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Old 12-04-2011, 12:27 PM   #1
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furnace does not like temps under about 40...


Hello all, I am new to this fourm, I have read a few posts and think I may have an idea of my issue but want to flush it out a bit.

I have an rooftop HVAC gas unit that is about 10 years old. The last two winters (this being the second) the heater works fine and with every expectancy EXCEPT when the temps reach under 40 degrees. I live in Las Vegas, NV so this happens not so frequent, but it happens enough.

I had a HVAC contractor I know (he has done a lot of our buildings at our achitectural office) look at it last November. He replaced a vacummn line and that seemed to work at the time, but then again it was an easy winter.

This year again on our first "cold night" (under 40) the heat didn't turn on, in the morning (with warmer temps) it turned on just fine.

Any suggestions? I can upload some pics when I get a chance to get on the roof. My guesses are:
1. The colder air causes a vacuum lock....
2. The temp range is to much to over come and it cycles off?
3. Bad flame sensor (but this doesn't explain why there are issues only when temp is under 40)
4. The regulator at the gas meter is restricting addition gas flow that may be needed

Ken
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Last edited by thepunk76; 12-04-2011 at 12:47 PM.
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Old 12-04-2011, 03:48 PM   #2
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furnace does not like temps under about 40...


It maybe the fresh air calamizer is stuck open if one is on it

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Old 12-04-2011, 05:00 PM   #3
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furnace does not like temps under about 40...


i think you mean economizer....................LOL!!!! Never heard it call a calmizer before!
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Old 12-04-2011, 05:38 PM   #4
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furnace does not like temps under about 40...


Quote:
Originally Posted by hvactech126 View Post
i think you mean economizer....................LOL!!!! Never heard it call a calmizer before!
OMG I did spell it wrong lol
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Old 12-04-2011, 08:02 PM   #5
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furnace does not like temps under about 40...


That would make a difference and not kick in when its 40 or cooler but not at say 55?

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Old 12-04-2011, 08:28 PM   #6
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furnace does not like temps under about 40...


Is this something that I can see operating or not operating?

ken Sent from my EVO using DIY Chatroom

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