Install Instructions (Venting)

Part number 550-100-103/1110
A–25
GAS-FIRED WATER BOILER — Manual addendum — Venting
DIRECT EXHAUST — Vertical
DIRECT EXHAUST vertical terminationFigure 30
DIRECT EXHAUST — Vertical
termination — installation
sequence overview
Install the boiler.Step 1
Determine the proper location for wall pen-Step 2
etration for each termination.
Prepare roof penetrations before installing s
vent piping.
Finish by attaching external pipe and s
fittings as shown in the termination in-
structions.
Install terminations as described in this s
manual.
Support vertical runs on the outside of s
the building with brackets as shown in the
termination instructions.
Install vent piping from boiler to termina-Step 3
tion.
Install a hanger support within 6 inches of s
any upturn in the piping.
Install pipe supports every 5 feet on both s
the horizontal and vertical runs.
Slope horizontal piping downward toward s
the boiler at least 1/4 inch per foot.
Connect the vent piping at the boiler per Step 4
manual instructions.
Allowable vent pipe materials
Use only the materials listed in 1. Figure 5, page A-7.
Install a bird screen in each vent pipe termination (coupling or elbow). 2.
Bird screens are not supplied with the Ultra boiler. Purchase separately
from Weil-McLain.
Maximum piping length
Locate the termination such that the total vent piping from the boiler 1.
to the termination will not exceed the maximum length given in Fig-
ure 4, page A-6.
Maximum lengths listed in 2. Figure 4, page A-6 allow for 2 elbows. Ad-
ditional elbows require a reduction in maximum length as explained
in the table notes.
Determine location for vertical termination
Locate the vent termination using the following guidelines:1.
The vent piping must terminate in a coupling as shown in 2. Figure 31,
page 26.
Consider the surroundings when terminating the vent:3.
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 termination where wind eddies could affect per-e.
formance or cause recirculation, such as inside building corners,
near adjacent buildings or surfaces, window wells, stairwells, alcoves,
courtyards or other recessed areas.
Locate or guard vent to prevent condensate damage to exterior f.
finishes.
Maintain clearances as shown in the illustrations in this manual section. 4.
Also maintain the following:
Vent must terminate:a.
At least 12 inches above roof or snow line as shown in s Fig-
ure 31.
At least 6 feet from adjacent walls.s
No closer than 5 feet below roof overhang.s
At lease 3 feet above any forced air intake within 10 feet.s
No closer than 48 inches below or horizontally from any door s
or window or any other gravity air inlet.
Do not terminate closer than 4 feet horizontally from any electric b.
meter, gas meter, regulator, relief valve or other equipment.
Where the vent pen5. etrates the roof, the annular space around the
penetration must be permanently sealed using approved materials to
prevent entry of combustion products into the building.
Locate terminations so they are not likely to be damaged by foreign 6.
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 7.
multiple boilers to a common vent pipe.