DVisa
Hi everybody - I am new here, have a 16 kW Guardian propane model 0052440, s/n 4460440, bought in the fall of 2008. It does not fire and storm season is coming in Kentucky where I live. A local repair guy found no fuel pressure downstream of the regulator but there was pressure upstream.
I bought a regulator from Ziller and it came with a solenoid on top, so we now have two solenoids.
The original generator fuel path was solenoid - to plenum - to regulator.
Where should the solenoid be installed -
(1) on top of the plenum as manufactured (which I would think more logical), or
(2) on top of the regulator?
Thank you very much for your help.
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Geoff Z
Posting this schematic so the guys know what they are working on:
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Peddler
There should be only one solenoid on the cast aluminum piece as shown in the PDF.  You need to make sure you are getting 12 volts to the solenoid via the #14 wire which energizes after the controller gets its crank signal from the coils via the #18 wire.  Once the control board sees that the unit is cranking it turns on the power to the 14 wire which opens the solenoid.
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DVisa
Thank you Geoff Z and Peddler. Your pdf is also what's in my manual. The solenoid is clearly on top of the plenum.
Our confusion comes from the fact that the regulator from Ziller also came with a solenoid on top even though the image they sent me has no solenoid.
Would you agree that I should
(1) Take the solenoid off the top of the Ziller regulator and set it aside
(2) Cap the top of that regulator with parts 3 and 31 from the diagram?
The original solenoid appears to work, it opens the fuel valve and there is fuel pressure downstream.
Thanks again
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Peddler
Did the unit you received not have the blank plate installed?  I would use the new solenoid that came on the unit.  I am a little confused I thought you were not getting down stream fuel but now you are with the original regulator?  
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DVisa
The regulator I received had a solenoid instead of the blank plate - for some reason. That's why we were confused.
When testing the original configuration the repairman found fuel pressure downstream from the old solenoid, but not downstream from the old regulator.
I have not yet installed the new regulator.
It seems that we agree as follows (let me know if you don't)
(1) I should replace the old solenoid on top of the plenum with the new solenoid
(2) should order the blank plate (parts 3 and 31 on the diagram) from Ziller and install on top of the new regulator
(3) connect and install everything
Thanks again for your help
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78buckshot
You will only get fuel down stream of the regulator when the engine is cranking, the regulator needs the vacuum from the intake pulse to open the internal  regulator valve.
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DVisa
Thank you 78buckshot. I remember that the repairman was cranking the engine when measuring the pressure.
As far as the next steps, do you agree with my previous posting?
Thanks
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Peddler
Why don't you use the plate and gasket off the old demand regulator.
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DVisa
Of course! Thanks, the parts are at the repairman's so I did not get that idea.
Great, I think I am on the right track.
Thanks everybody!
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78buckshot
The demand regulator is not a high failure part, very simple mechanics within. It may have been stuck and you therefor would not see fuel pressure downstream. Once you have the new parts installed you want to adjust the regulator outside of the generator to 12.5 - 13.0 inches static, then try to start the engine. If it still has trouble I would recommend adjusting the engine intake and exhaust valves. You can refer to a guide elsewhere in this forum.
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