Adjustment And Gas Conversion - Ferroli Domina 80 E Installation, Service And User Instructions Manual

5. ADJUSTMENT AND GAS CONVERSION

5.01 Adjusting the pressure and flow rate to the main burner
This boiler operates on the flame modulation principle. It has two fixed pressure values, minimum and
maximum, which must be as shown in the table (pages 5), whichever type of gas is used.
Note - Because correct minimum and maximum pressures are critical to the efficient operation of the
boiler it is ESSENTIAL that the following adjustments are carried out by COMPETENT personnel ONLY.
5.02 Adjusting minimum and maximum pressure Honeywell V K4105G gas valve
- Connect suitable pressure gauge to burner test point "B" downstream of the gas valve.
- Disconnect the pressure compensation tube «F».
- Remove the protective cap «C».
- Adjust potentiometre P3 (on the main
board) at minimum (anticlockwise).
- Operate boiler for central heating
- Adjust minimum pressure by rotating screw
«D» clockwise toreduce pressure and
anticlockwise to increase pressure.
- Adjust potentiometre P3 at maximum
(clockwise)
- Adjust max pressure by rotating screw «E»,
clockwise to increase pressure and
anticlockwise to reduce pressure.
- Reconnect the pressure compensation tube
«F».
- Replace protective cap «C».
Maximum + Minimum possible gas pressures
are now set. Range Rating the central heat-
ing is not necessary because for Central Heat-
ing the Auto Range Rating facility will set the
burner pressure to set the system unless the
boiler thermostat is set to max, when the
burner pressure will go to max output.
Legenda
A = Gas inlet test point
B = Gas outlet test point
C = Protection cup
D = Min. pressure adjusting screw
E = Max. pressure adjusting screw
F = Balancing tube
DOMINA 80 E
F
Fig. 32
C
E B A D
41