Preparations
NOTE
Do not start the system before filling up with wa-
ter. Components in the system could be damaged.
NOTE
Do not start VVM S320 if there is a risk that the
water in the system has frozen.
Caution
Check the miniature circuit-breaker. It may have
tripped during transport.
(Only applies to 1x230V and 3x230V.)
1. Check that VVM S320 is closed.
2. Check that the drain valve (QM1) is fully closed and that
the temperature limiter (FQ10) has not deployed.
Filling and venting
Caution
Insufficient venting can damage internal compon-
ents in VVM S320.
FILLING THE HOT WATER HEATER
1. Open a hot water tap in the house.
2. Fill the hot water heater through the cold water connec-
tion (XL3).
3. When the water that comes out of the hot water tap is
no longer mixed with air, the water heater is full and the
hot water tap can be closed.
FILLING VVM S320
1. Open the vent valve (QM20).
2. Open the filling valves (QM11, QM13). VVM S320 is filled
with water.
3. When the water exiting the vent valve (QM20) is no
longer mixed with air, close the vent valve. After a while
the pressure starts to rise on the pressure gauge. When
the opening pressure for the safety valve has been
reached, it starts to release water. Close the filling valve.
Vent the water heater coil using the vent valve (QM22).
4. Open the safety valve until the pressure in VVM S320
falls to the normal working range (approx. 1 bar) and
check that there is no air in the system by turning the
vent valve (QM20).
NIBE VVM S320Chapter 6 | Commissioning and adjusting28
Commissioning and adjusting
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