how to change fan speed on a trane furnace

This control board is out of a variable speed furnace with a modulating gas valve that has a variable speed inducer motor. Western VA. Nov 28, 2009. With heating oil at $4.50/gal I can assure you without measuring anything that running my blower on low is NOT more efficient from a $$ perspective. But, in looking up the manual for this furnace (TUD1B100A9361), it looks like there are 4 blower speeds. At night with an even lower set point I switch the fan speed to automatic. Sometimes less cmf will give the air more time in the heat exchanger thus letting it get hotter. Dealers can answer questions, help you find the right products for your home, and repair your system. There are several tutorials on Youtube about how to do this step for specific inducer motor brands. The noise is there in heat or AC. Remove both of these wires and wire nut them together. Measured the temperature of the air before the coil and after the coil and used DeltaT (change in temperature) to determine the blower setting. I have a Carrier furnace/heat pump with an expensive control thermostat that talks directly to the heat pump. Test the new speed. We also have quick reference cards for use out in the field! Questions of a Do It Yourself nature should be This video is to show how you can figure out the blower speed setup in your HVAC system, and what you can do do adjust said speeds. In the example above, an ECM 2.3 16 pin variable speed motor is connected to an air handler control board. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? If the blower motor hums, check the blower fan to ensure that it spins freely. If it goes out of spec then on "very cold days" (when the furnace runs a lot) it could trigger an automatic shut off when the exchanger doesn't end up getting cooled enough, FWIW. I understand that the higher speed is probably for cooling (for which we have a separate duct system and handler), but is it the case that the speed can be switched to a higher fan speed? Website operating Does that have any impact on the efficiency of the unit? homininet 8 mo. It helps to have over 50 years of farming and ranching experience. I think that when it is in enhanced mode the fan only runs at 50%, you can try changing your dip switches to see. One of these wires will be coming from the thermostat and the other will go to the outside unit. It offers three settings: 525 RPM for saving energy, 900 RPM for heating, or 1100 RPM for air conditioning. I know I need to replace a dying blower motor in a 1992 Trane . If you want to learn about refrigerants and how they work in a system, check out our Refrigerant Charging and Service Procedures for Air Conditioning book . Using a filter that's too small or too large will allow debris particles to pass into the HVAC unit, potentially damaging or blocking the system. DoItYourself.com, founded in 1995, is the leading independent Typically the colors are: White = neutral speed Red = low speed Yellow = medium speed Black = high speed Why is my furnace blower running at low speed? It would have no affect on the Heat settings. I got the sv96 100k btu 2stage furnace with variable fan and the xl18 4ton ac unit. Which thermostat wires control the furnace fan? When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. Switch the power back on and test it. Cut the wire's terminal connector off with wire cutters. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. How to Lower the Ouptut of Oversized Furnace. Usually there will be three "speeds" ranging from 40 to 100% of airflow. Usually, gas furnaces have a temp rise of 50F. I know that it has been done. I'll edit my answer and include the exact parameters I'd record every day for a thorough study. Match the positions to the desired pictures within the manufacturer's installation literature. In order to determine or change the speed, check the wiring diagram of the furnace/air handler/package unit that the motor is installed in. and our So clearly, running your furnace blower on low is only more efficient IF-and-ONLY-IF the cost of the heating fuel is much much less then the cost of the electricity to run the blower that little bit faster. Variable speed furnaces only operate at . Locate the wire for the new speed setting ("medium" or "low"), remove the wire nut from its end and use wire strippers to strip 1/2-inch of insulation from the end of the wire. The arrow should point toward the unit. The control board is communicating with the blower module in order to determine the airflow volume needed. We recommend our users to update the browser. If you remove the common and place it on another terminal, it can burn out your motor not how you want the new furnace season to begin. Connect the black wire to the manometer. In his particular case it was "too much volume" of air so I presume just moving air filters isn't enough (typically you'd need to adjust blower level AFAICT). The best answers are voted up and rise to the top, Not the answer you're looking for? lower efficiency furnace) it is drafting exhaust up the flue which can't be good. Check out www.acservicetech.com/store. One of these wires will be coming from the thermostat and the other will go to the outside unit. Proper returns are rarely a thought. Typical setups include these wire colors with associated blower speeds. Know your limits. Check out our free Quizzes to test your knowledge here! I'd go with logging temperature differential (inside temp - outside temp) vs. energy consumption every day for a month with the blower on high and then for a month with the blower on low. I do know that my entire furnace runs safely on a 15amp breaker with the blower on high, the burner running, the humidifier running, and the water pump to empty the humidifier running. How can I check before my flight that the cloud separation requirements in VFR flight rules are met? If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. She has experience researching and creating a wide range of home improvement and garden projects, and especially enjoys learning about fireplaces and exterior design. (FYI Filter was clean and furnace was recently serviced all prior to my initial