Daikin EHVZ16S18CB3V [5/28] Overview of electrical connections for external and internal actuators
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Daikin EHVZ16S18CB3V [5/28] Overview of electrical connections for external and internal actuators

Daikin EHVZ16S18CB3V [5/28] Overview of electrical connections for external and internal actuators
4 Installation
Installation manual
5
EHVZ04~16S18CB3V
Daikin Altherma – Low temperature split
4P401672-1E – 2018.02
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup
heater operation) in the installation is guaranteed in all conditions on
each zone separately.
NOTICE
When circulation in each or certain space heating loops is
controlled by remotely controlled valves, it is important that
the minimum flow rate is guaranteed, even if all valves are
closed. In case the minimum flow rate cannot be reached,
a flow error 7H will be generated (no heating or operation).
See the installer reference guide for more information.
Minimum required flow rate during defrost/backup heater
operation
04+08 models 12l/min
16 model 15l/min
See the recommended procedure as described in "6.2 Checklist
during commissioning"on page19.
3.3 Preparing electrical wiring
3.3.1 Overview of electrical connections for
external and internal actuators
Item Description Wires Maximum
running
current
Outdoor unit and indoor unit power supply
1 Power supply for
outdoor unit
2+GND or
3+GND
(a)
2 Power supply and
interconnection cable to
indoor unit
3
(c)
3 Power supply for
backup heater
See table below. —
4 Preferential kWh rate
power supply (voltage
free contact)
2
(d)
5 Normal kWh rate power
supply
2 6.3A
User interface
6 User interface 2
(e)
Optional equipment
11 Power supply for
bottom plate heater
2
(b)
12 Room thermostat 2 or 3 100mA
(b)
13 Outdoor ambient
temperature sensor
2
(b)
14 Indoor ambient
temperature sensor
2
(b)
15 Heat pump convector 2 100mA
(b)
Field supplied components
16 Shut-off valve 2 100mA
(b)
17 Electricity meter 2 (per meter)
(b)
18 Domestic hot water
pump
2
(b)
19 Alarm output 2
(b)
20 Changeover to external
heat source control
2
(b)
21 Space heating
operation control
2
(b)
Item Description Wires Maximum
running
current
22 Power consumption
digital inputs
2 (per input
signal)
(b)
23 Safety thermostat for
the main zone
2
(b)
24 Safety thermostat for
the additional zone
2
(d)
(a) Refer to name plate on outdoor unit.
(b) Minimum cable section 0.75mm².
(c) Cable section 2.5mm².
(d) Cable section 0.75mm² till 1.25mm²; maximum length:
50m. Voltage-free contact shall ensure the minimum
applicable load of 15VDC, 10mA.
(e) Cable section 0.75mm² till 1.25mm²; maximum length:
500m. Applicable for both single user interface and dual
user interface connection.
NOTICE
More technical specifications of the different connections
are indicated on the inside of the indoor unit.
NOTICE
A safety thermostat (normal closed contact) MUST be
installed for the main zone. See "4.5.12 To connect the
safety thermostat (normal closed contact)"on page11.
Backup heater
type
Power supply Required number of
conductors
*3V 1× 230V 2+GND
4 Installation
4.1 Opening the units
4.1.1 To open the indoor unit
1 Loosen and remove the screws at the bottom of the unit.
2 Push on the button at the bottom of the front plate.
WARNING: Sharp edges
Take the front plate on the upper part instead of the lower
part. Watch your fingers, there are sharp edges on the
lower part of the front plate.
3 Slide the front panel of the unit downwards and remove it.
CAUTION
The front panel is heavy. Be careful NOT to jam your
fingers when opening or closing the unit.
4 Loosen and remove the 4 screws that fix the top panel.
5 Remove the top panel from the unit.

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