E93.1803.901 HW
57
Typical examples
A
:
Twin pipe system with separate pipes for flue gas and air supply
C63
B
:
Twin pipe system with separate pipes and concentric roof terminal
C33
C
:
Single pipe for flue gas outlet only (air supply from water heater room)
B23
D
:
Concentric pipe for flue gas/air supply (roof-mounted)
C33
E
:
Concentric pipe for flue gas/air supply (wall-mounted)
C13
F:
Separate air supply duct & flue duct in different pressure zone
C53
NOTICE: specific resistance values of ECO-HS flue gas and air intake parts are used for these
examples. Other suppliers can have deviating values!
10.1.6
E
XAMPLE
A:
T
WIN PIPE SYSTEM WITH SEPARATE PIPES FOR FLUE OUTLET AND AIR SUPPLY
Calculation example with given lengths: checking resistance
Water heater type:
CB 155
Flue gas
Diameter: 150 mm
quantity
Pa
Pa total
Straight tube /m
total
9
1.3
11.7
Bend
90°
2
4.9
9.8
Flue outlet
zeta=1.0
1
6.3
6.3
Total resistance flue gas outlet:
27.8
A
ir
su
pp
ly
Diameter: 150 mm
quantity
Pa
Pa total
Straight tube /m
total
8
1.5
12.0
Bend
90°
2
5.7
11.4
Air inlet
zeta=1.0
1
7.3
7.3
Total resistance air supply:
30.7
Total resistance flue gas outlet and air supply:
58.5
The total resistance is less than 200 Pa.
This flue gas/ air supply system is functional.
NOTE: ECO specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values
CB 155
Summary of Contents for CB 105 HW
Page 69: ...E93 1803 901 HW 70 12 6 Electrical schematic...
Page 70: ...E93 1803 901 HW 71...
Page 71: ...E93 1803 901 HW 72 12 7 Ladder Logic Diagram LOW MAINS VOLTAGE VOLTAGE...
Page 127: ...E93 1803 901 HW 128 22 SPARE PARTS CB 85 HW CB 105 HW and CB 125 HW exploded view...
Page 128: ...E93 1803 901 HW 129...
Page 129: ...E93 1803 901 HW 130 CB 155 HW exploded view...
Page 130: ...E93 1803 901 HW 131...
Page 145: ......
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