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  1. #1
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    287

    Booster fan control

    Hello to all,
    I have a question regarding a booster fan control set up. I installed a booster fan for a bathroom exhaust duct circuit that is about 60 feet long (6" hard pipe) including elbows. The booster fan is about 5 feet before it exits the building.
    I thought I could use a "Cleveland Control" pressure sensing switch to turn on the booster fan (sensing pressure on the suction side of the booster fan). The problems is that not matter what I set the pressure switch at to kick on the booster fan, the fan is being turned on and then off because the booster fan is causing the pressure (in the exhaust pipe) to decrease fairly quick at the spot I have have my 1/4" hose connected into the hard pipe. I took pressure reading (with a manometer) further along the exhaust pipe to see if I can find a better spot, but the pressure decreases (goes from .10 water column to -5 water column causes booster fan to go off) even 20 feet away for the booster fan.
    I am thinking I might need some type of relay timer that would keep the fan running once it first starts for at least five minutes at a time.
    Funny thing is that most booster fans look like they come with the pressure switch mounted right at the booster fan.
    Hopefully someone's has some idea's about this issue.
    Thanks beforehand.

  2. #2
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    287
    I found this online
    http://www.unicontrolinc.com/CC%20PDFs/AFS-09.03.pdf
    Looks like the timer I was looking for. Install right on top of the pressure switch that I already installed.

  3. #3
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    287
    Has anybody had to set up a booster fan for a long bathroom exhaust duct circuit?

  4. #4
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,186
    Is the booster fan you are using a conventional propeller type?

  5. #5
    Join Date
    Jun 2007
    Location
    Greenwood Indiana (Indianapolis)
    Posts
    420
    FANTECH is the fan of choice and can be installed on a rio-stat.
    As iron sharpens iron so one man sharpens another Proverbs 27:17 NIV84

  6. #6
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,186
    Do you have access to to just wire the booster fan direct to the switch that the bath fan uses?

  7. #7
    Join Date
    May 2004
    Location
    Malden Mass
    Posts
    287
    54regcab, I don't have access to the bath fan wire or switch.

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