Vulcan Hart Griddle 24RRG User Manual

SERVICE MANUAL  
Heavy Duty Gas Griddles  
MODEL  
MLS  
24RRG  
36RRG  
48RRG  
60RRG  
ML-135339-00024  
ML-135340-00036  
ML-135341-00048  
ML-135342-00060  
48RRG  
ITW Food Equipment Group, LLC  
3600 North Point Blvd.  
Baltimore, MD 21222  
FORM F-36986 (Rev. 11-08)  
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BURNER…………………………………………………………………..15  
BURNER TROUBLESHOOTING……………………………………….15  
BURNER REMOVAL……………………………………………………. 15  
BURNER ADJUSTMENT……………………………………………….. 16  
GAS REGULATOR……………………………………………………… 17  
REGULATOR TROUBLESHOOTING………………………………….17  
SYMPTOM-UNIT WILL NOT MAINTAIN CONSISTENT GAS  
PRESSURE………………………………………………………………. 17  
GAS PRESSURE MEASUREMENT…………………………………...17  
PRESSURE TAP LOCATION………………………………………….. 18  
SEQUENCE OF OPERATION…………………………………………. 18  
WIRING DIAGRAMS……………………………………………………. 19  
24-INCH GRIDDLE……………………………………………………….19  
36-INCH GRIDDLE……………………………………………………….20  
48-INCH GRIDDLE……………………………………………………….21  
60-INCH GRIDDLE……………………………………………………….22  
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GENERAL  
INTRODUCTION  
This manual is prepared for the use of trained service technicians and should only be used by those  
who are properly qualified. This manual is not intended to be all encompassing. You should read, in  
it's entirety, the repair procedure you wish to perform to determine if you have the necessary tools,  
instruments and skills required to perform the procedure. Procedures for which you do not have the  
necessary tools, instruments and skills should not be attempted.  
Disconnect the electrical power and follow lockout / tagout procedures  
Certain procedures in this manual require electrical test or  
measurements while power is applied to the machine. Exercise extreme caution at all  
times when attempting these procedures. Before testing, disconnect electrical power  
and follow lock/out tagout procedures, then attach test equipment and reapply power to  
test.  
Procedures in this manual will apply to all RRG models unless specified. No procedure in this  
manual will require the removal or raising of the griddle plate. Pictures and illustrations can be of any  
model unless the picture or illustration needs to be model specific.  
INSTALLATION  
Generally, installations are made by the dealer or contracted by the dealer or owner. Detailed  
installation instructions are included in the Installation and Operation Manual that is sent with each unit.  
However, it should be noted that an improperly installed unit, especially an unlevel unit can lead to  
premature electrical component failures. A unit that is higher in the front will cause the flue gases to  
vent improperly and gather in the front near the electrical components. All RRG models must be  
installed with an externally mounted regulator.  
OPERATION  
Detailed operation instructions are included in the Installation & Operation Manual sent with each  
unit and are also available at WWW.VULCANHART.COM .  
CLEANING  
Detailed cleaning procedures are included in the Installation & Operation manual sent with each  
unit.  
LUBRICATION  
No lubrication is required on this equipment.  
SPECIFICATIONS  
All RRG models operate on 120 volt, 60 hertz, single phase at 1.0 amps. All models are equipped  
with electric solid state thermostats, automatic spark igniters and pilot safety circuit. All models are  
equipped with 27,500 BTU/HR burners as standard equipment. One burner is used for every 12 inches  
of griddle surface. Natural gas models are to operate at 5.0" W.C. manifold pressure and LP models at  
10.0" W.C. manifold pressure with all burners on.  
