Results 1 to 7 of 7
  1. #1
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381

    fcc & headmaster ?

    why would a 1 fan cond unit have both ? ... seen it recently & I couldn't quite put my finger on it ... system had no issues but while passing time on a dif unit I happen to gaze over & notice

  2. #2
    Join Date
    Sep 2006
    Location
    Chicago
    Posts
    474
    Sounds like a bad idea to me. There was some talk on here awhile back about manufacturers cycling one of two fans along with a headmaster to reduce refrigerant charge and gain some energy efficiency the months you don't need to be running it.

    I've seen this setup a couple of times with a single fan using both a fcc and headmaster. There's just too much of a head pressure swing too quick. The two controls fight eachother. When I see this it tells me there's something wrong with the installation or there was a problem with the unit when it was new. Unless it was intentional by the manufacturer.

    Any system with the properly sized reciever should work great with a condenser flooding device alone.

  3. #3
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    thanks for reply ... all 5 units were set up the same, the 6th which was the only non original compressor didn't have the fcc ... guess that tech figured it wasn't necessary considering .

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,575

  5. #5
    Join Date
    Mar 2011
    Location
    Northeast Missouri
    Posts
    61
    I see that alot in my neck of the woods too. I do not know the reason myself why other techs do this. My best guess is they do not understand how a refrigeration system works and this was their best guess at a repair..? When I find a system like this I always explain it to the customer and make the appropriate repairs.

  6. #6
    So now I've run across this. The units were Trenton with factory Headmasters at 215# and fan cycling control set at 100# cut out and 180# cut in, R-404a. Comps are air cooled. They've been like this for a while, I assume.
    I want to raise the CFM to cut out at 10# above the Headmaster, like I've done for other units that had multiple fans. Except, what about the comp? The other units I've done were either gas cooled so it did not matter or had 2 or more CFM's and the one by the comp ran 100%.

  7. #7
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,164
    Back in the day ... I added a fcc to a walkin unit before i knew the facts. Now i look back i think i should have replaced the headmaster



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