• 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.
• A mixer valve must also be installed, if the factory
setting for hot water is changed. National regulations
must be observed.
• 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.
• The settings for hot water are made in menu 7.1.1.
Docking alternatives
S1255 can be connected in several different ways, some
of which are shown below.
Further option information is available at nibe.eu/ODM
and in the respective assembly instructions for the ac-
cessories used. See page 66 for a list of the accessories
that can be used with S1255.
EXTRA HOT WATER HEATERS
The heat pump 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 24
for more information about connecting a ground water
pump.
If this docking alternative is used, "min. brine out" in
menu 7.1.2.8 "br pmp al set." must be changed to a
suitable value to prevent freezing of the heat exchanger.
-EP12-GP3
-EP12-HQ40
-EP12-EP4
-EP12-AA25
-EP12
NIBE S1255Chapter 4 | Pipe connections16
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