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COMPONENT LOCATION  
GAS MANIFOLD  
720122  
PRESSURE CHECK PLUG  
PILOT SPARK ASSEMBLY  
713930  
¼” FLEX TUBE  
BURNER ORIFICE  
TEMPERATURE  
CONTROLLER  
498438  
SAFETY IGNITION MODULE  
498443  
DUAL SOLENOID VALVE  
713656  
KNOB  
498438-1  
3/8” FLEX TUBE  
PILOT ADJUSTMENT VALVE  
719194  
INDICATOR LIGHT  
720017  
POWER SWITCH  
810280-1  
36RRG CONFIGURATION SHOWN  
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EXTERIOR PANELS  
CONTROL PANEL  
FLUE  
Disconnect the electrical  
power and follow lockout  
/ tagout procedures  
BACK PANEL  
BULLNOSE  
The Control Panel holds the  
thermostats, indicator lights  
and power switch.  
REMOVAL  
1. Remove the four screws  
securing the front of the  
control panel. There are  
two screws at each end  
of the panel.  
2. Remove the screws that  
secure the bottom of the  
control panel to the  
underside of the chassis.  
3. Pull the control panel  
forward and lay face  
down directly in front of  
the unit while servicing.  
4. Reverse the procedure to  
install.  
CONTROL PANEL  
IDENTIFICATION PLATE  
BACK PANEL  
BULLNOSE  
Disconnect the electrical power and  
follow lockout / tagout procedures  
It will be necessary to remove the back panel when changing a  
burner, temperature probe or to remove excessive grease build up  
from the flue area.  
REMOVAL  
1. Disconnect gas supply at griddle.  
2. Remove all screws from rear of griddle securing the back panel.  
3. Reverse the procedure to install.  
Disconnect the electrical  
power and follow  
lockout / tagout  
procedures  
The Bullnose acts as a front  
rail or shelf during griddle  
operation.  
REMOVAL  
1. Remove the Control  
Panel.  
IDENTIFICATION PLATE  
2. The bullnose assembly is  
secured with several  
screws, one at each end  
of the bottom of the  
assembly and several  
more (depending on  
size) facing the griddle  
plate.  
The identification plate contains the unit’s full model and serial  
number along with BTU rating and clearance information. The  
identification plate is located on the right side panel towards the  
front of the unit.  
FLUE  
The flue is the outlet for gases left over from combustion and  
excess heat. The flue should never be blocked or covered.  
3. Reverse the procedure  
to install.  
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THERMOSTAT  
WIRING CONFIGURATION  
FRONT VIEW  
The thermostat is a solid state control. The thermostat supplies power to the burner solenoid valves  
and indicator lights when turned on or until the temperature setpoint is reached.  
Disconnect the electrical power and follow lockout / tagout procedures  
THERMOSTAT TROUBLESHOOTING  
SYMPTOM – BURNER WILL NOT COME ON  
1. Check for loose or excessively greasy/dirty connections at thermostat terminals  
2. Check that thermostat is set higher than griddle plate surface temperature.  
A. Check for 120 voltage going to L1 terminal on thermostat  
B. If no voltage, check wiring and power switch.  
3. Check safety ignition module.  
4. Check for resistance (approx. 50 ) from L2 wire to ground when safety circuit should be made.  
A. If no resistance, check that pilot is lit and check safety ignition module.  
SYMPTOM – GRIDDLE SURFACE TEMPERATURE IS MORE THAN ±5°F OF THERMOSTAT SET  
POINT  
1. Ensure that you are using a high quality, calibrated surface temperature measuring device.  
A. Do not use an infrared thermometer – these are highly inaccurate on a griddle plate.  
B. Refer to instructions on page 8 for proper placement of probe and method.  
2. Check that burners are properly adjusted.  
3. Check that burner valves are operating correctly.  
4. Check that there are no burner orifice obstructions  
5. Check that the high temp. thermostat probe wire insulation is completely covering the wire. If  
you have found no problems in steps 1 – 5, proceed page 9 for calibration instructions.  
6. If thermostat will not calibrate after all previous steps – replace thermostat.  
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Disconnect the electrical power and follow lockout/tagout procedures  
THERMOSTAT REMOVAL  
1. Remove the control panel  
2. Remove the knob  
3. Label and disconnect the wires  
4. Remove the thermostat retaining nut on the knob shaft.  
5. Reverse procedure to install while being careful to install the thermostat in the same orientation.  
TEMPERATURE PROBE  
The temperature probe is an embedded K  
type thermocouple assembly.  
