[jmetrail]

I have a horizontal furnace and AC on a second floor - there's finished living space underneath.

Original installer did not put a drain pan in or a secondary drain. Just primary gravity drains for furnace and AC.

I think it should have a drain pan and secondary drain.

The furnace is sitting on two cinder blocks on plywood floor.

Any suggestions are how I can get a drain pan under there now? Can the furnace/blocks be lifted slightly to shimmy a pan under there, without disconnecting things etc.? The gas line is flexible but the vents are rigid PVC.

Thanks!

 

[jmetrail]

Pic here:

 

[jmetrail]

Is this the install? Whst size are those 5 duct runs? Looks like only 5, 5" runs.

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I think you’re right. But this is a low capacity, 24k BTU furnace.

 

[jmetrail]

Staring to get the sense ya'll are looking are more than drainage.

So you only need around 300 CFM

And will I have duct capacity for that, from what you see?

or less then one ton of air

I have a 12,000 BTU Kool King horizontal discharge.

For putting in a drain pan - I suppose I could suspend temporarily from ceiling, put pan in, and then drop back down onto blocks?

 

[jmetrail]

Someone capable and qualified to do it could lift the unit 1/4" with two nylon ratchet straps. Remove the concrete blocks, set them into a properly sized metal drain pan, and slide the drain pan w/blocks under the unit before lowering the unit back into it's original position.

Someone equally talented could hang the unit from the rafters, throw away the concrete blocks, and install a heavy plastic drain pan under the unit.

How long ago was the system installed? How did it pass inspection? Was there a permit issued for the installation? Why not call the original installer and ask him to take care of it for you?

PHM
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This is an apartment still under construction and has not been inspected yet - it will be though. Furnace was installed a couple months ago. The HVAC guy doesn't seem to know what the code requires for drainage and has resisted putting in a pan (instead he suggested just putting in a moisture shut-off switch in the secondary drain hole), so I thought I'd just do it myself if it were easy.

(I sound like its not though, and I am going to have to fight with him to come back and do it properly).

 

[jmetrail]

Is this picture current, because I don’t see a completed install.
You don’t have enough duct for 1 ton of cooling.
Was this a DIY install? Did you buy equipment off the internet and have it installed?

The pic is old.

Not a DIY - designed and signed off by city.

Drawings show exactly 300 cfm. Is that not enough for a 1-ton A/C? If so what be the consequences of running 1-ton with 300 cfm?

From another thread - it seems like 300 cfm is certainly less than ideal, and the effective btu/h cooling for the system is going to be less than 12,000 BTU, but that the system would still work.

It's a small apartment and the cooling load is only 8,000 BTU - which is maybe why HVAC guy thought it would work okay?

 

[jmetrail]

I have a 12,000 BTU Kool King horizontal discharge. What about the indoor coil size, guessing 1.5 ton?

I don't know for certain - but probably 1.5. Don't think they make 1 ton coils?

 

[jmetrail]

For required CFM per ton though - is it size of coil or size of AC that matters?

300 cfm per 1 ton seems not-ideal, but would still function.

300 cfm per 1.5 ton might be a different story.

 

[jmetrail]

FWIW, the duct design/sizing was done by a licensed designer, and signed off by the city building dept.

I don't know if a 1-ton AC was specified (in Canada they seem less concerned about cooling than heating), but they absolutely signed off on the 24,000 BTU furnace with this duct design.

In this pic, the condensate lines haven't yet been completed.