a Interconnection cable (=main power supply)
b Normal kWh rate power supply
c Preferential power supply contact
2 Fix the cable with cable ties to the cable tie mountings.
INFORMATION
In case of preferential kWh rate power supply, the
necessity of separate normal kWh rate power supply to
indoor unit (b) X2M30/31 depends on the type of
preferential kWh rate power supply.
Separate connection to the indoor unit is required:
▪ if preferential kWh rate power supply is interrupted when
active, OR
▪ if no power consumption of the indoor unit is allowed at
the preferential kWh rate power supply when active.
7.6.5 To connect the backup heater power
supply
CAUTION
If the indoor unit has a tank with a built‑in electrical booster
heater (EKHW*), use a dedicated power circuit for the
backup heater and booster heater. NEVER use a power
circuit shared by another appliance. This power circuit
must be protected with the required safety devices
according to the applicable legislation.
The backup heater capacity can vary, depending on the indoor unit
model. Make sure that the power supply is in accordance with the
backup heater capacity, as listed in the table below.
Backup
heater type
Backup
heater
capacity
Power
supply
Maximum
running
current
Z
max
(Ω)
*3V 3 kW 1~ 230 V 13 A —
*9W 3 kW 1~ 230 V 13 A —
6 kW 1~ 230 V 26 A
(a)(b)
0.29
6 kW 3~ 230 V 15 A
(b)
—
6 kW 3N~ 400 V 8.6 A —
9 kW 3N~ 400 V 13 A —
(a) Equipment complying with EN/IEC 61000-3-12 (European/
International Technical Standard setting the limits for harmonic
currents produced by equipment connected to public low-voltage
systems with input current >16 A and ≤75 A per phase.).
(b) This equipment complies with EN/IEC 61000‑3‑11 (European/
International Technical Standard setting the limits for voltage changes,
voltage fluctuations and flicker in public low-voltage supply systems
for equipment with rated current ≤75 A) provided that the system
impedance Z
sys
is less than or equal to Z
max
at the interface point
between the user's supply and the public system. It is the
responsibility of the installer or user of the equipment to ensure, by
consultation with the distribution network operator if necessary, that
the equipment is connected only to a supply with a system impedance
Z
sys
less than or equal to Z
max
.
1 Connect the backup heater power supply.
For *3V models, use a single pole fuse for F1B. For *9W
models, use a double pole fuse for F1B.
Backup heater
type
(a)
Connections to
backup heater power
supply
Connections to
terminals
3 kW 1~ 230 V
(*3V)
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