INSTALLATION & OPERATION MANUAL
900RX Heavy Duty Gas Griddles
MODEL
924RX
936RX
948RX
960RX
972RX
MLS
ML-135309-924RX
ML-135310-936RX
ML-135311-948RX
ML-135312-960RX
ML-135313-972RX
936RX
RETAIN THIS MANUAL FOR FUTURE USE
ITW Food Equipment Group, LLC
3600 North Point Blvd.
Baltimore, MD 21222
FORM F-36968 (rev. 3-08)
INSTALLATION, OPERATION AND CARE OF
HEAVY DUTY GAS GRIDDLES
GENERAL
Heavy Duty Gas Griddles are produced with quality workmanship and materials. Proper
installation, usage and maintenance of your griddle will result in many years of
satisfactory performance.
Thoroughly read this entire manual and carefully follow all of the instructions provided
Model
924RX
936RX
948RX
960RX
972RX
Number of Burners
BTU/hr Input Rating
54,000
2
3
4
5
6
81,000
108,000
135,000
162,000
INSTALLATION
Before installing, verify that the type of gas supply (natural gas or propane) agree with
the specifications on the rating plate located inside the griddle front panel. If the supply
and equipment requirements do not agree, do not proceed with the installation. Contact
your dealer immediately.
UNPACKING
This griddle was inspected before leaving the factory. The transportation company
assumes full responsibility for safe delivery upon acceptance of shipment. Check for
possible shipping damage immediately after unpacking. If the griddle is found to be
damaged, save the packaging material and contact the carrier within 15 days of delivery.
Carefully unpack your griddle and make sure that no parts are discarded with packaging
material. A pressure regulator designed to operate with the griddle has been supplied and
must be installed before the griddle is placed into service (Refer to GAS PRESSURE
REGULATOR INSTALLATION in this manual).
LOCATION
The installation location must be kept free and clear of combustibles. When installing,
never enclose the bottom of the griddle with a raised curb or other constructions that
would obstruct flow of air into or out of the griddle. Adequate clearance for air openings
into the combustion chamber must be provided. Make sure there is an adequate supply of
air in the room to replace air taken out by the ventilation system.
Do not permit air to blow directly at the griddle. Avoid open windows next to the griddle
wherever possible. Avoid wall-type fans which create air cross-currents within the room.
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This griddle is Design Certified for installation on a non-combustible counter with 4” legs,
or combustible floor with 25” high stand.
INSTALLATION CLEARANCES
COMBUSTIBLE CONSTRUCTION NON-COMBUSTIBLE CONSTRUCTION
Back:
Right
Left Side
6”
6”
6”
0”
0”
0”
INSTALLATION CODES AND STANDARDS
The griddle must be installed in accordance with:
In the United States of America:
1. State and local codes.
2. National Fuel Gas Code, ANSI-Z223.1/NFPA #54 (latest edition). This shall include but
not be limited to: NFPA #54 Section 10.3.5.2 for Venting. Copies may be obtained
from The American Gas Association Accredited Standards Committee Z223, @ 400
N. Capital St. NW, Washington, DC 20001 or the Secretary Standards Council, NFPA,
1 Batterymarch Park Quincy, MA 02169-7471
NOTE: In the Commonwealth of Massachusetts
All gas appliances vented through a ventilation hood or exhaust system equipped with
a damper or with a power means of exhaust shall comply with 248 CMR.
3. NFPA Standard # 96 Vapor Removal from Cooking Equipment, latest edition, available
from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
In Canada:
1. Local codes.
2. CAN/CSA-B149.1 Natural Gas Installation (latest edition)
3. CAN/CSA-B149.2 Propane Installation Code (latest edition), available from the
Canadian Gas Association, 178 Rexdale Blvd., Etobicoke, Ontario, Canada M9W 1R3
GRIDDLES MOUNTED ON STANDS WITH CASTERS
Griddles mounted on stands with casters must use a
flexible connector (not supplied) that complies with the
Standard for Connectors for Movable Gas Appliances
ANSI Z21.69•CSA6.16, and a quick-disconnect device
that complies with Gas Fuel, ANSI Z21.3•CSA6.9. In
addition, adequate means must be provided to limit
movement of the appliance without depending on the
connector and the quick-disconnect device (or its
associated piping) to limit appliance movement. Attach
the restraining device at the rear of the griddle as
shown in Fig. 3.
