Access the control board. The furnace operates for two minutes or so before it shuts down. 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. Therefore I again adjusted the speed upward a bit and that seemingly has corrected the problem. - The "Continuous Fan" refers to when the G terminal is powered for the fan only to run. Cut the wire's terminal connector off with wire cutters. 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. BarnArtist, locate the wiring schematic on your furnace. These blower motor versions can be found in furnaces, air handlers, and packaged units. This will cause the "Cool" terminal on the control board to be connected to to the #4 terminal on the motor module via the black wire. The automatic feature rarely kicks in once at set point. The gas is shut off and the induction motor stops running while the blower . and as I recall, you have the HW VP IAQ stat. Adjusting the Airflow Speed on ECM Blower Fan Motors! 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. Turn off power at the main electric panel. 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). He is experienced in wood and metal construction, having designed and built several houses and metal buildings. Air filters are measured by Minimum Efficiency Reporting Values (MERV). It wasn't the noise that was bothering me, it was the desert-like sensation of swirling dry air. 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. 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. Website operating problems contact Webmaster. (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. The system also accounts for blocked vents and dirty furnace filters, and adjusts fan speed as needed to compensate. ECM Multi-Speed Blower Motor (Genteq X-13). A properly fitted filter can also trap unwanted, and oftentimes unseen, pollutants from the air in your home, including: Start with the return vent. I have a Trane XV90 propane furnace with a variable speed blower. 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? in this thread in this sub-forum in the entire site. . To understand how this works, lets look at the wiring on your furnaces blower. Tied from R to BK in air handler. AC Service Tech HVAC Training is made possible by continued support from our visitors, customers, and support from these Sponsors! Step 4: Take out the inducer motor. These are not switched off but are live all the time. I know I need to replace a dying blower motor in a 1992 Trane XL80 gas furnace. When the humidity is high for what its set at. Copyright 1995-document.write(new Date().getFullYear()) MH Sub I, LLC dba Internet Brands. If 1600 CFM is too high of an airflow volume and only 1200 CFM is needed because the system is a 36,000 BTU/HR air conditioner, we can swap the yellow with the black wire on the motor module. Why is my furnace blower running at low speed? 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. He also builds custom tools for metal working. Anyone? The video will also explain other safety measures, as well as some for a demonstration which I will show. According to the company, the slower circulation speed reduces energy consumption by 75%. On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. I simply am unable to put my hands on the schematic. He farmed commercial garden produce for several years. 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. For business related inquires email us at info@acservicetech.com. Switch the power back on and test it. I could imagine possibly fewer "warm up cycles" (which also include having to power on the fan) might save something (as well as lower fan speed=less electricity)but as others have noted, while its running (esp. 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. On the motor, only one of the 5 numbered taps has 24v power at a time based on the speed desired at the control board. If the blower motor hums, check the blower fan to ensure that it spins freely. 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. You can change the settings for cfm fan speed, but you have to do it manually at the board. Black: High; Yellow: Medium-high ; Blue or brown: Medium-low; Red: Low; You will need to find the main cover panel on your fan. When you open the panel, it kills the power to the furnace. The installation guide clearly describes how to set airflow for heating mode and cooling mode. Before you begin this process it is a good idea to make sure that no power is going to the fan. Variable speed furnaces only operate at . Bundle Packs are a great way to save and get faster shipping! If the Delta T continues to rise, this is due to low indoor airflow. My question was whether the efficiency of heat transfer thru the exchanger would be somewhat compromised due to the reduced airflow. I have another question about my new Trane XV95 Furnace. Connect the ohm meter to the pressure switch. Know your limits. The company offers a variety of furnaces to suits the needs of every home. with a wiring harness for the fan. Options are, for example, 4 minutes at 80%, or 30 seconds at 50%. I got the sv96 100k btu 2stage furnace with variable fan and the xl18 4ton ac unit. I want it for the same reason as cliff--the top floor of my house is colder than the main floor and I'd like to even things out by moving more air around. ECM Multi-Speed Blower Motor (Broad Ocean Type), For an ECM blower motor with wires exiting the module (shown above), the speed is changed at the control board by moving the colored wire terminals. I know I need to replace a dying blower motor in a 1992 Trane . It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? The heat exchanger can be overheated and burned out if the blower does not remove enough heat. I think I had it on my hard drive, and the hard drive crashed on us last winter. The MERV rating is typically printed on the filter packaging, but not necessarily on the filter itself. The airflow adjustments on this board are pictured below. H.R. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Craig is a licensed Teacher of HVACR, Sheet Metal, and Building Maintenance in the State of New Jersey of the USA. Each is associated with a different blower speed. Proper duct sizing can resolve the issue you are having. 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. Design Engineer/Project Manager for injection molded plastic company Iappreciate all the comments, questions, and responses that Ireceive from each of you. I'd like to get some second opinions. 