Direct Venting (Two Pipe System) - Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual

Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service

Direct Venting (Two Pipe System)

Stainless steel or
plastic mesh
Min. 36 in.
(915 mm)
o
Intake terminal 90
Min. 2 in. (50 mm)
Max. 36 in. (915 mm)
Support bracket
Side wall
* Field fabricated vent riser
Min. 12 in.
(305 mm)
Exhaust vent
o
terminal 45
Grade or max.
snow level
Vent
Min. 12 in.
(305 mm)
Air
Min. 2 in. (50 mm)
Termination elbow
with screen
Max. 36 in.
Vent
(915 mm)
*
Min. 12 in.
(305 mm)
Caulk
Grade or max.
snow level
Side wall vent termination [stainless steel, CPVC or PP(s)]
IMPORTANT
The exhaust vent/air intake system must terminate so that
proper clearances are maintained as cited in local codes
or the latest edition of the "Natural Gas and Propane
Installation Code" CAN/CSA-B149.1 (Canada), or the
"National Fuel Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.).
IMPORTANT
For PP(s) systems, all exhaust vent and air intake piping
and elbows exposed outside, must be UV resistant
polypropylene (supplied by the vent manufacturer).
WARNING
Vent termination must be at least 12 in. (305 mm) above
the anticipated snow level (consult your local building
authorities or local weather office). Locate vent termination
in such a way that it cannot be blocked by snow.
Combustion Air Intake Filter (field supplied)
A combustion air inlet filter may be installed at any point
in the combustion air inlet ducting (field supplied).
Sized for 16" X 25" X 1" high performance furnace filter
acceptable filters include 3M 1000, 1500, or 1900 series
filters or equivalent. Ensure location of installation allows
for adequate services clearance for filter inspection and
maintenance.
Refer to filter manufactures instructions for cleaning
replacement intervals, filter care, etc.
Do not decrease the combustion air intake diameter, the
diameter must be maintained through the combustion air
intake ducting.
Using combustion air filters remove dust particles from
supplied combustion air. It is the responsibility of installing
contractor/designer or engineer to make sure any impurities
contain in combustion air supply to the boiler, that can affect
the operation or life expectancy of the components, are
removed and dealt with.
Note: The boiler combustion air inlet connection is not
designed to support the weight of the combustion
air ducting, filter or filter housing ensure that the
combustion air ducting is properly supported.
Venting
65