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7 Configuration
Leaving water temperature: Modulation
To allow better matching of the heat pump capacity with the actual
required capacity, enable the leaving water temperature modulation.
If modulation is enabled, the unit calculates the leaving water
temperature according to the difference between desired and actual
room temperature. As a result, the heat pump will have less start/
stop cycles and thus operate more economical.
If modulation is enabled, you can also set the maximum modulation
of the leaving water temperature. The maximum modulation is the
value by which the desired leaving water temperature is increased or
lowered.
#
Code
Modulated LWT:
[A.3.1.1.5]
[8-05]
▪ 0 (No): Disabled
▪ 1 (Yes): Enabled
N/A
[8-06]
Maximum modulation:
Range: 0°C~10°C
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. See
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.
T
Target leaving water temperature
t
T
Outdoor temperature
a
Leaving water temperature: Emitter type
Heating up or cooling down the main zone can take longer. This
depends on:
▪ The water volume of the system
▪ The heater emitter type of the main zone
The setting Emitter type can compensate for a slow or a quick
heating/cooling system during the heat up/cool down cycle. In room
thermostat control, the emitter type influences the maximum
modulation of the desired leaving water temperature, and the
possibility for usage of the automatic cooling/heating changeover
based on the indoor ambient temperature.
It is important to set the emitter type correctly and in accordance with
your system layout. The target delta T for the main zone depends on
it.
#
Code
Emitter type
[A.3.1.1.7]
[2-0C]
▪ 0: Underfloor heat
▪ 1: Fancoil unit
▪ 2: Radiator
Installation manual
22
Description
a
b
T a
Description
7.2.5
Domestic hot water control
#
Code
[A.4.1]
[6-0D]
Domestic hot water Type:
▪ 0
operation is allowed.
▪ 1 (Reheat + sched.): Same as 2, but
between the scheduled heatup cycles,
reheat operation is allowed.
▪ 2 (Scheduled
hot water tank can ONLY be heated
according to a schedule.
[A.4.5]
[6-0E]
The maximum temperature that users
can select for the domestic hot water.
You can use this setting to limit the
temperature at the hot water taps.
INFORMATION
There is a risk of space heating (or cooling) capacity
shortage/comfort problem when selecting [6‑0D]=0 ([A.4.1]
Domestic hot water Type=Reheat only).
In case of frequent domestic hot water operation, frequent
and long space heating interruption will happen.
7.2.6
Contact/helpdesk number
#
Code
[6.3.2]
N/A
Number that users can call in case of
problems.
7.3
Weather-dependent curve
7.3.1
What is a weather-dependent curve?
Weather-dependent operation
The unit operates 'weather-dependent' if the desired leaving water or
tank temperature is determined automatically by the outdoor
temperature. It therefore is connected to a temperature sensor on
the North wall of the building. If the outdoor temperature drops or
rises, the unit compensates instantly. Thus, the unit does not have to
wait for feedback by the thermostat to increase or decrease the
temperature of the leaving water or tank. Because it reacts more
quickly, it prevents high rises and drops of the indoor temperature
and water temperature at tap points.
Advantage
Weather-dependent operation reduces energy consumption.
Weather-dependent curve
To be able to compensate for differences in temperature, the unit
relies on its weather-dependent curve. This curve defines how much
the temperature of the tank or leaving water must be at different
outdoor temperatures. Because the slope of the curve depends on
local circumstances such as climate and the insulation of the house,
the curve can be adjusted by an installer or user.
Availability
The weather-dependent curve is available for:
▪ Main zone - Heating
▪ Main zone - Cooling
▪ Additional zone - Heating
▪ Additional zone - Cooling
▪ Tank
Description
(Reheat
only):
Only
reheat
only): The domestic
Description
EHFH03S18D
Daikin Altherma 3 R F
4P596803-1D – 2022.08
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