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SFT 199 - Fuel Conversion to Natural Gas
(LP to NG) - P-803
Note
If converting from natural gas to propane, order the propane conversion parts kit (IBC Part # P-802)
from your authorized IBC distributor.
Use the natural gas conversion parts kit if the fuel source at the site uses natural gas and the modulating
tankless water heater has been set up t o operate with propane. Check the rating plate on the tankless water
heater to see which fuel source the particular appliance has been set up with.
Using this conversion kit, a qualified technician will need to:
1. Perform a fuel conversion.
2. Perform a combustion test.
3. Fill in the information required on the fuel conversion labels, and affix them to the appliance after the
conversion is completed.
Warning
Disconnect power supply before any wiring/service is performed. Failure to do so could
result in damage to appliance and/or electric shock.This conversion kit shall be installed by
a qualified service agency in accordance with 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 service agency 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.
The appliance will automatically de-rate the maximum input at a rate of approximately 2% per 1,000' above
4,500'. The gas valve's zero-governor will ensure that the gas-air mixture is not affected at altitude.
Included with the conversion kit:
Part #
180-173
150-175
080-224
080-107
080-245
120-241E1
Fuel Conversion Kit, LP to NG - Superflow SFT 199
Description
NG orifice # 660
Orifice O -ring 19 x 2
Rating plate overlay
Gas valve conversion label
Installer Identification label
Quantity
1
1
1
1
1
| 1
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Summary of Contents for IBC SFT 199
- Page 1 The appliance will automatically de-rate the maximum input at a rate of approximately 2% per 1,000’ above 4,500’. The gas valve's zero-governor will ensure that the gas-air mixture is not affected at altitude. Included with the conversion kit: Fuel Conversion Kit, LP to NG - Superflow SFT 199 Part # Description Quantity NG orifice # 660 180-173 150-175 ...
- Page 2 Combustion Test Target Ranges Figure 1 Gas valve and fan The Low Fire (zero-offset) valve adjustment cap on the gas valve has been factory set. Do not adjust this screw in the field unless indicated i n these instructions. After converting the appliance to natural gas, a combustion (CO ) reading must be taken by a qualified technician using properly functioning and calibrated combustion analyzing equipment and the results compared to the values in Table 1. Natural Gas High Fire with front cover open Low Fire with front cover open Max. CO value 10.1% Actual Value at High Fire Min. CO value 9.1% 9.1% Table 1 - CO values at High and Low Fire...
- Page 3 Alternative Natural Gas Orifice - calorific values between 750-900 BTU/FT To perform a fuel conversion: 1. Turn off the gas supply at the gas shut-off valve. 2. Disconnect the electrical power. 3. Disconnect the gas valve harness plug from the gas valve. 4. Disconnect the nut at the gas valve outlet (top of the gas valve), and remove the O-ring and orifice. 5. Insert the correct orifice into the O-ring, and re-install into the nut at the gas valve outlet (top of the gas valve), and then tighten the nut. 6. Restore the gas supply by opening the gas control valve. 7. Test for leaks by using an approved leak detection solution on all joints. 8. Power on the water heater appliance. Now, carefully follow the procedures on Combustion Testing and Adjustment. SFT 199 - Fuel Conversion to Natural Gas (LP to NG) - P-803...
- Page 4 Combustion Testing and Adjustment Danger A combustion test checks that the gas valve is operating properly in the field. To perform a combustion test, you must be a qualified, trained and licensed gas fitter. Making adjustments to the IBC gas valve without a properly calibrated gas combustion analyzer and by people who are not trained and experienced in its use is forbidden. Failure to use an analyzer can result in an immediate hazard. Model Number High Fire Input 199 MBH SFT 28-199 Table 4 - Rated input of a converted appliance Normal ignition system sequence of operation: The appliance's control, upon a call for DHW, turns on the combustion fan for a short pre-purge, then energizes the spark electrode and gas valve for a 5-second trial for ignition. If the burner does not light, the process is repeated until the burner lights and flame is detected. After 4 unsuccessful trials for ignition, the appliance locks out and will need to be manually reset by pressing the Return Arrow button. To perform a combustion test and adjustment: 1. ...
- Page 5 c. When finished, replace the Low Fire cap, and leave the manual mode by pressing + AND - simultaneously. 7. Switch off the appliance by pressing the space above the d ot. 8. Turn off the gas at the appliance's gas shut-off valve. 9. Remove the flue gas analyzer from the test port, and reinstall the test port cap. 10. Remove the gas pressure manometer from the gas valve, and fully close the test port. 11. Turn on the gas at the appliance’s gas shut-off valve. 12. Ensure there are no gas leaks before reinstalling the front cover. 13. Turn on the appliance by pressing the space above the dot. Completing and Affixing the Conversion Labels 1. Fill in the conversion labels (included in the kit) associated with the new fuel type. 2. Place the conversion labels onto the appliance at the positions indicated on the last page. SFT 199 - Fuel Conversion to Natural Gas (LP to NG) - P-803...
- Page 6 Clocking the Meter (for Natural Gas only) 1. Turn off all other appliances and pilots. 2. Turn on the appliance and set the appliance to high fire. 3. Ensure the appliance has a large load to heat, so that the appliance will not shut off. 4. With a Stop-Watch, record the number of seconds for the smallest dial to make 1 full revolution. 5. CFH = (3600 x Dial Size) / Seconds 6. CFH x 1000 (check local Btu content) = Input Btu’s. Note For 2 PSI meters multiply CFH x 1.097 For Metric meters multiply CFH x 35.3 For 2 PSI metric meters multiply CFH x 1.097 x 35.3 For Altitude above 4,500’ deduct 2% per 1,000’ of altitude from the Input Btu’s.
- Page 7 Where to Place Conversion Labels on the Tankless Water Heater SFT 199 - Fuel Conversion to Natural Gas (LP to NG) - P-803...
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