A.O. Smith BFC-120, Installation, User And Service Manual

Page: 76 / 126

Fig. CO
2
adjustment (full load)
IMD-1095b R0
Note
Turning to the left (anticlockwise) means more gas (higher CO
2
level) and turning to the
right (clockwise) means less gas (lower CO
2
level).
Note
Note
After conversion, you must check that the gas control valve is gastight.
If you have increased T
set
, set it back to the original value using [ ].
Continue with the CO
2
measurement under partial load.
SGS 80 to 120
If the measure value is within the range given in the table of CO
2
values:
If you have increased T
set
, set it back to the original value using [ ].
Continue with the CO
2
measurement under partial load.
If the measured value is not within the range of CO
2
values from the table, then you
may not start the appliance up:
Switch off the appliance.
Turn off the gas supply to the appliance.
Put the covers back on the appliance.
Contact the appliance's supplier.
Partial load measurement
From the service menu, select:
SERVICE OPERATION | PARTIAL LOAD
Confirm with [ENTER].
The appliance is now in PARTIAL LOAD mode and will ignite
The appliance is now running at PARTIAL LOAD. Read the value from the CO
2
meter
and wait until this measured value has remained stable for some time. This may take
several minutes.
Compare the CO
2
value measured against the value measured under full load.
The CO
2
value at partial load must be within ±0.3 vol% of the CO
2
value measured
or adjusted under full load.
If necessary, adjust the CO
2
value using the adjuster screw until the value is within
0.3 vol% of the CO
2
value under full load.
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76 Installation, Maintenance and Service part