Riello NXHM - Page 20

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ENGLISH
8.7 Application 7
The units are installed in parallel and can be used for cooling, heating and hot water.
 6 units can be connected in parallel. Please refer to 9.7.5 for the parallel system electrical control system connection diagram.
 The parallel system can control and view the operation of the entire system only by connecting the master to the wire controller.
 If the DHW function is required, the water tank can only be connected to the master unit water circuit through a three-way valve, and
controlled by the master unit.
 If you need to link with AHS, the AHS can only be connected to the master waterway and controlled by the master unit; The connection
and function of the terminal are the same as the single unit, please refer to the application 8.1~8.6.
2
1-1
1-2
1-n
3
8.1
25
10
4
67
8.2
8
9
19
23
23.1
23.2
18
----
FHL1 FHL2 ---- FHLn
----
FCU1 FCU2 ---- FCUn
24
11
11
17
16
16
AHS
12.1
12.2
12.3
12
13
14
15
16
16
2
3
16
2
3
Code Assembly unit
1-1 Outdoor unit: master
1-2...1-n Outdoor unit: slave
2 <VKDSH¿OWHU
3 6WRSYDOYH¿HOGVXSSO\
4 Wired controller
6 'UDLQYDOYH¿HOGVXSSO\
7 )LOOYDOYH¿HOGVXSSO\
8 %DODQFHWDQN¿HOGVXSSO\
8.1 Air purge valve
8.2 Drain valve
9 ([SDQVLRQYHVVHO¿HOGVXSSO\
10 PUMP_ORXWVLGHFLUFXODWLRQSXPS¿HOGVXSSO\
11 &ROOHFWRUGLVWULEXWRU¿HOGVXSSO\
12 Domestic hot water tank ¿HOGVXSSO\
12.1 Air purge valve
12.2 Heat exchanger coil
12.3 Booster heater
13 T5: DHW tank temp. sensor
14 Hot water tap¿HOGVXSSO\
15 PUMP_D: DHW pump¿HOGVXSSO\
16 One way valve¿HOGVXSSO\
17 Bypass valve ¿HOGVXSSO\
18 SV1: 3-way valve¿HOGVXSSO\
19 SV2: 3-way valve¿HOGVXSSO\
23 Mixing station ¿HOGVXSSO\
23.1 PUMP_C: zone 2 pump¿HOGVXSSO\
23.2 SV3: 3-way valve¿HOGVXSSO\
24 TW2: ]RQHZDWHUÀRZWHPSHUDWXUH (accessory)
25 Tbt1: Balance tank temp. sensor (accessory)
FHL
1… n
)ORRUKHDWLQJORRS¿HOGVXSSO\
FCU
1… n
)DQFRLOXQLWV¿HOGVXSSO\
AHS $GGLWLRQDOKHDWLQJVRXUFHERLOHU¿HOGVXSSO\
NOTE
 The volume of balance tank (8) should be greater than 40*n ("n" means n ° units installed, max 6 units). The drain valve (6) should be
installed at the lowest positon of the system.
 The water inlet and outlet pipe joints of each unit of the parallel system should be connected with soft connections, and one-way valves
must be installed at the water outlet pipe.
 The Tbt1 temperature sensor must be installed in the parallel system (otherwise unit cannot be started), the temperature point is set
in the balance tank (8).