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Fan limit switch wiring details:
This article describes in detail the installation & wiring of furnace combination controls, also commonly called the "fan limit switch" on warm air heating systems.
The photo at the top of this page shows all of the controls and wiring terminals in a Honeywell combination fan and limit control installed horizontally on a gas furnace.
This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Advice for Installing and Wiring the Furnace Combination Control Fan Limit Switch on Heating Systems
Here we include both old and current guides to Installing & Wiring Fan Limit Switches on Warm Air Furnace Heating Systems for all major brands of fan limit control switches used on heating furnaces and other fan systems.
In this article series we also discuss the following:
Furnace Combination Control Operating Temperature Range & Limits;
Where to mount the furnace Fan-Limit Control; Honeywell Combination Furnace Control type L4064 wiring hookup explained and illustrated in detail;
Wiring Notes for the Combination Furnace Control L4064B; Honeywell L4064B Limit Wiring When Controlling Low Voltage - Control wiring Details
The sketch at above/left, courtesy of Carson Dunlop, shows an improper (too high) upper limit setting - this is an unsafe fan-limit switch setup which is likely to allow the furnace to overheat, risking heat exchanger damage and dangerous carbon monoxide leaks. [Click to enlarge any image]
The following example of wiring a fan limit control switch is based on advice from the Honeywell Tradeline L4064B. Check the test specifications provided by the manufacturer of your particular control.
Furnace Combination Control Operating Temperature Range & Limits
The switch portion of this Honeywell Fan Limit control can tolerate 190 °F. and the sensing element can handle up to 350 °F.
The control can handle 120V and 240V devices and can also be wired to control low-voltage devices. The electrical wiring used must also be rated for suitable temperature exposure (Honeywell advises wiring rated for 167°F).
At 120V the control can switch fan motor loads at 14 Amps full load (84 Amps locked rotor load), and the limit switch (presumably an oil or gas burner) can handle up to 8 Amps full load (48 Amps locked rotor load).
When controlling 240V devices the fan or blower control can handle up to 7 Amps full load (42 Amps LRA) and the limit switch can handle 4 Amps full load (24A LRA).
Where to mount the furnace Fan-Limit Control
This furnace combination control is mounted on the furnace in a location where the bimetallic spring/probe (shown above in this article) will protrude into the warm air plenum to sense furnace air temperatures there. Each furnace manufacturer will provide instructions of where, on their system, the air temperature should be monitored for control purposes.
The reason the control manufacturer warns that the control tip should not touch any internal surfaces of the furnace is that doing so can cause improper reading of furnace air temperatures or could damage the control or prevent free movement of the bimetallic spring in response to temperature changes.
Of course if you are replacing an old control that has failed, just mount the control in the same location that held the prior unit.
When replacing an old furnace limit control, make sure that the new control has a sensing tip of the same length as the unit being replaced. Otherwise the new control may not work safely.
The manufacturer provides details for surface mounting, rigid-bracket mounting, or swivel-mounting of the control. Which of these methods you choose depends on what mounting is needed to place the sensor probe in the proper location in the air plenum.
Wiring the Furnace Combination Fan & Limit Control using the Honeywell L4064B as an Example
This control can be wired to serve as a safety LIMIT switch on a furnace by wiring just the limit terminals on the control. When the device is used both to control a furnace fan on-and off as well as serve as a LIMIT switch, then all four terminals are used.
Fan control wiring: As Honeywell's illustration shows, the two fan terminals are on the upper and lower left side of the control.
Line voltage is wired at the bottom left push-in terminal.
Load voltage (to the fan) is wired at the upper left push-in terminal.
Limit control wiring: As the illustration shows, the two LIMIT terminals are on the upper and lower right side of the L4064B control.
The Line (power in) wire is connected to the lower right push-in terminal, and the Load (wire to oil or gas burner) is wired to the upper right push-in terminal.
The wiring diagrams shown in more detail below are typical for wiring the furnace combination control on heating systems.
Remember that all electrical wiring of furnace controls (or any other electrical devices) must comply with national and local electrical codes as well as the specifications of the control manufacturer and the furnace manufacturer.
Wires are connected to the control using push-in terminals. A wire strip gauge is provided on the left side of many versions of this control.
The control used for our photos came with additional push-in terminals (Part # 137813) that can be used to convert the push-in wiring connectors to screw-terminal connectors.
This is a great idea if you expect to be changing wiring from time to time. (Dr. Jess Aronstein's research has demonstrated that repeated-use or re-use of push-in type terminals on electrical receptacles does not provide a very reliable connection. This may be true for this control as well.)
