To Connect The Backup Heater Power Supply - Daikin EHFZ03S18DJ3V Installer's Reference Manual

9 | Electrical installation

9.3.2 To connect the backup heater power supply

Installer reference guide
96
INFORMATION
In case of preferential kWh rate power supply, connect X11Y to X11YB. The necessity
of separate normal kWh rate power supply to indoor unit (b) X2M/5+6 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.
INFORMATION
The preferential kWh rate power supply contact is connected to the same terminals
(X5M/9+10) as the safety thermostat for the additional zone. It is only possible for
the system to have EITHER preferential kWh rate power supply OR a safety
thermostat for the additional zone.
Backup heater type
*3V
—
WARNING
The backup heater MUST have a dedicated power supply and MUST be protected by
the safety devices required by the applicable legislation.
CAUTION
To guarantee the unit is completely earthed, ALWAYS connect the backup heater
power supply and the earth cable.
Make sure that the power supply is in accordance with the backup heater capacity,
as listed in the table below.
Backup heater Backup
type
capacity
*3V
(a)
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
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
equal to Z .
max
Connect the power supply of the backup heater as follows:
Power supply
1N~ 230 V
Power supply
heater
3 kW 1N~ 230 V
is less than or equal to Z
sys max
Wires
2+GND
Maximum
running current
(a)
13 A
at the interface point between the user's
sys
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10
Z
max
0.34 Ω
less than or