Riello NXHM - Double Zone

97
ENGLISH
Room thermostat type2 (RT2) (Low voltage): “POWER IN” provide the working voltage to the RT.
3-phase
POWER SUPPLY
RT
N
HEAT
COOL
H
3
C
4
L1
TO CONTROL PCB
1L1L2L2L3L3LNN
There are three methods for connecting the thermostat cable (as described in the picture above) and it depends on the application.
 Method A
RT can control heating and cooling individually, like the controller for 4-pipe FCU. When the hydraulic module is connected with the external
temperature controller, user interface FOR SERVICEMAN set THERMOSTAT and ROOM MODE SETTING to YES:
A.1 When unit detect voltage is 230VAC between C and N, the unit operates in the cooling mode.
A.2 When unit detect voltage is 230VAC between H and N, the unit operates in the heating mode.
A.3 When unit detect voltage is 0VAC for both side (C-N, H-N) the unit stop working for space heating or cooling.
A.4 When unit detect voltage is 230VAC for both side (C-N, H-N) the unit working in cooling mode.
 Method B
RT provide the switch signal to unit. user interface FOR SERVICEMAN set ROOM THERMOSTAT to ONE ZONE:
B.1 When unit detect voltage is 230VAC between H and N, unit turns on.
B.2 When unit detect voltage is 0VAC between H and N, unit turns on.
NOTE
When ROOM THERMOSTAT is set to YES, the indoor temperature sensor Ta can’t be set to valid, unit running only according to T1.
 Method C
Hydraulic module is connected with two external temperature controllers, while user interface FOR SERVICEMAN set ROOM THERMOSTAT to
DOUBLE ZONE:
C.1
When unit detect voltage is 230VAC between H and N, zone1 turns on . When unit detect voltage is 0VAC between H and N, ]RQHWXUQVRႇ
C.2 When unit detect voltage is 230VAC between C and N, zone2 turns on according to climate temp curve . When unit detect voltage is 0V between
C and N,
]RQHWXUQVRႇ .
C.3
When H-N and C-N are detected as 0VAC, XQLWWXUQVRႇ .
C.4
When H-N1 and C-N are detected as 230VAC, both zone1 and zone2 turn on .
NOTE
 The wiring of the thermostat should correspond to the settings of the user interface (see "10.5.6 Room thermostat").
 Power supply of machine and room thermostat must be connected to the same Neutral Line and (L2) Phase Line (for 3-phase unit
only).
Procedure
 Connect the cable to the appropriate terminals as shown in the picture.
 Fix the cable with cable ties to the cable tie mountings to ensure stress relief.
3. For 3-way value SV3
SV1
1ON
5
1OFF
6
N
16
SV2
2ON
7
2OFF
8
N
17
SV3
3ON
19
3OFF
20
N
18
Voltage 220-240VAC
Maximum running current (A) 0,2
Wiring size (mm²) 0,75
Control port signal type Type 1
NOTE
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3-way valve carefully and install the valve as showed in the picture. Make sure to connect it to the correct terminal numbers.
Procedure
 Connect the cable to the appropriate terminals as shown in the picture.
 Fix the cable reliably.