Combustion Checking Procedure - NTI TRX II Series Installation Start-Up Maintenance

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.
Enable Burner Test - access the Main Menu
by pressing the Menu button.
Turn the dial to select Test Mode and press
ENTER. Press ENTER to activate Burner Test.
Turn the dial to select MAX Power and press
ENTER.
The boiler turns on at maximum power.
The gas line pressure must remain within
the range provided in Table 43 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.
Figure 89 - Combustion Test Port
WARNING
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 43). Failure to
do so could result in serious personal injury or death.
90
Setup wizard
Boiler Details
4
2
User Menu
2
Tech menu
1
Test mode
Set the thermostat at the highest possible setting or draw off the
domestic hot water at the maximum water flow rate to create a
1
demand for heat.
Burner Test
Output Test
Enable Burner Test, access the Main Menu by pressing the Menu
Air purge Function
Figure 88 - Gas Valve
button.
Turn the dial to select Test
Mode and press ENTER. Press
ENTER to activate Burner Test.
Turn the dial to select MAX
Power and press ENTER.
The boiler turns on and ramps
to Max Power (100%).
(see Note BURNER TEST)
Burner Test
Output Test
Air purge Function
OFF Wait 1 minute for the boiler to stabilize before carrying out the
Output Test
combustion analyses. Read the CO2 value (%) and compare it with the
values given in the table below:
ON
ATTENTION!!
OBTAIN ALL VALUES WITH THE FRONT COVER INSTALLED.
Burner Test
Output Test
Air purge Function
Table 43 - Combustion Settings
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.
WARNING
It is very important that the combustion system be set within the
recommended CO measurements listed in Table 43. 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
Technical Area
measurements could result in property damage, severe
4
personal injury, or death.
OPERATION 3
CHECKING THE CO2 AT MAX POWER (100%)
Test Mode
Test Mode
WARNING
WARNING! When the Burner Test Function is activated the
temperature of the water coming out of the boiler may exceed
179°F.
Manual Mode Activation
Test Mode Natural Gas
Max
Power Power
(100%)
CO (%)
9.0-9.7 %
2
CO (ppm)
<175
Gas Pressure
3.5-10.5" WC
NOTICE: the CO2 at Min Power must be set lower than the CO2 at Max
Power by 0.5-1.0%
Example (Natural Gas): If the CO2 at Max Power = 9.4%, then the
CO2 at Min Power must = 8.5-8.9%.
Example (LP): If the CO2 at Max Power = 10.4%, then the CO2 at
Min Power must = 9.5-9.9%
09/28/2023 10:36 Single Boiler
Status
Outlet:
Run
95 °F
Demand
F.Signal 125
Min Power Test in Progress
Min Power Max Power
09/28/2023 10:36 Single Boiler
Status
Outlet:
Run
158 °F 100 %
Demand
F.Signal 255
Max Power Test in Progress
Min Power Max Power
Output Test
Manual Mode Activation
Pump Test
Fan Test
3 way valve Test
DHW Pump Test
Output Test
Manual Mode Activation
Pump Test
Fan Test
3 way valve Test
DHW Pump Test
LP Gas
09/28/2023 10:36 Single Boiler
Status
Min Max
Outlet: Power:
Inhibited
Power 158 °F Power Power 0 %
Demand
(10%) (100%) (10%)
F.Signal 255
Air Purge Active
8.5-9.2% 10.0-10.7% 9.5-10.2%
<175 <175
8-13" WC
420012001300 - Rev. 04 - 031524
66°F
Power:
10 %
66°F
Power:
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
66°F
Min
<175