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Direct Venting (Two-pipe System)
General Installation Information
Installation steps (outline)
Exhaust and combustion air piping
material
Use only the materials listed in table
30. entitled "Approved materials for
two-pipe system" on page 41 for
exhaust, combustion air intake pipe
and fittings.
H Cut the pipe end square and remove
all burrs and debris from joints and
fittings.
H If using CPVC special vent material
for exhaust vent pipe and
ABS/PVC/CPVC for combustion air
intake pipe, all joints must be properly
cleaned, primed and cemented. Use
only cement and primer approved for
the use with the pipe material. See
table 30. entitled "Approved
materials for two-pipe system" on
page 41 for approved solvent cement
material.
CAUTION
For solvent cement and primer:
H H H H Use only in well ventilated areas
H H H H Do not use near flame or open fire
H H H H Use only the solvent cement and
primer appropriate for the venting
material being used
H H H H Solvent cements for plastic pipe are
flammable liquids and must be kept
away from all sources of ignition
H No low point is allowed in the
exhaust vent pipe system, unless a
proper drain pipe is used to allow
condensate to drain.
40
WARNING
Ensure that the entire venting
system is protected from physical
damage. A damaged venting system
may cause unsafe conditions.
WARNING
The venting system is approved for
indoor installations only.
Do not install the venting system
outdoors.
H Route vent pipe as directly as
possible and with as few bends as
possible to the boiler.
H Condensate must drain from the flue
pipe to the boiler. Ensure a suitable
gradient of at least 3º (approx. 2" per
3.3 ft. / 50 mm per 1 m).
H Use a hacksaw and sheet metal snips
to cut pipes to length (if necessary).
Use a file to smooth rough edges.
Pipe must be round and not bent into
an oval shape.
IMPORTANT
When cutting pipes to length, debur
and clean pipes.
In conjunction with these
instructions, follow the installation
instructions supplied by the special
venting manufacturer.
Viessmann Venting System
Instructions supersede the
instructions supplied by the
manufacturer.
H All piping must be fully supported.
Use pipe hangers at a minimum of
48" / 1219mm intervals to prevent
sagging of the pipe.
H The exhaust vent/air intake pipe and
fittings must be securely supported
by a support system suitable for the
weight and design of the material
employed. Contact your local vent
material supplier for more information
specific to your installation(s).
IMPORTANT
Ensure that the exhaust vent/air intake
pipes are properly supported. The
Vitodens boiler is not designed to
support the weight of the exhaust
vent/air intake pipe system.
H Field supplied increaser fittings
(transition) should always be inserted
in vertical sections of pipe to prevent
accumulation of condensate in the
vent pipe.
H The total equivalent length specified
for a two-pipe system is the total of
the combined length of the exhaust
vent/air intake pipe system. Do not
exceed these maximum lenghts.
H A maximum of five 90° elbows may
be installed in combined length of the
exhaust vent/air intake pipe system
(excluding termination elbows, tees,
hoods and couplings).
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