Direct Exhaust - Vertical - Weil-McLain ULTRA299-S4 Manual

S 4
®
ERIES GAS
DIRECT EXHAUST — Vertical
DIRECT EXHAUST vertical termination
DIRECT EXHAUST — Vertical
termination — installation
sequence overview
Install the boiler.
Determine the proper location for wall pen-
etration for each termination.
Prepare roof penetrations before installing vent
piping.
Finish by attaching external pipe and fi ttings as
shown in the termination instructions.
Install terminations as described in this manual.
Support vertical runs on the outside of the
building with brackets as shown in the termina-
tion instructions.
Install vent piping from boiler to termination.
Install a hanger support within 6 inches of any
upturn in the piping.
Install pipe supports every 5 feet on both the
horizontal and vertical runs.
Slope horizontal piping downward toward the
boiler at least 1/4 inch per foot.
Connect the vent piping at the boiler per
manual instructions.
Part number 550-100-400/0717
-
FIRED WATER BOILER
— Boiler Manual
Allowable vent pipe materials
1. Use only the materials listed in Figure 13, page 19 .
2. Install a bird screen in each vent pipe termination (coupling
or elbow). Bird screens are not supplied with the Ultra boiler.
Purchase separately from Weil-McLain.
Maximum piping length
1. Locate the termination such that the total vent piping from the boil-
er to the termination will not exceed the maximum length given in
Figure 12, page 18 .
2. Maximum lengths listed in Figure 12, page 18 allow for 2 elbows.
Additional elbows require a reduction in maximum length as
explained in the table notes.
Determine location for vertical termination
1. Locate the vent termination using the following guidelines:
2. The vent piping must terminate in a coupling as shown in Fig-
ure 103, page 90 .
3. Consider the surroundings when terminating the vent:
a. Position the vent termination where vapors will not damage
nearby shrubs, plants or air conditioning equipment or be
objectionable.
b. The fl ue products will form a noticeable plume as they
condense in cold air. Avoid areas where the plume could
obstruct window views.
c. Prevailing winds could cause freezing of condensate and
water/ice buildup where fl ue products impinge on building
surfaces or plants.
d. Avoid possibility of accidental contact of fl ue products with
people or pets.
e. Do not locate the termination where wind eddies could affect
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
f. Locate or guard vent to prevent condensate damage to ex-
terior fi nishes.
4. Maintain clearances as shown in the illustrations in this manual
section. Also maintain the following:
a. Vent must terminate:
At least 12 inches above roof or snow line as shown in
Figure 103 .
At least 6 feet from adjacent walls.
No closer than 5 feet below roof overhang.
At lease 3 feet above any forced air intake within 10 feet.
No closer than 48 inches below or horizontally from any
door or window or any other gravity air inlet.
b. Do not terminate closer than 4 feet horizontally from any
electric meter, gas meter, regulator, relief valve or other
equipment.
5. Where the vent penetrates the roof, the annular space around the
penetration must be permanently sealed using approved materi-
als to prevent entry of combustion products into the building.
6. Locate terminations so they are not likely to be damaged by
foreign objects, such as stones or balls, or subject to buildup of
leaves or sediment.
7. Do not connect any other appliance to the vent pipe. Do not
connect multiple boilers to a common vent pipe.
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