Eco-King HWB-299, Installation And Service Manual

Page: 60 / 124

E93.1801EN171 HWB installation manual 60
11 CASCADING
Appliance
The Boilers have an internal flue gas valve for an overpressure system
according to the table below.
This device is needed to prevent recirculation of the flue gases.
If separated flue systems cannot be applied, ask a flue gas supplier to
calculate a zero-pressure common flue system.
11.1.1 C
ALCULATION
HWB (V
ALID FOR PARTS SUPPLIED BY
D
URAVENT
(M&G)).
Maximum vertical length in feet (m).
Type of
boiler
Number of
appliances
DN150 DN150/200 DN200 DN200/300
HWB-299
3 100 ft (30 m) 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
4 36 ft (11 m) 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
5 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
6 16 ft (5 m) 100 ft (30 m) 100 ft (30 m)
HWB-399
3 85 ft (26 m) 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
4 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
5 16 ft (5 m) 100 ft (30 m) 100 ft (30 m)
6 100 ft (30 m) 100 ft (30 m)
CHB-499
3 100 ft (30 m) 100 ft (30 m) 100 ft (30 m)
4 65 ft (20 m) 100 ft (30 m) 100 ft (30 m)
5 20 ft (6 m) 100 ft (30 m)
6 100 ft (30 m)
Remark 1: Dn 150/200 means: the diameter of the horizontal collector including the bend = 150 mm and after
the bend the diameter of the vertical section is 200 mm with an adaptor of 150->200 mm
Remark 2: Length between shaft and last collector (no. A) = 3.3 ft (1 m).
Remark 3: For calculating other lengths between the last collector and the bend, the length of the vertical
height must be reduced by the number of length and for bends the table below must be used.
11.1.2 T
ERMINALS EQUIVALENT FEET
Diameter
Elbow type DN150 DN200
45° 5.6 ft (1.7 m) 12.5 ft (3.8 m)
90° 13.2 ft (4.0 m) 19 ft (5.8 m)