Pipe Connections; Condensation Insulation - Nibe HPAC 45 Installateurhandbuch

Pipe connections

General
Pipe installation must be carried out in accordance with
current norms and directives. HPAC 45 can only operate
up to a return temperature of about 50 °C and an outgo-
ing temperature of about 65 °C from the heat pump.
When the heat pump is not equipped with shut-off
valves, these must be installed outside the heat pump
to facilitate any future servicing.
The fluid in the building's distribution system is the same
as in the surface soil/rock collector, if no other heat ex-
changer is connected.
Pipe connection, the building's climate system
Connect the heat pump to HPAC 45 and, where applic-
able, hot water heating.
Pipe connections are made at the bottom and top of
HPAC 45. All required safety devices, shut-off valves (in-
stalled as close to the cooling module as possible), and
particle filter (supplied with the heat pump) are to be
fitted in such a way that HPAC 45 is also protected.
If HPAC 45 is connected to a system with thermostats
on all convectors, a bypass valve must be fitted or a
number of thermostats must be removed to ensure suf-
ficient flow.
Pipe connection, collector side
The length of the collector hose varies depending on the
rock /surface soil conditions and on the climate system.
Ensure the collector hose rises constantly towards the
heat pump to avoid air pockets. If this is not possible,
airvents should be used.
The climate system must be supplied with two pressure
expansion vessels.
All the system's pipes must be condensation insulated
except the pipes to the water heater.
Because the temperature of the brine system may fall
below 0 °C, this must be protected against freezing
through the mixture of propylene glycol (NOTE! Not
ethanol). The mixing ratio should be approximately 25 %
propylene glycol and the remainder water. As a guideline
for the volume calculation, use 1 litre of ready mixed
brine per metre of collector hose (for 40 x 2.4 PN 6.3 PEM
hose).
The installation should be marked with the antifreeze
used.
Install shut off valves as close to the heat pump as pos-
sible. Fit a particle filter to the incoming pipe.
In the case of connection to an open groundwater sys-
tem, an intermediate frost-protected circuit must be
provided, because of the risk of dirt and freezing in the
evaporator. This requires an extra heat exchanger. In
addition, the ground water flow must be sufficiently
large for all components.
HPAC 45 | GB
NOTE
This system solution means that the brine will
also circulate through the heating system.
Check that all component parts are designed
for the brine in question.
Expansion vessel
The brine circuit must be supplied with a pressure expan-
sion vessel (membrane type). If there is already a level
vessel installed this should be replaced.
To prevent malfunctions, the pressure expansion vessel
should be dimensioned as set out in the diagram. The
pressure expansion vessel covers the temperature range
from -10 °C to +20 °C at pre-pressure 0,5 bar and the
safety valve's opening pressure of 3 bar. The brine side
must normally be pressurised to between 1,0 and 1,5
bar.
Tryckexpansionskärl
Expansion vessel (litres)
(l)
50
40
30
20
10
0
0 200 400

Condensation insulation

Pipes and other cold surfaces must be insulated with
diffusion-proof material to prevent condensation.
Where the system may be operated at low temperatures,
any convection fan used must be fitted with a drip tray
and drain connection.
600 800 1000
Brine volume (litres)
Köldbärarvolym
(l)
19