Fig. 3.
If disconnection of the restraint is necessary, turn off the gas supply before
disconnecting. Reconnect the restraint prior to turning the gas supply on and returning
the griddle to its installation position.
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Casters are only supplied on a griddle stand. If the griddle is moved for any reason the
griddle should be re-leveled (see LEVELING in this manual).
FLUE CONNECTIONS
Do not obstruct the flow of flue gases from the flue, located at the rear of the griddle. It is
recommended that flue gases be ventilated to the outside of the building through a
ventilation system installed by qualified personnel.
From the termination of the flue to the filters of the hood venting system, a minimum
clearance of 18” must be maintained.
Information on the construction and installation of ventilating hoods may be obtained from
the standard for “Vapor Removal from Cooking Equipment”, NFPA No. 96 (latest edition),
available from the National Fire Protection Association, Batterymarch Park, Quincy, MA
02269.
STANDS
The griddle has an optional 25” high by 30” deep by 24”, 36”, 48”, 60” or 72” wide
stainless steel stand with casters. The two front casters lock. The stand includes a top
shelf with marine edges style lip and a lower shelf.
GAS CONNECTIONS
Gas supply connections and any pipe joint compound must be resistant to the
action of propane gases.
Use a ¾” NPT gas supply line for the griddle inlet, located at the rear of the griddle. All of
flexible and semi-rigid gas supply lines must comply with the applicable ANSI standard.
To ensure maximum operating efficiency this appliance must be connected with a gas
supply line of solid pipe or a commercial type Flexible Connector with the net inside
diameter (I.D.) as large as or larger than the gas pipe inlet on this appliance. Codes
require that a gas shutoff valve must be installed in the gas line upstream of the griddle.
Prior to lighting, check all joints in the gas supply line for leaks.
Use soap and water solution. Do not use an open flame.
After checking for leaks all lines receiving gas should be fully purged to remove air.
TESTING THE GAS SUPPLY SYSTEM
When the gas supply pressure exceeds ½ psig (3.45 kPa), the griddle and its individual
shutoff valve must be disconnected from the gas supply piping system.
When the gas supply pressure is ½ psig (3.45 kPa) or less, the griddle should be isolated
from the gas supply system by closing its individual manual shutoff valve.
GAS PRESSURE REGULATOR INSTALLATION
Gas regulator pressure is preset at 5” Water Column (W.C.) for natural gas, and 10” W.C.
for propane gas. No further adjustment should be required.
Install the regulator as close to the griddle on the gas supply line as possible. Make sure
that the arrow on the underside of the regulator is oriented in the direction of gas flow to
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the griddle (Fig. 1) and the regulator is positioned with the vent plug and adjustment
screw upright (Fig. 2).
Fig. 1
Fig. 2
The supply pressure (upstream of the regulator) should be 7-9” W.C. for natural gas and
11-12” W.C. for propane gas. At no time should the griddle be connected to supply
pressure greater than ½ psig (3.45 kPa) or 14” W.C.
ELECTRICAL CONNECTIONS
Electrical and grounding connections must comply with the
applicable portions of the National Electrical Code and/or other local electrical
codes.
Disconnect the electrical power to the griddle and follow lockout /
tagout procedures.
Appliances equipped with a flexible electric supply cord are provided
with a three-prong grounding plug. It is imperative that this plug be connected into
a properly grounded three-prong receptacle. If the receptacle is not the proper
grounding type, contact an electrician. Do not remove the grounding prong from
this plug.
Power supply for electric ignition is 120 volts, 1 amp, 50/60 Hertz, 1 phase.
Do not connect the griddle to electrical supply until after gas connections are made.
OPERATION
The griddle and its parts are hot. Use care when operating, cleaning
or servicing the griddle.
BEFORE FIRST USE
Before leaving the factory the griddle is coated with vegetable oil as a rust inhibitor.
Remove this film when the griddle plate is being cleaned prior to its first cooking use.
Heat the griddle to 200-300°F to loosen and melt the coating, then clean the surface with
a non-corrosive, grease dissolving commercial cleaner, following the manufacturer’s
directions. Rinse thoroughly and wipe dry with a soft clean cloth. Clean all accessories.
