Nieco 940 Gas User manual

AUTOMATIC
FOODSERVICE
EQUIPMENT
AUTOMATIC GAS BROILER
MODELS 940 GAS AND 960 GAS
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.
FORYOUR 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, maintenance
can cause property damage, injury, or death. Read the installation,
operating and maintenance instructions thoroughly before installing
or servicing this equipment.

3
TABLE OF CONTENTS
A. General Information.....................................................................................................................4
Description
B. Machine Installation.....................................................................................................................6
Pre-Installation
Mounting
Hood Requirements
Clearance
Gas Connection
Electrical Connection
Pre-Operation Check
Gas Connectors and Restraining Device
C. Operation ......................................................................................................................................9
Controls and Indicators
Gas System Controls
Step-by-Step Lighting Procedure
Shutdown Procedure
Automatic Temperature Control
Bun Platen Adjustment
D. Parts and Location.......................................................................................................................14
Model 960 & 940
E. Assembly/Disassembly and Cleaning........................................................................................17
F. Conveyor Belt Removal...............................................................................................................21
G. Conveyor Belt Tension.................................................................................................................22
H. Trouble Shooting Guide...............................................................................................................23
I. Wiring Diagrams...........................................................................................................................25

4
A. DESCRIPTION
MODEL 940/960
AUTOMATIC GAS BROILER
WITH ATC
Description
NIECO Model 940/960 Automatic Gas Broilers are compact, self-contained, flow-through units, which automatically broil
hamburgers and grill buns.The broilers employ a 24” wide broil belt and gas burners in the meat cooking section. The
lower bun grilling section uses an electrically heated platen to warm and brown buns which automatically pass beneath
the platen on the 24” wide belt.
Model 940 and 960 Broilers are similar mechanically and electrically, except that the Model 960 has an additional set of
upper and lower burners.
Automatic Temperature Control
Both broilers are equipped with an Automatic Temperature Control (ATC).This device responds to temperature changes
in the cooking chamber by increasing or decreasing the flow of gas to the burners automatically.This automatic adjust-
ment is an important factor in cooking consistency and energy savings.

5
HOW THE MODEL 940/960 WORKS
NIECO Model 940/960 Broilers are divided into two sections. As illustrated below, the conveyorized top section broils
burgers on both sides at the same time using infra-red energy that is regulated by the ATC. Broiled burgers discharge on
the opposite side of the unit with a lightly charbroiled flavor and attractive sear marks on the bottom side.
Buns are heated and grilled in the lower section of the broiler at the same time patties are being broiled in the top
section. Buns are loaded (tops on the left, bottoms on the right) on a conveyorized bun feeder and automatically carried
under an electrically heated platen to the opposite side of the unit.They emerge with a uniformly caramelized, golden
brown surface.

6
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.
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.
LEVELING
Make sure that the broiler is level. Factory stands are equipped with adjustable casters.
HOOD REQUIREMENTS
This appliance must be installed under a ventilation hood of adequate size and capacity:
Model CFM
960 800
940 800
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 ade-
quate 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 com-
plied 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 con-
necter.
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 pro-
vided to limit the movement of the appliance without depending on the connector and the quick-discon-
nect device or its associated piping to limit the appliance movement. (See figures on page 6.)
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.

7
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 individ-
ual 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 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 start-
ing 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 22.1 part 1, 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.

8
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.

9
C. OPERATION
MODEL 940/960
CONTROLS AND INDICATORS
a.Gas Pressure Gauge. Pressure readings should
agree with those listed on the rating plate on the
control box cover. If not, contact your NIECO
authorized distributor.
b. Fuse.
c. High Gas On (amber). High Gas pressure solenoid
is on.
d. Bun Platen Thermostat. Set between 350° and
400° and vary to desired bun caramelization.
e. Pilot Ignitor (orange). Push with pilot button to light
pilot.
f. Motor On/Off Switch. Controls conveyor belt.
g. Main Power On/Off Switch and Indicator Light.
h. Motor Speed Control. Controls conveyor belt
speed.
i. Upper Pilot Button (red). Push to light upper pilot.
j. Bun Platen Height Adjustment. Cams on right and
left side of unit permit height adjustment to
compensate for small bun thickness variations. For
major adjustments add or remove spacers from
underneath platen mounting brackets on top of
platen.
k. Lower Pilot Button (red). Push to light lower pilot.

