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INFORMATION
In order to optimise comfort as well as running costs, it is
recommended to choose weather-dependent setpoint
operation. Set the settings carefully; they have significant
influence on heat pump as well as boiler operation. Too
high leaving water temperature can result in constant boiler
operation.
NOTICE
In case of third-party gas boiler:
If you use weather-dependent operation, make sure to set
the values for the weather-dependent curves twice for
correct operation:
▪ Once on the user interface of the outdoor unit
▪ Once on the third-party gas boiler
Pump control
NHY2KOMB28+32AA gas
boiler
a
a Main pump (= inside the gas
boiler)
If...
Space heating is done
And...
by...
Outdoor unit only
[C-0B]=1 According to ΔT control (see
[C-0B]=0 At maximum pump speed.
Gas boiler only
(only applicable in case of
NHY2KOMB28+32AA gas boiler)
Combination of outdoor unit and
gas boiler
(only applicable in case of
NHY2KOMB28+32AA gas boiler)
Field setting [C-0B] defines whether ΔT control is enabled. The main
pump will only run according to ΔT control if [C-0B] is set to 1 and
space heating is done by the outdoor unit only. If the pump runs
according to ΔT control:
If Emitter type [2-0C]=...
0: Underfloor heating
1: Fancoil unit
2: Radiator
Leaving water temperature: Modulation
Modulation lowers or raises the desired leaving water temperature in
function of the desired room temperature and the difference between
this temperature and the actual room temperature. This results in:
▪ stable
room
temperatures
temperature (high comfort level),
▪ less On/OFF cycles (low noise level, high comfort and efficiency
levels)
▪ as low as possible leaving water temperatures (high efficiency).
This function is only applicable in case of room thermostat control
and is used to calculate the leaving water temperature. After
activation, the leaving water temperature can only be read on the
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
Third-party gas boiler
a
a Main pump (= external pump)
Then the main pump runs...
below).
At maximum pump speed.
Then the target ΔT in heating
is...
Variable according to [1-0B].
Fixed (10°C).
exactly
matching
the
desired
user interface, but not changed. Turn OFF modulation to change it.
The leaving water temperature can either be a fixed setpoint, or an
offset in case of weather-dependent setpoint.
#
Code
[A.3.1.1.5]
[8‑05]
Modulated LWT:
▪ No: disabled.
Note: The desired leaving water
temperature needs to be set on the
user interface.
▪ Yes: enabled.
Note: The desired leaving water
temperature can only be read out on
the user interface
N/A
[8-06]
Leaving water temperature maximum
modulation:
Range: 0°C~10°C
Requires modulation to be enabled.
This is the value by which the desired
leaving water temperature is increased
or lowered.
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.
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]
Emitter type:
Reaction time of the system:
▪ Quick
volume, fan coils, or radiators.
▪ Slow Example: Large water volume,
floor heating loops.
Quick heat up function
Only applicable in case of room thermostat control. The function will
start up the gas boiler when the actual room temperature is 3°C
lower than the desired room temperature. The large boiler capacity
10 Configuration
Description
a
b
T a
Description
Example:
Small
water
Installer reference guide
61
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