So if you are actually moving 1250 CFM then you are at 357 CFM/ton, which is a good setup for dehumidifying. Standard blower motors operate at a single speed and cost around $450 to replace, including parts and labor, while variable-speed motors cost $600 and up. 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I would think adjusting the heating element would save more energy than reducing the blower's electric consumption, but I didn't do a study on it myself. If the relay that controls the blower motor fails while it is closed, it will send continuous voltage to the blower motor, causing the motor to run continuously. This value is then multiplied by 150 cfm to obtain the required airflow for the furnace in heating operation. To recap: The service technician might be able to increase (or decrease) the blower speed, but that would probably lower the AC's cooling efficiency. HVAC filters help remove dust, dander, and harmful particles from the air inside your home. (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! I simply am unable to put my hands on the schematic. I know I need to replace a dying blower motor in a 1992 Trane XL80 gas furnace. The gas is shut off and the induction motor stops running while the blower . This will allow you to access the control board. Additionally, they can be identified by the presence of a removable module/bell on the end of the motor. 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. If you have not read that yet, I would encourage you to do so! (Heat transfer wasn't one of my favorite classes in college - I focused more on dynamic systems, sorry.). Switched it to heat (in which case the furnace board is in control of the fan, not the stat) - got fire, no fan. If you really wanted to be scientific, you could perform an experiment and post the results here. This trick only works on gas furnace systems with a multi-speed blower. 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. If you do, you may not have enough air flow over the heat exchanger, resulting in overheating and eventually a shorter exchanger life span. . How exactly could I test this? It was working a week ago but just recently when it runs it blows out cold air. Before you begin this process it is a good idea to make sure that no power is going to the fan. The house cools off quick - too quick - and feels humid (not sure of the rh%). I think I had it on my hard drive, and the hard drive crashed on us last winter. 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. 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 . Sign up for our email newsletter to learn helpful HVAC tips and tricks before your purchase your system. Available from Trane Dealers in select locations. 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. Questions of a Do It Yourself nature should be The system also accounts for blocked vents and dirty furnace filters, and adjusts fan speed as needed to compensate. If the blower motor hums, check the blower fan to ensure that it spins freely. Change the speed. Identify those arcade games from a 1983 Brazilian music video. When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. The blower/fan seems to be running way to fast. The arrow should face the direction the air is flowing. I'm in the process of re-wiring my blower to run on high with the furnace. Can I retrofit a 2-speed or variable speed blower on a Payne PG8UAA forced air furnace? Pollen, dust, clothing and carpet fibers, hair spray, mold spores, Pollen, dust, clothing and carpet fibers, hair, mold spores, legionella, pet dander, Pollen, dust, clothing and carpet fibers, hair spray, mold spores, bacteria, pet dander, cooking oil, most tobacco smoke, smog, Air filters are the first defense against the pollutants in your air, but building a complete air filtration system can help support an even higher quality of indoor air. I'll edit my answer and include the exact parameters I'd record every day for a thorough study. Of course all that heat was lost because of the ridiculous number of vents in our foundation. Yes, there is a way to bring up the speed on the air handler.. AC Service Tech HVAC Training is made possible by continued support from our visitors, customers, and support from these Sponsors! Measured the temperature of the air before the coil and after the coil and used DeltaT (change in temperature) to determine the blower setting. Where To Find R-22 & R410A Leaks on AC Units! with a wiring harness for the fan. In this video, we are changing the blower speed on a Trane XR 95 furnace so that the forced air furnace circulates more air on heat mode. Filters help protect the many parts of your heating and cooling unit from debris and buildup that can shorten the working life of the system. -The "AUX Heat" makes sure that there is enough airflow when elect strip heat is called. Usually, gas furnaces have a temp rise of 50F. The ignitor glows. There are two types of fan motors found in furnaces: 1.) There are often five wire colors coming from your blower to your IFC. We have been heating the crawl space in our house for several winters because the ductwork was all torn up from rats. Based on some randomly googled comments here: http://www.inspectorsjournal.com/Forum/topic.asp?TOPIC_ID=8998& seems to agree it decreases efficiency but may increase comfort [ex: cold spots or noise level] :). Asking for help, clarification, or responding to other answers. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. You will need to find the main cover panel on your fan. Step 3: Adjust the Pulley on the Blower Drive Motor Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Example: 1200 CFM is needed for a 3 ton 36,000 BTU/HR system. By Pressing submit, I consent that my information be shared with Trane approved affiliates and third party partners, including connecting me with a local Trane dealer to be contacted about products and services. 