Pipe Connections; Condensation Insulation - Nibe HPAC45 Manual De Instalación

GB

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
outgoing 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 exchanger is connected.
Pipe connection, the building's climate sys-
tem
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
(installed 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 protec-
ted.
If HPAC 45 is connected to a system with thermostats
on all convectors, a bypass valve must be fitted, or a
thermostat 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 % propyl-
ene 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
possible. 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 ground water flow must be sufficiently
large for all components.
20
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 ex-
pansion 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 disturb-
ances. The pressure expansion vessel covers the tem-
perature range from -10 °C to +20 °C for the brine at
a pre-pressure 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.
Expansion vessel
50
40
30
20
10
0
0 100 200 300
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 temperat-
ures, any convection fan used must be fitted with a
drip tray and drain connection.
500 600 700 800 900 1000
Brine volume