Hitachi YUTAKI M R32 Series - DHW Pipes Connection; Drain Pipes Connection

120
PMML0600 rev.0 - 06/2022
8
YUTAKI H COMBI
MAINTENANCE
8.3.4 DHW pipes connection
The connection between the DHW installation and the DHW connections of the indoor unit must
be done taking into account the following considerations:
1 Install a pressure and temperature relief valve at the DHW inlet connec tion (as close as possi-
ble to the tank) to provide the following functions.
• Pressure protection
• Non-return function
• Shut-down valve
• Filling
• Draining
If not, an specic device for each function should be installed.
2 Install also a shut-down valve (eld supplied) in the DHW outlet connection, in order to make
easier any maintenance work.
 NOTE
For more details, refer to the section “5.5 Space heating and DHW for YUTAKI M / YUTAKI Hydrosplit”.
8.3.4.1 Drain pipes connection
For a correct drainage, connect the drain pipe for the safety valve (located at the top rear side of
the unit) to the general draining system.
Safety valve
P&T relief valve
(Only for UK market)
 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.
• P&T relief valve is activated when water pressure reaches 7 bar and/or water temperature
reaches 96ºC