Nieco 952G, 932G User Manual

AUTOMATIC

FOODSERVICE

EQUIPMENT

AUTOMATIC GAS BROILER

MODELS 952G, 932G, AND 922G

OWNER’S MANUAL

IMPORTANT: RETAIN THIS MANUAL IN A SAFE PLACE

FOR FUTURE REFERENCE.

Broiler area must be kept free of combustible materials, and the flow of combustion and ventilation air must not be obstructed. Operating personnel must not perform any maintenance or repair functions. Contact your Nieco Authorized Dealer.

In a prominent location, post instructions to be followed in the event the user smells gas. This information shall be obtained by consulting your local gas supplier.

FOR YOUR SAFETY:

Do not store or use gasoline or other flammable vapors or liquids in

the vicinity of this or any other appliance.

WARNING: Improper installation, adjustment, alteration, service or

maintenance can cause property damage, injury, or death. Read the

installation, operating and maintenance instructions thoroughly before

installing or servicing this equipment.

TABLE OF CONTENTS

A. General Information.....................................................................................................................4

Description

B. Machine Installation.....................................................................................................................5

Pre-Installation Mounting Hood Requirements Clearance Gas Connection Electrical Connection Pre-Operation Check Gas Connectors and Restraining Device

C. Operation ......................................................................................................................................8

Controls and Indicators Gas System Controls Step-by-Step Lighting Procedure Shutdown Procedure Automatic Temperature Control

D. Parts and Location.......................................................................................................................11

Exploded Drawings

E. Assembly/Disassembly and Cleaning........................................................................................16

F. Conveyor Belt Removal...............................................................................................................19

G. Conveyor Belt Tension................................................................................................................20

Broil Belt Problems

H. Troubleshooting Guide................................................................................................................21

I. Specifications...............................................................................................................................24

J. Wiring Diagrams...........................................................................................................................27

A. GENERAL INFORMATION

Model 952 Gas Model 932 Gas

DESCRIPTION

The Nieco Automatic Gas Broiler is a compact self-contained unit designed to broil hamburgers or other food products by use of a conveyorized cooking section. The Models 952, 932 and 922 are return flow units with a built-in heated meat holding section.

The broiler is divided into two sections. The top section uses a conveyor belt system to pass food through the cook zone, where infrared, convection and conduction heat is used to cook the product uniformly on both sides. After the product is cooked, it automatically slides into a heated holding section, where it can be kept until served.

The Model 952 uses 6 burners, 3 on top and 3 on the bottom. The 932 and 922 utilize 4 burners, 2 top and 2 bottom. The 922 is narrower than the 952 or 932.

Model 922 Gas

B. INSTALLATION

PRE-INSTALLATION

Uncrate the broiler, and inspect for shipping damage. Contact the factory if there is obvious damage. Remove the tape securing the machine parts, and install the parts in their proper location. Refer to the Parts and Location section of this manual. If you find concealed damage to any part of this unit, contact your freight carrier immediately. The factory warranty does not cover freight damage.

LEVELING

Make sure the broiler is level. Factory stands are equipped with adjustable casters.

MOUNTING

If the broiler was shipped with a tubular stand, refer to separate tubular stand assembly instructions.

Note: The four legs of the broiler stand are equipped with casters. Always set the brakes on the casters to prevent the broiler from shifting during operation or cleaning.

HOOD REQUIREMENTS

This appliance must be installed under a ventilation hood of adequate size and capacity (see chart).

Model CFM CMH

952 800 1360 932 600 1020 922 400 680

The hood should be at least 6" (152MM) larger in all dimensions than the appliance top, and be 12" to 18" (305MM - 457MM) above the top. Do not obstruct the flow of combustion and ventilation air. An adequate air supply must be available for safe and proper operation.

Note: See the National Fire Prevention Association booklet on ventilation of cooking equipment. Write to: NFPA, 470 Atlantic Ave., Boston, MA 02210. Local codes on venting must also be complied with.

CLEARANCE

For proper installation, the minimum clearance from combustible and non-combustible construction is 6" (152MM) from the back and 6" (152MM) from the front of the machine. Keep appliance area free from combustibles.

To facilitate disassembly and service of the unit a minimum of 24" (610MM) should be allowed on the control panel (right) side of the broiler, as well as in front of the broiler.

