Replacing old gas furnace question

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Old 09-22-08, 10:56 AM
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Replacing old gas furnace question

I am planning a gas furnace replacement in my home (doing it myself). I have air conditioning now, but I am just replacing the furnace for now, do I need to do anything apecial with the coil above the furnace when replacing the furnace itself? Or can I just disconnect the old furnace, remove it and slide in the new one?

Also, should I install the new furnace at a certain height as to prepare for future air conditioning replacement?
 
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Old 09-22-08, 07:38 PM
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It's hard to say how the coil was put in.

It may have a shelf sitting on top of the current furnace, and if you pull out the old furnace, the coil will down.

It may have support tied to the ductwork itself.

You won't know till it happens.

Is the new furnace going to fit like a glove into the old set up?
 
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Old 09-23-08, 04:57 AM
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No, the new one is smaller in size than the old one. I will have to make a shroud/hood for the new one. Why? Does that change anything as far as the coil goes?
 
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Old 09-23-08, 06:34 AM
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Depends on the size of the coil, if it's larager than the new furnace, then it will have to stay up, and may be more of a pain to do.
 
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Old 09-23-08, 09:06 AM
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You mean if the new furnace is smaller than the coil I would have to build a shroud to fit the old coil, correct?
 
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Old 09-23-08, 04:05 PM
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A shroud is for dead people.

The correct word is 'Plenum'. This is the transition sheet metal from the furnace outlet to the coil box inlet. Just support the coil box with SM straps to the joists while removing the old furnace. Make your measurements and bring them to a SM shop.
However, they may want to make their own measurements.
 
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Old 09-24-08, 05:48 AM
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Yes, it is a planum. I think I can get a brake to make it myself. Another question, should I install the furnace at a certain heighth as to prep for future Air Conditioner replacement?

Also, aside of the plenum, electrical connection, gas line, is there anything else important I should be cognisant of?
 
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Old 09-24-08, 05:51 AM
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Yes, it is the plenum. One more question: should I install the new furnace at a certain heighth as to prep for future Air Conditioning installation (Assuming the coil gets replaced when the outside unit does)?

Also, is there anything else that's really important for me to know other than the plenum, electrical hook-up, and the gas line?
 
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