A set of small HVAC questions

mm · 2011-01-30T16:17:15+00:00

1) My next door neighbor had a new AC put in and they replaced thecement pad the condenser sat on with a plastic one. Is there any pointto removing the cement one if it's in one piece? Later I saw a picture of the underside of a plastic pads andexcept for some ribs, it's hollow and has no bottom. Doesn't thatmean it will slowly sink into the ground and isn't that bad? My own AC condenser unit over the last 31 years has moved 6 or 8inches to the right, until it hangs off the edge the pad. Was thereany way to stop that in the first place? Screw it to the pad? Lateron? I was afraid of causing a leak if I pushed it back.2) When using a gravity feed condensate drain line, Goodman wants atrap in the line. I don't have one now. Is this to seal heated airin the furnace and supply ducts when in heating mode. Or to keepoutside air out?3) Do people really use a secondary drain pan in case the first drainplugs up? Or is it just a secondary drain from the same pan? If apan, where do they put this pan? (I read that it is required by codesome places.) It also says in the url above: ["If the uncased coil is to be installed on top of a gas furnace,allow enough space between the top to the furnace and thebottom of the plastic coil drain pan to have a free flow of air.]"A minimum of 2.0" distance from the top of the furnace andthe bottom of the coil pan is required. The coil should be installedwith the line set and drain openings to the front of thefurnace."Does this bit aobut the openings refer only to gas? I don't think so.For oil, is it necessary to have the openings at the front, and why?They're at the side now and work much better there afaic. In thefront, the flue will be in the way of the condensate drain pipe and inthe way if I want to take off the cover and look inside or clean theevaporator area. But my neighbor with the new furnace/ac has them atthe front (with no access door iirc, and her house is the mirror imageof mine, so the plastic...

Jan 30, 2011 20 Replies

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mm 15 years ago

Thanks a lot for your point-by-point answer.

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A set of small HVAC questions

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