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SEASONING THE GRIDDLE
Season the griddle to avoid possible surface corrosion before first use, and after every
cleaning. Heat griddle to a low temperature (300-350°F) and apply a small amount of
cooking oil – about one ounce per square foot of surface. Use a soft lint-free cloth to
spread the oil over the entire griddle surface to create a thin film. Wipe off any excess oil
with a cloth. Repeat the procedure until the griddle has a slick, mirror-like finish.
CONTROLS
There is one pilot and one safety valve for every two burners except on the 36” and 60”
models. The 36” and 60” models have an odd number of main burners, therefore one of
the sets of pilots and safety valves in these models will control only one main burner.
The pilot burners are aligned with the safety valve bush buttons and pilot sight holes. The
pilot burners are inset 12” from the front panel.
This model features an electric ignition system that is controlled by the power switch. The
power switch turns the electric ignition system off and on only. It is recommended that
the power switch stay in the ON position while the unit is running. The burners and pilots
will continue to work with the power switch in the OFF position until the gas supply to the
unit is cut off.
The pilots are monitored by thermocouples and pilot safety valves. If the pilot goes out
and the corresponding power switch is in the ON position, the igniter will immediately
reignite the pilot. If the pilot does not achieve reignition in a short period of time, the
safety valve will shut-off the gas supply to the pilot and main burners. In the event of a
failure of the electronic ignition system, it is possible to ignite the pilots with an outside
ignition source (such as a lit taper, etc). See pilot lighting procedure on page 8.
Each 12” section of the griddle is independently controlled by a mechanical snap-action
thermostatic valve. The thermostats have an operating range of 200 to 550 degrees.
Once pilots are lit, turning the thermostats to the desired setting is all that is required to
put the unit into service.
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900RX PILOT LIGHTING PROCEDURE
1. Turn all thermostats to the OFF position. Wait 5 minutes to allow any gas that may have
accumulated in the burner compartment to escape.
2. Turn on the main gas shut-off valve.
3. Push the power switches to ON. The switches will illuminate and you will hear a “clicking” sound.
4. Depress and hold the red buttons on the pilot safety valves while the electric igniters light the
corresponding pilots. You will have to monitor the pilot burners through the pilot sight holes. The
pilot burners are aligned with the red buttons on the pilot safety valves and the pilot sight holes.
The pilot burners are inset 12” from the front of the unit.
PILOT BURNER
PILOT SIGHT HOLE
12”
PILOT SAFETY VALVE BUTTON
POWER SWITCH
CUTAWAY VIEW
4. Watch for the pilot burners to ignite. When the gas at the pilot has been burning for about 45
seconds, release the corresponding red button. If the pilot does not remain lit, repeat the
procedure allowing more time before releasing the button.
5. The pilot burners can be lit manually in the event of a failure of the electronic ignition system. If
this happens, repeat steps 1-4 with the power switch in the OFF position. You will have to reach
under the front of the unit and through the pilot cutout to ignite the pilots with an outside ignition
source(such as a lit taper, etc.) while again depressing the corresponding red button.
5. If after completing steps 1 -5 and the pilot does not light, turn off the main gas shut-off to the
unit and contact an authorized service agency.
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USING THE GRIDDLE
To preheat, turn the burners on about 20-25 minutes before cooking.
A uniform and systematic approach to loading the griddle will produce the most consistent
product results.
The griddle plate is steel, but the surface is relatively soft and can be scored or dented by
careless use of a spatula or scraper. Be careful not to dent, scratch, or gouge the plate
surface. Do not try to knock off loose food that may be on the spatula by tapping the
corner or the edge of the spatula on the griddle surface.
ZONE COOKING
This griddle features a tubular U-shaped burner in 12” sections, each controlled by
independent thermostats. Each 12” section is a separate cooking zone, and allows
cooking a wide variety of products over a single griddle plate. The chart below is a
suggested usage of zone cooking.
When zone cooking, it is suggested that you start with your lowest temperature setting at
either side of the griddle, increasing the zone temperature as you move up the zone line.
These zone cooking guidelines will vary depending on product temperatures, size and
shape. This guide should be adjusted to suit your product and operational cooking
preference.
