User Guide

Part number 550-100-400/0717
86
®
SERIES 4 GAS-FIRED WATER BOILER — Boiler Manual
DIRECT EXHAUST — Sidewall
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TERMINATION
DIRECT EXHAUST — Sidewall
termination — installation
sequence overview
3TEP Install the boiler.
3TEP Determine the proper location for wall
penetration for each termination.
s Prepare wall penetrations before installing
vent piping.
s Finish by attaching external pipe and
fi ttings as shown in the termination in-
structions.
s Support vertical runs on the outside of
the building with brackets as shown in the
termination instructions.
3TEP Install vent piping from boiler to termi-
nation.
s Install a hanger support within 6 inches of
any upturn in the piping.
s Install pipe supports every 5 feet on both
the horizontal and vertical runs.
s Slope horizontal piping downward toward
the boiler at least 1/4 inch per foot.
3TEP Connect the vent piping at the boiler per
instructions in this addendum.
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 boiler
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. 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.
3. Terminate the vent piping with a down-turned elbow as shown in Fig-
ure 98, page 87 . 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 98,
page 87 right side.
a. Apply the confi guration on the left side of Figure 98 unless the
termination would fail to meet minimum clearance to grade or
snow line.
b. Apply the confi guration on the right side of Figure 98 when the
termination needs to be raised higher to meet clearance to grade
or snow line.
c. The vent pipe may run up as high as 4 feet, as shown in Figure 98
right side, with no enclosure. The vent pipe must be secured with
braces, and maintain all required clearances.
d. Space braces no further than 24 inches apart. (See WARNING below
for extremely cold climates.)
e. External venting greater than 4 feet requires an enclosure around
the vent pipe. The vent termination must exit through the enclosure
as shown in Figure 98 , maintaining all required clearances.
Do not exceed the maximum length of the outside vent piping
shown in Figure 98 . 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.