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44 | Installation
Installations Fig. 35 Stainless steel wall termination
2" PIPE
Maximum effective vent pipe length allowed for
KBR16-3
KBR21-3
Number of 90°
KBR28-3
elbows used
KWB28-3
1
76 ft (23.1 m)
2
71 ft (21.6 m)
3
66 ft (20.1 m)
4
61 ft (18.6 m)
5
56 ft (17.1 m)
6
51 ft (15.6 m)
Table 12 Vent and combustion air pipe lengths with 2" diameter and the
stainless steel wall termination
Installations Fig. 38 Concentric termination
2" PIPE
Maximum effective vent pipe length allowed for
KBR16-3
KBR21-3
Number of 90°
KBR28-3
elbows used
KWB28-3
1
66 ft (20.1 m)
2
61 ft (18.6 m)
3
56 ft (17.1 m)
4
51 ft (15.6 m)
5
46 ft (14.1 m)
6
41 ft (12.5 m)
Table 13 Vent and combustion air pipe lengths with 2" diameter and the
concentric termination
Ø 3" / Ø 5" (Ø 80/125 mm) Concentric venting system
The maximum concentric pipe length ( tab. 14) depends on the
installation situation, the appliance type and the number of elbows used.
Installations Fig. 41
Ø 3" / Ø 5"
(Ø 80/125 mm)
CONCENTRIC
Maximum straight vent pipe length allowed for
PIPE
Ø 3" / Ø 5" (Ø 80/125 mm) concentric pipe
KBR16-3
KBR21-3
Number of 90°
KBR28-3
elbows used
KWB28-3
1
50 ft (15.2 m)
2
44 ft (13.4 m)
3
38 ft (11.6 m)
4
32 ft (9.8 m)
5
26 ft (7.9 m)
6
20 ft (6.1 m)
Table 14 Pipe lengths with Ø 3" / Ø 5" (Ø 80/125 mm) diameter and
termination
6 720 810 590 (2015/05)
Ø 2" pipe
KBR35-3
KWB35-3
KBR42-3
KWB42-3
60 ft (18.3 m)
52 ft (15.9 m)
43 ft (13.1 m)
35 ft (10.7 m)
27 ft (8.2 m)
18 ft (5.5 m)
Ø 2" pipe
KBR35-3
KWB35-3
KBR42-3
KWB42-3
47 ft (14.3 m)
38 ft (11.6 m)
30 ft (9.1 m)
22 ft (6.7 m)
13 ft (4.0 m)
5 ft (1.5 m)
KBR35-3
KWB35-3
KBR42-3
KWB42-3
44 ft (13.4 m)
38 ft (11.6 m)
32 ft (9.8 m)
26 ft (7.9 m)
20 ft (6.1 m)
14 ft (4.3 m)
Fitting
45° elbow
90° elbow
Table 15 Concentric pipe friction loss equivalent for fittings
Example:
• Model: KBR28-3A
• 90° elbows used: 2
• 45° elbows used: 2
Maximum straight vent pipe allowed: 38ft (11.6 m)
6.9
Testing gas and water connections for leaks
NOTICE: System damage!
Pressure, control and safety equipment may be
damaged by excessive pressure.
▶ When you carry out a leakage test, make sure that no
pressure, control or safety equipment is installed
that cannot be isolated from the test pressure.
▶ The boiler and its dedicated shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 14" W.C. (35 mbar).
Water connections
▶ Open the heating supply and return valves and fill the heating system.
▶ Check all connections for leakage (test pressure: Max. 30 psi (2.07
bar) on the pressure gauge).
Gas line
▶ Close the gas shutoff valve to protect the gas valve from damage.
▶ Check all connections for leakage (test pressure: Max. 60" W.C.
(150 mbar)).
▶ Release pressure.
Equivalent
ft
m
3
0.91
6
1.82
Greenstar FS
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