Hydraulic connections
15
AW 4 | 5 | 7 OR-S – 6721866761 (2023/06)
5 Hydraulic connections
5.1 Pipe connections, general
NOTICE
Residue in the pipework can damage the system.
Solids, metal/plastic filings, flux and thread tape residue and similar
material can get stuck in pumps, valves and heat exchangers.
▶ Keep foreign bodies from entering the pipework.
▶ Do not leave pipe parts and connections directly on the ground.
▶ When deburring, make sure that no residue remains in the pipe.
▶ Before connecting the heat pump and indoor unit, rinse the pipe
system to remove any foreign bodies.
NOTICE
Material damage due to frost and UV radiation!
In case of a power outage the water in the pipes may freeze.
The insulation may become brittle due to UV radiation and crack after
some time.
▶ Use insulation with a thickness of at least 19 mm for pipework and
connections outdoors.
▶ Install drain valves so that the water can be drained out of the lines to
and from the heat pump if it is not going to be used for some time or
if there is a risk of frost.
▶ Use UV and moisture-resistant insulation.
Insulation/gaskets.
▶ All heat-bearing lines must be fitted with suitable heat insulation in
accordance with applicable standards.
▶ In cooling mode, all connections and lines must be insulated
according to applicable standards to prevent condensation.
▶ Insulate the wall insertion.
Dimension the pipes according to the instructions (installation
instructions for the indoor unit).
▶ Avoid splicing the heat transfer pipes to minimise pressure drop.
▶ Use PEX pipes for all connections between the heat pump and indoor
unit.
▶ Use only material (pipes and connections) from the same PEX
distributor to avoid leakage.
▶ Pre-insulated AluPEX pipes are recommended since they make
installation easier and prevent gaps in the insulation. PEX or AluPEX
pipes also devibrate and insulate against noise transfer to the heating
system.
If a different material than PEX is used, the following is required:
▶ Install a particulate filter intended for outdoor use on the heat pump
return line, directly on the heat exchanger.
▶ Insulate the particle filter as other connections.
▶ Devibrate the heat pump connection with a hose intended for outside
use and insulate it.
5.2 Drain for condensate
NOTICE
Damage due to risk of frost!
If the condensate freezes and cannot be routed away from the heat
pump, the evaporator may be damaged.
▶ Always install pipe trace heating if ice is likely to form in the
condensate hose.
The product contains the refrigerant R290. In the event of a leak, the
refrigerant may end up in the ground via the condensate drain.
▶ Use a frost free siphon if the condensate pipe is connected to an
existing outlet pipe / rain drainage.
Condensate must be routed away from the heat pump via a frost-free
drain; the drain must slope sufficiently to prevent water from
accumulating in the pipe.
The condensate can be drained into a gravel bed or culvert.
A loop of the drip tray heater cable can be pulled out approx. 50 cm and
pushed into the drain pipe. This only applies if pipe trace heating is not
used.
The drain pipe must have a larger diameter than the drain connector and
not be fitted to each other.
Fig. 25 Installation of drain connector
[1] Loop of drip tray heater cable
[2] Drain connector
0010042509-003
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