COMMISSIONING
30 TECHNICAL DOCUMENTATION
SETTING THE CO
2
VALUE FOR THE ETHOS RANGE
• Any adjustments should only be carried out by competent persons.
• After adjustment of the gas valve the adjusters must be resealed.
There is a setting screw on the gas valve with which the CO
2
value can be set at maximum load. Set the boiler
at maximum load and check the CO
2
value. If necessary, adjust the flat setting screw; clockwise gives less
CO
2
, anti-clockwise gives more CO
2
.
There is a Torx setting screw on the gas valve with which the CO
2
value can be set at minimum load. Set the
boiler at minimum load and check the CO
2
value. If necessary, adjust the Torx setting screw; clockwise gives
more CO
2
, anti-clockwise gives less CO
2
.
After the CO
2
values have been set, they should be checked once again and corrected if necessary.
GAS VALVE:
FLUE GAS ANALYSER TEST POINT (ETHOS 90, 110 AND 130):
When setting the CO
2
levels on the boiler, the
readings can be taken from the flue gas
temperature sensor tapping. Disconnect the
electrical connection from the sensor. Unscrew the
sensor and remake the electrical connection.
Upon completion of tests, replace the flue gas
temperature sensor in reverse order to that
described above.
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