NOTE
Any high points in the climate system, must
be equipped with air vents.
NOTE
The pipe systems need to be flushed out be-
fore the indoor module is connected so that
any debris cannot damage component parts.
NOTE
Switch (SF1) must not be moved to "" or " "
until VVM 225 has been filled with water.
Otherwise the temperature limiter, thermostat
and the immersion heater etc can be damaged.
BOILER AND RADIATOR VOLUMES
VVM 225 is equipped with a
pressure expansion vessel of
10 litres.
The pre-pressure of the pres-
sure expansion vessel must
be dimensioned according to
the maximum height (H)
between the vessel and the
highest positioned radiator,
see figure. A pre-pressure of
0.5 bar (5 mvp) means a max-
imum permitted height differ-
ence of 5 m.
The maximum system volume excluding the boiler is
220 litres at the above pre-pressure.
Volume expansion
Approx. 10 l/kW is required for connection to the heat
pump, and many heating systems do not have this
volume. To prevent operational problems, the volume
is then expanded using a UKV buffer vessel.
SYSTEM DIAGRAM
VVM 225 consists of water heater with charge coil, ex-
pansion vessel, safety valve (not enamel), filling valve
(not enamel), immersion heater, circulation pump and
control system. VVM 225 connects to the climate sys-
tem.
VVM 225 is directly adapted for connection and commu-
nication with a compatible NIBE air/water heat pump,
see chapter "Outdoor modules", and together they con-
stitute a complete heating installation.
When it is cold outdoors, the air/water heat pump works
with VVM 225, and if the outdoor air temperature falls
below the heat pump’s stop temperature, all heating is
carried out by VVM 225.
Enamel
Stainless steel
17Chapter 4 | Pipe connectionsNIBE VVM 225
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