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  1. #1
    Join Date
    Sep 2002
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    12,195

    Will Copeland and Bohn play nice together ?

    A Copeland EAV1 0200 TAC compressor

    and

    A Bohn (heatcraft) BME260CA evaporator

    Box would probably like to run about -10 F. or so.

    (just off the top of my head) 2 HP running a -20 suction might be 10,000 BTU's?

    And that "260" in the Heatcrsft model number might be 26,000 BTU's?

    But at what suction temperature and TD? <g>

    Anybody know?

    Can I just run maybe a 3 TD instead of say; a 12 TD ? <g>

    PHM
    ------
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  2. #2
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
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    1,244
    Just put an EPR on it. Err, wait a second, you're having the opposite problem on this one.

    I'm just kidding Mikey. I don't have anything useful, I just felt like being a smart a$$.

  3. #3
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
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    1,244
    Just put an EPR on it. Err, wait a second, you're having the opposite problem on this one.

    I'm just kidding Mikey. I don't have anything useful, I just felt like being a smart a$$.

  4. #4
    Join Date
    Sep 2006
    Location
    Chicago
    Posts
    474
    Thats a 26,000 btu running a -20 sst and 10td. If that's the load of your box then running a 3td would require a much larger Evap. I don't see it working.

  5. #5
    Join Date
    Sep 2002
    Posts
    12,195

    So would a CPR work in that case?

    So would a CPR work in that case? Isn't a CPR the opposite of an EPR ?

    PHM
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    Quote Originally Posted by ammoniadog View Post
    Just put an EPR on it. Err, wait a second, you're having the opposite problem on this one.

    I'm just kidding Mikey. I don't have anything useful, I just felt like being a smart a$$.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  6. #6
    Join Date
    Sep 2002
    Posts
    12,195

    No; you have it backwards

    You have it backwards - the box is presently running well with the 0200 Copeland and whatever POS evap is tied to it.

    What I am asking is can I just use the Bohn BME260 with the 0200 compressor? Yes; the suction pressure will obviously run higher but with the heat loading the same won't the TD reduce to compensate?

    PHM
    ------






    Quote Originally Posted by dangpgt97 View Post
    Thats a 26,000 btu running a -20 sst and 10td. If that's the load of your box then running a 3td would require a much larger Evap. I don't see it working.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  7. #7
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,471
    That's what I was always taught - oversized evap = lower td. You are moving the same amount of heat based on the compressor's ability, but over a larger surface... You are also reducing latent capacity, though, and will leave more moisture in the box.

  8. #8
    Join Date
    Sep 2002
    Posts
    12,195

    Hell; the evap drains into a trash can now <g>

    Every time the box goes into defrost all the ice melts, drips into a trash can, and then re-freezes solid. If they forget to empty the trash can all the defrost water runs all over the floor of the box and re-freezes there. I have been there when there has been 4" of ice on the floor.

    The funniest time was when they called because the freezer door was "locked". Turned out to be frozen shut. <g>

    I doubt the 'more or less' humidity issue will trouble them very much. <g>

    PHM
    ------






    Quote Originally Posted by cjpwalker View Post
    That's what I was always taught - oversized evap = lower td. You are moving the same amount of heat based on the compressor's ability, but over a larger surface... You are also reducing latent capacity, though, and will leave more moisture in the box.
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  9. #9
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,471
    HA! I've been there, or at least a distant relative of that place... Drain pan had more silicone than metal, but it didn't matter as it ran to a piece of hose into a bucket (usually over the top of a bucket shaped ice cube onto the floor).

  10. #10
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,264
    Quote Originally Posted by Poodle Head Mikey View Post
    You have it backwards - the box is presently running well with the 0200 Copeland and whatever POS evap is tied to it.

    What I am asking is can I just use the Bohn BME260 with the 0200 compressor? Yes; the suction pressure will obviously run higher but with the heat loading the same won't the TD reduce to compensate?

    PHM
    ------
    The system will balance at the point where their performance curves cross.

    With such a low evap TD, the distributor nozzle would need to be changed. Also I would be concerned about oil logging in the evaporator due to low refrigerant velocity. velocities

  11. #11
    Join Date
    Sep 2006
    Location
    Chicago
    Posts
    474
    Quote Originally Posted by icemeister View Post
    The system will balance at the point where their performance curves cross.

    With such a low evap TD, the distributor nozzle would need to be changed. Also I would be concerned about oil logging in the evaporator due to low refrigerant velocity. velocities
    On top of that will the system be able to supply enough liquid to totally fill the evap? If not what would the additional superheat do to the system performance? If you could flood the evap would the reciever be able to store the additional refrigerant during pump down?

  12. #12
    Join Date
    Sep 2002
    Posts
    12,195

    What I really wanted to know what how far apart the capacities are <g>f

    I won't have access to that data until Monday so I thought I would ask here.

    I understand the curve balancing point - but all those numbers I used above were just guesses. <g>

    Oil logging eh? Let's talk about that -

    This system is 502 - which always seemed to be able to avoid that at moderate temps - say about -40 F and above. Sometimes I used to add a little taste of R-12 if needed but generally didn't find 150 tough to get back until the temps got very low. And then used I pentane.

    How is POE oil to get back out of the cold side? Easier? More difficult?

    I ask because one of my thoughts was to change the compressor oil to POE and to use 404 instead of the present 502. Would that make the potential oil return issue better or worse?

    PHM
    -----






    Quote Originally Posted by icemeister View Post
    The system will balance at the point where their performance curves cross.

    With such a low evap TD, the distributor nozzle would need to be changed. Also I would be concerned about oil logging in the evaporator due to low refrigerant velocity. velocities
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

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