That said the contractor has no real incentive to get it right. 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. See our Privacy Policy for more information. If the pressure switch is functioning properly . 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. To understand how this works, lets look at the wiring on your furnaces blower. 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. The arrow should face the direction the air is flowing. Measured the temperature of the air before the coil and after the coil and used DeltaT (change in temperature) to determine the blower setting. The gas is shut off and the induction motor stops running while the blower . That is incorrect. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. Its not advisable to slow your furnace blower speed. It wasn't the noise that was bothering me, it was the desert-like sensation of swirling dry air. The wires that are used will determine the speed settings that the motor will run at. The heat exchanger warms up the incoming air and a blower or air handler sends the warm air throughout the home. Oil Furnaces may have a temp rise of 50-60F. 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. I understand the reason for slowing the air to remove humidity. If power is getting to the blower motor, but the motor does not run, the motor may be burned out. Fortunately, theres a simple fix if you look at your furnaces Integrated Furnace Control (IFC) board. It only takes a minute to sign up. There are several tutorials on Youtube about how to do this step for specific inducer motor brands. Air Filter - Be sure to check the air filter and replace if necessary. 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. The ohm meter should read very close to zero. 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). Then switch the jumper to your desired speed. However, I like the continually run the fan to even out air temperature in 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. How exactly could I test this? Move the high-speed wire to low. So the blower motor is dead. In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. Questions of a Do It Yourself nature should be submitted to our "DoItYourself.com Community Forums". By clicking '. ECM blower motors do not require an external capacitor to operate. Disconnect between goals and daily tasksIs it me, or the industry? He has been DIY since childhood and is now a septuagenarian. Note: (High voltage is always going to your blower motor along with the common for the 24 volts. In the example above, an ECM 2.3 16 pin variable speed motor is connected to an air handler control board. This will allow you to access the control board. By pressing "submit", I understand that I am providing express consent for Trane Residential to contact me about this request or similar topics. 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/. It offers three settings: 525 RPM for saving energy, 900 RPM for heating, or 1100 RPM for air conditioning. He built every permanent building on his current homestead and did all the plumbing and electrical work. We welcome your comments and Roughly 400 CFM is needed for every 1 ton (12,000 BTU/HR) of Heat Removal Capacity in Air Conditioning Systems. Air Conditioner + Furnace Matched Systems, Air Conditioner + Air Handler Matched Systems, Does Your Air Conditioner Smell? 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) *NOTE* If you attempt this, be absolutely sure that you have no power going to your system, especially before changing wires. Copyright 1995-document.write(new Date().getFullYear()) MH Sub I, LLC dba Internet Brands. 1 to 1.5 hours | Install the new motor, adjust it (multispeed and variable speed blowers only), run and test the furnace Installing a blower wheel with the motor shouldn't affect installation time, since the old wheel typically has to be removed to replace the motor. ago. 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. If the blower motor hums, check the blower fan to ensure that it spins freely. (new Image()).src = 'https://capi.connatix.com/tr/si?token=2ba02a33-c319-4410-bba7-f8321a13bed3&cid=877050e7-52c9-4c33-a20b-d8301a08f96d'; cnxps.cmd.push(function () { cnxps({ playerId: "2ba02a33-c319-4410-bba7-f8321a13bed3" }).render("00499ba9282e4d1b985fa8af14d29c2b"); }); On my furnace IFC, the black (high speed) wire is connected to the air conditioning (cool) terminal, and yellow (medium-high speed) is connected to the (heat) terminal. Thus, my blower can't be using that much electricity on high. Tools that we use: www.amazon.com/shop/acservicetech. So How Do We Adjust Fan Speed? The ignitor glows. One of these wires will be coming from the thermostat and the other will go to the outside unit. Using a hammer, lightly tap out the blower motor shaft (fig.6.7) to loosen the blower motor from the fan shroud (fig.6.8). Turn off the power source that is connected to the furnace blower. 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. Locate the speed wires. I miscalculated. Remove both of these wires and wire nut them together. I'm not in enhanced mode. 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. Has anyone done this and can anyone give me a reason why I shouldn't do this? Questions of a Do It Yourself nature should be The product data guide, and label on the inside panel indicate the air . He currently has a home shop where he sharpens and rebuilds saws, repairs lawn mowers, mobility scooters, hydraulic jacks, and anything else that comes along. Remove both of these wires and wire nut them together. Switched it to heat (in which case the furnace board is in control of the fan, not the stat) - got fire, no fan. The higher the MERV rating, the better the filter is at capturing specific pollutants from the air. Helm is an accomplished DIY craftsman. