9
COMMISSIONING
27
Natural gas regulator adjustment
Check supply pressure
1 Turn on smallest burner to minimum.
2 Adjust screw fully in and read pressure.
3 If reading is below 1.13 kPa then supply pressure is insufficient.
…if supply pressure is between 1.13 and 1.20 kPa then proceed as follows:
1 Turn the adjusting screw outward until the pressure just begins to drop. Carefully adjust
to a pressure of 1.10 kPa.
Note: that the screw may unwind fully before the pressure drops. If so then simply
remove the screw and let the pressure fall, then reinsert the screw and complete
the adjustment.
2 Turn the control for the small burner slightly away from minimum until the pressure
drops and then slowly turn back to minimum.
3 Repeat 1 and 2 until the pressure always returns to 1.10 kPa.
4 Turn all burners on to maximum and read pressure. If it is below 0.82 kPa then repeat
steps 1 to 4.
5 Lock the nut.
…if supply pressure is above 1.20 kPa then proceed as follows (refer below):
1 Turn all burners on to maximum.
2 Adjust the screw so that the test point pressure reads 0.85 kPa and tighten the
nut slightly.
3 Turn smallest burner to minimum and all others off. Gently tap the regulator until test
point pressure is stable and read pressure.
4 Turn all burners on to maximum and read pressure. Evaluate the difference between
this reading and that found in step 3.
5 Adjust the screw so that the difference between 1.0 kPa and the reading is
approximately half the difference between the two readings found in steps 3 and 4.
6 Repeat steps 3 to 5 until no further adjustment is required. The 1.0 kPa mark should
now lie approximately halfway between the reading with all burners on at maximum
and the reading with the small burner on at minimum. Lock the nut.
C O M M I S S I O N I N G
–
1.2 kPa —
–
1.1 kPa —
–
1.0 kPa —
–
0.9 kPa —
–
0.8 kPa —
–
–
1.2 kPa —
–
1.1 kPa —
–
1.0 kPa —
–
0.9 kPa —
–
0.8 kPa —
–
Test Point Pressure with all
burners operating at maximum.
Test Point Pressure with small
burner operating at minimum.
1.0 kPa lies
halfway between
these two readings
