Miele PW 811 Installations Plan page 14

Installation and planning notes
Drain valve
14
A motorised dump valve is used to drain the machine. An HT DN 70
angle connector (not available from Miele) can be used for draining
the machine directly into the waste water system (without a siphon) or
into an on-site gully (with odour trap).
Thanks to an improved closing mechanism and a larger cross-
section, even the coarsest of soiling does not leave any deposits or
debris behind which could result in blockages. The dump valve can
also be operated manually to allow the suds container to be emptied
in the event of a power cut.
A vented drainage system is vital for unimpeded drainage.
If several machines are connected to a single drain pipe, this
should be sufficiently large to allow all machines to drain
simultaneously.
The appropriate Miele installation set M.-No.: 05 238 090 is
available from Miele for venting an HT DN 70 pipe (not available
from Miele).
If the slope for drainage is extremely steep, the piping must be
vented to prevent formation of a vacuum in the machine's drain
system.
Slow or obstructed drainage or a backup of water in the drum as a
result of undersized pipework can result in faults occurring during
programmes, which will result in error messages appearing in the
display.
 Outflowing suds can be as hot as 95 °C. Danger of burning!
Avoid direct contact.
PW 811 / PW 814 / PW 818