how to replace blower motor in furnace

1. What is a Blower Electric Motor in a Furnace?

(how to replace blower motor in furnace)

A blower electric motor is the heart of your heater’s air flow system. It sits inside the heating system cupboard and spins a fan wheel that pushes heated air through your ductwork and into every room of your house. This motor does not produce warm. It just moves the air throughout the warmth exchanger and out into your home. You can think about it as a powerful follower that turns your heating system from a basic metal box right into a whole-home convenience device. The electric motor itself is a cylindrical element, usually black or silver, with cords going to a control panel. Many modern furnaces utilize a digitally commutated motor, or ECM, which adjusts its rate based upon air movement demands. Older furnaces depend on a common long-term split capacitor electric motor. Both kinds at some point break. When you peer via the front panel of your furnace, the blower motor is the tool connected to the squirrel-cage follower. It is not the inducer motor that vents exhaust gases. That is a separate, smaller sized motor near the burners. The blower electric motor’s work begins the moment the warm exchanger heats up. The control panel sends a signal, the electric motor rotates up, and a stable stream of warm air rushes out of your registers. Without a functioning blower electric motor, your heater is just a quiet steel closet that can fire up but can not supply convenience. Keeping it in good shape indicates recognizing exactly how it works and knowing when it is time to action in and change it.

2. Why Replace a Blower Motor?

A failing blower motor tells you it is tired in numerous visible methods. You might listen to a loud humming, a shrieking noise, or a balanced thumping that worsens with time. The air movement from your vents may expand weak, so particular spaces become cool while others stay warm. Your power bills can climb up because a having a hard time motor draws more power to do the same work. In some cases the motor will get too hot, journey the breaker, or shut down completely, leaving you without any warm in all. Replacing the motor is cheaper than changing the entire heating system, which is a much bigger cost. You can check the normal cost to change a heater to see the difference. A new blower motor brings back complete air flow, silences the system, and lowers your regular monthly expenses. It additionally avoids the stress from damaging other components like the control panel or the heat exchanger. A blower electric motor that is not functioning right can trigger the heating system to overheat and cycle off too promptly, a condition called short biking. This puts extra endure the igniter and gas valve. Another reason to change is age. Many blower electric motors last between 15 and 20 years. If your heater is older and the motor has never been exchanged, you are residing on obtained time. A proactive replacement can save you from a twelve o’clock at night failing in the middle of a cold snap. Additionally, a clogged up or filthy filter compels the motor to work harder, causing very early failure. You can avoid this by understanding just how usually to transform furnace air filter and keeping it fresh. A tidy filter is the most basic protection against blower electric motor wear. Lastly, a brand-new electric motor can be a clever upgrade. An ECM motor runs quieter and utilizes much less electrical energy than an old PSC electric motor. The cash you minimize power usually spends for the motor itself within a few years.

3. Exactly how to Change a Blower Electric Motor in a Furnace?

Replacing a blower motor is a task you can do yourself with a few hours of mindful work. First, shut off the power to the heating system at the breaker panel and at the service activate the device. Never avoid this step. Next, locate the heater filter and eliminate it. If you are uncertain where it is, you can discover where is the heater filter before you start. The filter port is normally near the blower area. With the remove, situate the blower access panel. It is the lower door on a lot of furnaces. Get rid of the screws and glide the panel off. You will see the blower electric motor assembly sitting on a metal track or secured with screws. Disconnect the electrical wiring harness that plugs into the motor. Take an image with your phone before you disconnect anything. This photo will be your overview when you link the new motor. The entire blower assembly, that includes the electric motor, fan wheel, and housing, commonly glides out as one unit. There may be a number of screws holding the housing to the furnace framework. Eliminate them and gently move the assembly out. Now you need to divide the electric motor from the follower wheel. The follower wheel is affixed to the electric motor shaft with a set screw. Loosen the set screw with an Allen wrench or a hex chauffeur. After that pull the fan wheel off the shaft. You might require to shake it or utilize a puller device if it is stuck. Once the follower wheel is off, unlock the motor from the placing bracket. Take the old motor to a supply home to get an exact suit, or order one online making use of the model number. Install the brand-new motor by bolting it to the bracket. Glide the follower wheel onto the new electric motor shaft. Make certain the set screw is limited on the level component of the shaft. The follower wheel ought to rotate easily without massaging the real estate. Glide the entire setting up back right into the furnace and secure it. Reconnect the electrical wiring harness utilizing your photo as a recommendation. Double-check that all connections are snug. Put the access panel back, slide in a tidy filter, and bring back power. Turn the thermostat to warmth and pay attention for a smooth, quiet start-up. The brand-new electric motor should run without any squeaks or rattles. If the air flow is solid and steady, you have actually efficiently replaced the blower motor.

