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I have a york hvac system that is 5 years old. I have the thermostat set at 74 and when it turns on only the fan runs circulating the existing air in the house about 20 percent of the time. The a\c works great when it is running but i'm wondering why it doesn't always come on. Just replaced the thermostat thinking that was the problem but it did not help. Sometimes after the fan runs for a half hour or so the a\c will finally kick in and start blowing cold air. The lines are not frozen at any time during this time. The outside fan has always run during this time also. Is there something wrong with the compressor? Any advise would be great

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It sounds to me like you have a delay on start timer on the compressor that possibly is starting to fail or someone may have adjusted the time band up on it. I myself would remove it and install a delay on break timer and a 5 minute setting would be ample time.

Hope this helps Ya

Posted on Jul 13, 2008

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The fan on one my central heating and air unit won't come on? It was working fine when I went to bed at 1:30 in the morning and when I got up around 7:30 this morning it wasn't running anymore.My house has...


Running the equipment on 72 degrees would cause the compressor and fan to work harder on hot days. This will definitely place more strain on your capacitor. These capacitor problems usually happen on the hottest days. I would suspect the capacitor, not the fan. I'm an HVAC tech, so I would Check both with my multimeter

Aug 25, 2013 | Heating & Cooling

Tip

Honeywell TH8320U Thermostat


The Honeywell Vision Pro 8000 Digital Thermostat is a fully programmable thermostat that is so easy to use that you might think that it is reading your mind as you work with it.

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This intuitive logic responds to you as you program this thermostat and helps you to do what you wan to do. The instruction manual almost becomes a thing of the past. This thermostat also will learn your building and HVAC system. It then adjusts to keep your temperature within 1 degree F of the set point. This will give you the best in comfort. The comfort is achieved while still giving you the very best is efficiency. In some cases efficiency has been increased by up to 30% by simply installing this thermostat.

The fan can be programmed separately for increased comfort when running an electronic air cleaner or a humidifier. A 35% circulator mode is also available. Hold options will let you easily go on vacation or temporarily override the programmed settings. The vacation setting will even let you set it to go back to the schedule before you get home. There are also built in reminders for many of the things that need scheduled maintenance.

If you are thinking about or have a dual fuel set up or a heat pump furnace set up, then this is the thermostat for you. With the addition of an outdoor sensor you can set the thermostat to switch from one heat source to the other at whatever temperature you set.
This feature will eliminate the need for “change over kits” extra relays, etc… when you are setting up a system that has a backup heat source.

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This thermostat will also allow you to run it from the power of your HVAC system or run it on battery power. Just hook up the common wire and the thermostat will run off of your HVAC system. The changeover of the unit from A/C to heat can be programmed to be either manual or automatic. Scheduling of the program can be done in many different ways. You can decide between 1 day, 7 day, 5+2, or 5+1+1, day. Four periods, 2 periods per day or nonprogrammable are all options also.

The keyboard can be locked completely or partially. With the purchase of additional sensors you can wire up remote indoor sensors. These can also be wired to average the temperature is you want to sample the temperature from more than one place. An outdoor sensor can be installed so that you can see from your thermostat the outdoor temperature.

A five year manufacturers warranty is standard and you will also get a thermostat that has earned the energy star rating.

http://www.fixya.com/support/r3869033-replacing_thermostat


http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

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1 Answer

Heat Pump - blows heat to set temp, then off, then kicks on to blow cold


Heat pumps defrost which is the AC mode, if the heat strip isnt working during a defrost, the air will be cold, A heat pump only feels warm if the heat strips are on too! the refrigeration cycles heat output is much less sensible to our 98F skin. heat pumps that satisfy a room setpoint are working at least, all heat pumps feel drafty to most.

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jumper red to yellow on thermostat if it kicks on problem is in the thermostat.

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I have a new Carrier HVAC system with a fancy EDGE thermostat. When I turn the system OFF at the thermostat, and set the fan to AUTO, hours later I will find that the fan is running and it's setting on the...


1. Open the door. 2. Press and hold the buttons underneath the heat and cool setpoints simultaneously (the two bottom buttons on the right) until the screen displays the reset reminders and 01 in the lower right corner. 3. Press the up arrow button until 01 changes to 07 with OF (fan mode) next to it. 4. To turn the fan on, press the rightmost lower button then press the up arrow button until the screen displays ON. To turn the fan off, press the rightmost lower button then press the down arrow button until the screen displays OF (off). 5. Press the done button. 6. Close the door.

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I recently bought a 4 ton 14.5 SEER Rudd Spilt system using R-410 and matching Rudd furnace. This system replaced a Lennox 10 SEER 4 ton unit. Now that it has gotten hot in Baton Rouge LA 90-93 degrees....


Sounds like the Unit might be low on charge.But without correct readings not sure.
The new unit with 410 will actually cool better due to higher boiling point temp. of freon type.Poor air circulation could also cause problem.Such as dirty filter, too slow fan speed,dirty coil.Also could have obstruction in freon lines either at pump,in line set,or in coil.
Get someone u trust to check it out and ask for their Rudd Dealership Training Credentials.

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1 Answer

HVAC issues - A/C blows semi-cold air and Heater won't turn on


hi! there,
there are possible cause in the circuit is the thermostat,since thermostat switch is like a switch of light,when this turn on blower and compressor turn on,if you turn on and no cold your thermostat
is defective.replace thermostat,if run but insufficient cold was feel check the operating current,there is a rated current you can compare it can tell if your freon charged is under charged,this should be done by certified service technician from your service center,have inform from your manual the telephone no. and location have it call.if still under warranty claim it have a nice day.

May 15, 2009 | Heating & Cooling

1 Answer

Fan keeps running.


Some programmable thermostats have a circulate feature. This feature will allow your fan to run approx. 20 minutes per hour. This will insure better circulation, a better balanced temperature throughout the home & better air quality do to more air filtration. Read your thermostat manual to see if your thermostat has this feature and how to turn it off if needed. Another possibility would be on an older furnace with a fan limit control. If the temperature settings are set to low on the fan limit (or if the control is malfunctioning) you could experience a fan that runs a lot even if the thermostat is off.

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1 Answer

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