Nibe S2125, Installer Manual, Page: 23 / 64

Pipe coupling heating medium
circuit
You can find a list of compatible products in the section
"Compatible indoor modules (VVM) and control modules
(SMO)".
Caution
There is a difference between connection to a
control module compared with connection to an
indoor module.
See the Installer Manual for the indoor module/con-
trol module.
The heat pump is vented automatically with the aid of the
gas separator (HQ8). The gas separator closes automatically
when the valve housing has been vented and filled with li-
quid.
Install as follows:
• expansion vessel
• pressure gauge
• pressure relief valve
• charge pump
• shut-off valve
To facilitate any future servicing.
• enclosed filterball (QZ2)
Installed before connection "heating medium return" (XL2)
(the lower connection) on the vacuum pump.
• reversing valve.
When connecting to the control module, and if the system
is to be able to work with both the climate system and the
hot water heater.
• trim valve
When connecting to control module and hot water heater.
P
XL1
XL2
The image shows connection to the control module.
CHARGE PUMP
The charge pump (not included in the product) is powered
and controlled from the indoor module/control module. It
has a built-in frost protection function and, for this reason,
must not be switched off when there is a risk of freezing.
At temperatures below +2 °C the charge pump runs period-
ically, to prevent the water from freezing in the charge cir-
cuit. The function also protects against excess temperatures
in the charge circuit.
PRESSURE DROP, HEATING MEDIUM SIDE
The diagram shows the pressure drop on the heating medi-
um side, including the gas separator.
Pressure drop
(kPa)
Flow
(l/s)
0
2
4
6
8
10
12
14
0 0,1 0,2 0,3 0,4 0,5
Tryckfall
[kPa]
Flöde [l/s]
Tryckfall S2125
PIPE INSULATION
UN
All outdoor pipes must be insulated with at least 19 mm thick
pipe insulation.
23 Chapter 4 | Pipe connections NIBE S2125