Orion-system MODGAS-XWR Manual do Utilizador descarregar pdf (Página 22)

TROUBLESHOOTING

MODGAS-XWR Technical Guide

Troubleshooting Alarms

Mechanical Failure:

• Check relay outputs on the MODGAS-XWR for 24

VAC output.

• Verify the SAT OPTIONS jumper settings on the

MODGAS-XWR for Supply Air Temperature Sensor.

• Verify gas valve LED is solid. Try forcing valves (refer

to Force Screens in this guide).

• Verify that the Supply Air Temperature Sensor is

connected to SAT and GND on the MODGAS-XWR

(stand-alone mode) or to AI2 and GND on the Main

Controller (communicating mode).

• Verify Supply Air Temperature Sensor probe is

mounted correctly in supply duct.

• Remove SAT and GND wiring from the MODGAS-

XWR and ohm sensor out (this may indicate open or

failed wiring). Refer to chart in back of this guide for

readings.

Supply Air Temperature Failure:

• Verify that the Supply Air Temperature Sensor is

connected to the SAT and GND on the MODGAS-

XWR (stand-alone mode) or to AI2 and GND on the

Main Controller (communicating mode).

• Remove SAT and GND wiring from MODGAS-XWR

and ohm sensor out (this may indicate open or failed

wiring). Refer to chart in back of this guide for

readings.

• Verify the SAT OPTIONS jumper settings on the

MODGAS-XWR for the Supply Air Temperature

Sensor.

SAT Cutoff Mode:

• Remove SAT and GND wiring from the MODGAS-

XWR and ohm sensor out (this may indicate open or

failed wiring). Refer to chart in back of guide for

readings.

• With Supply Air Sensor disconnected from the

MODGAS-XWR, set volt meter to DC volts and

measure voltage between SAT and GND on board.

Refer to chart in back of this guide for readings.

• Verify Supply Air Temperature Sensor reading in duct

with 3rd party temperature testing device.

Communications Loss:

• Check COMM LED on MODGAS-XWR.

• Verify 24 VAC power to all interconnected WattMaster

controllers.

• Verify E-BUS connection between the MODGAS-

XWR and associated WattMaster controllers.

• In communication mode (connected to an AAON unit

Controller with modular cable), conﬁ rm that Main

MODGAS screens shows COMM MODE that Main

Controller’s MODGAS status screen displays

MODGAS-XWR’s Position %.

Troubleshooting Alarms

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