Results 1 to 11 of 11
  1. #1
    Join Date
    Oct 2005
    Posts
    14
    Hi all. I am working at a site that has a unit made my DWM Copeland. There is not to much information for this new install.

    What I found out so far is that the nameplate says it takes R407C, And 40Kg of it.

    It looks like this unit came from europe?

    Best way to check for leaks? Vaccuum?

    What is the avalibility of R407C?


    Thanks.....

  2. #2
    Join Date
    Jul 2000
    Location
    Dallas,Texas
    Posts
    4,954
    United Refrigeration carries it in my area. Priced about like 410.

    I have some process chillers out of Japan with 407c now.

    ....gauges in bars and pascals too.

    It's a brave new world.

  3. #3
    If it's a new install and already leaking, why not call the contractor back?

  4. #4
    Join Date
    Oct 2005
    Posts
    14
    I don't know if it has any leaks yet.

    It looks like they want me to perssurize it with nitrogen to 4bar and check for leaks.

    In the automotive field we pulled a vacuum and see if it held for around one hour or longer (overnight) if you had the time.

    This unit was made in europe for there is not to much information on it.

    Thanks for the replies.

  5. #5
    Join Date
    Sep 2006
    Posts
    31
    DWM Copeland are made from Europe

    You may pressurize the system with Nitrogen.

    Evacuate the system down to 0.3 mbar

    R407C are available as an HFC alternative to R22







    [Edited by cesarcolomaiii on 09-07-2006 at 08:52 AM]

  6. #6
    Join Date
    Sep 2004
    Location
    Newbury Berkshire
    Posts
    490
    Originally posted by coolinnj
    I don't know if it has any leaks yet.

    It looks like they want me to perssurize it with nitrogen to 4bar and check for leaks.

    In the automotive field we pulled a vacuum and see if it held for around one hour or longer (overnight) if you had the time.

    This unit was made in europe for there is not to much information on it.

    Thanks for the replies.
    4 bar- what's that gonna prove -the suction runs higher than that

    Cheers

    Richard

  7. #7
    Join Date
    Sep 2006
    Posts
    31
    Originally posted by barty
    Originally posted by coolinnj
    I don't know if it has any leaks yet.

    It looks like they want me to perssurize it with nitrogen to 4bar and check for leaks.

    In the automotive field we pulled a vacuum and see if it held for around one hour or longer (overnight) if you had the time.
    This unit was made in europe for there is not to much information on it.
    Thanks for the replies.
    4 bar- what's that gonna prove -the suction runs higher than that

    Cheers
    Richard
    its about 59 psig and suction pressure can reach as high as that. whats the model #?

    [Edited by The Saint on 09-11-2006 at 04:36 AM]

  8. #8
    Join Date
    Sep 2006
    Location
    ireland dublin
    Posts
    6

    Post DWV COPELAND WITH R407C

    OPERATES AT 4BAR TO 4 AND A QUATER BACK PRESSURE /HEAD OF 17 TO 25 BAR DEPENDS ON LOAD .PRESSURE TEST TO OPERATING PRESSURES TO CONFIRM LEAKS. BY THE WAY MAKE SURE YOU LIQUIDE CHARGE AS R407C HAS 3 DIFFERENT GASES TO MAKE ONE.KNOWN AS R407C

  9. #9
    Join Date
    Mar 2006
    Location
    plattsburgh ny
    Posts
    6

    retrofit from 22 to 407

    Good morn techs!!I have a New Data Aire split.It came in pinched and brazed from the factory?It was in stalled by pipe fitters.Name plate says r-22,but the gov. wants all systems changed and they want 407..It has a cop-scroll 1.5 ton compressor..The sight glass has already started turning so we know what I got to do there,flush system nitro,chg dryer, chk no leaks,pull vac..My major concern is after reading around is the oil change..I will have to cut out the scroll and dump the oil,but will i get enough oil out.I have not used this 407 yet but the place im working is expecting another 20-30 of the same NDA systems.I would like to get it right the first time.Tryin to get the manuf but they seem to be busy all the time..

  10. #10
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584

    Thumbs down R407c-The C-hina



    Just another import from our allies in China.

    Feature:
    1) Pressure is close to HCFC-22, therefore comparatively large design changes are no needed.
    2) Theoretical COP of 97% compared to HCFC-22 (system COP test sample of optimized system = 99%)
    3) Zeotropic, need liquid charging etc. Therefore special handling precautions needed
    4) composition: HFC-32, 125 and 134a
    5) Applications: Air-conditioning systems, room air-conditioning and refrigeration equipment for food storage.

    Property of chloride
    1) Molecular weight: 86.2
    2) Boiling Point: -43.6C
    3) Critical temperature: 85.62C
    4) Critical pressure: 4.613MPa
    5) Density of saturated liquid: 1.136g/m?
    6) Specific heat of liquid: 1.554kJ/kg. K
    7) ODP: 0
    8) Vaporization heat under BP: 250.3kJ/kg

    Quality standards:
    1) Purity: 99.9%
    2) Moisture: 15 Max massppm
    3) Acidity: 1 Max massppm
    4) Residue on evaporation: 15 Max massppm
    5) Feature: Colorless, no cloudy, no smell.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  11. #11
    Join Date
    Mar 2006
    Location
    plattsburgh ny
    Posts
    6

    Thumbs up DWM Copeland with 407c

    Thanks for the info Aircooled53..I have also found out that the cope-scroll has already got poe oil,so the change over should not be so bad.Thanks again for the specs...

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