The "Hold Open" switch allows the technician to keep the damper open during maintenance or startup without the burner being energized

Vibration Mitigation: High-tolerance brackets reduce harmonic resonant noise and mechanical stress on the blower assembly

The PKZM0-20 is designed to provide short-circuit protection

which eliminates the need to cut into or disrupt the system's 1-inch NPT equalizing pipes

Why does my 24V relay coil feel hot to the touch during operation

Tekmar Controls 302P Switching Relay 319852-301 The "Hold Open" switch allowsThe Tekmar 302P Switching Relay is a professional grade solution for managing 2 zone hydronic heating systems with integrated priority logic. Designed for heavy duty commercial and residential applications, this unit allows a technician to connect up to two 24V (ac) thermostats to control two 115V (ac) circulator pumps. The microprocessor control provides a RoomResponse signal to optimize modulating condensing boiler efficiency by communicating real