Weil-McLain 550 MBH Nstallation And Operation Manual page 38

®
SlimFit Series 3
DIRECT VENT — Sidewall
DIRECT VENT — Sidewall
termination with separate vent
and air pipes — installation
sequence
adapter at each boiler fitting where stain-
less steel pipe will be connected.
Install the boiler.
Determine the proper location for wall
penetration for each termination.
Prepare wall penetrations before
installing vent and air piping.
Finish by attaching external pipe and
fittings as shown in the termination
instructions.
Install termination assembly as
described in this manual.
Support vertical runs on the outside
of the building with brackets as
shown in the termination instruc-
tions.
Install air and vent piping from boiler
to termination.
Install a hanger support within
6 inches of any upturn in the piping.
Slope horizontal piping downward
toward the boiler at least 1/4 inch
per foot.
Connect the vent and air piping at the
boiler per manual instructions.
38
COMMERCIAL CONDENSING GAS
Allowable vent/air pipe materials
1. Use only the materials listed in Figure 13, page 23.
2. Install a bird screen in each vent and air pipe termination. Bird screens
Maximum piping length
1. Locate the terminations such that the total air piping and vent piping
2. Maximum lengths listed in Figure 29 allow for 2 elbows. Additional
Connecting from termination to boiler
1. Install the terminations as instructed in the following. Then proceed to
— Install required
SF-550
SF-750
*
** For piping using more than 2 elbows, reduce maximum allowable length by 7 feet for
Determine location for termination
1. Place the vent/air terminations using the following guidelines.
2. The vent and air piping must terminate as shown in Figure 30, page 39.
-
FIRED WATER BOILER
are supplied with the boiler. Cut to size if necessary to fit vent pipe
size used.
from the boiler to the termination will not exceed the maximum length
given in Figure 29.
elbows require a reduction in maximum length as explained in the
table notes.
page 45 to complete the air and vent piping between the termination
and the boiler.
Maximum piping lengths for DIRECT VENT sidewall
termination
PP, PVC, CPVC, ABS, AL29-4C SS
Feet Elbows **
30 2
Not allowed
For 4-inch or 6-inch piping, install a pipe reducer directly at the boiler connection,
oriented vertically. Install reducer above the required adapter if using stainless steel
piping.
each additional elbow (90° or 45°).
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.
(The elbow at the exit opening must butt against the outside wall
plate.) This arrangement avoids recirculation of flue products into the
combustion air stream.
a. Apply the configuration on the left side of Figure 30 unless the
terminations would fail to meet minimum clearance to grade or
snow line.
—
Boiler Manual
Feet Elbows ** Feet
100 2 Not allowed
30 2 100
Part number 550-100-168/0516
Elbows **
2