5
Hydraulic connections
Hydraulic connections to the centralised line must be implemented
using the manual shut-off valves supplied with the HIU, which allow
any necessary maintenance work to take place without having to
empty the centralised system.
It is advisable to install manual shut-off valves (not supplied) also
on the bottom connections to the apartment circuits.
Before installation, it is recommended to carry out accurate flushing
of all the pipes of the system in order to remove any residue or
impurities that could endanger correct operation of the HIU.
In order to facilitate these operations a manual bypass flushing
valve is available (code 789100).
N.B. Install the valves as shown in the figure
ON DHW CH FAULT
2
1
0
1
2
3
4
bar
ON DHW CH FAULT
2
1
NOTES
:
1 Install water hammer arresters to compensate for any overpressure in the domestic water circuit;
2 In the presence of hot water recirculation or if a non-return valve is fitted into the domestic cold water inlet, provision must be made to
accommodate the expansion of the water contained within the system and the heat interface unit;
3 All hydraulic connections must be checked before pressurising the system. Vibration during transport may cause the connections to become loose.
DO NOT APPLY EXCESSIVE TIGHTENING TORQUE otherwise the components may be damaged.
Key to symbols
Primary circuit flow
Primary circuit return
Domestic hot water outlet
Domestic cold water inlet
Low temperature circuit flow
Low temperature circuit return
High temperature circuit flow
High temperature circuit return
