Glow-worm Betacom 24, Installation And Servicing Manual

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38
11.9 Heating power adjustment
The maximum heating output must be set in accordance with
the system requirements (stated in the project). Once you
know the power suitable for the heating system, refer to the
“BURNER PRESSURES” tables in Section 1 (Technical Infor-
mation) and fi nd the burner pressure for the boiler model and
for the type of gas used.
The regulation will be performed by the boiler’s controls, fol-
lowing a special procedure that avoids accidental activations
by the User.
Refer to Diagram 11.2.
— Loosen (2-3 turns) the screw of pressure tapping point for
gas outlet [1] of the gas valve and insert the manometer
sensor. Unthread from the “Vent” [3] the silicon tube com-
ing from the sealed chamber;
— supply the boiler and turn the Central Heating knob .to
Summer position ;
— ensure that there are NOT domestic hot water requests
(no open taps); if the room thermostat is installed, make
sure it is calling for heat (e.g. raise the requested room
temperature manually);
— turn the Hot Water knob on position and wait (approxi-
mately fi ve seconds) that both the green and red
indicators fl ash to short “pulses”. When that happens,
within 15 seconds turn the Central Heating knob on
the MAXIMUM value of the scale of the heating (fully
clockwise). The burner ignites to the maximum output not
modulated (the yellow indicator turns on);
— read on the manometer the value of the gas pressure to
the burner and turn the Central Heating knob along the
heating system temperature scale , until you read, on
the manometer, the burner pressure corresponding to the
power needed:
— do NOT move the Central Heating knob for about 30
seconds, until the green indicator stops fl ashing and
stays on. During this time, check that the pressure dis-
played on the manometer remains stabilized on the correct
value;
— turn the Hot Water knob on the scale from I to ; the
burner will turn off for a moment. Wait (about 5 seconds)
that both the green and red indicators stay on for
about 5 seconds (this is the confi rmation that the burner
pressure for heating is stored), then the red indicator
turns off;
— reinsert the tube in the “Vent” [3] of the gas valve. ATTEN-
TION:after this operation, the value measured by the ma-
nometer could decrease due to pressure compensation.
This fact is normal and does not require any change of the
regulation;
— unthread the manometer sensor and screw the pressure
tapping point screw for gas outlet [1]; verify that there is no
gas leak;
— to switch off the burner, turn the Central Heating knob
to the position .
The MAX power for the heating system is adjusted now.
The whole procedure should be completed within 15 minutes
from the start. If you exceed this time, or in case of mistakes,
the new pressure will not be stored and it will be necessary to
repeat the procedure from the beginning, by turning the Cen-
tral Heating knob on and the Hot Water knob on the
scale from I to .
1 = Pressure tapping point for gas outlet
2 = Pressure tapping point for gas inlet
3 = Vent
1
2
3 4
C
B
A
892_R00
Diagram 11.2
11 Commissioning