IBC Technologies VFC 160 Installation And Operating Instructions Manual - page 10
IBC Technologies Inc.
- 10 -
VFC 160
1.4.2 Category IV Venting
A category IV venting system is one in
which air for combustion is take from
the ambient air around the boiler. Vent
piping is run horizontally or vertically to
the outdoors.
1.4.2.1 Ventilation and Air Supply
To support combustion, an ample air
supply is required. This may require
direct openings in the boiler room to the
outside. If the boiler is not in a room
adjacent to an outside wall, air may be
ducted from outside wall openings.
Provisions for combustion and
ventilation air must be made as follows:
in the USA, in accordance with Section
5.3 Air for Combustion and Ventilation
of the National Fuel Gas Code, ANSI
Z223.1 (latest edition), or applicable
provisions of the local building codes; in
Canada, in compliance with CAN 1.4.3.
The following lists are recommendations
for buildings of energy-saving
construction, fully caulked and weather-
stripped:
• an opening to the outside, within 18”
of the floor, but no less than 6” off
the floor, should be provided in the
room. Each opening should be
covered in a grill, and have an area
of 1” per 1,000 BTUh for ALL
APPLIANCES in the area.
• Openings must not be closed or
reduced. Doors and windows used
for air supply must be locked open.
• Mechanical draft exhaust or supply
fans are not to be used in or near the
boiler area
• Boiler combustion and ventilation
airflow must not be obstructed
Indoor combustion air must not expose
the boiler to contamination - see Section
1.3 - Location, above. In other respects,
Category IV venting is installed in the
same manner as for the exhaust side of
Direct Vent installations.
1.4.3 Closet Installations
For installations in a confined space
(such as a closet), ventilation openings
must be provided through a door or wall
to prevent excessive heat from building
up inside the space.
Minimum requirements:
• one opening within 12” of the ceiling
(100 sq. in. opening)
• one opening within 12” of the floor
(100 sq. in. opening)
1.5 Water Piping
Follow applicable Codes and good
piping practice. Any uninsulated hot
water pipes must be installed with a
minimum 1” clearance from combustible
materials.
System piping is connected to the boiler
using the 1” NPT female threaded
fittings provided at the locations shown
on page 10. Typical piping systems are
shown in Figures 8,9, &10.
A 30 psi pressure relief valve (¾” NPT)
is supplied for field installation in the
flow supply line, in the manner shown in
Figures 8,9, & 10. Relief valve
discharge piping must terminate 6”
above a drain using plain un-threaded
end, or per local Code.
To avoid exposure to water damage,
system piping and components are not to
be located overhead the boiler.