Southbend X560DD S536A - Manual (Page 27)

500 S ERIES R ESTAURANT R ANGES S ERVICE
O WNER ’ S M ANUAL 1188716 (09/07) P AGE 27 OF 48
A DJUSTMENT OF O PEN -T OP P ILOTS
The open-top pilots are the non-aerated (yellow-tipped flame) type. One is located beside each open-top burner.
Pilot outage is often caused by an unstable flame due to over-adjustment to the point where the flame is leaving its port,
or “blowing off.” Often, in an effort to improve ignition, the pilots are increased too much and result in this unstable
condition.
The pilots are adjusted by inserting the blade of a screwdriver into the slot on the small valve, located on the manifold.
The maximum flame size is approximately 3/4" (19 mm) with a slight yellow tip. The first indication of over-adjustment is
evident when the yellow tip begins to stream into black streaks and generate carbon. Continued over-adjustment leads
to the unstable lifting and blowing condition.
A
DJUSTMENT OF
O
PEN
-T
OP
B
URNERS
All open-top burners are primarily adjusted by means of an air shutter on the mixer face.
To adjust a burner, loosen the screw that holds the air shutter in position and rotate the mixer cap until a clear, stable
blue flame is obtained. The flame should not be yellow tipped nor should it blow off the burner ports.
All orifice sizes and burner rate are properly set at the factory and should not be altered.
Over-rated burners cause poor burner and pilot performance, resulting in less heat, and wasted gas.
A
DJUSTMENT OF
O
VEN
S
TANDING
P
ILOT
The standing oven pilot flame can be adjusted by turning the adjusting screw on the pilot line valve with a screwdriver.
The pilot line valve is located behind the kick panel below the oven door. Remove the kick panel to gain access. The
pilot flame is properly adjusted when it is just large enough to maintain a glowing red color of the flame switch capillary
bulb.
A
DJUSTMENT OF
O
VEN
B
URNER
The oven burner orifice is of the fixed type, sized for the specified gas supply. The burner flame characteristics are
controlled by varying the primary air mixer cap. There should be a clear blue flame with a distinct inner cone at each
port. Excessive primary air can result in “blowing” or the flames leaving the ports. Lack of primary air causes soft or
yellow tipped flame.
A DJUSTMENT OF O VEN B YPASS F LAME L EVEL
When the oven reaches the temperature at which the dial is set, the oven thermostat reduces the flow of gas to the
amount required to keep the oven at that temperature. However, the thermostat must always supply enough gas to keep
the entire burner lighted. To maintain this minimum flame, the bypass must be set carefully and accurately using the
following procedure (see illustration on page 29):
1. Open the kick panel below the door of the oven by lifting it slightly and pulling the top edge away from the oven.
The oven burner should now be visible.
2. Turn the oven thermostat to its highest setting and check that the oven burner ignites.
3. After 5 minutes, turn the oven thermostat down to point between the two lines on the thermostat dial between
OFF and the lowest temperature setting (this is the bypass setting).
4. Check to see if the flame is about 3/4" (19 mm) high along the entire length of the burner. If it is, the bypass
flame level does not need adjustment. If it is not, continue with this procedure.
5. Remove the control knobs, thermostat dial and bezel, and the valve panel.
6. Using a screwdriver, turn the bypass adjustor on the stem of the thermostat (see illustration on page 29)
counterclockwise to increase the flame or clockwise to decrease the flame until the flame is approximately 1/4" (6
mm) high along the entire length of the burner. (If no flame is present at all, place a flame at the burner shutter to
check for gas flow.) If the proper flame level cannot be established, replace the thermostat.
7. Replace the valve panel, control knobs, and thermostat bezel and dial. Turn all control knobs to the OFF
position.