6 Disconnect the connec-
tions.
Replacement of reversing valves QN 10 and QN 35
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 part to be re-
placed.
39Chapter 7 | Component replacementNIBE™ VVM 500
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