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Would this cause a constant fan running in attic

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Posted on Jan 02, 2017

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

Wiring a master flow PT6 thermostat to attic fan


I had a roofer install Master Flow PRO 3 and he did the initial wiring incorrectly. The black wire pairs were incorrectly connected and caused the fan to run 24-hours. I switched the black wires pairings and the fan shuts off if less than 100-degrees (the setting I chose) and comes on if more than 100-degrees. You may want to be sure that the black wire from the power source is connected to the black wire for the thermostat (black wire nearest the thermostat setting switch and closest to the power source wire). The black wire from the fan motor should be connected to the black wire closest to the fan motor's wire.

Aug 01, 2012 | Cars & Trucks

1 Answer

This is a Unico AIR HANDLER in a residential application with heat / cool unit in the attic. With system off (not calling for cool) and fan in auto mode, the blower fan is on high speed only constantly....


Sounds like a sticking relay. You can check the stat simply by remove the faceplate. If fan still runs with tstat cover off its not the stat. Not sure is your blower has a separate relay or if relay is mounted on control board. This can be bypassed with a new relay if you are willing. Good luck!!

Mar 26, 2017 | Heating & Cooling

1 Answer

12000 btu air conditioner is brand new but ices up when turned on. Presently it is used in an attic room that is 15x15 sq.ft. Any suggestions/solutions?


thins that can cause an a/c to ice up
1 something blocking the return air to the system (dirty filter, something in front of the unit blocking the incoming air )
2 defective thermostat keeps the unit running past the desire temperature system does not cycle off and ice begins to form.
3 low refrigerant charge this causes the unit to run constantly and the room never cools off ice also begins to form.
4 defective blower fan this is will prevent the air from circulating pas coil and ice will form.
I HOPE YOUR SOLUTION IS SIMPLE.. IF THE UNIT IS NEW IT SHOULD BE UNDER WARRANTY GET IT REPLACED THERE IS NO POINT IN GETTING IT REPAIRED IF YOU JUST PURCHASE IT.

BEST OF LUCK

Jun 01, 2011 | Sharp AF-R100BX Air Conditioner

1 Answer

No power to ac unit


Hi,
Check the breaker for the unit or check to see if the disconnect by the unit in the attic has fuses that may be blown.
If the breaker is tripped or the fuses blown, then check to see what caused them to blow...

heatman101

Aug 01, 2010 | Bryant 463AAC008BA Air Conditioner

1 Answer

Concern of fan turning on and off to often


You have to set the thermostat due to the weater at that time. the main time is summer to blow out heat so set it higher to avaoid on and off situations.

Apr 09, 2009 | Dryers

3 Answers

Dayton Attic fan running backwards


First see if the switch has a reverse position. Sometimes you turn the fan assembly in the frame, sometimes you turn the whole frame around. Take the cover off the wiring compartment to see if there are instructions there. Also check on the name plate on the motor, there may be instructions there. Attic fans are usually engineered to blow out.

Aug 02, 2008 | Dayton (2C373) Fan

3 Answers

Blower in Attic not running


inside unit has fan control relay , either on control board or can be separate ,except for the 24 volt transformer and the t-stat the units operate separately concentrate totally on the inside unit this is where the problem lies

Oct 23, 2007 | Ruud UAMB Air Conditioner

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