A 90 percent-plus furnace needs 150 cfm per 10,000 Btu of input. 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. You will need to find the main cover panel on your fan. and as I recall, you have the HW VP IAQ stat. 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. Identify the blower fan and the speed wires. Top 10 Spots! Test the new speed. They do this by coupling a sophisticated, programmable thermostat to a variable-speed motor. Remove both of these wires and wire nut them together. 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. 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. I have a Carrier furnace/heat pump with an expensive control thermostat that talks directly to the heat pump. Helm is an accomplished DIY craftsman. Cut the wire's terminal connector off with wire cutters. How does a furnace work? Comfort R should be off if you are using . 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. I can unsubscribe and opt-out from future communications at any time. H.R. Press Apply to save and exit. 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. There are often five wire colors coming from your blower to your IFC. 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. Blower on delay settings, which evidently have an impact on the duration and speed of the blower fan. Match the positions to the desired pictures within the manufacturer's installation literature. In the manual, it lists some settings, e.g. According to the company, the slower circulation speed reduces energy consumption by 75%. The wire's color will determine the speed settings that the motor will run at. Most require that you open a box (2 screws?) This covers speed adjustment on a PSC motor. It would have no affect on the Heat settings. Additionally, they can be identified by the presence of a removable module/bell on the end of the motor. 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. Choose the Trane owner guide thats specific to your unit for detailed instructions on locating and changing yourairfilter. At night with an . Allow the filter to completely dry before returning it to the device. HVAC filters help remove dust, dander, and harmful particles from the air inside your home. And I'd guess you're not supposed to push it too close to the limits as things may change slightly over time (filter will get dirtier, blades dirtier). Asking for help, clarification, or responding to other answers. The wires are several different colors. Remove the air handler. 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. 01 - Trane Furnace Control Board. This helps the XR80 conserve more of the heat it produces. One fan is inside the house, and one is outside the home. Step 3: Find the furnace draft inducer. Ilook forward to responding to many more! The real fix is to add insulation and install a second system on the second floor of most recently constructed homes with an adequate number of true ducted returns as opposed to the leaking stud-space returns contractors are so fond of. charts are usually found on the air handler inside door to controls. . The manual document include instructions and informations on how to troubleshoot the system. (FYI Filter was clean and furnace was recently serviced all prior to my initial investigation of the short cycling). The constant air turn over at a lower set point keeps the house comfortable. These adjustments can be made by pulling the single wire connector and moving it to another single tab positioned horizontally in each row. All information is provided "AS IS." 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. Electric Furnace Sequencer Replacement Instructions for Home Repair Blower fan will not run: A failing sequencer may have a burnt contact and is unable to switch the fan and heating coils ON. Yes, there is a way to bring up the speed on the air handler.. The NET difference of the above two figures is your savings or cost. *NOTE* If you attempt this, be absolutely sure that you have no power going to your system, especially before changing wires. Be sure to check out our previous article on ", If you want to learn about refrigerants and how they work in a system, check out our. Can I retrofit a 2-speed or variable speed blower on a Payne PG8UAA forced air furnace? Trane s9v2 should thermostat control blower speed? The same is true when changing the air duct filter. My first thought was that the unit was oversized, but I figured out how to check the DIP switch settings. If your home has multiple HVAC systems, there will likely be at least one air filter for each unit. Now that its gotten cold, we've noticed that several of the heat register barely have any air coming out of them. Step 2: Remove the panel cover of the furnace. Has anyone done this and can anyone give me a reason why I shouldn't do this? He is experienced in wood and metal construction, having designed and built several houses and metal buildings. This furnace features the common White-Rodgers Intell-Ignition circuit board. When he's not enjoying family time with his wife and three boys, he loves tinkering with projects and geeking out on electronics. Our Privacy Policy governs the use of your information. In humid climates, 350 CFM per ton can be selected in order to remove more moisture from the air. Shay Tilander is a senior editor at Family Handyman. Thanks for contributing an answer to Home Improvement Stack Exchange! A 1.5 ton AC unit may not be large enough to cool the . enjoys making jams and jellies during fruit season along with cooking meals. It offers three settings: 525 RPM for saving energy, 900 RPM for heating, or 1100 RPM for air conditioning. http://www.inspectorsjournal.com/Forum/topic.asp?TOPIC_ID=8998&, We've added a "Necessary cookies only" option to the cookie consent popup. The most important factor is temperature differential - the difference between the inside temperature and outside temperature. Here are how my dip switches are set: Did the installer tie in a humidistat there on that V/S blower . How do I check if this furnace switch the blower to second speed. Air filters should be changed every 90 days unless otherwise indicated on the packaging or by the manufacturer. 