Model # BWS2

Internet #202067975

Master Flow 2 Speed Wholehouse Fan Control Switch
0050206396407

Master Flow

2 Speed Wholehouse Fan Control Switch

  • Two-speed fan control switch with cover plate
  • Comes standard with item 30BWHFS
  • Can be used with Master Flow item WHFS24M
$1995 /each
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Frequently Bought Together

Product Overview

  • Two-speed fan control switch with cover plate
  • Comes standard with item 30BWHFS
  • Can be used with Master Flow item WHFS24M
This 2 Speed Fan Control Switch allows fan control between Low Speed, High Speed and OFF for Master Flow Whole House Fans (NOT WHFTAN1 Model). This accessory can also be added to replace the pull chain switch in the 24 in. Direct Drive Whole house Fan to allow use of the Master Flow 12 Hour Timer (WHT36). Detailed installation instructions and diagram included.
  • For use with Master Flow Belt Drive and Direct Drive Whole House Fans
  • Installation instructions and diagram included
  • UL Listed
  • 120 V AC

Product Overview

  • Two-speed fan control switch with cover plate
  • Comes standard with item 30BWHFS
  • Can be used with Master Flow item WHFS24M
Model #: BWS2
Internet #: 202067975

This 2 Speed Fan Control Switch allows fan control between Low Speed, High Speed and OFF for Master Flow Whole House Fans (NOT WHFTAN1 Model). This accessory can also be added to replace the pull chain switch in the 24 in. Direct Drive Whole house Fan to allow use of the Master Flow 12 Hour Timer (WHT36). Detailed installation instructions and diagram included.

  • For use with Master Flow Belt Drive and Direct Drive Whole House Fans
  • Installation instructions and diagram included
  • UL Listed
  • 120 V AC

Specifications

Dimensions

Product Depth (in.)
1.56
Product Height (in.)
4.5
Product Width (in.)
3

Details

Color/Finish Family
White
Material
Plastic
Product Weight (lb.)
.5lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1-year Limited Warranty

Specifications

Dimensions

Product Depth (in.)
1.56
Product Height (in.)
4.5
Product Width (in.)
3

Details

Color/Finish Family
White
Material
Plastic
Product Weight (lb.)
.5lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1-year Limited Warranty

Questions & Answers

What is the amp rating?

What is the amp rating? at high? at low?
Asked by: FedPacBreaker
15 amps is the standard for any household electrical connection. The person who asked the question wanted to know what is the max amperage load that the SWITCH can handle on each of the "low" and "high" settings. For example, I have a rotary (infinite) dial which says "15 amps", as the other respondents stated, but also states "3.2 amp max load", which is not good, since the fan has a max of 5.7 amps! However, it has been connected and used for over 20 years, so, I'm not overly concerned (n.b., most whole-house fans may not work properly with rotary (infinite) switches (some mfrs even state so in their instructions/manuals), and, ironically, the slower the motor runs, the greater the likelihood of burning out any switch, due to heat build-up with higher resistance, so, make sure that your switch can handle the load (it would be nice if whole-house fan mfrs spent $10 more and put GFCI circuitry in the switch!)).
Answered by: skaizun
Date published: 2018-01-03

So from switch to fan I need black, white, red and ground wire?

Asked by: HH
You need white (neutral) and green (ground) as is required by code. If the fan is 120VAC, then black is traditionally consider hot, but there are effectively two hots, one marked A1 on the switch (low) and one marked B1 on the switch (high). Both could be black or one black and one any other color except white and green,
Answered by: sparky
Date published: 2017-10-13

can a single speed whole house fan switch be replaced with s 2-speed switch?

Asked by: Glo
Sure - just wire the fan to whichever switch connection you want, low or high. The fan will have only a black, white and green wire to it. L1 on the switch is the feed from your house power breaker and A1 is low speed and B1 is high speed. All is switch does is connect L1 to either A1 or B1. Make sure that the fan does not draw more amps than the switch is rated to handle. Mine is marked 15amps @120VAC.
Answered by: sparky
Date published: 2017-09-22

Does this have 3 wires

Asked by: Joe
There are three wires for the house wiring and two wires for handling the high and low speeds.
Answered by: nkdfun
Date published: 2016-12-14
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Customer Reviews

2 Speed Wholehouse Fan Control Switch is rated 4.1 out of 5 by 79.
Rated 3 out of 5 by from The switch is fine, however the 2 speed motor on the whole house fan WILL NOT RUN ON LOW SPEED. I... The switch is fine, however the 2 speed motor on the whole house fan WILL NOT RUN ON LOW SPEED. I am planning to replace the ' pulley ' on the motor with a smaller one, in hopes it will get the motor to start, I can start it by hand and it will run fine, but it will not start on it's own. I have been working on this install for 4 or 5 weeks installing a wooden frame in the attic, it has been too hot to work up there. So I was pretty disappointed after the install when it would not run on low.
Date published: 2017-09-26
Rated 2 out of 5 by from No, it doesn't compare to the original 2 speed switch that came with the fan. Also the markings o... No, it doesn't compare to the original 2 speed switch that came with the fan. Also the markings on the switch are not accurate. It's been wired correctly, but the speeds are reversed, the low is the high, but when set on high the fan seems to be moving the same speed as low.
Date published: 2017-08-15
Rated 4 out of 5 by from The switch is easy enough to install and serves the purpose. Too bad the manufacturer could not ... The switch is easy enough to install and serves the purpose. Too bad the manufacturer could not write installation instructions. Several pages of mumbo jumbo and even then I had to review posts to get the 3 to 4 sentences that allowed installation.
Date published: 2017-10-17
Rated 1 out of 5 by from I bought this switch for our whole house fan and installed in on 7/14/2017. It failed on 8/29/2... I bought this switch for our whole house fan and installed in on 7/14/2017. It failed on 8/29/2017 so that off and high position was "low speed" and low speed was "low". I would not buy this again.
Date published: 2017-09-02
Rated 3 out of 5 by from Worthless Installation instructions! I purchased this switch for my attic fan, as the old one ... Worthless Installation instructions! I purchased this switch for my attic fan, as the old one had failed after many years. The switch itself seems to work fine. My problem is the instructions that came with the switch. The fan switch installation instructions are worthless for a DIYer. The supposed switch diagram has tiny, practically illegible print and the diagram is complex and confusing. After a half hour of online research, I did figure out how to wire the switch correctly. The instructions for this switch should be a simple diagram showing, that looking at the front of the switch (rocker panel facing you, as in the product graphic), the are 4 screws on the sides of the switch: one on the top left, which is for the hot (black) wire coming in from the power source; a green screw on the bottom left, which is the grounding screw the bare copper ground wire connects to; and two screws on the right side of the switch: the top screw is for the wire to the high speed fan connection; and the lower screw for the wire to the low fan speed connection. The instructions could be so simple and so clear!
Date published: 2017-09-16
Rated 4 out of 5 by from SUITED MY NEED, BUT HAD TO GO ONLINE FOR A... SUITED MY NEED, BUT HAD TO GO ONLINE FOR A BETTER SCHEMATIC DIAGRAM
Date published: 2017-08-02
Rated 4 out of 5 by from This switch is working fine but I wish the detents were a little more crisp. When you switch fro... This switch is working fine but I wish the detents were a little more crisp. When you switch from low to off you can overshoot and move to high. Same for high to off. Otherwise it is working fine.
Date published: 2017-10-12
Rated 4 out of 5 by from How I would design this switch When a motor is first turned on it needs full voltage to come up to speed and overcome friction. It would have been better to design the switch in a OFF-HIGH-LOW than low off high.
Date published: 2017-08-01
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