IBC SL 35-199

1-5
INSTALLATION
SL 35-199, SL 45-260 MODULATING GAS BOILERS
• After it has been determined that each appliance remaining connected to the
common venting system properly vents when tested as outlined above, return
doors,windows,exhaustfans,replacedampersandanyothergas-burning
appliance to their previous conditions of use.
• Any improper operation of the common venting system should be corrected
so the installation conforms with the National Fuel Gas Code, ANSI Z223.1 -
latest edition. In Canada, all installations must conform with the current CAN/
CGA - B149.1-10 Installation Code and/or local codes.
1.4.1 Applications
All SL series boilers are approved with alternative venting options: either 2-pipe
DirectVentorsinglepipe/IndoorAirventingcanbeusedofferingexibilityto
meetthespecicrequirementsoftheinstallation.WiththeDirectVentcase,
combustion air is piped directly to the boiler’s air intake from outdoors (see
Section 1.4.7 for air intake piping requirements). Using the indoor air alternative,
air for combustion is drawn from the indoor air surrounding the boiler.
Provided the maximum overall vent length limit is not exceeded, the installer may
choose to vent the boiler through the wall, directly through the roof or upward
using an existing - but otherwise unused - chimney as a vent raceway.
1.4.2 Exhaust Vent Material
EXHAUST VENT MATERIAL – CANADA
Only CPVC or Polypropylene (PPs) vent component systems approved under
ULC-S636 Standard for Type BH Gas Venting Systems, or stainless steel Type
BH venting systems* are to be used. Permitted PPs materials comprise Single
WallRigidpipeandttingsandFlexible.Ensurecompliancewithexhaust
temperature limitations for the respective materials, which typically are:
• ULC-S636 CPVC: 90°C (194°F)
• ULC-S636 PPs:- 110°C (230°F)
For long vent runs with higher initial exhaust temperature, some jurisdictions may
allow the use of mixed materials for economy: CPVC for the initial run followed by
ULC-S636 approved PVC to the termination (It is the responsibility of the Installer
toconrmthatlocalcodeswillallowthisoption).Ensureappropriatetransition
glueisused.Theinstallerisresponsibletoensurethatsufcienttemperature
loss is allowed for in the CPVC section to fall below the 65°C (149°F ) upper limit
for PVC, taking into account the highest possible ambient temperature in the area
of vent travel (e.g. boiler room, attic and/or chase).
EXHAUST VENT MATERIAL – USA
IBC strongly recommends that only CPVC or PPs vent component systems
approved under UL1738 (Standard for Venting Systems for Gas Burning
Appliances, Categories II, III and IV), ULC-S636 Standard for Type BH Gas
Venting Systems, or stainless steel Type BH venting systems* are to be used,
but many local jurisdictions in the USA still allow the use of PVC (Sch. 40 ASTM
D1785orD2665andttings)orCPVC(Sch.40/ASTMF441withSch.80
ttings);orCSAapproved3”stainlessventsystems.
Do not use ABS or any cellular core pipe for exhaust venting.
WARNING
Covering non-metallic vent
pipe and ttings with thermal
insulation shall be prohibited.