13.1.2.3 Space heating pipes connection
The unit is factory supplied with two shut-down valves to be connected to the water inlet/outlet pipe. With these shut-down valves it
is very practical to connect the indoor unit to the heating system by using the factory supplied gaskets just below the valves (2-3HP:
G 1”; 4-6HP: G 1-1/4”). Then, the space heating installation can be carried out.
Shut-off valves
Gaskets
13.1.2.4 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 possible to the tank) to provide the
following functions.
• Pressure protection
• Non-return function
• Shut-down valve
• Filling
• Draining
If not, a specic 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 “14.2.3 Hydraulic circuit checking (space heating and DHW)”.
13.1.2.5 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
• Discharge pipe must be made of metal or any other material capable to withstand the high pressure and high temperature from the P&T relief valve.
• For a correct installation and workpipe of the discharge pipe on UK market models, refer to UK Building Requirements
MAINTENANCE
PMML0575 rev.2 - 03/2022
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