General
Pipe installation must be carried out in accordance with
current norms and directives. F1155 can operate with a
return temperature of up to 58 °C and an outgoing
temperature from the heat pump of 70 (65 °C with only
the compressor).
F1155 is not equipped with external shut off valves; these
must be installed to facilitate any future servicing.
Caution
Ensure that incoming water is clean. When us-
ing a private well, it may be necessary to sup-
plement with an extra water filter.
Caution
Any high points in the climate system, must be
equipped with air vents.
NOTE
The pipe system needs to be flushed out before
the heat pump is connected so that 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.
Hard water areas
Usually, there should not be a problem in installing F1155
in areas with hard water as the maximum operating
temperature is 60 °C.
Cleaning the climate system
When the water heater and the climate system have
been filled with water, F1155 must operate at maximum
normal temperature for at least one hour. Thereafter
the system must be drained of water and refilled.
Before installing the heat pump in an existing system, it
is important that the system is properly flushed through.
Even if the heat pump is to be installed in a new system,
the heat pump and system should be flushed.
NOTE
Ensure that cleaning agent has been removed
from the entire system before adding inhibitor.
After flushing an inhibitor should be used for long-term
anti-corrosion protection.
NIBE Energy Systems Limited recommends water treat-
ments (supplied by e.g. Fernox and Sentinel) specifically
designed for heat pumps.
Symbol key
MeaningSymbol
Shut-off valve
Non-return valve
Mixing valve
Shunt / shuttle valve
Safety valve
Temperature sensor
Pressure gauge
Circulation pump
Particle filter
Filterball (ball valve with integrated particle fil-
ter)
Compressor
Expansion vessel
Level vessel
Heat exchanger
NIBE F1155Chapter 4 | Pipe connections14
4 Pipe connections
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