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Doc890/3456CV02B 33
Type Flue gas tem-
perature at
full capac ity
(approx.)
Flue gas quantity at full
capacity
Maximum
permissible
chimney
resistance
°C
m
3
/h kg/s mbar
R3401
R3402
R3403
R3404
R3405
R3406
165
165
165
165
165
165
1423
1580
1848
2091
2334
2578
0.330
0.367
0.428
0.485
0.541
0.598
1.5
1.5
1.5
1.5
1.5
1.5
R3501
R3502
R3503
R3504
R3505
155
155
155
155
155
1287
1505
1703
1901
2099
0.306
0.357
0.404
0.451
0.498
1.5
1.5
1.5
1.5
1.5
R3601
R3602
R3603
R3604
R3605
85
85
85
85
85
1076
1258
1424
1590
1756
0.306
0.357
0.404
0.451
0.498
1.5
1.5
1.5
1.5
1.5
Table 9 Flue gas data
Capacity 100 %
Flow temperature 80 °C
Return temperature 60 °C
5.3.5.2 Chimney
Chimney length
Because the appliance is fi tted with a “premix burner” with a fan, an over-pressure is built up
in the unit. This overpressure is suf cient to overcome the resistance of the cooled burner, heat
exchangers, air intake and chimney upto a maximum of 1,5 mbar external to the boiler.
The back-pressure outside the unit depends on:
a The resistance of the fl ue pipe
b The degree of cooling of the burner system
c The resistance of the discharge system.
The degree of cooling of the fl ue gasses depends on:
a the insulation value of the chimney
b the local ambient temperature
c the discharge system.
The ue connection diameters of the units have been chosen such that the speed of the fl ue gas
will always be approximately 4 till 5 m/s. For the appliance there will be a maximum
overpressure of approximately 1.5 mbar (150 Pa) for the fl ue system (see table 10 for lengths).
y
Owing to their high resistance, bends with an R/D ratio smaller than 1 should be avoided. It may
happen that these must be used, in which case the chimney length must be calculated with the
aid of table 11. We advise fi tting the horizontal pipe section with a fall so that any condensate
formed can be drained via the boiler.
30


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