Lennox 59W34 Pressure Switch 320788-702 while Proportional mode relies on

while Proportional mode relies on fixed differentials for traditional multi-boiler staging settings

protecting the expansion valve from premature wear and ensuring HVAC system reliability

Flexible Installation: The 48-inch length offers maximum versatility for field technicians servicing deep-set burner trays

allowing for clear visibility and access to dual-dial configurations commonly found in heating-cooling pneumatic thermostats like the T-4756 high-volume output models

Lennox 59W34 Pressure Switch 320788-702 while Proportional mode relies onThe Lennox 59W34 High Pressure Switch is an essential OEM safety component designed for heavy duty application in residential and commercial cooling systems. This SPST high pressure control is engineered to monitor high side refrigerant pressures, providing critical protection for the compressor and system piping. This switch actuates at 640 PSI to immediately open the control circuit and resets at 475 PSI, ensuring the unit stays offline until