Dungs FRM-NOC 100025 HD, Instruction Manual, Page: 43 / 76

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MC • Edition 2022.08 • No
. 279 663 R
ev
. -0
43 … 76
Fault in the
regulator
Possible causes Troubleshooting
There is no gas
The regulator is not receiving gas.
Check the gas installation prior to the
regulator.
The SAV is closed. Unlock the SAV.
The regulator provides a
wrong outlet pressure.
The regulator contains a spring with the wrong set point. Replace the set point spring.
The desired output pressure is outside the possible output pressure
range.
Replace the regulator model.
Inlet pressure is too low. Check the gas system or resize the regulator.
With no flow volume the
outlet pressure corresponds
to the inlet pressure.
The pulse line is not connected.* Install the pulse line.
The pulse line is closed.* Check the pulse line
The pulse line has leaks.* Seal the pulse line.
The seal is damaged. Replace the seal.
The seat of the seal is damaged. Replace the seat of the seal.
The working diaphragm is damaged. Replace the working membrane.
The lever system is damaged. Replace the lever system.
The O-Rings juntas on the regulator are damaged. Replace the O-Rings of the regulator.
The O-Rings of the SAV are damaged. Replace the O-Rings of the SAV.
During operation the outlet
pressure corresponds to the
inlet pressure.
The pulse line is not connected.* Install the pulse line.
The pulse line is closed.* Check the pulse line
The pulse line has leaks.* Seal the pulse line.
The working diaphragm is damaged. Replace the working membrane.
The lever system is damaged. Replace the lever system.
As the flow rate increases,
the outlet pressure drops.
The desired flow rate exceeds the capacity of the regulator. Re-size the regulator and replace it.
Incorrect dimensioning of the gas pipe. Increase the nominal diameter of the line.
The gas filter before the regulator is dirty. Clean the gas filter, replace the filter screen.
The lever system is damaged. Replace the lever system.
The pulse line is closed. Check the pulse line
The SAV is damaged. Check the SAV.
Gas escapes at the vent
connection.
The working diaphragm is damaged. Replace the working membrane.
The O-Rings on the compensation shaft are damaged. Replace the lever system.
Outlet pressure is oscillating
in operation.
Required flow is lower than minimum operating flow.
Transitory situation at start-up. Nozzle change
for daming factor may help. Nozzle kit 270712.
Regulator is oversized. Replace regulator with the right one.
Ressonance effect with a regulator downstream.
Change nozzle configuration (kit 270712).
Change outlet pressure setting.
* in the case of regulator with external line