Orion-system PREHEAT-X Manuel d'utilisateur télécharger pdf (Page 22)

TROUBLESHOOTING

PREHEAT-X Technical Guide

Troubleshooting Alarms

Mechanical Failure:

• Check relay outputs on the PREHEAT-X for 24 VAC

output.

• Verify output voltage (VOUT and GND) to SCR or

PWM

• Verify that the Leaving Air Temperature Sensor(s) is

connected to AIN1 and/or AIN2 and GND on the

PREHEAT-X

• Verify Leaving Air Temperature Sensor probe(s) is

mounted correctly

• Remove AIN1 and AIN2 and GND wiring from the

PREHEAT-X and ohm the sensor out (this may

indicate open or failed wiring). Refer to chart in back

of this guide for readings.

Leaving Air Temperature Failure:

• Verify that the Leaving Air Temperature Sensor(s) is

connected to the AIN1 and/or AIN2 and GND on the

PREHEAT-X.

• Remove AIN1 and AIN2 and GND wiring from the

PREHEAT-X and ohm the sensor out (this may

indicate open or failed wiring). Refer to chart in back

of this guide for readings.

Alarms & LED Locations

Communications Loss:

• Check COMM LED on PREHEAT-X.

• Verify 24 VAC power to all interconnected

WattMaster controllers.

• Verify connection between the PREHEAT-X

and associated WattMaster controllers.

• In communication mode (connected to a an AAON

Unit with modular cable), verify PREHEAT-X

conﬁ guration on AAON unit.

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Orion-system PREHEAT-X Manuel d'utilisateur Page 22