Page 51
N
EO
T
HERM
Boilers and Water Heaters
Auto at the end of the test.
Manual in Run -
The Manual in Run control will only set the fan
speed when the control has proven flame and the
unit has entered the Run mode.
Manual in Run and Standby -
Using this setting, the manual control will set the
fan speed whether the boiler is operating or not.
For this test, select Manual in Run.
8. Type in a value for high fire RPM, which can be
found on the ‘Modulation Configuration’ screen
(see Section 8.7.7). (The actual RPM will not go
this high – the control will limit the fan speed to
the maximum set at the factory.)
By using the manual control, and entering a high
RPM value, this forces the burner to run at full
combustion so you can adjust the gas valve for the
correct CO
2
output.
Figure 41 shows the adjusting points on the gas
valve. Adjust the High Fire screw to get the
proper CO
2
level for high fire. See Table 16 and
Table 17. To raise the high fire CO
2
level, turn the
High Fire adjustment screw counter-clockwise.
To lower the high fire CO
2
level, turn the screw
clockwise.
9. Repeat step 8, except this time set the fan speed
RPM to 1200rpm. (Again, the actual RPM will not
go this low – the control will limit the fan speed to the
minimum set at the factory.) This will force the boiler
to operate in low fire. Adjust the Low Fire screw so
the CO
2
matches Table 16 and Table 17.
To raise the low fire CO
2
, turn the Low Fire
adjustment screw clockwise. To lower the low fire
CO
2
, turn the screw counter-clockwise.
10. The adjustment you made for the Low Fire setting
could affect the High Fire setting, so you need to
re-check the High Fire setting. Go back to the
Operations screen and set the Firing Rate back
to high fire. The CO
2
should still be about at the
level listed in Table 14 and Table 15. If the CO
2
is
not correct, repeat the steps listed above.
11. Set the Firing Rate back to 1200 RPM, and re-
check the CO
2
during Low Fire.
12. Once the CO
2
values are correct for both High Fire
and Low Fire, go back to the Operation screen and
select Automatic operation. At this point, you have
set up the burner for this boiler.
Summary of Contents for NTV
Page 4: ...LAARS Heating Systems...
Page 11: ...Page 7 NEOTHERM Boilers and Water Heaters...
Page 24: ...Page 20 LAARS Heating Systems Figure 16 Hydronic Piping Single Boiler Zoning with Circulators...
Page 84: ...Page 80 LAARS Heating Systems Parts Illustration 1 Jacket Components...
Page 86: ...Page 82 LAARS Heating Systems Parts Illustration 4 Internal Components Sizes 750 850...
Page 88: ...Page 84 LAARS Heating Systems Parts Illustration 6 Gas Train Components Sizes 600 850...
Page 91: ...Page 87 NEOTHERM Boilers and Water Heaters Notes...
