420010970304 - LP-700 Rev. 000 Rel. 002 Date 4.21.21
77
WARNING
!
It is required to use a calibrated combustion analyzer to verify final
adjustment according to the combustion chart (Table 29). Failure
to do so could result in serious personal injury or death.
It is very important that the combustion system be set within the
recommended CO measurements listed in Table 29. 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.
Make sure the calibrated combustion analyzer is set to the
appropriate gas type. Failure to do so could result in serious
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.
0
Natural Gas
LP Gas
Fan Speed
Low
High
Low
High
CO PPM
<175
<175
CO
2
(%)
8.5 - 9.7
9.5 - 10.5
ATTENTION: The CO
2
at minimum gas flow must not be set
higher than the CO
2
reading at maximum gas flow. It may be
set lower by as much as 0.3%
For Example: If CO
2
at Max. = 9.2%, CO
2
at Min. = 8.9-9.2%
Table 29 - 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 90 - Max CO2
Adjustment
B. Combustion Checking Procedure
The order of operations for this procedure must always be respected.
Operation 1
-
Gas inlet pressure check
Loosen screw 1 (Torx 10 - Line Pressure Test
Port) and connect a manometer to the port
using applicable tubing.
Ensure the boiler is powered on. Then enable
Test Mode by pressing the RESET button for
10 seconds. The display will show
and the icon
.
The gas line pressure must remain within the
range provided in
Table 29
for the gas type
during all operating conditions. Upon completion of the combustion
analysis and adjustment (Operations 2 through 5), remove the
pressure gauge and tighten screw 1. Verify and repair any gas leaks.
Operation 2 - Combustion Analysis
Remove the combustion test port plug as illustrated, and insert a
calibrated combustion analyzer.
1
3
2
4
1
2
4
4
2
1
Figure 88 - Gas Valve
Figure 89 - Combustion Test Port
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:
