NOTE
The pipe systems need to be flushed out before
the indoor module is connected so that any debris
cannot damage component parts.
NOTE
Water may drip from the safety valve’s overflow
pipe. The overflow pipe must be routed to a suit-
able drain, so hot water splashes cannot cause
harm. The entire length of the overflow pipe must
be inclined to prevent water pockets, and must
also be frost-proof. The overflow pipe must be at
least the same size as the safety valve. The over-
flow pipe must be visible and its mouth must be
open and not placed close to electrical compon-
ents.
NOTE
Switch (SF1) must not be moved to "" or "
" until
VVM 310 has been filled with water. Otherwise the
temperature limiter, thermostat and the immersion
heater etc can be damaged.
SYSTEM VOLUME
H
Internal volume in VVM 310 for
calculating expansion vessel is
250 l. The expansion vessel's
volume must be at least 5 % of
the system's total volume.
Example table
Volume (l) ex-
pansion vessel
Total volume (l)
(indoor module
and climate sys-
tem)
25
500
35
700
50
1,000
NOTE
Expansion vessels are 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 permit-
ted height difference of 5 m.
If the standard pre-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 pre-pressure
must be entered in the check list on page 5.
Any change in the initial pressure affects the ability of the
expansion vessel to handle the expansion of the water.
NIBE VVM 310
Chapter 4 | Pipe connections
12
