Fan Blower Controls
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We Sell Heating, Air Conditioning Parts & Supplies To You At Low Wholesale Prices!

Welcome to Our Fan & Blower Controls Page!

Hello Everyone! We Hope All of You Have A Happy, Healthful & Prosperous 2009!

This page contains some of the Fan & Blower controls that I use most often every winter and summer in our 16 year HVAC business. We wanted to make these parts available to you so you can be prepared if your heater goes out on one of those cold winter nights or hot summer days!

Let us Help You Repair your Heating System and Save Money!

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*Important: Please make sure that all electricity is turned off before attempting to troubleshoot or repair Heating & Air Conditioning Equipment.

White Rodgers Fan Control Center Relay Model #90-113

First, we have a furnace and air conditioning  part that goes out more often in the summer months than in the winter. The part is called a Fan Center Relay.

Problem: Fan will not come on in the "ON" position or your fan will not come on when you turn the thermostat down in the air conditioning mode.

Solution: Purchase a new fan center relay or fan sequencer. A sequencer looks like the picture below. We have sequencers for sale on the following page: Please click here if you are interested in sequencers. Please see the information below for fan center problems or fan limit control problems.

Above picture of a sequencer:

Purpose of the Fan Center Relay: The purpose of the fan center relay is to provide low voltage control (24 Volts) of line voltage circuits (110 volts) and can be used to control two-speed blower motors and auxiliary circuits in heating or cooling equipment. Many of the newer furnaces do not have fan center relays, but many of the older furnaces and some new furnaces still do. You would need to look inside your furnace to determine if you have a fan center relay. Some of the relays are attached to a junction box where the power comes into the furnace, and others are located in the blower compartment attached to the blower housing. You might not have the relay that we sell below. Many of the newer furnaces are control by electronic circuit boards.

Troubleshooting procedure:

1. Make sure that your furnace switch is "ON" the furnace blower compartment door is on and secure. Move the lever on the thermostat to the "ON" position. The fan blower should come on. If it doesn't then you probably have loose or burnt wires in behind the relay or you may need a new fan relay or circuit board.

2. Many times wires are either loose or burnt behind the fan center relay. First make sure your furnace power is turned off. Remove the fan center relay and inspect it for loose or burnt wires. Repair wires and reinstall fan center relay. Turn the power to the furnace back "ON." Hopefully you have fixed the problem!

3. With the furnace on use a multimeter set to AC Volts, to test between terminals "R" and "C." You should get a voltage reading of approximately 24 volts AC. If you do not get any voltage reading, your low voltage transformer might need replacing or you are not getting high voltage to power the transformer. Sometimes furnace manufacturer's connect the furnaces transformer through the limit control so if your furnace over heats or if the limit is stuck open then you will not get power to the transformer. There are quiet a few variables that can occur to cause furnace problems. I believe I have covered the main problems. If you have the fan center relay like we sell below the low voltage transformer is combined with the fan relay. Below we have pictures of the fan center relay with an opportunity for you to purchase. This relay will work on motors up to 3/4 horse power.

 

             

                       Fan Center Top View             Fan Center with Instructions               Fan Center side view:

 

          

 Fan Center box with specifications:    

 

White Rodgers Fan Control Center Relay Model #90-113

 Price $32.00
Quantity

International Refrigeration Products SPDT 24 volt Coil Fan Relay 

Part #90-370

"SPDT" stands for Single Pole Double Throw.

You might need one of these relays if your fan will not shut off, runs all the time, or will not come on in the "Fan On" position.

I see this relay in some of the older furnaces so I wanted to make it available for you to purchase. These relays are used to cut the fan on and off when the thermostat is set in the air conditioning mode or when you move the thermostat to the "Fan On" position. The low voltage usually the green thermostat wire is wired to terminal #1. The low voltage common wire to terminal #3. One line voltage wire is attached to terminal #4. The high speed blower wire usually black is attached to terminal #2. When the thermostat calls for air conditioning or "Fan On" the 24 volt coil is energized, the terminals 4 and 2 close. This causes the fan to come on in high speed. When your home cools down and the thermostat cuts the air conditioner off, the low voltage coil terminals 1 & 3 are deenergized, and the fan goes off. Sometimes these little relays stick which causes the fan to run all the time or will not make good contact, which causes the fan to not run in the "Fan On" or air conditioning mode. Below we have pictures with an opportunity for you to purchase.

