new furnace won't stay lit, unitary by York, 80%, 75,000 btu GF8
Posted 20 December 2006 - 04:31 PM
Let the experts speak, I will listen. stevek
Posted 20 December 2006 - 04:48 PM
Verify that your electrical supply has a proper ground, the flame sensing circuit will not work properly without it.
Posted 20 December 2006 - 04:52 PM
Posted 21 December 2006 - 05:16 PM
Posted 21 December 2006 - 06:07 PM
Posted 22 December 2006 - 10:42 AM
If there is one there, it could be A: Defective or B: Unecessary.
I have had older furnaces that required or had gas regulators and the new one does not. My experience is that upon start up there is enough pressure in the line to hold open the regulator but as the furnace lights and consumes the gas, it lowers the pressure to the point that the diaphram inside the regulator closes. Your furnace only realizes that the flame goes out (due to not enough gas pressure making its way through the regulator). It shuts off, the gas pressure builds back up while the unit purges and goes through its start up procedures.
After 3 times of this off and on, the idiot light on the board says flame not detected. If you do have a regulator, try removing it and then starting the system and see if this will give you better results
Posted 28 December 2006 - 02:44 PM
I agree with applman & dkpd. Especially since in your post you say a new gas meter was installed. Wouldn't be the 1st time the gas company forgot to open a valve up after a meter replacement. Go out to the meter and C if all the valves are open.
Do you own any other gas appliances and are they working ok?
Are U on natural gas or LP and is the unit possibly the wrong type?
Is there a knob on your gas valve that is set to pilot and need to be turned to main flame.
You need to check the gas pressure :poison: before and after your gas valve. Had a job that the entering pressure was to high and the units valve would shut down, just like Urs is doing.
Have a tech come out and check it. Gas is not something U want to mess around with if your not qualified. Ur gas company may also do it for free. Call them.
Hope this helps:)
Posted 17 February 2007 - 01:56 PM
Posted 18 February 2007 - 06:22 AM
-old Irish saying
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Posted 19 February 2007 - 02:26 PM
Measure, measure, measure. An overfired or underfired burner will not work properly.
The two things you need to know -
1) inlet gas supply pressure (natural gas typical supply pressure is 7"w.c.(water column) equivalent to 1/4 psi. Your supplier should be able to give you this information upon request.
2) manifold pressure(pressure after the gas valve in your furnace) typical is 3.5"w.c. - see your nameplate for specific value.
If you are choking down the inlet pressure it will decrease the manifold pressure. On a new furnace start up the manifold pressure must be checked.
Posted 23 February 2007 - 06:14 AM
Check on any recalls that could be on your furnace. Other than that you could check on a gas piping sizing chart to see if you have the right size piping to your furnace. depending on your house size you would need a 90,000 btu furnace for an 1800 sq ft home.
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