78
Instructions for the installer
3.17.1 Relationship between temperature and nominal resistance of all NTC probes
T
(°C)
0
2
4
6
8
0
27203
24979
22959
21122
19451
10
17928
16539
15271
14113
13054
20
12084
11196
10382
9634
8948
30
8317
7736
7202
6709
6254
40
5835
5448
5090
4758
4452
50
4168
3904
3660
3433
3222
60
3026
2844
2674
2516
2369
70
2232
2104
1984
1872
1767
80
1670
1578
1492
1412
1336
90
1266
1199
1137
1079
1023
Tab. 17 Relationship between "Temperature and Nominal resistance" for temperature probes
3.18 Adaptation to other gas types and burner adjustment
WARNING
This boiler is built to run on the type of gas specified on the packaging and on the boiler rating plate.
Any later transformation is to be exclusively carried out by qualified personnel, using manufacturer designed accessories and
following the procedure and adjustment instructions for an accurate boiler setting-up.
3.18.1 Switching from NATURAL GAS to PROPANE
• Disconnect the boiler from the electric power supply.
• Open the boiler front casing.
• Loosen the three screws securing combustion chamber front panel to frame, then remove panel.
• Loosen the screw securing intake pipe to mixer, and remove pipe (see Fig. 29 Intake pipe).
• Disconnect the gas pipe from the mixer (see Fig. 29 Intake pipe).
• Loosen the three socket head screws, and remove the mixer (see Fig. 30 Mixer).
• Loosen the two retaining screws, and slide out mixer plastic body (see Fig. 31 Mixer plastic body).
• Using a 6 mm Allen wrench, loosen the two mixer nozzles (see Fig. 31 Mixer plastic body).
• Screw the new nozzles for propane listed in Tab. 19 Diameter of nozzles - diaphragms (mm), taking care to drive them fully home, without
tightening.
• Only for 32 kW versions model, insert the 7.2 mm diaphragm on the outlet of the gas valve.
WARNING
In case the nozzle idles when reaching the bottom of the nozzle threaded seat, it means that the thread is damaged and perfect
sealing is not ensured. The whole mixer shall be replaced.
• To refit the plastic body (Venturi), insert it inside mixer and secure it in place with the retaining screws. Take care not to damage the O-rings
assembled on plastic body ends (see Fig. 31 Mixer plastic body) and to respect the assembling direction (see Fig. 32 Assembling direction).
• Refit the reassembled mixer onto the fan with the socket head screws, making sure to insert the O-ring between mixer and fan (see Fig. 31
Mixer plastic body).
• Reconnect boiler to electric power supply, and open the gas cock.
• Enter programme setting and set parameters P4-P5-P6-P7-P8 on the values for propane gas, as shown in Tab. 10 Limits to be set for TSP
parameters and default values in relation to boiler type (TSP0).
• Adjust the gas valve (see par.
Gas valve setting
on page
81
).
