Daikin Altherma EHVH08SU18CB6W Installer's Reference Manual page 57

# Code
[7.7.2.1] [0-00] << continuation
[0-01] ▪ [0-03]:
temperature. –40°C~+5°C (default: –
[0-02]
10°C)
[0-03]
▪ [0-02]:
temperature.
15°C)
▪ [0-01]:
temperature
temperature equals or drops below
the
[9‑05]°C~[9‑06]°C (default: 45°C).
Note: This value should be higher
than [0-00] as for low outdoor
temperatures
required.
▪ [0-00]:
temperature
temperature equals or rises above
the
[9‑05]°C~min(45, [9‑06])°C (default:
35°C).
Note: This value should be lower
than [0-01] as for high outdoor
temperatures less warm water is
required.
Leaving water temperature: Delta T source
Temperature difference for entering and leaving water. The unit is
designed to support under floor loops operation. The recommended
leaving water temperature (set by the user interface) for under floor
loops is 35°C. In such case, the unit will be controlled to realize a
temperature difference of 5°C which means that the entering water
to the unit is around 30°C. Depending on the installed application
(radiators, heat pump convector, under floor loops) or situation, it
can be possible to change the difference between entering and
leaving water temperature. Note that the pump will regulate its flow
to keep the Δt.
# Code
[A.3.1.3.1] [9-09] Heating: required temperature
difference between entering and
leaving water. Range: 3°C~10°C (in
steps of 1°C; default value: 5°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)
ERLQ004~008CA + EHVH04+08SU18+26CB6W
Daikin Altherma – Low temperature split
4P449978-1B – 2018.07
Description
Low outdoor ambient
High outdoor ambient
10°C~25°C (default:
Desired leaving water
when the outdoor
low ambient temperature.
warmer water
Desired leaving water
when the outdoor
high ambient temperature.
Description
exactly matching the desired
# Code
[A.3.1.1.5] [8-05]
is
N/A [8-06]
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.
Leaving water temperature: Emitter type
Only applicable in case of room thermostat control. Depending on
the system water volume and the heat emitters type, the heat up of a
space can take longer. This setting can compensate for a slow or a
quick heating system during the heat up cycle.
Note: The setting of the emitter type will influence the maximum
modulation of the desired leaving water temperature.
Therefore it is important to set this correctly.
# Code
[A.3.1.1.7] [9-0B]
8 Configuration
Description
Modulated LWT:
▪ No (default): disabled.
Note: The desired leaving water
temperature needs to be set on the
user interface.
▪ 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
Leaving water temperature maximum
modulation:
0°C~10°C (default: 3°C)
Requires modulation to be enabled.
This is the value by which the desired
leaving water temperature is increased
or lowered.
a
b
T a
Description
Emitter type:
Reaction time of the system:
▪ Quick Example: Small water volume
and fan coils.
▪ Slow Example: Large water volume,
floor heating loops.
Installer reference guide
57