Carrier 48TJE008-014, 48TJD008-014, 48TJF008-012 Parablade Economizer Service Troubleshooting

Page 33

Table 19 Ð PARABLADE Economizer Service Troubleshooting

PROBLEM

CAUSE

 

REMEDY

Damper does not

Evaporator fan not on.

Check wiring between G on connection board and indoor (evaporator)

open.

 

fan contactor.

 

No power to economizer motor.

1.

Disconnect power at TR and TR1. Disconnect jumper across P

 

 

 

and P1.

 

 

2.

Connect jumper across TR and 1.

 

 

3.

Connect jumper across T1 and T.

 

 

4.

If connected, remove enthalpy sensor from terminals So and +.

 

 

 

Factory-installed 620 ohm resistor should be connected to termi-

 

 

5.

nals SR and +.

 

 

Apply power (24 vac) to terminals TR and TR1. The LED should

 

 

 

be off and the damper should be in the closed position.

 

 

6.

Disconnect the factory-installed 620 ohm resistor from terminals

 

 

 

SR and +. The LED should light up and the motor should drive to-

 

 

 

wards open. If this does not happen, replace the economizer con-

 

 

 

trol module.

 

Economizer motor failure.

If the indoor (evaporator) fan and economizer motor are energized,

 

 

verify that there is a minimum of 24 vac at terminals TR and TR1. If

 

 

the motor is not operating, replace the motor.

Economizer opera-

Economizer control module

1.

To simulate high or low enthalpy, reconnect the factory-installed

tion limited to mini-

failure.

 

620 ohm resistor across terminals SR and +.

mum position.

 

2.

Connect 1.2 Kohm checkout resistor across terminals So and +.

 

 

 

Turn the enthalpy set point to ``A.'' The LED should turn on, indi-

 

 

 

cating low enthalpy. The motor should drive towards open. If LED

 

 

 

does not light, replace module. If motor does not drive open, check

 

 

 

motor operation.

 

 

3.

Turn the enthalpy set point to ``D.'' The LED should turn off, indi-

 

 

 

cating high enthalpy. The motor should drive towards closed. If

 

 

 

these actions do not occur, replace module.

 

 

4.

Disconnect 1.2 Kohm checkout resistor before resuming operation.

Damper does not

No power to economizer.

1.

Disconnect power at TR and TR1. Disconnect jumper across P

close.

 

 

and P1.

 

 

2.

Connect jumper across TR and 1.

 

 

3.

Connect jumper across T1 and T.

 

 

4.

If connected, remove enthalpy sensor from terminals So and +.

 

 

 

Factory-installed 620 ohm resistor should be connected to termi-

 

 

5.

nals SR and +.

 

 

Apply power (24 vac) to terminals TR and TR1. The LED should

 

 

 

be off and the damper should be in the closed position.

 

 

6.

Disconnect the factory-installed 620 ohm resistor from terminals

 

 

 

SR and +. The LED should light up and the motor should drive to-

 

 

 

wards open. If this does not happen, replace the economizer con-

 

 

 

trol module.

 

Spring return failure.

If power to unit is off and damper does not close, check for a bound

 

 

linkage. If linkage is not bound, then internal spring may be broken.

 

 

Replace actuator.

 

Economizer motor failure.

If the economizer control module is functioning properly, verify that

 

 

there is a minimum of 24 vac at terminals TR and TR1. If the motor is

 

 

not operating, replace the motor.

Damper does not

Sensor incorrectly wired or bad.

To verify sensor operation, reconnect the + lead of the outdoor en-

open or

 

thalpy sensor to the + terminal of the economizer control module.

close according to

 

Connect a DC milliammeter between terminals So of the economizer

enthalpy

 

control module and terminal S of the enthalpy sensor. The milliamme-

readings.

 

ter should indicate between 3 and 25 mA if the sensor is operating

 

 

properly. If the milliammeter indicates 0, the sensor may be wired

 

 

backwards. If any other readings are shown, replace the sensor.

LEGEND

 

 

 

LED Ð Light-Emitting Diode

 

 

33

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Contents Installation, Start-Up Service Instructions Horizontal Conversion Panels Install External Trap for Condensate``D ALT Drain Hole Accessory Power Control ConnectorUnit Size GAS Connection PackageUnit Leveling Tolerances Physical Data Freeze Protection Thermostat F² Furnace SectionOUTDOOR-AIR Inlet Screens RETURN-AIR FiltersBase Unit Dimensions Flue Hood Details Make Electrical ConnectionsElectrical Data IFC CompsTypical Unit Adjust Factory-Installed OptionsPosition Setting Durablade Economizer Installed in Unit Durablade Economizer Damper Minimum Position Setting Parablade Economizer Installed in Unit Enthalpy Settings for Parablade Economizer Unit Motor Pulley Turns Open Evaporator-Fan Motor Efficiency Economizer Static Pressure Drop in. wgMotor Data Fan Performance, 48TJ008 Ð Vertical Discharge Units Fan Performance, 48TJ009 Ð Vertical Discharge UnitsAirflow Fan Performance, 48TJ014 Ð Vertical Discharge Units Fan Performance, 48TJ012 Ð Vertical Discharge UnitsFan Performance, 48TJ009 Ð Horizontal Discharge Units Fan Performance, 48TJ008 Ð Horizontal Discharge UnitsFan Performance, 48TJ014 Ð Horizontal Discharge Units Fan Performance, 48TJ012 Ð Horizontal Discharge UnitsHeating START-UPAltitude Compensation Nominal InputElevation Lubrication Cleaning Condenser CoilCondenser-Fan Adjustment Fig 48TJ Unit VoltageFAN Height ``A Cooling Charging Chart 48TJ009 LED Indication Error Code Description LED Error Code DescriptionOFF Flash²Burner Section Details Spark Gap Adjustment LED Error Code Service Analysis Problem Cause RemedyLED OFF Problem Cause Remedy Durablade Economizer TroubleshootingParablade Economizer Service Troubleshooting Cooling Service Troubleshooting Heating Service Troubleshooting Typical Wiring Schematic and Component Arrangement Page Copyright 1996 Carrier Corporation Page Preliminary Information Remove and Store in Job File

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