Bryant 548D Damper does not open, EconoMi$er operation limited, To minimum position

Page 36

Table 16 — EconoMi$er Troubleshooting

PROBLEM

CAUSE

REMEDY

Damper does not open.

Indoor Fan is Off.

Check to ensure that 24 vac is present at Terminal C1 (Common Power)

 

 

on the IFC (Indoor Fan contactor) or that 24 vac is present at

 

 

the IFO (Indoor Fan On) terminal. Check whether 24 vac is

 

 

present at PL (Plug) 6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is

 

 

not present, check wiring (see unit label diagram).

 

 

Check proper thermostat connection to G on the connection board.

 

No power to EconoMi$er

Check to ensure that 24 vac is present across Terminals 24 VAC and

 

controller.

24V COM on the EconoMi$er control. If 24 vac is not present, check

 

 

wiring (see unit label diagram). If 24 vac is present, STATUS light should

 

 

be on constantly.

 

No power to G Terminal.

If IFM is on, check to ensure 24 vac is present on G Terminal of the

 

 

EconoMi$er controller. If 24 vac is not present, check wiring (see unit

 

 

label diagram).

 

Controller fault.

If STATUS light is flashing one flash, the EconoMi$er controller is

 

 

experiencing a fault condition. Cycle power to the controller. If condition

 

 

continues, replace the EconoMi$er controller.

 

Thermostat fault.

If STATUS light is flashing two flashes, the EconoMi$er controller senses

 

 

the thermostat is wired incorrectly. Check wiring between the thermostat

 

 

and the connection board in the electrical panel. The fault condition is

 

 

caused by Y2 being energized before Y1.

 

Actuator Fault.

Check the wiring between the EconoMi$er controller and the actuator.

 

 

Hold CONFIG button between three and ten seconds to verify the

 

 

actuator’s operation. (This process takes three minutes to complete.)

EconoMi$er operation limited

Minimum position set

Verify that the MIN POS (%) is set greater than zero. Adjust

to minimum position.

incorrectly.

MIN POS (%) to 100% to verify operation, and then set to correct setting.

 

EconoMi$er changeover

Set at correct value. See Table 4.

 

set point set too high or

 

 

too low.

 

 

Supply air temperature

If STATUS light is flashing 4 flashes, the supply air temperature sensor is faulty.

 

sensor faulty.

Check wiring or replace sensor.

 

Outdoor air temperature sen-

If STATUS light is flashing 5 flashes, the outdoor-air temperature sensor is faulty.

 

sor faulty.

Check wiring or replace sensor.

Damper position

Supply air low limit

The supply air temperature is less than 45 F, causing the minimum

less than minimum

strategy controlling.

position to decrease. Refer to the Start-Up instructions. Verify correct

position set point.

 

setting of MIN POS (%). If correct, EconoMi$er is operating correctly.

Damper does not return to

CO2 ventilation strategy

If a CO2 sensor is being used, and the damper position is greater than

minimum position.

controlling.

minimum position, the ventilation control strategy is controlling. Refer to

 

 

the Start-Up instructions. EconoMi$er is operating correctly.

Damper does not close on

Damper travel is

Check to ensure the damper is not blocked.

power loss

restricted.

 

LEGEND

IFM — Indoor-Fan Motor

OAT — Outdoor-Air Temperature

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Contents Contents Safety ConsiderationsInstallation Provide Unit SupportRoof Curb Details III. Install Condensate Drain Line and External Trap II. Field Fabricate DuctworkIV. RIG and Place Unit PositioningUnit MAX Dimensions Weight Base Unit Dimensions Physical Data Unit Size 548DField Power Supply Make Electrical Connections575-3-60 460-3-60Electrical Data Units Without Electrical Convenience Outlet SIZE†Type RLA LRA FLAElectrical Data Units With Electrical Convenience Outlet Min81/2 Tons FLA VI. Adjust FACTORY-INSTALLED Options Unit Voltage 208/230 460 575Stage Durablade Economizer Installation Durablade Economizer Damper Minimum Position Setting EconoMi$er Component Locations Rear EconoMi$er Flange Installation EconoMi$er Wiring Wiring Diagram for Power Exhaust System Default Potentiometer Settings VII. Adjust INDOOR-FAN SpeedChangeover Set Points Typical Belt-Drive Motor Mounting for Size Fan Rpm at Motor Pulley Settings Indoor-Fan Motor PerformanceUnit INDOOR-FAN Maximum Acceptable Continuous BHPFan Performance 548D090 Vertical Discharge Units Standard Motor Belt DriveFan Performance 548D102 Vertical Discharge Units Fan Performance 548D120 Vertical Discharge Units 548D120 10 Tons Standard and Alternate Motors Belt DriveFan Performance 548D090 Horizontal Discharge Units Fan Performance 548D102 Horizontal Discharge Units Fan Performance 548D120 Horizontal Discharge Units Standard and Alternate Motors Belt DriveInternal Wiring VI. Refrigerant Service PortsPRE-START-UP START-UP Unit PreparationIX. Adjust GAS Input XII. Safety ReliefCooling XI. HeatingService Cleaning Cooling, Units With EconoMi$erDefrost Indoor CoilII. Lubrication IV. Economizer Adjustment Refrigerant ChargeCooling Charging Chart 548D102 Troubleshooting Heating and Cooling TroubleshootingProblem Cause Remedy Durablade Economizer Troubleshooting IFCIFO OATDamper does not open EconoMi$er operation limitedTo minimum position Damper positionTypical Wiring Diagram Must Voltage Page START-UP Checklist TemperaturesPreliminary Information III. START-UP Electrical

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