Viessmann VITODENS 100-W Installation And Service Instructions Manual page 35

Installing the boiler and making all connections
Connect safety valve drain
A 718/22 mm
Installation sequence
(cont.)
Connect a suitable discharge pipe to
the pressure relief valve outlet. The
pipe discharging to a safe place must
be a minimum of 15 mm copper and
run continually downwards.
The pipe from the pressure relief
valve must not discharge above an
entrance, window or any type of public
access area.
The pipe must be routed to a position
so that any discharge of water possi-
bly boiling, or steam, cannot create
any danger to persons, damage to
property or external electric compo-
nents and wiring. The point of dis-
charge must be clearly visible.
To ease future servicing it is advisable
to use a compression type fitting to
extend the discharge pipe.
35