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. No: you will not save on gas/oil costs by running your blower on low. Thanks for the reply. 4TEE3C10A1 That is excessivly loud. The arrow should face the direction the air is flowing. I miscalculated. Variable speed furnaces only operate at . The product data guide, and label on the inside panel indicate the air . If the ohm meter comes back with an open line reading, the switch is bad and needs replaced. Remove the motor and mounting bracket. These two losses comprise the magnitude of heat losses. Motor is an ECM and it makes a low pitched whine sound when in CIRC or when the blower is ramping up or slowing down to stop. Has anyone done this and can anyone give me a reason why I shouldn't do this? 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. 1995-2023 MH Sub I, LLC dba Internet Brands. Thanks for all your continued support! (Variable & Multi-Speed Types) In this HVAC training article, we will be discussing how to adjust the fan speeds on an indoor ECM variable speed blower motor and an ECM constant torque/multi-speed blower motor. You should now see a red E icon in the System Mode screen next to Auto and Heating modes. We are no longer supporting IE (Internet Explorer). I thought of a way to prevent the nasty smell been coming through the vents, keep the cockroaches and rats out, and heat the house without having to go down and repair the ductwork, all at the same time: seal up the foundation vents with insulation and replace the thermostat with a remote bulb thermostat locating the sensor under the house. 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. Most of these are on the bottom left of the control board. For business related inquires email us at. We recommend our users to update the browser. 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). Upon initial installation, these dip switches need to be adjusted for the particular unit, size, and application. A 1.5 ton AC unit may not be large enough to cool the . The furnace operates for two minutes or so before it shuts down. bean. 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. When the R-G circuit is made, the blower motor operates on heating speed. Trane s9v2 should thermostat control blower speed? Top Ten Interview Tips to Land that HVAC/R Job! The Trane XR80's heavy steel insulated cabinet has two benefits: Holds in more of the heat that you pay for Decreases operating noise Because of its heavy steel insulated cabinet, the XR80 can experience as little as 1% of air leakage. But the 'real' one will be the one connected with a twist on cap to the fan motor. All information is provided "AS IS." All Logos & Trademark Belongs To Their Respective Owners, Maintaining temperature over a longer period of time is more efficient than getting a room to temperature quickly, A lower fan speed ensures your heat pump will run for longer periods of time which is required for the system to go into whats called a defrost mode (. A slim, removable cover will reveal the filter location. New XV80 Trane furnace makes noise when blower runs at low speed. The variable speed furnace delivers the proper amount of airflow based on the heating and cooling needs of your home. Well, it does make sense that lowering the blower speed would reduce its electrical consumption. I'm also going to go through and make sure there are no visible leaks or damage to them. - Answered by a verified HVAC Technician . Thanks for contributing an answer to Home Improvement Stack Exchange! In this case, to adjust the blower speeds, move the dip switches (in the red section of the control board) to the positions shown in the manufacturer's installation instructions. maryland_irisman 14 years ago As suggested by the others, you should balance the air flow and the fan cfm should be matched to the system and duct system. You need to find the wires that determine blower speed inside your furnace. First, make sure that power is getting to the motor. If your home has multiple HVAC systems, there will likely be at least one air filter for each unit. However, I like the continually run the fan to even out air temperature in the house. When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. 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. suggestions. The video will also explain other safety measures, as well as some for a demonstration which I will show. 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/. We have a Trane XL80 furnace manual in pdf version that you can download for free. Use dish soap and a soft-bristle brush or sponge to remove stuck-on debris. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. There are often five wire colors coming from your blower to your IFC. A 90 percent-plus furnace needs 150 cfm per 10,000 Btu of input. I hope this helps you understand how to adjust the airflow speed on ECM Blower Motors! I connected a second thermostat to the circuit board to run the blower (R to G). 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. Privacy Policy. It is about 1300-1400 sq feet, but then the basement was finished at some point, more or less doubling the square footage. Other than removing the module and seeing burnt components it must be diagnosed by a professional with a techmate tool ( allows you to test the motor and module and determine cause of error). Typically the colors are: White = neutral speed Red = low speed Yellow = medium speed Black = high speed All rights reserved. 