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Installation of Indoor Unit
Hydraulic connection
The dimensioning of circulation pumps, valves, safety elements and pipes has to be performed by
the design engineer according to the heating/cooling capacity of the device.
Before connecting the device, it is necessary to rinse the pipe system thoroughly and remove impuri-
ties (solid particles, oils, greases ...).
Use suitable detergents if necessary.
The closing valve with exhaust has to be installed lower than the pipe connections on the device.
DHW system
The hydraulic connection has to be installed in accordance with the national and local regulations for
connecting buffer tanks for DHW in force. The room the device is installed in must have a drain on
the floor installed below the level of the device in case of water leakage. The following picture shows
the correct hydraulic connection of the device.
Because different materials are used on the pipe installation, all connections on the device (cold
and hot water, circulation, heat conductor) have to be galvanically isolated; otherwise corrosion of
connections can occur on the inner side of the buffer tank for DHW. We recommend placing gal-
vanic isolators made of red brass the length of at least twice the diameter of the pipe on the con-
nections.
The DHW tank is intended for storing drinking water, this is why the water has to be in accordance
with the national regulations on drinking water in force; otherwise, damage to the device and a ter-
mination of the warranty can arise.
The cold DHW connection of the device must be fitted with a safety valve with the rated pressure
of 0.6 MPa (6 bar).
For proper operation of expansion vessel, a suitable setting of the vessels operating pressure must
be made. The pressure is set in regards to the pressure in the DHW system. The setting needs to
be checked every 12 months.
The cold DHW connection must be fitted with an expansion vessel suitable for drinking water. The
selection and installation must be in accordance with the standard DIN 4807 T5.
22 Air-to-Water Heat Pump
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