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. Cockroaches and waterbugs coming in through the vents was my big clue there. How does a furnace work? 4TEE3C10A1 That is excessivly loud. They do this by coupling a sophisticated, programmable thermostat to a variable-speed motor. If the blower motor hums, check the blower fan to ensure that it spins freely. There are also red and brown furnace speed wires. The problem is, the furnace control module doesn't use a separate speed when the unit is running in continuous FAN mode. Luci is a contributing writer for DoItYourself.com. You will also see the red E icon under Emergency . But the 'real' one will be the one connected with a twist on cap to the fan motor. Oil Furnaces may have a temp rise of 50-60F. The blower motor also begins running, but at low rpm. A dirty air filter can cause your HVAC system to go into overdrive and result in costly energy bills. Compatible with Trane systems or any standard HVAC system. To begin, turn off the power to your furnace. 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. 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. Check back regularly as we are always updating and improving thiswebsite! There is another way to wire this, but I can not find it back.. I was reading the Trane XL824 thermostat installation and setup manual. 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. Step 3: Adjust the Pulley on the Blower Drive Motor HVAC system for small church has twin Trane XR90 units installed in 2009 to replace a unit with a much larger single blower. That is incorrect. (FYI Filter was clean and furnace was recently serviced all prior to my initial investigation of the short cycling). 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). But, in looking up the manual for this furnace (TUD1B100A9361), it looks like there are 4 blower speeds. Trane s9v2 should thermostat control blower speed? For business related inquires email us at. This will allow you to access the control board. Example: Rated Btu Input = 60,000 / 10,000 = 6 x 150 = 900 cfm of required furnace airflow. This furnace features the common White-Rodgers Intell-Ignition circuit board. On most control boards there will be a jumper that is marked to show that it controls the speed. Yes, there is a way to bring up the speed on the air handler.. When the system calls for heat and the inducer fan begins to run, check each pressure switch terminal. problems contact webmaster@doityourself.com. 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. Black: High; Yellow: Medium-high ; Blue or brown: Medium-low; Red: Low; It helps to have over 50 years of farming and ranching experience. Note also that there is always just "one blower" but that blower may or may not be variable speed, etc. I think the best bet would be to actually test it for a few months and see. The arrow should point toward the unit. This video is to show how you can figure out the blower speed setup in your HVAC system, and what you can do do adjust said speeds. Does that have any impact on the efficiency of the unit? He owned and operated a manufacturing business building Compact Utility Vehicles for homeowner use. 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. 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. If the blower motor is burned out, replace it. On the furnace / air handler board you should have two wires on the "Y2" connection, assuming a two-stage cooling system. The ignitor glows. I'd like to get some second opinions. It provides quieter and more even and comfortable heat than a conventional furnace and doesnt consume electricity unnecessarily. First, make sure that power is getting to the motor. Most of these are on the bottom left of the control board. This value is then multiplied by 150 cfm to obtain the required airflow for the furnace in heating operation. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. See our Privacy Policy for more information. Employment/Education Highlights 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. It accounts for the amount of air in circulation for precision airflow. I know I need to replace a dying blower motor in a 1992 Trane XL80 gas furnace. -The "AUX Heat" makes sure that there is enough airflow when elect strip heat is called. If the ohm meter comes back with an open line reading, the switch is bad and needs replaced. 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. 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. Does lowering the blower speed of a forced-air furnace lower its efficiency? The control board is communicating with the blower module in order to determine the airflow volume needed. How do I check if this furnace switch the blower to second speed. You will need to find the main cover panel on your fan. Test your knowledge with our 1,000 question workbook along with the answer key! How exactly could I test this? When he's not enjoying family time with his wife and three boys, he loves tinkering with projects and geeking out on electronics. The manual document include instructions and informations on how to troubleshoot the system. one room doesnt get as warm or as cool as the others. Reddit and its partners use cookies and similar technologies to provide you with a better experience. 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. 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. ASE Certified Master Auto Technician I have another question about my new Trane XV95 Furnace. Know your limits. 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. Remove both of these wires and wire nut them together. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The induction motor begins running. Please note that mounting bracket consists of top and bottom brackets joined by 6 metal screws (fig.6.9). During "Fan On", the fan runs at 50% of whatever the maximum speed of the fan is. Questions of a Do It Yourself nature should be submitted to our "DoItYourself.com Community Forums". 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. I am just clueless, could it be the thermostat (really old) or something that is going to cost a billion dollars to fix? There are often five wire colors coming from your blower to your IFC. We welcome your comments and suggestions. Proper duct sizing can resolve the issue you are having. Since I first posted this thread, my installer called Trane to get an answer to my original question. When changing the AC or furnace filter, the arrow should face the furnace and point away from the return duct. 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. He farmed commercial garden produce for several years. Here's hoping for some good answers. 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. Home House & Components Systems Heating & Cooling System Air Conditioners. 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. When one of the taps is powered with 24v, the motor will turn on and run at the selected speed. Test the new speed. 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. We welcome your comments and The higher the MERV rating, the better the filter is at capturing specific pollutants from the air. Access the control board. 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. Only swap these two wires. H.R. You may freely link To understand how this works, let's look at the wiring on your furnace's blower. Use dish soap and a soft-bristle brush or sponge to remove stuck-on debris. Air Filters remove dust, lint, pet dander, and other pollutants so you can breathe easier knowing your indoor air quality is better with Trane. Western VA. Nov 28, 2009. The boiler is feeding a DHW sidearm and furnace plenum HX. The blower energy draw at a lower speed will be offset by the loss in fan wheel inertia. Typically the colors are: White = neutral speed Red = low speed Yellow = medium speed Black = high speed The automatic feature rarely kicks in once at set point.