Air Conditioning - Carrier condenser size

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View Full Version : Carrier condenser size


wire twister
06-21-09, 05:21 PM
Alright Carrier guys here is an easy one,
Carrier condenser
Production no. 38yxa048---321
Model no. 38yxa048320
What size is it? Was told it was a 4.5 or 5 ton heat pump, just wondering if it is. Any info would be appreciated.

thanks
jimmy


srercrcr
06-21-09, 06:07 PM
Well, the 048 would mean 48000 btu, which = 4 tons.
As to heat pump....if you have a gas furnace, then no.
The thermostat may give you a hint.
The serial plate ought to also.

wire twister
06-21-09, 06:28 PM
It is a heat pump with a gas backup, that part works fine. This is part of a comfort zone system with 2 zones, on really hot days 95 and hotter it runs for a long time in the afternoons, which I would expect. The part I do not understand is the fan motor will slow down(it has the variable speed fan in it) and the interior temp will not drop or it will raise a degree and keep the unit running. My house is only 9 years old and is insulated very well. The installer did not insulate the return air ducts stating that they did not need to be insulated because of the gas furnace. I plan to insulate them this fall, too hot to do it now. I know you need a lot of info to figure correctly,but is this 4 ton unit even close to sufficient size for my house, 2200ft heated, 1 room with 13 foot ceiling rest are 8 feet, crawl space underneath, single story ranch style?


daddyjohn
06-22-09, 04:26 AM
if the house is well insulated then it's probably just fine. If you go too large, you'll have poor humidity control.

HVAC Software, HVAC-Calc for Heat Loss, Heat Load Calculations (http://www.hvaccomputer.com/)

For $49 you can do your own load profile.


btw- in Carrierspeak, the 38 means outdoor condensing unit, adding the Y makes it a heat pump, X and A have to do with design and engineering features of that unit, the 048 of course is nominal 4 tons, the 3= the power supply requirement- 208/230v 1 phase, I forget what the 2 means. Your furnace should be 58xxxxxxxxxxxxxx.

srercrcr
06-22-09, 04:43 AM
Lacking any other info, I would have gone with a 4.5 ton. Either way, IF you're undersized slightly that might be an advantage in Georgia. The longer runtimes means better humidity control. You should have some way to specify the relative humidity you want, whether on a separate humudistat or on the thermostat.
Here's what I've written before about that....

A humidistat only costs maybe $100 for the part. Check with your contractor to verify but with mine.....I set it to a certain humidity % and as long as it is wetter than that inside.. the unit will automatically run at slow speed to extend the runtime before reaching the desired thermostat temp setting. Need a variable speed blower to do this. Works good in the morning when the unit may not go on cause there's little heat load but humidity is 85% outside. You have to play with it, cause if you have it set too low, it'll never shift up to high speed. During the hot day you want it running high speed for max cooling, and it will cycle enough that the air will dry out.

By my setting it at around 62% I hear it occasionally running at slow speed, shifts up to high, so its working good. Keep in mind it is most efficent at high speed.

wire twister
06-22-09, 05:02 AM
Okay guys thanks for the replys, it helps to clear things up.