10
1. Main Gas Valve controls gas input
to equipment.
2. Main Gas Solenoid Valve opens
when broiler main switch is turned
on.Valve closes automatically if
there is a power failure shutting off
gas supply to broiler.
1. Turn on MAIN POWER
switch.
2. Turn on MOTOR POWER
switch.
3. Set MOTOR SPEED control
to desired cooking speed.
(Use a setting of ‘50’ to start.)
4. Turn on BUN PLATEN
THERMOSTAT and set to
desired temperature.
(Use a setting of 450° F to
start.)
OPERATING PROCEDURE
In the following section, a brief step-by step sequence of lighting and operating procedures is given. For
reference, a condensed lighting procedure is located on top of the control box.
Before starting broiler, ensure that all parts are correctly installed, all controls are off, and the ventilation hood is
turned on.
Do not attempt to operate this appliance in the event of a power failure.
CAUTION: Meat stripper blade can cause patty belt damage if incorrectly installed. If relighting
broiler, avoid touching heated surfaces.
STEP-BY-STEP PROCEDURE

11
5. Remove broiler’s RIGHT SIDE
PANEL so you will have access to
pilot light ignition holes. NOTE: This
may not be necessary if your broiler
is equipped with electric PILOT
IGNITOR.
6. Turn on MAIN GAS VALVE located
on lower right side of broiler. See
ATC instructions if applicable.
7A. Light LOWER PILOT BURNER by
pressing lower red button (see 7A).
Hold flame to pilot ignition hole (see
7B). Or press PILOT IGNITION
button on models so equipped. (See
7C.) After pilot ignites, hold button in
for about 20 seconds to insure pilot
will remain ignited.
8. Repeat above procedure with
UPPER PILOT BUTTON and UPPER
IGNITION HOLE.
9. Refer to ATC calibration instructions.

12
10. Load frozen hamburger patties
shingle-fashion on the SELF-
FEEDER TRAY on the upper
section of the broiler. Patties will
automatically feed themselves
onto the rotating patty belt and
exit onto the discharge pan.
11. Place the buns directly on the
bun belt “cut side” up. Load the
tops (crowns) on the right side,
and the bottoms (heels) on the
left.
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 rate of energy input for initial warm-up and high store volume periods, and a low rate of energy input
for lower store volume periods.This dual input rate and the automatic temperature control 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 most of the day (approximately 85% of the time), a substantial
energy savings will be 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 temperature at the loading end of the broiler, and a control unit which is
operated by signals from the probe.The control unit causes the solenoid valve to open and close.When open, the
broiler is in high gas pressure (high energy input).
Under heavy product loads the temperature sensed by the ATC probe will be low enough to cause the ATC to open
the solenoid valve.When the solenoid is open, the amber indicator light on the front panel will be on.The ATC will
keep the broiler in high gas pressure until the temperature sensed by the ATC probe returns to normal.