       

This relay is rated 12 Full Load Amps with 125 Volts AC

We are getting the above Fan Relay from Beacon Components instead of White-Rodgers.

The Beacon relay has the same specifications as the White-Rodgers.

Beacon SPDT 24 Volt Coil Fan Relay Part #90-370

 Price $20.00
Quantity

International Refrigeration Products 2PDT Switching Relay

Part #90-340

I see this relay on many furnaces and HVAC applications. "2PDT" means Two Pole Double Throw. When the 24 volt coil is energized (through the bottom two terminals) terminals #1 and #3 close the circuit at the top and terminals #4 and #6 close at the bottom. These terminals would be called "NO" (Normally Open) because these terminals are normally open until the 24 volts are applied to the coil.  When the coil is not energized terminals #1 and #2 are closed and terminals #4 and #5 are closed. These terminals would be called "NC" (Normally Closed) because these terminals stay closed until the 24 volt coil is energized. I hope this explanation will help you understand what the markings on the relay represent. The specifications on this relay are: 24 volt coil, rated at 12 FLA (Full load amps) for 125 volts, 6 FLA (Full Load amps) at 277 volts. 60 LRA (Locked Rotor Amps) at 125 volts and 35 LRA at 277 volts.

International Refrigeration Products 2PDT Switching Relay Part #90-340

 Price $18.00
Quantity

American Standard, Trane Air Handler Fan Time Delay Relay

Part #RLY02807

If your fan on your American Standard or Trane air handler will not come on, or will not go off then you might need the fan relay that we have listed below. The new solid state relay pictured on the left replaces the old style relay pictured on the right.

 

 

             

                              Above Pic of New Air Hander Relay:      Above pic of old style air handler relay:

Trane, American Standard Air Handler Fan Time Delay Relay Part #RLY02807

 Price $28.00
Quantity

Honeywell L4064 Fan Limit Controls

Important: Please make sure that all electricity is turned off before attempting to troubleshoot or repair Heating & Air Conditioning Equipment.

What is a fan limit control? Fan limit controls are very important for your safety and for proper furnace operation. Fan limit controls that we sell are suitable for all types of forced air heating systems. The fan limit control provides high limit control of the burners and control of the fan motor according to the furnace plenum temperature. When your furnace burners come on the fan limit control measures the temperature inside the furnace's plenum. When the temperature of your furnace gets warm enough and to the preset temperature on the fan limit control, the control clicks on and causes the furnaces blower fan to kick on and circulate air throughout your home. When your thermostat is satisfied the burners kick off and the fan continues to run until your furnace's plenum cools down to the fan OFF set point on your fan limit control. The fan limit control turns the fan off. The fan limit control is an important safety device. Let's say that your furnace's burners come on but the blower motor is bad and will not start. Without the fan limit control your furnace could over heat and cause a fire! The fan limit control shuts the gas burners down so the furnace will not over heat and cause a fire. The Honeywell fan limit controls that we sell below have a manual fan switch that can be used to override the fan set point and keep the fan running continuously. 

Problem: Your fan on your furnace runs all the time and will not shut off. 

Solution: Check to make sure the fan is not in the fan "ON" position on your thermostat. Check to make sure your air conditioning fan relay is not stuck in the on position. The contacts on your air conditioning relay could be welded closed, causing the fan to run all the time. You might try lightly tapping on the Air conditioning relay to see if the fan will go off? You really need an AC Volt meter to check this out. You probably need a new Fan Limit control. There are many different types of controls. We will be adding more in the future.

