Bryant 581A EconoMi$er IV Troubleshooting Completion, EconoMi$er IV Input/Output Logic

Page 51

4.Remove the jumper across T and T1. The actuator should drive fully closed.

5.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

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. 44 — EconoMi$er IV Functional View

51

Image 51
Contents Contents Safety ConsiderationsInstallation Provide Unit Support III. RIG and Place Unit II. Remove Shipping RailsRoof Curb Details Shipping Rail Removal Base Unit Dimensions Compressor Physical DataFan Motor and Drive Data Vertical Supply/Return Fan Motor and Drive Data Horizontal Supply/Return Horizontal Applications Vertical ConfigurationIV. Field Fabricate Ductwork Make Unit Duct ConnectionsVI. Install Flue Hood and Inlet Hood VIII. Install GAS PipingVII. Trap Condensate Drain Field Power Supply Field Control WiringIX. Make Electrical Connections Manual Damper Assembly Install OUTDOOR-AIR HoodFLA MCA Mocp Electrical Data Units Without Convenience OutletElectrical Data Units With Optional Convenience Outlet Outdoor-Air Hood Details XII. NON-FUSED Disconnect XIII. Install ALL AccessoriesSTART-UP III. Refrigerant Service PortsVI. Internal Wiring PRE-START-UPXI. GAS Heat VIII. Condenser Fans and MotorsIX. RETURN-AIR Filters OUTDOOR-AIR Inlet ScreensFan Performance 581A210 Medium Heat Vertical Discharge Units Fan Performance 581A240 Low Heat Vertical Discharge Units Fan Performance 581A210 High Heat Vertical Discharge UnitsFan Performance 581A240 High Heat Vertical Discharge Units Fan Performance 581A240 Medium Heat Vertical Discharge UnitsFan Performance 581A300 Medium Heat Vertical Discharge Units Fan Performance 581A300 Low Heat Vertical Discharge UnitsGeneral Notes for Tables Fan Performance 581A300 High Heat Vertical Discharge UnitsFan Performance 581A210 Low Heat Horizontal Discharge Units Fan Performance 581A240 Low Heat Horizontal Discharge Units Fan Performance 581A210 High Heat Horizontal Discharge UnitsFan Performance 581A240 High Heat Horizontal Discharge Units Fan Performance 581A300 Low Heat Horizontal Discharge Units Fan Performance 581A300 High Heat Horizontal Discharge Units Power Exhaust Fan PerformanceOperation Air Quantity Limits Evaporator Fan Motor SpecificationsXII. Optional ECONOMI$ER Accessory/FIOP Static Pressure in. wgFan Rpm at Motor Pulley Settings EconoMi$er IV Controller Wiring and Operational ModesEconoMi$er IV Component Locations Exploded View Supply-Air Temperature Sensor LocationEconoMi$er IV Wiring Enthalpy Changeover Set Points Page CO2 Sensor Standard Settings XII. Operating SequenceCooling, Units Without Economizer Cooling, Units With EconoMi$er Service CleaningCoil Maintenance and Cleaning Recommendation Heating, Units Without EconomizerMain Burner Condensate DrainFilters Outdoor-Air Inlet ScreensII. Lubrication III. Evaporator FAN Service and ReplacementVI. CONDENSER-FAN Adjustment Fig IV. Evaporator FAN Performance AdjustmentBelt Tension Adjustment Belt Tension AdjustmentVII. Power Failure IX. GAS Valve AdjustmentVIII. Refrigerant Charge Main Burners XI. Filter DrierXII. Protective Devices XV. Replacement Parts XIII. Relief DevicesXIV. Control Circuit Low Voltage Control Schematic Low Voltage Control Schematic Power Schematic Component Arrangement Cooling Service Analysis Troubleshooting Unit TroubleshootingProblem Cause Remedy Heating Service AnalysisIGC Control Heating and Cooling II. ECONOMI$ER IV Troubleshooting EconoMi$er IV Input/Output Logic EconoMi$er IV Troubleshooting CompletionCopyright 2005 Bryant Heating & Cooling Systems Catalog no Page Page Page Pressures START-UP ChecklistTemperatures Electrical
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