Installer reference guide
19
08 + ERLQ004~008
Daikin Altherma - Low Temperature Split
4P313774-1 – 2012.05
5 Application guidelines
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. Example: The maximum power input depends on the
area of the house and an annual fee has to be paid to the electrical
company according to the size of the installed field fuse. By
permanently limiting the maximum power or current of the system,
you can install smaller field fuses.
Setup and configuration
Q
No additional equipment needed.
Q
Set the power consumption control settings in [A.7.2] via the
user interface (for the description of all settings, see
configuration chapter):
Q
Select full time limitation mode
Q
Select the type of limitation (power in kW or current in A)
Q
Set the desired power limitation level
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:
Q
Current (in A)
Q
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…).
Setup
Q
Demand PCB (option EKRP1AHTA) needed.
Q
Maximum four digital inputs are used to activate the
corresponding power limitation level:
Q
DI1 = strongest limitation (lowest energy consumption)
Q
DI4 = weakest limitation (highest energy consumption)
Q
For the specification and the connection of the digital inputs, see
technical data > wiring diagram.
Configuration
Set the power consumption control settings in [A.7.2] via the user
interface (for the description of all settings, see configuration
chapter):
Q
Select activation by digital inputs.
Q
Select the type of limitation (power in kW or current in A).
Q
Set the desired power limitation level corresponding to each
digital input.
5.6.3 Power limitation process
The outdoor unit has better efficiency than the electrical heaters.
Therefore, the electrical heaters are limited and turned OFF first. The
system limits power consumption in the following order:
1
Limits certain electrical heaters.
2
Turns OFF all electrical heaters.
3
Limits the outdoor unit
4
Turns OFF the outdoor unit.
NOTICE
When the current control is intended to reduce the installed
field fuse sizes, the field fuse will trip to protect the field
wires in case of overcurrents caused by the unit. Make sure
the selection of the field fuse complies with applicable
legislation.
P
i
Power input
t
Time
DI
Digital input (power limitation level)
a
Power limitation active
b
Actual power input
NOTICE
Mind the following guidelines when selecting the desired
power limitation level:
Q
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.
Q
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).
P
i
t
DI
a
b
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
P
i
Power input
t
Time
DI
Digital inputs (power limitation levels)
a
Power limitation active
b
Actual power input
If… has priority
Then set the heater priority
via the user interface to…
Domestic hot water production Booster heater.
Result: The backup heater will
be turned OFF first.
Space heating
Backup heater.
Result: The booster heater will
be turned OFF first.
a
b
c
A
B
C
D
1
2
3
4
5
A8P
P
i
t
DI1
DI3
DI4
a
b
Содержание EHBH04CA
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