30
6.8 Multiple Boiler Venting Installation
• Multiple boiler application boiler can vent individually
or use common vent pipes.
• If boilers vent individually follow guidelines as
described in
fi
gures 6-1 through 6-7.
• If boilers vent through common vent pipes, as shown
in Figure 6-17, choose common vent pipe per Table 8.
Choose size from Table 9 for pipes between boiler and
common vent pipes.
• Longest individual vent lengths and common vent
length together must be shorter than 100 ft. (30m).
H + L
≤
100 ft (30m) (See
fi
gure 6-17)
• Each boiler must have air
fl
ow check valve to prevent
fl
ue gas back
fl
ow.
• External terminals follow same rule as single boiler
venting as described in Section 6.6 and 6.7
FIGURE 6-17 Mulitple Boilers With Common Venting Pipe
Model
Minimum
Diameter
050
2" (51mm)
075
3" (73mm)
100
3" (73mm)
150
3" (73mm)
200
3" (73mm)
299
3" (73mm)
Table 8 - Minimum Diameter for Individual
Boiler in Common Venting System
Total
Firing
Rate
Minimum
Diameter of
Common vent
pipes if
L< 50 ft (16m)
Minimum
Diameter of
Common vent
pipes if
L>50 ft (16m)
400
4" (101mm)
5" (127mm)
600
5" (127mm)
6" (152mm)
800
1000
6" (152mm)
7" (177mm)
1200
1400
1600
7" (177mm)
8" (203mm)
1800
2000
Table 9 - Common Venting Pipe Diameters
L
H
6 - COMBUSTION AIR AND VENT PIPING
Air Flow
Check Valve
Air Flow
Check Valve
Air Flow
Check Valve
12" (305mm)
Anticipated
Snow Line
Vent
Combustion
Air
Ground Level
Summary of Contents for Olsen OLSSC-299
Page 47: ...47 13 TROUBLE SHOOTING ...
Page 51: ...51 13 TROUBLE SHOOTING ...
Page 53: ...53 13 TROUBLE SHOOTING ...
Page 62: ...62 Supply Water Temperature Sensor Resistance Chart 13 TROUBLE SHOOTING ...
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