GAS CONNECTION

At rated BTU capacity, the gas supply should deliver a pressure of at least 6" water column at the broiler connection for natural gas, and 11" water column for propane gas. Incoming gas supply pressure must not exceed 14" water column for either type of gas.

The appliance was shipped from the factory ready for gas supply hook-up to the shutoff valve under the broiler. For disconnect, a manual valve must be located in the gas supply line upstream from the connecter.

If the machine is installed on a moveable stand; (1) the installation shall be made with a connector that complies with the Standard for Connectors for Moveable Gas Appliances, ANSI Z21.69-1987, and Addenda, Z21.6a-1989, and a quick disconnect device that complies with the Standard for QuickDisconnect Devices for Use With Gas Fuel, ANSI Z21.41-1989, and (2) adequate means must be provided to limit the movement of the appliance without depending on the connector and the quickdisconnect device or its associated piping to limit the appliance movement. (See figures on page 7.)

Note: Appliance installation must conform with all local codes, or in the absence of local codes, with the National Fuel Gas Code ANSI Z223.1-1988. Check all fittings for gas leaks, including pilot tubing and inlet connections as soon as the appliance is connected to the gas supply.

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

Note: This appliance must be isolated from the gas supply piping system by closing its individual manual 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).

In Canada, installation shall be in accordance with CAN/CGA-B149.1 Natural Gas or CAN/CGA-B149.2 Propane Gas, and local codes where applicable.

By public initiative, the State of California has adopted legislation (Proposition 65) which requires manufacturers of many types of products, including gas appliances, to warn consumers of their products that contain chemicals or produce substances listed by the State of California to either cause cancer, birth defects, or other reproductive harm.

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 cancer, birth defects, or other reproductive harm.

ELECTRICAL CONNECTION

Power requirements are stated on the unit nameplate and must be connected accordingly. Before starting broiler, tighten all electrical connections in control box. An electrical diagram is located inside the control box.

Note: This appliance must be electrically grounded in accordance with local codes or in the absence of local codes, the National Electrical Code, ANSI/NFPA No. 70-1990. In Canada, in accordance with the Canadian Electrical Code CSA 22.2, or local codes.

WARNING: This appliance should be connected with a four-pronged grounding plug for your protection against shock hazard. Be sure to plug directly into a properly grounded four-prong receptacle. Do not cut or remove grounding prong from plug.

Note:

This appliance cannot be safely operated in the event of a power failure. No attempt

should be made to operate during a power failure. Disconnect power supply before servicing.

PRE-OPERATION CHECK

Be sure that all parts are installed in the proper location. Refer to OPERATION section for lighting procedure. Start broiler and test for proper operation.

INSTALLING GAS APPLIANCE CONNECTORS AND FLEXIBLE GAS LINES CORRECTLY

RESTRAINING DEVICE INSTALLATION AND USE

This high strength restrainer is to be used with all moveable (castered) appliances. It fully complies with American Gas Association requirements. References: Z21.69, Z83.11, and Z21.41 with current revisions. Installation is quick and positive. In Canada, device is in accordance with CAN 1-6.9-M70 Quick Disconnect Devices for use with gas fuel, and CAN 1-6.10-88 metal connectors for gas appliances.

Correct length for any appliance is simply a matter of loosening two adjuster clips (1) and re-tightening. (3" to 6" shorter than appliance connector is desired length.)

Restrainer is made of heavy duty steel cable, with a strong scissor hood (2) at one end, and an equally strong spring hook (3) at the other. Cotter pin (4) is supplied to secure the installation.

For safety in the kitchen area, and to insure maximum service life, it is vitally important to correctly install connectors.

In order to avoid sharp kinks or excessive bends that could have a damaging effect on the connector, it may be necessary to attach pipe elbows in order to bring the connector into its proper plane. For easy movement of the appliance, the connector should be installed with a "lazy" loop for minimum tension.

Note: Gas appliances should be disconnected prior to maximum movement. (Minimal movement is possible to connect hose.)

WRONG

Avoid sharp bends and kinks when pulling equipment away from wall.

RIGHT

Minimum pull of equipment is permissible for accessibility to quick disconnect device.

