Instructions condensing Air heaters type HR
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9
Adjusting the gas-control
In principle, it is
not
necessary to adjust the gas control after putting the unit into operation.
In case it needs to be adjusted, (e.g. after
fitting a new one), this must be done only by
a qualified person.
Only use calibrated
instruments !
A poor adjustment can lead
to overheating and / or production of the
poisonous carbon monoxide !.
There are two screws to adjust the gas
control, the Offset adjuster and the Ratio
adjuster.
The Offset adjuster is used in Low fire. The Ratio adjuster is used in High fire.
Put the heater into operation at high fire by pressing the service button first 10 seconds and
press again shortly. You see on display H/b.
If the heater does not ignite while sparking, you can, if necessary, close the air-openings of the
coloured ring on the gas-air mixer with thumb and forefinger during ignition. The mixture will
become richer and will ignite more easily.
Look for the correct CO2 values in the table with technical data.
Readjust the CO2 when the deviation is more then 0,3%
1
Check the CO2 in High fire
Decrease CO2
turn the Ratio adjuster to the right (less gas).
Increase the CO2
turn the Ratio adjuster to the left (more gas).
2 Then
check the CO2 in Low fire
. The CO2 in low fire is lower then the high fire CO2.
Decrease the CO2
turn the Offset adjuster to the left.
Increase the CO2
turn the Offset adjuster to the right
After adjusting the CO2 in Low fire, return to high fire, and Readjust the CO2 with the Ratio
adjuster.
Then return to Low fire again and eventually readjust the CO2 with the Offset adjuster.
Repeat these steps until both values are oké.
Never forget to check the CO (carbon monoxide ) production of the heater!!! Too much CO
means mostly that the mixture is too rich. CO value should always be below 100 ppm.
HR80, 100 & 120 CO2 adjustment
:
Check respectively at high and low level first heater 1 and adjust if necessary, then Heater 2
and adjust if necessary after this check then both heaters together.
10
Problem solving
10.1 General
When it turns out that the problem is
not
caused by the external circumstances (i.e. no electric
supply power or no gas), please take the following instructions into account. Please remember
the built in waiting times of the heater (do not react too soon!) and the signals of the LEDs and
the code on the display on the electronic circuit board.
Offset adj.
Ratio adj.
P out
P offset
P in