• Fit safety valve on heating medium return as illus-
trated. Recommended opening pressure is 0.25 MPa
(2.5 bar). For information about max opening pressure,
see technical specifications.
• When connecting to a system with thermostats on all
radiators (or underfloor heating coils), either a bypass
valve must be fitted or some of the thermostats must
be removed to ensure there is sufficient flow.
Cold and hot water
CONNECTING COLD AND HOT WATER
• Fit shut-off valve, non-return valve and safety valve as
illustrated.
• The safety valve must have a maximum 1.0 MPa (10.0
bar) opening pressure and be installed on the incoming
domestic water line as shown.
• A mixer valve must also be installed, if the factory
setting for hot water is changed. National regulations
must be observed.
• The setting for hot water is made in menu 5.1.1 (page
47).
Docking alternatives
F1245 can be connected in several different ways, some
of which are shown below.
Further option information is available at nibe.eu and in
the respective assembly instructions for the accessories
used. See page 69 for a list of the accessories that can
be used with F1245.
BUFFER VESSEL
If the climate system volume is too small for the heat
pump output, the radiator system can be supplemented
with a buffer vessel, for example NIBE UKV.
EXTRA HOT WATER HEATERS
The system should be supplemented with an extra water
heater, if a large bath tub or other significant consumer
of hot water is installed.
Water heater with immersion heater
If it is possible to use a water heater with an immersion
heater, connect it as illustrated below.
GROUND WATER SYSTEM
An intermediate heat exchanger is used to protect the
heat pump's exchanger from dirt. The water is released
into a buried filtration unit or a drilled well. See page 30
for more information about connecting a ground water
pump.
If this docking alternative is used, "min. brine out" in
menu 5.1.7 "br pmp al set." must be changed to a suit-
able value to prevent freezing of the heat exchanger.
-EP12-GP3
-EP12-HQ40
-EP12-EP4
-EP12-AA25
-EP12
19Chapter 4 | Pipe connectionsNIBE F1245
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