The controller receives a normally closed signal (can be changed to normally open at SFT under D Menu or Manufacturer Menu – C2a) from the smoke/fire detector on terminal 41 and 5. When the controller receives an active smoke/fire alarm, all components on both units will shut to minimize airflow within the site: outside air damper, heater, compressor, and supply fan. This alarm is reset automatically when alarm is no longer active.
Note: The normally open or normally closed signal must be isolated relay contacts. Piggybacking with other devices may cause false alarms.
Troubleshooting
Possible Cause | Component to Check | Recommended Action |
Incorrect input signal setting | SFT parameter in D Menu and input signal on terminal 41 and 5 | Adjust SFT in D Menu to switch between normally open and normally closed alarm input. If using the pGD, this parameter can be accessed under Manufacturer Menu – C2a. |
Loose/incorrect alarm wire | Smoke/Fire alarm wiring (see diagram below) | If the detector relay is closed but the controller is receiving an open signal between ID4 and IDC1, verify/tighten alarm wiring according to the Smoke Fire Alarm Wiring diagram below. Note: Switch on smoke detector must be a form C contact (no voltage on smoke detector contacts when signal wire is not connected). |
Smoke/Fire detector is falsely triggered | Smoke/Fire detector | If defective, replace detector. |