Question on Trane XV95 2 stage furnace
Hi, I am new here and have a question. Recently had a Trane XV95 2 stage furnace installed. Had our first cold snap this week so this is the first it's kicked on. I remember the installer saying with this model it is best to leave the fan in continuous ON position, opposed to AUTO. I tried this yesterday for the first time, and when I came home the house felt very cold. Seems like all the fan was doing was blowing cold air around all day. So I put the fan back on AUTO and let it kick on and off through the night. I am curious to hear if others who have this model leave the fan running all the time and what is the advantage/disadvantage. I have a very small 4 room house. Thanks. There are quite a few variables that come into play as to whether or not continuous air circulation is a good idea. If you are using a setback thermostat (or you manually set back the thermostat) or if you have any ductwork in a non-heated space then continuous air circulation is probably not going to be a good idea. With a two stage furnace, the blower runs as a slower (and quieter) speed while its on first stage, then switches to a higher speed if and when the furnace goes to second stage. When you leave the fan in the continuously on position, it always runs in high speed, which is noiser and since there is more airflow, the air coming out the vents is cooler when the furnace is firing on first stage. I'd recommend leaving the ran in the auto position and letting the furnace pick the appropriate fan speed for the stage it is operating in. I have a two stage furnace myself, and I always leave it in the auto position, as the fan operation in the slower first stage is quieter and more economical. I have my fan on all the time in the winter, no issues with the cold air. the air flow is soft, I don't have the drafting feeling. Our furnace is 6 years old, and the temp are even all over the house. Our house is a split level as well. Also with the fan on, the air is being going though our 4 media filter. If you are getting the cold feeling, you may have a pipe tied into your return and it's drawing in outside air. Do you have this? Thanks to everyone who answered. I appreciate the information. As far as having a pipe tied in to my return drawng outside air, I honestly don't know. Will have to find out. Thanks again. Go around your house, look for a hood larger than a dryer/exhaust fan good. Most of the time, it's a 6 pipe. In older homes it was a common thing back in the days. They don't do it much anymore now days, it's either air to air exchanger, or pipe is dumped next to the furnace/water heater. Jay, I do not have such a pipe. Only pipes coming out of my house are the two associated with this new furnace. The original chimney in this house was removed years ago. Old furnace was vented out of the side of the cellar too. This is a very old house, over 100 yrs. Not air tight. I am sure cold air is getting in through cracks and crevices. We tried to seal as much as we could. Thanks for the info And it being that old, you may not have much if any insulation in the walls, so the cold air is being stirred up more when the fan is ON. Also, do you have A/C? If so, maybe the blower is set too high. My system, I have 2 ton A/C so that moves 800 cfm of air, so the blower runs 50% of the A/C speed setting. (400CFM) of air, just enough to move around, but not noticed a draft. No, No AC. No insulation in the walls plus the age of the home is why it is always drafty. Being that you don't have A/C, we can drop the blower speed down, and see what happens. What's the full model # on your furnace? TUH2B08049V3VAC - (thanks) Ok, Dip switch settings. 1-on 2-on 3-off 4-off 5-on 6-on 7-on 8-off Did the dealer put on a two stage t-stat on this furnace? Yes, two stage t-stat was installed. Double check to make sure there's a wire alone to W1 and W2, no jumper between the two.
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