Orifice Size Requirements For Different Elevations - Vulcan-Hart MG12 Service Manual

The gas/air balance is controlled by an air shutter on the front of the top burner. A yellow streaming
flame on the burner is an indication of insufficient air. To correct this condition, loosen the screw
locking the shutter into position. Rotate the air shutter open until the burner flame begins to lift from
the burner, then close the shutter slightly down again and lock it into place (Fig's. 2 & 3).
ORIFICE SIZE REQUIREMENTS FOR DIFFERENT ELEVATIONS OF
MODULAR AND STEP-UP RANGES
INPUT AT SEA LEVEL
ORIFICE SIZE
SEA LEVEL
TO 2,000 FT.
2,000 FT.
TO 4,000FT.
4,000 FT.
TO 6,000 FT.
6,000 FT.
TO 8,000 FT.
Fig. 2
OPEN TOP
20,000
NAT/LP
44/55
45/55
46/56
47/57
SAUTE' HOT TOP
STEP-UP
26,000 20,000
NAT/LP NAT/LP
41/53 44/55
42/54 45/55
43/54 46/56
44/55 47/57
– 7 –
Fig. 3
GRIDDLE
15,000
NAT/LP
48/55
49/58
50/60
51/63