Middleby Marshall PS555G GAS installation manual IV. Quick Reference Troubleshooting

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SECTION3-OPERATION

IV. QUICK REFERENCE: TROUBLESHOOTING

ENGLISH

 

 

 

 

 

 

SYMPTOM

 

 

 

 

 

 

 

PROBLEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The oven temperature ex-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ceeded 650°F (343°C), and

light is lit, food product is

 

the burner or heating ele-

 

ments were automatically

 

 

 

 

 

 

undercooked

 

 

 

 

 

 

 

 

shut down.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oven will not

 

Electrical power may not be

 

 

 

 

 

 

 

turn on at all

 

reaching the oven, or the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

controls may be set incor-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rectly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oven shuts down shortly

 

The gas burner did not light

 

 

 

after it is turned on

 

within 90 seconds of turn-

 

 

 

 

(gas ovens only)

 

ing the "HEAT" (

 

) Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to the “ON” ("I") position.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This automatically en-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

gages a safety

lockout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mode.

 

 

 

 

 

 

 

 

 

SOLUTION

Follow the procedures under Daily Shutdown Procedures in this section to shut down the oven. Contact your Middleby Marshall Authorized Service Agent to determine and correct the cause of the condition to prevent damage to the oven.

Check that the circuit breaker/fused disconnect is turned on.

Check that the "BLOWER" () Switch is in the “ON” ("I") position. The burner cannot engage until the blowers are in operation.

Turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

Wait for AT LEAST FIVE MINUTES before restarting the oven.

Repeat the Daily Startup procedure.

The oven did not reach 200°F (93°C) within 15 min- utes of startup, and the oven has stopped heating.

appears in display, oven is not heating

Oven will not heat

Controls may be set incor-

 

rectly.

 

Oven is operating, but

Air fingers may have been

little or no air is blowing

reassembled incorrectly

 

 

 

 

from air fingers

after cleaning.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conveyor moves with a

Conveyor may be jammed

jerky motion, or will not

on an object in the oven, or

 

 

 

 

 

 

move at all

conveyor belt or drive chain

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tension may be incorrect.

Turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

Wait for AT LEAST FIVE MINUTES before restarting the oven. Repeat the Daily Startup procedure.

Check that the Set Point is correctly set.

Check that both the "BLOWER" () and "HEAT" () Switches are in the “ON” ("I") position.

If the oven still will not heat,turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

Wait for AT LEAST FIVE MINUTES before restarting the oven.

Repeat the Daily Startup procedure. Check that the Set Point is above 200°F (93°C).

Turn the oven off, and allow it to cool. Disconnect electrical power to the oven.

Refer to Section 4, Maintenance, for instructions on reassem- bling the air fingers.

Turn the oven off, and allow it to cool. Disconnect electrical power to the oven.

Check if the conveyor is blocked by an object inside the oven.

Refer to Section 4, Maintenance, for instructions on checking the conveyor and drive chain tension.

Food products are

Controls may be set incor-

• Check that the set temperature and bake time settings are

overcooked or

rectly.

correct.

undercooked.

 

 

IF THESE STEPS FAIL TO RESOLVE THE PROBLEM, CONTACT YOUR LOCAL MIDDLEBY MARSHALL AUTHORIZED SERVICE AGENT. A SERVICE AGENCY DIRECTORY IS SUPPLIED WITH YOUR OVEN.

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Contents PS500 Series Gas and Electric Ovens Rev. B V2 11/01English Table of Contents Oven Uses DescriptionII. Oven Components see Figure Installation Electrical specifications for PS555G and PS570G gas ovensBase PAD KIT see Figure QuantityInstallation KIT see Figure III. Ventilation SystemRequirements RecommendationsIV. Assembly 2c. Legs/Casters Installation Quad OvensRestraint Cable Installation Conveyor InstallationInstall the conveyor drive motor cover 10 Checking the conveyor tensionFinal Assembly VI. Electrical SupplyAdditional Information Gas Ovens Additional Information Electric OvensRate regulator Must be installed in the line Before Above steps or when necessary during service mainVII. GAS Supply System by closing its individual manual shutoff valve dur15 Flexible Gas Hose Installation Gas ConversionOperation Location and Description of ControlsII. Normal Operation STEP-BY-STEP III. Quick Reference Digital Temperature Controller IV. Quick Reference Troubleshooting Maintenance Maintenance DailyII. Maintenance Monthly When removing the conveyor, refer to -9 in , InstallationIII. Maintenance Every 3 Months Split Belt Disassembly and CleaningRemove the idler shaft assembly from the conveyor Loosen the locking collar set screw, as shown in FigureBlower Belts IV. Maintenance Every 6 MonthsLubricating the Blower Fan Bearings KEY Spare Parts KIT Available separately. See Figure Gas OvensElectric Ovens Item Qty DescriptionWiring Diagrams ThermocouplesElectricalwiringdiagrams Important diagram for the oven is also An electrical wiringLocated inside the machinery compartment 380V or 480V, 50/60Hz, 3 Ph