Fan Limit Switch Installation Manuals 1970 to Present, for Camstat, Cemco, Goodman, Honeywell & White Rodgers
Camstat Fan Limit Control Wiring
Cam-stat FAL7C-05TD-120-A Fan & LImit control (shown above) [Click to enlarge any image]
CAMSTAT FAN LIMIT SWITCH CamStat FALTS57C05T120A MANUAL [PDF] The Cam-Stat F566 & F567 include a 24VAC 0.8A "heat assist" circuit that turns blower on using a timed delay independent of the actual plenum temperature. This series includes Cam-Stat F562, F563, F564, F566, F567. retrieved 2018/03/05, original source: Supco. Op. Cit.
Cam-Stat is a division of Supco. The Cam-Stat fan limit switch provides a dial-adjustable FAN OFF temperature ranging from 90°F to 120°F, a FAN LIMIT temperature ranging from 150°F to 250F, and typically a fixed differential of 30°F. [Click to enlarge any image]
Website Excerpts: The Columbus Electric TC Series FIRESTAT is a push-button manual reset limit control designed expressly for fire prevention in warm air ducts.
It may be used with gas, oil, or electric forced warm air heating systems. One or more FIRESTATS should be installed in duct work at critical temperature locations such as down-stream from electric heaters, points where duct work is in close proximity to flammable materials, etc.
FIRESTATS may be used in low voltage or line voltage circuits and are usually wired to open [the] circuit to both heat source and blower when duct air temperature exceeds the temperature setting [of the FIRESTAT safety device].
If more than one FIRESTAT is connected to control a single heat source, the FIRESTATS must be connected in series. A typical [FIRESTAT] wiring diagram is shown below [edited for clarity by InspectApedia.com].
The TC Duct Limit Controls
contain a Helix Bi-Metal that
senses rapid increases in duct
temperature such as fire. The
Bi-Metal causes the normally
closed contacts to open and
turn off the power
Available in either adjustable
[TC-100, TC-105, TC-108] or fixed temperature [TC-205] models. These firestat limit switches are installed in air ducts to shut down heating, air conditioning and ventilation equipment when air temperature in duct exceeds a pre-set limit.
The Duct High Temperature Limits feature a helix bimetal element that senses rapid increases in duct temperature, such as those caused by fire. The high temperature limit then operates an SPST switch that opens with a rise in temperature.
A manual reset button reactivates the temperature limit after the high-temperature condition has cleared. These duct high temperature limits are indispensable in specialized HVAC applications and Building Automation Systems.
COLUMBUS ELECTRIC COMBINATION TEMPERATURE CONTROL [citation and manuals wanted].
Columbus Electric, originally in Columbus Ohio, U.S. is a division of TPI Corporation. The company produced HVAC controls including fan limit controls such as the unit shown here, line voltage electric heat wall thermostats, and other controls and equipment.
Contact: Columbus Electric Division of TPI, PO Box 4973, Johnson City, TN 37602 USA, Tel 800-251-7828, Fax 423-477-0545
TPI Corporation, Website: www.tpicorp.com, Tell: 1-800-682-3398. The company's current product lines include Markel Products, Raywall, and Fostoria and a very large range of HVAC equipment and controls.
Columbus Temperature Control, Columbus Temperature Control,
1053 East 5th Avenue
Columbus OH 43201 USA Tel: 614-294-6216 markets under Distech Controls and currently specializes in networked, electronic interfaces and controls for security, HVAC, lighting, access control, energy menagement systems.
Thanks to reader Larry C. for the Columbus Electric Combination Temperature Controller photographs, 2018/07/25. He wrote that this control was used on a dual-zone heating and air conditioning system.
This L4064B, L4064R limit controller is a universal replacement for older furnace fan limit controllers. Here is the difference between the L4064B and L4064R, excerpting from the document above:
These combination warm air fan and limit controllers
are suitable for various types of forced air heating
systems. The controllers have 2 switches; one which
opens the limit circuit if the plenum temperature
exceeds the preset safety limit; it resets automatically.
The other switch turns the fan on and off.
The fan is
turned on and off according to plenum temperature.
The L4064R has a special high temperature range
suitable for gravity heating systems.
All models may
be used as limit controllers by wiring only the limit
side. Limit contacts are suitable for both line voltage
and low voltage. For low voltage applications, the
brass jumper must be removed. ... Follow furnace or burner manufacturer’s instructions,
Maximum element temperature is:
L4064B—350 ºF (177 ºC).
L4064R—250 ºF (121 ºC) above limit setting.
Maximum switch temperature is:
L4064B,R—190 ºF (88 ºC).
