Bryant 581B EconoMi$er IV Troubleshooting Completion, EconoMi$er IV Input/Output Logic, Terminal†

Page 49

G. EconoMi$er IV Troubleshooting Completion

This procedure is used to return the EconoMi$er IV to opera- tion. No troubleshooting or testing is done by performing the following procedure.

1.Disconnect power at TR and TR1.

2.Set enthalpy potentiometer to previous setting.

3.Set DCV maximum position potentiometer to previ- ous setting.

4.Set minimum position, DCV set point, and exhaust potentiometers to previous settings.

5.Remove 620-ohm resistor from terminals SR and +.

6.Remove 1.2 kilo-ohm checkout resistor from termi- nals SO and +. If used, reconnect sensor from termi- nals SO and +.

7.Remove jumper from TR to N.

8.Remove jumper from TR to 1.

9.Remove 5.6 kilo-ohm resistor from T and T1. Recon- nect wires at T and T1.

10.Remove jumper from P to P1. Reconnect device at P and P1.

11.Apply power (24 vac) to terminals TR and TR1.

Table 37 — EconoMi$er IV Input/Output Logic

 

INPUTS

 

 

 

 

 

OUTPUTS

 

Demand Control

Enthalpy*

 

 

 

Compressor

N Terminal†

 

 

Y1

Y2

Stage

Stage

Occupied

Unoccupied

Ventilation (DCV)

Outdoor

Return

 

 

1

2

Damper

 

 

 

 

 

Below set

High

Low

On

On

On

On

Minimum position

Closed

(DCV LED Off)

(Free Cooling LED Off)

 

On

Off

On

Off

 

 

 

 

 

 

 

 

 

 

Off

Off

Off

Off

 

 

 

Low

High

On

On

On

Off

Modulating** (between min.

Modulating** (between

 

(Free Cooling LED On)

 

On

Off

Off

Off

position and full-open)

closed and full-open)

 

 

 

 

 

 

 

 

Off

Off

Off

Off

Minimum position

Closed

Above set

High

Low

On

On

On

On

Modulating†† (between min.

Modulating†† (between

(DCV LED On)

(Free Cooling LED Off)

 

On

Off

On

Off

position and DCV maximum)

closed and DCV

 

 

 

 

maximum)

 

 

 

Off

Off

Off

Off

 

 

 

 

 

 

 

Low

High

On

On

On

Off

Modulating***

Modulating†††

 

(Free Cooling LED On)

 

On

Off

Off

Off

 

 

 

 

 

 

 

 

 

 

Off

Off

Off

Off

 

 

*For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.

†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).

**Modulation is based on the supply-air sensor signal. ††Modulation is based on the DCV signal.

***Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (supply-air signal).

†††Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-air signal).

Fig. 60 — EconoMi$er IV Functional View

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Contents Safety Considerations ContentsInstallation Provide Unit SupportIII. Determine Location of Drain Line and External Trap II. Field Fabricate DuctworkCRBTMPWR001A01 Roof Curb Unit Size Accessory CRRFCURB001A01CRBTMPWR002A01 CRBTMPWR003A01VI. Install GAS Piping Install Flue HoodIV. RIG and Place Unit Positioning581B 036 Unit Operating Weight048 060Physical Data 581B036-072 Furnace Section LOSS-OF-CHARGE SWITCH/LOW-PRESSUREFreeze Protection Thermostat OUTDOOR-AIR Inlet ScreensBase Unit Dimensions 581B036-072 Field Control Wiring Field Power SupplyHeat Anticipator Settings Steel Pipe Spacing of Supports Nominal Diameter DimensionLow-Voltage Connections With or Without Economizer Power Wiring ConnectionsFAN Motor Power Exhaust MCA MocpDisconnect SIZE† RLA LRA FLA MCA MocpFAN Motor Supply SIZE†Disconnect Switch VIII. Adjust FACTORY-INSTALLED OptionsPerfect Humidity Dehumidification System LPSManual Outdoor-Air Damper Damper Panel with Manual Outdoor-Air Damper InstalledOptional Manual Outdoor-Air Damper With Hood Attached EconoMi$er IV Standard Sensors Indoor Coil Access Panel RelocationBarometric Flow Capacity EconoMi$er IV Control Modes Supply Air Sensor Temperature/Resistance ValuesEconoMi$er IV Sensor Usage Return Air Temperature or Enthalpy Sensor Mounting Location Enthalpy Changeover Set Points Page 581B Fan Rpm at Motor Pulley Setting With Standard Motor IX. Adjust EVAPORATOR-FAN Speed581B Fan Rpm at Motor Pulley Setting With High-Static Motor Unit Maximum Unit Voltage Phase Continuous BHP581B AMP DrawOutdoor Sound Power Total Unit Accessory/FIOP EconoMi$er IV Static Pressure* in. wgEvaporator-Fan Motor Data High-Static Motors 1265 1294 1175 1346 1275 1400 1147 9721320 1310 1371 1419 1500 1175 1086 1292670 666 257 778 367 871 471 952 572701 306 810 426 901 540 981 651 7601803 16491470 1784 19671008 643 967 563805 1049 731782 316 870 417 948 Rpm Bhp Watts 900 553 1341000 582 163 807 358 894 466 971675 277 643 234 762707 326 740 382839 412 938 505 1030 605 800 350 904 438 999 535879 483 974 580 919 561753 800 350 904 438 999 535 1087 640839 412 938 505 1030 605 1115 714 829General FAN Performance Notes VII. Refrigerant Service Ports VI. Internal WiringPRE-START-UP START-UP Unit PreparationXI. Main Burners CoolingXII. Heating XV. Operating Sequence XIII. Safety ReliefThermostat Input Economizer Function 581B Unit Operation Perfect Humidity Normal Design Cooling OperationIV. ECONOMI$ER IV Adjustment Service CleaningVI. HIGH-PRESSURE Switch VII. LOSS-OF-CHARGE SwitchLow Charge Cooling To Use Cooling Charging Chart, Standard UnitPerfect Humidity System Charging Unit 581BCooling Charging Chart, Standard 581B036 Condenser FAN Must be Operating XV. Replacement Parts XII. Limit SwitchFlue GAS Passageways XI. COMBUSTION-AIR BlowerMedium High Heat Units LOW Heat UnitsOLR CAPCLO CompLED Error Code Service Analysis Troubleshooting Unit TroubleshootingSymptom Cause Remedy LED OFFProblem Cause Remedy Heating Service AnalysisProblem Cause Remedy Cooling Service AnalysisII. ECONOMI$ER IV Troubleshooting EconoMi$er IV Input/Output Logic EconoMi$er IV Troubleshooting CompletionInputs Outputs Demand Control EnthalpyIndex Page Temperatures START-UP ChecklistPreliminary Information III. START-UP Electrical
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