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or a temperature differential across the valve body indicating internal bypass or a "bleeding" slide
Frequent signs include the outdoor unit failing to enter defrost
Self-powered operation allows for continuous heating system functionality during power outages
Can this 75VA transformer replace a 40VA or 50VA model
it supports natural
Lennox 78H74 Limit Switch 319848-301 or a temperature differential acrossThe Lennox 78H74 is a critical OEM L185F limit switch designed for precision thermal protection in residential and commercial Lennox heating systems. As a primary safety control, this high limit switch monitors internal heat exchanger temperatures and is engineered to open the electrical circuit if the ambient temperature reaches the L185F set point. This rapid response prevents internal overheating and ensures the system operates within safe HVAC
US$ 113.00
US$ 180.00
US$ 177.00