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 recently had have a trane xl 90 want to adjust speed of blower fan blower motor has 4 wires white going to neutral black unhooked blue to high speed yellow to I have a Trane Indoor Air Handler Model No. The wire's color will determine the speed settings that the motor will run at. Yes: you will save electricity costs by running your blower on low. 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. The blower is set for 400 cfm for a 4 ton outdoor unit, and comfort-R is not enabled (all factory). The heat exchanger can be overheated and burned out if the blower does not remove enough heat. Put the air handler back. low would be 350 CFMs/ton, medium 400 CFMs/ton, high 450 CFMs/ton. I have posted an inquiry under the Air Conditioning forum. I was reading the Trane XL824 thermostat installation and setup manual. Which thermostat wires control the furnace fan? Only swap these two wires. 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). Comfort R should be off if you are using . I'm not completely convinced on this, since the claim is made by a company that sells variable speed blowers for retrofitting HVAC systems. Anyone? 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 "AC/HP CFM Adjust" is the airflow volume to be set for system, efficiency, comfort. The air handler houses the fan and fan motor and is usually located in the basement or attic. Its time to clear the air. The SW2 indicates the air conditioning size. Connect and share knowledge within a single location that is structured and easy to search. There are several tutorials on Youtube about how to do this step for specific inducer motor brands. Turn off the emergency HVAC shutoff switch Remove top and bottom cover panels on the air handler / furnace unit (fig.5.1). On this board, pins 3, 4, and 5 on the SW1/1 through SW1/8 dip switch block have to do with air flow. Turn off the power source that is connected to the furnace blower. How to tell which packages are held back due to phased updates, Linear Algebra - Linear transformation question. Options are, for example, 4 minutes at 80%, or 30 seconds at 50%. By clicking '. On this control board, there are multiple adjustments for the airflow speeds. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. Air Filter - Be sure to check the air filter and replace if necessary. The induction motor begins running. There is another way to wire this, but I can not find it back.. If the instructions are not with the furnace, you can look up the model number of the unit and search for the installation manual via a google search. Continue reading to learn how to lower the fan speed. PSC - The Permanent Split Capacitor Motor is still the most commonly used. The blower motor also begins running, but at low rpm. There is no mechanism to change this. (FYI Filter was clean and furnace was recently serviced all prior to my initial investigation of the short cycling). Each is associated with a different blower speed. The higher the MERV rating, the better the filter is at capturing specific pollutants from the air. Remove two screws from each bracket leg holding the motor. The system might not work properly. I needed to go the opposite direction and increase fan speed. Ilook forward to responding to many more! That will give you the most reliable results for your particular system. This covers speed adjustment on a PSC motor. I know I need to replace a dying blower motor in a 1992 Trane . I installed a Thermo Control 2000 boiler and first fired it up this Friday. I just moved into a house with a Trane XR80 furnace (several years old). I've gone through the process of adjusting the manual zone louvres on the main ducts (and on registers) and checked them with my camera for blockages. The wires that are used will determine the speed settings that the motor will run at. The blower fan on this blower has four speeds. When you open the panel, it kills the power to the furnace. According to the company, the slower circulation speed reduces energy consumption by 75%. Proper duct sizing can resolve the issue you are having. 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. For more information, please see our Craig is a licensed Teacher of HVACR, Sheet Metal, and Building Maintenance in the State of New Jersey of the USA. The arrow should point toward the unit. 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. home improvement and repair website. 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. one room doesnt get as warm or as cool as the others. These are not switched off but are live all the time. Black: High; Yellow: Medium-high ; Blue or brown: Medium-low; Red: Low; Yes you can change it, how to do it is in the manual, yes there can be downsides, no it probably won't fix your air balancing issues. 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. It accounts for the amount of air in circulation for precision airflow. Most homes are best served by a filter with a MERV rating of 8 to 13, but refer to your system's user manual or with a Trane employee for guidance. Is it Covered Under Homeowners Insurance or a Home Warranty? Check out www.acservicetech.com/store. On most control boards there will be a jumper that is marked to show that it controls the speed. Press Apply to save and exit. When one of the taps is powered with 24v, the motor will turn on and run at the selected speed. However, they are limited based on the total external static pressure (TESP) in the duct. The factory may only set two or three of these colors as actual speeds. These blower motor speeds are programmed at the manufacturer's factory for the specific equipment model number unit it is installed in. The wires are several different colors. 