Daikin ERGA04DAV3A Installer's Reference Manual page 57

# Code
[2.B.1] [1‑0B] Delta T heating: A minimum temperature
difference is required for the good
operation of heat emitters in heating
mode.
▪ If [2-0C]=2, this is fixed to 10°C
▪ Else: 3°C~10°C
[2.B.2] [1‑0D] Delta T cooling: A minimum temperature
difference is required for the good
operation of heat emitters in cooling
mode.
▪ 3°C~10°C
Leaving water temperature: Modulation
Only applicable in case of room thermostat control. When using the
room thermostat functionality, the customer needs to set the desired
room temperature. The unit will supply hot water to the heat emitters
and the room will be heated. Additionally, also the desired leaving
water temperature must be configured: when turning on the
modulation, the desired leaving water temperature will be calculated
automatically by the unit (based on the preset temperatures, if
weather-dependent is selected, modulation will be done based on
the desired weather-dependent temperatures); when turning off the
modulation, you can set the desired leaving water temperature on
the user interface. Moreover, with the modulation turned on, 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
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)
# Code
[2.C.1] [8‑05] Modulation:
▪ 0 No: Disabled, the desired leaving
water temperature needs to be set on
the user interface.
▪ 1 Yes: Enabled, the leaving water
temperature is calculated according to
the difference between the desired
and the actual room temperature. This
creates a better match between the
capacity of the heat pump and the
actual required capacity, and results in
less start/stop cycles and a more
economic operation.
Note: The desired leaving water
temperature can only be read out on
the user interface.
[2.C.2] [8‑06] Max modulation:
▪ 0°C~10°C
This is the temperature value by which
the desired leaving water temperature is
increased or decreased.
Final English - Tanslations in progress
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA
Daikin Altherma – Low temperature split
4P495248-1 – 2017.12
Description
exactly matching the desired
Description
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. Refer
to 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.
Shut off valve
The following is only applicable in case of 2 leaving water
temperature zones. In case of 1 leaving water temperature zone,
connect the shut-off valve to the heating/cooling output.
The shut off valve for the main leaving water temperature zone can
close under these circumstances:
INFORMATION
During defrost operation, the shut-off valve is ALWAYS
opened.
During thermo: If [F‑0B] is enabled, the shut off valve closes when
there is no heating demand from the main zone. Enable this setting
to:
▪ avoid leaving water supply to the heat emitters in the main LWT
zone (through the mixing valve station) when there is request from
the additional LWT zone.
▪ activate the ON/OFF pump of the mixing valve station ONLY when
there is demand.
# Code
[2.D.1] [F-0B] The shut off valve:
▪ 0 No: is NOT influenced by heating or
cooling demand.
▪ 1 Yes: closes when there is NO
heating or cooling demand.
INFORMATION
The setting [F‑0B] is only valid when there is a thermostat
or external room thermostat request setting (NOT in case
of leaving water temperature setting).
During cooling: If [F‑0B] is enabled, the shut off valve closes when
the unit is running in cooling operation mode. Enable this setting to
avoid cold leaving water through the heat emitter and the forming of
condensation (e.g. under floor heating loops or radiators).
# Code
[2.D.2] [F-0C] The shut off valve:
▪ 0 No: is NOT influenced by changing
the space operation mode to cooling.
▪ 1
operation mode is cooling.
8 Configuration
a
b
T a
Description
Description
Yes: closes when the space
Installer reference guide
57