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  1. #1
    Join Date
    Feb 2006
    Location
    indiana
    Posts
    77

    charging 404a system

    when charging a walk in freezer, is it ok to charge to a full sight glass. there isnt a receiver. 404a.

  2. #2
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    499
    If the SC looks good and the glass is still flashing, stop charging. You are more concerned with the SC than the sight glass.

  3. #3
    Join Date
    Nov 2011
    Location
    North sweden, Umeε, Where the birches growing without limits.
    Posts
    98
    I've been told by my more learned colleauges that a system with txv and no reciever is pretty sensitive to charge. If it's not in right temp area. Charge'til it almost no flash. When close in themp it will stop flash and become clean sight glass. This is what i've performed on a pair of coolmax freezer units w/no reciever. Success every time. Ah... Subcool... let it be 'bout 5-6degF

  4. #4
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,833
    I dont use site glass for anything!

  5. #5
    Join Date
    Oct 2004
    Location
    Maryland
    Posts
    45
    No receiver, that could be a problem when it satisfies and pumps down. It does pump down, right?

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,965
    Quote Originally Posted by bigger b View Post
    No receiver, that could be a problem when it satisfies and pumps down. It does pump down, right?
    That would depend on a number of factors.

    Length of the liquid line being pumped down would be the biggest.

  7. #7
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Walk in freezer with no receiver? Flashing sight glass is OK? Umm no!! TXV must have full colum of liquid. You cannot adjust TXV to proper superheat with out a full colum of liquid feeding it. It will hunt and never stabilize. Are you sure there is not a receiver?

  8. #8
    Join Date
    Dec 2012
    Posts
    6
    reason number 1 why manufacturers are getting rifd of sight glasses, people rely on them. weed out the non-professionals

  9. #9
    Join Date
    Dec 2012
    Posts
    6
    at least thats what all of the trade-show guys keep preaching to us and it seems to make sense.

  10. #10
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by rmitch78 View Post
    reason number 1 why manufacturers are getting rifd of sight glasses, people rely on them. weed out the non-professionals
    I disagree with that statement. So if you mis-interpret your meter, you should not use it anymore? Sight glasses have their place and their purpose and refrigeration work is where you'll see them the most.

  11. #11
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,965
    Quote Originally Posted by rmitch78 View Post
    reason number 1 why manufacturers are getting rifd of sight glasses, people rely on them. weed out the non-professionals
    Very bold statement to be making.

    Got proof?

  12. #12
    Join Date
    Dec 2012
    Posts
    6
    well, companies that use sporlan and danfoss told us that's why manufacturers are *trying* to do away with them on their systems. maybe not weed out the suckers like i mis-spoke, but to try to differ people from relying on them i should have said.

  13. #13
    Join Date
    Dec 2012
    Posts
    6
    to quote national: "Do not replenish refrigerant solely because of bubbles in the sight glass. First find out the cause of the bubbles!" I'm thinking fractionization has an additional effect.

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