My machine is GE MarkV Frame 9E DLN2. after three month we did fuel change over gas to distillate. But during test the machine tripped and "DWAT TOO LOW to suport TNR" ALARM appeared.

abdoullah.akbari [at] yahoo.com

 

This topic has been covered before on control.com. If you haven't used the 'Search' feature, please try it. It's not as user-friendly as the previous version (one has to precede each word with a '+' sign; there is Help available), and one may have to use several search terms (just like with any search engine) to find as many related posts and responses as possible, but there is information available.

For any site wishing to have reliable fuel transfers they <b>must</b> perform fuel transfers on a regular basis to "exercise" the liquid fuel system and components.

Further, a good understanding of the liquid fuel system and all of its components is necessary. Air in the liquid fuel line is the biggest problem, and with higher compressor discharge pressures these days it's not uncommon for liq fuel check valves to leak and back-pressure the lines through the liq fuel flow divider up to the Liq. Fuel Stop Valve.

Still further, there is evidence that the Liq. Fuel Stop Valve can be opened by back-pressure which means that hot combustion gases can make their way back into the supply piping, into the filters, etc.

This back-flow can cause carbonization of the liquid fuel in the lines, which can cause all manner of problems.

There are several options to reduce this problem, but all of them are expensive and involve sequencing modifications, new air-operated check valves, tubing modifications, solenoids, etc.

Liq fuel systems can still be made to be reliable, but it takes study and understanding, and it also takes regular and periodic fuel transfers.

And, when sites experience fuel transfer problems they are <b>less</b> likely to perform fuel transfers on a more regular basis. It's like watching a fit person exercise. It would seem that a fit person wouldn't need to exercise; but rather they wouldn't be fit if they didn't exercise.

It's the same for fuel transfers. The systems must be exercised, in order to pinpoint problem areas and plan for remedial actions to improve reliability.

But, again, two things are necessary: Regular fuel transfers to exercise the system and its components, and a good understanding of the system and its components and how they all operate together.

If you're looking for more concise help, it can't be provided with the information you've provided. You're going to have to do some research--both on control.com and on your machine and its control system--to come up with ideas for what happened and how to make your machine more reliable.