Install Instructions (Venting)

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–22
DIRECT EXHAUST — Sidewall
DIRECT EXHAUST — Sidewall Figure 25
termination
DIRECT EXHAUST — Sidewall
termination — installation
sequence overview
Install the boiler.Step 1
Determine the proper location for wall pen-Step 2
etration for each termination.
Prepare wall penetrations before installing s
vent piping.
Finish by attaching external pipe and s
fittings as shown in the termination in-
structions.
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
instructions in this addendum.
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 sidewall termination
A gas vent extending through an exterior wall shall not
terminate adjacent to the wall or below building extensions
such as eaves, parapets, balconies or decks, except as otherwise
instructed in this manual or local codes. Failure to comply
could result in severe personal injury, death or substantial
property damage.
Place the vent terminations using the following guidelines.
Terminate the vent piping with a down-turned elbow as shown in 3. Fig-
ure 26, page 23. The elbow must butt against the outside wall plate. If
vent piping is extended outside, install an elbow at the outer plate and
continue vent piping from the elbow when snorkeling as in Figure 26,
page 23 right side.
Apply the configuration on the left side of a. Figure 26 unless the
termination would fail to meet minimum clearance to grade or
snow line.
Apply the configuration on the right side of b. Figure 26 when the
termination needs to be raised higher to meet clearance to grade
or snow line.
The vent pipe may run up as high as 4 feet, as shown in c. Figure 26
right side, with no enclosure. The vent pipe must be secured with
braces, and maintain all required clearances.
Space braces no further than 24 inches apart. (See WARNING below d.
for extremely cold climates.)
External venting greater than 4 feet requires an enclosure around e.
the vent pipe. The vent termination must exit through the enclosure
as shown in Figure 26, maintaining all required clearances.
Do not exceed the maximum length of the outside vent piping
shown in Figure 26. Excessive length exposed to the outside
could cause freezing of condensate in the vent pipe, result-
ing in potential boiler shutdown. In extremely cold climates,
install an insulated chase around the vent piping, particularly
when using longer lengths. The chase must allow for inspec-
tion of the vent pipe, and insulation must be protected from
water.