Installation Of Indoor Unit; Installation Procedure; Refrigerant Piping Connection - Hitachi YUTAKI S COMBI series Bedienungsanleitung

UNIT INSTALLATION

6.3 INSTALLATION OF INDOOR UNIT

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N O T E
Please, try to perform all this procedure following all the steps in the exact
order in which they are presented below.

Installation procedure

1 Space heating pipes connection
2 Drain pipes connection
3 DHW pipes connection

4 Refrigerant piping connection

5 Power and transmission wiring connection
6 Levelling procedure
7 Test and check
6.3.1 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
6.3.2 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, an specific device for each function should be installed.
2 Install also a shut-down valve (field supplied) in the DHW
outlet connection, in order to make easier any maintenance
work.
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N O T E
For more details, refer to the section
(space heating and DHW)".
25 PMML0338B rev.1 - 03/2016
"7.2.3 Hydraulic circuit checking
6.3.3 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. (Example for RWD-(2.0-6.0)NWE-260S).
P&T relief valve
(Only for UK market)
Discharge pipe for
safety valve
(Only for UK market)
Drain pipe for
safety valve
Safety valve
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• 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
6.3.4 Refrigerant piping connection
Make the connection of refrigerant pipes respecting the
considerations indicated in the CD-ROM factory-supplied with
the unit. The refrigerant piping connections are flare nut.