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Old 04-10-2011, 10:27 PM   #1
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American Standard Allegiance A/C


I turned on my Amer. Stan Allegiance A/C unit for the first time this season and it won't cool. Here The unit was installed in 1999. Here's what I see:

1. The condensing unit has power and the fan is operating.

2. Visible portions of the coolant fittings and line on or near the condenser unit become covered w/ ice after the unit is on for a short period of time.

3. The main blower fan in the furnace unit does not operate.

4. This winter I had a problem w/ the furnace unit not heating. A limit switch failed due to a dirty furnace filter. Fixed the switch and the unit heated the rest of the season.

Any ideas what is occuring. I assume the cooling portion of the system does not need to go thru a "safety" sequence similar to the heating system. Is this a bad blower motor? Thanks for any advice.

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Old 04-10-2011, 10:48 PM   #2
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American Standard Allegiance A/C


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Originally Posted by pbrjtr1 View Post
I turned on my Amer. Stan Allegiance A/C unit for the first time this season and it won't cool. Here The unit was installed in 1999. Here's what I see:

1. The condensing unit has power and the fan is operating.

2. Visible portions of the coolant fittings and line on or near the condenser unit become covered w/ ice after the unit is on for a short period of time.

3. The main blower fan in the furnace unit does not operate.

4. This winter I had a problem w/ the furnace unit not heating. A limit switch failed due to a dirty furnace filter. Fixed the switch and the unit heated the rest of the season.

Any ideas what is occuring. I assume the cooling portion of the system does not need to go thru a "safety" sequence similar to the heating system. Is this a bad blower motor? Thanks for any advice.

The indoor fan is not blowing in cooling so the system is freezing up but will it, the indoor fan, come on if on "fan" only or while in heating mode?

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Old 04-10-2011, 10:53 PM   #3
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American Standard Allegiance A/C


Bad blower motor , capacitor , blower control or the thermostat not energizing "G". Need to check with a meter to find out which.
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Old 04-11-2011, 08:09 AM   #4
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American Standard Allegiance A/C


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Originally Posted by Doc Holliday View Post
The indoor fan is not blowing in cooling so the system is freezing up but will it, the indoor fan, come on if on "fan" only or while in heating mode?
No, the blower fan will not come on. Bad blower fan?
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Old 04-11-2011, 10:37 PM   #5
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American Standard Allegiance A/C


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Originally Posted by Marty S. View Post
Bad blower motor , capacitor , blower control or the thermostat not energizing "G". Need to check with a meter to find out which.
What do you mean by thermostat not energizing "G"?
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Old 04-11-2011, 11:21 PM   #6
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No, the blower fan will not come on. Bad blower fan?

More than likely, yes.
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Old 04-12-2011, 12:14 AM   #7
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American Standard Allegiance A/C


Quote:
Originally Posted by pbrjtr1

What do you mean by thermostat not energizing "G"?
Take your thermostat off. Take the wire thats connected to the "g" terminal, and connect it to the wire thats connected to the "r" terminal. G is fan and r is power. The fan in the furnace should come on. If the fan in your furnace does not come on, then air does not blow across the indoor coil, causing the heat in the air not to transfer into the refrigerant, thus allowing the indoor coil to ice up, and the suction line to ice up as well.

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