Bosch KWB42-3 User Manual

44 | Installation
Greenstar FS
6 720 810 590 (2015/05)
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.
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
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.
Installations  Fig. 35 Stainless steel wall termination
2" PIPE Maximum effective vent pipe length allowed for
Ø 2" pipe
Number of 90°
elbows used
KBR16-3
KBR21-3
KBR28-3
KWB28-3
KBR35-3
KWB35-3
KBR42-3
KWB42-3
1 76 ft (23.1 m) 60 ft (18.3 m)
2 71 ft (21.6 m) 52 ft (15.9 m)
3 66 ft (20.1 m) 43 ft (13.1 m)
4 61 ft (18.6 m) 35 ft (10.7 m)
5 56 ft (17.1 m) 27 ft (8.2 m)
6 51 ft (15.6 m) 18 ft (5.5 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
Ø 2" pipe
Number of 90°
elbows used
KBR16-3
KBR21-3
KBR28-3
KWB28-3
KBR35-3
KWB35-3
KBR42-3
KWB42-3
1 66 ft (20.1 m) 47 ft (14.3 m)
2 61 ft (18.6 m) 38 ft (11.6 m)
3 56 ft (17.1 m) 30 ft (9.1 m)
4 51 ft (15.6 m) 22 ft (6.7 m)
5 46 ft (14.1 m) 13 ft (4.0 m)
6 41 ft (12.5 m) 5ft (1.5m)
Table 13 Vent and combustion air pipe lengths with 2" diameter and the
concentric termination
Installations  Fig. 41
Ø3" / Ø5"
(Ø 80/125 mm)
CONCENTRIC
PIPE
Maximum straight vent pipe length allowed for
Ø 3" / Ø 5" (Ø 80/125 mm) concentric pipe
Number of 90°
elbows used
KBR16-3
KBR21-3
KBR28-3
KWB28-3
KBR35-3
KWB35-3
KBR42-3
KWB42-3
1 50 ft (15.2 m) 44 ft (13.4 m)
2 44 ft (13.4 m) 38 ft (11.6 m)
3 38 ft (11.6 m) 32 ft (9.8 m)
4 32 ft (9.8 m) 26 ft (7.9 m)
5 26 ft (7.9 m) 20 ft (6.1 m)
6 20 ft (6.1 m) 14 ft (4.3 m)
Table 14 Pipe lengths with Ø 3" / Ø 5" (Ø 80/125 mm) diameter and
termination
Fitting Equivalent
ft m
45° elbow 3 0.91
90° elbow 6 1.82
Table 15 Concentric pipe friction loss equivalent for fittings
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).

Bosch KWB42-3 Specifications

General

Brand	Bosch
Model	KWB42-3
Category	Boiler
Language	English