Nibe S1256 - Page 18

BUFFER VESSEL (UKV)
UKV is an accumulator tank that is suitable for connection
to a heat pump or another external heat source, and can
have several different applications.
For further information, see the Installer Manual for the ac-
cessory.
Volume
A 2-pipe-connected buffer vessel is used when the system
volume in the climate system is less than the minimum re-
commended volume for the heat pump.
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. The circuit between
the heat pump and the intermediate heat exchanger must
be mixed with antifreeze. See "Possible selections for AUX
output" for more information about connecting a groundwa-
ter 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
VENTILATION RECOVERY
The installation can be supplemented with the exhaust air
module NIBE FLM S45 to provide ventilation recovery.
• Pipes and other cold surfaces must be insulated with dif-
fusion-proof material to prevent condensation.
• The brine system must be supplied with a pressure expan-
sion vessel. If there is a level vessel this should be re-
placed.
P
EXTRA CLIMATE SYSTEM
In buildings with several climate systems that require differ-
ent supply temperatures, the accessory ECS 40/ECS 41 can
be connected.
A shunt valve then lowers the temperature to the underfloor
heating system, for example.
-EP21-GP10-EP21-BT2
-EP21-AA25
-EP21-BT3
-EP21-QN25
-EP21
NIBE S1256Chapter 4 | Pipe connections18