Installation
39
UNT-SVX10G-E4
Main power supply
It is the installer's responsibility to
ensure that units are protected by
an electrical disconnect device such
as a fuse or circuit breaker.
Standard units with on/off control
are supplied without any protection,
and a fuse disconnect switch is
available as an option. Units with
modulating/communicating ZN
control are supplied with the fuse
disconnect switch factory-mounted
as standard. Refer to the wiring
diagrams supplied with the units for
more information.
To connect main power supply,
refer to Figures 30-31.
Figure 30 - Units with On/Off control
PE
L
N
BK-1A
BU-2A
230V 50Hz
1Ph + N + T
N
L
1F50
1F50
X
7
Figure 31- Units with
modulating/communicating control
with/without electric heater
7 = Fuse disconnect switch option
- - - - Customer wiring
Recommended cable size: 3 x
1.5mm² and higher depending on
electric heater capacity.
Table 13 - Fuse size (A) - FCD/FED
Table 14 - Recomended cable cross-sectional area (mm²)
Minimum
Maximum
FCD-FED without electric heater
1.5
2.5
FCD-FED with electric heater
2.5
6
Without electric
heater
With electric heater
< 2kW
With electric heater
> 2 kW
On/off control
4
16
25
ZN control
4
10
25
UNT-SVX10G-BAT1_Mise en page 1 7/26/2013 2:41 PM Page 39
