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Old 10-21-2012, 01:33 PM   #16
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Forced Hot Air Heat - No Cold Air Return


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you can not inspect heat exchanger.....need a pro.... the fact that its pulling return air from basement and is filtered..make me feel alittle better...but only 3-4 runs off furnace ...still would not be within the specs of tempeture rise....seems to me it would be cycling on and off high limit.....how big is furnace...btu...
It appears it is a 100,000btu furnace from what I can tell.

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Old 10-21-2012, 01:49 PM   #17
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Old 10-21-2012, 07:28 PM   #18
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Correct. This is where the air is drawn in, filter is brand new.
Where is that filter in relation to everything else?
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Old 10-21-2012, 07:36 PM   #19
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Where is that filter in relation to everything else?
If you are standing at the furnace looking down at this filter, the "front" of the furnace would be to your left.
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Old 10-21-2012, 07:39 PM   #20
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So this filter is actually attached to the furnace? Is there a vent in the furnace room door or walls? How does return air get to the furnace now?
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Old 10-21-2012, 08:01 PM   #21
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Correct. It's an all in one unit. From the pictures I posted above, the burner section is in the middle of the cabinet. The Blower Motor is in the bottom of this cabinet (right behind the filter) and the plenum is on the top.
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Old 10-21-2012, 08:04 PM   #22
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Got it. Now how is air getting into the furnace room? Are there vents in the door or wall? It has to get in there from somewhere. With that being said, you could terminate one of the supplys which go to your apartment at the wall. Then you would have to block off that supply at the plenum.
The furnace would then draw air through the old supply duct as if it was a return. This would help a bit, depending on which supply you disconnected and how it affected the rest of the apartment.
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Old 10-21-2012, 08:05 PM   #23
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So this filter is actually attached to the furnace? Is there a vent in the furnace room door or walls? How does return air get to the furnace now?
The basement is divided up into storage areas between the three apartments, but they are not separate rooms. Nothing is airtight. The air drawn into the blower, is sucked through that filter and sent upstairs, so it is just the air in the basement. No air returns from the apartment directly to the furnace (or basement). The building is old, and uninsulated so I'm sure air exchanges on some level, but it's not on purpose.
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Old 10-21-2012, 08:08 PM   #24
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Return air grill placement works the best when it's in the area being conditioned. Otherwise it just comes from crevices and any other openings, including outside air infiltration. A direct run to your apartment will help condition the space.
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Old 10-21-2012, 08:19 PM   #25
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Return air grill placement works the best when it's in the area being conditioned. Otherwise it just comes from crevices and any other openings, including outside air infiltration. A direct run to your apartment will help condition the space.
This was my exact thinking, and the reason for the thread. However, I don't want to cause more issues by doing this.. there is probably (approx) 5' of the round duct in the pictures between the output of the furnace, and the rectangular duct that runs from the basement up to the 2nd floor register (2x4)

I couldn't tell from that service tag the required CFM for the unit
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Old 10-21-2012, 08:45 PM   #26
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I should point out that many of these pressed steel burners (in your photo) deform over time. Many have ended up changing their furnaces because they could not get replacement burners. When the furnace is burning you should look for full flame all the way down the length of the burners. When they start to deform the flame will often only be part way along the length or just on one side. These deforming flames often cause premature exchanger cracks.
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Old 10-22-2012, 06:26 AM   #27
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That install is both illegal and dangerous. You can't have an open return like that depressurizing the room with a 80% furnace. When it does cause a back draft of CO in the flue it gets sucked into the return and distributed out the supplies.
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Old 10-22-2012, 09:29 AM   #28
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Understood Marty. I feared this was the case. Interesting that the gas company has been out in the past, and never mentioned anything. For what it's worth, luckily it would seem, we've never had the CO detectors go off in the apartment. This is obviously something that needs to be addressed right away. How would I go about determining the minimum airflow required for that return?

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