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    Recuperator is not working

    Hello, I have got a recuperator that is not working, the problem is in the pcb but I can not really determine in which part exactly.
    I have an exact second one and these are the differences I found:

    1.
    Bad PCB's:
    2 Triacs BTS136 read 0.245 across the diode junctions.
    Good PCB's triacs read 0.588.
    I did measure in circuit
    The JST16A triac reads the same in both pcbs.

    2.
    Resistor which I marked as R1
    Bad PCB's - 1.4kOhm
    Good PCB's - 4.5kOhm
    Could it have fried something because of that and how did the resistance drop so much?

    3.RED,Yellow,Green,Blue LED's
    Non of them are working using multimeter, on the other hand on the good PCB they are fine.

    4.
    Where I marked SH1 I assume these are the shottky diodes not really sure, but,
    In the good PCB forward voltage drop in all of them - 0.7
    backwards 2.7 and fluxuattng because of other components I suppose.

    On the bad PCB forward drop is around 0.6-0.7 across them.
    What is interesting that on the SH1 backwards connection of multimeter also shows 0.7 constant.

    The 10 amp fuse is fine.

    One final note - I measured everything in circuit, have not remove the components yet.

    Would really appreciate if someone could give me some insights what could the problem be or just give me some hints of what is potentially wrong.
    The recuperator was working fine and stopped, don't really have an idea what happened but if by any chance water shorted the terminals, not on the PCB but the ones that go to the motor, what is the most probable component to blow.

    Best Regards, Rokas
    Attached Files

    #2
    Re: Recuperator is not working

    Sorry SH1 is a zenner diode

    Comment


      #3
      Re: Recuperator is not working

      so, what is this for?
      i see a high voltage generator and a full 2way infrared link and a temperature/humidity sensor?

      Comment


        #4
        Re: Recuperator is not working

        there is a broken solder joint near the 4way screw terminal block - it's a large resistor

        Comment


          #5
          Re: Recuperator is not working

          I am not really sure what it each part does but, talking about the device it is mounted half inside half outside it is supposed to bring fresh air and remove contaminated air from the apartament.
          There is also a remote with which you control speed of the fan/motor. Can also turn on heat exchanger so it only pulls hot air from outside. And yeah there is a temperature/humidity sensor the blue square one. I assume it starts spinning the motors accordingly if it detects either.
          On the 4 way screw comes 230 AC and 2 motor wires

          1. Also I found one problem, the capacitor which I marked C1 in the picture reads short with continuity mode. Could it be the problem?

          2. About the broken joint is it the one I marked up in the attached image?

          Also did not mention that the device doesn't even turn on using the remote.
          Best Regards
          Attached Files
          Last edited by Awesomerp; 02-23-2023, 11:47 AM.

          Comment


            #6
            Re: Recuperator is not working

            Update
            Both of the capacitors C2 and C1 read short in circuit with continuity measurement.
            Attached Files

            Comment


              #7
              Re: Recuperator is not working

              Look for a shorted zener diode across those caps.
              Possibly in the 5v supply.
              "pokemon go... to hell!"

              EOL it...
              Originally posted by shango066
              All style and no substance.
              Originally posted by smashstuff30
              guilty,guilty,guilty,guilty!
              guilty of being cheap-made!

              Comment


                #8
                Re: Recuperator is not working

                I can see only these 3 Zeners, I will check them after work
                Attached Files
                Last edited by Awesomerp; 02-24-2023, 02:24 AM.

                Comment


                  #9
                  Re: Recuperator is not working

                  There may be a controller in the "short".

                  Comment


                    #10
                    Re: Recuperator is not working

                    Is there a way to test it?

                    Comment


                      #11
                      Re: Recuperator is not working

                      Also i have compared some value with the working pcb. And this zener "SH1"
                      shows 75kohm reading, while on the good pcb it is 6.4Mohms
                      Attached Files

                      Comment


                        #12
                        Re: Recuperator is not working

                        And this one?
                        Attached Files

                        Comment


                          #13
                          Re: Recuperator is not working

                          it is in the range of the megaohms, values were the same in the bad and working pcbs, SH1 only differed
                          Last edited by Awesomerp; 02-24-2023, 06:13 AM.

                          Comment


                            #14
                            Re: Recuperator is not working

                            Use diode check, not resistance.

                            But in the case of zeners, that only checks the forward direction.

                            These appear to use a capacitive dropper power supply for the 5v & related stuff. But you can probably connect a USB supply for testing.

                            Those red diodes aren't marked on the PCB; they can either be general purpose, like SMD 4148s, or zeners. For regulation, zeners typically have their anode (non banded end) connected to the negative side of those electrolytics.
                            "pokemon go... to hell!"

                            EOL it...
                            Originally posted by shango066
                            All style and no substance.
                            Originally posted by smashstuff30
                            guilty,guilty,guilty,guilty!
                            guilty of being cheap-made!

                            Comment


                              #15
                              Re: Recuperator is not working

                              Why do C1 and C2 read short in circuit?
                              Attached Files

                              Comment


                                #16
                                Re: Recuperator is not working

                                Originally posted by Awesomerp View Post
                                Why do C1 and C2 read short in circuit?
                                Solder C2 and check it in non-circuits (it happens that they are short), if it is normal, then either C1 or the controller remains.

                                Comment


                                  #17
                                  Re: Recuperator is not working

                                  Desoldered both c1 and c2 they are both fine.
                                  The empty tracks still read short, it means something further is short? Chip?

                                  Comment


                                    #18
                                    Re: Recuperator is not working

                                    What is the marking on the controller?

                                    Comment


                                      #19
                                      Re: Recuperator is not working

                                      it is PIC16F1826, I believe its this pdf
                                      Attached Files

                                      Comment

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