The unit is housed in a NEMA 1 rated plenum enclosure and includes an external LED indicator to provide real-time status of the relay coil activation

While designed specifically for Aprilaire equipment

A yellow flame often indicates an incorrect orifice size

While universal relays may match the amperage

Manual Reset Mechanism: Ensures thorough inspection of the combustion area by a technician before the unit can be restarted

Tjernlund Products UC1 Interlock Controller 340793-762 The unit is housed inThe Tjernlund UC1 Universal Interlock Control is an essential component for technicians managing draft inducer and power venter installations. This interlock controller acts as the central logic board, coordinating the sequence of operation between the HVAC appliance and the venting system. Designed for 24VAC, 115VAC, or dry contact call for heat signals, the UC1 features a pre purge and post purge cycle to ensure proper combustion gas evacuation.