Maintenance Manual

Start-Up

GMND-SVX01B-EN 29

Pilot Adjustment

1. Remove the pilot adjustment cap.

2. Adjust the pilot screw to provide a properly sized

flame.

3. A proper pilot flame is a soft steady flame that

velops 3/8- to 1/2-inch (9.5 to 12.7 mm) of the flame

sens

or.

4. Replace the pilot adjustment cap.

Manifold Pressure Adjustment

If the manifold pressure requires adjustment, remove the

cap from the pressure regulator and turn the adjustment

screw clockwise to increase the pressure, or

counterclockwise to decrease the pressure. The adjusted

manifold pressure should not vary more than 10 percent

from the pressures specified in Table 7, p. 28.

Figure 19. Main burner flames

LIFTING

(TOO MUCH AIR)

NORMAL

(HARD FLAME)

YELLOW TIPPING

(MARGINAL)

YELLOW FLAME

(TOO LITTLE AIR)