Table 21 Ð PARABLADE Economizer Troubleshooting

PROBLEM

CAUSE

 

REMEDY

Damper does not

Evaporator fan not on.

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

open.

 

contactor.

 

No power to economizer

1.

Disconnect power at TR and TR1. Disconnect jumper across P and P1.

 

motor.

2.

Connect jumper across TR and 1.

 

 

3.

Connect jumper across T1 and T.

 

 

4.

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

 

 

5.

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 towards open. If this

 

 

 

does not happen, replace the economizer control 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 oper-

 

 

ating, replace the motor.

Economizer op-

Economizer control module

1.

To simulate high or low enthalpy, reconnect the factory-installed 620 ohm

eration limited to

failure.

 

resistor across terminals SR and +.

minimum position.

 

2.

Connect 1.2 Kohm checkout resistor across terminals SO and +. Turn the

 

 

 

enthalpy set point to ``A.'' The LED should turn on, indicating 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, indicating high

 

 

 

enthalpy. The motor should drive towards closed. If these actions do not oc-

 

 

 

cur, 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 and P1.

close.

 

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-

 

 

5.

installed 620 ohm resistor should be connected to terminals 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 towards open. If this

 

 

 

does not happen, replace the economizer control 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, re-

 

 

place the motor.

Damper does not

Sensor incorrectly wired or

To verify sensor operation, reconnect the + lead of the outdoor enthalpy sensor

open or close

bad.

to the + terminal of the economizer control module. Connect a DC milliammeter

according to

 

between terminals SO of the economizer control module and terminals S of the

enthalpy readings.

 

enthalpy sensor. The milliammeter 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.

LED Ð Light-Emitting Diode

 

 

Ð34Ð

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Bryant 558D installation instructions Parablade Economizer Troubleshooting, Enthalpy readings
Page 33 Page 35

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