Nibe AXC 50 - 9 Passive Cooling (2-Pipe); General; Pipe Connections

General
The collector circuit is connected to a heat exchanger via
a three way valve. The other side of the exchanger is
connected to the heating medium circuit via a shunt valve
and a circulation pump.
When cooling is required (activated from the outdoor
sensor and any room sensor or room unit) the three way
valve and the circulation pump are activated. The shunt
valve regulates so that the cooling sensor reaches the
current set point value that is equal to the outdoor tem-
perature and the set min. value for the cooling temperat-
ure (to prevent condensation).
Caution
This accessory may require a program software
update in your F1345.
2755 or higher is the minimum software version
for the heat pump.
Pipe connections
-EP6 -RM12
-EQ1
-QN18
-QN12
A
B
AB
AB
B
A
p
-GP13




1) Brine from heat pump
2) Brine to brine system
3) Heating medium to and from the heat pump
4) Heating medium to and from the climate system
Shuttle valve
The three way valve (QN12) is located in the brine system
on the flow line from the heat pump according to the
outline diagram.
A
B
AB
႑
Connect port A on the three- way valve
(open at signal) to the exchanger (EP6).
႑
Connect the common port AB on the
three-way valve (always open) to the
flow line (brine) from the heat pump.
႑
Connect port B on the three-way valve (normally open,
motor in stand-by mode) via T-pipe to brine out to the
collector from the exchanger (EP6).
Shunt valve
The shunt valve (QN18) is located on the return to the
heat pump from the climate system according to the
outline diagram.
AB
B
A
႑
Connect port A on the shunt valve
(opens at increased signal) to the ex-
changer (EP6).
႑
Connect the common port AB on the
shunt valve (always open) to the return
line from the climate system.
႑
Connect port B on the shunt valve (closes at reduced
signal) via T-pipe to the flow line to the climate system
from the exchanger.
33Chapter 9 | Passive cooling (2-pipe)AXC 50
9 Passive cooling (2-pipe)