INSTALLATION AND OPERATION INSTRUCTIONS
1-4
VFC 15-150 - VFC 45-225 MODULATING GAS BOILERS
• Seal any unused opening in the common venting system.
• Visually inspect the venting system for proper size and horizontal pitch and
determine there is no blockage or restriction, leakage, corrosion and other
deciencieswhichcouldcauseanunsafecondition.
• Insofar as is practical, close all building doors and windows and all doors
between the space in which the appliances remaining connected to the
common venting system are located and other spaces of the building. Turn
on clothes dryers and any appliance not connected to the common venting
system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer
exhaustfan.Closereplacedampers.
• Place in operation the appliance being inspected. Follow the lighting
instructions. Adjust thermostat so appliance will operate continuously.
• 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,exhaustfans,replacedampersandanyothergas-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 VFC-series boilers are approved with alternative venting options: either 2-pipe
DirectVentorsinglepipe/IndoorAirventingcanbeusedofferingexibilityto
meetthespecicrequirementsoftheinstallation.WiththeDirectVentcase,
combustion air is piped directly to the boiler’s air intake from outdoors (see
Section 1.4 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
Use Polypropylene (PPs) or CPVC vent systems approved under ULC-S636
Standard for Type BH Gas Venting Systems, or stainless steel Type BH venting
systems.PermittedPPsmaterialscompriseSingleWallRigidpipeandttings
and Flexible.
• ULC-S636 CPVC: 90°C (194°F)
• ULC-S636 PPs: 110°C (230°F)
Inthestandardconguration,VFCseriesboilerscansupplywatertemperatures
up to 190°F, leaving stack temperatures above the 65°C (149°F) limit for
ULC-S636 approved PVC.