IBC SL 28-160 Installation And Operating Instructions Manual page 10

WARNING
Do not mix venting materials
from different Manufacturers.
These venting materials are
designed to be installed as
part of a complete system.
Failure to comply may result
in severe personal injury or
death.
WARNING
Fully insert the approved
venting material into the boilers
exhaust outlet and tighten
clamp to ensure the venting
connection is locked in place.
1-6
SL 28-160 MODULATING GAS BOILER
by the respective PPs manufacturers Centrotherm / InnoflueTM (their part
# ISAA0303), M&G Dura Vent /PolyPro (#3PPS-AD) or Z-Flex/Z-DENS
(#2ZDCPVCG3). For 2" venting, use Innoflue part # ISRD0302, PolyPro #
3PPS-R2 (within the PPs piping, after adapting with #3PPS-AD) or Z-DENS
#2ZDR32 (within the PPs piping, after adapting with #2ZDCPVCG3). For
PPs material exposed to outdoor weather, follow the venting suppliers'
recommendations on UV protection.
Combustion air piping - if used - is inserted directly into the 3" female stainless
steel fitting on the right (see Section 1.4.7).
Venting shall be supported in accordance with applicable code.
*Manufacturers of stainless steel Type BH venting systems must submit
their approved transition fitting to IBC for evaluation and written approval.
1.4.3 Vent Travel
CPVC or PPs (Rigid Single Wall) piping is the standard venting option; with this,
the SL 28-160 boiler, for example, can be sited up to 35 equivalent feet from the
vent termination using 2" or up to 170' using 3". The actual vent travel allowance
is reduced for fittings in accordance with Table 3. – e.g. for an SL 28-160 using 6
x 90º CPVC elbows, the maximum lineal measure of pipe allowed using 3" pipe is
122 feet (170' – (6 x 8' = 48) = 122').
For 3" flexible PPs, up to 98 actual lineal feet are allowed in a nominally vertical
orientation (>45°). The equivalent length of 3" flex PPs shall be computed
using a multiple of 2:1, eg. 45' x 2 = 90' equivalent. With 45' of 3" flex, up to 116'
equivalent of 3" rigid PPs would still be allowed. 2" flexible PPs is not allowed.
EXHAUST PIPE SIZE
Sched.40; Rigid PPs
2"
3"
90° long sweep elbow
90° vent elbow
45° elbow
PPs 87-90° elbows
3" Stainless Sidewall Terminal
IBC P/N 180-149
Flexible PPs
3" Flexible
Table 3: Maximum exhaust venting length.
Note: Unused intake travel cannot be added to the exhaust. Unequal intake
and exhaust piping is allowed (see Section 1.4.8).
Exhaust venting must slope down towards the boiler with a pitch of at least 1/4"
per foot (PPs vent: follow PPs manufacturer requirements) so condensate runs
back towards the trap. Support should be provided for intake and vent piping,
particularly so for horizontal runs (follow local code). Insulate exhaust piping
where it passes through unheated spaces or underground, with appropriate pipe
insulation to prevent freezing of condensates.
Certain installations of the 28-160 model can employ the 2" vent options. We
caution installers when using horizontal runs of 2" pipe. Reason: air friction from the
MAXIMUM EQUIVALENT LENGTH
35'
170'
allow 5' equivalent
allow 8' equivalent
allow 3' equivalent
use 8' equivalent
allow 20' equivalent of 3" Sched. 40
98' (max.) actual lineal x 2 = equivalent
INSTALLATION AND OPERATION INSTRUCTIONS