and NM series actuators

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

Includes a durable forged brass stem and ergonomic isolation handle for reliable manual flow control

protecting the heat exchanger from overheating and preventing carbon monoxide fallback into the residential space

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

Tekmar Controls 302P Switching Relay 319852-301 and NM series actuatorsThe 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