Waeco Mobitherm MWH-020/N Instructions De Montage Et De Service page 30

MWH-20-N_60-N_EB_10s.book Seite 30 Montag, 5. Februar 2007 5:57 17
Connecting the water heater
➤ Connect the fresh water system (fig. 5 14, page 5) to a safety valve or
the cold water intake (fig. 5 8, page 5, blue rubber ring).
➤ Make sure the valve is correctly fitted: the arrow must point towards the
blue rubber ring.
Note
I
The valve has four functions:
– Cold water intake connection
– Check valve to prevent hot water entering the fresh water
– Safety valve to prevent excess pressure in the water heater
– Drain valve
We recommend installing a ball valve, so that the water heater can be cut off
from the rest of the system during maintenance.
➤ Install the ball valve (fig. 5 12, page 5) between the fresh water system
and the safety valve on the water heater.
➤ Connect the hot water connection of the water heater (fig. 5 4, page 5,
red rubber ring) to the mixer (fig. 5 2, page 5).
Use a connection (a pipe or hose) which is suitable for the resulting
pressure (max. 7 kg/cm²) and temperature (max. 120 °C).
Caution
a
After mounting the water heater and before making the electrical
connections, open the hot water taps (fig. 5 1, page 5) and start
the pump (fig. 5 13, page 5) of the water system.
Let the water run for a few minutes to allow all air to escape from
the system, so that the heating cartridge of the water heater is com-
pletely surrounded by water. Otherwise there is a risk of the heating
cartridge blowing when the power is switched on.
➤ Make sure all connections are tight.
➤ Attach a hose (fig. 5 9, page 5) to the safety valve and make sure that
excess water drains off to the keelson or somewhere else where water
and steam cannot cause injury or damage.
Pay particular care to the electrical equipment.
➤ Again make sure that the cold water and hot water connections are fitted
correctly, and not to the heat exchanger, which is marked with an engine
symbol.
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Mobitherm