Original message
| redparis
 |  "HVAC Short Cycling"
, posted Wed 27 Feb 11:33  
In the heat mode, unit is short cycling. If I take out the filter or not, it is the same. When I open the service door for the blower, and give it as much air as possible, short cycling stops!
I have made sure nothing has blocked the incoming and outgoing vents, even took off all the vent covers. Not sure if the unit has always done this.
Inside unit thermostadt is set at off=60, on=120, off=160 with a govener set at 160.
Unit shuts off at 160 in about 2-4 min. Room temp has not been met.
It seems there is not enough return air.
What can I do to resolve this??
If a picture could talk we would all look away.
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Replies:
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| knightofthebass
| "Re(1):HVAC Short Cycling" , posted Thu 28 Feb 13:52
I charge $50 for a service call, which includes up to the first hour.
Cool Squad
(949)235-1095
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| theduke03
| "Re(1):HVAC Short Cycling" , posted Wed 27 Feb 18:11
That thermostat inside unit is a fan/limit control. I'm not sure of the requirements for your furnace but I usually see the high limit set between 180 and 220. Yours is at 160. You can raise that setting. Turn off power and simply move the indicator on the dial. You have to hold the dial in with your thumb while you make adjustments so it doesn't spin as this can cause damage to it(so I'm told). Maybe you should try 180 to 200 and see if the burner will run continuously. If you have the books for the furnace they may specify how high the limit can be set. You could also downfire the burner. The lowest setting is Fan off and 60 sounds low. By the time the fan shuts off it may feel like cold air blowing from vents. I usually set that to 100.
You can't put a price on comfort! Be Safe.
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| | redparis
| "Re(2):HVAC Short Cycling" , posted Wed 27 Feb 21:44
Thanks, but I cannot set the hi-limit higher than 160. It has something on it to prevent it from going higher.
Any other ideas??
If a picture could talk we would all look away.
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| | theduke03
| "Re(3):HVAC Short Cycling" , posted Thu 28 Feb 19:25
Is that gas or oil? If it's oil you may be able to have it downfired. Most likely furnace is too big or ducts are too small. No easy fix for either. What is the make and model# of your furnace? What size are your Return and supply ducts?
You can't put a price on comfort! Be Safe.
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