Viessmann VITODENS 200-W B2HE 85 Installation Instructions Manual page 21

Vitodens 200-W B2HE 85, 120, 150, 199 Installation
Piping Connections
Legend
DS DHW tank heating supply
DR DHW tank heating return
HS Heating system supply
HR Heating system return
BD Boiler drain
BF Boiler fill
GC Gas connection
Note: Install temperature gauge (field supplied) anywhere
in the supply piping near the boiler (not shown).
(continued)
Heating water connections
1. Thoroughly flush heating system (particularly before
connecting the boiler to an existing system).
2. Connect boiler to the heating system.
Note: Use an approved pipe sealant or teflon tape
when connecting the installation fittings.
Max. allowable working pressure (MAWP):
B2HE 85/120 .....................45 psig (3 bar)
B2HE 150/199 ...................60 psig (4 bar)
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
Use a two-hand wrench method when tightening

fittings or piping onto the boiler connectors. Use
one wrench to prevent the boiler pipes from twisting
and the second wrench to tighten the fitting or
piping. Failure to support the boiler connection could
damage the boiler and its internal piping.
All plumbing must meet or exceed all local state and

national plumbing codes.
IMPORTANT
SUPPORT ALL PIPING USING HANGERS. DO NOT support
piping by the boiler or its components.
Use isolation valves to isolate system components.

The B2HE DHW tank heating supply and return ports

must be capped if the DHW tank connection is not
used.
General
A distance of 2 in. (50 mm) from uninsulated hot water
pipes to combustible components must be maintained.
If the pipes are provided with a suitable pipe insulation
of sufficient thickness and insulation, the distance
mentioned above is not necessary (see also local gas
regulations).
Boiler Connections
21