Marshall Air F12 Service Manual

This document contains the installation and

operating instructions for:

MODELS: F12 AUTOBROIL OMNI™

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:

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.

MODEL: F12 AUTOBROIL OMNI™

TABLE OF CONTENTS

I. MACHINE SETTING .........................................................................................................…2

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

III. OPERATING INSTRUCTIONS .........................................................................................…4

IV. SCHEDULED MAINTENANCE.......................................................................................... 5

V. TROUBLE SHOOTING ....................................................................................................….6

VI. REPLACEMENT PARTS.................................................................................................…. 8

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

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

ILLUSTRATIONS

Conveyor Arrangement................................................................................................................. Figure 1

Control Cabinet, Exterior View...................................................................................................... Figure 2

Bearing, Sprockets and Motor...................................................................................................... Figure 3

Control Cabinet and Internal Layout............................................................................................. Figure 4

Conveyor Belt (Mesh Style).......................................................................................................... Figure 5

Heater Detail................................................................................................................................. Figure 6

Conveyor Adjustment.................................................................................................................... Figure 7

Circuit Board Asby with Mount...................................................................................................... Figure 8

Temperature Controller Replacement Kit..................................................................................... Figure 9

Wiring Schematic Single Belt (208V)............................................................................................ #111140

Wiring Schematic Single Belt (208V)with temperature control connection ..................................#135879

Wiring Schematic (240V).............................................................................................................. #132695

Wiring Schematic (240V) (CE)..................................................................................................… #135394

Wiring Schematic Dual Belt (240V) (CE). ...............................................................................…...#135697

I. MACHINE SETTING

SERIAL NUMBER: ___________________________________________________________________________

VOLTAGE:_________________________________________________________________________________

TEMPERATURE SETTING TOP TEMPERATURE:________________________________________________________________________

BOTTOM TEMPERATURE:____________________________________________________________________

CONVEYOR SPEED SETTING

___________________________________________________________________________________________

___________________________________________________________________________________________ START-UP TECHNICIAN:______________________________________________________________________

START-UP DATE:____________________________________________________________________________

COMMENTS:________________________________________________________________________________

___________________________________________________________________________________________

____________________________________________________________________________________________

II. MACHINE INSTALLATION

PRE-INSTALLATI0N

1. After uncrating the Autobroil Omni™ 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 Autobroil Omni™ in place and use the plastic bag to protect it from the debris and trash of building construction. Check that sideskins have 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. 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.

APPLIANCE LOCATION

1. Position Autobroil Omni™ to properly align with exhaust hood. Note nameplate clearance.

2. The hood/ventilation 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.

3. For proper installation, the minimum clearance from combustible construction is 6" from sides and 6" from back.

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

5. For servicing, unit must be moved 2" clear from all construction.

ELECTRICAL INFORMATION

1. THE FOLLOWING MUST BE PERFORMED BY A QUALIFIED ELECTRICIAN. Set the unit on

a strong flat equipment stand. Adjust each mounting foot (Figure 1) by turning foot in or out until the dimension measured at each corner of the machine is IDENTICAL. Place stops or take other precautions so machine will not accidentally slide off equipment stand.

2. 208 Volt Units: The Autobroil Omni™ unit has a power cord. The cord may be found on the backside of the unit. The actual electrical amperage requirement of the circuit may be found on the rating plate on the rear of the unit. Make certain the circuit feeding the machine is sized to handle the amperage shown on the rating plate, plus a service factor. Use the National Electric Code as a guide in sizing, wiring and circuit breakers. The power supply is 1 phase, 4 wire, and the conductors consist of two hot legs (L, and L;), neutral (N) and one ground leg. The neutral and one hot leg are used to make the control voltage, which should be 120V. The electrician should check that either both hot legs measure 120V to ground or that, as a minimum, the control circuit (starting at the 5 amp fuse) measures 120V.

3. 240 Volt Units: The power supply is 1 phase, 3 wire, and the conductors consist of two hot legs (L1 and L2) and one ground wire.

