS Split Wiring Diagram GT-S Split Wiring Diagram Equipment Selection General22 Air Handler Characteristics Equipment SelectionSelecting Air Handler Air Handler Selection ExampleGT-PX Split 50YDS Series Casing & CabinetRefrigerant Circuit ElectricalGT-GS GT-S Outdoor Split 38WQS Series Thermostat field installed Flow Controller field installedHose Kits field installed GT-PX & GT-GS only Cooling TXV Kit field installed R-22 GT-GS & GT-S units onlyPage 7300 S.W th Street Oklahoma City, OK Phone Fax
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