Bryant 581A operation manual II. ECONOMI$ER IV Troubleshooting

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II.ECONOMI$ER IV TROUBLESHOOTING

See Table 37 for EconoMi$er IV logic.

A functional view of the EconoMi$er IV is shown in Fig. 44. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is avail- able from Bryant to help with EconoMi$er IV training and troubleshooting.

A. EconoMi$er IV Preparation

This procedure is used to prepare the EconoMi$er IV for troubleshooting. No troubleshooting or testing is done by performing the following procedure.

NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm resistor, and a 5.6 kilo-ohm resistor which are not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.

1.Disconnect power at TR and TR1. All LEDs should be off. Exhaust fan contacts should be open.

2.Disconnect device at P and P1.

3.Jumper P to P1.

4.Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor across T and T1.

5.Jumper TR to 1.

6.Jumper TR to N.

7.If connected, remove sensor from terminals SO and +. Connect 1.2 kilo-ohm 4074EJM checkout resistor across terminals SO and +.

8.Put 620-ohm resistor across terminals SR and +.

9.Set minimum position, DCV set point, and exhaust potentiometers fully CCW (counterclockwise).

10.Set DCV maximum position potentiometer fully CW (clockwise).

11.Set enthalpy potentiometer to D.

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

B. Differential Enthalpy

To check differential enthalpy:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Place 620-ohm resistor across SO and +.

3.Place 1.2 kilo-ohm resistor across SR and +. The Free Cool LED should be lit.

4.Remove 620-ohm resistor across SO and +. The Free Cool LED should turn off.

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

C.Single Enthalpy

To check single enthalpy:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Set the enthalpy potentiometer to A (fully CCW). The Free Cool LED should be lit.

3.Set the enthalpy potentiometer to D (fully CW). The Free Cool LED should turn off.

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

D. DCV (Demand Controlled Ventilation) and Power Exhaust

To check DCV and Power Exhaust:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuator should be fully closed.

3.Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The LED for both DCV and Exhaust should turn on. The actuator should drive to between 90 and 95% open.

4.Turn the Exhaust potentiometer CW until the Exhaust LED turns off. The LED should turn off when the potentiometer is approximately 90%. The actuator should remain in position.

5.Turn the DCV set point potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9 v. The actuator should drive fully closed.

6.Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on. The exhaust con- tacts will close 30 to 120 seconds after the Exhaust LED turns on.

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

E.DCV Minimum and Maximum Position

To check the DCV minimum and maximum position:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The DCV LED should turn on. The actuator should drive to between 90 and 95% open.

3.Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

4.Turn the DCV Maximum Position potentiometer to fully CCW. The actuator should drive fully closed.

5.Turn the Minimum Position potentiometer to mid- point. The actuator should drive to between 20 and 80% open.

6.Turn the Minimum Position Potentiometer fully CW. The actuator should drive fully open.

7.Remove the jumper from TR and N. The actuator should drive fully closed.

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

F.Supply-Air Input

To check supply-air input:

1.Make sure EconoMi$er IV preparation procedure has been performed.

2.Set the Enthalpy potentiometer to A. The Free Cool LED turns on. The actuator should drive to between 20 and 80% open.

3.Remove the 5.6 kilo-ohm resistor and jumper T to T1. The actuator should drive fully open.

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Contents Installation Provide Unit Support ContentsSafety Considerations II. Remove Shipping Rails III. RIG and Place UnitRoof Curb Details Shipping Rail Removal Base Unit Dimensions Physical Data CompressorFan Motor and Drive Data Vertical Supply/Return Fan Motor and Drive Data Horizontal Supply/Return Make Unit Duct Connections Vertical ConfigurationIV. Field Fabricate Ductwork Horizontal ApplicationsVII. Trap Condensate Drain VI. Install Flue Hood and Inlet HoodVIII. Install GAS Piping IX. Make Electrical Connections Field Power SupplyField Control Wiring Install OUTDOOR-AIR Hood Manual Damper AssemblyElectrical Data Units Without Convenience Outlet FLA MCA MocpElectrical Data Units With Optional Convenience Outlet Outdoor-Air Hood Details XIII. Install ALL Accessories XII. NON-FUSED DisconnectPRE-START-UP III. Refrigerant Service PortsVI. Internal Wiring START-UPOUTDOOR-AIR Inlet Screens VIII. Condenser Fans and MotorsIX. RETURN-AIR Filters XI. GAS HeatFan Performance 581A210 Medium Heat Vertical Discharge Units Fan Performance 581A210 High Heat Vertical Discharge Units Fan Performance 581A240 Low Heat Vertical Discharge UnitsFan Performance 581A240 Medium Heat Vertical Discharge Units Fan Performance 581A240 High Heat Vertical Discharge UnitsFan Performance 581A300 Low Heat Vertical Discharge Units Fan Performance 581A300 Medium Heat Vertical Discharge UnitsFan Performance 581A300 High Heat Vertical Discharge Units General Notes for TablesFan Performance 581A210 Low Heat Horizontal Discharge Units Fan Performance 581A210 High Heat Horizontal Discharge Units Fan Performance 581A240 Low Heat Horizontal Discharge UnitsFan Performance 581A240 High Heat Horizontal Discharge Units Fan Performance 581A300 Low Heat Horizontal Discharge Units Power Exhaust Fan Performance Fan Performance 581A300 High Heat Horizontal Discharge UnitsEvaporator Fan Motor Specifications Operation Air Quantity LimitsEconoMi$er IV Controller Wiring and Operational Modes Accessory/FIOP Static Pressure in. wgFan Rpm at Motor Pulley Settings XII. Optional ECONOMI$ERSupply-Air Temperature Sensor Location EconoMi$er IV Component Locations Exploded ViewEconoMi$er IV Wiring Enthalpy Changeover Set Points Page Cooling, Units Without Economizer CO2 Sensor Standard SettingsXII. Operating Sequence Heating, Units Without Economizer Service CleaningCoil Maintenance and Cleaning Recommendation Cooling, Units With EconoMi$erOutdoor-Air Inlet Screens Condensate DrainFilters Main BurnerIII. Evaporator FAN Service and Replacement II. LubricationBelt Tension Adjustment IV. Evaporator FAN Performance AdjustmentBelt Tension Adjustment VI. CONDENSER-FAN Adjustment FigVIII. Refrigerant Charge VII. Power FailureIX. GAS Valve Adjustment XII. Protective Devices Main BurnersXI. Filter Drier XIV. Control Circuit XV. Replacement PartsXIII. Relief Devices Low Voltage Control Schematic Low Voltage Control Schematic Power Schematic Component Arrangement Troubleshooting Unit Troubleshooting Cooling Service AnalysisHeating Service Analysis Problem Cause RemedyIGC Control Heating and Cooling II. ECONOMI$ER IV Troubleshooting EconoMi$er IV Troubleshooting Completion EconoMi$er IV Input/Output LogicCopyright 2005 Bryant Heating & Cooling Systems Catalog no Page Page Page Electrical START-UP ChecklistTemperatures Pressures
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581A specifications

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