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Precision Switching: Calibrated to 0
2-way normally closed solenoid valve specifically engineered for high-demand industrial steam applications
making it ideal for high-pressure refrigerants
and 4-20mA (utilizing the included 500 Ohm resistor)
Tekmar Controls 257 Control 321894-706 Precision Switching: Calibrated to 0The 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
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