Nibe VVM 500 - Page 15

Caution
Ensure that incoming water is clean. When
using a private well, it may be necessary to
supplement with an extra water filter.
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 500 has been filled with water.
Otherwise the temperature limiter, thermostat
and the immersion heater etc can be damaged.
BOILER AND RADIATOR VOLUMES
H
Internal volume in VVM 500
for calculating expansion ves-
sel is 500 l. The expansion
vessel's volume must be at
least 5 % of the system's total
volume.
Example table
Volume (l)
expansion
vessel
Total volume
(l) (indoor
module and
climate sys-
tem)
25500
35700
501,000
NOTE
Expansion vessel is not supplied with the
product. Equip the product with an expansion
vessel.
The pre-pressure of the pressure 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
maximum permitted height difference of 5 m.
If the standard initial pressure in the pressure vessel is
not high enough it can be increased by filling via the
valve in the expansion vessel. The expansion vessel's
standard initial pressure must be entered in the check
list on page 6.
Any change in the initial pressure affects the ability of
the expansion vessel to handle the expansion of the
water.
15Chapter 4 | Pipe connectionsNIBE VVM 500