4 Installation
Installation manual
5
EKMBU EKMBUHCA9W1
Daikin Altherma low temperature monobloc backup heater
4P405547-1C – 2015.08
INFORMATION
Inside the backup heater, an automatic air purge valve is
installed. For the location of this valve, refer to the
"Technical data" chapter of the installer reference guide.
For instructions on how to perform an air purge, refer to the
"Commissioning" chapter of the installation manual of the
outdoor unit.
4.4
Connecting the electrical wiring
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
4.4.1
To connect the electrical wiring on the
backup heater
Routing
Possible cables (depends on the installed options)
a
Low voltage
▪ Backup heater kit thermistor (interconnection with
control box EKCB07CAV3)
▪ Backup heater kit thermal protector (interconnection
with control box EKCB07CAV3)
▪ Backup heater kit connection (to control box
EKCB07CAV3)
b
High
voltage
▪ Main power supply
1
Insert the wiring from the bottom of the backup heater.
2
Inside the backup heater, route the wiring as follows:
Backup heater
type
Routing
*3V
a
b
a
Low voltage wiring
b
High voltage wiring
*9W
a
b
a
Low voltage wiring
b
High voltage wiring
3
Fix the wiring with cable ties to the cable tie mountings.
NOTICE
The distance between the high voltage and low voltage
cables should be at least 25 mm.
4.4.2
To connect the backup heater power
supply
CAUTION
To guarantee the unit is completely earthed, always
connect the backup heater power supply and the earth
cable.
CAUTION
If a tank with a built‑in electrical booster heater (EKHW) is
part of the system, 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.
Depending on the model, the backup heater capacity can vary. 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)
—
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, a
double‑pole fuse is used for F1B. For *9W models, a 4‑pole
fuse is used for F1B.
2
If required, modify the connection on terminal X14M.
Backup heater
type
Connections to
backup heater power
supply
Connections to
terminals
3 kW 1~ 230 V
(*3V)
L N
L N
F1B
—
Summary of Contents for EKMBUHCA3V3
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