Olsen gas furnace

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  #1  
Old 03-06-11, 11:50 AM
J
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Olsen gas furnace

Hi, it is an olsen mid-eff. gas furnace. The problem is that gas valve closes and the burners go out before the fan blower can run on high speed. It will make about 3 attempts before finally shutting down. We had the induced blower replaced last spring and this is the 2nd time we have had very strong winds blowing into the exhaust vent outside this year, and both times this problem has started. It is about a 12 foot run of exhaust pipe from the furnace to the outside. Not sure if this new induced blower has enough strenght to counteract the very strong winds. The new blower is now a negative pressure setup with the new oriface on the intake side of the blower. Might know more when the winds calm down. Or could the problem be the fan limit not sending the signal to start the fan blower on high speed. Could it also be the relay for the fan blower not working properly? Any help would be greatly apreciated. TIA

JAMC
 
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Old 03-07-11, 05:03 AM
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have you tried running the blower from the thermostat?
 
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Old 03-07-11, 04:04 PM
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Originally Posted by hvactechfw View Post
have you tried running the blower from the thermostat?
Yes the fan blower does work on high speed when turned on at thermostat if that is what you meant. But the furnace would still quit before completing the cycle.
 
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Old 03-07-11, 04:16 PM
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The furnace is now working properly since the wind has subsided. It is now obvious that the new induced blower is not a strong as far as blowing strenght compared to the old blower. This could be because of the orifice restrictor plate now installed on the intake side of the blower for a negative pressure switch system. The problem now is to come up with something to increase exhaust pressure to overcome strong wind back pressure. Could the orifice hole on the plate be opened up a little to increase blower draw or to install a booster blower on the vent, or a whirly-bird type vent as on top of a roof be used to help draw the exhaust outside?
 
 

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