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  1. #1
    Join Date
    Aug 2012
    Posts
    7

    New Evaporator and condenser installed . R-22

    Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric

  2. #2
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    673
    Quote Originally Posted by 808jib View Post
    Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric
    Yes. Has nothing to do with R22. It is normal for anything below 32*f to frost.

  3. #3
    Join Date
    May 2008
    Location
    Myrtle Creek. Oregon
    Posts
    182
    Put a defrost clock on it!
    a stupid question is a question you wont to ask, but don't

  4. #4
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Check the box for infiltration. Warm moist air will suck into the box through any opening and freeze on the coil. Check door gaskets and penetrations for line sets and electrical. Also check door closure and latch that they close and hold door sealed. Usually don't need defrost on coolers however if your box is beat up and full of gaps it may be the most cost effective solution as long as it makes set point. Oh ya and tell them not to prop door open.

  5. #5
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,444
    Quote Originally Posted by 808jib View Post
    Hi guys. I just change out a evaporator and a condenser for a w/in ref. I notice the txv outlet is frosting where the spider going to coil. I running R-22 and my pressure is 50psi suction and 260 high side. Site glass is clear and temperature is 40- 38 F. It was running good for a week and the evaporator ice up. I deice coil and everything looks ok except frosting coming out the txv. Is this normal for r-22 ? Thanks Eric
    Could be low air flow through the cooling coil. This basic. Increase the air flow through the coil.
    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"

  6. #6
    Join Date
    Jun 2010
    Location
    Miami
    Posts
    258
    Wouldn't hurt to check evap superheat. Might need to open up the txv a bit.

  7. #7
    Join Date
    Aug 2012
    Posts
    7
    I notice some r-22 meduim temp system some sweat coming out the txv and some frost. I know r-12 doesnt frost.

  8. #8
    Join Date
    Aug 2012
    Posts
    7
    Quote Originally Posted by cboe View Post
    Put a defrost clock on it!
    Usually Meduim temp does not require defrost timer since temperature is above 32F.

  9. #9
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,626
    Quote Originally Posted by 808jib View Post
    Usually Meduim temp does not require defrost timer since temperature is above 32F.
    In a perfect world.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  10. #10
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    Quote Originally Posted by 808jib View Post
    I notice some r-22 meduim temp system some sweat coming out the txv and some frost. I know r-12 doesnt frost.
    Can you explain more about this phenomenon?

  11. #11
    Join Date
    Aug 2012
    Location
    Georgia
    Posts
    27
    Quote Originally Posted by 2sac View Post
    In a perfect world.
    I agree. I service 2 walk in coolers and 2 walk in freezers. Two run r12 and two r22. All have defrost timers. If the cooler was installed charged and left alone it probably would be fine. As soon as you add people into the mix it is over. They can't seem to close the doors! Not to mention plastic and all sorts of other trash that gets on the coil.

  12. #12
    Join Date
    Aug 2012
    Posts
    7
    How many defrost time you put per day and how long ?

  13. #13
    Join Date
    Jul 2010
    Location
    So-Cal
    Posts
    580
    I usually put it for 15min 3 times during the day and 30-35 min about 2:00am.

    I work for a fast food company that is not open 24hrs they leave around mid night so the 30-35min at that time is ok because no one is opening the door.
    Never iced up again.

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