Space Heating Pipes Connection; Drain Pipes Connection - Hitachi YUTAKI S80 R410A Series Installation And Operation Manual

7.1.1 Space heating pipes connection
The unit is factory supplied with two shutdown valves which have to be connected to the water
inlet / outlet connections. With these shut-off valves it is very practical to connect the indoor
unit to the heating system by using the factory supplied gaskets just below the valves (G 1-1/4"
connection). Then, the space heating installation can be carried out.
7.1.2 Drain pipes connection
For a correct drainage, connect the drain pipe for the safety valve to the general draining system.

NOTE
• The safety valve is activated when water pressure reaches 3 bars.
• Drain taps must be provided at all low points of the installation to permit complete drainage of
the circuit during servicing.
PMEN0648 rev.0 - 03/2023
Shut-off
valves
Gaskets
Drain pipe for
safety valve
Safety
valve
7
73