8 Configuration
Installation manual
30
EWAA004~008D2 + EWYA004~008D2
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688014-1A – 2022.05
NOTICE
If you add glycol to the water, you also need to install a
flow switch (EKFLSW2).
8.2.4
Configuration wizard: Backup heater
INFORMATION
Restriction:
Backup heater settings are only applicable in
case the optional external backup heater kit is installed.
The backup heater is adapted to be connected to most common
European electricity grids. If the backup heater is available, the
voltage, configuration and capacity must be set on the user
interface.
The capacities for the different steps of the backup heater must be
set for the energy metering and/or power consumption control
feature to work properly. When measuring the resistance value of
each heater, you can set the exact heater capacity and this will lead
to more accurate energy data.
Backup heater type
#
Code
Description
[9.3.1]
[E‑03]
▪ 0:
No heater
▪ 1:
External heater
Voltage
#
Code
Description
[9.3.2]
[5‑0D]
▪ 0:
230V, 1ph
▪ 2:
400V, 3ph
Configuration
The backup heater can be configured in different ways. It can be
chosen to have a 1-step only backup heater or a backup heater with
2 steps. If 2 steps, the capacity of the second step depends on this
setting. It can also be chosen to have a higher capacity of the
second step in emergency.
#
Code
Description
[9.3.3]
[4‑0A]
▪ 0: Relay 1
▪ 1: Relay 1 / Relay 1+2
▪ 2: Relay 1 / Relay 2
▪ 3: Relay 1 / Relay 2
Emergency
Relay
1+2
INFORMATION
Settings [9.3.3] and [9.3.5] are linked. Changing one
setting influences the other. If you change one, check if the
other is still as expected.
INFORMATION
During normal operation, the capacity of the second step of
the backup heater at nominal voltage is equal to
[6‑03]+[6‑04].
INFORMATION
If [4‑0A]=3 and emergency mode is active, the power
usage of the backup heater is maximal and equal to
2×[6‑03]+[6‑04].
Capacity step 1
#
Code
Description
[9.3.4]
[6‑03]
▪ The capacity of the first step of the
backup heater at nominal voltage.
Additional capacity step 2
#
Code
Description
[9.3.5]
[6‑04]
▪ The capacity difference between the
second and first step of the backup
heater at nominal voltage. Nominal
value depends on backup heater
configuration.
8.2.5
Configuration wizard: Main zone
The most important settings for the main leaving water zone can be
set here.
Emitter type
Heating up or cooling down the main zone can take longer. This
depends on:
▪ The water volume of the system
▪ The heater emitter type of the main zone
The setting
Emitter type
can compensate for a slow or a quick
heating/cooling system during the heat up/cool down cycle. In room
thermostat control,
Emitter
type
influences the maximum
modulation of the desired leaving water temperature, and the
possibility for usage of the automatic cooling/heating changeover
based on the indoor ambient temperature.
It is important to set
Emitter type
correctly and in accordance with
your system layout. The target delta T for the main zone depends on
it.
#
Code
Description
[2.7]
[2‑0C]
▪ 0:
Underfloor heating
▪ 1:
Fancoil unit
▪ 2:
Radiator
The setting of the emitter type has an influence on the space heating
setpoint range and the target delta T in heating as follows:
Description
Space heating
setpoint range
Target delta T in
heating
0:
Underfloor
heating
Maximum 55°C
Variable
1:
Fancoil unit
Maximum 55°C
Variable
2:
Radiator
Maximum 60°C
Fixed 8°C
NOTICE
Average
emitter
temperature
=
Leaving
water
temperature – (Delta T)/2
This means that for a same leaving water temperature
setpoint, the average emitter temperature of radiators is
lower than that of underfloor heating because of a bigger
delta T.
Example radiators: 40–8/2=
36°C
Example underfloor heating: 40–5/2=
37.5°C
To compensate, you can:
▪ Increase
the
weather-dependent
curve
desired
temperatures [2.5].
▪ Enable leaving water temperature modulation and
increase the maximum modulation [2.C].
Control
Define how the operation of the unit is controlled.
