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c. Fully open several hot water fixtures and set the boiler
to operate, and proceed Gas Setup Wizard.
For proceeding Gas Setup Wizard for gas type
Note
selection, refer to "10.3 Start-Up Wizard" on
page 62.
Measure the CO₂ value at low fire.
If the CO₂ value is not within 0.5% of the value listed in
Table 2, the gas valve set screw will need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 8. Using a
/
5
32
the set screw no more than
counterclockwise to lower the CO₂ value.
Figure 8. Set Screw Location
The set screw is located behind the screw-on
Note
cover. This must be removed first.
Model
Load
Max.
NCB700-2S+/42K
Min.
Max.
NCB700-3S/54K
Min.
in or 4 mm Allen wrench, turn
/
turn clockwise to raise or
1
4
Gas type
Output
Kcal/h
29,240
2,924
29,240
2,924
d. After Gas Setup Wizard is done, operate at 1-stage MIN
mode.
Note
e. Fully open several hot water fixtures and set the boiler
to operate at 2-stage D. MAX mode (refer to "10.7.5
Setting the Special Operation Modes" on page 73).
Measure the CO₂ value at high fire.
If the CO₂ values do not match Table 2 at high fire,
do not adjust the gas valve. Check for the proper Gas
Orifice.
DANGER
Improper gas valve settings can cause severe personal injury
or substantial property damage.
Consumption
kW
kW
34
35
3.4
3.5
34
35
3.4
3.5
For operation mode selection, refer to "10.7.5
Setting the Special Operation Modes" on
page 73.
G20
[20 mbar]
Gas flow
m
/h
3
3.33
0.33
3.33
0.33
G31
[37 mbar]
Gas flow
m
/h
3
1.32
0.13
1.32
0.13
Appendices
89
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