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DOMItech F 24 - F 32
H
F
I
R
B A
L
N
fig. 15 - Gas valve
A
Upstream pressure point
B
Downstream pressure point
C
Modureg electrical connection
D
Protection cap
E
Minimum pressure adjustment
F
Modureg
G
Minimum pressure adjustment
H
Compensation tube connection
I
Gas valve electrical connection
L
Sealed chamber
M
Pressure gauge
N
Compensation tube
R
Gas outlet
S
Gas inlet
Heating power adjustment
To adjust the heating power, switch the boiler to TEST mode (see sec. 4.1). Press the
heating buttons detail 3 - fig. 1 to increase or decrease the power (min. = 00 - max. =
100). Press the reset button within 5 seconds and the max. power will remain that just
set. Exit TEST mode (see sec. 4.1).
Lighting power adjustment
To adjust the lighting power, switch the boiler to TEST mode (see sec. 4.1). Press the
DHW buttons (detail 1 - fig. 1) to increase or decrease the power (min. = 00 - max. = 60).
Press the reset
button within 5 seconds and the lighting 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
D
E
G
S
C
F
+
M
B
cod. 3540R832 - 03/2011 (Rev. 00)
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
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault, the
display will flash together with the fault symbol (detail 11 - fig. 1) indicating the fault code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation, press the RESET button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to eliminate
the fault.
Faults marked with the letter "F" cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 8 - Fault list
Fault
Fault
Possible cause
code
No gas
Ignition/detection electrode fault
A01
No burner ignition
Faulty gas valve
Ignition power too low
Electrode fault
Flame present signal with
A02
burner off
Card fault
Heating sensor damaged
Overtemperature protection
A03
No water circulation in the
activation
system
Air in the system
Air pressure switch contact open
Air pressure switch (fails to
Faulty air pressure switch wiring Check the wiring
F05
close contacts within 20 sec.
Faulty baffle
of fan activation)
Flue not correctly sized or
obstructed
Low pressure in the gas system Check the gas pressure
No flame after the ignition
A06
Burner minimum pressure set-
stage
ting
Sensor damaged
F10
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Cure
Check the regular gas flow to the
boiler and that the air has been
eliminated from the pipes
Check the wiring of the electrode
and that it is correctly positioned and
free of any deposits
Check the gas valve and replace it if
necessary
Adjust the ignition power
Check the ionisation electrode
wiring
Check the card
Check the correct positioning and
operation of the heating sensor
Check the circulating pump
Vent the system
Check the pressure switch / Fan /
Fan socket
Make sure the baffle is correct
Check the length of the flues / Clean
the flues
Check the gas pressures
Check the wiring or replace the
sensor
EN
33
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