ZONE 1
(300°F)
ZONE 2
(350°F)
ZONE 3
(350°F)
ZONE 4
(400°F)
PRODUCT
PRODUCT
PRODUCT
Steak (Rare)
Stir Fry Vegetables
Salmon
Fish Cakes
Lobster
Sausage
Pancakes
French Toast
Bacon
Omelet
Eggs (Hard Fried)
Eggs (Scrambled)
Burger (Well Done)
Steak (Well Done)
Chicken Breast
Frozen Foods
Hash Browns
Canadian Bacon
Eggs (Sunny Side Up)
Boiled Ham
Steak (Medium Well)
Fresh Burger (Medium Well)
Small Frozen Burger (Medium Well)
Scampi
Pork Chops
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CLEANING THE GRIDDLE
Empty the grease drawer as needed throughout the day and regularly clean at least once
daily.
Clean the griddle regularly. A clean griddle always looks better, lasts longer and performs
better. To produce evenly cooked, perfectly browned griddle products keep the griddle
plate clean and free of carbonized grease. Carbonized grease on the surface hinders the
transfer of heat from the griddle surface to the food, resulting in spotty browning and loss
of cooking efficiency. Carbonized grease tends to cling to griddle foods, giving them a
highly unsatisfactory and unappetizing appearance.
To keep the griddle clean and operating at peak efficiency, follow these procedures:
AFTER EACH USE
Clean the griddle with a wire brush of flexible spatula.
ONCE PER DAY
Thoroughly clean the griddle back splash, sides and front. Remove, empty and wash the
grease drawer in the same manner as an ordinary cooking utensil.
ONCE PER WEEK
Clean the griddle surface thoroughly. Use a griddle stone, screen, or Scotch Bright pad
on the surface as necessary. Rub with the grain of the metal while the griddle is still
warm (not hot). A detergent may be used on the plate surface to help clean it, but be sure
the detergent is thoroughly removed by flushing with clear water.
After removal of detergent the surface of the plate the griddle should be seasoned
according to the instructions in this manual.
Clean stainless steel surfaces with a damp cloth and polish with a soft dry cloth. To
remove discoloration, use a griddle cleaner.
If the griddle usage is very high, consider conducting this weekly cleaning procedure
more than once per week.
CLEANING A CHROME GRIDDLE PLATE
AFTER EACH USE
Clean the griddle with a palmetto brush of flexible spatula. NEVER USE AN ABRASIVE
SCOURING PAD OR GRIDDLE STONE ON A CHROME PLATE SURFACE.
ONCE PER DAY
Thoroughly clean backsplash, sides, and front. Do not hit the backsplash with a spatula
or any other tool. This may create a gap between the splash and griddle plate that is
hard to clean.
Clean stainless steel and chrome surfaces with a damp cloth and polish with a soft dry
cloth.
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ADJUSTMENTS
CALIBRATION
1. Each thermostat controls a 12” zone of the
griddle. Using a Surface Probe temperature
measurement device, observe the temperatures
at the center points of the cooking zones.
These points are located by starting 6” from the
side splash (left or right) and every 12” across
the width of the griddle, with all points located
12” back from the front edge of the griddle
plate.
NOTE: Use of infrared thermometers is not
recommended. These devices are highly
sensitive to surface color (clean or dirty), angle
of reading and distance from the unit.
2. Set thermostats to 350°F and allow to stabilize,
allowing the indicator light to cycle ON and
OFF at least two times.
3. Watch for indicator light to cycle OFF, then
measure the temperature for that zone. The
temperature should be 350°F ±15°F. If not,
continue to Step 4.
4.
a. Carefully loosen the knob set
screw. DO NOT allow the knob to
turn. Carefully remove the knob
Step 4a. Set knob &
check Temperature.
Remove knob
from
the
thermostat
shaft,
exposing the temperature dial.
b. Loosen screws on the temperature
dial and adjust to that the
temperature indicated by the knob
arrow matches the griddle plate
temperature reading. Knob will
have to be placed back on the
shaft to verify adjustment.
Step 4b. – Adjust
temperature dial &
verify temperature
setting
IMPORTANT: NEVER ADJUST THE
SCREW IN THE CENTER OF THE
THERMOSTAT SHAFT. This will ruin the
factory calibration; the thermostat will no
longer operate properly and will need to
be replaced.
