A.O. Smith DURA-Power DRE-52, Инструкция по установке и эксплуатации

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3.1.4 Putting out of operation
Method of working:
1. For short periods: take the connector
out of the stop contact or where
there is a fixed connection switch off
the mains switch.
2. In addition to the operations in
point 1, for longer periods it is
recommended to shut off the water
feed pipe in connection with the
danger of frost and once the device
has cooled down, to drain off the
water by connecting a drainage hose
to the drainage valve and opening
it. Also open the closest hot water
drainage point for ventilating the
tank. Take care that the feed pipe
and inlet combination cannot freeze.
Drain the feed pipe as necessary
and check whether all other pipes
are empty.
3.2 Maintenance
The inlet combination must be allowed to
work regularly (testing with the test button)
with the aim of avoiding a blockage as a
consequence of scale. The water has to
flow out in a forceful jet. Check whether the
discharge pipe is open. We recommend a
service agreement with an installer on an
annual basis.
3.3 Faults
In the case of faults we advise you to
switch off the device by means of the
mains switch and to ask a recognised
installer of technical support for help.