4. Applications of a Furnace Blower Motor

A heater blower electric motor does a lot more than simply press warmth around in winter months. It plays a central function in whole-home convenience all year long. In the summertime, the exact same electric motor drives the air across your air conditioning unit’s evaporator coil to send out awesome air through the ducts. So a healthy blower electric motor is important for both heating & cooling seasons. Several contemporary thermostats have a “fan only” establishing that allows you run the blower without heat or cool. This flow mode filterings system the air regularly and levels temperature levels in between areas. It transforms your blower electric motor into a whole-house air cleanser when coupled with an excellent filter. Some high-end systems utilize the blower motor to run a dehumidification cycle. The motor runs at a really reduced speed to draw dampness from the air without overcooling your home. In commercial structures, bigger versions of these motors relocate air with rooftop devices and huge air duct networks. They offer the exact same basic function dispersing conditioned air to every edge. The blower electric motor also sustains warm recovery ventilators and energy recovery ventilators, which bring fresh exterior air inside. The electric motor pushes the incoming air via the ducts after it is solidified. In workshops, a standalone blower electric motor can be repurposed to construct a dirt collection system or an effective store follower. The flexible style of a long-term split capacitor or ECM electric motor makes it a preferred amongst do it yourself fanatics for homemade wind tunnels, repaint booth exhausts, and also pottery kiln temperature level controllers. The electric motor’s capacity to run at variable rates offers it a large range of uses beyond the furnace. The exact same modern technology that keeps your home relaxing in January can additionally cool your electronic devices unit or ventilate a greenhouse. The blower motor is a peaceful workhorse that hardly ever obtains the credit score it is worthy of.

5. FAQs Concerning Replacing a Blower Electric Motor

Can I change simply the blower motor capacitor rather than the whole electric motor?
Yes, if the motor hums however does not spin, the capacitor may be the culprit. A capacitor is a little, economical part that offers the electric motor a starting boost. Testing and changing the capacitor initially is a clever, low-priced step. If the electric motor still does not run after a new capacitor, the electric motor itself is most likely dead.

For how long does it take to change a blower electric motor?
For a novice DIY job, reserved 4 to five hours. A specialist service technician can normally do it in under 2 hours. The time relies on exactly how simple the gain access to is and whether the blower setting up slides out smoothly.

Do I need to change the follower wheel when I replace the electric motor?
Not constantly. If the fan wheel is tidy, intact, and spins real, you can recycle it. Any splits, curved blades, or a wobbling movement suggests the follower wheel ought to be changed too. A broken fan wheel can shake off the balance of the new electric motor and reduce its life.

What is the difference between a PSC electric motor and an ECM electric motor?
A PSC electric motor runs at a solitary rate or a few set rates. An ECM motor is a variable-speed motor that makes use of less power and can increase or down slowly. ECM motors are quieter and much more efficient. They cost even more up front. You can not directly swap a PSC motor for an ECM motor without changing the control board in the majority of heaters.

Why does my new blower motor scent like it is melting?
A minor odor on the very first run is regular, as the motor’s manufacturing oils burn off. This should get rid of within an hour. A strong, persistent burning odor means something is incorrect. Shut the system down and examine that the follower wheel is not rubbing the real estate and that the wiring is proper.

How do I understand if the blower motor is the problem or another thing?

(how to replace blower motor in furnace)

If the heater ignites but the air never ever relocates, the blower electric motor is a prime suspect. Pay attention for a click from the control panel when the fan ought to start. If you listen to the click yet the electric motor remains quiet, the electric motor is likely bad. A multimeter can test for appropriate voltage at the electric motor connections. No voltage points to a control board or relay problem. Voltage present but no electric motor activity indicates an unsuccessful motor.