Lennox 74W77 Limit Switch 320788-702 the RTB14 utilizes an adjustable

the RTB14 utilizes an adjustable weighted arm to maintain optimal system pressure

A19ABA-23 is identical to A19ABA-23C

including humidifiers and electronic air cleaners

the 5H0750020004 is the updated manufacturer part number and is functionally identical to the 5H75002-4

technicians should replace this element when the pressure differential exceeds 10 psi or during annual maintenance cycles

Lennox 74W77 Limit Switch 320788-702 the RTB14 utilizes an adjustableThe Lennox 74W77 Limit Switch is a critical OEM safety component engineered for precise thermal regulation within Lennox furnaces and air handlers. This L155 30F limit switch is calibrated to open at 155F and automatically reset when the temperature drops by 30F, preventing heat exchanger damage and ensuring safe operational cycles. Designed as a direct Lennox 74W77 replacement, this high limit control utilizes a bimetal sensing element to monitor