DOMIproject F 24 - F 32
26
EN
cod. 3540R780 - 0
/201
(Rev. 00)
Adjustment of pressure at burner
Since this unit has flame modulation, there are two fixed pressure values: the minimum
and maximum, which must be those given in the technical data table according to the
type of gas.
•
Connect a suitable pressure gauge to pressure point
“B”
fig. 10 downstream of the
gas valve
•
Press the
RESET
button 3 times within 3 seconds to activate the
TEST
mode.
•
Turn the heating knob (detail 1 fig. 1) to min.
•
Adjust the minimum pressure with the screw "
D
fig. 10", clockwise to decrease it and
anticlockwise to increase it.
•
Turn the heating knob (detail 1 fig. 1) to max.
•
Check the max. pressure.
•
Press the
RESET
button 3 times within 3 seconds to exit the
TEST mode.
A
After checking or adjusting the pressure, make sure to seal the adjust-
ment screw with paint or a specific seal.
fig. 10 - Gas valve
A
Pressure point upstream
B
Pressure point downstream
D
Minimum pressure adjustment screw
Heating power adjustment
To adjust the heating power, switch the boiler to
TEST
mode (see sec. 4.1). Turn the
heating temperature control knob (ref. 1 - fig. 1) clockwise to increase the power or anti-
clockwise to decrease it. Press the
RESET
button within 5 seconds and the max. power
will remain that just set. Exit
TEST
mode (see sec. 4.1).
Ignition power adjustment
To adjust the ignition power, switch the boiler to TEST mode (see sec. 4.1).Turn the
DHW temperature adjustment knob (ref. 2 - fig. 1) clockwise to increase the power or an-
ticlockwise to decrease it. Press the RESET
button within 5 seconds
and the ignition
power will remain that just set. Exit TEST mode (see sec. 4.1).
4.2 Startup
Before lighting the boiler
•
Check the seal of the gas system.
•
Check correct prefilling of the expansion tank.
•
Fill the water system and make sure all air contained in the boiler and the system
has been vented.
•
Make sure there are no water leaks in the system, DHW circuits, connections or boil-
er.
•
Check correct connection of the electrical system and efficiency of the earthing sys-
tem.
•
Make sure the gas pressure for heating is that required.
•
Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler
Checks during operation
•
Switch the unit on.
•
Check the tightness of the fuel circuit and water systems.
•
Check the efficiency of the flue and air/fume ducts while the boiler is working.
•
Make sure the water is circulating properly between the boiler and the systems.
•
Make sure the gas valve modulates correctly in the heating and domestic hot water
production stages.
•
Check correct boiler lighting by performing various tests, turning it on and off with
the room thermostat or remote control.
•
Make sure the fuel consumption indicated on the meter matches that given in the
technical data table in cap. 5.
•
Make sure that with no demand for heating, the burner lights correctly on opening a
hot water tap. Check that in heating mode, on opening a hot water tap, the heating
circulating pump stops and there is regular production of hot water.
•
Make sure the parameters are programmed correctly and carry out any required
customisation (compensation curve, power, temperatures, etc.).
4.3 Maintenance
Periodical check
To ensure correct operation of the unit over time, have qualified personnel carry out a
yearly check, providing for the following:
•
The control and safety devices (gas valve, flow meter, thermostats, etc.) must func-
tion correctly.
•
The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. -The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
•
The air/fume terminal and ducts must be free of obstructions and leaks
•
The burner and exchanger must be clean and free of deposits. Do not use chemical
products or wire brushes for cleaning.
•
The electrode must be free of scale and properly positioned.
•
The gas and water systems must be tight.
•
The water pressure in the system when cold must be approx. 1 bar; otherwise bring
it to that value.
•
The circulating pump must not be blocked.
•
The expansion tank must be filled.
•
The gas flow and pressure must match that given in the respective tables.
4.4 Troubleshooting
Table. 5 - List of faults (Key LEDs
= Off /
= On /
= Fast blinking)
IN
OUT
B
A
D
Fault
Possible cause
Cure
Green
Yellow
Red
No burner ignition
No gas
Check the regular gas
flow to the boiler and
that air has been elimi-
nated from the pipes
Ignition/detection elec-
trode fault
Check the wiring of the
electrode and that it is
correctly positioned and
free of any deposits
Faulty gas valve
Check and replace the
gas valve
Ignition power too low
Adjust the ignition
power
Overtemperature pro-
tection activation
Heating sensor dam-
aged
Check the correct posi-
tioning and operation of
the heating sensor
No water circulation in
the system
Check the circulating
pump
Air in the system
Vent the system
Flame present signal
with burner off
Electrode fault
Check the ionisation
electrode wiring
Card fault
Check the card
Air pressure switch
(fails to close contacts
within 60 sec. of fan
activation)
Air pressure switch
contact open
Check the wiring
Faulty air pressure
switch wiring
Check the fan
Faulty baffle
Check the pressure
switch
Flue not correctly
sized or obstructed
Replace the baffle
Low system pressure
System empty
Fill the system
Water pressure switch
damaged or not con-
nected
Check the sensor
Delivery sensor fault
Sensor damaged
Check the wiring or
replace the sensor
Wiring shorted
Wiring disconnected
DHW sensor fault
Sensor damaged
Check the wiring or
replace the sensor
Wiring shorted
Wiring disconnected
Exchanger protection
activation.
(The LEDs blink alter-
nately)
No system H
2
O circu-
lation
Check the circulating
pump
Air in the system
Vent the system
