Weil-McLain Aqua Balance WMB-155 Manual page 24

W
TM
AquaBalance
10 DIRECT VENT — Sidewall with separate pipes
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
as shown in Figure 27.
c. Plate may be field fabricated from corrosion resistant
material of sufficient strength. Plate must allow venting
to maintain minimum clearance to combustibles.
Ensure that the plate material is strong enough to
prevent the termination from being pushed inward
if struck or pushed from the outside.
1. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
2. Seal exterior openings thoroughly with exterior caulk.
Termination and fittings
1. Prepare the vent termination elbow and the air ter-
m i n a t i o n e l b o w b y i n s e r t i n g b i r d s c r e e n s .
(See Figure 25, page 23.) Bird screens must be purchased
separately. See the parts list at the end of this manual for
part numbers.
2. Secure the elbows so they will butt against the sidewall ter-
mination plate.
3. When completed, the air termination coupling must be
oriented at least 12 inches below the vent termination and
at least 12 inches above grade or snow line as shown in Fig-
ure 25, page 23.
Keep vents/air intake area clear of accumulating
snow.
4. You can orient the vent termination elbow either directly
outward or 90 degrees away from the air inlet elbow as shown
in Figure 25, page 23.
5. Maintain the required dimensions of the finished termination
piping as shown in Figure 25, page 23.
6. For multiple boiler terminations, see Figure 26.
7. Do not extend exposed vent pipe outside of building more
than shown in this document. Condensate could freeze and
block vent pipe.
If extending the vent and air pipes out from the wall,
install a coupling on each pipe. Mount the piping
with the coupling flush with the outer plate.
Wall penetration thickness between 2" to 24".
24
M -
ALL OUNT GAS FIRED WATER BOILER
See notices on previous page.
—
Boiler Manual
Figure 26
Multiple separate pipes sidewall terminations —
maintain vertical spacing between vent and air
fittings shown in Figure 25, page 23.
Figure 27 Sidewall termination assembly — using
separate pipes
1 Vent piping
2 Air piping
3 Sidewall termination plates: for 3" PVC
or 3" AL29-4C or 2" PVC, (field supplied)
4 Galvanized thimbles, by installer
continued
5 Bird screen, by installer
6 Air inlet elbow
7 Elbow
8 Nipple
9 Vent termination elbow
Part number 550-100-305/0118