20030020
14
GB
Operation
6.5
Gas valve adjustment
The adjustment of the output of gas is achieved by using the two
screws V1 and V2 (Fig. 11).
To alter the maximum output of gas act on the screw V1.
–
To increase the output: turn the screw V1 anticlockwise (un-
screw).
–
To reduce the output: turn the screw clockwise (tighten).
To alter the minimum output of gas act on the screw V2 on the
gas valve. Remove the protection screw and act on the intern
screws with a hex key.
–
To increase the output: turn the screw clockwise (tighten)
–
To reduce the output: turn the screw anticlockwise (unscrew)
Definition of the adjustment for the fan:
The adjustments are carried out means on three potentiometers
on board of the motor control box.
START
determine the air during the start
MIN
determine the minimum modulation
MAX
determine the maximum modulation
The adjustment of “MIN” takes place outright at finishing the pre-
purging outlined by the valve opening and by the presence of the
discharge.
The authorisation to the maximum modulation with “MAX” occurs
about 10 sec by the valve opening.
6.6
Burner adjustment
To achieve optimal burner adjustment, the flue gases produced
by combustion must be analysed as they leave the generator. In
conformity with Efficiency Directive 92/42/EEC, the burner must
be applied to the generator, adjusted and tested in compliance
with the instruction manual of the generator in question, including
checking of CO and CO
2
concentration in flue gases and their
temperature.
Check in this order:
–
second stage output
–
first stage output
–
start-up output.
6.6.1
Second stage output
The second stage output power should coincide with that re-
quested by the generator used.
To increase or decrease its value, adjust trimmer MAX on the
control box.
Measure the gas delivery on the contactor to precisely establish
the burnt output.
Using a smoke analyser measure the value of the CO
2
or the O
2
in order to optimise the burner calibration.
The correct values are:
To correct these values act on the gas valve in the following way:
–
to increase the gas delivery and the CO
2
: turn the V1 screw
anticlockwise (loosen).
–
to reduce the gas delivery and the CO
2
: turn the V1 screw
clockwise (tighten).
6.6.2
First stage output
The first stage output power should coincide with that requested
by the generator used.
To increase or decrease its value, adjust trimmer MIN on the con-
trol box.
Measure the gas delivery on the contactor to precisely establish
the burnt output.
Using a smoke analyser, measure the value of the CO
2
or the O
2
in order to optimise the burner calibration.
The correct values are:
To correct these values act on thee gas valve in the following
way:
–
to increase the gas delivery and the CO
2
: turn the screw V2
in a clockwise direction (screw up).
–
to reduce the gas delivery and the CO
2
: turn the screw V2 in
an anticlockwise direction (unscrew).
Fig. 11
D7375
Minimum gas flow adjustment
Maximum gas flow adjustment (
V1
)
on the stabiliser (
V2
)
CO
2
O
2
G20
(methane)
8 - 9%
5 - 5.5%
G31
(LPG)
10 - 10.7%
5.7 - 6.2 %
CO
2
O
2
G20
(methane)
8 - 9%
5 - 5.5%
G31
(LPG)
10 - 10.7%
5.7 - 6.2 %
