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Maximum space heating power setting
The maximum space heating power setting ( ) is factory set to 70%.
If more or less power is required, you can change the fan rpm. The
table below shows the relationship between the fan rpm and the
appliance power. It is strongly recommended NOT to modify this
setting.
Desired power (kW)
NHY2KOMB28AA
NHY2KOMB32AA
23.1
26.6
20.1
22.4
17.4
19.2
14.6
16.0
11.8
12.8
7.7
8.0
A minimum flow rate must be guaranteed so that the boiler does not
go in high temperature error. This can be maintained by opening the
radiator valves if there are any closed, or adding an appropriate by-
pass way in between space heating outlet and space heating inlet of
the boiler if thermostatic valves are fitted to all radiators.
Minimum required flow rate values for corresponding set powers are
given in the table below.
Minimum flow rate
(l/min)
2.6
4.0
8.5
12.5
Note that for the gas boiler the power during burning is increased
slowly and is reduced as soon as the supply temperature is reached.
Frost protection function
The boiler is equipped with an internal frost protection function that
automatically operates when necessary, even if the boiler is turned
off. If the heat exchanger temperature drops too low, the burner will
switch on until the temperature is sufficiently high again. When frost
protection is active, is displayed on the service display.
To change to a different type of gas
CAUTION
Work on gas carrying parts may ONLY be carried out by a
qualified competent person. ALWAYS comply with local
and national regulations. The gas valve is sealed. In
Belgium, any modifications to the gas valve MUST be
performed
by
a
certified
manufacturer. For more information, contact your dealer.
If a different type of gas is connected to the appliance than that for
which the appliance has been set by the manufacturer, the gas
metering MUST be replaced. Conversion sets for other types of gas
are available to order. See
"6.3.3 Possible options for the gas
boiler" on
page 14.
1 Switch the boiler off and isolate the boiler from the mains
power.
2 Close the gas tap.
3 Remove the front panel from the appliance.
4 Unscrew the coupling (a) above the gas valve and twist the gas
mixing tube towards the rear (b).
5 Replace the O-ring (c) and the gas restriction (d) with the rings
from the conversion set.
6 Reassemble in reverse sequence.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
Setting on service
display (% of max.
rpm)
85
70
60
50
40
25
Set power (kW)
5.4 kW
8.5 kW
17.8 kW
26.2 kW
representative
of
the
7 Open the gas tap.
8 Check the gas connections before the gas valve for
gastightness.
9 Switch on the mains power.
10 Check the gas connections after the gas valve for gastightness
(during operation).
11 Now check the setting of the CO
in display) and low setting ( in display).
12 Put a sticker indicating the new gas type on the bottom of the
gas boiler, next to the nameplate.
13 Put a sticker indicating the new gas type next to the gas valve,
over the existing one.
14 Put the front panel back in its place.
b
a
a
Coupling
b
Gas mixing tube
c
O-ring
d
Gas metering ring
INFORMATION
The gas boiler is configured for operation with gas type
G20 (20 mbar). However, if the gas type present is G25
(25 mbar), the gas boiler can still be operated without
modification.
About the carbon dioxide setting
The CO
setting has been set in the factory and in principle requires
2
no adjustments. The setting can be checked by measuring the CO
percentage in the combustion gases. In case of possible disturbance
of the adjustment, replacement of the gas valve or conversion to
another gas type the adjustment must be checked and if necessary
set according to the instructions below.
Always check the CO
percentage when the cover is open.
2
To check the carbon dioxide setting
1 Switch off the heat pump module with the user interface.
10 Configuration
percentage at high setting (
2
c
d
Installer reference guide
75
2
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