how to change fan speed on a trane furnace how to change fan speed on a trane furnace

video below! Black: High; Yellow: Medium-high ; Blue or brown: Medium-low; Red: Low; Options are, for example, 4 minutes at 80%, or 30 seconds at 50%. Blower on delay settings, which evidently have an impact on the duration and speed of the blower fan. To start, ECM stands for Electronically Commutated Motor which means that the motor is capable of electronically controlling it's own speed, and therefore CFM, according to the desired output. I hope this helps you understand how to adjust the airflow speed on ECM Blower Motors! homininet 8 mo. I'm in the process of re-wiring my blower to run on high with the furnace. 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. I know I need to replace a dying blower motor in a 1992 Trane . I'd like to get some second opinions. Thanks for all your continued support! The blower energy draw at a lower speed will be offset by the loss in fan wheel inertia. Helm is an accomplished DIY craftsman. Remove the air handler. BarnArtist, locate the wiring schematic on your furnace. I'm also a little concerned that this furnace might be a little undersized for our house (if I understand correctly, its a 100 BTU unit). I think the best bet would be to actually test it for a few months and see. Yes, there is a way to bring up the speed on the air handler.. Yes: you will save electricity costs by running your blower on low. 3 of the wires will likely terminate with just a twist on cap. To clean a reusable filter, remove the filter from the air cleaning device. You may freely link to this site, and use it for non-commercial use subject to our terms of use. The heat exchanger can be overheated and burned out if the blower does not remove enough heat. Western VA. Nov 28, 2009. This lower blower speed enhances Comfort R should be off if you are using . 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. @Dave: Those were my thoughts as well. When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. How does a furnace work? I was reading the Trane XL824 thermostat installation and setup manual. He maintains fruit and nut trees along with helping his wife with a vegetable garden. You will need to look at what the programmed speed designations are for M1/M2/M3/M4/M5 on the wiring diagram of the HVAC unit. 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. Air filters are typically found behind the return vent door, often located in the ceiling or wall in the central portion of your home. You need to find the wires that determine blower speed inside your furnace. 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. Which thermostat wires control the furnace fan? In the pictured example above, if the #5 speed tap is programmed for 1600 CFM and #4 is programmed for 1200 CFM and #5 is presently connected to the "Cool" terminal on the control board via the black wire, we know that the unit is running at around 1600 CFM as long as the TESP across the unit is not too high. I simply am unable to put my hands on the schematic. Switch the power back on and test it. In support of this: I found the mfr owner's manual for my furnace and in it, it states, "if you have an air-conditioning coil installed, you should switch the furnace blower speed to high to accommodate the decreased air-flow caused by the cooling coil in the plenum.". *NOTE* If you attempt this, be absolutely sure that you have no power going to your system, especially before changing wires. AC Service Tech HVAC Training is made possible by continued support from our visitors, customers, and support from these Sponsors! But you will have a tough time measuring either on your basement Trane. Because the slower air velocity over the heat element is transferring fewer BTU units into the circulated air and they simply go up the exhaust pipe. Secure the old speed wire by twisting a wire nut over the end. These adjustments can be made by pulling the single wire connector and moving it to another single tab positioned horizontally in each row. DoItYourself.com, founded in 1995, is the leading independent home improvement and repair website. The installation instructions for this furnace are needed in order to be able to know how to set these dip switches. . Now, I haven't done the measurement to learn how much electricity my blower uses on low vs high. On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. (Trust me, the worst thing that happens to me on the job is having inconclusive results due to insufficient data collection during an expensive and time-intensive study.) A 1.5 ton AC unit may not be large enough to cool the . XB Trane Furnace: Is there a fan speed control on the unit. She has experience researching and creating a wide range of home improvement and garden projects, and especially enjoys learning about fireplaces and exterior design. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. Home House & Components Systems Heating & Cooling System Air Conditioners. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. Run a jumper from "R" to "Y2" and the blower will run continuously at the second-stage cooling speed. One thing I found consistently was that making changes on the RS-485 hydro heat control board and W1-W3 jumpering had notable effects (more CFM's at my test register) while messing with the mainboard DIP switches had little to no effect. (Variable & Multi-Speed Types), In this HVAC training article, we will be discussing how to adjust the fan speeds on an indoor, In order to measure air flow you could use a flow capture hood, a rotating vane anemometer, or a, I hope this helps you understand how to adjust the airflow speed on ECM Blower Motors! Solution: Install a new sequencer AND a new fan relay, just to be safe. in this thread in this sub-forum in the entire site. A dirty air filter can cause your HVAC system to go into overdrive and result in costly energy bills. Recently I did a blower speed adjustment on the 2nd floor air handler and thought to show how it can be done. He farmed commercial garden produce for several years. Note also that there is always just "one blower" but that blower may or may not be variable speed, etc. Click On under Emergency Heat. allows the furnace's circulator blower to operate at a slightly lower speed (85% of desired speed) during a combined thermostat call for cooling and dehumidistat call for dehumidification. charts are usually found on the air handler inside door to controls. When the summer air conditioning season transitions to the fall heating season, increase the blower speed by switching the wires on the cool and heat terminals. The factory may only set two or three of these colors as actual speeds. Adjusting the Airflow Speed on ECM Blower Fan Motors! Fortunately, theres a simple fix if you look at your furnaces Integrated Furnace Control (IFC) board. Select your preferred wire with the warm temperature and connect it to the 'heat' port. The MERV scale rates filters from 1 to 16. Most require that you open a box (2 screws?) Most of these are on the bottom left of the control board. to this site, and use it for non-commercial use subject to our terms of use. Various advertisements for variable speed high efficiency furnaces call them "more energy efficiency" (note also the difference between a variable speed blower and a high efficiency furnace, they're separate, for instance you can have a variable speed blower on a low efficiency furnace). If you have a plug instead (ECM Broad Ocean) you can only make the adjustment at the control board or at the plug terminals at the end of the wiring. Most homes have a standard split-system air conditioning unit with two main fans. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? The company offers a variety of furnaces to suits the needs of every home. Narrowing that hysteresis loop will: Leading to a smaller Hysteresis loop, increasing motor efficiency by reducing iron eddy current losses. You should now see a red E icon in the System Mode screen next to Auto and Heating modes. On my furnace the schematic showed there were three speed settings. 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. Does lowering the blower speed of a forced-air furnace lower its efficiency? There are several tutorials on Youtube about how to do this step for specific inducer motor brands. How to use Slater Type Orbitals as a basis functions in matrix method correctly? Remember that CFM stands for Cubic Feet Per Minute. Top Ten Interview Tips to Land that HVAC/R Job! On this control board, there are multiple adjustments for the airflow speeds. According to the company, the slower circulation speed reduces energy consumption by 75%. When one of the taps is powered with 24v, the motor will turn on and run at the selected speed. For 240v units, both the L and N are hots. The constant air turn over at a lower set point keeps the house comfortable. The air handler houses the fan and fan motor and is usually located in the basement or attic. 10 Reasons a Blower Fan Won't Start in a Furnace, AC or Heat Pump. You will need to find the main cover panel on your fan. This can be done through an independent dehumidistat or through a thermostat's DEHUM terminal (if available). These blower motor versions can be found in furnaces, air handlers, and packaged units. I Tried a Hands-Free Dog Leash, and I No Longer Dread Walking My Dog, This Simple Trick Can Refresh Your Entire Home, 30 Spring Cleaning Tasks to Add to Your Checklist, Do not Sell or Share My Personal Information. If the blower motor is burned out, replace it. If you have suggestions or comments they are welcome. So How Do We Adjust Fan Speed? With a one-gallon-per-hour burner nozzle that saves me AT-LEAST 30% on fuel oil plus another 20-30 min of blower run time or at least 30-50% run time savings. I just moved into a house with a Trane XR80 furnace (several years old). This means that any time cooling is called for by the control board, 24v will be present on the #4 terminal of the motor module to turn the motor on and to run at roughly 1200 CFM. I think I had it on my hard drive, and the hard drive crashed on us last winter. Does Nest utilize all the benefits of a communicating furnace, Low speed furnace fan blower motor will not shut off, How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace. How to change the fan motor speed on a gas furnace grayfurnaceman 148K subscribers Subscribe 190K views 10 years ago Furnace blowers A description of how to change motor speeds with a. Running your furnace fan all the time isn't exactly a bad thing. View our Privacy Policy here. Website operating PSC - The Permanent Split Capacitor Motor is still the most commonly used. I understand the reason for slowing the air to remove humidity. For this reason, pair your Variable Speed AC unit with one of the following components: Hyperion TAM9 Air Handler, XC 80 Gas Furnace, XC 95M Furnace, or S9V2. I have a Trane XV90 propane furnace with a variable speed blower. 