C.OPERATION

Control and Indicators

GAS SYSTEM CONTROLS

1. Main Gas Pressure Regulator. 4. Main Gas Solenoid. Controls the gas pressure when the High Gas is off.

5. Manual Gas Valve.

2. High Gas Pressure Regulator. Valve is open when in line with pipe Controls the gas pressure in High Gas mode.

3. High Gas Solenoid.

1 2

3 4

Gas Pressure Gauge

Pushbutton Gas Valve (Red)

5-Amp Fuse

Pilot Ignitor (Red)

Meat Holding Platen Control

Motor Breaker Switch

Motor Speed Control Power Indicator Light (Red) Main Power Switch

High Gas Indicator Light (Amber)

Not Pictured:

Automatic Temperature Control (Behind Control Box)

STEP-BY-STEP LIGHTING PROCEDURE

Before lighting, make sure that all parts are installed in the proper location, all controls are turned off, and the ventilation hood fan is turned on.

1. Turn on Main Power Switch. 1 2

2. Turn on Motor Switch.

3. Set Motor Speed Control knob to 3 4 desired setting. (Use “40” to start).

4. Set Meat Holding Temperature by adjusting the temperature controller. (Use 200° F setting to start).

5. Open the Manual Gas Valve. The valve is 5 6 open when the handle is in-line with the pipe.

6. Push and hold the Red Push Button Valve. This will start the flow of gas to the pilot lights. While holding in the Red Button, push the Ignitor button on the front of the control box. After the pilot lights, hold the Red Valve in for 30 seconds to allow the thermocouple to heat. When you release the Red Push Button, the burners should ignite. If the ignitor is not working, use a long-stem lighter to manually light the pilot.

7. After lighting the broiler, check the gas pressure to be sure it is adjusted to the levels stated on the machine rating plate. Allow the broiler at least 30 minutes to warm up.

SHUTDOWN PROCEDURE

For EMERGENCY shutdown, turn off the Main Power switch and shut off the manual gas valve. For PLANNED shutdowns - clear machine of all food products, turn the motor and main switches off.

CAUTION: Turn all appliance switches off before disconnecting cord from power supply.

AUTOMATIC TEMPERATURE CONTROL (ATC)

The Nieco Automatic Temperature Control (ATC) is a system that operates the broiler at two different energy input rates; a high energy input for initial warm-up and periods of high volume, and low energy for regular operation. This dual input rate and the ATC allow the broiler to operate at a very consistent temperature throughout the day and thus provide a very consistently broiled product. Since the broiler will remain on the lower input rate (low gas) most of the day, a substantial energy savings is realized.

The ATC consists of two gas pressure regulators piped in parallel, a solenoid valve in series with the high gas pressure regulator, a probe to sense the temperature at the loading end of the broiler, and a control unit which is operated by the signals from the probe. The control unit causes the solenoid valve to open and close. When the valve is open, the machine is in high gas mode, and the gas pressure is increased to heat up the broiler.

Under heavy product loads, the temperature sensed by the ATC probe will drop low enough to cause the ATC to open the solenoid valve. When the solenoid valve opens, the amber indicator light on the control panel will light. The ATC will keep the broiler on high pressure until the temperature sensed by the probe returns to the calibrated setting.

CALIBRATING THE ATC

1. Loosen the control knob lock screw and set the ATC control knob to 600° F.

2. Turn on the Main Power Switch.

3. Turn on the Motor Power Switch.

4. Light the broiler following the procedure in this manual.

5. The broiler should be in high gas mode at this time. (Amber light on.)

6. When the broiler reaches 600°, the high gas will shut off, and the broiler will be in low gas.

7. 30 minutes after lighting the broiler, slowly turn the ATC control knob up (clockwise) until the high gas clicks on. This is the idle temperature of the broiler.

8. As soon as the high gas turns on,

slowly turn the ATC down (counter clockwise) 10° to 20°

below the point where the high gas turns on.

9. The control knob setting may need a minor adjustment on the first day of use, in order to maintain 10° to 20° below the normal idle temperature. Once the adjustment is correct, it need not change from day to day unless the broiler operating conditions change.

10. After all adjustments have been made, tighten the control knob lock screw to prevent accidental movement.

WARNING

Never set the ATC control knob at a setting high enough to keep the broiler in continuous high gas pressure. The machine may be damaged, energy costs will be much higher, and some broiler parts may wear out prematurely.

MEAT HOLDING SECTION

The Models 952, 932 and 922 are equipped with a temperature controlled meat holding area beneath the cooking chamber. Finished product automatically slides into the holding area after cooking. Cooking guidelines call for a holding temperature of 155°, and a maximum holding time of ten minutes. The temperature of the holding area can be adjusted for proper performance. Use a setting of 200° F to start, and adjust as necessary.

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