Marshall Air 2424G Operators Manual

This document contains the installation and operating instructions for:

MODEL:2424G AUTOBROIL™ (AC2B, AC2J)

FOR YOUR SAFETY

DO NOT STORE OR USE GASOLINE OR OTHER

FLAMMABLE VAPORS OR LIQUIDS IN THE VICINITY

OF THIS OR ANY OTHER APPLIANCE.

INSTRUCTIONS TO PURCHASER:

1. ANSI Z83.11 STANDARDS REQUIRE THAT YOU POST IN A PROMINENT LOCATION THE PROCEDURES TO FOLLOW IN THE EVENT THE USER SMELLS GAS. THIS INFORMATION SHALL BE OBTAINED FROM THE LOCAL GAS SUPPLIER.

2. THIS MANUAL NEEDS TO BE RETAINED FOR FUTURE REFERENCE.

WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, OR MAINTENANCE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. READ THE INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR SERVICING THIS EQUIPMENT.

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MODEL 2424G

TABLE OF CONTENTS

PAGE

I. MACHINE SETTINGS (Quick Reference)........................................................................................ …. ………...2

II. MACHINE INSTALLATION....................................................................................................................………….3

Pre-lnstallation ...................................................................................................................................……………3

Appliance Location. .............................................................................................................................…………...3-4

Electrical Information ........................................................................................................................……………..4

Gas Piping To Appliance....................................................................................................................…………....4

Pre-Operation Check.........................................................................................................................…………....5

Lighting and Shut -Off Instructions.....................................................................................................…………....5

Performance Criteria ........................................................................................................................…………....6

III. OPERATING INSTRUCTIONS .........................................................................................................…………....7

Broiler and Toaster Adjustment -Daily................................................................................................…………....7

Setting Temperature Controller For Proper High/Low Operation-Weekly ........................................………… ...8

IV. SCHEDULED MAINTENANCE......................................................................................................…………….....8

Daily Cleaning Procedures. ............................................................................................................…………….....8-9

Monthly Cleaning Procedures.............................................................................................................…………....10

Quarterly Cleaning Procedures and Preventive Maintenance...........................................................……………. 10-11

V. TROUBLE SHOOTING .......................................................................................................................……..…... 11-14

VI. ASSEMBLY & DISASSEMBLY INSTRUCTIONS............................................................................…………….. 14-15

VII. REPLACEMENT PARTS..................................................................................................................…………….. 15-21

BROILER LIMITED WARRANTY.......................................................................................................……………....i

BROILER WARRANTY PROCEDURES..........................................................................................………………..ii

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ILLUSTRATIONS

Overall Dimension.............................................................................................................................. Figure 1

Exploded View - Removable Parts.................................................................................................... Figure 2

Exploded View- Internal Parts .......................................................................................................... Figure 3

Exploded View - Drive System .......................................................................................................... Figure 4

Gas Distribution System .................................................................................................................... Figure 5

Pilot System....................................................................................................................................... Figure 6

Conveyor - Axle Scraper.................................................................................................................... Figure 7

Restraining Device. ............................................................................................................................ Figure 8

Control Panel..................................................................................................................................... Figure 9

Burner Construction........................................................................................................................... Figure 10

Hot Surface Pilot Operation............................................................................................................... Figure 11

Hot Surface Pilot Trouble Shooting ................................................................................................... Figure 12

Autocat™ Catalytic Converter............................................................................................................ Figure 13

Autocat™ Catalytic Converter for LP Gas ......................................................................................... Figure 14

Lower Burner Support Assembly....................................................................................................... Figure 15

Conveyor Drive Shaft Assembly #132659......................................................................................... Figure 16

Kit, 9.5" Arm Extension Assembly..................................................................................................... Figure 17

Platen Assembly Left #124655.......................................................................................................... Figure 18

Platen Assembly Right #124656........................................................................................................ Figure 19

Conveyor Drive Shaft Assembly #124584......................................................................................... Figure 20

