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4.2 System start-up
B
Checks to be made at first ignition, and after all maintenance operations that
involved disconnecting from the systems or an intervention on safety devices
or parts of the boiler:
Before lighting the boiler
•
Open any on-off valves between the boiler and the systems.
•
Check the tightness of the gas system, proceeding with caution and using a soap
and water solution to detect any leaks in connections.
•
Check the correct preloading of the expansion tank (ref. sec. 5.3)
•
Fill the water system and make sure that all air contained in the boiler and the sys-
tem has been vented by opening the air vent valve on the boiler and any vent valves
on the system.
•
Make sure there are no water leaks in the system, hot water circuits, connections or boiler.
•
Check the correct connection of the electric system and the functioning of the earth system. l
•
Check that the gas pressure value for heating is as required.
•
Make sure there are no flammable liquids or materials in the immediate vicinity of the boiler
Checks during operation
•
Ignite the appliance as described in sec. 2.3.
•
Check the airtightness of the fuel circuit and water systems.
•
Check the efficiency of the flue and air-fume ducts while the boiler is working.
•
Check that the water is circulating properly between the boiler and the systems.
•
Make sure that the gas valve modulates correctly in both the heating and hot water
production phases.
•
Check the proper ignition of the boiler by performing various tests, turning it on and
off with the room thermostat or remote control.
•
Make sure that the fuel consumption indicated on the meter corresponds to that giv-
en in the technical data table in sec. 5.3.
•
Make sure that with no call for heating the burner correctly ignites on opening a hot
water tap. Check that during heating operation, on opening a hot water tap, the heat-
ing circulator stops and there is a regular production of hot water.
•
Check the parameters are programmed correctly and perform any required custom-
ization (compensation curve, power, temperatures, etc.)
4.3 Maintenance
Periodical check
To ensure proper 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, flowmeter, thermostats, etc.) must function 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. For cleaning do not
use chemical products or wire brushes.
•
The electrode must be free of scale and properly positioned.
•
The gas and water systems must be tight.
•
The water pressure in the cold water system 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 flowrate and pressure must match that given in the respective tables.
The boiler casing, control panel and aesthetic parts can be cleaned with a soft
A
damp cloth, if necessary soaked in soapy water. Do not use any abrasive de-
tergents and solvents.
Opening the casing
To open the boiler casing:
1.
Undo the screws A (see fig. 27).
2.
Turn the casing (see fig. 27).
3.
Lift the casing.
B
Before carrying out any operation inside the boiler, disconnect the electrical
power supply and close the gas cock upstream
A
1
A
fig. 27 - Opening the casing
40
EN
Combustion analysis
Two sampling points have been included at the top of the boiler, one for fumes and the
other for air. To take samples:
1.
2.
3.
4.
5.
6.
1 =
2 =
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 22 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation just press the RESET button (detail 8 - fig. 1) for 1 second or RESET on the
optional remote timer control if installed; if the boiler fails to start, it is necessary to first
eliminate the fault.
Other faults (marked with the letter "F") cause temporary shutdowns that are automati-
cally reset as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 5 - List of faults
3
2
cod. 354
- Rev. 00 - 09/2013
Open the air/fume outlet plug;
Insert the probes as far as the stop;
Check that the safety valve is connected to a drain funnel;
Activate the TEST mode;
Wait 10 minutes for the boiler to stabilise;
Take the measurement.
1
2
fig. 28 - Fume analysis
Fumes
Air
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
A02
with burner off
Card fault
Heating sensor damaged
Overtemperature pro-
A03
tection activation
No water circulation in system
Air in the system
The air pressure
Incorrect air pressure transducer
transducer does not
wiring
F05
receive a sufficient
Flue obstructed or not correctly
minimum value within
sized
25 seconds
Low pressure in gas system
No flame after ignition
A06
phase
Burner minimum pressure setting
Jumper on connector X5 not con-
F07
Fault in wiring
nected (terminals 4 and 5)
Sensor damaged
F10
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Sensor damaged
F11
DHW sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
Hot water tank sensor
F12
Wiring shorted
fault
Wiring disconnected
DIVAtop ST F
Cure
Check the regular gas flow to the
boiler and that the air has been elimi-
nated 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 wiring
Check the length of flue and that it is
clean
Check the gas pressure
Check the pressures
Check the wiring
Check the wiring or replace the sen-
sor
Check the wiring or replace the sen-
sor
Check the wiring or replace the sen-
sor
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