• Adjustable pre and post-purge LED status/diagnostic indicators Selectable voltage avoids false triggering by electronic burner controls Prover switch check circuit verifies fan prover switch is open prior to operating 10 sec prover switch delay eliminates burner start up or wind induced prover switch short cycling 5 VDC fan prover signal eliminates issues with switching burner load through prover switch contacts

The UC1 is the new standard interlock control for Tjernlund's full line of Fixed Speed Power Venters, Draft Inducers and Combustion Air In-Forcers. It can be interlocked with virtually any burner control circuit. Interlocks with any 24-120 VAC burner control circuit and also includes "dry" contact actuation option. Selectable voltage eliminates false activation by burner control circuits. After each burner cycle the UC1 will continue to operate in post-purge mode to allow the venter to purge the heater and vent of residual flue gases. A factory post-purge time is set at 2 minutes and is adjustable upto 16 minutes.