Mark GS+ Livret Technique page 12

combustion values are set during this procedure. If checks indicate that the CO
from that in table [3], adjustments may be made (difference of more than 0.2%). Never adjust set
screws without the correct measuring equipment.
Legend [6]
1 Measuring point for gas pre-pressure
2 Measuring point for offset
3 Offset adjustment screw
4 Throttle adjustment screw
Step 1
Set the appliance to run at full operational load by pressing and holding the reset button of the unit
for at least 5 seconds. The fault lamp in the reset button flashes at a high frequency. Check the CO
when the appliance is operating at high output. If the CO
the right (less gas). If the CO
value is shown in table [3] (E1).
Step 2
Set the appliance to minimum load by shortly pressing the reset button of the unit. The fault lamp
in the reset button flashes at a low frequency. Check the CO
different, correct by turning the offset adjuster under the cap. To the left for lower CO
for higher CO .
2
After setting the gas control unit press the reset button again (the light goes out).
4.7 Shutting down the heater
For short periods of time:
– Set the room thermostat to the minimum temperature.
– Do not switch off the electricity supply at the main switch as this may damage the maximum
temperature and safety thermostat.
For longer periods of time:
– Set the room thermostat to the minimum temperature.
– After ± 5 minutes, the electrical power may be switched off.
5.0 Maintenance
5.1 General
The appliance must be subjected to maintenance at least once a year, more often if necessary. If
applicable, ask a qualified installer for maintenance advice. When carrying out maintenance, the
appliance must have been shut down for an extended period. Make sure that you comply with all
safety rules.
5.2 Cleaning
All gas-fired appliances require periodical maintenance. This maintenance work must be performed
by qualified maintenance technicians.
– Before starting maintenance work, the gas and electrical supplies must be shut off. See also
paragraph 4.7
– Check all gaskets and replace if required.
– The gas transport section is located on the side of the appliance in the electrical compartment.
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is too low, turn the screw to the left (more gas). The correct CO
2
is too high, turn the throttle adjuster to
2
against the value in table [3] (E2). If
2
value is different
2
2
2
, to the right
2