investigation of the short cycling). The house cools off quick - too quick - and feels humid (not sure of the rh%). http://www.inspectorsjournal.com/Forum/topic.asp?TOPIC_ID=8998&, We've added a "Necessary cookies only" option to the cookie consent popup. The fan speed is very low when not heating/cooling. Craig creates educational HVACR articles and videos which are posted at https://www.acservicetech.com & https://www.youtube.com/acservicetechchannel & https://www.facebook.com/acservicetech/. Its not advisable to slow your furnace blower speed. This is an old thread but I am going to post my experience: I have an oil furnace, at some point someone (a furnace tech) adjusted the blower to run slower thinking it would provide more hot air by slowing the air to heat up more before supplying the house. The automatic feature rarely kicks in once at set point. Published: 05/19/2021 Author: Craig Migliaccio, About the Author: Craig is the owner of AC Service Tech LLC and the Author of the book Refrigerant Charging and Service Procedures for Air Conditioning. - The "Continuous Fan" refers to when the G terminal is powered for the fan only to run. Not every AC or furnace filter will have an arrow printed on the frame, but when it does the arrow indicates the direction the filter must face. Another key difference is that the circulate . On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. When the humidity is high for what its set at. After understanding what speed each tap is programmed for, we can make proper airflow adjustments. Where To Find R-22 & R410A Leaks on AC Units! Air filters are typically found behind the return vent door, often located in the ceiling or wall in the central portion of your home. The video will also explain other safety measures, as well as some for a demonstration which I will show. Sign up for our email newsletter to learn helpful HVAC tips and tricks before your purchase your system. The heat exchanger warms up the incoming air and a blower or air handler sends the warm air throughout the home. In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. Is it Covered Under Homeowners Insurance or a Home Warranty? Can I retrofit a 2-speed or variable speed blower on a Payne PG8UAA forced air furnace? Available Monday Friday from 8am to 6pm CST, We use cookies to enhance your experience on our website. The only alternative is to raise the discharge temperature. No problem with the boiler. Questions of a Do It Yourself nature should be submitted to our "DoItYourself.com Community Forums". If you want to solve the air noise problem, move the return air filters out of their hallway locations back to the upstream side of the return air duct at the furnace. I'm not completely convinced on this, since the claim is made by a company that sells variable speed blowers for retrofitting HVAC systems. I understand the reason for slowing the air to remove humidity. You can change the settings for cfm fan speed, but you have to do it manually at the board. Usually there will be three speeds ranging from 40 to 100% of airflow. If power is getting to the blower motor, but the motor does not run, the motor may be burned out. A 90 percent-plus furnace needs 150 cfm per 10,000 Btu of input. The NET difference of the above two figures is your savings or cost. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. When one of the taps is powered with 24v, the motor will turn on and run at the selected speed. You need to find the wires that determine blower speed inside your furnace. We have been heating the crawl space in our house for several winters because the ductwork was all torn up from rats. Asking for help, clarification, or responding to other answers. This value is then multiplied by 150 cfm to obtain the required airflow for the furnace in heating operation. Since hot air is much lighter . The gas kicks on and is lit by the ignitor. A MERV rating speaks to the filters ability to capture large particles. These two losses comprise the magnitude of heat losses. Remember that a heat pump in heating mode will need to run with roughly the same airflow speed as during AC mode even though it may not be comfortable for the building occupant. How to use Slater Type Orbitals as a basis functions in matrix method correctly? Third-stage auxiliary heating for heat pumps and multi-stage furnaces. Turn off power at the main electric panel. one room doesnt get as warm or as cool as the others. Yes: you will save electricity costs by running your blower on low. There is no humidistat. If you have an HVACR relatedquestion, drop it in the comment section of one of theYouTube videos at theAC Service Tech YouTube Channel and I will do my best to respond. The noise of forced air is annoying. in this thread in this sub-forum in the entire site. A lower fan speed ensures your heat pump will run for longer periods of time which is required for the system to go into what's called a defrost mode ( watch this video on defrost) Running the fan too high can mean your heat pump will not run long enough in order to kick into a defrost cycle. He also builds custom tools for metal working. I am just clueless, could it be the thermostat (really old) or something that is going to cost a billion dollars to fix? If you do, you may not have enough air flow over the heat exchanger, resulting in overheating and eventually a shorter exchanger life span. low would be 350 CFMs/ton, medium 400 CFMs/ton, high 450 CFMs/ton. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. The air handler houses the fan and fan motor and is usually located in the basement or attic. The main difference is that the fan ON setting means that the fan is set to run as long as the furnace is switched ON. To help ensure you're breathing healthier air and supporting your heating and cooling system to operate at an optimal level, follow the simple steps in this video to change your furnace filter assuggested. Example: Rated Btu Input = 60,000 / 10,000 = 6 x 150 = 900 cfm of required furnace airflow. There is a modification that will allow the VS fan to run on high speed at all times while in the AC mode and with the fan "ON" mode.

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