Daikin Altherma 3 R F Installer's Reference Manual page 135

ERLA03DAV3 + EHFH03S18DJ3V
Daikin Altherma 3 R F
4P596806-1 – 2019.10
When the outdoor temperature is between the space cooling On and the space
heating OFF temperature, the operation mode remains unchanged unless the
system is configured in room thermostat control with one leaving water
temperature zone and quick heat emitters. In that case, the operation mode will
change based on:
▪ Measured indoor temperature: besides the heating and the cooling desired 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: the
desired room temperature in heating is 22°C and in cooling 24°C, with a
hysteresis value of 1°C and an offset of 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 25°C) and the desired
heating temperature added by the offset value (thus 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 21°C) and the desired cooling temperature subtracted by
the offset value (thus 20°C).
▪ Guard timer to prevent too frequent changing from heating to cooling and vice
versa.
Changeover settings related to the outdoor temperature (ONLY when automatic is
selected):
# Code
[A.3.3.1] [4-02]
[A.3.3.2] [F-01]
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.
N/A [4-0B]
N/A [4-0D]
Description
Space heating OFF temp. If the outdoor
temperature rises above this value, the operation
mode will change to cooling:
▪ 14°C~35°C
Space cooling On temp. If the outdoor
temperature drops below this value, the
operation mode will change to heating:
10°C~35°C
Hysteresis: Ensures that changeover is ONLY
done when necessary. Example: The space
operation mode ONLY changes from cooling to
heating when the room temperature drops
below the desired heating temperature
subtracted by the hysteresis.
1°C~10°C
Offset: Ensures that the active desired room
temperature can be reached. Example: if heating
to cooling changeover would occur below the
desired room temperature in heating, this
desired room temperature could never be
reached.
1°C~10°C
9 Configuration
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Installer reference guide
135