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Old 05-11-2013, 01:45 PM   #31
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That makes sense. I thought heat pump warranties were transferable? Well at least if the original owner purchased the transfer option. I can't find any facts about "service facts" on their website.

I just pulled up the SF for a 16i. Doesn't have the extended data in it.

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Old 05-11-2013, 01:50 PM   #32
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Well now, 4 ton it is....I will have to check this with other manufacturers. In general, do most 4 ton have this rating?

Each manufacturer is different. Some will be less, some will be a tad more.

All of them will lose capacity as the outdoor temp increases.

If you really want a 20i. Then get a new one through a dealer, and get the 10 year parts and labor warranty.
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Old 05-11-2013, 02:33 PM   #33
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So I'm on other manufacture websites like Goodman, and see there are different charts for high stage and low stage. Their 4 ton DSZC18041 has a lower BTU capacity then the high stage.
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Old 05-11-2013, 02:44 PM   #34
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Nevermind. I think I figured it out that this unit for example has two stages of cooling for hotter days compared to milder days...
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Old 05-11-2013, 03:14 PM   #35
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All 2 stage units have 2 ratings for the same conditions.
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Old 05-11-2013, 03:20 PM   #36
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All 2 stage units have 2 ratings for the same conditions.
Where I'm getting confused is the CFM per each rating. Even though I did a load calculation, I didn't do anything with CFM. The chart on the Goodman website for this particular model has different capacities for different CFMs.

Does each unit put out different CFMs based on duct design? How does it work in relation to the chart when I choose my unit?
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Old 05-11-2013, 03:27 PM   #37
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The York info I posted was at the highest rated CFM. It had 2 of CFM ratings.

For your area, use the highest or second highest CFM rating. CFM is chosen to meet the shr requirements of the home. shr= Sensible Heat Ratio.

Manufacturers use what ever CFM that will get then their AHRI rating. They then either test it at other ratings, or use computer simulation to extrapolate BTUs ratings at other CFMs.
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Old 05-11-2013, 03:46 PM   #38
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The York info I posted was at the highest rated CFM. It had 2 of CFM ratings.

For your area, use the highest or second highest CFM rating. CFM is chosen to meet the shr requirements of the home. shr= Sensible Heat Ratio.

Manufacturers use what ever CFM that will get then their AHRI rating. They then either test it at other ratings, or use computer simulation to extrapolate BTUs ratings at other CFMs.
But what correlation if any does the CFM have from this chart by me choosing the highest one (1969) on me designing the duct work?
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Old 05-11-2013, 04:13 PM   #39
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I don't know what chart your referring to. A room by room load calc tells you what CFM each room needs. this is based on the sensible and latent load of the rooms. A manual D is then used to size your duct work.

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