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Old 03-28-2012, 10:59 AM   #1
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Fan speed slow in ON position


I have an Amana 16 SER unit. When I select fan ON with heat and cool Off the unit has very little air flow. During normal heat and cool operation air flow is fine.

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Old 03-28-2012, 12:41 PM   #2
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Fan speed slow in ON position


Any model numbers, particulary of the thermostat would help. Some of the newer high end Goodman & Amana systems have three different Fan Only speeds selectable thru the tstat if it's a communicating setup, and you might be able to increase the CFM this way.

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Old 03-28-2012, 05:14 PM   #3
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Fan speed slow in ON position


Is it a VS blower?
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Old 03-28-2012, 06:34 PM   #4
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Fan speed slow in ON position


sounds like a variable speed air handler/Furnace and would be normal if that were the case.
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Old 03-28-2012, 07:34 PM   #5
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Fan speed slow in ON position


Mine runs at 35% when in Fan mode. There really is no need to run in fan mode, unless you are trying to move air due to smelling musty.
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Old 03-28-2012, 08:53 PM   #6
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Fan speed slow in ON position


I have had the unit for about a year. The house was foamed during construction and will create warm spots in the house during warm months or air conditioning on. The thermostat has a recirculate setting (about 20 minutes every hour fan on) but the speed is so slow there is almost no air movement. Talked to service guy today and he says if the speed setting is changed it will decrease the units efficiency.
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Old 03-28-2012, 08:57 PM   #7
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Fan speed slow in ON position


Won't hurt the units efficiency.
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Old 03-28-2012, 08:59 PM   #8
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Fan speed slow in ON position


My thoughts also. I feel there is a setting in the control board that will change the fan ON speed.
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Old 03-28-2012, 10:05 PM   #9
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Fan speed slow in ON position


Quote:
Originally Posted by Ron Peeler
My thoughts also. I feel there is a setting in the control board that will change the fan ON speed.
If you post the manufacturer and model numbers of the equipment, then everyone can be better in helping you. As for the warm spots, what they really are, I'd you body sensing the non air movement. If you have adequate air circulation with the proper air returns, you should not have this. Also, after the spray foam, did they do a blower door test to tell you what the air exchange rate is now?
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Old 03-29-2012, 11:27 AM   #10
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Fan speed slow in ON position


It is an Amana 16 SEER 3 ton unit about a year old with variable speed air handler. Didn't want to get into the exacts but wanted to know if the On fan speed for a variable unit could be changed? Warm spots are from no air movement in the house is correct. The warm spot is in my bedroom at around 3:00am in the morning. Once the house is cooled for the night setting, starts about 10:30pm the unit normally doesn't come back on until well past 8:00am. Everything else works fine and satisfied with the efficiency with the unit.
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Old 03-29-2012, 02:02 PM   #11
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Fan speed slow in ON position


Ron: "Didn't want to get into the exacts but wanted to know if the On fan speed for a variable unit could be changed?"
How do you expect someone to comment with the "exacts"?
Like "it is a car, how to you fix the system in it?" There are all sorts of different models within a mfg much less between brands and controller boards differ widely.
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Old 03-29-2012, 08:05 PM   #12
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Fan speed slow in ON position


Air handler model number would tell us which one it is. And then we might know if it can be changed. many can, some can't. I don't know which one you have to know either way.
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Old 03-29-2012, 08:15 PM   #13
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Fan speed slow in ON position


I have found the installation manual for the Amana MVC950704CX and in the Fan Only Mode the circulation blower is energized on continuous fan speed (30% of furnace's maximum airflow capability) following a 5 second delay. I can find any references that would indicate this speed could be changed.
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Old 03-29-2012, 08:30 PM   #14
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Fan speed slow in ON position


Need the comfortnet thermostat to do it on that model.

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