Climate system
A climate system is a system that regulates the indoor
temperature with the help of the control system in S1255
and, for example, radiators, underfloor heating, underfloor
cooling, fan coils, etc.
CONNECTING THE CLIMATE SYSTEM
Install as follows:
• expansion vessel
• pressure gauge
• pressure relief valve
Recommended opening pressure is 0.25 MPa (2.5 bar).
For information about max opening pressure, see technical
data. Install the safety valve as illustrated.
• enclosed filterball (QZ2)
Install the filterball as close to S1255 as possible.
• shut-off valve
Install the shut-off valve as close to S1255 as possible.
• When connecting to a system with thermostats on all ra-
diators/underfloor heating coils, either a bypass valve
must be fitted or some of the thermostats must be re-
moved to ensure there is sufficient flow and heat emission.
Cold and hot water
The settings for hot water are made in menu 7.1.1 - "Hot
water".
CONNECTING COLD AND HOT WATER
Install as follows:
• shut-off valve
• non-return valve
• pressure relief valve
The safety valve must have a maximum 1.0 MPa (10.0 bar)
opening pressure and be installed on the incoming domest-
ic water line as shown.
• mixing valve
A mixer valve must also be installed, if the factory setting
for hot water is changed. National regulations must be
observed.
Installation alternative
S1255 can be installed in several different ways, some of
which are shown here.
Further option information is available at nibe.eu and in the
respective assembly instructions for the accessories used.
See page 64 for a list of the accessories that can be used
with S1255.
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
In a water heater with an immersion heater, the water is
initially heated by the heat pump. The immersion heater in
the water heater is used for keeping warm and when the
heat pump does not have sufficient power.
The water heater’s flow is connected after S1255.
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 infiltration unit or a drilled well. See page Possible
selections for AUX output for more information about con-
necting a groundwater 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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