Step 5 –Replace
knob & tighten
screws
5. Once calibration is achieved, tighten the
temperature dial screws and knob set
screws.
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LEVELING
The griddle must be level (side-to-side and front-to-back) during operation to ensure
proper performance. Improper leveling can result in uneven temperature distribution, cold
spots, and possibly damage electrical components.
1. Place a level on the griddle.
2. Adjust legs by turning the bullet feet at the bottom of each leg. Using pliers or a
crescent wrench, turn the feet counter-clockwise to increase height, and clockwise to
decrease height until leveling is achieved. Do not extend the legs more than 1-¾”.
PILOT ADJUSTMENT
Using a flathead screwdriver, turn the slotted hex-head pilot adjustment screw clockwise
to decrease the flame, and counterclockwise to increase the flame. Pilot adjustments
should only be performed by Service Personnel.
SHUTDOWN OF GRIDDLE WITH ELECTRIC IGNITION SYSTEM
1. Turn thermostats to the OFF position to cut off burners.
2. Push the power switches to OFF. This will cause electrical power to be turned off to
the igniters.
3. The pilots will remain lit and monitored by the safety valve as long as the main gas
supply is on.
EXTENDED SHUTDOWN
1. Shut off the main gas supply valve.
2. Unplug the griddle electrical supply cord.
3. Apply a heavy coat of vegetable oil over the griddle plate to inhibit rust.
MAINTENANCE
The griddle and its parts are hot. Use care when operating, cleaning
or servicing the griddle.
LUBRICATION
There are no parts on this unit that require lubrication.
VENT
Daily, when the griddle is cool, check the flue and clear any obstructions.
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SERVICE AND PARTS INFORMATION
Contact the Service Agency in your area to obtain service and parts information. For a
When calling for service the following information should be available from the appliance
serial plate: Model Number, Serial Number and Gas Type.
ACCESSORIES
STANDS
The griddle has an optional 24” high by 30” deep by 24”, 36”, 48”, 60” or 72” wide
stainless steel stand with casters or flanged legs. The front casters lock, and flanged legs
may be bolted to the floor. The stand includes a top shelf with marine edges style lip and
a lower shelf. When mounted on a stand with standard legs and properly leveled, the
griddle plate cooking surface should approximately 36” from the floor.
CUTTING BOARDS & TOWEL BARS
Refer to the installation instructions provided with the cutting board or towel bar kit.
FRONT GREASE
CUTTING
FRONT GREASE
STANDARD
FRONT GREASE
TOWEL BAR
BOARD
BULLNOSE
REAR GREASE
STANDARD
BULLNOSE
REAR GREASE
TOWEL BAR
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TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
Heat does not come on
when the thermostat is
turned on
1. Problem with thermostat. (Call for service)
2. Pilot burner not lit. (Call for service)
3. Problem with gas valve (Call for service)
1. Manual gas valve not turned on.
2. Obstructed pilot orifice. (Call for service)
3. Pilot gas turned off at pilot. (Call for service)
4. Problem with pilot safety valve. (Call for service)
5. Problem with thermocouple. (Call for service)
6. ON/OFF switch not in the ON position
Pilot burner will not light
1. Obstructed or wrong size pilot orifice. (Call for service)
2. Gas supply not purged of air. (Call for service)
3. Air blowing pilot out. (Call for service)
4. Problem with pilot safety valve. (Call for service)
5. Thermocouple not in flame. (Call for service)
Pilot burner will not stay
lit
Fat appears to smoke
excessively
1. Temperature set too high.
2. Moisture in food may be turning into steam
Food sticks to griddle or
burned around edges or
contains dark specs
1. Temperature set too high.
2. Griddle surface requires cleaning and/or seasoning.
3. Surface under food not covered with enough cooking oil.
1. Temperature set too high.
2. Food not cooked for long enough time.
Food under-cooked inside
1. Food itself may have off-flavor.
Food tastes greasy or has 2. Food stored improperly before cooking.
objectionable off-flavor
3. Too much griddle fat used.
4. Temperature set too low.
1. Temperature set too high.
2. Griddle surface needs cleaning and/or seasoning.
3. Too much griddle fat used.
Noticeable build-up of
gum on griddle
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