Originally Posted by herblee
Have 1970 mobile home which I bought when it was 3 years old..it had natural gas furnace..which worked great for many years. A couple years ago someone checked it and it had cracks in the heatbox so had to get new one. When removing the old one there was some type of thin metal 2 sided thing which went down through floor. When installing new Miller gas furnace it didn't have (whatever that was) and just sat over the opening in the floor... Which blows through ductwork. Problem is now the furnace just draws so much air from inside the trailer.. That it pulls cold air from anywhere possible..around sliding glass doors..entry door..also if there is a fire in the fireplace... It pulls the smoke down the chimney and into the trailer.(the old furnace never did this) Is there any way to correct this problem.. The furnace is actually in a cupboard with a door and door has louvers for air flow... A thought I had was.. Around the flue pipe going through the ceiling.. The hole for the pipe is much bigger than the pipe..so there's quite a big of open ceiling around the flue.. IF the louvers were closed off on the door...would it be possible for the furnace to then draw air from up above the ceiling.. And stop drawing air from the inside of the trailer.? Also if the temp ouside is really cold..and thermostat is on 70.. The furnace blows warm air.. While sucking in cold air..and just can't reach temp and just continues to run. Hope you have answer and Thanks
The new Miller furnace you bought back then had to be installed with a NEW Miller Roof Jack for the new furnace and associated new flue pipe to allow combustion air into the new Miller furnace. If this was installed when you installed the new furnace then you would not be having this problem you are having now. Mobile home professionals know this and I guess whoever installed your furnace did not read the install instructions. Mobile home furnaces are different from a regular home furnace and this does cause many a misunderstanding.
The link below goes to a professional mobile home furnace site. The people who manage this site are mobile home professionals and can help you. NOTE: You cannot change or modify the way this system works except to use the exact factory parts that are installed as per the manufacturers instructions, Post your question there under Nordyne
/Miller/Intertherm posting area. I just hope the proper parts are still avaiable for your furnace. One other note. With the furnace being installed in a unsafe manner you are lucky that you have not had a fire since your insurance company looks for this type of problem during there fire inspections. Many mobile home owners have had there policy canceled after a fire when it is discovered there is no HUD required outer air supply/flue pipe cooling jacket installed on the furnace. Make sure to post your exact model and serial number along with your problem.
Here is the link. Index page