Weil-McLain 550 MBH Nstallation And Operation Manual page 31

®
SlimFit Series 3
DIRECT EXHAUST — Sidewall
DIRECT EXHAUST — Sidewall
termination — 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 piping.
Finish by attaching external pipe and
fittings as shown in the termination
instructions.
Support vertical runs on the outside
of the building with brackets as
shown in the termination instruc-
tions.
Install vent piping from boiler to termi-
nation.
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 piping at the boiler
per manual instructions.
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
Allowable vent pipe materials
1. Use only the materials listed in Figure 13, page 23.
2. Install a bird screen in each vent pipe termination (coupling or elbow).
Maximum piping length
1. Locate the termination such that the total vent piping from the boiler to
2. Maximum lengths listed in Figure 19 allow for 2 elbows. Additional
Connecting from termination to boiler
1. Install the terminations as instructed in the following. Then proceed
SF-550
SF-750
*
— Install required
** For piping using more than 2 elbows, reduce maximum allowable length by 7 feet for
Determine location for sidewall termination
Place the vent terminations using the following guidelines.
1. Terminate the vent piping with a coupling as shown in Figure 18,
-
FIRED WATER BOILER
Bird screens are supplied with the boiler. Cut to size if necessary to fit
vent pipe size used.
the termination will not exceed the maximum length given in Figure 19.
elbows require a reduction in maximum length as explained in the
table notes.
to page 45 to complete the vent piping between the termination and
the boiler.
Maximum piping lengths for DIRECT EXHAUST 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°). ADD 14 feet to maximum allowable length if the
sidewall termination uses a coupling instead of two elbows.
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.
page 32. The coupling must butt against the outside wall plate. If vent
piping is extended outside, install a coupling at the outer plate and
continue vent piping from the coupling (or elbow when snorkeling as
in Figure 18, page 32 right side).
a. Apply the configuration on the left side of Figure 18 unless the
termination would fail to meet minimum clearance to grade or
snow line.
b. Apply the configuration on the right side of Figure 18 when the
termination needs to be raised higher to meet clearance to grade
or snow line.
—
Boiler Manual
Feet Elbows ** Feet
100 2 Not allowed
30 2 100
Elbows **
2
31