Radiant RS 20 E Installation And Maintenance Manual - page 15
Installation Manual
SYSTEM BOILER – Cod. 99951NA – November 2002
12
REGULATING THE MAX. AND MIN. MODULATION GAS PRESSURE
To regulate the maximum gas pressure to the burner proceed as follows:
• insert a gauge into the pressure socket B (fig.1).
• remove the aluminium protective cap from screw A (fig.1) counter-clockwise;
• turn the boiler on with the selector turned to the winter position;
• once ignited, set the "P1 MAX. HEAT"trimmer (fig.2) to the maximum and turn
screw A (fig.1) on the stabiliser clockwise to increase pressure or counter-
clockwise to decrease pressure (see the table below for calibration pressures);
• on completion, screw in the aluminium cap, protecting screw A, previously
removed from the gas valve;
• regulating the min. gas pressure: without removing the gauge and with the
selector set to winter, set the "P1 MAX. HEAT" trimmer to the minimum heat
by turning it counter-clockwise;
• regulate the minimum pressure by turning the "P2
MIN. GAS" trimmer (see the table below for
calibration pressures);
• on completion, set the "P1 MAX. HEAT"trimmer
back to the starting pressure;
• remove the gauge, tighten the pressure socket B
and make sure there are no gas leaks.
N.B. The "P1 MAX. HEAT" trimmer is factory set to
80% of the maximum nominal output during the
testing stage. When the boiler is started up for the first
time is must be regulated according to the thermal
power of the system.
To make adjustments use a flat head screwdriver and
turn clockwise to increase or counter-clockwise to
decrease.
MIN. AND MAX. GAS PRESSURES
Models:
NATURAL GAS G20
Min – Max
LIQUID BUTANE GAS G30
Min – Max
LIQUID PROPANE GAS G31
Min - Max
RS 20 E
mbar
1.5 – 10.5
6.6 – 27.5
8 – 35.6
RS 24 E
mbar
4.2 – 13.7
5 – 26.3
6 – 33.6
RS 30 E
mbar
3.1 – 12.6
9 – 32
MIN.GAS
MAX.RISC.
P1
P2
FU
SE
2A
TR2
TR1
D
B
10
20
30
40
A
MANOMETRO
VALVOLA GAS VK4105G1005
C
Fig. 1
Fig. 2