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  1. #14
    Join Date
    Jun 2011
    Location
    Western MA
    Posts
    58
    Yes interlock to "G" for continuous fan. And yes, you primarily need during heating and cooling seasons when house is all closed up.

  2. #15
    Join Date
    Nov 2001
    Location
    East Texas
    Posts
    897
    Quote Originally Posted by Josephs LLC View Post
    Yes interlock to "G" for continuous fan. And yes, you primarily need during heating and cooling seasons when house is all closed up.
    do you mean to leave the Fan on the ON position on T stat, thus making air handler and erv to run continously ?

    I was planning on leaving the Fan on the AUTO position and letting the air handler and erv cycle together whenever there is a call for Heat or Cool.

  3. #16
    Join Date
    Nov 2001
    Location
    East Texas
    Posts
    897
    Question

    Say its 95 outside and 75 inside. 50% RH outside.

    What temp. would the incoming fresh air be ?

  4. #17
    Join Date
    Jun 2011
    Location
    Western MA
    Posts
    58
    If you have a erv central controller or a tstat that controls the erv you can control how you want the unit to run. If it is hot and humid out and cool and dry inside the heat will transfer from the incoming air to the out going air. If its 95 outside and 75 inside you'll prob get 80 degree incoming air. I'd suggest downloading the installation manual and reading it end to end. You really need to understand how it works so you dont sound foolish discussing the entire system with the owners when you are done.

  5. #18
    Join Date
    Jul 2008
    Location
    Prairie du Sac, WI
    Posts
    22

    Any ERV experts here

    The ERV should run independently of the air handler/A/C, otherwise the amount of ventilation would be determined by how hot or cold it is outdoors.
    A desired ventilation rate can be accomplished by the manufacturer's timer control or a thermostat ventilation setting.
    The vents should not be routed to the roof, otherwise hot air radiating off the roof and shingle offgassing would be brought inside through the intake.
    Most ERVs will have some type of filter, but only the air handler/A/C filter will address air already inside the house as well as fresh air being brought in.
    A misconception is that ERVs mix stale air with fresh air to transfer heat or cooling energy. In better ERVs, there is nearly a complete air stream separation. Sensible (heat) transfer generally takes place by conduction, while moisture is transferred by various means.
    HVI (Home Ventilating Institute) provides the only independent rating for ERVs, which can range from @ 55-85% Apparent Sensible Effectiveness (HVI term). Latent (moisture) transfer varies from @ 30-60%.

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