Polar Bear Plunger
One of my customers has a QT10068GNAC. It's fairly new and Operates on Natural gas.

We are having some over crank conditions because the incoming gas exceeds 18"" WC sometimes.

We have replaced regulators and this is driving me crazy.

Does Generac make gas solenoids that are designed for higher gas pressures in the incoming gas supply line? The present solenoids will not open above 18" W.C. If so is it a kit and can you get me everything necessary to make the change for slightly higher gas pressure.

Thanks
David
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Birken Vogt
Is this related to the other problem with the regulator?

If the regulator is creeping up very far past its setpoint then just repair or replace it.

If not then you need to add another regulator to keep utilization pressure within spec. It will have to be a very large diaphragm type with a large gas orifice if the pressure drop across it is low but it can be done.
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Ziller Tech
Polar Bear Plunger;37757 wrote:
One of my customers has a QT10068GNAC. It's fairly new and Operates on Natural gas.

We are having some over crank conditions because the incoming gas exceeds 18"" WC sometimes.

We have replaced regulators and this is driving me crazy.

Does Generac make gas solenoids that are designed for higher gas pressures in the incoming gas supply line? The present solenoids will not open above 18" W.C. If so is it a kit and can you get me everything necessary to make the change for slightly higher gas pressure.

Thanks
David


There isn't a kit available for this. The problem that you're facing is that the regulators in these units do not regulate down the pressure that comes into the unit really. It's more to meter the fuel based on vacuum pressure pulled by the engine. The higher fuel pressure will cause issues with the unit, even if you could get the solenoids to open. The easiest way to fix this would be to install a step down regulator for the generator to drop the pressure to the required amount that's spec'd in the owner's manual.
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BrentB
Chris Flagg;37964 wrote:
There isn't a kit available for this. The problem that you're facing is that the regulators in these units do not regulate down the pressure that comes into the unit really. It's more to meter the fuel based on vacuum pressure pulled by the engine. The higher fuel pressure will cause issues with the unit, even if you could get the solenoids to open. The easiest way to fix this would be to install a step down regulator for the generator to drop the pressure to the required amount that's spec'd in the owner's manual.


The solenoid is before the regulator. It has nothing to do with the regulator or how it works.
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Ziller Tech
BrentB;37985 wrote:
The solenoid is before the regulator. It has nothing to do with the regulator or how it works.


I think what he's asking for is a kit for a 'stronger' fuel solenoid that would open under the higher pressure. What I was trying to explain was that even if a kit were available, it would not correct the problem of actually having too high of a fuel pressure for the unit to run correctly. While the fuel solenoid doesn't affect how the regulator works, the higher fuel pressure certainly will...
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MEC
Anything higher than the spec WC is going to make the unit run rich and cause problems.
A secondary reg getting it down to where it should be like Chris mentioned is the only remedy.
What other appliances on the property run at that high a pressure?
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