Preparations
1.
Check that the switch (SF1) is in position " ".
2.
Check that the drain valve (QM1) is fully closed and
that the temperature limiter (FD1) has not de-
ployed.
3.
Compatible NIBE air/water heat pumps must be
equipped with a control card with display that has
at least the software version given in the list on
page 12.
Filling and venting
Filling the hot water heater in VVM 325
1.
Open a hot water tap in the house.
2.
Open shut-off valve. This valve should then be fully
open during operations.
3.
When water comes out of the hot water tap, the
hot water heater is full and the tap can be closed.
Filling the climate system
1.
Open the venting valve (QM20).
2.
Open the filler valve (QM11). Fill VVM 325 with
water.
3.
When the water that exits the vent valve (QM20)
is not mixed with air, close the vent valve. After a
while the pressure rises on the manometer. When
the opening pressure for the safety valve has been
reached, it starts to release water. Close the filler
valve. Vent the water heater coil with QM22.
4.
Open the safety valve (FL2) until the pressure in
VVM 325 drops to the normal working range (ap-
prox. 1 bar) and check that there is no air in the
system by turning the vent valve (QM20).
Venting the climate system
1.
Turn off the power supply to VVM 325.
2.
Vent VVM 325 through the vent valves (QM20,
QM22) and other climate systems through their
relevant vent valves.
3.
Keep topping up and venting until all air has been
removed and the pressure is correct.
Draining the climate system
1.
Connect a hose to the lower filler valve for heating
medium (QM11).
2.
Open the valve to drain the climate system.
Also see Draining the climate system on page 63.
31Chapter 6 | Commissioning and adjustingNIBE™ VVM 325
6 Commissioning and adjusting
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