3/4" from the meter does sound small, but should be adequate enough to operate the furnace alone. As a test, do not use the range (if gas) or the water heater while trying to use the furnace above 70 degrees. Even the 1/2" pipe should carry over 70,000 BTU's. This does sound odd because the size of the flame (output) is the same no mater where you set the thermostat, just the length of time being on varies (unless it is 2 stage).
Whatever the culprit, the warranty should cover it. Call them out.
--- In DoIt_Yourself@yahoogroups.com, "jay.mendoza72" <jay.mendoza72@...> wrote:
>
> Hello,
>
> I'm hoping to find some answers here regarding my newly installed Wall Furnace. It's a brand new 25,000 BTU Natural Gas Top-Vent Wall Furnace. Everything worked well when we lit up the pilot but when we increased the thermostat past 70 degrees the pilot shuts off. I've tried several times and it's always the same problem. I did some research and one reason I think that might cause it is the gas line:
>
> -The gas line from the city coming into the house is 3/4 inch.
>
> -The distance from the gas meter to the furnace is approximately 85 Feet.
>
> -From the gas meter at the front of the house, the guy installed a 3/4 Inch gas pipe that runs underneath the house is about 32 Feet.
>
> -And from there, he connected it to a 1/2 Inch gas pipe all the way to the furnace.
>
> If anybody can tell me what's causing this problem of mine would be very much appreciated.
>
> Also, if this is the case, will a 14,000 BTU Wall Furnace work instead?
>
> Thanks in advance!!!
>
> Jay
>
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