IBC VFC 15-150 Installation And Operating Instructions Manual page 13

WARNING
Fill trap with water before
boiler is first fired to prevent
exhaust fumes from entering
room. Never operate the
boiler unless the trap is filled
with water.
Fan control harness plug
Unplugging fan control harness plug
will drive the fan into manual high
speed operation for vent leak test
BEST PRACTICES
To reduce the possibility of
expansion noise, allow a 1/4"
gap around the exhaust and
air intake piping.
INSTALLATION
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
Exhaust venting must slope down to the trap/drain with a pitch of at least 1/4" per
foot (PPs vent: follow PPs manufacturer requirements for slope) so condensate
runs 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.
Figure 2a: Basic exhaust vent assembly
Ensure all venting components are clean of burrs/debris prior to assembly.
Care is to be taken to avoid ingestion into the fan of PVC/ABS debris left in the
combustion air piping.
All joints must be secured. For CPVC in Canada, use ULC-S636 approved CPVC
solvent cement, in accordance with its manufacturer instructions. Follow the
cement manufacturer's instructions closely when joining various components.For
PPs, connections shall be secured using approved retainer clips supplied by the
respective PPs manufacturer.
All vent connections must be liquid and pressure tight. Prior to firing the boiler,
and before any of the venting run is concealed by the building construction, the
installer must test the exhaust joints under fan pressure with the vent blocked,
using a soap/water solution. Installer must fill condensate trap prior to test.
Remove the fan control harness plug as illustrated in the photos, and then block
the vent outlet so that the vent run will be under maximum fan pressure. Paint all
joints with an approved leak test solution just as you would joints in a gas line,
and make sure there are no leaks. Good practice would suggest that the installer
attach a tag on the vent line near the condensate drain tee indicating the type of
test, the date and the installer's name.
Figure 2b: Basic exhaust vent assembly
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