Oil Venting System - Weil-McLain 4 Series Manual

insTallaTion
Oil Venting Requirements, continued
1

Oil Venting System

Positive pressure venting:
Boiler, breeching and vent operate at positive
pressure The entire engineered vent system must
be rated for positive pressure venting Ensure 0 1"
2
positive pressure at test opening The minimum
vent height is 3 feet above roof or snow line, and in
accordance to local codes that have jurisdiction See
Figure 38
Natural draft or negative pressure venting:
3
Boiler operates with positive pressure overfire.
Chimney may provide excess draft, which may
require the installation of a draft control device to
minimize draft in accordance to local codes that have
jurisdiction The control must be set to maintain 0 1"
positive pressure at the flue collar. The minimum
4
vent height is 3 feet above roof or snow line, and in
accordance to local codes that have jurisdiction See
Figure 39 and Figure 40
Figure 39 Negative draft / negative pressure venting, single
5
boiler (typical shown)
6
7
8
230045
48
sTeam series
94
Figure 38 Positive pressure venting, single boiler (typical
shown)
230044
Figure 40 Negative draft / negative pressure venting,
multiple boilers (typical shown)
boiler manual
4
15 feet
typical
550-100-157/0523
230046