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). It shouldn't take more than a few minutes a day to record the data anyway. These blower motor speeds are programmed at the manufacturer's factory for the specific equipment model number unit it is installed in. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Check out our free Quizzes to test your knowledge here! Usually there will be three speeds ranging from 40 to 100% of airflow. The remaining colored wires will be default speeds. The noise is there in heat or AC. We are no longer supporting IE (Internet Explorer). 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. A description of how to change motor speeds with a multiple speed fan motor on an IFC controlled furnace.This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. As a side note, lowering furnace (heating) blower speed should apparently only be done if it doesn't reduce the "heat rise" (difference in temperature between the intake and supply air, if I understand it, also known as the "delta T") past the manufacturer recommended value for that furnace. I connected a second thermostat to the circuit board to run the blower (R to G). If the furnace manufacturer supplies different burners for that unit you may be risking premature failure. Usually there will be three "speeds" ranging from 40 to 100% of airflow. What sort of strategies would a medieval military use against a fantasy giant? Craig is a licensed Teacher of HVACR, Sheet Metal, and Building Maintenance in the State of New Jersey of the USA. The blower energy draw at a lower speed will be offset by the loss in fan wheel inertia. We also have quick reference cards for use out in the field! @Dave: Those were my thoughts as well. To understand how this works, let's look at the wiring on your furnace's blower. A MERV 16 filters particles at a level near that or a HEPA. This is done so that the maximum amount of heat is gained in the building from the refrigerant. Unlike a conventional systemwhere the furnace goes on, blows hot air into the house at full force for a few minutes, and then shuts offa variable-speed or variable-capacity system runs the blower for longer periods at lower speeds. When the R-G circuit is made, the blower motor operates on heating speed. There is another way to wire this, but I can not find it back.. Since I first posted this thread, my installer called Trane to get an answer to my original question. Oil Furnaces may have a temp rise of 50-60F. Trane is a top rated US company of HVAC systems that offer quality and reliability. The higher the MERV rating, the better the filter is at capturing specific pollutants from the air. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. 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. When one of the taps is powered with 24v, the motor will turn on and run at the selected speed. 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. Recently I did a blower speed adjustment on the 2nd floor air. Mutually exclusive execution using std::atomic? Top Ten Interview Tips to Land that HVAC/R Job! Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Can you increase the speed of an ECM AC blower? Can a furnace with a variable speed blower be used in a multistory house? 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. This X-13 model shown above designates the speeds taps as numbers, not as colors, to denote each speed. If the ohm meter comes back with an open line reading, the switch is bad and needs replaced. Each is associated with a different blower speed. Website operating The MERV rating is typically printed on the filter packaging, but not necessarily on the filter itself. The SW2 indicates the air conditioning size. and our The continuous fan is marked SW3. He farmed commercial garden produce for several years. If the blower motor is burned out, replace it. 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. When you open the panel, it kills the power to the furnace. So I continued to play around with different combinations tonight. Compatible with Trane systems or any standard HVAC system. 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. A slim, removable cover will reveal the filter location. The control board has relays that regulate the voltage to each component in the furnace. They have a built in or attached capacitor that will allow the motor to turn on, turn off and run at a constant speed when running. Design Engineer/Project Manager for injection molded plastic company On this motor module, the speed wires are red, orange, blue, yellow, and black. -The "AUX Heat" makes sure that there is enough airflow when elect strip heat is called. - The "Continuous Fan" refers to when the G terminal is powered for the fan only to run. Narrowing that hysteresis loop will: Leading to a smaller Hysteresis loop, increasing motor efficiency by reducing iron eddy current losses. 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. This is a follow-up to our other article on "Adjusting the Furnace/AC Airflow Speed on a 120v PSC Blower Motor". Bus Driver/Substitute Teacher 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). 