Pipe And Ventilation Connections General Pipe Connections - Nibe F470 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.
NOTE
The pipe system needs to be flushed out before
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 evaporat-
or's collection tray passes via a non-pressurised overflow
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 addi-
tion, 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. Overflow pipes
from tundish connected to the expansion relief valve
must also be connected to the drain in the same way.
Valve outlet size
G1/2
G1/2
G1/2
<G3>/4
<G3>/4
<G3>/4
G1
G1
G1
Hard water areas
Usually, there should not be a problem in installing F470
in areas of hard water as the operating temperature is
50-60 °C.
16 Chapter 4 | Pipe and ventilation connections
Minimum size of dis- Minimum size of dis-
charge pipe charge pipe from
tundish
15 mm 22 mm
15 mm 28 mm
15 mm 35 mm
22 mm 28 mm
22 mm 35 mm
22 mm 42 mm
28 mm 35 mm
28 mm 42 mm
28 mm 54 mm
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.
Safety device
Metal discharge pipe
(e.g. temperature
from temperature relief
relief valve)
valve to tundish
Max 600 mm
Tundish
Min. 300 mm
Matal discharge pipe Discharge
from tundish, with below fixed
continous fall. grating
Maximum resistance
allowed, expressed
as a lenght of
straight pipe (i.e. no
elbows or bends)
up to 9 m
up to 18 m
up to 27 m
up to 9 m
up to 18 m
up to 27 m
up to 9 m
up to 18 m
up to 27 m
Possible
wall
Fixed
grating
Trapped
gulley
Resistance created by
each elbow or bend
0.8 mm
1.0 mm
1.4 mm
1.0 mm
1.4 mm
1.7 mm
1.4 mm
1.7 mm
2.3 mm
NIBE F470