Toaster Loading Arm Assembly........................................................................................................ Figure 21

Wiring Schematic....................................... (208V, 1PH, 60Hz, 19 amps) Drawing #121664 (AC2B, AC2J)

Wiring Schematic....................................... (220V -240V, 1PH, 50Hz, 22 amps) Drawing #122597 (AC2BINTL)

Wiring Schematic....................................... (220V -240V, 1PH, 50Hz, 22 amps) Drawing #133551 (AC2B)

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I. MACHINE SETTINGS

AUTOBROIL™

MODEL: 2424G

SERIAL NUMBER: __________________________________________________________________________

TYPE OF GAS: _____________________________________________________________________________ ELECTRICAL SUPPLY : _______________________________________________________________________ BROILER HIGH/LOW TEMPERATURE SETTING: _________________________________________________

GAS PRESSURE: HIGH ________________ LOW _____________ BROILER SPEED SELECT OR SETTING: __________________

TOASTER TEMPERATURE SETTING: _______________________________________________________

START-UP TECHNICIAN: ____________________________________________________________________

START-UP DATE: __________________________________________________________________________

COMMENTS: ______________________________________________________________________________ _________________________________________________________________________________ __________________________________________________________________________________ ___________________________________________________________________________________

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II. MACHINE INSTALLATION

PRE-INSTALLATION

1. After uncrating the Autobroil™ unit, inspect for shipping damage. Check that all control knobs are intact on the electrical cabinet front. Contact the factory if there are obvious problems. Set the unit in place and leave the plastic wrapping on to protect it from the debris and trash of building construction. DO NOT remove plug from gas inlet pipe. Leave this for the Qualified Service Company. Check that machine has not been dented or damaged by the carrier. Notify your freight carrier immediately to file a concealed damage claim, following the instructions attached to the outside of the shipping crate. Your warranty will not cover freight damage.

2. Installation must be performed by a Qualified Service Company. The term "Qualified Service Company" means any individual, firm, corporation or company which is either engaged in and is responsible for the installation or replacement of gas piping on the outlet side of the meter, or the service regulator when a meter is not provided, or the connection, installation or repair of gas appliances, who is experienced in such work, familiar with all precautions required, and has complied with all the requirements of the authority having jurisdiction.

3. A remote gas shut -off valve must be provided and interlocked to the exhaust fire protection system.

A gas shut -off control is located on the top of the gas safety valve (behind the right side panel) for emergency shut-off of gas supply to this appliance.

4. Because this unit is power fan exhausted, it is necessary to provide adequate make up air equal to the amount removed. In addition to this, any other exhausts, flues, or air removal systems must be taken into consideration. Examples of this are heat removal fans or hot water heater flues.

5. The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system attest pressures in excess of 1/2 psig (3.45 kPa).

6. The appliance must be isolated from the gas supply piping system by closing its individual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.45 kPa).

APPLIANCE LOCATION WARNING: IF NOT INSTALLED, OPERATED AND MAINTAINED IN ACCORDANCE WITH THE MANUFACTURER'S

INSTRUCTIONS, THIS PRODUCT COULD EXPOSE YOU TO SUBSTANCES IN FUEL OR FROM FUEL COMBUSTION WHICH CAN CAUSE DEATH OR SERIOUS ILLNESS AND WHICH ARE KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.

1. Position Autobroil™ to properly align with exhaust hood (refer to equipment plan).

2. The hood/ventilator for the appliance should be located in accordance with the National Fire Protection Association Standard #96, "Removal of Smoke and Grease-Laden Vapors from Commercial Cooking Equipment" and any local applicable requirements.

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3. For proper installation, the minimum clearance from combustible construction is 0" from sides and 18" from food loading end and food delivery end.

4. Adequate clearance should be maintained to allow easy access to loading and unloading areas of the machine.

5. For servicing, unit must be moved two feet clear from all construction.

CAUTION: KEEP THE APPLIANCE AREA FREE AND CLEAR FROM COMBUSTIBLES.

