LP-719 Rev. 000 Rel. 000 Date 6.25.20
70
WARNING
!
It is very important that the combustion system be set within the
recommended CO measurements listed in Table 28. Visually looking
at the burner does not determine combustion quality. Failure to
measure combustion with a calibrated combustion analyzer and
set the throttle within the recommended CO measurements could
result in property damage, severe personal injury, or death.
Operation 3
-
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 the
maximum power. The
icon
will display.
Wait 1 minute for the boiler to
stabilize before carrying out
the combustion analyses. Read
the CO2 value (%) and compare it with the values given in the table
below:
0
Natural Gas
LP Gas
Fan Speed
Low
High
Low
High
CO PPM
<175
<175
CO
2
(%)
8.5 - 9.7
9.5 - 10.7
ATTENTION: The CO
2
at minimum gas flow (Low Fan Speed)
must not be set higher than the CO
2
reading at maximum gas
flow (High Fan Speed). It may be set lower by as much as 0.5
to 1.0%.
For Example: If CO
2
at Max. = 9.2%, CO
2
at Min. = 8.2-8.7%
Table 28 - Combustion Settings
ATTENTION!! Obtain all values with the front cover installed.
If the CO2 (%) reading differs from the values given in the table,
adjust the gas valve following the instructions below. Otherwise
move directly to Operation 4.
Adjusting the Gas Valve at
Maximum Gas Flow
Adjust the gas valve by turning setting
screw
4
clockwise to increase the CO2
level; counterclockwise to reduce
the CO2 level (1 turn adjusts the CO2
level by approximately 0.3%). Wait 1
minute after each change in setting
for the CO2 value to stabilize.
1
3
2
4
4
4
Figure 70 - Max CO2
Adjustment
If the value measured corresponds to the value given in the Table
28, max adjustment is complete. Otherwise continue the setting
procedure.
ATTENTION!!
The Test Function will automatically deactivate after
30 minutes, or Test Function can be turned off manually by pressing
the RESET button.
Operation 4
-
Checking the CO2
at Minimum Gas Flow (Low Fan
Speed)
With the Test Function active, press
the
button to operate the
boiler at minimum DHW power.
The
and
icons will display.
Wait 1 minute for the boiler to
stabilize before carrying out the
combustion analyses.
If the CO2 (%) reading at min gas flow
is greater than the CO2 (%) reading
at max flow, or if it is less than the
reading at max flow by more than
0.3%, adjust the gas valve following
the instructions below. Otherwise
move directly to Operation 5.
Adjusting the Gas Valve at Minimum
Gas Flow
Remove cap and adjust screw
2
by turning counter-clockwise to
reduce the CO2 level; clockwise to increase the CO2 level. Wait 1
minute after each adjustment for the CO2 value to stabilize.
WARNING! Minimum Gas Flow Adjustment is very sensitive.
If the value measured corresponds to the value given in Table 28
adjustment is complete. Otherwise continue the setting procedure.
Attention!! If the value of the CO2 at minimum power has been
changed, it is necessary to repeat adjusting at maximum gas
flow.
Operation 5 - Ending Adjustment
1. Exit Test Mode by pressing RESET.
2. Turn down the thermostat and / or stop the DHW draw-off.
For Heating Boiler Only applications reset all thermostatic
valves.
3. Check for and repair any leaks of gas.
4. Reinstall the front cover.
5. Reinstall the combustion test port -
see Figure 69.
1
3
2
4
2
2
Figure 71 - Min CO2
Adjustment