Nibe F1255 Installation Manual page 18

HARD WATER AREAS
There should not normally be any problem installing
F1255 in hard water areas, as the operating temperature
is 50-60°C.
CLEANING THE CLIMATE SYSTEM
When the water heater and the climate system have
been filled with water, F1255 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
treatments (supplied by e.g. Fernox and Sentinel) spe-
cifically designed for heat pumps.
18 Chapter 4 | Pipe connections
SYMBOL KEY
SYSTEM DIAGRAM
F1255 consists of a heat pump, water heater, electrical
module, circulation pumps and a control system. F1255
is connected to the brine and heating medium circuits.
In the heat pump evaporator, the brine (water mixed
with anti-freeze, glycol or ethanol) releases its energy
to the refrigerant, which is vaporised in order to be
compressed in the compressor. The refrigerant, of which
the temperature has now been raised, is passed to the
condenser where it gives off its energy to the heating
medium circuit and, if necessary, to the water heater.
If there is a greater need for heating/hot water than the
compressor can provide there is an integrated immersion
heater.
XL1 XL6 XL4
VBf KBin VVKV
XL1 Connection, heating medium flow
XL2 Connection, heating medium return
XL3 Connection, cold water
XL4 Connection, hot water
XL6 Connection, brine in
XL7 Connection, brine out
XL3 XL7 XL2
KBut VBr
NIBE F1255