Main components
Replacement of immersion heater
1 Set the switch (SF1) to
stand by mode and wait ap-
prox. 30 secs
2 Turn off the power supply
to the heat pump.
3 Close the shut-off valves to
the heating system and heat
pump.
4 Drain the water by open-
ing the drain valve (QM1)
and allow air to enter via the
vents (QM20) until the level
is below the reversing valve
(QN10).
NIBE™ VVM 500Chapter 7 | Component replacement34
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