Use And Maintenance - Sime RMG 70 Mk.II Manual De Instrucciones

4

USE AND MAINTENANCE

4. 1 GAS VALVE (fig. 10)
"RMG Mk.II" boilers come equipped stan-
dard with a HONEYWELL VR 4605 C gas
valve (for "70 - 80" models), VR 4605 CB
gas valve (for "90 - 100" models) and VR
420 PB gas valve (for "110" models).
When the boiler is ignited the first time, it is
always recommended to bleed the piping by
using the pressure outlet upstream from
the valve (7 fig. 10 - 9 fig. 2).
4.2 GAS VALVE ADJUSTMENT
"VR 4605 C - VR 4605 CB"
Calibration of the operating pressures is
done by SIME in the factory. Consequently
they should not be altered. Only when you
switch to another type of gas (butane or
propane) is it permitted to alter the opera-
ting pressures.
It is essential that this operation be car-
ried out exclusively by authorized techni-
cal staff.
When the working pressures have been
adjusted, reseal the regulators.
When the gas pressures are to be reset,
this must be done following a set order: first
the maximum pressure and then the mini-
mum.
4.2. 1 Nominal pressure
adjustment (fig. 11)
To set the maximum pressure, proceed as
follows:
– connect the pressure column or a pres-
sure gauge to the pressure intake loca-
ted on the burner manifold;
– unscrew the screw (4) completely;
– set the knob of the thermostat to the
maximum value;
– supply electric power to the boiler;
– loosen the locknut (1) and turn the con-
nection (3):
to reduce the pressure, turn the connec-
tion counterclockwise; to increase the
pressure, turn the connection clockwise;
– tighten the locknut (1);
– operate the main switch a number of
times, making sure that the maximum
pressure corresponds to the values
given in Table 1.
HONEYWELL VR 4605 C - VR 4605 CB
HONEYWELL VR 420 PB
TABLE 1
Methane - G20
Burner max. pressure
Burner min. pressure
Butane - G30
Burner max. pressure
Burner min. pressure
Propane - G31
Burner max. pressure
Burner min. pressure
4.2.2 Reduced pressure
adjustment (fig. 11)
To set the reduced pressure, proceed as
follows:
– deactivate the coil (2) electric supply;
– switch on the boiler and after a short
LEYENDA
1 Locknut M13
2 Coil
3 Max. press. adjust. connection
4 Min. pressure adjust. screw
1
9
2
3
70 Mk.II 80 Mk.II
mbar 9.3 9. 1
mbar 4.5 4.6
mbar 25.2 25.4
mbar 12.2 12.3
mbar 32.6 30.2
mbar 16.4 16. 1
period of operation at nominal output,
tur n t he t her mos t at knob slow l y
towards the minimum position until you
hear the click of the first contact of the
thermostat;
– leave the knob in that position and, tur-
ning the screw (4), seek the minimum
pressure value according to Table 1 for
the gas in question: to reduce the pres-
sure, turn the screw counterclockwise;
to increase the pressure, turn the screw
clockwise;
– restore electric power to the coil;
– operate the main switch a number of
times, making sure that the minimum
pressure corresponds to the value given
in Table 1.
4.3
Fig. 11
Calibration of the operating pressures is
KEY
1 EV1 coil
2 Pressure regulator
3 Coil assembly
4 EV2 coil
5 LPG adaptor
6 Plastic cap
7 Pressure inlet upstream
8 Pressure inlet
downstream
9 EV1- EV2 coil
Fig. 10
90 Mk.II 100 Mk.II 110 Mk.II
9.3 9.3 9.3
4.7 4.7 4.6
25. 1 25. 1 25.6
12.0 12.5 12.6
30.0 32.7 34.3
15.6 16.6 16.6
GAS VALVE ADJUSTMENT
"VR 420 PB"
IT
ES
PT
GB
55