NINFA 24 MCS
43
GB
cod. 3540F611 - 05/2007 (Rev. 00)
System water charcteristics
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO
3
), the use of suitably treated water is advisable in order
to avoid possible scaling in the boiler. The treatment must not in any case reduce the hardness to values below 15°F
(Decree 236/88 for uses of water intended for human consumption). Water treatment is indispensable in the case of
very large systems or with frequent replenishing of water in the system. If partial or total emptying of the system be-
comes necessary in these cases, it is advisable to refill it with treated water.
Antifreeze system, antifreeze fluids, additives and inhibitors
The boiler is equipped with an antifreeze system that turns on the boiler in heating mode when the system delivery water
temperature falls under 6°C. The device will not come on if the electricity and/or gas supply to the unit are cut off. If it
becomes necessary, it is permissible to use antifreeze fluid, additives and inhibitors only if the manufacturer of these
fluids or additives guarantees they are suitable for this use and cause no damage to the heat exchanger or other com-
ponents and/or materials of the boiler unit and system. It is prohibited to use generic antifreeze fluid, additives or inhib-
itors that are not expressly suited for use in heating systems and compatible with the materials of the boiler unit and
system.
Antifreeze kit for outdoor installation (optional)
In case of installation in a partially protected place, the boiler must be equipped with the special antifreeze kit for pro-
tecting the DHW circuit. The kit comprises a thermostat (A fig. 19) and four electric heaters (R... fig. 19). Connect the
kit to the electronic board as shown in the wiring diagram (see fig. 31). Position the thermostat and heaters on the DHW
circuit pipes as shown in the following diagram.
fig. 19 - Positioning of antifreeze thermostat and heaters
2.4 Gas connection
B
Before making the connection, ensure that the unit is arranged for operation with the type of fuel available and
carefully clean all the pipes of the gas system to remove any residues that could affect good functioning of the
boiler.
The gas must be connected to the relative connector (see fig. 28) in conformity with current standards, with rigid metal
pipes or with continuous flexible s/steel wall tubing, placing a gas cock between the system and the boiler. Make sure
that all the gas connections are tight. The capacity of the gas meter must be sufficient for the simultaneous use of all
equipment connected to it. The diameter of the gas pipe leaving the boiler does not determine the diameter of the pipe
between the unit and the meter; it must be chosen according to its length and loss of head, in conformity with current
standards.
B
Do not use the gas pipes to earth electrical appliances.
R1
A
R2
R4
R3
Summary of Contents for NINFA 24 MCS
Page 155: ...NINFA 24 MCS 155 EL cod 3540F611 05 2007 Rev 00 5 1 9 1 2 6 1 9 1 3 Comfort Comfort 6 1 9 1 4...
Page 157: ...NINFA 24 MCS 157 EL cod 3540F611 05 2007 Rev 00 3 1 8 1 4 3 1 9 3 1 1 1 30 C 85 C 45 C 10...
Page 172: ...NINFA 24 MCS 172 EL cod 3540F611 05 2007 Rev 00 3 2 B sez 4 4 sez 1 3 sez 4 4 3 3 1 bar A...
Page 175: ...NINFA 24 MCS 175 EL cod 3540F611 05 2007 Rev 00 F37 F39 A41 F42 F43 H2O F50...
Page 182: ......
Page 183: ......
