Daikin EHVH08SU23DA6V7 [7/36] Preparing water piping
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Daikin EHVH08SU23DA6V7 [7/36] Preparing water piping

Daikin EHVH08SU23DA6V7 [7/36] Preparing water piping
4 Installation
Installation manual
7
EHVH04+08SU18+23DA6V7
Daikin Altherma 3 R F
4P619456-1 – 2020.03
3.2 Preparing water piping
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
▪ Valve towards expansion vessel. The valve towards the
expansion vessel (if equipped) MUST be open.
3.2.1 To check the water volume and flow rate
Minimum water volume
For EHVH*, there are no requirements for the minimum water
volume.
For EHVX*, check that the total water volume in the installation is
minimum 10litres.
NOTICE
When circulation in each space heating/cooling loop is
controlled by remotely controlled valves, it is important that
the minimum water volume is guaranteed, even if all of the
valves are closed.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in
all conditions. This minimum flow rate is required during defrost/
backup heater operation. For this purpose, use the overpressure
bypass valve delivered with the unit.
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
12l/min
See the recommended procedure as described in "6.2 Checklist
during commissioning"[424].
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
(a)
2 Power supply and
interconnection cable to
indoor unit
3
(b)
3 Power supply for
backup heater
See table below. —
4 Preferential kWh rate
power supply (voltage
free contact)
2
(c)
5 Normal kWh rate power
supply
2 6.3A
Optional equipment
Item Description Wires Maximum
running
current
6 User interface used as
room thermostat
2
(d)
7 Room thermostat 3 or 4 100mA
(e)
8 Outdoor ambient
temperature sensor
2
(e)
9 Indoor ambient
temperature sensor
2
(e)
10 Heat pump convector 2 100mA
(e)
Field supplied components
11 Shut-off valve 2 100mA
(e)
12 Electricity meter 2 (per meter)
(e)
13 Domestic hot water
pump
2
(e)
14 Alarm output 2
(e)
15 Changeover to external
heat source control
2
(e)
16 Space cool/heat
operation control
2
(e)
17 Power consumption
digital inputs
2 (per input
signal)
(e)
18 Safety thermostat 2
(c)
(a)
Refer to the nameplate of the outdoor unit.
(b)
Cable section 1.5mm.
(c)
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.
(d)
Cable section 0.75mm² till 1.25mm²; maximum length: 500m.
(e)
Minimum cable section 0.75mm².
NOTICE
More technical specifications of the different connections
are indicated on the inside of the indoor unit.
Backup heater
type
Power supply Required number of
conductors
*6V 1N~ 230V (6V) 2+GND
3~ 230V (6T1) 3+GND
4 Installation
4.1 Opening the units
4.1.1 To open the indoor unit
Overview
a
b
d
c
e
a Top panel
b User interface panel
c Switch box cover
d Front panel
e High voltage switch box cover
Open
1 Remove the top panel.

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