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Tjerlund Side Shot Fan Proving Switch Failures

Mark Wolff
Mark Wolff Member Posts: 256
In the last 6 months we have had three Side Shot installs have bad fan proving switches. The first was right out of the box, had to bypass the switch until a new one could arrive. The second took a month or two to go bad. When it did, one guy went out four times before I went on the call. The reset would be tripped but nothing else was showing wrong. Finally I went out and babysat the thing for 2 hours until the problem duplicated and I could track it to the proving switch on the Side Shot. The third was the same thing, we bypassed the switch and ordered another.

Has anyone else run into this? Is this normal? We never had problems with them before, and it quite honestly is making us reconsider ever installing them again. We can't afford to have boilers down in winter and spending time troubleshooting the system (who checks the powerventer fan proving switch first?)and bypassing until parts can arrive.


  • John Abbott
    John Abbott Member Posts: 356

    Side Shot are you using SS1 or SS2, and do they have the and do they have the new universal printed circuit board with the dip swittches and the leds?

  • Leo
    Leo Member Posts: 770

    The company I work for services both brands. The weak spot on the Fields is the fan/motor I assume being outside causes this. The weak spot on the Tjerland is the fan proving switch I don't know why. We stock one of each proving switch for every brand and model at our office.

  • Mark Hunt
    Mark Hunt Member Posts: 4,909
    So I am NOT the only one!

    We do not usually power-vent equipment, but sometimes it's the best option.

    We had the exact same problem recently with a Jernlund SS-1. Ordered a new board, still waiting to see if the problem goes away.

    Fingers crossed.

    Mark H

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Contractor"
  • Robert O'Connor_4
    Robert O'Connor_4 Member Posts: 88
    Wire them so

    the powerventer gets powered from B1 on the aquastat and then have the primary control powered by the powerventer circuit. This is how I do all my oil installs. Tjerlund shows this in their diagrams .

    If you power the venter from the primary control you will add lots of time to future trouble shooting.


  • Richard D._2
    Richard D._2 Member Posts: 156
    My opinion is

    everyone is going to solid state controlls,and like PC's spikes and brown outs burn out boards!!Thats why we use surge protectors on the PC's..I am trying to find surge protectors for boilers that will be affordable to the H/O or the Co. the contracts the heating unit!! Does anyone know of one that can be wired in the a boiler or furnace???
    Just my thoughts..On what to do about it now??Knock on wood and pray like we do when venters have to be used...Prefer they would not be used..Richard
  • Rudy
    Rudy Member Posts: 482
    surge protectors

    Try useing Intermatics'Panel Guard, Model IG1240RC
    24-Hour Surge Protection mounts at service panel to
    safeguard equipment from in coming power surges.
    It comes with 5 year warranty.
  • John@Reliable_5
    John@Reliable_5 Member Posts: 76
    I have had more...................

    board failures than proving switches go bad. I also wire them using the alt. wiring plan, this way you can brake down quick if it's a vent or burner(control) problem. It's in the back pages of book that comes with unit as Robert said. John@Reliable
This discussion has been closed.