HONEYWELL L4064T (ca 1970) wiring diagram shown below thanks to reader Haydn Chambers, used an extra set of spade terminals in the center of the control - these were connected to low-voltage terminals that provided a fan-timer heater function such as shown in the illustration that includes a low-voltage (24VAC) gas valve and thermostat.
Above: Honeywell L4046T Wiring diagram.
[Click to enlarge any image]
Below: Honeywell L4068A-C-E-F Wiring Diagrams from the manual given just below.
Honeywell L4064B Limit Wiring When Controlling Line Voltage (120V or 240V) - Control Installation Notes
In most applications in the U.S. and Canada the Honeywell L4064B combination control is used to switch on and off 115V-120V or 240V fans and heating burners, or on some gas equipment, the burner controls (the LIMIT switch function) operates at low voltage.
The left-illustration shows normal wiring for this set-up. The fan or furnace blower motor is controlled by the two left connections (green dots); the furnace limit switch which will turnoff the burner if the temperature limit is reached is controlled by the two right connections (red dots).
Here the furnace limit switch is controlling a line-voltage device. The colored triangles refer to notes given below.
The right-hand illustration above shows the wiring for controlling line voltage when the jumper or pull out tab has been removed. You can see that in effect the installer in effect is replacing the missing jumper by installing a common wire to both terminals on either side of the contacts where the jumper was removed.
This important detail permits this control to be used to control line voltage (120V) devices even if the jumper has been removed or the paper pull-out tab on older controls has been lost.
Wiring Notes for the Combination Furnace Control L4064B:
Be sure to add a power disconnect switch and overload (fuse or circuit breaker) protection on this circuit. Note that the jumper or paper tab has been left in place.
Wires to control low-voltage equipment - in this case the jumper has been removed.
Additional installation details for this control in the latest form are available from Honeywell (cited below).
Honeywell L4064B Limit Wiring When Controlling Low Voltage - Control wiring Details
Pull the tab at the bottom of the Limit Control for use with low voltage equipment
To prepare the L4064B furnace control for use in a low-voltage application (typically 24VAC), simply remove the small red cardboard tab shown at left or break off the copper jumper between the two contacts in the same location on newer models of this control.
The brass jumper is the breakaway type. It must be removed when the limit is used in the low voltage circuit.
To remove jumper, break
with a needlenose pliers and remove completely. Once removed, it is not replaceable.
If you make a mistake and remove this tab and then realize that you need to use this control to handle line voltage (120V or 240V) you can simply install a jumper wire as we show in the right-hand illustration just above on this page.
Reader Question: I forgot to remove the brass jumper on a new fan limit switch installation
I installed a new fan limit switch but in my rush I missed removing the brass jumper for low voltage.
I tested it and it started and stopped. I can't seem to find the damage.
Do i need to buy and replace the limit switch again? I've checked the fuses and replaced both but still wont work. what else do I need to check. thanks
Dennis, I'm sorry to have to play it safe, but reading Honeywell's warning that the control could be damaged, I just wouldn't take a chance.
Watch out: A problem is that just as a bent spring can change how a switch performs, internal damage could be subtle and not visible, but the fan limit may not perform safely.
Certainly you can go through the recommended fan limit switch test procedures described above on this page to confirm that the swtich is doing what it is intended to do.
If you are still concerned I'd repalce the switch rather than take a chance or lose sleep over it.
How to Wire the Honeywell L4064B to Control Low Voltage Equipment
The diagram at left shows how to wire the Honeywell L4064B combination furnace control when it is used to control low-voltage equipment.
This tab is found protruding from the control near the center of the bottom of its face. You'll see embossed on the control above this tab the words "Remove for Low Voltage".
Newer versions of this control have a brass jumper in the same location. The brass jumper is broken off for low-voltage use and is not replaceable once it has been removed.
The fan or furnace blower motor is controlled by the two left connections (green dots).
The furnace limit switch which will turnoff the burner if the temperature limit is reached is controlled by the two right connections (red dots). Here the furnace limit switch is controlling a low-voltage device such as a heating furnace gas valve. The colored triangles refer to notes given below.
Be sure to add a power disconnect switch and overload (fuse or circuit breaker) protectionOn this circuit. Note that the jumper or paper tab has been left in place.
Wires to control low-voltage equipment - in this case the jumper has been removed.
Before wiring this or any control be sure to obtain the latest data from the manufacturer of the control and the furnace on which it is to be installed. Additional installation details for the Honeywell L4064B Combination Fan Limit control in the latest form are available from Honeywell.
After wiring this control make sure you've use the proper settings by reading
over FAN LIMIT CONTROL SETTINGS and then be sure you test the combination fan and limit switch for safe and proper operation.
