Tekmar Controls 257 Control 321894-706 ensuring matched impedance for the

ensuring matched impedance for the ignition control module

and 4-20mA (utilizing the included 500 Ohm resistor)

Relying on high-quality HVAC expansion valves reduces callbacks and ensures long-term system stability in demanding residential and light commercial applications

2-way normally closed solenoid valve specifically engineered for high-demand industrial steam applications

this unit is a fixed-set

Tekmar Controls 257 Control 321894-706 ensuring matched impedance for theThe Tekmar Controls 257 Control is a purpose built 24Vac domestic hot water two stage boiler control designed for high demand applications such as hotels, laundromats, and multi family residential complexes. This sophisticated microprocessor control provides high accuracy domestic hot water temperature regulation by effectively staging up to two on off boilers or a single two stage boiler. Utilizing an NTC thermistor 10k ohm sensor, the 257 maintains