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  1. #1
    Join Date
    Mar 2006
    Posts
    1,028

    Wiring Help, Steam table

    I have a table, with 2 submersed 208v elec. heaters. One shorted and took out a whole mess of equipment with it. What im looking for is a sample wiring diagram or just some point in the right direction. all the existing wiring is burnt and untraceable so ill be starting from scratch. The Temp probe and the Hi/Low/Common water sensor bullets are still good

    Watlow LV controller http://www.watlow.com/downloads/en/s...inbltc0208.pdf

    Liquid Level Board
    http://new.ametek.com/content-manage...S210-NS211.pdf

    2 208v Elements
    The tank has a wall fill solenoid that was undamaged.
    Although the boards say they could handle to heaters id rather bring them on via a relay or contactor.

    any help would be much appreciated

  2. #2
    Join Date
    Oct 2010
    Posts
    47
    You will want to start out with the schematic for the Liquid Level Board . That will give you the wiring for your fill solenoid, low water light if you have one and pass the control circuit voltage via the heat terminal to your controller. Remember this is a control circuit so it won't be able to carry a load for your element. You will need to bring in the appropriate voltage to your contactor input with your elements connected to the output and have your Watlow Controller control the coil energizing of the contactor.

  3. #3
    Join Date
    Jan 2008
    Location
    Lake Worth, FL
    Posts
    111
    Do you have a brand and model #

  4. #4
    Join Date
    May 2004
    Posts
    11,995
    Sounds like the old Taco Bell Steam Lines with the liquid board and 120v water fill valve added as a replacement to the toilet bowl level valves.

    Liquid board makes and breaks the control voltage to the contractors feeding 1 ph/5000 or 8000 kw butterfly elements. Hi limits kills one leg of the butterfly high voltage. The stats also make and break the same control wire that feeds the common and n.o. contacts on the liquid board.

    The board has a low water and high water probe. Water shuts off when the board see water continuity to the high water probe then turns the water on when the low water looses continuity to the water.

  5. #5
    Join Date
    May 2004
    Posts
    11,995

  6. #6
    Join Date
    Mar 2006
    Posts
    1,028
    wired up the liquid board the other day, then found the solenoids were opening but no water.. why, well the water supply was shut off, why well i found out this morning when they called and said it was leaking, so i have to go back fix the plumbing and wired up the temp controller. This is what im thinking

    Heater terminal on the liquid board, goes to the common side on the Temp Controller
    N.O. side of the relay on the Temp Controller to one side of the 208v coil contactor
    other side of the 208v coil to the systems L2

    Is this correct. The manual for the Watlow Temp Controller says

    "'Switching inductive loads (relay coils, solenoids, etc.) with the mechanical relay, switched dc or solid-state relay output options requires using an R.C. suppressor. Watlow carries the R.C suppressor Quencharc brand name, which is a trademark of ITW Pakron. Watlow Part No. 0804-0147-0000.'"

    what does this mean ? and whats a R.C. suppressor.. never heard of one, nor my boss

  7. #7
    Join Date
    Mar 2006
    Posts
    1,028
    wired up temp controller works great now, the managers are thrilled cause it never worked, but they are filling it up manually untill i can fix the leak, its from the checkvalve installed in the fill line

  8. #8
    Join Date
    May 2004
    Posts
    11,995

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