heat pump question

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Old 12-07-14, 06:05 PM
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heat pump question

If you get a new complete heat pump system and it is a 3 and 1/2 instead of a 3 ton will the duct work have to be replaced to larger size also? Is not a split system and is on ranch style home-no upstairs.
(an addition was put on home by past owner but no upgrade on the heat pump)
Any info is appreciated on duct work sizing
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Old 12-08-14, 10:42 AM
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200 more CFM most likely will not be an issue. might be a bit noisy, but if its that close it probability was noisy before. What size is the return and supply now?
 
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Old 12-13-14, 02:19 PM
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It is a 14 inch duct.is it the same for 2 and 1/2 ton to 3 also?
.I also was wondering if the breakers/fuse would still be enough for it also.It has a double 100 amp at main panel and then a set of 60s for heat and a set of 60s for cool on the fuses-pull out style- before it goes to the system .The new system will have 10kw heat.
What is average sizing for these as to breakers/fuses on 3 ton single stage complete system?
Thanks .
 
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Old 12-13-14, 07:28 PM
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60 amp breaker for an air handler with 10kw.
30 amp breaker for the outdoor unit but refer to the nomenclature.

Adding a second return air or enlarging the existing one would be a good idea.
 
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Old 12-14-14, 12:34 AM
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14 inch is way to small for a 3 ton. I'd recommend 20inch.
 
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