Install Instructions (Venting)

Part number 550-100-103/1110
A–15
GAS-FIRED WATER BOILER — Manual addendum — Venting
DIRECT VENT: Vertical vent / sidewall air
Determine location
Locate the vent termination using the following guidelines:1.
The vent piping must terminate in an up-turned coupling as shown 2.
in Figure 20, page A-16. The top of the coupling must be at least 1 foot
above the air intake.
You must consider the surroundings when terminating the vent and 3.
air:
Position the vent termination where vapors will not damage nearby a.
shrubs, plants or air conditioning equipment or be objectionable.
The flue products will form a noticeable plume as they condense b.
in cold air. Avoid areas where the plume could obstruct window
views.
Prevailing winds could cause freezing of condensate and water/c.
ice buildup where flue products impinge on building surfaces or
plants.
Avoid possibility of accidental contact of flue products with people d.
or pets.
Do not locate the terminations where wind eddies could affect e.
performance or cause recirculation into building or appliance air
intakes, such as inside building corners, near adjacent buildings
or surfaces, window wells, stairwells, alcoves, courtyards or other
recessed areas.
Do not terminate above any door or window. Condensate can freeze, f.
causing ice formations.
Locate or guard vent to prevent condensate damage to exterior g.
finishes.
Maintain clearances to vent termination as given below:4.
Vent must terminate:a.
At least 6 feet from adjacent walls.s
No closer than 5 feet below roof overhang.s
At least 3 feet above any forced air intake within 10 feet.s
No closer than 12 inches below or horizontally from any door s
or window or any other gravity air inlet.
Do not terminate vent closer than 4 feet horizontally from any b.
electric meter, gas meter, regulator, relief valve or other equip-
ment. Never terminate above or below any of these within 4 feet
horizontally.
Locate terminations so they are not likely to be damaged by foreign 5.
objects, such as stones or balls, or subject to buildup of leaves or sedi-
ment.
Do not connect any other appliance to the vent pipe. Do not connect 6.
multiple boilers to a common vent pipe.
Prepare roof penetrations
Vent pipe penetration:1.
Cut a hole for the vent pipe. For either combustible or noncombus-a.
tible construction, size the vent pipe hole at least 0.4” larger than
the vent pipe diameter:
2¾” hole for 2” PVCs
4” hole for 3” PVCs
5” hole for 4” PVCs
Insert a galvanized metal thimble in the vent pipe hole.b.
Follow all local codes for isolation of vent pipe when passing through 2.
floors, ceilings and roofs.
Provide flashing and sealing boots sized for the vent pipe and air 3.
pipe.
Allowable vent/air pipe materials
Use only the materials listed in 1. Figure 5, page A-7.
Purchase bird screens for vent and air termina-2.
tions separately. See the parts list at the end of this
manual.
Maximum piping lengths
Locate the terminations such that the total air pip-1.
ing and vent piping from the boiler to the termina-
tion will not exceed the maximum length given in
Figure 4, page A-6.
Maximum lengths listed in 2. Figure 4, page A-6 allow
for 1 elbow in the air piping and 1 elbow in the vent
piping. Additional elbows required a reduction in
maximum length as explained in the table notes.
Direct vent: Vertical vent / sidewall airFigure 19