FIXED CONDENSING
If F1155 is to work towards a water heater with fixed
condensing, you must connect external supply temper-
ature sensor (BT25) according to the description on page
23. In addition, you must make the following menu
settings.
Menu setting (local vari-
ations may be required)
Menu
Desired temperature in the
tank.
1.9.3.1 - min. flow line
temp. heating
Desired temperature in the
tank.
5.1.2 - max flow line temper-
ature
intermittent5.1.10 - op. mod heat med
pump
manual4.2 - op. mode
Docking alternatives
F1155 can be connected in several different ways, some
of which are shown below.
Further option information is available at www.nibe.co.uk
and in the respective assembly instruction for the ac-
cessory used. See page 65 for a list of accessories that
can be used with F1155.
BUFFER VESSEL
If the climate system volume is too small for the heat
pump output, the radiator system can be supplemented
with a buffer vessel, for example NIBE UKV.
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 28
for more information about connecting a ground water
pump.
If this docking alternative is used, "min. brine out" in
menu 5.1.7 "br pmp al set." must be changed to a suit-
able 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 to provide ventilation recovery.
• Pipes and other cold surfaces must be insulated with
diffusion-proof material to prevent condensation.
FREE COOLING
The accessory PCS 44 allows the connection of passive
cooling, for example with fan coils. The cooling system
is connected to the heat pump brine circuit, whereby
cooling is supplied from the collector via a circulation
pump and shunt valve.
• Pipes and other cold surfaces must be insulated with
diffusion-proof material to prevent condensation.
• Where the cooling demand is high, fan convectors
with drip trays and drain connection are needed.
-EP25-AA25
-EP25-QN18-EP25-BT64
-EP25-GP13
-EP25-BT65
-EP25-RM1
-EP25
NIBE F1155Chapter 4 | Pipe connections18
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