IBC Technologies VFC 160 Installation And Operating Instructions Manual - page 6
IBC Technologies Inc.
- 6 -
VFC 160
Direct Vent case, combustion air is
piped directly to the boiler’s air intake
from outdoors. Using the Category IV
alternative, air for combustion is drawn
from the indoor air surrounding the
boiler or drawn from ventilated attic or
crawl spaces.
The VFC 160 is shipped with a high
water temperature limit switch set for
200°F.
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 (see
below).
All boilers are shipped with connectors
permitting attachment of 2” intake
piping.
It is a code requirement that the
rating plate reflect the nature of the
boiler vent configuration as installed.
To facilitate such venting installation
flexibility, VFC boilers are shipped
with the rating plate unmarked. The
installer shall indelibly mark the
appropriate box on the rating plate to
recognize the venting alternative
chosen.
1.4.1.1 Intake/Exhaust Vent Material
The approved materials of construction:
For the exhaust vent-
• 2" CPVC Sch. 40 or 80 pipe (per
ASTM F441) and Sch. 40 or 80 fittings
for the initial 10 lineal feet of travel
• 2 1/2" or 3" Sch 40 CPVC or PVC, or
3" ABS (Sch. 40/ASTM D2661 or F628)
and fittings thereafter;
For the inlet air - ABS and PVC (ASTM
D1785 or D2665) are permitted.
See Vent Travel- below.
Exhaust venting is to be connected
directly to the 2” NPT male threaded
stainless steel fitting on the bottom of
the pressure vessel using a 2” CPVC
NPT x Socket fitting (female threaded
adaptor or 90° elbow). A condensate
trap of CPVC and PVC shall be spliced
into the CPVC exhaust pipe at or near
the base of the boiler (see Figure 2).
Combustion air piping is connected at
the base of the boiler using a standard 2"
PVC coupler or elbow. Screen material
shall be placed at the inlet termination as
appropriate for the environment (e.g.
insects, dust).
1.4.1.2 Vent Travel
With the specified 2 1/2" or 3” piping
(after 10' of 2" CPVC on the exhaust
side), the boiler can be sited up to 90
equivalent feet from the vent
termination. The actual vent travel is
reduced for fittings in accordance with
Table 3. - for example, using 5 x 90º
long-sweep* ABS elbows, the maximum
lineal measure is 65 feet.
Table 3 - Max. Venting Length
Pipe Size
( * = long sweep)
Max.
Equiv.Length
3” (after 10' of 2")
90’ (incl 1
st
10')
90° elbow(CPVC/PVC)
Allow 8’ equiv.
45° elbow(CPVC/PVC)
Allow 4’ equiv.
90° elbow*(ABS)
Allow 5’ equiv.
45° elbow*(ABS)
Allow 2.5’ equiv.
A 3” x 2” (or 2.5" x 2" as appropriate)
bushing is to be used in the inlet piping
within 3 feet of the combustion air line
clearance hole at the base of the boiler.
The 3’ interval (which is part of the 90’
max. travel distance) is allowed to