ELECTRICAL INFORMATION

1. The domestic appliance is furnished with a cord only — no plug; and requires a 208 volt, A.C., 60 HZ, Single Phase, 4 wire (including ground), 30 AMP circuit. Appliance must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical code ANSI/NFPA No. 70-latest edition.

2. The international appliance requires 220 volt or 240 volt, A.C., 50 Hz, Single Phase and is furnished with a cord only— no plug.

3. There is a Wiring Diagram located in the Owner's Manual and under the right side skin.

GAS PIPING TO APPLIANCE

1. Installation of this appliance must conform with local codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z-223.1 -latest edition.

2. In Canada, this appliance is to be installed in accordance with Standard CGA B149.1 or B149.2 Installation Codes for gas burning appliances and equipment and any local applicable requirements.

3. The appliance is supplied with a 3/4" female pipe thread. The installer must make the pipe connection to the unit in accordance with the "National Fuel Gas Code," ANSI Z-223.1-latest edition. The gas line connected to the 3/4" female pipe thread cannot be less than a 3/4" pipe. The gas pressure and gas volume required by this appliance is shown on Page 7. Gas piping from source to broiler must be adequate to satisfy these requirements when all other gas appliances in the restaurant are operating at maximum demand.

4. A flexible AGA approved gas line is available. Instructions are (1) the installation shall be made with a connector that complies with the Standard for Connectors for Movable Gas Appliances, ANSI Z21.699-latest edition, and Addenda, Z21.69a-latest edition, and a quick-disconnect device that complies with the Standard for Quick-Disconnect Devices for Use With Gas Fuel, ANSI Z21.41-latest edition, and Addenda, Z21.41alatest edition and Z21.41b-latest edition, and (2) adequate means must be provided to limit the movement of the appliance without depending on the connector and the quick-disconnect device or its associated piping to limit the appliance movement. See Figure 8 for details.

5. See Page 3, Items 5 and 6, for instructions on gas supply line pressure testing.

CAUTION: DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATION AIR.

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PRE-OPERAT10N CHECK

Before lighting and operating your Autobroil™, make a quick check of critical items as follows:

1. Remove both side panels and check to see that all parts are in place and that none are damaged. Particularly make sure all burners are in place and that the shields are in position on the bottom burners.

2. Start conveyor chains and check for proper operation. The conveyor chains should run free and not be catching on anything.

3. The speed of the conveyor chains should be modulated from low to high, and back again without the chain stopping.

4. Before first use, and after any special cleaning, it is necessary to "season" the broiler chain. This is done by bringing the broiler to operating temperature and then (with burners still lit) applying liquid shortening from a saturated cloth over the full width of the broiler chain while the chain makes 5 or 6 complete revolutions.

5. Check that gas pressure at appliance is correct (see Performance Criteria on Page 7).

6. Check that broiler grease tray is in place under burners (Figure 2).

LIGHTING INSTRUCTIONS FOR ELECTRONIC IGNITION SYSTEM

1. Turn exhaust system on. (Some hoods are so powerful that the broiler must be lit before the exhaust is turned on).

2. Make sure filters are in place in the hood.

3. Turn conveyor chain on and set speed at approximate mid-point.

4. Remove right side cover. (Same Side As Controls)

5. Turn gas control switch on top of Honeywell gas safety valve to "ON".

6. Turn on the broiler heat switch on the control panel and verify all burners have ignited. Ignition is electronic (does not require manual lighting of pilot). Set broiler temperature controller on right side of the broiler (behind the side panel) to 400°F (204°C) (see Item 3 of setting temperature controller on Page 9).

