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chadhumm

07:12PM | 12/02/05
Member Since: 11/16/05
4 lifetime posts
Bvhvac
I installed a new Goodman 93% effeceient furnace. Its 45,000 btu heating approx 800 sq ft. When it turns on it runs only 4 minutes shuts off and kicks back on 10 minutes later and runs another 4 minutes.(gas running 2 minutes and the blower alone running the other 2 minutes)(approximates) Does this short of a cycle seem normal, the temperature in the house does stay consistent it always stays at the set temperature. could it be the thermostat...should i use one with a heat anticpator so there is a larger temperature deviation before the furnace runs again and thereby making it run longer a little longer. Longer less frequent cycles are the most effecient. It would result in givng up a consistent temp but it would be marginal.. Does anyone have any other reasons why it runs on such a short cycles. Thanks for any suggestions.

chadhumm

06:33AM | 12/03/05
Member Since: 11/16/05
4 lifetime posts
yes in northern Illinois about 18 degree average this week. the furnace runs 5-6 hours per day, which doesnt seem excessive..at least i dont think it is. The house has an average amount of insualtion w/ old windows , it was built in the 40's. I don't think its an incorrect size for my home It was figured by a professional the 48000 btu--45000 btu output was the smallest natural gas forced air furnace i could find. i will eventually also be heating the basement once i finish it. the furnace i replaced was a 27 yr old 76000 btu furnace, being it was not nearly as effecient Im assuming I was getting the same 45,000 btu output im getting now. I just can't help but feel the programmable digital themostat is too sensitive ..for example I have it set at 68 my theory is it kicks on when the temp falls to 68.4 and then heats the room up to 68.6 and then kicks off. that would explain such a short run time and explain why it never deviates from 68 on the thermostat. Is that the nature of a programmable. Im not liking all the frequent short cycles I know its not good on my new furnace. Do they make programmable thermostats with heat anticipators or the ability to change the temperature differential. honeywell will not answer my questions.

chadhumm

10:46AM | 12/03/05
Member Since: 11/16/05
4 lifetime posts
Thank you HK your reply was very helpful I appreciate it. although I am confused on a few things, the fan running 24/7 will result in less wear than having it turn off and on 4 or so times an hour? Im not sure of the wattage and how this will affect the electric usage part of it. May I ask if you have figured what it costs you to heat your home per month...per/day?. If you've ever calculated it before. I figured mine to use .45 therms per hour the furnace runs so in this area at about $1.20 a therm w/delivery charge for natural gas and since it running about 6 hours It costs about $3.25 a day right now. The size of unit i need that you figured 11,500 btu's really suprised me. I moved into this house in march and it had a 76,000 btu 26 yr old furnace in it and i went down to the 45,000 btu furnace...had no idea i should have went as low as 11500. The old furnace didnt seem to short cycle like this but it wasnt as cold last march either so its not a good comparison. I will definately look into fan relay suggestion. Thanks again

chadhumm

05:36PM | 12/03/05
Member Since: 11/16/05
4 lifetime posts
thank so much you have been of great help to me. i do have a few other question on somewhat related topics. about the furnace itself. Ive posted before but didnt get any answers too. if you have time that is my email address is [email protected].
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