21
fig. 24
C
A
B
fig. 25
RMP
MP
B
A
Connect the pressure gauge on
MP
(version
TN)
Connect the pressure gauge on
MP
and
RMP
(version
TFS)
MP
= Pressure tube
RMP
= Differential pressure point
MODULATION BOARD
PRESSURE MEASURING POINTS
Regulation info
3.4.2 - SWITCHING ON/OFF
To switch on and off the boiler follow the indi-
cations in the “
Users’ Instructions
”.
(pressure at the hydrometer 0.8/1 bar);
-
any cut-off taps of the system are open;
-
the mains gas corresponds to that with
which the boiler has been calibrated: othe-
rwise, convert the boiler to use the gas
available (see section: “MODIFICATION
FOR OTHER GASES “):
this operation
must be performed by qualified techni-
cians;
-
the gas supply tap is open;
-
there are no gas leaks;
-
the external mains switch is on;
-
the boiler’s safety valve is not locked;
-
there are no water leaks.
2.5 - STARTING THE
BOILER
2.5.1. - PRELIMINARY CHECKS
Before starting the boiler check that:
-
the flue gas exhaust duct and the outlet
section are installed correctly:
when the
boiler is switched on there must be no
leakage of any combustion products
from any seals;
-
the supply voltage of the boiler is 230 V-
50 Hz;
-
the system is correctly filled with water
2.6 - ADJUSTING
THE BURNER
All the instructions below are for the exclusi-
ve use of
qualified technicians.
All the burners leave the factory calibrated and
tested.
If it is necessary to change the calibration fol-
lowing changes in the type of gas or adapta-
tion to the supply network conditions, it is
necessary to recalibrate the gas valve.
To correctly regulate the gas valve, follow the
steps below:
A) Setting maximum power
-
Check the feed pressure value (see NOZ-
ZLES – PRESSURES table).
-
Remove the plastic cap
C
(fig. 24) protec-
ting the pressure regulator screws on the
top of the modulator coil.
-
Set the heating system water to the maxi-
mum temperature.
-
Connect a U gauge according to the in-
structions given in fig. 25.
-
Set the thermal power regulator
P
to MA-
XIMUM, turning CLOCKWISE.
-
Switch the Summer / Off / Winter / Anti-
freeze selector to the Winter position.
-
Check that the contact of the ambient ther-
mostat
TA
is closed.
-
Turn the (outer) nut
A
CLOCKWISE to in-
crease the pressure at the nozzles or AN-
TICLOCKWISE to decrease it.
B) Setting minimum power
-
Disconnect the modulator coil electrically.
-
Ignite the burner and check whether the
MINIMUM pressure corresponds to the
value shown in the NOZZLES-PRESSU-
RES table.
-
Set the required pressure. Hold the nut
A
firmly using a 10 mm spanner and turn the
screw
B
CLOCKWISE to increase the pres-
sure or ANTICLOCKWISE to decrease it.
-
Reconnect the coil.
C) Final operations
-
Recheck the maximum and minimum gas
valve pressures and adjust if necessary.
-
Remount the plastic cap
C
.
-
Close the gas intakes.
- Check for any gas leaks.
