Daikin Altherma EPGA16DAV3 Installer's Reference Manual page 50

8 Configuration
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 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 mode is 22°C
and in cooling mode it is 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 (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.
# 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.
N/A [4-0B] Hysteresis: Ensures that changeover is
ONLY done when necessary. The space
operation ONLY changes from heating to
cooling when the room temperature rises
above the desired cooling temperature
added by the hysteresis value.
▪ Range: 1°C~10°C
N/A [4-0D] Offset: Ensures that the active desired
room temperature is always reached. In
heating mode, the space operation
ONLY changes when the room
temperature rises above the desired
heating temperature added by the offset
value.
▪ Range: 1°C~10°C
Number of zones
The system can supply leaving water to up to 2 water temperature
zones. During configuration, the number of water zones must be set.
# Code
[4.4] [7‑02] ▪ 0: Single zone
Only one leaving water temperature
zone:
▪ a: Main LWT zone
Installer reference guide
50
Description
Description
a
# Code
[4.4] [7‑02] ▪ 1: Dual zone
Two leaving water temperature zones.
The main leaving water temperature
zone consists of the higher load heat
emitters and a mixing station to
achieve the desired leaving water
temperature. In heating:
▪ a: Additional LWT zone: Highest
▪ b:
CAUTION
If there are 2 zones, it is important that the zone with the
lowest water temperature is configured as the main zone,
and the zone with the highest water temperature is
configured as the additional zone. Not configuring the
system in this way could cause damage to the heat
emitters.
CAUTION
If there are 2 zones and the emitter types are wrongly
configured, water of high temperature can be sent towards
a low temperature emitter (underfloor heating). To avoid
this:
▪ Install an aquastat/thermostatic valve to avoid too high
temperatures towards a low temperature emitter.
▪ Make sure you set the emitter types for the main zone
[2.7] and for the additional zone [3.7] correctly in
accordance with the connected emitter.
Pump operation mode
When the space heating/cooling operation is OFF, the pump is
always OFF. When space heating/cooling operation is ON, you have
the choice between these operation modes:
# Code
[4.5] [F–0D] Pump operation mode:
▪ 0
operation, regardless of thermo ON or
OFF condition. Remark: Continuous
pump operation requires more energy
than
operation.
b
b
▪ a: Space heating/cooling control
▪ b: Off
▪ c: On
▪ d: Pump operation
EPGA11~16DAV3 + EAVZ16S18+23DA6V+9W
Description
a
b
temperature
Main LWT zone: Lowest
temperature
Description
Continuous: Continuous pump
sample or request pump
a
c
c
d
Daikin Altherma – Low temperature split
4P556075-1 – 2019.02