Mark GSW+ 30, Техническое руководство

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5.2 Adjustment of the combustion
The commissioning of the gas valve must be done by a qualified professional equipped with a flue gas
analyzer. Before any intervention you must turn the gas and electrical supplies off. State on the type plate
(inside of the door) the gas type being tuned in if the unit was tuned into another gas type. Check the
tightness of the gas circuit after each intervention.
Required tools:
– Hex key 2.5mm

balancing air-gas ratio full load (throttle);
– Hex key 4  balancing air-gas ratio minimum load (offset);
– Gas analyzer (CO ₂ /CO - gas temperature);
– Gas gauge maximum pressure 50 mBar.
Controlling and regulating procedure of the burner with premix:
1 Place your flue gas analyzer in the flue;
2 Check the pressure of the gas supply before starting, when stopping and running (see table);
3 Turn the heater on:
– Start the unit in maximum power mode (see description “service menu” of the Comtherm);
– Check that the O
2
value corresponds with the table below, after the unit has been in operation for at
least 2 minutes;
– If necessary, correct the value with screw A. Turn clockwise to increase the O
2
value and counter
clockwise to decrease it;
– Continue with the minimum load (see description “service menu” of the Comtherm);
– If necessary, correct the measured value with screw B according to the table below. If necessary,
correct the value with screw A. Turn clockwise to decrease the O
2
value and counter clockwise to
increase it;
– Check the maximum and minimum load again. If there are no abnormalities, set the Comtherm in the
desired mode.
Combustion air fan
Restriction ring
Gas mixer
Gas pipe
Burner controls
Throttle
Gauge
Gas type Gas pressure Minimum pressure O
2
full load
(screw A)
O
2
minimum load
(screw B)
CO max PPM
G20/G25 G31
G20 (natural gas) 20-50 mbar Min. 18 mbar 5% 6% 160 200
G25 (natural gas) 25-50 mbar Min. 20 mbar 5% 6% 160 200
G31 (propane) 28-50 mbar Min. 25 mbar 5% 6% 160 200
Venture restriction ring color
Model GSW+ 30 GSW+ 40 GSW+ 50 GSW+ 70
Ring color / ø White / 6mm White / 6mm Red / - - / -
1
2
3
4
5
6
7
1 3 2 4 5 6 7
A - Full load setting
B - Minimum load setting