Gas Venting Requirements - General; General Gas Venting Information; Engineered Vent System - Weil-McLain 4 Series Manual

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Gas Venting Requirements — General
1

General Gas Venting Information

The 94 boilers operate with positive overfire pressure.
Adjust the damper assembly during burner start-up to
achieve 0 1" W C positive pressure at damper sample
hole See page 51 for more information
2

Engineered Vent System

WARNING
!
Conventional Category I flue pipe should not
be used as it could leak flue gases, carbon
3
monoxide emissions, and acidic condensate
through seams and joints, which can result in
severe personal injury or death.
Table 12 Technical data for sizing engineered vent system
4
Input
Boiler
Model
BTU/hr
1494 4550
5
1594 4900
1694 5250
1794 5600
1894
5950
1994 6300
2094 6650
6
2194 7000
2294 7350
2394 7700
2494 8050
2594
8400
7
*Based on the unit operating at nominal conditions This value can vary based on the installation location and the operating conditions
8
44
Stack / Vent Typical Flue
Flow Rate* Temperature*
CFM °F
1511 365-385
1627 365-385
1743 365-385
1859 365-385
1976 365-385
2092 365-385
2208 365-385
2324 365-385
2440 365-385
2557 365-385
2673 365-385
2789 365-385
sTeam series
94
The vent system for a Category I or III model
94 steam boiler is considered a designed and
engineered vent system This system should
be designed by a professional using accepted
engineering practices in accordance with local
authority having jurisdiction
See Table 12 for technical data for an engineered
vent system Weil-McLain recommends contacting
your preferred vent supplier to provide design
support
Natural Gas Chart
Damper
Assembly Port Category I
Pressure
Inches W C Inches W C
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
0 1 -0 1 to 0
boiler manual
4
Boiler Flue
Category III Collar
Diameter
Inches W C Inches
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
0 to 0 1
20
Vent Connection
and Minimum
Vent Diameter
Inches
18
18
18
20
20
20
20
20
22
22
22
22
550-100-157/0523