Minimum Requirements Of The Protection Devices - Hitachi YUTAKI S COMBI Series Installation And Operation Manual

6.2.2 Minimum requirements of the protection devices
!
CAUTION
• Ensure specifically that there is an Earth Leakage Breaker (ELB) installed for the units (outdoor
and indoor unit).
• If the installation is already equipped with an Earth Leakage Breaker (ELB), ensure that its rated
current is large enough to hold the current of the units (outdoor and indoor unit).

NOTE
• Electric fuses can be used instead of magnetic Circuit Breakers (CB). In that case, select fuses
with similar rated values as the CB.
• The Earth Leakage Breaker (ELB) mentioned on this manual is also commonly known as Residual
Current Device (RCD) or Residual Current Circuit Breaker (RCCB).
• The Circuit Breakers (CB) are also known as Thermal-Magnetic Circuit Breakers or just Magnetic
Circuit Breakers (MCB).
◆ Split system - Indoor unit
YUTAKI S Combi
Model Power supply
~ 230V 50Hz
3N~ 400V 50Hz
~ 230V 50Hz
3N~ 400V 50Hz
PMEN0645 rev.0 - 04/2023
Applicable voltage
U max U min
(V) (V)
Without electric heaters
With electric heater
253 207
With DHW tank heater
With electric and DHW tank heaters
Without electric heaters
With electric heater
440 360
With DHW tank heater
With electric and DHW tank heaters
Without electric heaters
With electric heater
253 207
With DHW tank heater
With electric and DHW tank heaters
Without electric heaters
With electric heater
440 360
With DHW tank heater
With electric and DHW tank heaters
Operation mode
ELB
MC CB
(number of
(A) (A)
poles/A/mA)
5
0.6
16
13.7
2/40/30
16
12.6
32
25.6
0.6 5
8.7 10
4/40/30
12.6 16
12.6 16
5
0.6
26.7 32 2/40/30
16
12.6
50 2/63/30
38.7
0.6 5
17.3 20
4/40/30
12.6 16
17.3 20
37
6