15
IT
EN
FR
ES
FRG/2MBC(Z-F-R-M) - FRG/2MB(Z-F-R-M)
Madas Technical Manual
- 5|5.1b - REV. 0 of 15
th
Feb 2019
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
).
