The Lennox 17W11 Defrost Thermostat is a critical OEM replacement part designed to regulate the defrost cycle in high-efficiency heat pump systems

accommodating the varying internal geometries found in multi-position coils without requiring additional field modifications

The Daikin-McQuay 107193101 Automatic Freeze Stat is a critical low-limit safety control designed to protect hydronic heating coils and cooling coils from catastrophic freeze-up conditions

Designed for low pressure steam heating boilers

Lennox 36W77 Pressure Switch Freon The Lennox 17W11 Defrost ThermostatAs a seasoned technician, you know that a failing 2 stage pressure switch can ground a high efficiency furnace during the peak of the heating season. The Lennox 36W77 is a dual stage assembly engineered specifically for variable capacity and modulating furnaces, such as the G71MPP series. This genuine HVAC OEM part features two distinct set pointsa Low Fire stage at 0. 25" W. C. and a High Fire stage at 1. 22" W. C.to ensure the inducer motor is