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 This alarm is reset automatically when alarm is no longer active.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.
|Component to Check
|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
|If defective, replace detector.