Need help with furnace

wa8yxm wrote:

John Wayne wrote:
My guess would be it hasn't been used in awhile and had air in the propane line.

This is another one I hear all the time...

First: The furnace burns gas fast enough that if there were air in the propane line it would be blown out on the 2nd attempt and by the 3rd attempt there would only be propane in the lines.

Second: how did the air get INTO the propane lines? Some folks talk about "Well when you unhook the bottles to change/refill them" true, a teaspoon or two of air can get in then.

But I grew up with propane, 3 different systems on the farm, One for the house, one for the other house one for the milkhouse, and not one of them ever had that problem even when we detached the 100 pound bottles and took them to town (Actually 3 or 4 towns over), not the nearest town) and back to re-fill them and brought them back.

IT all worked fine, Never had so much as a water heater go out due to air in the lines.

One system was a space heater (In fact two were)
One was a water heater and kitchen stove/oven.

Not one of them ever had air-in the line problems.

A lot of these RV systems have very small leaks in them. Not enough to cause a explosion or anything but, enough that if they set around with the valve on the tank closed for a few weeks/months the line can go empty. On my TT in the spring it takes a couple of minutes for gas to reach the stove burners to get them to light. The fridge or furnace will shut down and go into lock out in that amount of time. Once I get the stove to light it only takes 1-2 tries to get the furnace or fridge to light You right though, just changing the tank does not get enough air into the line to make a difference.