13
HOW TO CALIBRATE THE ATC
1. Loosen control knob lock screw and set ATC control knob to 600°F.
2. Turn on main ON/OFF switch.
3. Turn on motor ON/OFF switch and set motor speed control so that the broil belt is travelling at the correct
speed for the product.
4. Light the broiler following the lighting procedure in the manual and on the broiler lighting instruction plate.
5. Broiler should be in high gas pressure at this time (5” W.C. natural gas; 11” W.C. propane).
6. When the broiler reaches 600°F, the high gas will be shut off (amber light out) and the broiler will be in low
pressure (3” W.C. nat. gas; 8” W.C. propane.).
7. Forty minutes after lighting the broiler, slowly turn the ATC control knob up (clockwise) until the amber light
(high gas) comes on (photo A).
8. As soon as the high gas comes on, slowly turn the ATC control knob down (counterclockwise) until the
setting is10-20°F BELOW the point where the high gas came on.
9. Tighten control knob lock screw (photo B).
10. The control knob set point may need a minor adjustment the first day of operation in order to maintain the
10-20°F below the normal idle temperature. Once adjustment is correct, it need not be changed from day to
day unless the broiler operating conditions change.
WARNING
Never set the ATC control knob at a setting high enough to keep the broiler in high gas pressure.The machine
may be damaged, energy cost will be much higher, and some broiler parts may wear out prematurely.
SHUTDOWN PROCEDURE
FOR EMERGENCY SHUTDOWN,TURN MAIN POWER SWITCH AND GAS SUPPLY VALVE OFF.
For planned shutdowns, perform the following procedure:
1. Clear machine of all food products.
2. Turn main power switch off.
3. Turn motor power switches off.
4. Turn gas supply valve off.
CAUTION: Always turn machine completely off before pulling power plug.
CAUTION: If a flexible gas line is used it must be disconnected before moving machine.

14
D. PARTS AND LOCATION
940 AND 960 GAS

15
D. PARTS AND LOCATION
940 AND 960 GAS

16
D. PARTS AND LOCATION
940 AND 960 GAS

17
E. ASSEMBLY/DISASSEMBLY & CLEANING
MODEL 940/960
In the following section a brief step-by-
step sequence of the procedures for
broiler disassembly and cleaning is
given. For additional information or
repair, contact your Nieco authorized
distributor.
If a flexible gas line, quick disconnect
coupling and restraining device are
used (see installation section for cor-
rect type and installation) to connect
the broiler to the gas supply, any time
the restraining device is disconnected
it must be reconnected after moving
the broiler back to its originally
installed position, and the casters
locked before operation of the broiler.
1. Turn the machine off (all electrical
power switches, including MAIN
POWER and the gas); wait until
the machine is cool before
attempting to disassemble or
clean.
2. Remove SIDE PANELS by lifting
up and out; clean daily with soap
and water.
3. Remove HOOD END FLAP by
lifting up and out; clean daily with
soap and water.
4. Remove TOP HOOD by lifting up;
clean daily with soap and water.

18
5. Remove GREASE DRAIN CHUTE
and GREASE COLLECTOR BOX;
clean daily with soap and water.
6. Remove REAR HEAT SHIELD
located above patty belt; clean
with soap and water.
7. Remove PATTY CATCH PAN and
INSERT; clean daily with soap and
water.
8. Remove BUN DISPENSER
BLADE; clean daily with soap and
water.
5A. 5B.

19
9. Remove MEAT STRIPPER
BLADE; clean daily with soap and
water.
10. Remove CRUMB TRAY from rear
of machine; clean daily with soap
and water.
11. Remove BUN FEEDER from front
of machine; clean daily with soap
and water.
12. Remove PATTY FEEDER from
front of machine; clean daily with
soap and water.

20
13. Remove GREASE DRIP PAN
from front of machine; clean daily
with soap and water.
14. Remove LOWER BURNER
REAR REFLECTOR; clean daily
with soap and water.
15. Remove T-bar which is located
between top burners. (Not used
with 940, propane or disposable
burners.
16. Remove UPPER FRONT
REFLECTOR by lifting up and
out; clean daily with soap and
water.
17. Remove UPPER BURNERS and
clean weekly as follows:
a. Remove REVERBERATOR and
clean with a stiff bristle brush.
REPLACE REVERBERATOR AT
FIRST SIGN OF WIRE
BREAKAGE.
b. Clean DISTRIBUTOR SCREEN
on burner with a stiff bristle
brush. Always hold burner facing
down while brushing to prevent
particles from dropping inside the
burner box.
c. Clean burner VENTURI with stiff
bristle brush; hold burner so
particles will not drop inside.