Nibe F730 - Pipe and Ventilation Connections; General Pipe 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.
NOTE
The pipe system needs to be flushed out be-
fore the heat pump is connected so that any
debris cannot damage component parts.
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.
Overflow water from the safety valves and the evapor-
ator’s collection tray passes via a non-pressurised over-
flow pipe to a drain, so that hot water splashes cannot
cause injury. 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 be positioned
away from all electrical components. This is the only
permitted use of non-pressurised overflow pipe. Over-
flow pipes from tundish connected to the expansion
relief valve must also be connected to the drain in the
same way.
Please note that the connection of the T&P-valve should
not be used for any other purpose.
Valves may not be positioned between the safety valve
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
Resistance created by
each elbow or bend
Maximum resistance
allowed, expressed as
a lenght of straight pipe
(i.e. no elbows or
bends)
Minimum size of dis-
charge pipe from tun-
dish
Minimum size of dis-
charge pipe
Valve outlet size
0.8 mmup to 9 m22 mm15 mmG1/2
1.0 mmup to 18 m28 mm15 mmG1/2
1.4 mmup to 27 m35 mm15 mmG1/2
1.0 mmup to 9 m28 mm22 mm<G3>/4
1.4 mmup to 18 m35 mm22 mm<G3>/4
1.7 mmup to 27 m42 mm22 mm<G3>/4
1.4 mmup to 9 m35 mm28 mmG1
15Chapter 4 | Pipe and ventilation connectionsNIBE F730
4 Pipe and ventilation
connections