Weil-McLain 550 MBH Nstallation And Operation Manual page 42

®
SlimFit Series 3
DIRECT VENT — Vertical
DIRECT VENT — Vertical
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 roof penetrations before
installing vent and air piping.
Finish by attaching external pipe and
fittings 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 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.
42
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 37 allow for 2 elbows. Additional
Connecting from termination to boiler
1. Install the terminations as instructed in the following. Then proceed to
SF-550
SF-750
— Install required
*
** For piping using more than 2 elbows, reduce maximum allowable length by 7 feet for
Determine location for vertical terminations
1. Locate the vent/air terminations using the following guidelines:
2. The air piping must terminate in a down-turned 180-degree return
3. The vent piping must terminate in an up-turned coupling as shown in
4. Consider the surroundings when terminating the vent and air:
-
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 37.
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 vertical
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°).
bend as shown in Figure 38, page 43. Locate the air inlet pipe no further
than 2 feet from the center of the vent pipe. This placement avoids
recirculation of flue products into the combustion air stream.
Figure 38, page 43. The top of the coupling must be at least 1 foot above
the air intake. The air inlet pipe and vent pipe can be located in any
desired position on the roof, but must always be no further than 2 feet
apart and with the vent termination at least 1 foot above the air intake.
a. Position the vent termination where vapors will not damage nearby
shrubs, plants or air conditioning equipment or be objectionable.
—
Boiler Manual
Feet Elbows ** Feet
100 2 Not allowed
30 2 100
Part number 550-100-168/0516
Elbows **
2