Gas Valve Calibration - Immergas EOLO STAR 24 4E Instructions And Warnings

3.8

GAS VALVE CALIBRATION.

The valve calibration must be carried out when the gas valve or
the P.C.B. is replaced or in the case of conversion to a different
type of gas.
To access the calibration phase, proceed as described below
(Par. 2.3):
Complete calibration
Before carrying out complete calibration, ensure that
all the requirements indicated in parag. 1.21.
No active requests for central heating or D.H.W. pro-
duction must be present and the boiler must not be
in "Stand-by" mode.
Possible adjustments
• Adjustment of boiler nominal thermal heat output.
- Activate the chimney sweep function (Ref. Par. 3.12) in DHW,
making sure that the maximum boiler output is reached (on
the display "99" is to be displayed).
- From the brass nut (Pos. 3 Fig. 34) adjust the boiler nominal
output, observing the maximum pressure values stated in the
tables (Par. 4.1) depending on the type of gas.
- By turning in a clockwise direction the heating potential incre-
ases and in an anti-clockwise direction it decreases.
• Adjust the boiler minimum heat output in the domestic hot water
phase (Fig. 34).
N.B.: only proceed after having calibrated the nominal pressure.
Adjustment of the minimum thermal input is obtained by opera-
ting on the cross plastic screws (2) on the gas valve maintaining
the brass nut blocked (3);
- press the button 4 (Fig. 30) up to reach the minimum boiler
output (on the display "00" is to be displayed). The pressure to
which the boiler minimum power must be adjusted, must not
be lower than that stated in the tables (par. 4.1) depending on
the type of gas.
VK 8105 M GAS valve
4
5
42
N.B.: to adjust the gas valve, remove the plastic cap (6); after
adjusting, refit the cap.
• Adjustment of the boiler minimum heat output in heating phase.
N.B.: only proceed after having calibrated the minimum dome-
stic hot water pressure.
To adjust the minimum heat output during the heating phase,
change parameter (5), increasing the value the pressure increases,
reducing it the pressure drops.
- The pressure to which the boiler minimum heat output must be
adjusted, must not be lower than that stated in the tables (Par.
4.1).
1
Key:
3
2
6
1 - Coil
2 - Minimum output adjustment screws
3 - Maximum output adjustment nut
4 - Outlet pressure point
Gas valve
5 - Gas valve inlet pressure point
6 - Protection hood
34