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  1. #1
    Join Date
    Feb 2005
    Posts
    46
    I believe the AprilAire 700 series has an outdoor sensor to control the unit. On the other I've been told stats like some in the WR line can provide the control. The only possible downside I've been told with the outside control is that it's possible to over humidify the house increasing the chance of mold.

    What is everyone's choice here - inside or outside control?

    BTW, this is being installed as part of a complete system upgrade (furnace, heat pump, AC, new stat etc.)

  2. #2
    Join Date
    Oct 2004
    Posts
    3,400
    Maybe I'm missing something here, but I don't think your humidifier will have much effect on the outdoor humidity.

    I would think, even if it has an outdoor sensor, there would still need to be a humidistat indoors.

    Ask your contractor.

  3. #3
    Join Date
    Apr 2004
    Posts
    7,680
    Well the bottom line is that humidity pressure is very strong and you dont want to maintain that 40% RH when its 10 degrees outside. Otherwise moisture will infiltrate, from the inside out and condense IN your walls setting you up for trouble. That said, I still think a return mounted sensor is sufficient as it takes a sample from teh entire space versus just the hallway by the stat.

  4. #4
    Join Date
    Oct 2004
    Posts
    167
    The outside sensor interacts with the indoor controller to lower the humidity as the outdoor temperature goes down. They are nice to have so you dont have to manually control the humidity level based on the outdoor temperature. Some thermostats incorporate humidity control into them and the few I know of do use an outdoor sensor to vary the humidity level based on the outdoor temp.

    I prefer my thermostat with humidity control. Just makes for easier changing and reading of RH (not that I've ever changed the humidity since I've set it up). Also some tstats have reminders on them for pad changing, which should be done yearly.

  5. #5
    Join Date
    Mar 2006
    Posts
    92

    aprilair 700 and carrier LFP

    Are the aprilaire 700 and the carrier LFP the same identical unit?

    Carriers Large Fan Powered (LFP) says has "ideal humidity" for infinity control, does this have different control features... Does the 700 have the same built in feature for the infinity system?

    I believe the 700 is the automatic which takes into consideration outside temp.


  6. #6
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,323

    <50% O.K.

    Originally posted by michael73
    I believe the AprilAire 700 series has an outdoor sensor to control the unit. On the other I've been told stats like some in the WR line can provide the control. The only possible downside I've been told with the outside control is that it's possible to over humidify the house increasing the chance of mold.

    What is everyone's choice here - inside or outside control?

    BTW, this is being installed as part of a complete system upgrade (furnace, heat pump, AC, new stat etc.)
    Change of increasing mold ought to be slim to none.
    Very large margin between comfort level of ~ 40% R.H.
    and >65% R.H. conducive to mold growth.

    Calibrate your R.H. sensor annually and/or
    maintain an independent monitor
    (i.e. hygrometer, sweating windows, knowledge, ... )

    Hygrometer
    http://www.oregoninstruments.com/cat...p?cat=3&scat=4

    AprilAire...
    A remote sensing bulb is a small (about round) sensor that mounts outside the home and connects by light gauge wire (18 to 22 gauge, 2-conductor) to the humidifier controller.

    This sensor provides temperature readings to the computerized controller which allows the humidifier to Automatically ADJUST humidity levels in the home
    based on outside air temperature.

    Double-pane windows will sweat at
    What outside temp versus inside relative humidity?
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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