How To Repair A Relay Controller Furnace

How to Replace a Blower Motor Relay

A blower motor is a mechanism that allows HVAC systems to distribute heated air. This piece of equipment makes it possible for structures of all sizes to maintain a comfortable indoor climate. Blower motors are a common component in a habitation, commercial, and automotive HVAC systems.

The blower motor relay is an essential component in a functioning HVAC system. Replacing a malfunctioning relay restores your system'southward power to keep your habitation, building, or vehicle comfortable.

How Does a Blower Motor Work?

In an HVAC organization, the thermostat sets the conditions for date. Sensors in the thermostat monitor the space's temperature. When readings dip below the predetermined threshold, the thermostat signals the furnace to create heat.

The blower motor then pulls the warm air out of the furnace and powers a fan that pushes heated air out through vents and into the construction's rooms.

At that place are two main types of blower motors.

Single-speed units operate on an on/off switch. These motors operate at a consistent speed until the desired temperature is achieved.
Multi-speed models allow variable fan speeds, which can help alleviate cold spots and brand other temperature adjustments. Variable speed motors are also more than free energy efficient; since they tin command small-scale temperature shifts, multi-speed units don't utilise as much fuel to oestrus up larger spaces.

How to Identify a Failing Blower Motor Relay

In a blower motor, the relay supplies the power that allows the fans to broadcast warmed air. Essentially an on/off switch, the blower motor relay'south reactions start and terminate the heating process in HVAC systems by controlling the menses of current between the power source and the motor.

Blower motor relays tend to article of clothing out over time from the stress of constantly flicking back-and-forth.

These signs indicate a possible event with the blower motor relay.

When the blower motor does not reply at all, it may non be due to mechanical failure within the motor itself. Since the relay supplies the current that makes the motor motion, a nonresponsive motor may be the result of a worn out relay.

The blower motor relay does more than channel electrical current. Relays are a vital protection against electric surges. When the relay receives a jolt of stiff current or simply cannot manage and distribute its load, it volition send excess current into the fuse. This forces a shutdown which protects the entire organisation from electrical damage. Thus, diddled fuses could be a sign of relay issues.
Blower motor relays handle a large corporeality of current. Malfunctioning relays aren't able to distribute their load properly. This can cause the relay to retain excess oestrus and become warm to the touch. If left unaddressed, the estrus from a compromised relay can melt away the plastic casing and components around it. In extreme cases, the console or fuse box tin sustain damage too.

A malfunctioning relay means the HVAC system can't distribute the treated air until the problem is corrected.

Steps to Replace a Motor Blower Relay

Follow these four steps to successfully restore motor blower functions:

Review the owner's manual .

These guides ofttimes include troubleshooting steps that assistance y'all narrow down possible issues. Follow the guide's troubleshooting communication.

If these don't yield results or there are no instructions, spend some fourth dimension evaluating the fan's functionality.

Does it engage in one position only not another? Does it turn on and off when you jiggle the switch? Check the fuse console for loose, missing, or damaged components and supersede equally needed.

Disconnect the motor from the main power supply.

Apply the schematics included in your owner's transmission to locate a path to the relay. Allen wrenches, a deep-socket set, a small flashlight, and a few screwdrivers might be needed to navigate through the motor'due south inner workings.

The connector itself is usually a small blackness box with wires of various colors running from both ends.

In one case yous've located the switch, carefully disconnect the damaged relay.

Plastic connectors often secure relays into the system'southward housing. Use pressure to disengage these mechanisms without rendering them unusable.

Install the replacement switch. Perform a test to ensure a proper connection.

If replacing the switch doesn't resolve the outcome, supersede the blower motor relay.

Locating the correct relay can be tricky. Look for terms such equally a blower, Ac, or cooling fan relay on your schematics to point yous in the correct direction.

Bring your damaged relay with you to the automotive or electronics shop to ensure you're getting the right part for your blower motor.

Blower Motor Relays and Delay-on-Break Timers at Amperite

The blower motor relay is a small but vital component in all HVAC systems.

When troubleshooting efforts bespeak towards a compromised relay, a unproblematic replacement task quickly brings your systems back online.

Amperite supplies time delay relays that fit blower motors and delay-on-brand components that increase the efficiency and functionality of your climate control equipment.

Our blower motor relay applications include:

Air conditioning Organisation

A ordinarily closed delay-on-break TDR can be used to concur the blower motor in operation for a specified time after the cooling compressor has been turned off by the thermostat.

This allows the residuum cooling effect in the evaporator coil to exist used to provide boosted BTU's of cooling after the compressor has stopped.

Blower Motors

A commonly open delay-on-make timer tin can exist used to operate a blower motor which is to be delayed for a specified corporeality of time after an electrical, gas, or oil heater has been started.

This avoids motility of cold air into a room that is occupied past people.

Discover your new HVAC system parts at Amperite. For questions or more information on blower motor relays, experience free to contact us .