Testing Gas And Water Connections For Leaks - Bosch Greenstar combi 100 p Installation And Service Instructions For Contractors

2" (50 mm) Vent and combustion air pipe
The maximum total combined equivalent length of vent and combustion
air pipe ( Tab. 15, 16 and 17) depends on the installation, the
appliance type and number of elbows be used.
Installation  Fig. 25, 26, 27, 29, 30 and 32 separate terminal
ends
2" PIPE Maximum straight vent pipe length
allowed for Ø 2" pipe
Number of 90 ° elbows combi 100 p
used
1 81 ft (24.6 m)
2 76 ft (23.1 m)
3 71 ft (21.6 m)
4 66 ft (20.1 m)
5 61 ft (18.6 m)
6
56 ft (17.1 m)
Table 15 Vent and combustion air pipe lengths with 2" diameter and
separate terminations
Installation  Fig. 28 Stainless steel terminal end, horizontal
2" PIPE Maximum straight vent pipe length
allowed for Ø 2" pipe
Number of 90 ° elbows combi 100 p
used
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 16 Vent and combustion air pipe lengths with 2" diameter and the
stainless steel wall termination
Installation  Fig 31 Concentric terminal end
2" PIPE Maximum straight vent pipe length
allowed for Ø 2" pipe
Number of 90 ° elbows combi 100 p
used
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 17 Vent and combustion air pipe lengths with 2" diameter and the
concentric termination
Greenstar combi 100 p / 151 p
3" / 5" (80/125 mm) Concentric venting system
The maximum length of concentric vent or combustion air pipe
( Tab. 18) depends on the installation, the appliance type and number
of elbows used.
Installation  Fig. 34
Ø 3" / Ø 5" (Ø 80/125 mm)
CONCENTRIC PIPE
combi 151 p Number of 90 ° elbows used combi 100 p
1
65 ft (19.8 m)
2
57 ft (17.3 m)
3
48 ft (14.6 m)
4
40 ft (12.2 m)
5
32 ft (9.8 m)
6
23 ft (7.0 m)
Table 18 Pipe lengths with 3" / 5" (80/125 mm) diameter and
Fitting
45 ° elbow
90 ° elbow
combi 151 p
Table 19 Concentric pipe friction loss equivalent for fittings
Example:
60 ft (18.3 m)
• Model: combi 151 p
52 ft (15.9 m)
• 90 ° elbows used: 2
43 ft (13.1 m)
• 45 ° elbows used: 2
35 ft (10.7 m)
Maximum length of straight pipe: 32 ft (9.8 m)
27 ft (8.2 m)
18 ft (5.5 m)
6.8
NOTICE:
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
combi 151 p 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
47 ft (14.3 m)
system at test pressures in excess of 14" W.C. (35 mbar).
38 ft (11.6 m)
30 ft (9.1 m)
Water connections
22 ft (6.7 m)
▶ Open the heating supply and return valves and fill the heating system.
13 ft (4.0 m)
▶ Check all connections for leakage (test pressure: Max. 30 psi (2.07
5 ft (1.5 m)
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.
Notes on installation and operation | 31
Maximum straight vent pipe length
allowed for Ø 3" / Ø 5" (Ø 80/125
mm) concentric pipe
50 ft (15.2 m)
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)
termination

Testing gas and water connections for leaks

combi 151 p
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)
Equivalent
ft m
3 0.91
6 1.82
6720872361 (2017/04)