General
Pipe installation must be carried out in accordance with
current norms and directives. S1256 can operate with a re-
turn temperature of up to 58 °C and an outgoing temperat-
ure from the heat pump of 70 (65 °C with only the com-
pressor).
S1256 is not equipped with external shut off valves; these
must be installed to facilitate any future servicing.
Caution
Ensure that incoming water is clean. When using
a private well, it may be necessary to supplement
with an extra water filter.
Caution
Any high points in the climate system, must be
equipped with air vents.
NOTE
The pipe systems have to be flushed clean before
the product is connected, to prevent any contam-
inants from damaging the components.
NOTE
Water may drip from the safety valve’s overflow
pipe. The overflow pipe must be routed to a suit-
able drain, to prevent hot water splashes from
causing harm. The overflow pipe must be inclined
along its entire length to prevent pockets where
water can accumulate, and must be frost-proof.
The overflow pipe must be at least the same size
as the safety valve. The overflow pipe must be
visible and its mouth must be open and not placed
close to electrical components.
SYMBOL KEY
MeaningSymbol
Unit box
Shut-off valve
Non-return valve
Mixing valve
Circulation pump
Expansion vessel
Filterball
Fan
Pressure gauge
Level vessel
Control valve
Particle filter
Safety valve
Temperature sensor
Trim valve
Reversing valve/shunt
Manual reversing valve/shunt
Heat exchanger
Overflow valve
Bore hole
Ground collector
Cooling system
Pool
Domestic hot water
Hot water circulation
Heat pump
Heating system
NIBE S1256Chapter 4 | Pipe connections14
Pipe connections
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