7. If pilot flame or burners fail to light turn heat switch off and wait five minutes before attempting to relight.

SHUT-OFF INSTRUCTIONS

1. Turn heat switch off.

2. Wait 30 minutes.

3. Turn conveyor switch off.

4. Turn exhaust system off.

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PERFORMANCE CRITERIA

1. The manifold pressure for each burner and appliance inlet pressure and gas amount is listed below:

TYPE OF GAS - Natural or Propane

PRESSURE AT THE APPLIANCE - 6.0-10.0 IWC for Natural

- 11.0-14.0 IWC for Propane

MANIFOLD PRESSURE - Low 4.0 IWC; High 5.0 IWC

for Natural

- Low 8.0 IWC; High 10.0 IWC for Propane

- Low 9.0 IWC; High 10.0 IWC for Propane ( LP Catalyst Only)

TOTAL GAS AMOUNT ** - 97,000 BTUH @ 100% High Fire Manifold pressure is measured by a pressure gauge on the outlet side of the Honeywell gas valve. With the unit on for

at least twenty minutes and the broiler temperature controller set at 400°F (204EC) (see Item 3 on Page 9), the pressure should be at 4.0 IWC (8.0 IWC for propane), (9.0 IWC for LP Catalyst). With the broiler temperature controller set for 800°F (427°C) the high fire pressure is 5.0 IWC (10.0 IWC for propane). High pressure is adjusted using the regulator in the top of the Honeywell gas safety valve. Low fire is adjusted using the gas pressure regulator. See Figure 5 for gas system layout.

2. The burners in the appliance are a special infrared type. All of the air for combustion must be injected through the Venturis. This makes orifice design and alignment very critical. The orifice design, in combination with the correct natural or propane gas pressure will result in adequate air aspiration and mixing. There are no air shutters. No air adjustment is needed. The proper orifice part numbers are found in Section VII - Replacement Parts.

CAUTION: DO NOT STACK BOXES OR IN ANY WAY BLOCK AREA IN IMMEDIATE VICINITY OF VENTURIS

OR IN ANY OTHER WAY OBSTRUCT FLOW OF COMBUSTION AIR.

2. Ignitor - sensor - pilot burner flame is adjustable with a small screwdriver. The cap screw behind the 1/4" gas line

exiting the valve should be removed. See Figure 5. The small adjusting screw is under the cap screw. Turning the small adjusting screw inward (clockwise) will reduce the flame to the pilot. The pilot flame should be uniform and just large enough to make a flame envelope around the end of the sensor and ignitor.

3. All burners will be bright orange when burning properly. If a dull red is observed after 30 minutes of warm-up with a blue

flame above the burner face, the orifice may be dirty or damaged. "Popping," or burning back at the orifice of the burner, is a result of the burner screen being loose or a faulty gasket under the burner screen. LP machines may exhibit a light "popping" sound when the unit is turned off; this is normal.

NOTE: IF BURNER SCREEN IS TORN OR HAS A HOLE, OR IF A GASKET IS LEAKING, THE BURNER

MUST BE REPAIRED. See Figure 10.

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Ill. OPERATING INSTRUCTIONS

BROILER AND TOASTER ADJUSTMENT - DAILY

LIGHTING INSTRUCTIONS FOR ELECTRONIC IGNITION SYSTEM

1. Turn exhaust system on. (Some hoods are so powerful that the broiler must be lit before the exhaust is turned on.)

2. Make sure filters are in place in the hood.

3. Turn conveyor chain on and set speed at approximate mid-point.

4. Remove left side cover.

5. Turn gas control switch on top of Honeywell gas safety valve to "ON".

6. Turn on the broiler heat switch on the control panel and verify all of the burners have ignited. Ignition is electronic. Set broiler temperature controller on right side of control cabinet to 400EF (204EC) (see Item 3 of setting temperature controller on Page 9).

7. If pilot flame or burners fail to light turn heat switch off and wait five minutes before attempting to relight.

SHUT-OFF INSTRUCTIONS

1. Turn heat switch off.

2. Wait 30 minutes.

3. Turn conveyor switch off.

4. Turn exhaust system off.

TOASTER OPERATING INSTRUCTIONS

1. Turn the toaster temperature thermostat on the front of the control cabinet to between 425°F (218°C) and 450°F (232°C).