How to Check that the Fan Limit Switch is Working Properly
Excerpting from the 2017 document given below:
When installation is complete, disconnect the fan
motor circuit at the L4064.
Turn on power and set
thermostat to call for heat.
Burner should come on
and limit controller should shut burner off when
plenum temperature reaches the limit set point.
off power, reconnect the fan switch, turn on power
and again set thermostat to call for heat.
should start when plenum temperature has reached
Honeywell L4068 & 4069 Fan & Furnace Controller Wiring
Includes a diagnostic table de-coding the green, amber, and red LED flash codes used in troubleshooting the furnace.
WHITE-RODGERS-FAN-LIMIT-CONTROL-5D51-35-78-90-INSTALLATION [PDF] White-Rodgers Division
Emerson Electric Co.
9797 Reavis Rd., St. Louis, Mo. 63123-5398
(314) 577-1300, Fax (314) 577-1517
9999 Hwy. 48, Markham, Ont. L3P 3J3
(905) 475-4653, Fax (905) 475-4625 retrived 2018/03/04, original source: http://www.royallfurnace.com/support/components/fan-limit-switch.pdf in English and French. Excerpts: This fan and limit control combines, in one enclosure, a
fan switch with an adjustable differential which operates
the blower in a forced warm air furnace and a limit switch
with a fixed differential which automatically shuts off the
burner if the furnace temperature exceeds a predetermined
A summer fan switch is incorporated in this control to
provide a convenient method for manual operation of the
fan for air circulation during the summer. Cette commande de ventilateur et de limite combine, dans un
seul boîtier, un interrupteur de ventilateur avec une différence
réglable qui fait fonctionner le ventilateur dans un système à
air pulsé et un interrupteur de limite à différence fixe pour arrêter
la chaudière si sa température dépasse une température
Un interrupteur de ventilation pour l’été est incorporé dans cette
commande pour fournir une méthode pratique d’utilisation
manuelle du ventilateur pour faire circuler l’air en été.
Watch out: To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper
and dangerous operation.
Following installation or replacement, follow
appliance manufacturers’ recommended installation/service
instructions to insure proper operation.
Do not use on circuits exceeding specified voltages.
Higher voltages will damage control and
could cause shock or fire hazard.
If in doubt about whether your wiring is millivolt,
low or line voltage, have it inspected by a qualified
heating and air conditioning contractor or a
Above: Wiring diagram for the White Rodgers Fan Limit Control used at line voltage. [Click to enlarge any image] adapted from the White Rodgers 5D51 installation instructions cited here.
Below: Wiring diagram for the White Rodgers Fan Limit Control used with low voltage equipment. Note that the jumper is remoed for use with low voltage equipment, also adapted from the White Rodgers 5D51 installation instructions cited here.
Other Limit Controls, Wiring & General Information
Warning on Wiring Limit Controls and Switches in Reverse Polarity
Question: is it ok to wire the limit switch backwards with wires reversed in polarity from the instructions?
2018/10/01 John Ford said:
Line voltage is wired at the bottom left push-in terminal.
Load voltage (to the fan) is wired at the upper left push-in terminal.
What happens if these are reversed & will it ruin the limit control switch
Reply: do not wire switches in reverse polarity: damage risk
Thanks for a critical question, John as we've all pushed a wire into the wrong connector from time to time.
Watch out: Warning about wiring fan limit switches or other controls in reversed polarity:
I don't know what specific fan limit switch you are using reverse wiring effects and I suspect that the risk of damage from wiring in reverse polarity is manufacturer and model-dependent as well as dependent on an additional detail I'll note. Here are some general remarks:
Most switches will "work" 'when wired in reverse polarity or "backwards" in that they turn-on or off the switched device as needed.
However wiring in reverse polarity can damage electrical components and can also be unsafe.
A review of THE BASICS of LIMIT SWITCHES [PDF] an excellent document on limit switches by Eaton, cited in detail below, reminds us that mis-wiring a switch as you asked can cause arcing when the switch operates; that arcing in turn can damage the switch or devices connected to it.
Limit Control Wiring Polarity Observations
Polarity is a term which is used to describe the relationship between the load and line connections in a multicircuit switch.
Take a set of contacts with terminals that are made electrically common. If a line to line short circuit does not occur, these contacts are said to be connected to the same polarity.
If a line to line short circuit does occur the contacts are said to be of opposite polarity.
Some limit switches have their sets of contacts isolated from each other on the same pole. They are said to have electrically isolated outputs and are labeled as such.
Most devices, however, do not have isolated sets of contacts on the same pole and care must be taken to observe polarity.
