Weil-McLain Ultra Commercial Installation And Start-Up Manual page 34

COMMERCIAL GAS
DIRECT EXHAUST — Sidewall
3. Maintain clearances as shown in the illustrations in this manual
section. Also maintain the following:
a. Vent must terminate:
At least 6 feet from adjacent walls.
No closer than 5 feet below roof overhang.
At lease 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
electric meter, gas meter, regulator, relief valve or other equip-
ment.
4. Because the Ultra-550 and Ultra-750 are Category IV appliances,
the National Fuel Gas Code, ANSI Z223.1, requires that the vent
must not terminate over a public walkway or over an area where
condensate or vapor could create a nuisance or hazard, or could
be detrimental to the operation of regulators, relief valves, or other
equipment.
5. Where the vent pen etrates an outside wall, the annular space
around the penetration must be permanently sealed using ap-
proved materials to prevent entry of combustion products into
the building.
6. Locate termination so it is 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.
Completing the vent piping
1. Install vent penetrations as explained in the following pages before
installing vent piping from the boiler to the terminations.
2. Insert piping from boiler vent connections, then attach exterior
termination piping.
3. Follow instructions beginning on
boiler to termination.
Multiple vent terminations
1. When terminating multiple direct exhaust Ultra boilers, terminate
each vent connection as described in this manual for individual
vents. Space terminations as required for best installation practices
and required maintenance.
Prepare wall 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 0.4"
larger than the vent pipe diameter:
7" hole for 6" PVC
9" hole for 8" PVC
b. Insert a galvanized metal thimble in the vent pipe hole as
shown in Figure 40.
2. Use metal cover plates at wall penetrations.
3. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
4. Seal exterior openings thoroughly with exterior caulk.
34
-
FIRED WATER BOILER
page 46 to complete piping from
— Boiler Manual
(continued)
DIRECT EXHAUST — Sidewall —
termination assembly — all parts by
installer
1 Vent piping
2 Cover plates
3 Galvanized thimble
Termination and fittings
1. Prepare the vent termination elbow (
by inserting a bird screen. Bird screens are supplied
with the boiler, and may have to be trimmed to size for
smaller vents.
2. You can install the vent termination using either of the
configurations shown in Figure 24, page 33.
3. Maintain the required dimensions of the finished termi-
nation piping as shown in Figure 24, page 33.
4. Do not extend exposed vent pipe outside of the building
more than shown in this document. Condensate could
freeze and block vent pipe.
4 Vent elbow
5 Bird screen
Figure 24, page 33)
Part number 550-100-086/0809