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Thread Number: 48916
Arthur-Martin 792.08 washing machine modification. |
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| Post# 708436 10/10/2013 at 16:20 (3,844 days old) by statomatic (France) | ||
Hi, these Arthur-Martin machines are very nice (click on the link to see the pics on my photo album) but they are strangely designed, the half load function can be used only on delicate programs.
After making a slight wiring mod (by changing the order of the half load button and two timer switches) the half load function can be used on normal programs (but there is no cooling down at the end of wash). Here is the original schematic diagram: CLICK HERE TO GO TO statomatic's LINK 
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| Post# 708440 , Reply# 1 10/10/2013 at 17:02 (3,844 days old) by statomatic (France) | ||
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The modified diagram and a small circuit description:
On the left there is the 220V line and the main switch.
Then the step by step timer motor controlled by the 64-58 switch for cam positioning, A-B for going to the next step, 31-25 for temperature control and 33-39 for reduce the final spin time. The 62-60 switch is opened when the timer is in cam positioning mode for prevent timer switches destruction. The 4-6 switch is used for stop the machine at the last rinse (anti crease function) mode when 1-1A of the selector is open. The pressure switch (pressostat) supply the electrovalves by 12 for the low filling level (washing and half load) or by 22 for the high filling level (prewash and rinses). On the original diagram the 28-30 switch is used on the normal programs for the high filling level, it is directly connected to the pressure switch therefore the half load button (1/2 charge) cannot work. When connecting the "28" wire to the "26" wire instead of the 22 pressure switch the half load function can be used on normal programs :) 
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| Post# 708441 , Reply# 2 10/10/2013 at 17:07 (3,844 days old) by statomatic (France) | ||
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| Post# 708443 , Reply# 3 10/10/2013 at 17:18 (3,844 days old) by statomatic (France) | ||
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Detailed view of the timer | ||
| Post# 708444 , Reply# 4 10/10/2013 at 17:23 (3,844 days old) by statomatic (France) | ||
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| Post# 708449 , Reply# 5 10/10/2013 at 17:41 (3,844 days old) by statomatic (France) | ||
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| Post# 708452 , Reply# 6 10/10/2013 at 17:49 (3,844 days old) by statomatic (France) | ||
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End of the modification
A jumper wire is added between timer 26 and 28.
The wire that goes to the 22 of the pressure switch and the wire that goes to the 1D of the half load button are connected together by another jumper (the 6.35mm connectors are insulated with a shrink tube). The dismounted parts were reinstalled in reverse order, now I can use the half load function on the normal programs ! 
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Post# 709223 , Reply# 7 10/14/2013 at 07:05 (3,840 days old) by chestermikeuk  (Rainhill *Home of the RailwayTrials* Merseyside,UK) |
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Sibel... | ||
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Post# 1160370 , Reply# 8 9/25/2022 at 10:33 (572 days old) by chetlaham (United States) |
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Thank you for the diagram and pictures!  | ||
| Post# 1160646 , Reply# 9 9/29/2022 at 13:29 (568 days old) by statomatic (France) | ||
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Thanks, yes these machines are quite complicated but that's not the worst I've seen.
This Sibel timer has a nice feature that makes the knob easy to turn. There's a clutch between the knob and the cams, you turns the knob to the chosen program, this closes a switch turning on the program cams motor, it stops when the cams are in sync with the knob and the program starts. Some Thomson machines also used this feature. | ||
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