78
Part 11 - Start-Up
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 23
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 72 - Gas Valve
Figure 73 - Combustion Test Port
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:
Natural Gas
LP Gas
Fan Speed
Low
High
Low
High
CO PPM
<175
<175
CO
2
(%)
8.5 - 9.7
9.5 - 10.7
The CO2 at minimum gas flow rate (Low Fan Speed) must be set
lower than the CO2 reading at maximum gas flow rate (High Fan
Speed) by 0.5 to 1.0%.
For Example: If CO2 at High = 9.2%, then CO2 at Low must = 8.7%
- 8.2%
Table 32 - 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.
If the value measured corresponds to the
value given in the Table 33, 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.
1
3
2
4
4
4
Figure 74 - Max CO2
Adjustment
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.
It is required to use a calibrated combustion analyzer to verify
final adjustment according to the combustion chart (Table 33).
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 33. 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.
WARNING
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Содержание TRX150
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