Weil-McLain GOLD CGt Manual page 14

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
3a
Venting — general information
CGt venting methods
The CGt 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 — chimney draft venting
Boiler
Table 2
model
Vent
number
connector
diameter
CGt
Figure 7
Chimney
draft venting
14
— Uses the natural draft
"D" Minimum
vent connector
diameter
5"
Chimney
Tight seal
Slope min. 1/4" rise/4 FT.
Increaser, 3" to 5"
5"
Cleanout
071008
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
combustion air with no combustion air connector
piping. All CGt 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 condensate
3b
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 2
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
Figure 7 Table 2
system.
— Uses inside
is only a general guideline.
to connect boiler to venting
Part Number 550-110-290/0501