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46 | Gas adjustment
11.2
Installation location higher than 2000 feet (610 m)
above sea level
Input and output rates are reduced at higher altitudes due to thin air with
reduced oxygen levels.
The heat output is reduced by 3 % per 1000 ft (305 m).
The boiler is factory set for installation below 2000 feet (610 m) above
sea level.
▶ Correction of the fan speed curve of the burner:
Use service function 0.d to adjust the elevation setting ( page). sea
level ( page 44).
11.3
Checking and setting the gas-air ratio (CO
required
▶ Switch the appliance OFF using the ON/OFF switch.
▶ Remove the cover ( page 22).
▶ Switch the appliance ON using the ON/OFF switch.
▶ Open one of the flue gas test ports.
Fig. 56 Open one of the flue gas test ports
▶ Insert the probe approx. 2-3/4 inches (70 mm) into the test port and
seal around it.
▶ Press and hold the emissions test button
The supply temperature alternates on the display with
maximum set output in heating mode.
▶ Briefly press the emissions test button
The supply temperature alternates on the display with
maximum nominal output.
▶ Measure the CO
or O
level and the CO content of the flue gas
2
2
( Section 12).
6720872361 (2017/04)
or O
), if
2
2
6 720 641 933-79.1O
until it lights up.
=
.
=
▶ On the gas throttle, break the seal at the slot and remove the cap.
1 .
Fig. 57 Remove seal from the gas throttle
▶ Adjust the gas throttle to set the CO
nominal output according to the table 25.
Fig. 58 Set CO
or O
level for maximum nominal output
2
2
Maximum nominal
output
Gas type
CO
2
NG
9.4 %
LPG (propane)
11.0 %
Table 25 CO
or O
values at maximum and minimum nominal output
2
2
▶ Briefly press the emissions test button
The supply temperature alternates on the display with
minimum nominal output.
▶ Measure the CO
or O
level and the CO content of the flue gas
2
2
( Section 12).
2 .
6 7 2 0 6 1 2 6 5 9 - 3 7 . 1 R
or O
level for maximum
2
2
6 7 2 0 6 1 2 6 5 9 - 3 8 . 1 R
Minimum nominal
output
O
CO
O
2
2
2
4.0 %
8.6 %
5.5 %
4.2 %
10.4 %
5.1 %
.
=
Greenstar combi 100 p / 151 p
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