Instructions condensing Air heaters type XR version XR-GB-4001-a
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6.3 Start through the display in the heater
The manual test mode trough the display in the heater will only work for maximum 10 minutes.
1. Pres and hold the Return and – button for a few seconds. The display will show Lo / St
intermediate.
2. The heater will start up in Low fire.
3. Toggle between Low and High fire by pressing the + and – button,
4. Exit the service menu by pressing the – button until 0 is displayed.
5. The heater will always cool down the heat exchanger for a few minutes.
6. After 10 minutes the test mode will automatically end.
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 through the display in the heater, Mode 4.
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 CO
2
values in the table with technical data.
Readjust the CO
2
when the deviation is more then 0,3%
1
Check the CO
2
in High fire (mode 4)
Decrease CO
2
turn the Ratio adjuster to the right (less gas).
Increase the CO
2
turn the Ratio adjuster to the left (more gas).
2 Then
check the CO
2
in Low fire. (mode 2)
The CO
2
in low fire is lower than the high fire
CO
2
.
Decrease the CO
2
turn the Offset adjuster to the left.
Increase the CO
2
turn the Offset adjuster to the right
After adjusting the CO
2
in Low fire, return to high fire, and Readjust the CO
2
with the Ratio
adjuster.
Then return to Low fire again and eventually readjust the CO
2
with the Offset adjuster.
Offset adj.
Ratio adj.
P out
P offset
P in
