Disconnect motor leads from main motor starter. Leave starter in circuit.

Put jumper on air flow switch.

Close main gas cock on main gas line to burner

Close pilot gas cock on pilot gas line to burner.

Put 50 seconds on ignition timer in motor control panel and one (1) minute on purge timer.

Air pressure of 20 PSI on inside of instrument panel.

Start system. Push blower start button.

After the one (1) minute purge, a visual inspection can be made inside blower cabinet of spark from spark ignition. If safety valve light comes on position of spark ignitor is INCORRECT and the ultraviolet eye is picking up the spark as a flame.

Once correct spark is obtained shut system off.

Open pilot gas cock in pilot gas line to burner.

Connect leads to main motor starter in control panel and take jumper off of air flow switch.

Start system.

Now for 50 seconds a visual inspection can be made of the pilot flame. Flame should be 4 inch diameter and blue in color, this can be obtained by adjusting the pilot orifice and pilot regulator located in pilot gas line to burner.

After optimum flame is obtained shut system down and reset ignition timer back to 15 seconds and set minimum of 3 minutes on purge timer.

Connect manometer to gas pressure test plug.

1. Remove 1/4" test plug with Allen wrench, plug is located adjacent to scanner opening below nameplate on burner casting.

2. Insert suitable adaptor fitting to connect manometer test hose.

3. Open shut-off valves at top of manometer and connect to hose.

Start oven main fan.

1. Close oven doors.

2. Open fresh air intake and exhaust dampers.

3. Make sure all access doors in supply ducts are closed.

4. Also on access doors on blower cabinet and cross section are closed air tight.

Check static condition of firing chamber.

1. Take pin out of actuator linkage to gas burner crank arm.

2. Hold burner crank arm at furthest low fire position.

3. Note negative condition of firing chamber on manometer.

4. Now replace pin, adjusting linkage so that burner is 1/4 open when actuator is off position. Make sure low fire microswitch on top of burner is still actuated.

1. Using chart above.
2. Find burner size on burner nameplate.
3. Subtract negative condition found in firing chamber step #20-C from W.C. stated to obtain required gas pressure at AHI at fire position.
4. This gives you inches of water column you will set the main gas pressure regulator, in the HIGH fire position for normal conditions.
5. This setting is gas pressure required for normal conditions of operation and resulting heat release as stamped on nameplate.
6. Due to variations in construction location of burner and environment final burner adjustment may be other than nameplate specification. Erratic combustion chamber pressure can decrease or increase burner capacity. Rotating dampers can cause up to 1/2" W.C. combustion chamber fluctuation pressure, also opening of food processing oven doors, opening and closing fresh air and exhaust dampers and addition of steam for humidification. All of the above variables must be taken into consideration for final burner adjustment.

1. Open Food Processing Oven doors.
2. Open shut-off cock in gas line between burner and safety valve. It is to be used only for leakage test for safety valves. This is a F.M. requirement.
   1. Set low gas pressure switch to lowest setting (0" W.C.).
   2. Set high gas pressure switch to higher setting (14" W.C.).
   3. Set air flow switch to lowest setting (.07" W.C.).
   4. Set combustion air switch lowest setting (.07" W.C.).

   Note: These switches must be adjusted properly as indicated in Adjusting Low Combustion Air Cut-Off and Check of Low Fire Flame with Oven in Operation or you will be operating under a hazardous condition.

    

3. Start oven waiting for safety valve open light to illuminate.
4. Close Food Processing Oven doors, making sure fresh air and exhaust dampers are open and all access doors closed.
5. Remove cap from top of main gas regulator.
6. Remove pin from actuator linkage again, slowly move burner. Control crank arm to HIGH fire position.
7. Adjust main regulator to required setting that you obtained from above .

1. This adjustment of a smaller flame can be obtained by adjusting the linkage from the air motor to crank arm on burner. Once smallest flame is obtained with burner in low fire position, the low fire micro-switch must be actuated by the eccentric cam, located on top of Maxon burner (see drawing).
2. If at any time stability of flame is questionable or oven shuts down low fire flame could be too small.

1. Open oven door, start gas burner, leave in low fire or burner position, shut oven doors.
2. Remove pin from burner crank arm. Put burner in HIGH fire. While watching the mercury balance tube in the high gas pressure switch, rapidly return the burner to low fire. Watch for the mercury tube to rock. Continue to set the switch lower until the tube begins to rock when the burner is returned to low fire. At this point increase the switch setting by 1" W.C.

Note: The highest gas pressure occurs at low fire.

1. Open oven doors, start gas burner, leave in low fire, shut oven doors.
2. Pull cotter pin and pin on burner crank arm.
3. While watching the mercury balance tube in the Low Gas Pressure Switch, rapidly advance the burner to Hi fire position. Watch for the mercury tube to rock. Continue to set the switch higher until the mercury tube begins to rock. At this point set the switch lower by 1" W.C.
4. Replace covers and caps on equipment.

Note: The lowest gas pressure occurs at HIGH fire.

1. Connect manometer to combustion air fan impulse line on Maxon burner by teeing into impulse 1/4" copper line between combustion fan and low combustion air cut-off switch.
2. Open oven doors, start gas burner, leave in low fire, close oven doors.
3. Remove cotter pin and pin on burner crank arm.
4. Advance crank arm of gas burner to high fire position (slowly).
5. When burner is at maximum firing rate, note and record air pressure on manometer. Follow procedure deriving at proper setting of low combustion air cut-off switch.
6. Take a temperature recording chart, cut or tear a 1 1/2" wide slot from outer edge to center of chart. Place it over inlet of combustion air fan (between motor and fan guard). Adjust chart until you are 25% less than pressure on previous procedure.
7. Remove cap on top of low combustion air cut-off switch, adjust by screwing plug adjusting screw clockwise (lower spring tension on diaphragm) slowly, until pressure switch contacts open, interrupting flame safety circuit, closing safety valves, killing flame of burner.
8. Position crank arm of gas burner back to low fire start position, remove paper from fan.
9. Replace covers and caps on equipment.

1. Open oven doors, start gas burner, leave in low fire position, close oven doors.
2. Remove cap on top of air flow switch, adjust by screwing plug adjusting screw clockwise slowly until switch contacts open, interrupting flame safety circuit, closing safety valves, killing flame of burner.
3. Turn screw plug counterclockwise two or three turns.
4. Replace covers and caps on equipment.

1. Shut oven down.
2. Remove cotter pin and pin on burner crank arm.
3. Set dry bulb at 160°F, wet bulb at 40°F (check to see that output of vapor cook air line is 15 PSIG).
4. Burner air actuator should be at its most extended position. Move burner crank arm to high fire position. Check to see of clevis and crank arm align.
5. If clevis and crank arm do not align, loosen actuator stops, and relocate at proper positions.

1. Start oven making sure oven is at room temperature.
2. Unit should be allowed to run in low fire or start position for approximately one (1) hour, oven doors closed, and oven empty.
3. Oven temperature should not climb more than 20°F above room temperature.
4. If oven does run more than 20°F above room temperature, low fire flame is too large.