55
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
Table 21 - Relationship between "Temperature and Nominal resistance" for temperature probes
Relationship between temperature (°C) and nominal resistance (ohm) of all NTC probes.
3.7.
Adaptation to other gas types and burner adjustment
This boiler is built to run on the type of gas specified on the order, which is shown 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.
3.7.1.
Switching from NATuRAL GAS to PRoPANe
- Disconnect the boiler from the electric power supply.
- Remove boiler outer front panel.
- 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 (fig. 36).
- Disconnect gas pipe from mixer (fig. 36).
- Loosen the three socket head screws, and remove the mixer (fig. 37).
- Loosen the two retaining screws, and slide out mixer plastic body (fig. 38).
- Using a 6 mm Allen wrench, loosen the two mixer nozzles (fig. 38).
- Screw the new nozzles for propane listed in table 23, taking care to drive them fully home, without tightening.
- Only for the 32 kW model, insert the 7.2 mm diaphragm on the outlet of the gas valve.
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 (fig. 38) and to respect the assembling direction (fig. 39).
- Refit the reassembled mixer onto the fan with the socket head screws, making sure to insert the O-ring between mixer and fan (fig. 37).
- Reconnect boiler to electric power supply, and open the gas cock.
- Access the programming page to set the parameters P4-P5-P6-P7-P8 to the propane gas values, as described in table 19.
- Adjust the gas valve (see next paragraph, 3.7.3.).
3.7.2.
Switching from PRoPANe to NATuRAL GAS
- Disconnect the boiler from the electric power supply.
- Remove boiler outer front panel.
- 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 (fig. 36).
- Disconnect gas pipe from mixer (fig. 36).
- Loosen the three socket head screws, and remove the mixer (fig. 37).
- Loosen the two retaining screws, and slide out mixer plastic body (fig. 38).
- Using a 6 mm Allen wrench, loosen the two mixer nozzles (fig. 38).
- Screw the new nozzles for natural gas listed in table 23, taking care to drive them fully home, without tightening.
- Only for the 32 kW model, remove the 7.2 mm diaphragm on the outlet of the gas valve.
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.
