Zanussi ZWC 1300W - Manual (Page 21)

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Water drainage
If you intend the drain hose from the machine to
empty into a sink, make sure that the sink is empty
and that the plug hole is not blocked.
If the machine is permanently plumbed in, hook the
end of the hose into a standpipe installed for the
purpose. The standpipe must have an internal dia-
meter of at least 40 mm (1 1/2”) in order that there is
an air gap between the drain hose and the standpipe.
Make sure, that it is designed in such a way, that the
end of the drain hose cannot be covered with water.
Important
Before connecting up the machine to new pipework
or to pipework that has not been used for some time,
run off a reasonable amount of water to flush out
any debris that may have collected in the pipes.
Whether discharging into a sink or a standpipe,
check that the end of the drain hose is neither too
high or too low. The top of the curve in the hose’s
end should be no more than 800 mm (31.5”), and
no less than 650 mm (25.6”) above floor level.
The discharge hose can be extended up to a total
of 3,5 m. For the extension piece use a hose with
an internal diameter at least as large as that of the
machine's own hose. Use a suitable hose
connector.
In order for the machine to function
properly, the drain hose must be hooked
on the factory fitted support piece
situated on top of the back side of the
appliance.