Ferroli Modena 80 E Manuel D’Utilisation
MODENA 80 E
23
• Check that the domestic hot water flow and
∆
T correspond to the table. Do not rely on empirical measurements.
Temperature should be measured using thermometers as near as possible to the boiler, bearing in mind the heat
loss from the pipes.
loss from the pipes.
• Check that the gas valve modulates correctly both during the central heating phase and the domestic hot water
production phase.
• Determine the combustion efficiency and the composition of the flue gases (refer to 8.04)
• If any of the above are not correct refer to Technical Data (page 5). Adjustment (page 41) and Troubleshooting
• If any of the above are not correct refer to Technical Data (page 5). Adjustment (page 41) and Troubleshooting
(page 58).
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.
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.
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.
“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).
(anticlockwise).
-
Operate boiler for central heating
-
Adjust minimum pressure by rotating screw «D»
clockwise to reduce pressure and anticlockwise to
increase pressure.
clockwise to reduce 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.
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 heating is not necessary because
for Central Heating 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.
Range Rating the central heating is not necessary because
for Central Heating 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.
IN
OUT
C
F
E B A D
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
Fig. 32