Weil-McLain 550 MBH Nstallation And Operation Manual page 34

®
SlimFit Series 3
DIRECT EXHAUST — Vertical
DIRECT EXHAUST vertical termination
DIRECT EXHAUST — Vertical
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 roof penetrations before
installing vent 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 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.
34
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 termination (coupling or elbow).
Maximum piping length
1. Locate the terminations such that the total vent piping from the boiler to
2. Maximum lengths listed in Figure 24 allow for 2 elbows. Additional
Connecting from termination to boiler
1. Install the termination 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 vertical termination
1. Locate the vent termination using the following guidelines:
2. The vent piping must terminate in a coupling as shown in Figure 25,
3. Consider the surroundings when terminating the vent:
-
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 24.
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 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°).
page 35.
a. Position the vent termination where vapors will not damage nearby
shrubs, plants or air conditioning equipment or be objectionable.
b. The flue products will form a noticeable plume as they condense in
cold air. Avoid areas where the plume could obstruct window views.
c. Prevailing winds could cause freezing of condensate and water/ice
buildup where flue products impinge on building surfaces or plants.
d. Avoid possibility of accidental contact of flue products with people
or pets.
e. Do not locate the termination where wind eddies could affect per-
formance or cause recirculation, such as inside building corners,
near adjacent buildings or surfaces, window wells, stairwells, alcoves,
courtyards or other recessed areas.
f. Locate or guard vent to prevent condensate damage to exterior
finishes.
—
Boiler Manual
Feet Elbows ** Feet
100 2 Not allowed
30 2 100
Part number 550-100-168/0516
Elbows **
2