Install Instructions

&IGURE Terminations for multiple boilers
0REPAREROOFPENETRATIONS
1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as close
as desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or
noncombustible construction, size the vent pipe hole at
least 0.4” larger than the vent pipe diameter.
b. Insert a galvanized metal thimble in the vent pipe hole.
3. Space the air and vent holes to provide the spacings shown
in Figure 34, page 29.
4. Follow all local codes and vent pipe manufacturer’s instruc-
tions for isolation of vent pipe when passing through floors,
ceilings and roofs.
5. Provide flashing and sealing boots sized for the vent pipe and
air pipe. Follow all vent pipe manufacturer’s instructions.
4ERMINATIONANDlTTINGS
1. Prepare the vent termination elbow and the air termination
elbow (Figure 34, page 29) by inserting bird screens. Bird
screens must be purchased separately. See the parts list at the
end of this manual for part numbers.
2. The air piping must terminate in a down-turned 180-degree
return bend as shown in Figure 34, page 29. Locate the air inlet
pipe no further than 12 inches from the center of the vent
pipe. This placement avoids recirculation of flue products
into the combustion air stream.
3. The vent piping must terminate in an up-turned coupling as
shown in Figure 34, page 29. 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 12 inches apart and with the
vent termination at least 1 foot above the air intake.
4. Maintain the required dimensions of the finished termination
piping as shown in Figure 34, page 29.
5. Do not extend exposed vent pipe outside of building more
than shown in this document. Condensate could freeze and
block vent pipe.
 See notices on previous page.
Part number 550-100-131/0715
– 30 –
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GAS-FIRED WATER BOILER — Boiler Manual
DIRECT VENT — Vertical with separate pipes (continued)
Also maintain maximum distances between the
vent and air pipes for each boiler as shown in Fig-
ure 34, page 29