Daikin EWYA004D2V3P Installer's Reference Manual page 141

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
▪ the desired weather-dependent temperatures (if weather-dependent is enabled)
Moreover, with Modulation enabled, the desired leaving water temperature is
lowered or raised in function of the desired room temperature and the difference
between the actual and the desired room temperature. This results in:
▪ stable room temperatures, exactly matching the desired temperature (higher
comfort level)
▪ less on/off cycles (lower noise level, higher comfort and higher efficiency)
▪ water temperatures as low as possible to match the desired temperature (higher
efficiency)
If Modulation is disabled, set the desired leaving water temperature via [2] Main
zone.
# Code
[2.C.1] [8‑05]
[2.C.2] [8‑06]
INFORMATION
When leaving water temperature modulation is enabled, the weather‑dependent
curve needs to be set to a higher position than [8-06] plus the minimum leaving
water temperature setpoint required to reach a stable condition on the comfort
setpoint for the room. To increase efficiency, modulation can lower the leaving water
setpoint. By setting the weather‑dependent curve to a higher position, it cannot drop
below the minimum setpoint. See the illustration below.
T t
+[8-06]
−[8-06]
a Weather-dependent curve
b Minimum leaving water temperature setpoint required to reach a stable condition
on the comfort setpoint for the room.
WD curve type
The weather-dependent curve can be defined using the 2-points method or the
Slope-Offset method.
See "11.5.2 2-points curve" [
# Code
[2.E] N/A
Modulation:
▪ 0 No (disabled)
▪ 1 Yes (enabled)
Note: The desired leaving water temperature
can only be read out on the user interface.
Max modulation:
▪ 0°C~10°C
This is the temperature value by which the
desired leaving water temperature is increased or
decreased.
a
b
T a
4
124] and "11.5.3 Slope-offset
▪
2-points
▪ Slope-Offset
11 Configuration
|
Description
4
curve" [ 125].
Description
Installer reference guide
141