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Ceiling Fan Guide

TYPICAL CEILING FAN COMPONENTS ILLUSTRATED   

A     Yoke – Accepts downrod
B     Motor Cover – Covers motor and centers rotor and stator.
C     Bearing – Factory sealed insures smooth operation.
D     Rotor – Transfers the magnetic energy from the stator. The rotor is aluminum injected with pure aluminum in precisely angled slots to produce the power needed for optimum performance.
E     Stator
F     Switch Housing
G     Speed Switch
H     Reverse Speed

Ceiling Fan Components


Yoke – Connects the downrod to the ceiling fan.

Motor Housing – Covers internal motor parts. Aligns rotor and stator within motor.

Rotor – Converts electromagnetic force to drive fan blades. Made from steel sheets with slots set at a specific angle and injected with aluminum. Magnetic force travels along the slots to move the stator.

Steel Types – Some fans use silicon steel in their rotors and stators. Silicon steel is the most efficient transmitter of the magnetic force generated by the winding. Some fans use coldrolled carbon steel that does not perform as well as low carbon silicon steel.

Stator – Contains Main and Auxiliary windings that create the magnetic force used to drive the fan motor.

Switch Cap or Switch Housing – Contains switching mechanism for changing fan speed, rotational direction and in some cases light kit function.

Speed Switch – Changes fan speed.

Capacitor – All induction motors have a start/run capacitor to provide extra power to the fan motor for power needed to turn the fan blades. Triple capacitor fans have 2 extra capacitors that are used to reduce voltage entering the fan and control the fan speed. These capacitors can all be in one case or housing or they can be separate. Most common, is for all capacitors including the start/run, to be in one case or housing.

Triple Capacitor – Changes capacitor value to reduce voltage entering the fan motor.

Reverse Switch – Controls direction of motor rotation by changing the flow of electrical current through the fan windings.

Ceiling Fan Components


Bracket:The mounting bracket attaches to the electrical junction box. This must be a secure attachment in order for smooth operation to result.

Ball:The ball mounts to the mounting bracket with the ball slot sliding firmly into the slot on the bracket.

Canopy:The canopy of fans can be used on a flat ceiling up to a “33” degree pitch, which is the maximum for safety. Fans equipped with larger heavy duty mounting brackets go up to “45” degrees.

Ceiling Fan Components - Canopy


If the ceiling is pitched more than 33 degrees, a sloped ceiling canopy must be installed instead of the standard fan canopy. Installation varies from one brand to another. Directions included in the slope kit should be followed. Be sure the slope kit is compatible with the down rod of the fan.

Many ceiling fans come with a Hugger kit. The kit saves 4” – 6” inches in length when more room is needed because of low ceiling conditions. Also, installing blades closer to the ceiling will reduce the CFM’s of the fan.

Ceiling Fan Components - Mounting Kits


Safety Cable
Safety cables are included on many fans. Safety cables are required on all fans sold in Canada and for fans over 35 lbs. sold in the USA. For longer than normal downrod applications (CANCAB) cable extensions are available for all downrod lengths.

Downrod:
A ½” to ¾” diameter down rod that is from 4” to 8” long comes with almost every fan we sell. The down rods are available in additional lengths of 12”, 18”, 24”, 36”, 48”, 60”, and 72”. Fan down rods are not usually interchangeable between manufactures as the diameter can be different for each manufacturer.

Down rods that are longer than 72” are very difficult to balance. The customer should be aware that an 84” down rod may not be satisfactory to their needs.

Downrod Threading
When installing longer downrods, make sure the threaded end is installed in the ball. This allows the smooth end to make solid contact in the fan yoke and prevent wobble.

78” Leadwire:
Most fan downrods are threaded on one end to allow two downrods to be assembled for applications requiring more than 72”. A coupler must be used to connect the downrods together.

When two downrods exceed 72” extra leadwire must be added.

Ceiling Fan Components - Down Rods


Motor Housing
The motor housing is the home of the fan motor. The motor in quality fans has sealed bearings and windings with only the highest quality copper wire. The sealed bearings need no oiling or maintenance and the windings are varnished to prevent short circuits, and tested during and after manufacturing. Bearings separate the moving part of the motor, which is the rotor and the non-moving part which is the stator (contain 200’ of copper wire) they contribute to quite, vibration free operation. Fans use gaskets to dampen the vibration of the motor so that it is not transmitted into the room by the fan blades. Also, in the motor housing is the plug that will connect the plug in the switch housing.

Blade Irons
Quality fan blade irons are weighed and matched for balance.

Blades:
The blades are precision weighed and matched in sets for balance. Therefore, replacement of a single blade is not possible if smooth operation is to be maintained. Blades should always be replaced in sets. The pitch only high quality fans is 12 and 20 degrees. Most less expensive fans have a lower pitch. The higher degree of pitch allows for more air movement. With a pitch higher than 12 degrees, movement and noise will be much more noticeable as the speed of the fan is increased. Too little blade pitch can result in too much RPM that can create noise from the air swirling around the blade. Blade RPM, pitch, blade span, and motor size are balanced for best performance.

A fan's airflow results from optimizing four factors: Motor speed (RPM), the surface area of the blade, the pitch of the blade and blade sweep or diameter. A motor of a given size can only perform so much work. You can make it turn faster (higher RPM) but only at the expense of smaller blade area, sweep and pitch. So simply increasing the RPM does not mean more airflow.

Less Blades More Air:
More blades doesn’t mean more Air. More blades creates less open space between blades. This causes each blade to be in turbulent air that has passed over the blade just in front. If the blade area is the same a fan with three blades will move more air than six blades on the same fan with the same motor size. The number of blades is determined more on appearance and design than air movement.

Airflow is measured in cubic feet per minute, or CFM. For example a decorator 52” fan with 12 degee blade pitch can generate approximately 6000 CFM at top speed. A 42” fan (smaller motor) may generate only 5000 CFM.

Switch Housing
The switch housing contains the capacitor. This is the part that forces the electrical current into the motor. Capacitors are used to correct power factor. They jump start, so to speak, or produce the initial surge of electric current into the motor. A capacitor consists of two or more conducting plates, separated from one another by a dielectric non-conductor such as glass, mica, plastic or dry air. Higher end decorator fans have a triple capacitor. This enables the fan to have a very smooth start and quiet operation for the life of the fan. Home Centers usually buy the “best value” fans and these fans have only a single capacitor. On our LightingCatalog.com website we recommend Monte Carlo fans as a decorator fan that uses triple capacitors as a standard on all its fans. Basically, the more you spend the better the quality and life span.

The switch housing also contains the reverse switch which is used for winter operation of the fan. Always make sure the reverse switch is pushed on or off securely. If the switch is left in the in-between position, the fan will not run at all. Also, make sure the fan blades are completely stopped before changing direction of the fan motor.

A plug, identical to the one in the motor housing, is in the switch housing. The two are connected using the color coding. For easy light kit wiring, the switch housing can be removed from the motor housing by unplugging these plugs. The light kit is wired and the plugs are then reconnected. This is referred to as “quick connect”.

The switch housing of fans may be adaptable to other light kits. One must check to see whether or not the light kit is center mounted or with two side screws match that of the fan switch housing.

After punching out the center nut inside the switch housing, on center mounted light kit fans, the light kit all-thread is screwed into the switch housing and the wires are connected. When attaching glass to the light kit be sure that all the screws are tight and that light bulbs do not slant and touch the glass. This helps eliminate vibration noise emitting from the glass and/or light bulbs.




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