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. STEP-BY-STEP REPLACEMENT GUIDE Turn off air conditioning / heat from the thermostat. I'm also going to go through and make sure there are no visible leaks or damage to them. This covers speed adjustment on a PSC motor. The induction motor begins running. Most homes have a standard split-system air conditioning unit with two main fans. To understand how this works, let's look at the wiring on your furnace's blower. to this site, and use it for non-commercial use subject to our terms of use. Example: 1200 CFM is needed for a 3 ton 36,000 BTU/HR system. 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. Soak the filter in warm water in a bathtub or sink. He is committed to outdoor cooking in a Bar-B-Q pit he welded together several years ago. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You need to follow the wiring diagram inside the HVAC unit. Then, carefully switch it to the setting of your choice and push it back into the control board. #3. Solution: Install a new sequencer AND a new fan relay, just to be safe. 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 following list refers to each adjustment starting from the bottom and moving upward. 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. Air filters are typically found behind the return vent door, often located in the ceiling or wall in the central portion of your home. Remove both of these wires and wire nut them together. The remaining colored wires will be default speeds. 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. Secure the old speed wire by twisting a wire nut over the end. But I guess my question is, can the air flow problem really be a simple as upping the blower speed? homininet 8 mo. Air Filter - Be sure to check the air filter and replace if necessary. Air filters should be changed every 90 days unless otherwise indicated on the packaging or by the manufacturer. Western VA. Nov 28, 2009. This trick only works on gas furnace systems with a multi-speed blower. Helm is an accomplished DIY craftsman. CFM stands for "cubic feet per minute." Can a furnace with a variable speed blower be used in a multistory house? 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. Thanks for all your continued support! They do this by coupling a sophisticated, programmable thermostat to a variable-speed motor. If the furnace manufacturer supplies different burners for that unit you may be risking premature failure. 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. Heat exchange takes time. We welcome your comments and It is about 1300-1400 sq feet, but then the basement was finished at some point, more or less doubling the square footage. You can verify the actual CFM by measuring the TESP of the system and comparing it to the manufacturer's airflow data sheet. 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. 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 hot air will rise and heat the floor from beneath, a DIY form of radiant floor heating. Make sure power is off when doing any adjustment. He has several years experience as a professional cabinet builder, and he is an accomplished auto repairman, having operated an auto repair business for many years. I miscalculated. Adjust the fan speed, and if you're still experiencing problems, contact your local American Standard Customer Care dealer. Now that its gotten cold, we've noticed that several of the heat register barely have any air coming out of them. I.e., maybe more heat is now escaping through the exhaust. A dirty air filter can cause your HVAC system to go into overdrive and result in costly energy bills. 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. There are several tutorials on Youtube about how to do this step for specific inducer motor brands. Check out www.acservicetech.com/store. 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). Since hot air is much lighter . I guess you are talking about a 3 speed direct drive motor with 1/2 shaft. Can airtags be tracked from an iMac desktop, with no iPhone? DoItYourself.com, founded in 1995, is the leading independent This control board is out of a variable speed furnace with a modulating gas valve that has a variable speed inducer motor. It is important to know that you cant go by a normal color code to determine the speeds. I think that when it is in enhanced mode the fan only runs at 50%, you can try changing your dip switches to see. Employment/Education Highlights Locate the speed wires. 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 house cools off quick - too quick - and feels humid (not sure of the rh%). If you really wanted to be scientific, you could perform an experiment and post the results here. Mutually exclusive execution using std::atomic? That is incorrect. 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. I know that it has been done. . video below! Then switch the jumper to your desired speed. rev2023.3.3.43278. You need to find the wires that determine blower speed inside your furnace. Trane. Thus, my blower can't be using that much electricity on high. Running your furnace fan all the time isn't exactly a bad thing. So if you are actually moving 1250 CFM then you are at 357 CFM/ton, which is a good setup for dehumidifying. The arrow should face the direction the air is flowing. On this motor module, the speed wires are red, orange, blue, yellow, and black. Copyright Step 3: Find the furnace draft inducer. During the awake hours I Hold the fan speed at either low or medium. Another common place with a schematic is on the back of the blower fan door. Trane s9v2 should thermostat control blower speed? Use tab to navigate through the menu items. 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. 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 . On most control boards there will be a jumper that is marked to show that it controls the speed. I just had a Trane system installed last week and I've been very happy with it! 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. Are there downsides to this. home improvement and repair website. Remember that CFM stands for Cubic Feet Per Minute. All information is provided "AS IS." 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. 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. I'll edit my answer and include the exact parameters I'd record every day for a thorough study. 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. Be sure to check out our previous article on "Adjusting the Furnace/AC Airflow Speed on a 120v PSC Blower Motor" if you haven't read it yet!