2. Adjust the bun platens in height over the conveyor so the platen touches the bun as it is transported under the platen. This produces a caramelized surface. If the platen is adjusted too low, the bun will be crushed.

TOASTER SHUT-OFF INSTRUCTIONS

1. Turn toaster thermostat to "OFF" position. (This can be done as soon as toaster buns are no longer needed.)

PROLONGED POWER FAILURE: NO ATTEMPT SHOULD BE MADE TO OPERATE THE APPLIANCE DURING

POWER FAILURE.

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SETTING TEMPERATURE CONTROLLER FOR PROPER HIGH/LOW OPERATION - WEEKLY (This Control Is Located Under The Right Broiler Side Cover)

1. Follow the procedure in Step 3 below in order to set temperature control for 400EF (204EC). After doing this, turn on the burners.

2. Allow the broiler burners and conveyor chain to warm up for 60 minutes (with the chain at approximately the correct speed).

3. Observe the temperature displayed: push "SET" and release to view the "SET POINT." To change set point push "SET" and, within three (3) seconds, use the arrows to select a new set point. When setting the High/Low for proper operation, make the set point THE SAME as the observed temperature made after the sixty (60) minute warming. Broiler High/Low control is now set. The setting should be approximately 700°F (371 °C). If not at least 650°F (343°C), the high and low gas pressures, as discussed on Page 7 under Performance Criteria, may require adjustment or the hood exhaust may be excessive. The broiler will work but will cook slower.

4. The temperature displayed by the control at all times is the ACTUAL temperature, except for a few seconds after depressing SET.

5. Place one meat patty on the broiler chain. Bas ed on the appearance of the broiled patty, reset the Digital Speed Control for the desired broiling quality. (Note: this single patty should be cooked to the maximum degree of the Minimum/Maximum doneness tolerance.)

NOTE: THE NUMBERS DISPLAYED BY THE SPEED CONTROL ARE RELATIVE TO ONE

ANOTHER. THE LARGER THE NUMBER, THE FASTER THE CONVEYOR.

IV. SCHEDULED MAINTENANCE

DAILY CLEANING PROCEDURES CAUTION: Do not touch the broiler section immediately after appliance shut -down. The temperature inside enclosures is in

excess of 500°F (260°C), which eliminates the need to clean any parts inside the enclosures for sanitary purposes. Any grease that may build up on the exterior of the enclosures should be cleaned off with a damp cloth and a minimum amount of detergent. Never use a large amount of water on the enclosure or allow

burner faces to get wet as this could cause premature burner or gasket failure. Disconnect the power supply to the appliance before cleaning or servicing.

CAUTION: Under no circumstances should oven cleaner be used on this appliance. IT WILL EAT HOLES IN

THE ALUMINUM GAS VALVES AND GAS LINES, CAUSTIC FUMES CAUSE ELECTRICAL COMPONENT DAMAGE, AND WILL CAUSE MANY OTHER PROBLEMS IF USED TO CLEAN THIS BROILER.

CAUTION: KEEP THE APPLIANCE AREA FREE AND CLEAR FROM COMBUSTIBLES.

1. Allow broiler burners and chain to operate for 30 minutes after cooking last patty to burn off excess grease on broiler components. Then turn the unit off and allow to cool. (This applies every time a meat chain is turned of f — regardless of what time of day meat chain is shut down - and regardless of how few patties were broiled in the last 30 minutes, last hour, etc.) This will clean some parts of the cooking chamber. Failure to perform this procedure daily will result in poor cooking times.

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2. Remove all exterior panels except those which are attached with screws. Be careful not to touch any hot internal broiler components.

3. Remove burners from left side of unit and shake all debris off burners after they cool. Both top and bottom burners may be slid out through the side of the machine. DO NOT WASH BURNER AS IT WILL DESTROY GASKET. Brush surface of burner mesh with soft brush.

