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The McDonnell & Miller 67-LQHU (Part Number 149500) is a field-proven mechanical low water cut off engineered specifically for residential and commercial steam boiler applications
High Pressure Capacity: Safely handles supply pressures up to 400 psig for residential and commercial infrastructure
which protects your electrical service
a NEMA 4 or 4X rated RIB model would be required
Tekmar Controls 153 Control R-407A The McDonnell & Miller 67-LQHUThe 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
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