NTI TRX150 Series Independent Mechanical Supply Instruction Manual

NTI TRX150 Series Independent Mechanical Supply

Specifications

• Models: TRX150, TRX199, TRX199C
• Conversion Kit No.: 560001000100, 560001000200
• LP Diaphragm Size: 5.7 mm
• Part Number: 420022002700 – Rev. 02 – 031324

FAQs

• Q: Can these instructions be used for models other than TRX150, TRX199, and TRX199C?
  • A: No, these instructions are specific to the mentioned models only. Contact NTI for instructions regarding other models.
• Q: What should I do if the kit contents do not match those specified for my boiler model?
  • A: If the kit contents do not match, do not proceed with installing the LP-conversion kit, and do not operate the boiler. Contact NTI for assistance.

WARNING

This conversion kit shall be installed by a qualified installer, service agency, or gas supplier following the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is not followed exactly, a fire, an explosion, or production of carbon monoxide may result causing property damage, personal injury, or loss of life. The qualified installer, service agency, or gas supplier is responsible for the proper installation of this kit. THE INSTALLATION IS NOT PROPER AND COMPLETE UNTIL THE OPERATION OF THE CONVERTED APPLIANCE IS CHECKED AS SPECIFIED IN THE MANUFACTURER’S INSTRUCTIONS SUPPLIED WITH THE KIT, WHICH NECESSITATES THE USE OF A CALIBRATED CO2/O2 AND CO COMBUSTION ANALYZER.  General Safety information

• NTI boilers are factory-set to operate with Natural Gas.
• BEFORE OPERATING WITH PROPANE the boiler must be converted to Propane using this kit.
• Use the procedures outlined in these instructions to fully complete the Natural Gas to LP conversion for models TRX150, TRX199, and TRX199C

Kit Contents:

• Natural to LP Conversion Instructions nr. 1
• LP Conversion Label nr. 1
• LP-Mixer w. Diaphragm (Table 1) nr. 1
• Gasket for gas pipe nr. 2

IF THE KIT CONTENTS DO NOT MATCH THOSE SPECIFIED FOR YOUR BOILER MODEL (SEE TABLE 1), DO NOT PROCEED WITH INSTALLING THE LP-CONVERSION KIT, AND DO NOT OPERATE THE BOILER – CONTACT NTI FOR ASSISTANCE.

Model| Polidoro code (MIXER data plate)| Conversion Kit No.| LP diaphragm Ø
---|---|---|---
TRX150| 350_0920_03| 560001000100|

5.7 mm

TRX199/199C| 350_0890_03| 560001000200
Table 1 – LP Mixer and Gas diaphragm|

WARNING

• These instructions CANNOT be used to convert NTI appliance models not referenced in these instructions. Contact NTI for the Natural Gas to LP conversion kit and instructions for other models.
• Failure to apply these instructions properly may result in dangerous Carbon Monoxide levels, fire or explosion leading to property damage, personal injury or death.

ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE

• Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your boiler is not installed in a pit or similar location that will permit heavier than air gas to collect.
• Local Codes may require appliances fueled with LP gas be provided with an approved means of removing unburned gases from the room. Check your local codes for this requirement.

WARNING: Breathing Hazard – Carbon Monoxide Gas

• Do not operate heater if flood damaged.
• Install vent system in accordance with local codes and manufacturers installation instructions.
• Do not obstruct heater air intake or exhaust. Support all vent piping per manufacturers installation instructions.
• Do not place chemical vapor emitting products near unit.
• According to NFPA 720, carbon monoxide detectors should be installed outside each sleeping area.
• Never operate the heater unless it is vented to the outdoors.
• Analyze the entire vent system to make sure that condensate will not become trapped in a section of vent pipe and therefore reduce the open cross sectional area of the vent.

Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

Installation and Preset Procedure

1. Install LP-Mixer with LP-Diaphragm
   • a. Check that the code of the air / gas mixer and the diameter of the gas diaphragm are those indicated for the model of boiler to be converted – see Table 1.
   • b. Turn the 120VAC power supply OFF to the boiler.
   • c. Turn the gas supply OFF.
   • d. Remove the front cover from the unit.
   • e. Remove the junction box.
   • f. Remove the silencer.
   • g. Unscrew the two nuts and remove the gas pipe.
   • g. Remove the three bolts securing the NG-mixer to the blower and remove the NG-mixer.
   • Legend:
   1. Mixer Tube (Replace with the LP-Mixer present in the Natural to LP Conversion Kit delivered with the boiler
   2. LP Diaphragm (Install LP Diaphragm present in the Natural to LP Conversion Kit delivered with the boiler)
   3. Gas Seal
   4. O-Ring
   5. Fan
   • NOTICE: VERIFY THE O-RING SEAL BETWEEN THE MIXER AND BLOWER IS CORRECTLY POSITIONED AND IN GOOD CONDITION BEFORE ASSEMBLING.
   • h. Secure the LP-Mixer (with LP Diaphragm) to the blower in the same position as the removed NG-Mixer, reusing the bolts from the previous step.
   • NOTICE: VERIFY THE O-RING SEAL BETWEEN THE MIXER AND BLOWER IS CORRECTLY POSITIONED AND IN GOOD CONDITION BEFORE ASSEMBLING.
   • i. Reassemble the gas pipe to the gas valve and mixer. ATTENTION!! USE THE NEW RUBBER GASKETS PROVIDED WITH THE KIT.
   • j. Install the silencer.
2. Perform preliminary adjustment on gas valve throttle screw 4.
   • a. 150, 199, and 199C: Adjust throttle screw 4 – counter-clockwise 1.25 turns.
   • b. Turn the gas supply on and test for gas leaks in all piping.
   • c. Perform gas line pressure test and combustion calibration following Parts 2 and 3.

Operation Sequence and Gas Line Pressure Check

WARNING: Failure to perform the Gas Valve and Burner Setup correctly may result in incorrect operation, component failure, property damage, serious injury, or death.

1. Operating Sequence
   • Prior to commencing the Gas Valve and Burner Setup, perform the following operating sequence check:
   • a. Turn the supply of gas to the boiler off.
   • b. Set the thermostat to the highest setting.
   • c. Ensure the combustion fan prepurges for a short time before activating the igniter.
   • d. Ensure the combustion fan post-purge for at least 5 seconds before reactivating the igniter.
   • e. Set the thermostat to the lowest setting and continue with the Gas Valve and Burner Setup procedure outlined below.
2. Gas Line pressure
   • The boiler gas valve is equipped with a Line Pressure Test Port; see screw 1, Figure 4. Use the following procedure to measure the gas line pressure to the boiler to ensure it falls within the range given in Table 2:
   • a. Turn the supply of gas to the boiler off.
   • b. Loosen screw 1 (Torx 10 – Line Pressure Test Port). This port is directly connected to the gas line feeding the boiler. See screw 1, Figure 4.
   • c. Connect a gas pressure gauge to the line pressure test port using applicable tubing. Ensure both ends of the tubing make a tight connection.
   • d. Turn the gas supply to the boiler on and check for gas leaks.
   • e. Observe the line pressure under static conditions and compare it to Table 2. The pressure will be greatest under static conditions.
   • f. Observe the line pressure with the boiler running, while checking/ adjusting the CO2 at maximum and minimum gas flow rate (see Part. 3). Compare it to Table 2. The pressure will be lowest during the maximum flow of gas.
   • g. Adjust the gas line pressure to ensure the parameters in Table 2 are attained under all conditions. If possible, adjust the line pressure to the “Nominal/Desired” value listed in Table 2 while the unit is operating at the maximum power. Continue observing gas line pressure until completing of necessary Checking/ Adjusting of the CO2 (see Part 3), in case adjustments need to be made.
   • h. Complete pressure testing. Remove the tubing from the test port and then return the bleed screw of the Line Pressure Test Port to the closed position. Check for gas leaks.

| Line Pressure (inches w.c.)
---|---
Nominal| Min.| Max.
Natural| 7| 3.5| 10.5
Propane| 11| 8| 13
Table 2 – Line Pressure Parameters

Combustion Check and Calibration

DANGER Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage of gas, resulting in a fire or explosion causing property damage, serious injury or death.