Failure to do so can cause permanent damage to the switch, the wiring or both.
In some electronic devices leaving a live connection to the side of a circuit that's normally not energized can sometimes cause damage to a circuit or circuit board - a classic example is the effect of stray currents on the neutral wire in a circuit that damage an appliance or trip an AFCI.
When wired improperly the heating system is also unsafe. For example as you'll see in the Honeywell schematic I include below, if you reverse line and load wiring you are keeping the motor and other parts of the system always "energized" - that condition, combined with any of a number of errors or events, could shock someone.
Here is what Honeywell says, using the L4068A-series controller as an example
the “hot” wire from the power supply to the upper
left terminal. On L4068, connect the fan motor to the bottom terminal (marked LOAD); connect limit
switch, if wired in the line voltage circuit, to the upper right terminal.
Eaton, THE BASICS of LIMIT SWITCHES, [PDF] Eaton, a power management company, corporate headquarters in Dublin, Ireland, Tel: US: +1-877-386-2273, 800-426-9184, Canada
+1-828-651-0786, retrieved 2018/10/01, original source:
Note: excellent, comprehensive review of wide range of types of limit switches and their operation.
Excerpt from Introduction: Presence Sensing is the act of detecting the presence or
absence of an object with a contact or non-contact sensing
The sensors then produce an electrical output signal
that can be used to control equip-ment or processes.
Mechanical limit switches are contact sensing devices widely
used for detecting the presence or position of objects in
The term limit switch is derived from
the operation of the device it-self.
As an object (or target)
makes contact with the operator of the switch, it eventually
moves the actuator to the "limit" where the elec-trical
contacts change state.
Through this mechanical action, electrical contacts are either
opened (in a normally closed circuit) or closed (in a normally
Inductive proximity, capacitive proximity, and
photoelectric sensors perform this same process through noncontact
NORA, LIMIT CONTROLS & THERMOSTATS, [PDF] National Oil Heat Research Alliance, 600 Cameron Street,
Alexandria, VA 22314 USA, Tel: 703.340.1660,
... The National Oilheat Research Alliance, ... was authorized by Congress in 2000 to provide funding that would allow the oilheating industry to provide more efficient and more reliable heat and hot water to the American Consumers. As a government sanctioned “check-off” program, $0.002 is collected at the wholesale level on every gallon of heating oil sold. While it is mandatory, the benefits greatly outweigh the minimal cost.
The four key arms of NORA are Consumer Education, Professional Education, improving energy efficiency and safety, and Research Consumer Education allows NORA to reach out to the consumer and show that oilheat is a clean, safe, efficient and modern form of heating.
This communication is essential to the industry’s survival.
Professional education, through the Technician Certification Program, provides continuing education, training and certification for oilheat service technicians. Lastly, NORA funding has helped a number of manufacturers to develop highly efficient heating equipment, such as condensing boilers and furnaces, variable speed furnaces, variable burners and number of other technologically advanced, highly efficient products.
Continue reading at FAN LIMIT SWITCH TROUBLESHOOTING or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
Domestic and Commercial Oil Burners, Charles H. Burkhardt, McGraw Hill Book Company, New York 3rd Ed 1969.
National Fuel Gas Code (Z223.1) $16.00 and National Fuel Gas Code Handbook (Z223.2) $47.00 American Gas Association (A.G.A.), 1515 Wilson Boulevard, Arlington, VA 22209 also available from National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. Fundamentals of Gas Appliance Venting and Ventilation, 1985, American Gas Association Laboratories, Engineering Services Department. American Gas Association, 1515 Wilson Boulevard, Arlington, VA 22209. Catalog #XHO585. Reprinted 1989.
"Warm Air Heating Systems". Instructional Technologies Institute, Inc., 145 "D" Grassy Plain St., Bethel, CT 06801 800/227-1663 [home inspection training material] 1987
Heating, Ventilating, and Air Conditioning Volume I, Heating Fundamentals,
The ABC's of Retention Head Oil Burners, National Association of Oil Heat Service Managers, TM 115, National Old Timers' Association of the Energy Industry, PO Box 168, Mineola, NY 11501. (Excellent tips on spotting problems on oil-fired heating equipment. Booklet.)
Thanks to reader Dan Somerville for technical editing assistance 01/09/10
Honeywell Corporation, Minneapolis, MN 55408. Honeywell has sales offices in all principal cities in the world and has manufacturing facilities in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. Honeywell Form Number 60-0450 7-75, residential division. Honeywell's latest product data for this type of control can be found in English at http://customer.honeywell.com/Techlit/Pdf/69-0000s/69-0117.pdf
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