Pipe Connections - Nibe HPAC 42 Manual De Instalación

GB

Pipe connections

General
Pipe installation must be carried out in accordance with
current norms and directives. HPAC 42 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 sy-
stem
Connect the heat pump to HPAC 42 and, where applic-
able, hot water heating.
Pipe connections are made at the bottom and top of
HPAC 42. 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 fit-
ted in such a way that HPAC 42 is also protected.
If HPAC 42 is connected to a system with thermostats on
all convectors, a bypass valve must be fitted, or a thermo-
stat must be removed to ensure sufficient 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.
If the temperature of the brine system can 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
meter 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 system,
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
18
ground water flow must be sufficiently large for all com-
ponents.
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.
The pressure expansion vessel should be dimensioned as
set out in the diagram, to prevent operating disturbances.
The pressure expansion vessel covers the temperature
range from -10 °C to +20 °C for the brine at a pre-pres-
sure of 0,5 bar and the safety valve's opening pressure
of 3 bar. The brine side must normally be pressurised to
at between 1,0 and 1,5 bar.
50
40
30
20
10
0
0 100 200 300 400
Condensation insulation
Pipes and other cold surfaces must be insulated with dif-
fusion-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.
500 600 700 800 900 1000