Garland GAS PIZZA OVENS Adjustments, By-Pass Flame Adjustment, Calibration

ADJUSTMENTS Continued

good mixture of air and gas. When using LP gas the flame will have a blue yellow appearance. Follow steps

thru  to adjust the flame for good quality. 1. Loosen the small knurled locking disk.

2.Turn the large adjusting disk towards the air mixture throat to reduce the opening. This restricts the amount of air, causing the flame to turn yellow.

3.Turn the adjusting disk gradually out, away from the air mixer throat, allowing more air into the air mixer until the yellow disappears and a sharp blue flame appears.

4.When the flame turns blue and spreads out, turn the locking disk tight against the adjusting disk. There may be intermittent yellow-orange flame noticed. This is caused by dust particles burning in the Flame. Should the burners fail to light, check to see if there is a problem with any or all of the following.

A.The gas supply: If there are other gas appliances on the same supply line, shut them off temporarily and see if the flame comes back on, or if it fluctuates as other gas appliances are turned on and off. If so, it would indicate overloading of the gas supply or a faulty gas pressure regulator. You should contact a qualified service agency or the local gas company to check the gas supply.

B.Dirty burner orifice or ports: With the oven cold, use a thin wire to check that the spud orifice (nozzle) is clear. If necessary, loosen and remove the spud. Be careful when cleaning not to enlarge the hole. Then, using a wire or thin nail, clear the burner ports of carbon deposits or other restrictions.

Periodically, after breaking the ovens in, check the burner flame and readjust the air mixture if needed. Black soot on the oven doors or in the burner compartment may indicate that not enough air is mixing with the gas. If this case back off the air adjustment disk until the proper flame and color is set.

By-Pass Flame Adjustment

The by-pass in the thermostat is a small gas supply through the control that is independent of the dial setting. It is controlled strictly by the Adjusting Screw. This small gas supply maintains a minimum flame or the burner(s), helping to maintain the heat in the oven and assisting in recovery. This adjustment is best done when the oven is being heated for the day’s business. To adjust the by-pass flame follow steps  thru .

1.Turn the oven on and set the thermostat to the desired temperature.

2.Allow the oven to pre-heat until the burner flame begins to throttle down.

3.At this point, turn the thermostat dial all the way down. This ensures that the thermostat is in the by- pass mode. There should now be a small steady flame remaining across the burner without flickering or going out.

NOTE: It may be necessary to turn the thermostat back up to relight the burner(s) if there is not flame present.

4.Using a small screwdriver, reach through the access hold on the control panel to the left of the thermostat knob. Turn the by-pass adjustment screw to raise or lower the by-pass flame as required. Counter- clockwise raises the flame, clockwise lowers the flame. Take care not to turn the screw out too far as that will allow gas to leak around the adjustment screw.

Calibration

1.Field calibration is seldom necessary and should not be attempted unless experience with cooking results definitely proves that the control is not maintaining the temperature to which the dial is set.

2.Place the thermocouple of the test instrument or reliable mercury thermometer in the center of the oven approximately one or two inches (25mm – 50mm) above the hearth. Do not place the thermocouple directly in contact with the hearth.

Page 10 Part # 1844063 (08/06)