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. The gas kicks on and is lit by the ignitor. What sort of strategies would a medieval military use against a fantasy giant? The best answers are voted up and rise to the top, Not the answer you're looking for? I think the best bet would be to actually test it for a few months and see. Connect Y2 on thermostat to BK on furnace, and Y2 on the Condensing unit Cut R-BK jumper at Furnace Install R - O jumper at Furnace Connect W2 on thermostat to W2 on furnace (or alternatively, jumper W1 to W2 at furnace and confirm that dip switches are set correctly for Stage Delay if furnace is desired to automatically control heating stages) 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.. It provides quieter and more even and comfortable heat than a conventional furnace and doesnt consume electricity unnecessarily. See our Privacy Policy for more information. If there isnt one in your home, turn it off at the breaker box. My main questions are. *NOTE* If you attempt this, be absolutely sure that you have no power going to your system, especially before changing wires. No problem with the boiler. thanks in advance. . 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. Turn off power at the main electric panel. 10 Reasons a Blower Fan Won't Start in a Furnace, AC or Heat Pump. (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.) Can this be adjusted These blower motor versions can be found in furnaces, air handlers, and packaged units. He owned and operated a manufacturing business building Compact Utility Vehicles for homeowner use. I'm getting a new s9v2. Why do many companies reject expired SSL certificates as bugs in bug bounties? Then switch the jumper to your desired speed. Solution: Install a new sequencer AND a new fan relay, just to be safe. In other units, it may be 2, 3, and 4 that are programmed. Batch split images vertically in half, sequentially numbering the output files, Using indicator constraint with two variables. 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. Should I upgrade to a pcm br compatible thermostat? Any takers? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I have been reading that the br wire can be used to let the thermostat control the fan speed, or the furnace itself can be programmed to ramp up the fan speed. He is experienced in wood and metal construction, having designed and built several houses and metal buildings. I got the sv96 100k btu 2stage furnace with variable fan and the xl18 4ton ac unit. A MERV 16 filters particles at a level near that or a HEPA. Variable Speed Blower Motor (Genteq ECM 3.0, 4 pin connector). (Without enclosing my house in a climate-controlled bubble). Your R value shouldn't change, and daily average wind speed and precipitation should have a minimal effect on the convection coefficient. The constant torque/multispeed motor will have the smallest module. Here are how my dip switches are set: Did the installer tie in a humidistat there on that V/S blower . Most homes have a standard split-system air conditioning unit with two main fans. Especially with a high efficiency furnace, however, it may be that the decreased electric bill saves enough to offset the "loss up the flue" not sure. This will help prevent injury and. Usually there will be three "speeds" ranging from 40 to 100% of airflow. How to Lower the Ouptut of Oversized Furnace. Choose the Trane owner guide thats specific to your unit for detailed instructions on locating and changing yourairfilter. The only alternative is to raise the discharge temperature. She has experience researching and creating a wide range of home improvement and garden projects, and especially enjoys learning about fireplaces and exterior design. Click System Options. Your AC or furnace is designed for a specific type of filter. He is also an HVACR Contracting Business owner of 16 years and holds an NJ HVACR Master License. Your new AC unit is not collecting water (yet) because the anticondensation coating hasn't been compromised (yet); and that's a good thing. homininet 8 mo. Switch the power back on and test it. What actually happened was that it caused the furnace to short cycle, running for about 4.5 minutes then shutting off and immediately turning on again over and over until it reached the set point. Bundle Packs are a great way to save and get faster shipping! Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Here's hoping for some good answers. Most furnaces have a relay switch on the door cover. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Most require that you open a box (2 screws?) 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. 80% would be great for me. The S8X1 blower has 9 speeds. The ohm meter should read very close to zero. I want to do what is best. BarnArtist, locate the wiring schematic on your furnace. You may freely link to this site, and use it for non-commercial use subject to our terms of use. You can verify the actual CFM by measuring the TESP of the system and comparing it to the manufacturer's airflow data sheet. To understand how this works, lets look at the wiring on your furnaces blower. H.R. On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. Here are common Trane AC repairs not listed in the guide and their repair cost for parts and labor: Leaking coil and refrigerant: $1,150-$1,750 Thermostatic expansion valve (TXV): $275-$450 Compressor and refrigerant (after ten years, typically): $1,150-$1,600 Failed solder connection on refrigerant lines and refrigerant: $875-$1,220 Make sure power is off when doing any adjustment. Bus Driver/Substitute Teacher Presently the settings for the cooling mode is speed 7 (C1.7), heating mode at speed 5 (H1.5), and continuous fan mode is set at the lowest speed (CF.1). I can unsubscribe and opt-out from future communications at any time.
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