4. Remove lower burners and shields. Brush or scrape residue off shield.

WARNING: THE BURNER AND REVERBERATING SCREENS (LOCATED UNDER THE TOP BURNERS),

ARE MADE FROM INCONEL METAL MESH. THIS MATERIAL DETERIORATES WITH USE. INSPECT THESE SCREENS DAILY AND REPLACE IF SCREEN IS SEVERELY CORRODED. FAILURE TO DO SO CAN RESULT IN METAL PARTICLES BEING SERVED TO YOUR

CUSTOMERS.

5. Remove the following items and wash with hot soapy water.

* Toaster Exit Ramp Figure 2 * Broiler Grease Tray Figure 2 * Toaster Arm Cover Figure 2 * Crumb Tray (Toaster Section) Figure 2

* Grease Drain Channel Figure 3 * Catch Pan & Insert Figure 2 * Grease Pan Figure 2

* NOTE: these items may be removed during the 30 minute period.

Tunnel Guard Front & Rear Figure 2

Tunnel Closure Figure 2 Tunnel Fillers (2 each) Figure 2 Drip Tray (Broiler Arm) Figure 2 Lower Discharge Tent Figure 3

Meat Stripper Figure 3

6. With the conveyor switch ON and heat switch OFF, wire brush the broiler conveyor and, as it cools, wipe

with damp cloth.

7. Scrape deposits from the axles with the axle scraping tool, furnished with each machine as shown in Figure

*THIS IS IMPORTANT TO PREVENT GREASE FIRES AT REAR OF THE BROILER.

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8. To Clean Toaster: Run a damp cloth down the conveyor (folded to the thickness of a bun) at least three times

a day and just before shutting down the unit for the night. Don't scrub the Teflon sheet with any coarse materials.

9. Remove grease and meat residue from any part of remaining broiler structure where visible. Use a damp cloth with detergent and a putty knife for best results.

10. After cleaning all removable parts as noted, allow to dry and reassemble.

MONTHLY CLEANING PROCEDURES

1. Turn off gas knob on top of the safety valve and disconnect electricity.

2. Remove upper burners, reverberating screens, lower burners, and shields to check for wear. These parts are illustrated in Figure 3.

3. If the conveyor chain has been removed, make certain it is not on backward and CLOSE open links to match other links. (Figure 7)

4. Using a damp cloth, wipe the inside of each burner venturi.

5. Reinstall burner screens, lower burner shields, and burners.

6. On LP Broilers with catalyst, install the (2) burner flame deflectors. (Figure 14)

7. Remove spark guard and wipe out. (Figure 2)

8. PROCEDURE FOR CLEANING OPTIONAL MARSHALL CHARBROILER CATALYSTS:

Marshall recommends that the restaurant soak the catalyst in a solution of commercial degreaser and warm water for twenty minutes once a month. It is important to note that the catalyst may flake off the metal honeycomb substrate if it is impacted by a high-pressure water stream. Therefore, we recommend that the restaurant personnel first prepare the degreaser-and-water bath, and then place the catalyst in the bath. We want to emphasize that the cleaning procedure involves a soak, rather than a scrubbing or hosing procedure. After soaking for twenty minutes, rinse the catalyst either by soaking again in cold water or by rinsing in a gentle stream of cold water. Following the rinse, shake the catalyst to remove all excess water, and allow to dry at room temperature before returning it to service. A large fan may be used to move room air more quickly over the catalyst to expedite the drying step. When installing catalyst on LP Broilers, be sure broiler top extension is in place.

