The sail switch is an on off device.
Rv furnace sail switch purpose.
The sail switch features a paddle arm that covers the blower air stream as the blower reaches full speed the sail switch is pushed out of the way this action allows for power to be passed to the ignition switch.
It s job is to determine if there is adequate air flow for proper combustion to take place.
It is a safety component that will not let ignition occur until it sees 75 of the motor s rpm s.
How do i test sail switch on the furnace it s 8531 atwood hydroflame answered by a verified rv mechanic we use cookies to give you the best possible experience on our website.
The sail switch is an air proving device.
How to rv furnace repair sail switch lighting procedure in this video i bench test a manual light propane rv furnace and locate the sail switch i also show h.
As the blower comes up to speed it blows air onto the sail with enough force to push the switch closed thus allowing electrical current to flow to the next component in line.