Original message
| dick9
 |  "have Bard downflow 8 years old, short cycles"
, posted Wed 16 Jun 10:23  
Have 1800 sq. ft. ranch, R40, attic,R13 walls, lowe windows.Crawl space. Caulked and sealed to max. Bard is 100,000.
White Rogers electronic thermo. Furnace cycles too much when heating. When thermo calls for heat (about 1 degree from setting, furnace comes on and in about 5 min. requirement is satisfied, furnace shuts off, blower continues for a few minutes and then shuts down) then in about 15 minutes same routine in cycling will occur again. Is furnace too big? Blower is set for one speed year around (also have air cond.) Furnace is 80%. Live in central Indiana. Need a true technician and student of HVAC,
not a guy with channel locks and a neon voltage testing light.
Help with Bard downflow 8 years old.
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Replies:
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| Hube
| "Re(1):have Bard downflow 8 years old, short c" , posted Sat 26 Jun 13:08
I agree with Cinder,s remarks, especially about the T stat Anticipator ( needs adjustment) Good luck Hube
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| Cinder
| "have Bard downflow 8 years old, short cycles" , posted Thu 17 Jun 21:52
Check the locations of your vents and where the air comming out of them travels. You may have air flow heading directly to the thermostat satisfying it early. Also check the dampers in the vents and ductwork, more air could be being sent to location of the thermostat. Also make sure that all of the return vents are clear and unblocked, that cause uneven distribution as well. Normaly I find an oversized unit goes off on high limit.
5 minute short cycles in my experience are usually uneven air flow, direct air flow to the thermostat, or a bad or mis adjusted anticipater on dial type thermostats.
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| HVAC Doc
| "Re(1):have Bard downflow 8 years old, short c" , posted Wed 16 Jun 15:23
Sounds like it is possibly oversized but could have a few other factors involved as well. A good way to tell if it is oversized would be to run a load calculation such as: http://www.hvaccomputer.com/main.asp
and do a check to see if you need 100K BTU of heat.
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