Rv Furnace Limit Switch Test

These limit switches allow the fire box exhaust on side of trailer to get up to 405 degree. Time delay relay used on older furnaces newer furnaces have the relay incorporated into the circuit board this relay performs two separate jobs one to handle the relatively high current needed to run the blower motor and two to allow the blower to run for 45 to 90 seconds after the thermostat is satisfied. Once the plenum reaches a specific temperature the limit switch sends a signal to the air handler to begin running and delivering warm air to your home.

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Original limit switch had a product crosss referenced the number and the mfg spec were 170 open 150 close.

Rv furnace limit switch test.

Took both switches to a test lab and tested them. The exhaust is an air outlet on the exterior of the rv that exhausts the gases produced during the combustion process the gases are a combination of carbon dioxide and carbon. Stays lite for about 5 seconds and then goes out lites again in about 10 seconds. Any ideas on what the problem ma.

Turns on ok fan starts gas ignition occurs. That thermo switch opens if the furnace gets too hot and shuts down the gas. Continues this cycle until turn the stat down. Tried a new limit switch.

Atwood hydro flame 8940 in a fifth wheel. These two switches are safety switches and they are in series which means power passes from one to the other and then to the module board which sends power to the gas valve and the igniter which. The ducts carry the heated air from the furnace to the interior of the rv. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

Ordered new limit switch atwood 37022 hydro flame limit switch 190 degrees around 15 with shipping paying attention to get one with correct limit temperature and also trying to find out with rv manufacturer for no reason i decided to contact them not atwood whether it s possible to take sail switch out without taking the furnace unit out. 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 dsi is an acronym direct spart ignition it s an electronic igniter that uses a spark ignites the gas air mix. It reads the temperature of the plenum and waits until it gets appropriately warm.

The sail switch then sends power to the high limit temperature control. Does not provide enough heat to maintain temp. They both opened at 170f and closed at 150f. A limit switch is a device that s located under your furnace s supply plenum.

Troubleshooting the rv furnace.