The following list refers to each adjustment starting from the bottom and moving upward. 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. Heres What It Means, Why You Should Monitor the Humidity Levels In Your Home. Make sure power is off when doing any adjustment. 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. you will get the better dehumidification with the lower setting. We have been heating the crawl space in our house for several winters because the ductwork was all torn up from rats. The blower/fan seems to be running way to fast. (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. 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. Press Apply to save and exit. Test your knowledge with our 1,000 question workbook along with the answer key! After a bit of research, (translated: "mad google skills") I found an article claiming that lowering the blower speed may increase efficiency. It allows three constant fan speeds as well as an automatic fan speed and a variable burn rate and compressor and fan speed. Turn off power at the main electric panel. Identify those arcade games from a 1983 Brazilian music video. 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. I found one glued to the back of my furnace door, one in the manual, and maybe one on-line too. The problem is, the furnace control module doesn't use a separate speed when the unit is running in continuous FAN mode. Another common place with a schematic is on the back of the blower fan door. The factory may only set two or three of these colors as actual speeds. Why is there a voltage on my HDMI and coaxial cables? So the blower motor is dead. If you have not read that yet, I would encourage you to do so! This is NOT a user servicable item. When the system calls for heat and the inducer fan begins to run, check each pressure switch terminal. home improvement and repair website. Click System Options. Since hot air is much lighter . We also have quick reference cards for use out in the field! 80% would be great for me. It is about 1300-1400 sq feet, but then the basement was finished at some point, more or less doubling the square footage. How to Fix a Pressure Switch Error on a Trane | Hunker Oil Furnaces may have a temp rise of 50-60F. In a gas furnace, (the most common type of furnace used in homes) natural gas is ignited in the burner and the flames heat up the heat exchanger. It wasn't the noise that was bothering me, it was the desert-like sensation of swirling dry air. Proper returns are rarely a thought. I suppose I probably won't do so it, but out of curiosity what kind of downside might one run into? We have a Trane XL80 furnace manual in pdf version that you can download for free. A dirty air filter can cause your HVAC system to go into overdrive and result in costly energy bills. In the example of an ECM 3.0 with a 4 pin connector, the wires are not switched or moved to adjust the airflow settings. Id check that out first. Understanding and How to Change Blower Speed on a Furnace Air - YouTube I just had a Trane system installed last week and I've been very happy with it! These blower motor speeds are programmed at the manufacturer's factory for the specific equipment model number unit it is installed in. You have to switch the wires to the blower motor. 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. I know that it has been done. In order for the filter to work properly, the right size is crucial. Adjusting the Airflow Speed on ECM Blower Fan Motors! (Variable & Multi Furnace Blower Motor Replacement Cost | HVAC System Repairs - Thumbtack A 90 percent-plus furnace needs 150 cfm per 10,000 Btu of input. This will show what speed each numbered tap is programmed as. You can change the settings for cfm fan speed, but you have to do it manually at the board. 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. No: you will not save on gas/oil costs by running your blower on low. 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. Changing your HVAC and furnace air filter is a vital part of home maintenance. Furnace Blower Motor Replacement Cost - Costimates Yes: you will save electricity costs by running your blower on low. 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. Employment/Education Highlights The ohm meter should read very close to zero. 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.. One of these wires will be coming from the thermostat and the other will go to the outside unit. Adjusting the Airflow Speed on ECM Blower Fan Motors! H.R. 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. The furnace operates for two minutes or so before it shuts down. 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. Proper duct sizing can resolve the issue you are having. On my furnace the schematic showed there were three speed settings. It accounts for the amount of air in circulation for precision airflow. Radiant floor heat web sites are mysteriously silent on this simple and cheap modification of pre-exisiting systems to accomplish the same goal. That is incorrect. To understand how this works, let's look at the wiring on your furnace's blower. I do know that my entire furnace runs safely on a 15amp breaker with the blower on high, the burner running, the humidifier running, and the water pump to empty the humidifier running. The MERV scale rates filters from 1 to 16. I'll edit my answer and include the exact parameters I'd record every day for a thorough study. According to the manufacturer's documentation, your furnace should have a 3 or 4 speed blower motor. He is experienced in wood and metal construction, having designed and built several houses and metal buildings. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? This lower blower speed enhances How do I check if this furnace switch the blower to second speed. 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. 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. Can you increase the speed of an ECM AC blower? The most important factor is temperature differential - the difference between the inside temperature and outside temperature. Connect with our Customer Care team about your products, warranties, and dealer concerns. You will also see the red E icon under Emergency . Secure the old speed wire by twisting a wire nut over the end. Stage 3 Aux Heating. There is another way to wire this, but I can not find it back.. However, they are limited based on the total external static pressure (TESP) in the duct. Your AC or furnace is designed for a specific type of filter. In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. and our The wires that are used will determine the speed settings that the motor will run at. 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!" 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. First, make sure that power is getting to the motor. Trane s9v2 should thermostat control blower speed? If the terminals are present at the motor module (ECM X-13) you can switch speeds at the blower motor location. Most of these are on the bottom left of the control board. Can I retrofit a 2-speed or variable speed blower on a Payne PG8UAA forced air furnace? 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. You can verify the actual CFM by measuring the TESP of the system and comparing it to the manufacturer's airflow data sheet. Variable Speed Blower Motor (Genteq ECM 3.0, 4 pin connector). My gas furnace has two options for the blower speed: MED, and MED-HI.