Daikin Altherma EHFH03S18D 3V Series Installer's Reference Manual page 144

10 | Configuration
Installer reference guide
144
Operation range
Depending on the average outdoor temperature, the operation of the unit in space
heating or space cooling is prohibited.
Space heating OFF temp: When the averaged outdoor temperature raises
above this value, space heating is turned OFF to avoid overheating.
# Code
[A.3.3.1] [4-02]
Space cooling On temp: When the averaged outdoor temperature drops
below this value, space cooling is turned OFF.
# Code
[A.3.3.2] [F-01]
Automatic heating/cooling changeover
Only applicable for models where cooling is possible. The end-user sets the desired
operation mode on the user interface: Heating, Cooling or Automatic (see also
operation manual/user reference guide). When Automatic is selected, the
changing of the operation mode is based on:
▪ Monthly allowance for heating and/or cooling: the end-user indicates on a
monthly base which operation is allowed ([7.5]: both heating/cooling or heating
ONLY or cooling ONLY). If the allowed operation mode changes to cooling ONLY,
the operation mode changes to cooling. If the allowed operation mode changes
to heating ONLY, the operation mode changes to heating.
▪ Averaged outdoor temperature: the operation mode will be changed in order to
ALWAYS be within range determined by the space heating OFF temperature for
heating and the space cooling On temperature for cooling. If the outdoor
temperature drops, the operation mode switches to heating and vice versa. Note
that the outdoor
4
"10 Configuration" [
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.
14°C~35°C
10°C~35°C
The same setting is also used in automatic
heating/cooling changeover.
temperature
116]).
Description
Description
will be time-averaged
ERLA03D + EHFH03S18D
4P596806-1C – 2022.09
(see
Daikin Altherma 3 R F