4. There is a wiring diagram located in this Owner's Manual.

III. OPERATING INSTRUCTIONS

PRE-OPERATI0N CHECK

1. After the power has been turned on, cycle the Conveyor ON switch and observe that the conveyor is moving. Leave the Heat Switch OFF. The Autobroil Omni™ is designed for limited access to the temperature and speed controls by use of a keylock. The key, which operates the lock, should be put in a safe place, and should only be used by persons authorized to go inside the Autobroil ™ oven and modify machine settings.

2. Figure 2 shows the front panel of the Autobroil Omni™, as well as the inside panel, which is

visible when the key operated front panel is open. Conveyor speed may be changed by entering. a

new setting in the digital speed selector shown in Figure 2. Speeds available range from 30 seconds to 8 minutes, adjustable in one second intervals.

3. With the locked panel closed, two temperature displays showing the temperature of the top and bottom heaters are visible. When the Conveyor ON switch is turned to ON, these displays will illustrate the approximate room temperature. This assumes the Heat ON switch has not yet been turned ON. If the Heat ON switch is ON, the displays will indicate the temperatures of the respective heaters as labeled. Again, using the key, access can be made to the inside panel and the heat selector buttons. See Figure 2. Your Operations Department has established top and bottom heat settings and generally these should not be touched unless authorized by Operations. The combination of cooking time and temperatures has been made to produce your food correctly. When setting temperatures on a new machine, depress the heat selector button and rotate the button until the displayed temperature is in accordance with operation's required setting. The set point may be reviewed at any time by depressing the selector button. When not depressed, the displayed temperature is the actual heater temperature. Perform this temperature setting operation for the top and bottom heater and then lock the front panel.

4. On the back side of the unit there are two labeled circuit breakers. See Figures 4 and 8. These circuit breakers control the top and bottom heater power. They are not intended for frequent use, but are in place to guard against an electrical short developing in the heaters. If one of these circuit breakers trips, you may reset the breaker, but if it continues to trip, it potentially indicates an electrical short and that breaker should be left off until the machine is inspected by a qualified electrician.

SHUT-OFF INSTRUCTIONS

1. When shutting down at night, turn the Heat switches OFF, but leave the conveyor running until the

temperature displayed drops below 500° F (260° C). Allowing the conveyor to run during this cool down cycle produces improved conveyor and bearing life.

IV. SCHEDULED MAINTENANCE

DAILY CLEANING PROCEDURES

1. The flat plate top and bottom heaters are self-cleaning, and at most may gather a coating of

ashes due to spillage of food on their surfaces. Removal of these ashes is best accomplished with a suction device, but if this is not available then the conveyor belt should be opened up periodically and the heaters brushed clean. Figure 5 illustrates the conveyor chain and the procedure of opening the conveyor chain.

2. By removing the support trays from each end of the machine, an inspection can be made along

the length of the machine to check for food build-up at each end. This should be scraped and removed daily to prevent excessive ongoing build-up.

3. Other daily cleaning consists of good housekeeping practices, such as wiping external surfaces.

DO NOT GET WATER ON THE ELECTRICAL CABINET OR ON THE HEATERS. NEVER HOSE THE MACHINE.

PREVENTIVE MAINTENANCE

1. In addition to daily cleaning, there is little preventive maintenance necessary on the Autobroil Omni™. Bearings are high temperature, long-life and need no lubrication. They are shown in Figure 3. After several years of continuous use, it may be necessary to replace the bearings. They should be replaced with bearings obtained from the Factory only, since they are a special high temperature type bearing.

2. The drive motor shown in Figures 1 and 3 is a DC type motor that employs motor brushes. These brushes should be checked for wear on a yearly basis (see Figure 3). Replace the brushes when they have worn in length to 1/4" or less.

3. Inspect the roller chain in Figure 1 for extensive slack. Remove the slack by loosening the screws holding the motor in place and sliding the motor down so as to tighten the chain. If no adjustment remains, then shorten the roller chain.

4. Inspect the conveyor chain at each end of the conveyor for excessive slack, see Figure 7. If there is excessive slack to the point where the upper run of conveyor may catch the lower run, check that there is still spring pressure available in the automatic tensioning system. If not, remove a conveyor link as described in Figure 5.

