Weil-McLain CGI-4E manual 3a Venting — general information, Venting - chimney draft venting

GOLD CGi-4E Gas-Fired Water Boiler — Boiler Manual

3a Venting — general information

CGi-4E venting methods — Chimney draft or Direct exhaust

Chimney draft venting

Chimney draft venting uses the natural draft provided by a ver- tical vent or chimney. Category I appliance (non-positive vent static pressure and vent gas temperature that avoids excessive condensate production in vent). See Section 3b. Chimney draft installations use:

1.Vent connector (single or doublewall) sized to eliminate posi- tive pressure in vent system. Diameter increases immediately at boiler.

2.Doublewall metal vent (B-vent) or chimney with liner ap- proved by the National Fuel Gas Code, ANSI Z223.1–latest edition, or in Canada B149.1 or B149.2 Installation Code.

Direct exhaust — vertical or sidewall

Direct exhaust venting uses inside combustion air with no com- bustion air connector piping. The CGi-4E flue gas vent is pressur- ized, requiring careful sealing of all joints. Category III appliance

(positive vent static pressure and vent gas temperature that avoids excessive condensate production in vent). See pages 15-19.

Direct exhaust installations use:

1.Vent pipe specified in this manual.

2.Vent termination through outside wall, roof or unused chim- ney. Tight chimney areas will make vent joint construction very difficult.

3b

Venting — chimney draft venting

Table 3

Vent connector diameter

Figure 7

Chimnney

draft

venting

Boiler	“D” Minimum
model	vent connector
number	diameter
CGi-4E	5”

Inspect existing chimney before installing boiler. Failure to clean or replace perforated pipe or lining will cause severe personal injury or death.

Vent sizing given in Table 3 is only a general guideline. 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 fire- stopped.

12.See Figure 7 and Table 3 to connect boiler to venting sys- tem.

14 Part Number 550-110-711/1108