NOTICE The line pressure is a function of the gas supply and is affected solely by field provided parameters such as line size and regulator settings. Under no circumstances can the boiler gas valve influence or be used to adjust the gas line pressure.

WARNING: Adjustments to the Gas valve may only be made by a qualified gas technician, while using a calibrated combustion analyzer capable of measuring CO2 and CO. Adjustments may only be performed if the gas line pressure is maintained above minimum levels throughout the duration of the test. See Table 3. Failure to follow these instructions may result in serious injury or death.

WARNING FAILURE TO PERFORM THE FLUE GAS ANALYSIS AND ADJUSTMENT AS DETAILED IN THIS SECTION MAY RESULT IN ERRATIC AND UNRELIABLE BURNER OPERATION, LEADING TO REDUCED EFFICIENCY, INCREASED FUEL CONSUMPTION, REDUCED COMPONENT LIFE, HEAT EXCHANGER COMBUSTION DEPOSITS, AND GENERAL UNSAFE OPERATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS INJURY OR DEATH.

1. Preparing the measuring equipment
   • Remove the flue test port plug as illustrated, and insert a calibrated combustion analyzer.
   • NOTICE: Make sure the analyzer is set to the appropriate fuel.
   • WARNING: It is required to use a calibrated combustion analyzer to verify final adjustment according to the combustion chart (Table 3). Failure to do so could result in serious personal injury or death.
   • WARNING: It is very important that the combustion system be set within the recommended CO2/ CO measurements listed in Table 3. 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 CO2/CO measurements could result in property damage, severe personal injury, or death.
2. Checking/Adjusting the CO2 at Max Power (100%)
   • 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.
   • 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 and ramps to Max Power (100%).
   • (see Note BURNER TEST)
   • 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:
      | LP Gas
     ---|---
     Power| Max Power (100%)| Min Power (10%)
     CO 2 (%)| 10-10.7%| 9.5-10.2%
     CO PPM| <175| <175
     Gas Pressure| 8-13” WC
     Table 3 – Combustion Settings
     NOTICE: the CO2 at Min Power must be set lower than the CO2 at Max Power by 0.5-1.0%.
     Example: If CO2 at Max Power = 10.2%, then the CO2 at Min Power must = 9.5-9.7%
   • WARNING! When the Burner Test Function is activated the temperature of the water coming out of the boiler may exceed 179°F.
   • Note: BURNER TEST
   • To activate the BURNER TEST access to the Test Mode Menu.
   • Press the MENU button.
   • Turn the dial to select Test Mode and press ENTER.
   • Press ENTER again to select Burner Test.
   • Turn the dial to select MAX Power and press ENTER.
   • The boiler turns on and ramps to Max Power (100%).
   • Set combustion according to Table 3.
   • Turn the dial to select MIN Power and press ENTER.
   • The boiler modulates to Min Power (10%).
   • Set combustion according to Table 3.

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 the next operation.

ADJUSTING THE GAS VALVE AT MAX POWER (100%)

• 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 Table 3, the max adjustment is complete.
• Otherwise, continue the setting procedure.

Checking/Adjusting the CO2 at Min Power (10%)

From the Burner Test screen, turn the dial to select MIN POWER and press ENTER to operate the boiler at minimum power.

