A.O. Smith SGS - 100 Installation & Service Manual page 46

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Conversion to a different gas category
5. Detach the 3-part gas coupling (2) adjacent to the burner.
6. Select and fit the correct orifice from the conversion kit, based on the gas
table (3.4.3 "Gas data"). The injector diameter is stamped into each injector
(6).
7. Refit the 3-part gas coupling (2).
8. Check the burner pressure and supply pressure
pressure and burner pressure").
9. Replace the cover.
10. Remove the sticker showing the new gas category from the conversion kit,
and attach it below the appliance's rating plate. This clearly indicates that the
appliance may no longer be run on the gas for which it was originally
supplied.
11. Start (9 "Starting and running")
(3.13 "Checking the supply
the appliance.
Instruction manual SGS
is