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9
Modulation
The gas wall heaters are units
with gas burner modulation which
makes operation with diverse
outputs between minimum and
maximum possible. The maximum
output serves to quickly raise the
room temperature when the units
are switched on.
With the modulation feature
by contrast, the required room
temperature can be maintained
at a constant level with constant
variation of the heat output
appropriate to actual demand.
With this automatic adjustment
of the heat output to the
room conditions, the physical
phenomena of layer formation (the
tendency of heat to rise) can be
restricted due to the reduction of
the air supply temperature.
The temperature differences per
metre are below 0.5°C.
When the units operate with a low
heat output, effi ciency above 94%
is achieved.
These results can only be achieved
by precise monitoring of the
climatic room conditions and
optimal control of the units.
For dimensioning heating centres
with hot air heaters, it is important
to observe the number of hourly
air exchanges.
In this respect, the following
should be noted:
Wall gas heaters should generally
be dimensioned so that the air
ow rate ensures a minimum of
two air exchanges per hour, even
if this is unnecessary for the heat
output.
The units have a room temperature
sensor NTC1 located at the rear
of the unit as standard so that
the temperature of the air sucked
in by the circulation air fans is
monitored.
Modulation takes place depending
on the value measured by this
sensor in a ratio to the value preset
on the microprocessor on the
control board.
Optimisation of the modulation
temperature value must take place
during operation of the system and
depends on the distance of the hot
air heater from the ground and
required temperature conditions.
The wall gas heater is normally
installed at a distance of 2.5 to 4 m
from the ground.
This ensures that the required
comfort temperature is reached
and maintained, whereby it is
important that the units are
operated at the lowest possible
modulation temperature which
is necessary to maintain these
conditions.
The modulation temperature (REG
SAN value) is factory set at 21°C.
This value allows an average
installation range between 3 and
5 metres at room temperatures
between 17 and 19°C
(see graph below).
Nominal
value at a
height of
1.5 m
Unit installation
height in metres
2.5 3 4 5
15° 16° 17° 18° 19°
16° 17° 18° 19° 20°
17° 18° 19° 20° 21°
18° 19° 20° 21° 22°
19° 20° 21° 22° 23°
20° 21° 22° 23° 24°
Kurve 1:1
korrigierte Kurve
Luftdruck (-durchsatz)
Gasdruck (-durchsatz)
90
91
92
93
94
95
96
65 70 75 80 85 90 95 100
Wärmedurchsatz [%]
Wirkungsgrad %
18
20
22
24
26
28
Wirkungsgrad
D Luft
t
D Zuluft
t
ATTENTION
Unit parameters can only be changed in conjunction with the elec-
tronic temperature control ATR-6.
The above diagram shows the effi ciency
and temperature difference of the air
supply with a reduction of the heat
throughput.
Effi ciency
Supply air
Gas pressure (fl ow rate)
Corrected curve
Curve 1:1
Air pressure (fl ow rate)
Air
Heat throughput [%]
Effi ciency %
9


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