Daikin EHVH08SU26CB6W [21/108] Application guidelines
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Daikin EHVH08SU26CB6W [21/108] Application guidelines

Daikin EHVH08SU26CB6W [21/108] Application guidelines
5 Application guidelines
Installer reference guide
21
ERLQ004~008CA + EHVH04+08SU18+26CB6W
Daikin Altherma – Low temperature split
4P449978-1 – 2016.06
▪ Power meter2:
▪ In case of a single-phase backup heater configuration, use a
single-phase power meter.
▪ In other cases, use a three-phase power meter.
Example
Single-phase outdoor unit with a three-phase backup heater:
e efe
ihg
j
A B C
b
a
d

c
5
8
0
1
5
0
0
0
5
8
0
1
5
0
0
0
A Outdoor unit
B Indoor unit
C DHW tank
a Electrical cabinet (L
1
/N): Preferential kWh rate power
supply
b Electrical cabinet (L
1
/L
2
/L
3
/N): Normal kWh rate power
supply
c Power meter (L
1
/N)
d Power meter (L
1
/L
2
/L
3
/N)
e Fuse (L
1
/N)
f Fuse (L
1
/L
2
/L
3
/N)
g Outdoor unit (L
1
/N)
h Indoor unit (L
1
/N)
i Backup heater (L
1
/L
2
/L
3
/N)
j Booster heater (L
1
/N)
5.6 Setting up the power consumption
control
▪ The power consumption control:
▪ Is only applicable for EHVH04+08.
▪ Allows you to limit the power consumption of the entire system
(sum of outdoor unit, indoor unit, booster heater, and backup
heater).
▪ Configuration: Set the power limitation level and how it has to
be achieved via the user interface.
▪ The power limitation level can be expressed as:
▪ Maximum running current (inA)
▪ Maximum power input (inkW)
▪ The power limitation level can be activated:
▪ Permanently
▪ By digital inputs
5.6.1 Permanent power limitation
Permanent power limitation is useful to assure a maximum power or
current input of the system. In some countries, legislation limits the
maximum power consumption for space heating and DHW
production.
P
i
t
DI
a
b
P
i
Power input
t Time
DI Digital input (power limitation level)
a Power limitation active
b Actual power input
Setup and configuration
▪ No additional equipment needed.
▪ Set the power consumption control settings in [A.6.3.1] via the
user interface (for the description of all settings, see
"8Configuration"on page48):
▪ Select full time limitation mode
▪ Select the type of limitation (power in kW or current in A)
▪ Set the desired power limitation level
NOTICE
Mind the following guidelines when selecting the desired
power limitation level:
▪ Set a minimum power consumption of ±3.6 kW to
guarantee defrost operation. Otherwise, if defrosting is
interrupted several times, the heat exchanger will
freeze up.
▪ Set a minimum power consumption of ±3 kW to
guarantee space heating and DHW production by
allowing at least one electrical heater (backup heater
step1 or booster heater).
5.6.2 Power limitation activated by digital
inputs
Power limitation is also useful in combination with an energy
management system.
The power or current of the entire Daikin system is limited
dynamically by digital inputs (maximum four steps). Each power
limitation level is set via the user interface by limiting one of the
following:
▪ Current (in A)
▪ Power input (in kW)
The energy management system (field supply) decides the activation
of a certain power limitation level. Example: To limit the maximum
power of the entire house (lighting, domestic appliances, space
heating…).
a
b
c
A B C
D
1
2
3
4
5
A8P
A Outdoor unit
B Indoor unit
C DHW tank
D Energy management system
a Power limitation activation (4 digital inputs)
b Backup heater
c Booster heater

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