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  1. #1
    Join Date
    Nov 2010
    Location
    MN
    Posts
    143

    Constant cut-in T-stat

    What's the difference between between the coiled and pigtailed ones. Had a Delfield reachin cooler with cold rail on top, the TXV fed evap underneath had a bad pigtailed T-stat, replaced it with a coiled captube styled one. Not sure if each has a specific application that I'm not aware of. Thanks in advance for any info.

  2. #2
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,473
    Not sure what you mean by pigtailed. The coiled cap tube just gives you kind of a poor-man's sensing bulb allowing more of the cap tube to be in contact with the coil. The main thing to watch for is temp range and cut-in temp, and to make sure the sensing portion is mounted the same way as factory (in the coil, in a well, in the air stream, etc.)

  3. #3
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,510
    The Delfield reach ins are real touchy. We have had best luck using OEM stats and they must be inserted in the same place in the coil.
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  4. #4
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    645
    You can wrap the capillary of the A12-700 around a screwdriver and make it look like a pigtail just like a Delfield one, by the way! I also stick with Delfield t-stats for Delfield units. But I have seen A12-700's used successfully (by others) on Delfields, too. Whether the capillary is in a pigtail or not doesn't really matter. If you use a straight one that is not pigtailed (which I think you are calling a "coiled" capillary, since they are coiled up?) Just be sure to fold it up a few times if necessary, to get at least 6" contacting the coil. I've always figured more is better, so I usually fold it until I have several feet of capillary folded up stuck into the coil.

    *edit* as already posted, the important thing is to get the same temperature range. Delfield (If I recall correctly) t-stats use a 37*f cut-in and 20* cut out (at mid point setting).

  5. #5
    Join Date
    Dec 2007
    Location
    Chandler AZ
    Posts
    168
    A12-701 will work . That's all I use on reach-in coolers .

  6. #6
    A12-701 is all i use also. constant cut in of 41. stick it in the evap coil. range of 15 to 31 i think

  7. #7
    Join Date
    Feb 2008
    Posts
    96
    In my opinion, Delfield reach ins have air flow issues. Therefore, you must use a constant cut in stat and never an air temperature thermostat, even a digital one. If you do, the evaps will freeze up

  8. #8
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Quote Originally Posted by QTEMP View Post
    In my opinion, Delfield reach ins have air flow issues. Therefore, you must use a constant cut in stat and never an air temperature thermostat, even a digital one. If you do, the evaps will freeze up
    Most definitely. My old boss, the hack he is used an A30-261 .. would turn the dial all the way to the right and back a hair. Talk about iced over coils

    Like crazy eye and vanilla I too only use A12-701 except in beer boxes where I like to keep the cut in lower where I use a 700.

    Sent from my SGH-T999 using Tapatalk 2

  9. #9
    Join Date
    Nov 2010
    Location
    MN
    Posts
    143
    Thanks for all the info guys.

  10. #10
    Join Date
    Dec 2011
    Location
    Western Kentucky
    Posts
    44
    Good info. Will be keeping a 700 and 701 on my truck all times now..

  11. #11
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,744
    As I remember, the pigtails are to be inserted inside the coil so all the coil temp can be sensed. Constant cut-ins are typically set at 38 degrees or so and that makes the inside of the evap ice free.

    Mounting the sensor on the face of the evap does in insure that the evap is ice free except for the face of the evap. Ice could still be built up on the inside rows of the evap..and typically is.
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