• Wait 1 minute for the boiler to stabilize before carrying out the combustion analyses.
• If the CO2 (%) reading at Min Power is outside the range indicated in Table 3, adjust the gas valve following the instructions in Figure 8. Otherwise proceed directly to step 4.
• NOTE: Min Power calibration must be performed after Max Power calibration.
• NOTE: The CO2 reading at Min Power must be set lower than the CO2 reading at Max Power by 0.5-1.0%

ADJUSTING THE GAS VALVE AT MIN POWER (10%)

• Remove cap and adjust screw 2 by turning counter – clockwise to reduce the CO2 level; clockwise to increase the CO2 “level (Note: total adjustment should not exceed 1/4 of a turn from factory setting).
• Wait 1 minute after each adjustment for the CO2 value to stabilize.
• WARNING! MIN POWER ADJUSTMENT IS VERY SENSITIVE. (total adjustment should not exceed 1/4 of a turn from factory setting).
• If the value measured corresponds to the value given in Table 3 adjustment is complete. Otherwise continue the setting procedure.
• ATTENTION!! IF THE VALUE OF THE CO2 AT MIN POWER HAS BEEN CHANGED, IT IS NECESSARY TO REPEAT THE ADJUSTING AT MAX POWER.

1.       Canada: Altitudes between 2000-4500 ft, de-rate by 10%. Consult local authorities for de-rating for altitudes above 4500ft.

2.         USA: De-rate capacity by 4% for every 1000 ft above sea level, if altitude is above 2000 ft.

Table 4 – Gas Input at Min and Max Power

Ending Adjustment

1. Exit Test Mode by pressing RESET.
2. Turn down the thermostat and/or stop the DHW draw-off. For Only Heating Boiler applications reset all thermostatic valves.
3. Reinstall the combustion test port. See Figure 6.
4. Check for and repair any leaks of gas.
5. Reinstall the front cover.

WARNING

Carbon Monoxide – Never leave the unit operating while producing Carbon Monoxide (CO) concentrations above the values indicated in Table 3. Failure to follow this warning may result in serious injury or death.

WARNING Breathing Hazard – Carbon Monoxide Gas

• Do not operate heater if flood damaged.
• Install vent system in accordance with local codes and manufacturers installation instructions.
• Do not obstruct heater air intake or exhaust. Support all vent piping per manufacturers installation instructions.
• Do not place chemical vapor emitting products near unit.
• According to NFPA 720, carbon monoxide detectors should be installed outside each sleeping area.
• Never operate the heater unless it is vented to the outdoors.
• Analyze the entire vent system to make sure that condensate will not become trapped in a section of vent pipe and therefore reduce the open cross sectional area of the vent.
• Breathing carbon monoxide can cause brain damage or death. Always read and understand instruction manual.

Document the Conversion

1. Update rating plate
   • As the certified installer of the Natural Gas to LP Conversion Kit, you must indicate on the boiler that it has been converted for use with Propane (LP) Gas:
   • a. Update Rating Plate Decal – Locate the rating plate decal on the side of the appliance. Using a regular ink pen, check the box next to “Field converted to Propane Gas” and fill in the date. Press hard enough to permanently mark the decal. See Figure 9.
   • b. Conversion Decal – Fill out the required information on the Conversion Decal (included in this kit) and affix it to the boiler cabinet adjacent to the rating plate decal, in a location where it can be easily seen. See Figure 10.

CONTACT INFORMATION

• NTI Boilers Inc.
• 30 Stonegate Drive Saint John,
• NB E2H OA4 Canada
• Technical Assistance: 1-800-688-2575
• Website: www.ntiboilers.com
• Fax: 1-506-432-1135
• Visit us online

Documents / Resources

| NTI TRX150 Series Independent Mechanical Supply [pdf] Instruction Manual
TRX150, TRX199, TRX199C, TRX150 Series Independent Mechanical Supply, TRX150 Series, Independent Mechanical Supply, Mechanical Supply, Supply
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