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  1. #1
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    Aug 2018
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    Gaggia G90 electrical question, switch wiring

    Hello,

    I recently rebuilt and rewired a 1986 Gaggia d90 2 group.
    It was purchased off an auction site in very rough shape, so everything was rebuilt.

    I rewired it according to how it was wired when I received it, and have consulted the D90/E90 evolution manual that I was able to download online.

    The issue I am having is that only 120V is going from the switch to the control board. My understanding is that it should be 220V.

    I think I may have an issue with the switch wiring. Does anyone have a d90 that they could take a photo of the switch for me?


    Here is the switch wiring diagram that I have for a d90:

    The first is the wiring going from the control board
    Click image for larger version. 

Name:	Screen Shot 2018-08-05 at 1.53.40 PM.png 
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    The second is the high power side, so the wiring going to the switch:
    Gaggia G90 electrical question, switch wiring-screen-shot-2018-08-05-1.55.04-pm.png

  2. #2
    Junior Member
    Join Date
    Aug 2018
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    2
    With a little help, we were able to draw a schematic of how the switch works.
    This is the switch.
    It has 18 terming, arranged in 3 rows of 6.
    1-6, 7-12, 13-18.

    Gaggia G90 electrical question, switch wiring-1319066.jpg
    Gaggia G90 electrical question, switch wiring-img_0186.jpg

    Of the 4 positions:
    off: nothing is connected
    pos1: (1 and 2) (7 and 8 ) and (13 and 14) are connected, which powers the circuit board.
    pos2: also connected are (3 and 4) (9 and 10) (13 and 14), in this position 2 of the 3 heating coils have power.
    pos3: also connected are (5 and 6) (11 and 12) (17 and 19), in this position the 3rd heating coil has power.

    As the machine came without a plug, and had a 5 wire harness, using a 5 wire setup to the plug to the 220 outlet. 2 live (120v each), 2 neutral and 1 ground.

    I wired the switch the same way I received it.

    Coming from the outlet:
    A live wire is connected to 7 and 4
    Neutral is connected to 17 and 13
    group is connected to ground point not the frame

    2 wires also connected 10 to both 6 and 7.

    Going to the control board:
    live (black) is connected to 8
    neutral (blue) to 14
    14 and 8 also had a wires going to a indicator light.

    3 wires went from the switch to the pressure stat:
    black from 9
    red from 3
    yellow from 5
    Last edited by greesha; 08-05-2018 at 02:01 PM. Reason: typo

 

 

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