Weil-McLain 550 MBH Nstallation And Operation Manual page 35

®
SlimFit Series 3
DIRECT EXHAUST — Vertical
4. Maintain clearances as shown in the illustrations in this manual
section. Also maintain the following:
a. Vent must terminate:
At least 12 inches above roof or snow line as shown in
Figure 25.
At least 6 feet from adjacent walls.
No closer than 5 feet below roof overhang.
At least 3 feet above any forced air intake within 10 feet.
No closer than 48 inches below or horizontally from any
door or window or any other gravity air inlet.
b. Do not terminate closer than 4 feet horizontally from any elec-
tric meter, gas meter, regulator, relief valve or other equipment.
5. Where the vent penetrates the roof, the annular space around the
penetration must be permanently sealed using approved materials
to prevent entry of combustion products into the building.
6. Locate terminations so they are not likely to be damaged by foreign
objects, such as stones or balls, or subject to buildup of leaves or
sediment.
7. Do not connect any other appliance to the vent pipe. Do not con-
nect multiple boilers to a common vent pipe.
Prepare roof penetrations
1. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or non-
combustible construction, size the vent pipe hole at least 0.5"
larger than the vent pipe diameter:
7" hole for 6" PP and PVC.
9" hole for 8" PP and PVC.
b. Insert a galvanized metal thimble in the vent pipe hole.
2. Follow all local codes for isolation of vent pipe when passing
through floors, ceilings and roofs.
3. Provide flashing and sealing boots sized for the vent pipe and air
pipe.
Termination and fittings
1. Prepare the vent termination coupling (Figure 25) by inserting a
bird screen. Bird screens are supplied with the boiler. Cut to size if
necessary to fit vent pipe size used.
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
—
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FIRED WATER BOILER
(continued)
DIRECT EXHAUST — Vertical termination
2. The vent piping must terminate in a coupling as shown
in Figure 25.
3. Maintain the required dimensions of the finished ter-
mination piping as shown in Figure 25.
4. Do not extend exposed vent pipe outside of building
more than shown in this document. Condensate could
freeze and block vent pipe.
Multiple vent terminations
1. When terminating multiple SlimFit boilers, terminate
each vent connection as described in this section. Space
terminations as required for best installation practices
and required maintenance.
Boiler Manual
35