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. I connected a second thermostat to the circuit board to run the blower (R to G). Tied from R to BK in air handler. It can happen for lots of reasons, from improper furnace sizing and dirty filters to air duct insulation failures to the room being farthest from the furnace. If there isnt one in your home, turn it off at the breaker box. But I guess my question is, can the air flow problem really be a simple as upping the blower speed? During "Fan On", the fan runs at 50% of whatever the maximum speed of the fan is. On most control boards there will be a jumper that is marked to show that it controls the speed. It was working a week ago but just recently when it runs it blows out cold air. 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. problems contact webmaster@doityourself.com. submitted to our "DoItYourself.com Community Forums". This helps the XR80 conserve more of the heat it produces. To begin, turn off the power to your furnace. @Dave: Those were my thoughts as well. lower efficiency furnace) it is drafting exhaust up the flue which can't be good. Making statements based on opinion; back them up with references or personal experience. The continuous fan is marked SW3. He maintains fruit and nut trees along with helping his wife with a vegetable garden. Additionally, they can be identified by the presence of a removable module/bell on the end of the motor. How to Lower the Ouptut of Oversized Furnace. Remove the air handler. This can be done through an independent dehumidistat or through a thermostat's DEHUM terminal (if available). The blower motor also begins running, but at low rpm. Here's what to record, in order of importance: The last two (5 and 6) aren't as important, but more data is always better. The automatic feature rarely kicks in once at set point. The manual document include instructions and informations on how to troubleshoot the system. This will help prevent injury and damage to the furnace fan. A slim, removable cover will reveal the filter location. What sort of strategies would a medieval military use against a fantasy giant? 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. Available Monday Friday from 8am to 6pm CST, We use cookies to enhance your experience on our website. I am currently heavily invested in studying and learning the subject as I commit myself to reducing my winter energy costs this year. All rights reserved. When you open the panel, it kills the power to the furnace. Can a furnace with a variable speed blower be used in a multistory house? - Answered by a verified HVAC Technician . Air filters are measured by Minimum Efficiency Reporting Values (MERV). This value is then multiplied by 150 cfm to obtain the required airflow for the furnace in heating operation. Dealers can answer questions, help you find the right products for your home, and repair your system. I can unsubscribe and opt-out from future communications at any time. If you know what you are doing, it is very simple to adjust the speed of your furnace fan. low would be 350 CFMs/ton, medium 400 CFMs/ton, high 450 CFMs/ton. View our Privacy Policy here. 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. However, they are limited based on the total external static pressure (TESP) in the duct. 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. It provides quieter and more even and comfortable heat than a conventional furnace and doesnt consume electricity unnecessarily. Remove two screws from each bracket leg holding the motor. Design Engineer/Project Manager for injection molded plastic company 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. Are there downsides to this. Thanks for all your continued support! Reddit and its partners use cookies and similar technologies to provide you with a better experience. Switch the Jumper On most control boards there will be a jumper that is marked to show that it controls the speed. There is no humidistat. Thanks for contributing an answer to Home Improvement Stack Exchange! DoItYourself.com, founded in 1995, is the leading independent Is it suspicious or odd to stand by the gate of a GA airport watching the planes? You may freely link How to Convert a Furnace Blower Fan Into a Stand Alone Fan, What to Do When a Furnace Blower Fan Won't Start, How to Replace the Resistor on Air Conditioner Blower Fans. This furnace features the common White-Rodgers Intell-Ignition circuit board. A 90 percent-plus furnace needs 150 cfm per 10,000 Btu of input. There are often five wire colors coming from your blower to your IFC. These blower motor versions can be found in furnaces, air handlers, and packaged units. Adjusting the Airflow Speed on ECM Blower Fan Motors! Cookie Notice Step 2: Create a Safe Workspace When working with any unit connected to electricity, it's important to turn off the power to prevent electrocution and damage to your furnace. Cross country truck driver -- over dimensional freight All information is provided "AS IS." Privacy Policy. No need for direct trane replacment motor. The low pitched whine stops when fan is in high speed. On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. Thoroughly rinse the filter. Trane XR80 Troubleshooting After examining the flashing system you should check the green light speed. HVAC system for small church has twin Trane XR90 units installed in 2009 to replace a unit with a much larger single blower. It had been set on the higher speed, but that was too harsh, so I lowered it to the slower speed. (Heat transfer wasn't one of my favorite classes in college - I focused more on dynamic systems, sorry.). They do this by coupling a sophisticated, programmable thermostat to a variable-speed motor. To understand how this works, let's look at the wiring on your furnace's blower. 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. 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. Proper returns are rarely a thought. (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.) I know I need to replace a dying blower motor in a 1992 Trane XL80 gas furnace. The airflow adjustments on this board are pictured below. How to change blower speed on furnace - Trane XB 2018 Ryan W 794 subscribers Subscribe 185 44K views 4 years ago A quick description on how to change the blower speed on your furnace. We welcome your comments and suggestions. Most homes have a standard split-system air conditioning unit with two main fans. