Maintenance - Mark Gs+ 35 Technisches Handbuch

the CO2 when the appliance is operating at high output. If the CO2 is too high, turn the throttle
adjuster to the right (less gas). If the CO2 is too low, turn the screw to the left (more gas). The
correct CO2 value is shown in table [3] (E1).
Step 2
Set the appliance to minimum load by setting the target temperature on the room controller to a
value close to the prevailing temperature, or by applying 2 VDC to the 0 – 10 VDC input. Check
the CO2 against the value in table [3] (E2). If different, correct by turning the offset adjuster under
the cap. To the left for lower CO2, to the right for higher CO2.
Legend [6]
1 Measuring point for gas pre-pressure
2 Measuring point for offset
3 Offset adjustment screw
4 Throttle adjustment screw
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.
The gas transport section can be removed from the appliance as a single assembly. To do so, six
M6 nuts must be removed and the electrical wiring disconnected.
– Removal of the gas transport section provides access to the burner and the ignition/ionisation
electrode. Any oxidation on the electrode tips must be removed.
– Check the burner surface for irregularities. Never use a steel brush!
– Clean the gas mixer using a soft brush. Make sure that no dust gets into the burner and the gas
suction tube. Refit the gas transport section, reconnect the wiring and the gas and electrical
supplies.
– The flue collector chamber is located under the flue gas pipe. Remove the clamping strip to gain
access to the heat exchanger.
EN
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