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 dimen-
sioned outdoor temperature (DOT) the highest recommended
temperatures are 55 °C on the supply line and 45 °C on the
return line.
Caution
Ensure that incoming water is clean. When using
a private well, it may be necessary to supplement
with an extra water filter.
NOTE
The pipe systems need to be flushed out before
the heat pump is connected so debris cannot
damage component parts.
NOTE
Water may drip from the safety valve. A factory-
fitted overflow pipe runs from the safety valve to
an overflow cup. An overflow pipe has to be routed
from the overflow cup to a suitable drain. The en-
tire length of this overflow pipe is inclined to pre-
vent water pockets, and it must also be frost-
proof.
NOTE
This installation is subject to building regulation
approval, notify the local Authority of intention to
install.
NOTE
Use only manufacturer’s recommended replace-
ment parts.
Waste water from the evaporator’s collection tray and from
safety valves is led via an unpressurised overflow pipe to
the drain, so that hot water splashes cannot cause damage.
The mouth of the overflow pipe must be visible and not
placed close to electrical components. In addition, the mouth
of the overflow pipe (tundish), drain valves and motorised
valves should also be positioned well away from all electrical
components. This is the only permitted use of unpressurised
overflow pipes. Overflow pipes from tundish (WM3) connec-
ted to the expansion relief valve (FL1) must also be connec-
ted to the drain in the same way.
The connection for the T&P valve (XL29) must not be used
for any other purpose. Valves may not be positioned between
the T&P valve (FL5) and the water heater.
Overflow pipes from tundish must be routed with a fall and
be at least 300 mm long, before bends or angles in the
pipework (see image) and must also be frost-proof.
Matal discharge pipe
from tundish, with
continous fall.
Min. 300 mm
Tundish
Safety device
(e.g. temperature
relief valve)
Metal discharge pipe
from temperature relief
valve to tundish
Possible
wall
Discharge
below fixed
grating
Fixed
grating
Trapped
gulley
Max 600 mm
NIBE S735Chapter 4 | Pipe and ventilation connections14
Pipe and ventilation connections
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