Nieco 952G 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.

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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

4
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

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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 Quick-
Disconnect 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 quick-
disconnect 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.

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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 pres-
sures 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 manu-
facturers 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 proce-
dure. Start broiler and test for proper operation.

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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 maxi-
mum 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 connec-
tor, 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 connec-
tor should be installed with a "lazy" loop for mini-
mum tension.
Note: Gas appliances should be disconnected
prior to maximum movement. (Minimal move-
ment is possible to connect hose.)
WRONG
Avoid sharp bends and
kinks when pulling equip-
ment away from wall.
RIGHT
Minimum pull of equip-
ment is permissible for
accessibility to quick dis-
connect device.

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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 5
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)

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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.

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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 tem-
perature 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 acci-
dental movement.
WARNING
Never set the ATC control knob at a setting high enough to keep the broiler in continuous high gas pres-
sure. 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 tem-
perature 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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D. PARTS AND LOCATION
Model 952 Gas - Feed End View
Model 952 Gas - Right Side View

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Model 952 Gas - Left Side View
Model 932 Gas - Feed End View
P/N 8455

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Model 932 Gas - Right Side View
Model 932 Gas - Left Side View
P/N 8455

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Model 922 Gas - Feed End View
Model 922 Gas - Right Side View

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Model 922 Gas - Left Side View

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E. ASSEMBLY/DISASSEMBLY AND CLEANING
If this appliance is connected to the gas supply by a flexible gas line and quick disconnect coupling, it must also be con-
nected to a restraining device (see installation instructions). If the appliance is moved and then returned to its original
position, it must be reconnected to the restraining device and the casters locked before resuming operation.
1. Clear machine of all food products. Allow the machine to run for ten minutes empty in order to burn off the residue on
the belt. Turn Main Power and Motor switches off. Allow the machine to cool before you disassemble.
2. Remove the Side Panels by 2 3
lifting up and off. Wipe clean
with a degreaser.
FROM THE FRONT OF THE BROILER
3. Remove the Patty Feeder by
lifting up and out. Clean daily
using soap and water.
4. Remove the Upper Burner 4 5
Front Reflector, and clean
with soap and water.
5. Remove the Grease Pan by sliding
it out the front. Clean daily using
soap and water.
6. Remove the Belt Scraper. Notice 6 7
the position it sits in before
removing, so that you can replace
it properly. Clean daily using soap
and water or degreaser.
7. With a plastic spatula, scrape
the excess grease and meat
from the meat platen into
the Grease Box, and remove the
Grease Box and Insert. Dispose
of the grease properly, and wash
using soap and water. Sanitize 8
the insert.
8. Wipe clean and sanitize the Meat
Holding Platen.

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FROM THE LEFT SIDE OF THE BROILER
9. Remove the Burner Access Cover. 9 10
10. Slide the Lower Burners out and
remove the Protective Shields.
Clean the shields by scraping off
any built up residue, then soak in
soap and water. Clean the shields
daily. This will help to prolong
the life of the burner and keep
the broiler cooking properly.
FROM THE BACK OF THE BROILER
11. Remove the awning by lifting up 11 12
and off. Clean using soap and
water.
12. Remove the Return Pan by lifting
off the pegs and sliding out. Clean
and sanitize the pan and the
Teflon Sheet. The Teflon Sheet
can be flipped over if one side
becomes worn.
13. Remove the Stripper Blade. 13 14
Scrape any built up residue
from the blade. Clean by soaking
in soap and water. Sanitize.
14. Remove the Lower Burner
Reflector. Notice the position
of the piece before removing it,
so that you can re-install it
properly. Clean by soaking
in soap and water.

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WEEKLY CLEANING
15. Remove the Lower Burners 15
through the access hole in
the side of the broiler.
Clean the Distributor Screen
and Venturi in the same fashion
as the Upper Burners. Refer
to instruction 16 below.
16. Remove the Upper Burners 16
and clean as follows:
A. Remove Reverberator and clean
with a stiff bristle brush.
REPLACE REVERBERATOR AT
THE FIRST SIGN OF BREAKAGE.
DO NOT SOAK OR SUBMERGE THE BURNERS IN WATER. WATER WILL DAMAGE THE GASKET SEAL CAUS-
ING IMPROPER BURNER PERFORMANCE.
17. Wipe off the frame and other internal parts of the broiler. Do not spray anything (i.e. oven cleaner) inside the broiler.
B. Clean Burner Screen with a stiff
bristle brush.
HOLD BURNER WITH THE SCREEN
FACING DOWN WHILE BRUSHING.
This prevents particles from dropping
down and lodging inside the burner.
C. Clean Burner Venturi with a stiff
bristle brush.
HOLD BURNERS SO THAT PARTI-
CLES WILL NOT DROP INSIDE.

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F. CONVEYOR BELT REMOVAL
Before beginning, notice the way the belt runs through the broiler. Also notice the direction the knuckles face. Be sure to
re-assemble in the same way.
1. Run belt until the Master Link is 1
near the front idler shaft.
2. Lift shaft and Teflon Blocks up, 2 3
and slide the blocks out.
3. Unhook the Master Link.
To reassemble, reverse the procedure. Be sure to reassemble the belt with the knuckle opening facing away from the
direction of travel.

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G. CONVEYOR BELT TENSION
Maintain proper tension on the conveyor belts to prevent jamming. Bearing spacers (pictured below) are
supplied with the broiler to make minor tension adjustments. Major tension adjustments are made by
removing a link or links from the belt.
The diagram on the left shows the spacer in the stored position. The diagram on the right shows the
spacer behind the teflon bearing tightening the belts.
Belt tension should be checked monthly. To do this, allow the machine to cool, then grip the idler shaft at
each end and pull on it. If the shaft and bearings move 3/16” or more, the spacers should be placed
behind the bearings to tighten the belts. If the spacers are already behind the bearings, return them to
the stored position and remove a link from the conveyor belt.
BROIL BELT PROBLEMS
Interference with stripper blade:
The most common belt problem to be expected is the physical interference of the belt with the stripper
blade. This is caused by bent or warped rods on the meat belt, and can be fixed by replacing the rods
that are causing the problem. Other causes are bent stripper blades, or utensils jammed in the belt.
Blocked belts:
When trouble shooting drive problems, it is important to ensure that the belt is not being blocked. To do
this, detach the drive chain and turn the meat belt by hand. The belt, with the motor detached, should
turn freely and easily. If the blockage has occurred which is preventing the belt from turning, the block-
age should be removed before the drive chain is re-attached. The drive chain can be easily removed
from the drive sprocket (on the motor shaft) by loosening the mounting bolts and raising the motor.