Miele PWM 920 EL DV DD Instructions D'installation page 5

Heater bank information
To avoid damage to the heater bank the following must be observed
during commissioning:
- In order to avoid unnecessary heat variations, ensure that heating is
even (do not allow sudden bursts of steam).
- In order to avoid corrosion, the feed water must be processed. In
particular, when the appliance is not in operation, it is important to
ensure that no air or CO
separator must be installed such that when the system is not oper-
ating, the heater bank is completely emptied. This means that no
condensate may remain in the heater bank. The installation of an in-
verted bucket condensate trap is recommended.
- The heater bank must be protected from aggressive gases.
- The entire heating system must not operate at a higher pressure or
temperature than specified on the data plate.
- All appropriate regulations, standards, and legislation from respon-
sible authorities related to the installation and operation of heating
and ventilation systems (in particular for the operation of the heat
exchanger) must be observed.
Steam valve for high-pressure steam – indirect
Requirements profile:
- Pneumatic or servo-controlled
- Connection to ½" coupling
- Flow coefficient of at least 3 m³/h for water
- Media temperature at least 365°F (185°C)
- Operating voltage 230 V/50–60 Hz
- Closed when de-energized
- Electrical connection for 1/4" (6–7 mm) cable diameter
 There is a risk of injury if the machine is operated without the
complete casing.
Once the machine has been connected, re-install all the housing
parts that were removed.
can enter the system. The condensate
2
en - Installation
5