Power Limitation Process - Daikin EWYA004D2V3P Installer's Reference Manual

6.5.3 Power limitation process

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
P
i
a
DI1
DI3
DI4
P Power input
i
t Time
DI Digital inputs (power limitation levels)
a Power limitation active
b Actual power input
Setup
▪ Demand PCB (option EKRP1AHTA) needed.
▪ Maximum four digital inputs are used to activate the corresponding power
limitation level:
- DI1 = strongest limitation (lowest energy consumption)
- DI4 = weakest limitation (highest energy consumption)
▪ Specification of the digital inputs:
- DI1: S9S (limit 1)
- DI2: S8S (limit 2)
- DI3: S7S (limit 3)
- DI4: S6S (limit 4)
▪ Refer to the wiring diagram for more information.
Configuration
▪ Set the power consumption control settings in [9.9] via the user interface (for the
description of all settings, see
- Select limitation by digital inputs.
- Select the type of limitation (power in kW or current in A).
- Set the desired power limitation level corresponding to each digital input.
INFORMATION
In case more than 1 digital input is closed (at the same time), the digital input priority
is fixed: DI4 priority>...>DI1.
The outdoor unit has better efficiency than the backup heater. Therefore, the
backup heater is limited and turned OFF first. The system limits power
consumption in the following order:
1 Limits the backup heater.
2 Turns OFF the backup heater.
3 Limits the outdoor unit.
4 Turns OFF the outdoor unit.
Example
If the configuration is as follows: Power limitation level does NOT allow for backup
heater operation (step 1 and step 2).
Then power consumption is limited as follows:
b
t
"Power consumption
6 Application guidelines
|
4
control" [ 169]):
Installer reference guide
45