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91.7.1 - GB/IE
InstructIons pErtaInInG to thE InstaLLEr
To simplify calibration of the gas valve, the “calibration function” can be set directly on the boiler control panel
by proceeding as follows:
1) Press the
keys (2-3) together until the display shows the pointer “ ” alongside the and symbols
(about 6 seconds) (see fig. 16).
2) Press the
keys to set the fan speed at the minimum and maximum heat output (%PWM);
N.b - to set the
minimum
and
maximum
heat output quickly, press the
keys respectively;
3) press either of the two
keys to exit the function.
0307_2201
Figure 1
0310_01
14
Figure 15
pi:
Gas supply pressure connection point
p out:
Gas pressure to burner connection point
p:
Pressure connection point
for measurement of the OFFSET
pl:
Air signal input from fan
V:
Gas flow adjuster screw max fire
K:
OFFSET adjuster screw min fire
15. gas valve adjustment
Carry out the following operations in the given sequence:
1)
Calibration of the maximum heat output. Check that the CO
2
measured on the flue, with the boiler operating
at the maximum heat output, is the same as that shown in table 1. Otherwise, turn the regulation screw (V) on
the gas valve. Turn the screw clockwise to reduce the concentration of CO
2
and anticlockwise to increase it.
)
Calibration of reduced heat output. Check that the CO
2
measured on the flue, with the boiler operating at
the minimum heat output, is the same as that shown in table 1. Otherwise, turn the offset regulation screw
(K) on the gas valve. Turn the screw clockwise to increase the concentration of CO
2
and anticlockwise to
reduce it.