QUARTERLY CLEANING PROCEDURES & PREVENTIVE MAINTENANCE

1. If required, remove conveyor and soak in hot soapy water overnight. The chain is removed by lifting axle up to produce slack and separating as described in Figure 7. When replacing chain, make certain the conveyor is installed properly. PLACING CHAIN ON BACKWARD WILL CAUSE SEVERE BINDING PROBLEMS. CLOSE open links to match other links. (Figure 7)

2. If required, spread conveyor links open with screwdriver or chain pliers (part #500033). Lift front axle up to make slack in the conveyor belt, unhook conveyor chain and remove to gain access to lower cooking chamber for cleaning side walls. Make reference to the orientation of the conveyor links and the conveyor direction for reassembly. (Figure 7)

3. Lubricate the roller (drive) chain with a few drops of any grade motor or machine oil.

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4. Remove and inspect all motor brushes and replace if less than 1/4" is left.

5. Do not remove internal gas lines for cleaning.

6. Clean gas orifices:

• Orifices are passageways directing gas flow into burner. Uneven gas flow or air to gas ratio is caused by dirty or damaged orifices.

• Orifices are made of brass. Use special care in cleaning-don't gouge or make gas holes bigger.

• To reach orifices, remove burners.

• Use a pipe cleaner dipped in rubbing alcohol to clean orifices. Swab until clean;

free of carbon build-up. Do not use drill bit; this will damage the orifices.

7. Blow out all six (6) burners through the venturi opening with a low pressure air source.

CAUTION: Do not drop burners or get wet as this may break gasket or add to premature burner failure.

8. INVENTORY THE SPARE PARTS KIT AND ORDER MISSING PARTS AS NEEDED. KEEP A COMPLETE SET OF PARTS ON HAND AT ALL TIMES.

V. TROUBLESHOOTING

This section contains a list of possible problems with the Autobroil™ unit. ALL ELECTRICAL TROUBLE SHOOTING INVOLVING ACCESS INTO THE MOTORS OR ELECTRICAL ENCLOSURES MUST BE PERFORMED BY A QUALIFIED ELECTRICIAN. All items marked with asterisks (*) should be performed by service agency qualified to perform service on gas fired appliances.

1. PROBLEM: BURNER BACKFIRES. Flashback, blue flame at entrance to burner makes motor-boating sound like a

blowtorch. IMPORTANT: If burner backfires, turn it off. Continued operation will cause damage to the entire burner.

POSSIBLE CAUSE:

* A) Burner screen failure (hole) or burner gasket. SOLUTION: Replace burner screen or gasket.

* B) Burner over-fired - manifold pressure too high. SOLUTION: Check and reset gas control

regulator to give rating plate value for manifold pressure (shown under Performance Criteria on Page 7). Wait 5 minutes & relight. Flashback will not occur immediately unless a large opening in or around the burner screen is evident. Wait an hour after relighting to check that problem is solved. Figure 5 illustrates which regulator sets high and low gas pressures.

* C) Check to ensure all screws holding the burner screen in place are snug. See Figure 10.

2. PROBLEM: FLAMES VISIBLE AT EXHAUST STACK OR IN CHAMBER. POSSIBLE CAUSE:

* A) Low gas pressure. SOLUTION: Check and reset gas control regulator to give rating value for manifold

pressure (shown under Performance Criteria on Page 7). Figure 5 illustrates which regulator sets high and low pressures.

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3. PROBLEM: PILOT FLAME GOES OUT (STUDY FIGURE 11 & 12 FOR PILOT OPERATION).

POSSIBLE CAUSE:

* A) Pilot assembly dirty or bent. SOLUTION: Check for bent pilot gas line and/or dislodge debris * B) Low gas pressure. SOLUTION: Increase gas pressure to appliance (see Figure 5). * C) Pilot orifice clogged. SOLUTION: Dislodge debris or replace orifice.

* D) Wires from pilot assembly loose. SOLUTION: Trace wires to where they plug into gas valve and check

connection. (Figure 6)

* INSTRUCTIONS MARKED WITH ASTERISKS SHOULD BE PERFORMED BY AUTHORIZED SERVICE PERSONNEL.

4. PROBLEM: BURNER WILL NOT LIGHT AT ALL.

POSSIBLE CAUSE:

A) Hot Surface Ignition. SOLUTION: Recycle heat switch. See Figure 11 and 12. B) Orifice. SOLUTION: Check that orifice is not plugged. (If it is necessary to change the orifices, new ones must

be ordered from the factory).

