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maintaining the precise pressure drop required to transition high-pressure liquid into a low-pressure saturated vapor
it operates on a 20-30Vac range with a manual changeover system (Heat-Off-Cool) and dedicated Auto-On fan switching
Restores original operating pressure differential specifications
it is the primary successor to the obsolete Honeywell VR8204M1901
preventing moisture buildup that can lead to pressure switch trips or secondary heat exchanger corrosion
Lennox 13H78 Relay 320074-702 maintaining the precise pressure dropThe Lennox 13H78 Relay is a heavy duty 24V DPDT relay engineered for precise switching control within Lennox heating and cooling systems. Built to handle dual circuit switching, this double pole double throw relay manages various voltage pathways simultaneously, ensuring consistent communication between the thermostat and high voltage components like blower motors or compressors. Operating at a standard 50 60 Hz frequency, the 13H78 is a critical HVAC