Page 1 of 2 12 LastLast
Results 1 to 13 of 15

Thread: reach in cooler

  1. #1

    Confused reach in cooler

    First post so i will try to give as much information as i can. It is a Traulsen reach in double door cooler it is using R-22. The call i recieved was the unit had frozen the cheese in the cooler. My attempt to adjust the pressure controller did nothing so i replaced the pressure controller. So i turned the machine back on to check my superheat to make sure my charge was correct. Until the unit got down to temp it was running about 40 degrees superheat as soon as it got down to temp it came down to 14 degrees and was running fine. The problem i am having i left my thermometer on the suction line and as soon as the machine would shut off the suction temp line temperature would shoot up and the short cycling of the machine would start till eventually it is not cooling the cooler. By the way this is like my 3 call.

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,681
    What did you set the control at and why? You're 100% sure temp is controlled by pressure and not a thermostat?
    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

  3. #3
    Join Date
    Sep 2011
    Location
    Fayetteville, NC
    Posts
    130
    ditto on what 2 sac said. Look for the wiring diagram. I rarely see a factory box that controls temp with a pressure switch. I have used pressure switches to control the temp in the past and once you set it up you never have issues unless there is a leak.

  4. #4
    Join Date
    Oct 2012
    Location
    Wisconsin
    Posts
    4,145
    I don't remember pressure switches on the r22 traulsens or the newer ones. Did the original control go bad, and someone added the pressure switch after the fact?

  5. #5
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    If original call was frozen product adjusting pressure switch, if used as temp control, down would make that problem worse. Lower pressure setting would equal lower temp. I'm with the other guys. I doubt the pressure switch is intended to control temp. Better take a look at wiring diagram and see what supposed to be going on and go from there.

  6. #6
    Quote Originally Posted by justtrying View Post
    First post so i will try to give as much information as i can. It is a Traulsen reach in double door cooler it is using R-22. The call i recieved was the unit had frozen the cheese in the cooler. My attempt to adjust the pressure controller did nothing so i replaced the pressure controller. So i turned the machine back on to check my superheat to make sure my charge was correct. Until the unit got down to temp it was running about 40 degrees superheat as soon as it got down to temp it came down to 14 degrees and was running fine. The problem i am having i left my thermometer on the suction line and as soon as the machine would shut off the suction temp line temperature would shoot up and the short cycling of the machine would start till eventually it is not cooling the cooler. By the way this is like my 3 call.
    went looking for a wiring diagram and of course there is none to be found i have e-mailed the manufactor to get one. To answer a few questions that i left out when i got there the pressure control spring appeared to be bent from from being twisted in to far. Also i did find a small leak on one of the flare fittings on the TXV so i tightened that up. As for the pressure settings 68 high because i wanted 40 as a make temp and 43 low to give me 20 degrees across the evaporator. why i believe its presssure controlled power goes straight to the pressure controller and out of that to the compressor start windings.

  7. #7
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    The pressure control was probally welded shut from all its short cycling. Buy a cold control!!

  8. #8
    Quote Originally Posted by justtrying View Post
    went looking for a wiring diagram and of course there is none to be found i have e-mailed the manufactor to get one. To answer a few questions that i left out when i got there the pressure control spring appeared to be bent from from being twisted in to far. Also i did find a small leak on one of the flare fittings on the TXV so i tightened that up. As for the pressure settings 68 high because i wanted 40 as a make temp and 43 low to give me 20 degrees across the evaporator. why i believe its presssure controlled power goes straight to the pressure controller and out of that to the compressor start windings.
    thanks

  9. #9
    Join Date
    Oct 2012
    Location
    Wisconsin
    Posts
    4,145
    Quote Originally Posted by KB Cool View Post
    The pressure control was probally welded shut from all its short cycling. Buy a cold control!!
    I would definately agree. A cold control would work a lot better.

  10. #10
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    464
    I have a lot of old McCall pizza retarders and older pizza make tables using a Ranco low pressure switch for temp control. I've gotten good at setting them up and they work great. Mostly R414B, R409A or R134. The newer R404 units use the Ranco ETC 111-000. I set the Cut IN at about 36F--38F with a 18F dif works well in my equipment. Maybe a little on the cold side but I'd rather have a cold complaint rather than an above 40F call.

  11. #11
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,227
    Quote Originally Posted by justtrying View Post
    The problem i am having i left my thermometer on the suction line and as soon as the machine would shut off the suction temp line temperature would shoot up and the short cycling of the machine would start
    the only thing i can think of , is a cracked valve in the compressor allowing high side to leak into low side ...

  12. #12
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,681
    Quote Originally Posted by Snapperhead View Post
    the only thing i can think of , is a cracked valve in the compressor allowing high side to leak into low side ...
    Makes sense
    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

  13. #13
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,893
    Quote Originally Posted by 2sac View Post
    Makes sense
    Yeah, but it's freezing the cheese!!!!

Page 1 of 2 12 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
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event