Problems:  Your fan shuts off too soon, cycles off and comes back on within 30 seconds to a minute, or runs too long and will not shut off until it is blowing cold air. You could turn you electrical power off and adjust the little tabs on your fan limit control. 

Solution: You can sometimes adjust the little tabs on your fan limit control to make in run longer or shorter. The fan "OFF" setting on the fan control below is set to go off at 90 degrees. On at about 110 degrees and the limit that shuts the gas burners off is set at 190 degrees. You can lightly push in on these tabs and adjust them to the desired temperature. I always lightly push and hold the center round dial while adjusting the tabs so it will not bend or break the limit control spring that is attached to the dial and runs in back of the limit control. Please see the picture below. If your adjustments do not work, or if your fan limit control becomes too inaccurate then you might consider purchasing one of the Honeywell fan limit controls we sell below. 

 

 

 

 

Above Honeywell Fan Limit Control Out of Box:

 

Below we have pictured three Honeywell fan limit controls with an opportunity for you to purchase at a low wholesale price. These controls are sold based upon their insertion length. We have the 5 inch, 8 inch and 11 inch insertion length fan limit controls. All controls are in stock and can be shipped the day you order! We have same day shipping on orders received before 3:00 PM. Eastern Standard time. We hope you can find your fan limit control below!

 

We would love to have your business!

 

*Please Note the L4064 B Controls below do not have the "Timed On" heater. The Honeywell L4064 W fan limit controls, located below the L4064B Fan Limit Controls have the "Timed On" heater installed in them.

 

Honeywell 5 Inch Insertion Fan and Limit Control Model #L4064 B 2228  

Price $58.00 Each
Quantity

 

Honeywell 8 Inch Fan and Limit Control Model #L4064 B 2236  

Price $58.00 Each
Quantity

 

Honeywell 11 Inch Fan and Limit Control Model #L4064 B 2210  

Price $58.00
Quantity

Honeywell Combination Fan & Limit Control with "Timed On" Feature

If you have a Fan Limit Control that has the heater in the middle, "Timed On,"  like the picture below then we have the combination fan limit control for you. 

 

 

 

Honeywell L4064 W 1080 Timed-On Combination 5 Inch Insertion Fan & Limit Control  

Price $85.00 Each
Quantity

Honeywell L4064 W 1098 Timed-On Combination 8 Inch Insertion Fan & Limit Control  

Price $85.00 Each
Quantity

 

Honeywell L4064 W 1106 Timed-On Combination 11 Inch Insertion Fan & Limit Control  

Price $85.00 Each
Quantity

Sorry, No Returns on Electrical, Electronic Products, Fan Controls, Once they Have Been Installed.

More blower fan parts coming soon! Please check back often. Thank You!

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Please Remember Safety First

 

Please read our disclaimer and safety related information below before attempting to do any type

 

 of Heating or Air Conditioning Repair. We do not want to see anyone get hurt or shocked! Thank You!

*Please always turn off all electrical power, and discharge the capacitor/capacitors (if working around capacitors) before attempting to inspect or repair any heating & air conditioning equipment. Check to make sure the electrical power is off with a reliable meter. I have never been shocked by a capacitor (knock on wood) and rarely see them discharge, but it is a good idea to discharge them before working around them. Please read below. It tells you how to discharge a capacitor.

Please read the following: 

How To Discharge The High Voltage Capacitor: The capacitor is discharged by creating a short circuit (direct connection) between the two capacitor terminals and from each terminal to chassis ground (bare metal surface). Please make sure that you are touching the insulated screw driver handle and not the metal part of the screw driver before attempting this procedure.

  1. Do this by touching the blade of an insulated-handled screw driver to one terminal, then slide it toward the other terminal until it makes contact and hold it there for a few seconds. (Sometimes this can result in a rather "pop!")

  2. Repeat the procedure to create a short between each capacitor terminal and chassis ground.

  3. If the capacitor has three terminals, use the same procedure to create a short circuit between each terminal and then from each terminal to ground.

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