Samsung EHS AE050RXYDEG/EU Manual page 209

12. Technical data
NOTE
Shielded / screened cable 0.75 - 1.5 mm 2core cable rated for 240V to be utilized for communication wiring
(shielded / screen to the earthed at outdoor unit only).
Ensure that the required minimum water volume for the system is met.
A low-loss header or buffer tank should be suitably sized to comply with the above.
To ensure the minimum flowrates are maintained at all times, even whilst there is no heating demand,
a low loss header, buffer tank or automatic bypass valve(s) must be fitted into the circuit.
It is advised to mount the unit on rubber feet to reduce the noise and vibration.
This schematic must be used in conjunction with supporting technical documents issued by Samsung.
Installer reference guide / Mono tank integrated type 208