NEO FIRE – Technical Manual
47
16.5
Frost Protection
In order to protect the boiler agains frost, independent of heat requests or connected plant components,
boiler starts up the burner if temperature is lower than Frost protection setpoint. This value is set to 5ºC.
Important: if the boiler is going to be disconnected, drain the water to avoid frost
Check the siphon, frost can block it.
16.6
Chimneys
The flue outlet, according to the current rules, must ensure a correct evacuation of the burnt gases, without
backward flows and without producing condensate. The natural draught of the chimney must evacuate the
burnt gases from the boiler flue outlet.
16.6.1
Chimney sizing
The internal diameter depends on:
- Heat input of the boilers, type, number of boilers installed and water working temperatures.
- Type of gas.
- Chimney: vertical height, horizontal length (minimum slope: 3 to 5%).
- Number of elbows and their angles (they should be reduced to the minimum).
- The chimney material and if it is insulated or not.
If several boilers are connected to the same chimney, it is important to consider the distance between them
and the dimensions of the flue header.
The base of the vertical chimney must include a drainage pipe to evacuate the condensate.
With regard to boilers, these are the data to be considered for calculation:
Values of CO2, for Natural Gas
% CO
2
max load 9,5% ±0,3
% CO
2
min load
9,3% ±0,3
- Flues temperature:
Flues temp.
MAXIMUM POWER
MINIMUM POWER
Average Water temperature High ( 70ºC)
Low ( 40ºC)
High ( 70ºC)
Low ( 40ºC)
Flues Temp.
65 - 70ºC
43 – 46ºC
55 - 60ºC
28 – 30ºC
Summary of Contents for NEO FIRE 120
Page 1: ...TECHNICAL MANUAL OF INSTALLATION USE AND MAINTENANCE 07 2020 ...
Page 7: ...NEO FIRE Technical Manual 7 NEO FIRE 360 900 ...
Page 9: ...NEO FIRE Technical Manual 9 NEO FIRE 80 NEO FIRE 120 160 ...
Page 10: ...NEO FIRE Technical Manual 10 NEO FIRE 200 280 NEO FIRE 360 720 ...
Page 34: ...NEO FIRE Technical Manual 34 11 1 Electric drawing NEO FIRE 80 720 ...
Page 35: ...NEO FIRE Technical Manual 35 11 2 Electric drawing NEO FIRE 810 900 ...
Page 37: ...NEO FIRE Technical Manual 37 Electric drawing 1 Boiler with 3 heating circuits ...
Page 41: ...NEO FIRE Technical Manual 41 System drawing 1 Boiler and Domestic Hot Water DHWS ...
Page 58: ...NEO FIRE Technical Manual 58 System drawing D H W and heating circuit 11 11 ...
Page 59: ...NEO FIRE Technical Manual 59 System drawing of an old installation heating circuit 11 ...
Page 70: ...NEO FIRE Technical Manual 70 18 4 Position of probes and sensors ...