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Furnace runs high, AC does not

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RUUD Silohette II Furnace Tappan Condensor Unit- Model FS3BA-024KA (2 Ton) Here is my current issue. Bought this home 18

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Old 10-04-2008, 05:07 PM
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Default Furnace runs high, AC does not
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RUUD Silohette II Furnace
Tappan Condensor Unit- Model FS3BA-024KA (2 Ton)

Here is my current issue.
Bought this home 18 months ago
Newer furnace and condesor unit.

During the winter, Furnace can warm the house very quickly and efficently with a large amount of air moving thru the registers. During the summer months when we run the AC, it struggles to cool the house at all, with very little air flow from the registers.

I asked a buddy, he had me check to make sure the wiring had both Furnace and AC wires on the high speed for the blower and when i checked they were. Any suggestions on how to alliviate the problem with little air flow while using the condenser during our summer?

Brian

Need more info, ask, Im new to this forum, and not very versed in HVAC

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Old 10-06-2008, 05:59 AM
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Default Re: Fan Speed

The A/C should be wired for high speed, and the furnace should be wired low speed. If this does not help you need a fan control center.
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Old 10-06-2008, 03:43 PM
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So if the AC is currently wired on high, i take it i need a blower control?
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Old 10-06-2008, 04:52 PM
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No. Wire the A/C to high and furnace to low. If problem still exists change Amazon.com: Honeywell 90-113 Fan Control Center R8239A1052 Relay: Home Improvement
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Last edited by icehouse : 10-06-2008 at 05:23 PM.
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Old 10-07-2008, 04:30 AM
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Here is the wiring information.

http://customer.honeywell.com/techli...0s/60-0583.pdf
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Old 10-08-2008, 08:32 PM
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You should have a fan relay on the unit mounted on top of the fan center. The low speed is red and high is black . Common is usually purple or white. I would venture to say the wires are reversed on that fan relay.A dang Ruud ain't that complicated.
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Old 10-09-2008, 08:18 AM
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Quote:
Originally Posted by SublimeMasterJW View Post
You should have a fan relay on the unit mounted on top of the fan center. The low speed is red and high is black . Common is usually purple or white. I would venture to say the wires are reversed on that fan relay.A dang Ruud ain't that complicated.
To you and I no, to a DIYer yes.
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Old 10-09-2008, 04:24 PM
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Quote:
Originally Posted by icehouse View Post
To you and I no, to a DIYer yes.
Yes to me, but wiring is no problem for me, ill look into it.
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Old 10-22-2008, 11:19 AM
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Default Suspect, Transformer

In my experience this problem is most likely the low voltage transformer located primarily in the furnace. when the transformer is shorted the fan relay will close on hgh speed and will provide heating when called for by the thermostat but will never provide the 24 volts necesary to change the furnaces motor speed or energize the contactor for the condensing unit, thus no cooling.
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Old 10-22-2008, 06:27 PM
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Question ? How can the fan relay energize if the transformer is shorted ?
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