Page 6 of 7 FirstFirst 1234567 LastLast
Results 66 to 78 of 83
  1. #66
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,284
    Post Likes
    Quote Originally Posted by tvpbnl View Post
    Yes, POE is very hydroscopic. On this job the unit was open to the atmosphere. New dryers are installed. To minimize the POE coming in contact with moisture, evacuate your system after leak checking. Since we have a measured amount of oil you can break the vacuum by drawing out the oil before adding the new refrigerant.
    If you suspect contaminated oil (Haven't run across that a whole hell of a lot) change it before pulling a vacuum. Why open the system after!

  2. #67
    Join Date
    Jul 2012
    Posts
    2,372
    Post Likes
    I do oil changes before the evac. Oils do mix. Dont believe the hype.

  3. #68
    Join Date
    Feb 2017
    Location
    New York
    Posts
    1,661
    Post Likes
    Quote Originally Posted by captaincompressor View Post
    I do oil changes before the evac. Oils do mix. Dont believe the hype.
    Same here, I always pull on fresh oil! I do a bit of chiller work. Even with mineral oil, you should see how much comes out of it when the vacuum gets deep through the sight glass.

    Sent from my SM-G935U using Tapatalk
    -----Stop, step back, relax and have another go at it.-----

  4. #69
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,284
    Post Likes
    Quote Originally Posted by BennyD View Post
    Same here, I always pull on fresh oil! I do a bit of chiller work. Even with mineral oil, you should see how much comes out of it when the vacuum gets deep through the sight glass.

    Sent from my SM-G935U using Tapatalk
    Chillers are a completely different story!

  5. #70
    Join Date
    Feb 2017
    Location
    New York
    Posts
    1,661
    Post Likes
    Quote Originally Posted by pecmsg View Post
    Chillers are a completely different story!
    I know, just making a reference that even if the oil is fresh out of a container, there still may be some crap in it.

    Sent from my SM-G935U using Tapatalk
    -----Stop, step back, relax and have another go at it.-----

  6. #71
    Join Date
    May 2019
    Location
    Trinity Florida
    Posts
    20
    Post Likes
    I recently replaced the R-22 on a 10 ton de-humidification unit with R-422b (NU-22). I did remove the mineral oil from both Copleweld 5 ton compressors, replaced with POE. I felt the NU-22 could handle the residual mineral oil throughout the system. The pressures were very similar to R-22.
    The NU-22 has a 10 degree glide. I followed the dew TP chart and with my digital gauges, I was seeing a very high superheat on both system (24 degrees) with a clear sight glass. The system had Sporlan SVE-4-CP100 (4 ton) valves. I ran the adjustment stem all the way out and could get no lower. When I checked with Sporlan they said that R-422b would require SVE-8-CP100 (8 ton)valves to maintain proper refrigerant flow to the evap. I guess if you have a piston expansion device it could be changed out. If you have cap tubes your screwed.
    I did change out the Schrader valve cores and service caps.

  7. #72
    Join Date
    Jan 2010
    Posts
    18,692
    Post Likes
    Quote Originally Posted by tvpbnl View Post
    I recently replaced the R-22 on a 10 ton de-humidification unit with R-422b (NU-22). I did remove the mineral oil from both Copleweld 5 ton compressors, replaced with POE. I felt the NU-22 could handle the residual mineral oil throughout the system. The pressures were very similar to R-22.
    The NU-22 has a 10 degree glide. I followed the dew TP chart and with my digital gauges, I was seeing a very high superheat on both system (24 degrees) with a clear sight glass. The system had Sporlan SVE-4-CP100 (4 ton) valves. I ran the adjustment stem all the way out and could get no lower. When I checked with Sporlan they said that R-422b would require SVE-8-CP100 (8 ton)valves to maintain proper refrigerant flow to the evap. I guess if you have a piston expansion device it could be changed out. If you have cap tubes your screwed.
    I did change out the Schrader valve cores and service caps.
    So what's your next course of action ?

  8. #73
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,284
    Post Likes
    Quote Originally Posted by tvpbnl View Post
    I recently replaced the R-22 on a 10 ton de-humidification unit with R-422b (NU-22). I did remove the mineral oil from both Copleweld 5 ton compressors, replaced with POE. I felt the NU-22 could handle the residual mineral oil throughout the system. The pressures were very similar to R-22.
    The NU-22 has a 10 degree glide. I followed the dew TP chart and with my digital gauges, I was seeing a very high superheat on both system (24 degrees) with a clear sight glass. The system had Sporlan SVE-4-CP100 (4 ton) valves. I ran the adjustment stem all the way out and could get no lower. When I checked with Sporlan they said that R-422b would require SVE-8-CP100 (8 ton)valves to maintain proper refrigerant flow to the evap. I guess if you have a piston expansion device it could be changed out. If you have cap tubes your screwed.
    I did change out the Schrader valve cores and service caps.
    Please post where it says double the valve size!

    I call BS

  9. #74
    Join Date
    May 2019
    Location
    Trinity Florida
    Posts
    20
    Post Likes

    Need bigger expansion valves with R-422b retrofit

    I got this directly from Parker/Sporlan:

    Tom,
    Thank you for the clarification. For R-422B with evaporator temperature of 40 F, condensing temp of 110 F, liquid temp 90 F, and a refrigerant distributor the valve should be the
    SVE-8-GA or ERVE-8-GA
    Or if you prefer the CP100 charge, then use SVD-8-CP100 or ERVE-8-CP100.

    The SVE-4 would be undersized for this application.

    See below for results of Virtual Engineer Selection program. This program can be found at
    http://solutions.parker.com/sporlanvirtualengineer
    Thank you

  10. #75
    Join Date
    Sep 2003
    Location
    Ocean County, N.J.
    Posts
    639
    Post Likes
    United supply, months back, didn't even sell r 22, only nu22.

  11. #76
    Join Date
    May 2019
    Location
    Trinity Florida
    Posts
    20
    Post Likes
    Quote Originally Posted by VTP99 View Post
    So what's your next course of action ?
    We are going to changed out the expansion valves.

  12. #77
    Join Date
    May 2004
    Location
    California
    Posts
    793
    Post Likes
    I've done a few retro fits.
    But it's not my go to solution.
    I've installed r407 condensers
    Not my go to solution.
    My go-to solution is install a new R410 evaporator and condenser.
    It even comes with a manufacturer warranty.

  13. #78
    Join Date
    Jun 2013
    Posts
    53
    Post Likes
    R427a when mineral oil
    R407c Poe oil
    Make it simple and label it


    Sent from my iPhone using Tapatalk

Page 6 of 7 FirstFirst 1234567 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •