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Old 01-07-2013, 06:42 PM   #16
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1000 is a y2 call.

y1 is 670

Not to question you but wouldnt I want to leave the y1 from the zone controller connected to y1 at the air handler and just pass y2 through to the heat pump?

That would essentially make the air handler a constant speed no matter if y1 was calling or y2.

Or did I miss something?

I would set the air handler to run at 800cfm on low.

I really wish I had just ordered a 1200cfm blower from the beginning .... that way I could set it to run 800cfm on high and 600cfm on low.

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Old 01-07-2013, 07:07 PM   #17
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When the air handler gets a call on G, it runs the blower at 50% of high cool setting. So when the sat /zone panel calls for first stage with no Y1 connection at the air handler, it will run at 500 CFM if Y2 is set to 1000CFM. Y1 will run at 670.

If you set Y2 cooling speed at 1200 CFM, then a G call will be 600 CFM, and a Y1 call will be 804 CFM.
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Old 01-07-2013, 07:17 PM   #18
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Quote:
Originally Posted by beenthere View Post
When the air handler gets a call on G, it runs the blower at 50% of high cool setting. So when the sat /zone panel calls for first stage with no Y1 connection at the air handler, it will run at 500 CFM if Y2 is set to 1000CFM. Y1 will run at 670.
edit:

Looks like my documentation says the continuous fan is 30% of the maximum air handler speed .... so 30% of 1600cfm or 480cfm.

That might be to slow?

Last edited by swilk; 01-08-2013 at 01:19 PM.
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Old 01-07-2013, 07:26 PM   #19
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Recheck, i believe you can adjust that. Goodman has changed how they control the fan on their new air handlers. And I don't install them much anymore.
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Old 01-07-2013, 07:27 PM   #20
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Old 01-08-2013, 01:16 PM   #21
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Well my documentation was not a lot of help .... on one page it says that constant fan speed is 30% of maximum air handler speed.

On the very next page it says constant fan speed is 600cfm across all speed tap settings.

I went ahead and changed high speed to 1200cfm, low speed to 800cfm, removed y1 and switched y2 to the y1 terminal.

I also ordered a bypass damper today.

The changes had the result I was looking for. Still good airflow out the registers in the bedroom zone (used most this time of year) and a higher temperature of that air.

Last edited by swilk; 01-08-2013 at 01:20 PM.
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Old 01-08-2013, 04:09 PM   #22
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Should provide much better comfort.
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Old 01-09-2013, 01:44 PM   #23
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I went ahead and sent an email to Goodman asking them for clarification on the constant fan speed and will let you know what they say.

I went through the documentation of the condenser (DSZC160241A) and it says low stage cooling is 15000btu and high stage is 24000btu. Even if the constant fan speed is 480cfm that is just a tick under 400cfm per ton of heating.

Cooling will be a different story as the low stage cooling is listed as 18700 .... so 480cfm is only about 308cfm per ton. I would likely have some issues with that I would think.

Does the fact that the package I got has a 3ton coil make any difference? The coil is a Goodman CAPF3642C6.
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Old 01-09-2013, 01:54 PM   #24
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CA*F3642*6D* (coil)
MBVC1600**-1A*+TXV (air handler)
DSCZ160241 (Outdoor unit)

24,000 (high Stage cool) 18,700 (low stage cool) 16.0 (SEER) 12.5 (EER)

TVA RATINGS: 22,200 (total) 18,900 (sensible)

24,000 (high stage heat) 9.5 (HSPF) 15,000 (low stage heat) 800 (CFM)

From the Goodman documentation on their website.
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Old 01-09-2013, 04:29 PM   #25
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480 is ok for 1.5 tons. Won't be able to run the indoor temp down to 66 when its only 70 outside.

Thats a coil rated for 3 or 3.5 tons. Will help a little.
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Old 08-13-2013, 04:04 PM   #26
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A late summer update.

The system has worked perfectly all summer long.

The upstairs is the only area that needs a little additional tweaking .... the t-stat is mounted on a wall shared by the hot attic space and even though it is insulated on the back side it suffers from heat soak and reads a few degrees higher than actual temp. I have it set for 75* and the t-stat will read 78 or so when the actual temperature in the room is closer to 68*

I will go in the attic when the temperatures are cooler and see what I can do about it.

The good news is the upstairs is very cool even with a single stage running.

The system overall cools very well. I am not sure the second stage has come on more than a couple times all year.

My electric bills are much cheaper than recent years ..... I like to sleep in a cold room so in the past my AC was forced to cool the entire house during the night time hours. Now with a second unit and a separate zone I can cool just our bedroom. Last months bill was $105 cheaper than same month last year.

Entire system is whisper quiet (condenser start up is the exception) and cools effectively and efficiently.

Happy.

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Last edited by swilk; 08-13-2013 at 04:07 PM.
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