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. No problem with the boiler. Its a common occurrence in the heat of the summer or the cold of the winter one room doesnt get as warm or as cool as the others. If there isnt one in your home, turn it off at the breaker box. CFM stands for "cubic feet per minute." I suppose I probably won't do so it, but out of curiosity what kind of downside might one run into? So I continued to play around with different combinations tonight. I got the sv96 100k btu 2stage furnace with variable fan and the xl18 4ton ac unit. This will show what speed each numbered tap is programmed as. Mutually exclusive execution using std::atomic? I am currently heavily invested in studying and learning the subject as I commit myself to reducing my winter energy costs this year. I have posted an inquiry under the Air Conditioning forum. In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. However, during the time period while the compressor is not engaged I need to circulate more air on the second floor or it becomes stale. How can I check before my flight that the cloud separation requirements in VFR flight rules are met? -The "AC/HP CFM Adjust" is the airflow volume to be set for system, efficiency, comfort. However, a higher MERV rating may not be best for your system. For instance, here's the procedure to change a furnace's fan speed with a PSC blower motor: Use a multimeter to measure the resistances of each speed wire. The fan speed is very low when not heating/cooling. I needed to go the opposite direction and increase fan speed. In other units, it may be 2, 3, and 4 that are programmed. For homeowners who want to upgrade rather than replace an existing furnace, Emerson Electric offers an exclusive replacement blower motor called the Mark Z that can be set by the homeowner on a continuous, slower-than-normal speed. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The constant torque/multispeed motor will have the smallest module. Since I first posted this thread, my installer called Trane to get an answer to my original question. Possibly you could do the same here (turn down blower and gas). What sort of strategies would a medieval military use against a fantasy giant? But I'm reasonably sure it uses less to run on high vs low then it uses to run on low vs OFF. There are two types of fan motors found in furnaces: 1.) During "Fan On", the fan runs at 50% of whatever the maximum speed of the fan is. He has been DIY since childhood and is now a septuagenarian. Can I retrofit a 2-speed or variable speed blower on a Payne PG8UAA forced air furnace? 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. Proper duct sizing can resolve the issue you are having. Switch the Jumper On most control boards there will be a jumper that is marked to show that it controls the speed. Shay Tilander is a senior editor at Family Handyman. The following list refers to each adjustment starting from the bottom and moving upward. There is no humidistat. For business related inquires email us at info@acservicetech.com. Batch split images vertically in half, sequentially numbering the output files, Using indicator constraint with two variables. The fan speed is controlled on the control board for the furnace. Has anyone done this and can anyone give me a reason why I shouldn't do this? 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. In fact, there's no need to worry about the fan wearing out or breaking down because it's designed to run continuously, and there's an array of benefits connected to this. Wires from the 16 pin plug are connected to this board. According to the manufacturer's documentation, your furnace should have a 3 or 4 speed blower motor. You may freely link For more information, please see our 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 . The SW2 indicates the air conditioning size. That said the contractor has no real incentive to get it right. The system also accounts for blocked vents and dirty furnace filters, and adjusts fan speed as needed to compensate. You could also use the Temp Rise Formula which you can learn about in our "HVAC Temp Rise Formula used to Measure Airflow CFM" video. Check out our free Quizzes to test your knowledge here! Variable Speed Blower Motor ( Genteq 2.3, 16 pin connector). When your AC unit is working properly, the blower inside your furnace or AC will blow cold air.The cold air is sent through ducts to the living areas and then returns air to be cooled by the evaporator coil. In my searching I have found out that there is a stupid little thermistor that burns out on the motor circuit board (it's a variable speed blower), and replacing it is a permanent fix.. The best answers are voted up and rise to the top, Not the answer you're looking for? This is NOT a user servicable item. 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. The blower is set for 400 cfm for a 4 ton outdoor unit, and comfort-R is not enabled (all factory).