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Thread: HRV question

  1. #1
    Join Date
    Aug 2011
    Posts
    6

    HRV question

    My 20 year old ranch home had a direct vent 90% furnace and a lifebreath HVR as an initial install.After a few years the HRV stopped draining any water from the house and I had to install a humidifier to get some humidity in house during the winter. House is pretty tight(above average according to energy audit's door fan test)

    Just had a new Trane xv95 furnace installed and they balanced the HRV, the outside temps are around 70 right now with high humidity and still nothing from the HRV. The intake and exhaust vents are strong draws and exhaust but there seems to be very little draws from the return registers for the HRV from bathrooms and laundry room.

    Anyway the fan on the HRV is a bit noisey so after 20 years I'm thinking of replacing the unit or just not using one at all. Could the core just is not passing enough air through?

    Unfortunately not a lot of experts around here to help. Appreciate any from you guys.

  2. #2
    Join Date
    Dec 2006
    Location
    toronto, canada
    Posts
    551
    Just confused. HRV makes your house dry in winter and Humidifier makes your house wet. HRV is only used in winter not in summer. The drain is for winter condensation, not for summer dehumidification. If somebody balanced the HRV, and you feel the draw at return is weak, Maybe just your feeling is wrong.

  3. #3
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,646
    During the winter, the stack effect and wind forces a home to breathe much more than during the summer.
    There is more need for fresh air ventilation during the summer than during the winter when the windows are closed for a/c.
    Well ventilated homes with only a couple of occupants may need some humidification during winter in cold climates. All well ventilated homes in green grass climates need dehumidification during low/no cooling load conditions with +55^F outdoor dew points.
    HRVs transfer heat from warm to cold air streams. Expect condensate only during extreme cold weather with a well humidified home. No condensate during the warm seasons. Fresh air ventilation whenever the windows are closed.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  4. #4
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,440
    ERV is needed if you elect to have this equipment for fresh air make-up.

    HRV does not handle Humidity.

    http://www.advancedenergy.org/buildi...lation/erv.pdf
    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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