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Anyone? This is a follow-up to our other article on "Adjusting the Furnace/AC Airflow Speed on a 120v PSC Blower Motor". Also related, with for instance a variable speed furnace, since it runs continuously and reduces "cold spots" you might find you can set it at a lower degree setting than the off/on kind. This BTU/HR capacity should be used to set the CFM for the indoor blower motor. Example: Rated Btu Input = 60,000 / 10,000 = 6 x 150 = 900 cfm of required furnace airflow. This X-13 model shown above designates the speeds taps as numbers, not as colors, to denote each speed. Check out our free Quizzes to test your knowledge here! This lower blower speed enhances Another common place with a schematic is on the back of the blower fan door. I have another question about my new Trane XV95 Furnace. I'm in the process of re-wiring my blower to run on high with the furnace. 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. Access the control board. If a clear distinction between the blower speeds isn't obvious in the data, then you're probably not going to save much money either way, so go with what's most comfortable for you. My gas furnace has two options for the blower speed: MED, and MED-HI. 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. Why is my furnace blower running at low speed? Your AC or furnace is designed for a specific type of filter. Recently I did a blower speed adjustment on the 2nd floor air. Variable Speed Blower Motor (Genteq ECM 3.0, 4 pin connector). To clean a reusable filter, remove the filter from the air cleaning device. It accounts for the amount of air in circulation for precision airflow. Shay Tilander is a senior editor at Family Handyman. Most furnaces have a relay switch on the door cover. A 1.5 ton AC unit may not be large enough to cool the . If the terminals are present at the motor module (ECM X-13) you can switch speeds at the blower motor location. Bus Driver/Substitute Teacher Yes: you will save electricity costs by running your blower on low. I.e., maybe more heat is now escaping through the exhaust. A continuous green light means the IFC circuit board needs replacing. 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). Run a jumper from "R" to "Y2" and the blower will run continuously at the second-stage cooling speed. 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. 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. Yes, there is a way to bring up the speed on the air handler.. In order for the filter to work properly, the right size is crucial. According to the manufacturer's documentation, your furnace should have a 3 or 4 speed blower motor. I think that when it is in enhanced mode the fan only runs at 50%, you can try changing your dip switches to see. You will also see the red E icon under Emergency . There are only a few steps required for most units and having the control will allow you to get your unit to give you the service you need. 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 . 10 Reasons a Blower Fan Won't Start in a Furnace, AC or Heat Pump. Identify those arcade games from a 1983 Brazilian music video. For example, on a package unit, only taps 3, 4 and 5 may be programmed. Use tab to navigate through the menu items. You should now see a red E icon in the System Mode screen next to Auto and Heating modes. This is NOT a user servicable item. H.R. 3 of the wires will likely terminate with just a twist on cap. - The "Continuous Fan" refers to when the G terminal is powered for the fan only to run. 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). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Website operating problems contact Webmaster. View our Privacy Policy here. Once you have located the panel, remove it. For business related inquires email us at info@acservicetech.com. A second filter location for most HVAC systems and furnaces is the air handler portion of the system. American Standard air handler troubleshooting The arrow should face the direction the air is flowing. Can this be adjusted Your R value shouldn't change, and daily average wind speed and precipitation should have a minimal effect on the convection coefficient. Switch the power back on and test it. #3. Air Filters remove dust, lint, pet dander, and other pollutants so you can breathe easier knowing your indoor air quality is better with Trane. Learn more about Stack Overflow the company, and our products. This will show what speed each numbered tap is programmed as. 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). Sign up for our email newsletter to learn helpful HVAC tips and tricks before your purchase your system. Blower on delay settings, which evidently have an impact on the duration and speed of the blower fan. The constant torque/multispeed motor will have the smallest module. bean. Western VA. Nov 28, 2009. The MERV rating is typically printed on the filter packaging, but not necessarily on the filter itself. Top 10 Spots! The gas kicks on and is lit by the ignitor. Mine. The variable speed furnace delivers the proper amount of airflow based on the heating and cooling needs of your home. The control board has relays that regulate the voltage to each component in the furnace. Here's the sequence: Furnace gets call for heat. Since hot air is much lighter . He also builds custom tools for metal working. Check out www.acservicetech.com/store. I have a Trane XV90 propane furnace with a variable speed blower. The heat exchanger can be overheated and burned out if the blower does not remove enough heat. I want to do what is best. We have a Trane XL80 furnace manual in pdf version that you can download for free.