23
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.16 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
The following checks and maintenance should
be performed at least once a year.
- Clean the flue side of the heat exchanger.
- Clean the burner.
- Check the correct positioning, integrity and
cleanliness of the detection and ignition elec-
trode; remove any oxide present.
- Visually check the draught-breaker/anti-wind
device for deterioration or corrosion.
- Check correct lighting and operation.
- Ensure correct calibration of the burner in
domestic water and heating phases.
- Check correct operation of control and adjust-
ment devices and in particular:
- system control thermostat intervention;
- domestic hot water control thermostat inter-
vention.
- Check sealing efficiency of gas circuit and the
internal system.
- Check the intervention of the device against no
gas ionisation flame control. Intervention time
must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, after discharging system pressure
and bringing it to zero (read on boiler pressure
gauge), the expansion vessel load is at 1.0 bar.
- Check that the system static pressure (with
system cold and after refilling the system by
means of the filling valve) is between 1 and 1.2
bar.
- Check visually that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- water pressure switch;
- flue gas control thermostat.
- Check the condition and integrity of the elec-
trical system and in particular:
- electrical power cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
NOTE:
in addition to yearly maintenance, you
must also check the thermal system and thermal
efficiency, with the frequency and procedures
that comply with the technical regulations in
force.
3.17 VARIABLE HEAT OUTPUT.
NOTE:
gas flow rates refer to heating power
below a temperature of 15°C and pressure of
1013 mbar. Burner pressure values refer to use
of gas at 15°C.
METHANE (G20)
BUTANE (G30)
PROPANE (G31)
HEAT
THERMAL
HEAT
THERMAL
GAS FLOW
RATE
BURNER
PRESS. NOZZLE
BURNER
GAS FLOW
RATE
BURNER
PRESS. NOZZLE
BURNER
GAS FLOW
RATE
BURNER
PRESS. NOZZLE
BURNER
(kW)
(kcal/h)
(m
3
/h)
(mbar)
(mm H
2
O)
(kg/h)
(mbar)
(mm H
2
O)
(kg/h)
(mbar)
(mm H
2
O)
MAX.
23.6
20296
2.74
14.00
142.8
2.05
28.00
285.5
2.01
35.60
363.0
MIN CH.
9.5
8170
1.14
2.77
28.3
0.85
5.00
51.0
0.84
6.43
65.5
MIN. DHW
7.0
6020
0.86
1.70
17.3
0.64
3.00
30.6
0.63
3.00
30.6