Daikin EWYA004D2V3P Installer's Reference Manual page 149

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
Operation range
Depending on the average outdoor temperature, the operation of the unit in space
heating or space cooling is prohibited.
# Code
[4.3.1] [4-02]
[4.3.2] [F-01]
(a)
This setting is also used in automatic heating/cooling changeover.
NOTICE
Maximum value [4-02]. For models without integrated backup heater:
▪
Default value [4‑02]=22°C. You can change this value, but do NOT exceed the
maximum value.
▪
If the external backup heater kit is installed: Maximum value [4‑02]=35°C
▪
If the external backup heater kit is NOT installed: Maximum value [4‑02]=25°C
Exception: If the system is configured in room thermostat control with one leaving
water temperature zone and quick heat emitters, the operation mode will change
based on the measured indoor temperature. Besides the desired heating/cooling
room temperature, the installer sets a hysteresis value (e.g. when in heating, this
value is related to the desired cooling temperature) and an offset value (e.g. when
in heating, this value is related to the desired heating temperature).
Example: A unit is configured as following:
▪ Desired room temperature in heating mode: 22°C
▪ Desired room temperature in cooling mode: 24°C
▪ Hysteresis value: 1°C
▪ Offset: 4°C
Changeover from heating to cooling will occur when the room temperature rises
above the maximum of the desired cooling temperature added by the hysteresis
value (thus 24+1=25°C) and the desired heating temperature added by the offset
value (thus 22+4=26°C).
Oppositely, changeover from cooling to heating will occur when the room
temperature drops below the minimum of the desired heating temperature
subtracted by the hysteresis value (thus 22–1=21°C) and the desired cooling
temperature subtracted by the offset value (thus 24–4=20°C)
Guard timer to prevent too frequent changing from heating to cooling and vice
versa.
# Code
Changeover settings related to the indoor temperature.
Only applicable when Automatic is selected and the system is configured in
room thermostat control with 1 leaving water temperature zone and quick heat
emitters.
Description
Space heating off temperature: When
the averaged outdoor temperature rises above
this value, space heating is turned off.
▪ 14°C~35°C
Space cooling off temperature: When
the averaged outdoor temperature drops below
this value, space cooling is turned off.
▪ 10°C~35°C
Description
11 Configuration
|
(a)
(a)
Installer reference guide
149