C) Check that flame runner is fully lit (Figure 6). SOLUTION: If not, clean flame runner orifice or remove and

clean flame runner.

D) Pilot. SOLUTION: Pilot must light and stay lit in order for burner to light. Check pilot problem list (see Item 3

on Page 13).

* E) Gas Solenoid. SOLUTION: Check that solenoid valve on main gas valve is working.

F) Pilot Solenoid. SOLUTION: Check that solenoid valve #501698 on Figure 5 is functioning. It

opens for 120 seconds during the ignition cycle and then closes with a delay -on-break timer in the control cabinet.

G) Pilot Jumpers. SOLUTION: Check the short and long pilots shown at the top of Figure 6 to make certain they

are not plugged. They turn off after 120 seconds from activating heat switch.

5. PROBLEM: CONVEYOR CHAIN WILL NOT MOVE.

POSSIBLE CAUSE:

* A) Check for object caught in conveyor, causing a jam. SOLUTION: Remove object. * B) Check 1.5 amp fuse on top of the control cabinet (Figure 6) SOLUTION: Replace if blown and recycle

ON/OFF switch.

* C) Check 10 amp fuse. SOLUTION: Replace if blown. * D) Check to see if motor shaft is moving. SOLUTION: Sprocket needs to be tightened. * E) Check switch to make sure power is flowing through it. SOLUTION: Replace switch.

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* F) Connect motor control leads to an operating motor speed control board. SOLUTION: If motor runs, replace

motor control board. If motor still does not run, replace motor.

6. PROBLEM: CONVEYOR RUNS BUT SPEED IS CONSTANT POSSIBLE CAUSE:

* A) There are four parts to the motor system. They are the motor, the circuit board, the digital speed control and

the fuse mounted on the top of the control cabinet. The most likely problem would be a blown fuse.

SOLUTION: Using spare parts, replace one part at a time until the trouble spot is identified.

* INSTRUCTIONS MARKED WITH ASTERISKS SHOULD BE PERFORMED BY AUTHORIZED SERVICE

PERSONNEL.

7. PROBLEM: REPEATED MECHANICAL BINDING.

POSSIBLE CAUSE:

A) Check to see that chain is not on backward. SOLUTION: See proper chain installation on Figure 7.

B) Inspect chain closely for bent or warped links that may be snagging and causing a binding

condition. Also check that the chain links are not climbing out of the sprockets as the conveyor rotates. SOLUTION: Straighten or replace bad links.

C) Make sure the axle assembly is clean and free of grease and food residue to allow smooth movement of

the conveyor. SOLUTION: Clean axle. See Figure 7.

D) Check the axle assembly to make certain all set collars, bearings, etc. are properly positioned and secure.

E) Disassemble conveyor axle assembly and check condition of bushings and bearings for excessive wear.

SOLUTION: Replace if worn or damaged.

F) Visually inspect the motor drive chain assembly for smooth rotation of chain. SOLUTION: Make certain there

are no binding or worn components.

G) Make sure conveyor is not catching on meat stripper. SOLUTION: Straighten bent stripper.

8. PROBLEM: HIGH/LOW CONTROL DOES NOT WORK. POSSIBLE CAUSE:

* A) Determine gas pressure by checking gas pressure gauge. SOLUTION: Adjust per instructions on Page 7.

B) If unit stays in high or low, check that control is properly set for about 700°F (371 °C). SOLUTION:

Res et to proper temperature as shown in Item 3 on Page 9.

B) If control flashes "EEE" or "999", then inspect thermocouple for continuity. SOLUTION: Check to be sure

thermocouple leads are securely fastened to temperature controller. If so, then replace thermocouple.

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+ 35 hidden pages

Marshall Air 2424G Operators Manual

Specifications and Main Features

Frequently Asked Questions

User Manual