V. TROUBLESHOOTING

This section contains a list of imagined problems with your Autobroil Omni™ oven. By locating the problem in this section, you may be able to make a quick repair. ALL ELECTRICAL TROUBLE

SHOOTING INVOLVING ACCESS INTO THE MOTORS. HEATERS OR ELECTRICAL ENCLOSURES MUST BE PERFORMED BY A QUALIFIED ELECTRICIAN.

1. Temperature displays do not come on when depressing Conveyor ON Switch.

POSSIBLE CAUSE:

A) The 5 amp fuse inside the control cabinet is blown. Figures 4 and Schematic.

B) Wire is broken off of Conveyor ON Switch. To check, open control panel and inspect Part

#500957 on Figures 4 and Schematic.

2. One of the temperature displays does not indicate correct operating temperature. POSSIBLE CAUSE:

A) Check appropriate circuit breaker on rear of machine. Figures 4 and Schematic. B) One of the heater strips in the malfunctioning heater is burned out. To determine this

problem, remove the back skin of the machine and with an amp clamp, measure the amperage going to the suspect heater. Call Factory to check actual amp draw against draw recorded at the Factory for the serial number machine involved.

C) Terminal on backside of heater, as shown in Figure 6, has experienced burn off of lead

wire, or loosening of locking nuts. Replace wire to the heater with special high temperature wire and ring terminals as provided by Factory only.

3. The conveyor does not move. POSSIBLE CAUSE:

A) Remove motor cover as shown in Figure 1 and check that rubber cord from motor passes

into control cabinet and is not cut or broken.

B) Remove cover over chain that drives conveyor, as shown in Figure 1. Check that set

screws on the sprocket mounted on the motor shaft and the sprocket mounted on the conveyor axle are tight.

C) Locate circuit board according to information on Figure 4. With control cabinet lid open,

remove the screws and lay inside panel down. This provides access inside the control cabinet. The motor circuit board has an AGC.1 amp fuse, as shown in Figure 4. Inspect the fuse and replace with a fuse of identical rating if the original fuse is burned out.

D) Check motor brushes as covered in Figure 3.

4. Temperature of top and bottom heater does not come up to proper setting.

POSSIBLE CAUSE:

A) Check circuit breakers on backside of machine. B) Check wiring to Heat ON Switch by opening control panel and looking at Heat Switch

#500957. See Figures 4 and Schematic.

5. Temperature display shows letters "OFL".

A) Replace thermocouple of top or bottom heater depending on which display is flashing.

Make certain that new thermocouple is routed exactly like original.

With any electrical appliance there are possibilities of failure. The wiring diagram gives a detailed

description of the electrical circuits in the control cabinet. Reference to this wiring diagram should be made, and assistance sought from a local service agency and/or the Factory in pursuing other problems.

VI. REPLACEMENT PARTS

Whenever ordering parts, make certain to specify the machine model number and serial number as shown by the label attached to the chain guard that covers the drive motor.

PART# DESCRIPTION LOCATION 105400 Owner's Manual F12 N/A 105402 Spare Parts Kit F 12 N/A 105408 Motor Cover Figure 1 105423 Chain Guard Side Skin (Front Left, Rear Right) Figure 1 105426 Cover Plate Figure 1 105446 Tray Loading (F12 Standard) Figure 1 108024 Scare Parts Kit N/A 108192 Drive Motor w/Pick-up (If serial # is 0590093 or older, use this motor) N/A 108749 Bearing Mount Assembly Figure 1,3 109335 Tray Exit Figure 1 110069 Side Skin Middle Figure 1 110657 Side Arm Cover (4) Figure 1 111355 Tray Loading Short Figure 1 112303 Heater Assembly FW 208V w/wires, reflector, sensor N/A 112304 Heater Assembly FW 240V w/wires, reflector, sensor N/A 112305 Heater Assembly FW 208V w/wires N/A 112306 Heater Assembly FW 240V w/wires N/A 116963 Chain Guard Side Skin (Front Right, Rear Left) Figure 1 123805 Temperature Control 130657 Kit, Motor Reversing N/A 131172 Circuit Board w/mount Figure 4

105400 RV100198

Figure 2,4,

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