Mark GSE Serie Livret Technique page 8

Clean the air discharge louvers and casing.
Minimum/maximum and/or safety thermostat:
Check the position of thermostat bulb (no metal-on-metal contact with heat exchanger centrally
between elements).
Flue gas fan.
Remove the inspection cover. Check bypass and fan restriction for soot and dust. Remove soot
and dust with a brush. For restriction diameters see [3].
Vee-belt transmission for type G(N)CE.
Check fan wheel(s) and belt tension; clean wheel(s) if necessary. Check belt tension after 20 to 40
hours in operation. Re-tension regularly in the first year of operation [13].
After cleaning the appliance, put it back into operation again as set out in Chapter 3.
5.0 Description of components
5.1 Automatic burner control and gas valve [6]
SIT DBC burner control order code 06 08 052 in all appliances.
SIT Sigma 840 order code 0608050 in appliances 18, 21, 24, 28, 33, 37, 44, 49, 55 and 59. SIT Nova
822 order code 0608057 in appliances 66, 74, 88, 98, 104.
Safety shut-off valve consisting of a servo-operated safety shut-off valve with a gas pressure
regulator responsible for constant gas pressure to the main burners.
B Adjusting screw pressure regulator
C Cable connections
D Pressure gauge nipple for intake pressure
E Intake or exhaust
Gas regulator [7] consisting of a servo-operated gas pressure regulator order code 0608025 and
separate safety shut-off valve order code 0607090. Only in appliances 98 and 104 in DE, BE and NL
5.2 Ionisation and ignition [8]
Ionisation electrode order code 06 25 349
Ignition electrode order code 06 25 346
C Burner box
D Burner bar
5.3 Thermostat combination [9]
A One safety thermostat (STB) order code 31 01 655
A safety thermostat is a thermostat with a fixed setting set above that of the maximum thermostat.
This thermostat switches the appliance off in the event of the maximum thermostat's mechanical
failure and overheating of the appliance. The thermostat should be reset following correction of
the fault after which the appliance will resume operation automatically (if heat is required at that
time). Set point: 110°C
B One minimum thermostat order code 31 01 930
The minimum thermostat is responsible for switching on the fan(s) after a certain amount of
heating-up time. The minimum thermostat is also responsible for post-ventilation, thus expelling all
of the heat present in the heat exchanger. Set point: 30°C.
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