First Start-Up - Madas FRG/2MBC Mode D'emploi

4.0 - MANUAL RESET
• Make sure that all valves and downstream taps are closed;
• Unscrew the cap (10);
• Lightly press the reset pin (18), wait a few moments for the pressure to balance and then fully press the reset pin (18);
• Hold down the reset pin (18), slowly open the ball valve downstream of the regulator;
• Release the reset pin (18), and pull it downwards slowly to prevent it from touching the centre pin (13);
• Then tighten the cap (10) back in the initial position.

5.0 - FIRST START-UP

Before commissioning, verify that:
• all of the instructions on the rating plate, including the direction of flow, are observed;
• the holes of the dust caps (25) and (29) are not clogged (regulator and shut off);
• IMPORTANT: The leak test of the piping must be performed without subjecting the diaphragm of the regulator
(therefore, the downstream pipe section) to a pressure higher than 300 mbar (for reinforced diaphragm 1.5 times
the regulator setting pressure). Use special manual gas closing devices to avoid damaging the regulator;
• The pressurisation manoeuvre of the equipment must be carried out very slowly so as to avoid possible damage.
NOTE: under no circumstances should a blind cap be installed in place of dust caps (25) and (29) as the
regulator and/or the safety shut offs may not work;
• Close the ball valve downstream of the regulator and partially open the downstream relief valve;
• Slowly open the upstream shut-off devices;
• Close the vent valve;
• Proceed by manually resetting the regulator (see 4.0);
• Close the downstream valve so as to close the regulator (the Pa value increases the SG value to fully close the obturator);
• Check the tightness of the system seals and check the internal/external tightness of the regulator, of the relief valve and of
the external sensor tube, if applicable;
• Slowly open the downstream valve and the shut-off valve;
• Check the operation of the regulator;
6.0 - SETTING
Before carrying out the operations, make sure that the supplied spring/s is/are suitable for the desired Pa - OPSO - UPSO and
differential relief valve fields.
6.1 - Adjusting the maximum pressure shut off (OPSO)
• Unscrew the cap (10);
• Use the supplied key (28) to fully tighten the adjustment ring nut of the maximum shut off (16);
• Start the system, reset the shut off device as indicated in 4.0 and make sure that there is no gas consumption (close the
applications downstream of the regulator);
Method 1:
1. Loosen and remove caps (27) and (10);
2. Use an 8 mm socket wrench (see fig. 1a and 2a) to press on the nut (26), slowly increasing the downstream pressure
to the desired value and simultaneously keep the nut (26) pressed; use the supplied key (28) to loosen the ring nut
(16) until the device is triggered;
3. Tighten the caps back to their original position and repeat the Pa setting steps;
Method 2:
1. Alternatively, use an auxiliary gas pressure to slowly increase the downstream pressure to the desired value and
simultaneously, use the supplied key (28) to loosen the ring nut (16) until the device is triggered (so as to avoid
having to set the Pa again);
• In both cases, reset the system by following the correct procedure and verify that the trigger value is that desired by repeating
the release step 2-3 times;
• If necessary, adjust the trigger value by turning the ring nut (16) with the specific key (28).
Madas Technical Manual - 5|5.1b - REV. 1 of 20
15
Feb 2020
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FRG/2MBC(Z-F-R-M) - FRG/2MB(Z-F-R-M)