Maintenance; Checking The Combustion Parameters - Riello Caldariello Condens 25 KIS User Manual

CALDARIELLO CONDENS 25 KIS
4.7 Gas conversion (fig. 41-42)
Gas conversion from one family of gases to another can also be easily
performed when the boiler is installed.
This operation must be carried out by professionally qualified personnel.
The boiler is designed to operate with methane gas (G20) according to the
product label.
It is possible to convert the boiler to propane gas, using the special kit.
For disassembly, refer to the instructions below:
- switch off the power supply to the boiler and close the gas tap
- remove in sequence: housing and air distribution box cover
- remove the fixing screw from the instrument panel
- unhook and turn the instrument panel forwards
- remove the gas valve (A)
- remove the nozzle (B) inside the gas valve and replace it with the nozzle
from the kit
- refit the gas valve
- remove the silencer from the mixer
- open the two half-shells by prising apart the corresponding hooks (C)
- replace the air diaphragm (D) in the silencer
- refit the air distribution box cover
- re-power the boiler and turn on the gas tap
Adjust the boiler as described in the chapter entitled "Adjustments" with
reference to the information on LPG.
Conversion must be carried out by qualified personnel.
Once the conversion is complete, affix the new identification
label supplied in the kit.

5 - MAINTENANCE

The appliance must be systematically controlled at regular intervals to
make sure it works correctly and efficiently and conforms to legislative pro-
visions in force.
The frequency of controls depends on the conditions of installation and
usage, it being anyhow necessary to have a complete check carried out by
authorized personnel from the Servicing Centre every year.
- Check and compare the boiler's performance with the relative specifica-
tions. Any cause of visible deterioration must be immediately identified
and eliminated.
- Closely inspect the boiler for signs of damages or deterioration, particu-
larly with the drainage and aspiration system and electrical apparatus.
- Check and adjust – where necessary – all the burner's parameters.
- Check and adjust – where necessary – the system's pressure.
- Analyze combustion. Compare results with the product's specification.
Any loss in performance must be identified and corrected by finding and
eliminating the cause.
- Make sure the main heat exchanger is clean and free of any residuals or
obstruction.
- Check and clean – where necessary – the condensation tray to make
sure it works properly.
IMPORTANT: always switch off the power to the appliance and close the
gas by the gas cock on the boiler before carrying out any maintenance and
cleaning jobs on the boiler.
Do not clean the appliance or any latter part with flammable substances
(e.g. petrol, alcohol, etc.).
Do not clean panelling, enamelled and plastic parts with paint solvents.
Panels must be cleaned with ordinary soap and water only.
The flame side of the burner is made of state-of-the-art material.
Being fragile:
- be particularly careful when handling, mounting or dismantling the bur-
ner and adjacent components (e.g. electrodes, insulation panelling etc.)
- avoid direct contact with any cleaning appliance (e.g. brushes, aspira-
tors, blowers, etc.).
This component does not need any maintenance, please do not remove it
from its housing, save where the O-ring may have to be replaced.
The manufacturer declines all responsibility in cases of damages due to
failing to observe the above.

5.1 Checking the combustion parameters

To carry out the combustion analysis, proceed as follows:
- set the main switch of the installation to the "OFF" position
- loosen the fixing screws (D) on the housing (fig. 13)
- move the base of the housing forwards and then upwards to unhook it
from the chassis
- loosen the fixing screws (E) on the instrument panel (fig. 14)
- lift then turn the instrument panel towards you
- loosen the fixing screws on the cover (F) to access the terminal board
(fig. 16)
- Press the "CO" button (fig. 26)
12
Live electrical parts (230 V AC).
- Wait for burner ignition. The display shows "ACO", the yellow LED flash-
es and the boiler operates at maximum heat output.
- insert the analyser probe in the ports provided in the air distribution box,
after removing the screws from the cover (fig. 40)
- check that the CO2 values match those given in the table, if the value
shown is different, change it as indicated in the chapter entitled "Gas
valve calibration".
- perform the combustion check.
Then:
- remove the analyser probe and close the sockets for combustion analy-
sis with the special screw
- close the instrument panel and refit the housing
The flue gas analysis probe must be fully inserted as far as
possible.
IMPORTANT
Even during the combustion analysis phase, the function that switches the
boiler off when the water temperature reaches the maximum limit (about
90°C) remains enabled.
5.2 Serial number
Domestic hot water function
Heating function
Qn Nominal heat delivery
Pn Nominal heat output
IP Degree of Protection
Pmw Maximum DHW pressure
Pms Maximum heating pressure
T Temperature
ŋ Performance
D Specific flow rate
NOx NOx class
Condensing Boiler
D: l/min
N.
00000000000
230 V ~ 50 Hz W
Pmw = bar T= 60 °C
Pms = bar T= 90 °C
****
Gas type: Gas category:
80-60 C 50-30 C
80-60 C
Qm
Qn =
Pm
Pn = Pn