Installation Examples - Viessmann Vitodens 200-W Series Installation Instructions Manual

Installation Examples

Please note that in the following piping layout examples all pumps are field supplied.
IMPORTANT
The examples on the following pages
depict possible piping layouts of the
Vitodens 200-W WB2B boiler equipped
with Viessmann System Technology.
For boiler and tank combinations,
please install only feasible
combinations listed in the Viessmann
Price List.
Please note that the following
examples are simplified conceptual
drawings only!
Piping and necessary componentry
must be field verified.
A low water cut-off (LWCO) must be
installed where required by local codes.
Proper installation and functionality in
the field is the responsibility of the
heating contractor.
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General
The schematics on the following pages
are to be seen as guidelines only. They
further do not display all system
varieties, safety devices, or concepts
possible. Specific system layouts may
be further discussed with the local
Viessmann sales representative office.
WARNING
If a DHW storage tank other than a
Viessmann Vitocell 100 or 300 tank
is used, the installer must verify
proper operation of the Viessmann
DHW tank temperature sensor with
the original manufacturer of the tank.
Viessmann strongly recommends the
installation of a temperature
tempering valve in the DHW supply
line.
Clearances
A minimum of 2"/51 mm
circumferential clearance from
non-insulated hot water pipes to
combustible construction must be
maintained. In cases where the pipes
are insulated with pipe insulation of
appropriate and sufficient thickness
and insulation values, the above
clearance may be reduced to 0" (refer
to local gas codes).
CAUTION
For underfloor heating applications,
an additional immersion or strap-on
aquastat must be installed in the low
temperature underfloor loop
(downstream of the mixing valve) to
de-energize the pump and/or boiler to
prevent overheating. High water
temperatures can damage concrete
slabs.
IMPORTANT
DHW supply and return piping between
boiler DHW connections and the
Viessmann DHW tank connections,
shall be a minimum of 1¼" pipe size.
This will ensure the residual head of
the field supplied pump is fully utilized
to overcome the resistance of the DHW
heat exchanger coil and to provide
sufficient water flow to the boiler heat
exchanger.
In non-Viessmann DHW tank
applications, perform, in addition to the
above, accurate calculations for DHW
tank coil pressure drop versus boiler
pump (field supplied) residual head to
ensure sufficient water flow to the
boiler heat exchanger. Failure to heed
the above instructions may cause boiler
short-cycling and inadequate DHW
supply.