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  1. #1
    Join Date
    Apr 2010
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    Ontario
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    Is this normal. Ori and Cond. fan cycling

    Ori and condenser fan cycling on the 2nd fan of a two fan condensing unit.
    Keeprite M/n KH200H2-HT3#-1931.
    Wouldn't the ORI valve be enough?
    ENJOY THE RIDE

  2. #2
    Join Date
    Sep 2008
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    Western PA
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    25,670
    Quote Originally Posted by Peztoy
    Ori and condenser fan cycling on the 2nd fan of a two fan condensing unit.
    Keeprite M/n KH200H2-HT3#-1931.
    Wouldn't the ORI valve be enough?
    Yes, the ORI is enough, but many manufacturers cycle the second fan, too.

    Saves a bit if energy.

  3. #3
    Join Date
    Feb 2006
    Location
    USA
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    4,381
    I've seen it & even asked the same question once upon a time. here's the link
    http://hvac-talk.com/vbb/showthread....ght=headmaster

    Sent from my HTC Sensation 4G using Tapatalk

  4. #4
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    Apr 2010
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    Ontario
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    474
    Thanks guys. I'll leave well enough alone.
    ENJOY THE RIDE

  5. #5
    Join Date
    May 2011
    Location
    Chas.,WV
    Posts
    30
    By cycling the second fan you also reduce the amount of refrigerant required for low ambient operation.

  6. #6
    Join Date
    Sep 2008
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    Quote Originally Posted by Ben Wulkin
    By cycling the second fan you also reduce the amount of refrigerant required for low ambient operation.
    I doubt it

  7. #7
    Join Date
    Jan 2012
    Location
    ohio
    Posts
    141
    what is an ori valve ?

  8. #8
    Join Date
    Jan 2007
    Location
    Stongsville Oh
    Posts
    899
    Sporan Open on Rise at Inlet. Used in low ambient head pressure control headhttp://www.legacychillers.com/cms_data/uploads/Sporlan-90-30-floodedvalve.pdfhttp://http://www.legacychillers.com...oodedvalve.pdf pressure control.
    ckartson
    I didn't write the book I just read it!

  9. #9
    Join Date
    Feb 2006
    Location
    USA
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    4,381
    Quote Originally Posted by royd2 View Post
    what is an ori valve ?
    Open on Rise of Inlet(ORI) ..


    Sent from my HTC Sensation 4G using Tapatalk

  10. #10
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  11. #11
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,582
    Many times the ORI has vever been set here. In Ct many stores have 100% fan cycling, but when the temperature drops even with all the fans off the ORI is needed to maintain minimum head pressures for the TXV's to feed. I have seen a rack stall when the head is lower than the Low side cut in setpoint with the ORI open all the way.
    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  12. #12
    Join Date
    Sep 2008
    Location
    Western PA
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    25,670
    Quote Originally Posted by Freezeking2000
    Many times the ORI has vever been set here. In Ct many stores have 100% fan cycling, but when the temperature drops even with all the fans off the ORI is needed to maintain minimum head pressures for the TXV's to feed. I have seen a rack stall when the head is lower than the Low side cut in setpoint with the ORI open all the way.
    Yep. I've seen that, too.


    Had a neat one not long ago with a case that couldn't keep temp.


    The ORI was set too low and I wasn't getting enough pressure drop across the TEV.

    Raised the ORI to an appropriate level and it took off and ran.

  13. #13
    Join Date
    Apr 2010
    Location
    Ontario
    Posts
    474
    When you say "a rack stalled". Does this refer to when the ori is holding back the refrigerant in the condenser and permitting very little to no refrigerant in the liquid line?
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