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. Turn off the emergency HVAC shutoff switch Remove top and bottom cover panels on the air handler / furnace unit (fig.5.1). A properly fitted filter can also trap unwanted, and oftentimes unseen, pollutants from the air in your home, including: Start with the return vent. Cockroaches and waterbugs coming in through the vents was my big clue there. You need to find the wires that determine blower speed inside your furnace. home improvement and repair website. It had been set on the higher speed, but that was too harsh, so I lowered it to the slower speed. This will help prevent injury and. Switch the Jumper On most control boards there will be a jumper that is marked to show that it controls the speed. The question is would the trade-off be in favor of less blower energy consumption and more loss through exhaust, or more blower energy consumption and less loss through exhaust. 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. So if you are actually moving 1250 CFM then you are at 357 CFM/ton, which is a good setup for dehumidifying. We welcome your comments and submitted to our "DoItYourself.com Community Forums". CFM stands for "cubic feet per minute." 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. Select your preferred wire with the warm temperature and connect it to the 'heat' port. Then switch the jumper to your desired speed. Solution: Install a new sequencer AND a new fan relay, just to be safe. XB Trane Furnace: Is there a fan speed control on the unit. Does lowering the blower speed of a forced-air furnace lower its efficiency? You should now see a red E icon in the System Mode screen next to Auto and Heating modes. 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. Also, if you are looking for a video to better help understand this topic, check out our "Adjusting HVAC Blower Speed CFM on Furnace & AC Units!" 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. - Answered by a verified HVAC Technician . This will show what speed each numbered tap is programmed as. Most furnaces have a relay switch on the door cover. Access the control board. There are often five wire colors coming from your blower to your IFC. Example: 1200 CFM is needed for a 3 ton 36,000 BTU/HR system. The line voltage and 24v common are connected at the top and are labeled as C, L, G, N. The 24v common is C and the ground wire is G. For a 120v unit, the L is the 120v hot and the N is the 120v neutral. He has been DIY since childhood and is now a septuagenarian. STEP-BY-STEP REPLACEMENT GUIDE Turn off air conditioning / heat from the thermostat. Continue reading to learn how to lower the fan speed. Remove both of these wires and wire nut them together. For example, on a package unit, only taps 3, 4 and 5 may be programmed. I'm not completely convinced on this, since the claim is made by a company that sells variable speed blowers for retrofitting HVAC systems. This control board is out of a variable speed furnace with a modulating gas valve that has a variable speed inducer motor. H.R. 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. I installed a Thermo Control 2000 boiler and first fired it up this Friday. Remove two screws from each bracket leg holding the motor. Many gas-fired, high-efficiency furnaces also save on the electricity required to power the blower motor, though this savings is not factored into the AFUE rating. 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'll edit my answer and include the exact parameters I'd record every day for a thorough study. Run a jumper from "R" to "Y2" and the blower will run continuously at the second-stage cooling speed. The arrow should face the direction the air is flowing. Its time to clear the air. Can this be adjusted When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. Making statements based on opinion; back them up with references or personal experience. American Standard air handler troubleshooting Air Filters remove dust, lint, pet dander, and other pollutants so you can breathe easier knowing your indoor air quality is better with Trane. I suppose I probably won't do so it, but out of curiosity what kind of downside might one run into? He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. 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. The boiler is feeding a DHW sidearm and furnace plenum HX. Remove battery from the thermostat (or disconnect thermostat altogether). Options are, for example, 4 minutes at 80%, or 30 seconds at 50%. Before you begin this process it is a good idea to make sure that no power is going to the fan. Again, this can usually be found in the upper-left corner. Step 4: Take out the inducer motor. The factory may only set two or three of these colors as actual speeds. The house has a 3 ton trane xl20i and an xv80 (4 ton max). Air filters are typically found behind the return vent door, often located in the ceiling or wall in the central portion of your home. I just moved into a house with a Trane XR80 furnace (several years old). I got the sv96 100k btu 2stage furnace with variable fan and the xl18 4ton ac unit. On my furnace the schematic showed there were three speed settings. You will also see the red E icon under Emergency . Certified Welder Of course all that heat was lost because of the ridiculous number of vents in our foundation. This will allow you to access the control board. Proper returns are rarely a thought. Therefore for anybody thinking to adjust their blower speed to a low setting be mindful and use caution and listen carefully as to how the system is running.