Climate system
A climate system is a system that regulates the indoor
temperature with the help of the control system in S1256
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.
Install the safety valve as illustrated.
• enclosed filterball (QZ2)
Install the filterball as close to S1256 as possible.
• shut-off valve
Install the shut-off valve as close to S1256 as possible.
• When connecting to a system with thermostats, either a
bypass valve must be fitted or, alternatively, some of the
thermostats must be removed 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 an opening pressure of max.
1.0 MPa (10.0 bar).
• 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
S1256 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 68 for a list of the accessories that can be used
with S1256.
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 S1256.
HOT WATER CIRCULATION
A circulation pump can be controlled by S1256 to circulate
the hot water. The circulating water must have a temperat-
ure that prevents bacterial growth and scalding, and national
standards must be satisfied.
The HWC return can be connected to XL5 or a freestanding
water heater. If an electric water heater is connected after
the heat pump, the HWC return must be connected to the
water heater.
The circulation pump is activated via the AUX output in menu
7.4 -"Selectable in/outputs".
HWC can be supplemented with a hot water sensor for HWC
(BT70) and (BT82), which is connected via the AUX input
and activated in menu 7.4 -"Selectable in/outputs".
-QZ1-FQ3
-QZ1-GP11
-QZ1-RM1
-QZ1-RN1
-QZ1
17Chapter 4 | Pipe connectionsNIBE S1256
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