Pipe And Ventilation Connections; General Pipe Connections - Nibe F750 Installer Manual

4 Pipe and ventilation
connections
General pipe
connections
Pipe installation must be carried out in accordance with
current norms and directives.
The system requires the radiator circuit to be designed
for a low temperature heating medium. At the lowest
dimensioned outdoor temperature (DOT) the highest
recommended temperatures are 55 °C on the supply
line and 45 °C on the return line.
Overflow water from the evaporator collection tray and
safety valves passes via a non-pressurised pipe to an
overflow cup, and from there to a drain, so that hot
water splashes cannot cause injury. The entire length
of the overflow water pipe must be inclined to prevent
water pockets and must also be frost-proof.
NOTE
The pipe system needs to be flushed out be-
fore the heat pump is connected so that any
debris cannot damage component parts.
Caution
Ensure that incoming water is clean. When
using a private well, it may be necessary to
supplement with an extra water filter.
NIBE F750
MAX. VOLUME IN THE HEATING SECTION
AND THE CLIMATE SYSTEM
The volume of the pressure expan-
sion vessel (CM1) is 10 litres and it
is pre-pressurised as standard to 0.5
bar (5 mvp). As a result, the maxim-
um permitted height "H" between
the expansion vessel and the highest
installed radiator is 5 m, see figure.
If the pre-pressure is not high
enough, it can be increased by
adding air via the valve in the expan-
sion vessel. The expansion vessel's
pre-pressure must be stated in the inspection document.
Any change in the pre-pressure affects the ability of the
expansion vessel to handle the expansion of the water.
The maximum system volume, excluding the heating
section, is 260 litres at the above pre-pressure.
Chapter 4 | Pipe and ventilation connections 15