NTI FTVN150 - Adjust CO2 at Maximum Gas Flow

8
Part 3. Checking/Adjusting the CO2
2. Checking/Adjusting the CO2 at
Maximum Gas Flow Rate
(High Fan Speed)
Set the thermostat at the highest
possible setting or draw off the domestic
hot water at the maximum water flow
rate to create a demand for heat.
NOTE: For only Heating Boiler
Applications, open all thermostatic
valves present in the CH circuit.
Select the TEST Function by pressing and
holding the RESET button for 10 seconds.
WARNING! WHEN THE TEST FUNCTION IS
ACTIVATED THE TEMPERATURE OF THE
WATER COMING OUT OF THE BOILER MAY
BE MORE THAN 150°F.
and the icon will appear on the
display when Test Function is active.
The boiler will operate at maximum heating
power.
Press the
button
to operate the boiler at
maximum power.
The
icon will display.
ATTENTION: The CO2 at minimum gas flow
must not be set higher than the CO2
reading a maximum gas flow; it may be
set lower by as much as 1.0%, e.g., if CO2
at Max. = 9.5%, then CO2 at Min. must =
8.5-9.5%.
ATTENTION!! VALUES MUST BE
OBTAINED WITH THE FRONT COVER
INSTALLED.
If the CO2 reading differs from the values
given in the table, then adjust the gas
valve following the instructions below.
Otherwise move directly to next operation.
ADJUSTING THE GAS VALVE AT MAXIMUM
GAS FLOW
Adjust the gas valve by turning setting
screw 4 clockwise to increase the CO
2
level; counterclockwise to reduce the
CO
2
level (1 turn adjusts the CO
2
level by
approximately 0.3%). Wait 1 minute after
each change in setting for the CO
2
value
to stabilize.
If the value measured corresponds to the
value given in Table 3, max adjustment is
complete.
Otherwise continue the setting
procedure.
ATTENTION!!
Test Function will automatically
deactivate after 30 minutes.
Test Function can be turned off manually
by pressing the RESET button.
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Figure 7 - Max CO2 Adjustment
Wait 1 minute for the boiler to stabilize before
carrying out the combustion analyses.
Gas
CO
2
(%)
CO MAX
(ppm)
Natural
8.5 to 10
175
Propane 9.5 to 11 175
Table 3 - CO2 max-min
Read the CO2 value (%) and compare it with
the values given in the table below: