Venting - Weil-McLain Gold CGi Series 2 User Manual

GOLD
3a
Venting —
CGi venting methods
The CGi boiler can be vented using one of the following
methods:
1.
Chimney draft venting
provided by a vertical vent or chimney. Category I
appliance (non-positive vent static pressure and
vent gas temperature that avoids excessive
condensate production in vent). See section
below. Chimney draft installations use:
a. Vent connector (single or doublewall) sized to
eliminate positive pressure in vent system.
Diameter increases immediately at boiler.
b. Doublewall metal vent (B-vent) or chimney
3b
Venting —
Boiler
Table 3
model
Vent
number
connector
diameter CGi-25 & CGi-3
CGi-4 to CGi-8
Figure 7
Chimney
draft venting
14
CGi Series 2 Gas-Fired Water Boiler
general information
— Uses the natural draft
chimney draft venting
"D" Minimum
vent connector
diameter
4"
5"
Chimney
Increaser
Tight
seal
0322-057
1/4" Rise/4 FT.
D
D
MODEL
CGi
Cleanout
71008
with liner approved by the National Fuel Gas
Code, ANSI Z223.1–latest edition, or in Canada
B149.1 or B149.2 Installation Code.
2.
Direct exhaust — vertical or sidewall
inside combustion air with no combustion air
connector piping. All CGi flue gas vents are
pressurized, requiring careful sealing of all joints.
Category III appliance (positive vent static pressure
, and vent gas temperature that avoids excessive
3b
condensate production in vent). See pages 15-19.
Direct exhaust installations use:
a. Vent pipe specified in this manual.
b. Vent termination through outside wall, roof or
unused chimney. Tight chimney areas will make
vent joint construction very difficult.
Inspect existing chimney before installing boiler.
Failure to clean or replace perforate pipe or lining will
cause severe personal injury or death.
Vent sizing given in
Table 3
The vent connector and chimney must be designed,
sized and constructed in compliance with all applicable
codes. Failure to correctly size and install the vent
system could result in severe personal injury, death or
substantial property damage.
1. Use doublewall metal vent (B-vent) or chimney with liner
as required by the National Fuel Gas Code, ANSI Z223.1–
latest edition, or in Canada, B149.1 or B149.2 Installation
Code.
2. To prevent downdrafts, chimney should extend at least 3
feet above the highest point where it passes through a roof
and at least 2 feet higher than any portion of a building
within a horizontal distance of 10 feet.
3. To vent with another appliance, see National Fuel Gas Code,
ANSI Z223.1–latest edition or in Canada B149.2 or B149.2
Installation Code
4. Do not connect breeching to any portion of a mechanical
draft system that can operate under positive pressure.
5. Maintain minimum 2" clearance from combustible
materials to vent pipe.
6. Do not use chimney with an open fireplace.
7. Make horizontal runs as short as possible. Long runs can
cause condensation.
8. When longer runs are used, support pipe with appropriate
hangers.
9. To prevent blockage, do not vent into bottom of chimney.
10. Vent pipe must not go beyond inside wall of chimney.
11. Vent passing through floors or ceilings must be firestopped.
12. See and to connect boiler to venting system.
Figure 7 Table 3
— Uses
is only a general guideline.
Part Number 550-110-710/0200