While horsepower may match

Physical inspection may show sensor tip erosion or mineral buildup

This manual reset limit switch is factory-calibrated to trigger at a fixed temperature of 140°F (60°C)

DPST-NO (2 Form A) power relay engineered to handle the high inrush currents typical of HVACR compressor loads up to 3

Tekmar Controls 153 Control R-407C While horsepower may matchThe Tekmar Controls 153 Control is a versatile, microprocessor based mixing setpoint control designed for precise floating action output. Engineered to drive actuating motors for valves or dampers, this unit maintains a constant supply water or air temperature across a broad range from 40 to 239F. For hydronic heating professionals, the 153 is a standard for implementing boiler return protection when paired with an optional return sensor, effectively