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diyrepair

09:33PM | 10/12/04
Member Since: 08/17/04
16 lifetime posts
Bvhvac
I don't know where to begin on this one...

First off, it's a coleman Evcon furnace, located external to the house in Wisconsin(yeah... I wonder about the previous owners...)

Anyways, the ductwork runs through the walls to the attic. The ducts do not seem very large for the size house. It almost seems as if the house itself had a heater in the attic at one point in time.

There are 2 cold air returns (one located in the back living space, and one not connected in the attic. There is a moderate amount of airflow through the living room vent (it's 3 feet from the furnace). The attic return does not have much airflow to it.

I replaced the furnace filter a few days ago (the last one was really dirty). I checked the ductwork, and everything is connected, nothing is crushed (that I can see). The ductwork is insulated, and there doesn't seem to be any major air leaks.

The heat vent in the living room kicks out a lot of air (I would have to say just a bit more than the average furnace would). The rest of the house cannot even come close to the air volume coming out of the living room duct.

When I went outside and opened the filter cap, I noticed a very large quantity of air being sucked in. This may have had something to do with the air filter restricting the air flow (point of least resistance....), but I could be wrong. I didn't think of running inside and feeling if more volume was coming though the vents.

I don't know what exactly is causing this, or how to fix it.

Obviously a plugged air return could be the problem, but most of the ducts are in hard to reach places. Are there any easy ways to test this?

The blower motor could be failing, but shouldn't the pressure be constant, instead of most air flow in 1 vent and very little in the rest I guess that situation could be true since the vent with the most airflow is the closest one to the heater.

The main ductwork appears to have to go through studs to get to the attic. Could the previous people cut corners to get from point A to point B, causing a massive restriction in airflow?

Or, should I just call the pro's? The unit needs an inspection anyway, but the heat portion does work...

Thanks

tomh

07:56AM | 10/13/04
Member Since: 07/01/03
558 lifetime posts
This furnace may be subject to a recall due to a defect that causes failure of the heat exchanger. I copied information and model numbers below from this link http://www.colemanac.com/heating.asp

Airflow could be impeded by buildup on the AC evaporator exchange coil on this unit. A pro can inspect and clean. Also, duct work can be disconnected or leaking. Significant leaks can occur that the homeowner may be unaware of. The unit could be pressure tested or at least visually inspected. A pro could also determine if return volume is balanced with output. I recommend you have an inspection, and tell the person you are making an appointment with the problems and model numbers.

The heat exchangers of some Coleman®, Coleman® Evcon, and Red T gas furnaces have been found to overheat in certain circumstances, which can lead to a failure of the heat exchanger and the furnace.

What You Should Know

Is This Condition Dangerous?

It’s never good for the internal components of a furnace—or any appliance or electrical device—to run hotter than the temperatures they were designed to handle.

The problem has been traced to differences in installation, application factors and variations in components.

These situations, if left unresolved, can lead to significant property damage, personal injury or death.

You should have your furnace inspected if it is one of the models listed below.

How Do I Know If My Furnace Is Affected?

The Coleman®, Coleman® Evcon, and Red T furnaces are used in manufactured housing. On these furnaces the name plate is found mounted on the left inside surface behind the lower panel. The furnaces are a silver color with white access panels. (see photos below)

DGAM075BDD

DGAM075BDE

DGAM075BDF DGAT070BDD

DGAT070BDE

DGAT070BDF DGAT075BDD

DGAT075BDE

DGAT075BDF DLAS075BDD

DLAS075BDE

DLAS075BDF
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