498432-A  
Disconnect  
power and  
lockout/tagout procedures  
the  
follow  
electrical  
TEMPERATURE PROBE REMOVAL  
1. Remove the control panel  
2. Remove the back panel  
3. Label and disconnect the lead wires at  
the temperature controller  
4. Unthread the probe retaining nut and  
remove the probe from the back of the  
unit.  
TEMPERATURE PROBE INSTALLATION  
1. Insert lead wires from back of heatshield  
through to temperature controller.  
2. Apply a thin coating of high temp(500°  
F min. rated),copper based heat transfer  
and anti-seize compound to the probe tip  
and retaining nut.  
3. Insert probe end into plate socket and  
hand tighten probe retaining nut.  
4. Tighten the probe an additional ½ turn  
only with a wrench. Over tightening can  
strip threads and damage probe tip.  
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ADJUSTMENTS  
CALIBRATION  
1. Each temperature controller controls a 12” zone  
of the griddle. Using Surface Probe  
a
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 ±5°F. If not,  
continue to Step 4.  
4.  
a. Set the temperature controller to  
350° F. DO NOT allow the knob to  
turn. Carefully remove the knob  
from the temperature control  
shaft.  
Step 4a. Set knob &  
check temperature.  
Remove knob  
b. Loosen screws on the back of  
knob and turn the transparent ring  
around the black knob to the  
desired position. Knob will have to  
be placed back on the shaft to  
verify adjustment.  
Step 4b. – Adjust  
the position of outer  
knob ring relative to  
black knob body &  
verify temperature  
setting  
IMPORTANT: NEVER ADJUST THE  
SCREW ON THE BACK SIDE OF THE  
TEMPERATURE CONTROLLER. This  
will ruin the factory calibration; the  
temperature controller will no longer  
operate properly and will need to be  
replaced.  
Step 4c. –Replace  
knob and verify the  
reading. Carefully  
remove the knob &  
tighten screws  
5. Once calibration is achieved, tighten the  
knob screws.  
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# 3 TERMINAL  
# 2 TERMINAL  
TEMPERATURE  
CONTROLLER  
# 1 TERMINAL  
POWER  
SWITCH  
INDICATOR  
LIGHT  
POWER ON/OFF SWITCH  
The Power Switch controls the power supply to all other electronic components.  
Disconnect the electrical power and follow lockout / tagout procedures  
POWER SWITCH TROUBLESHOOTING  
SYMPTOM – NO POWER BEING SUPPLIED TO THE UNIT  
1. Check for loose or excessively greasy/dirty connections at terminals.  
2
With power wires disconnected check for continuity/resistance between the 1 and 2 terminals  
A. If continuity/resistance with switch in OFF position – replace switch  
B. If no continuity/no resistance with switch in ON position – replace switch  
3. Check for 120 voltage from #2 terminal to ground  
A. If no voltage – check main wiring from j box and power cord/plug  
B. If getting voltage to #2 terminal – check voltage to #1 terminal to ground with switch in  
“on” position.  
1. If no voltage – replace switch  
POWER SWITCH REMOVAL  
1. Remove the control panel.  
2. Label and disconnect the wires to the power switch.  
3. Squeeze the switch retainers and slide the switch out through the front of the  
control panel.  
4. Reverse the procedure to install and check for operation.  
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INDICATOR LIGHT  
The indicator light illuminates fully to indicate that the corresponding thermostat and burner have turned  
on and gas is flowing through the corresponding solenoid valve. The indicator light will illuminate at a  
lower intensity when the pilot safety circuit is being made (pilot lit) but the corresponding burner  
solenoid valve and thermostat are not on. The indicator light will exhibit no illumination if the pilot safety  
circuit is not made (pilot not lit).  
INDICATOR LIGHT TROUBLESHOOTING  
SYMPTOM – LIGHT DOES NOT COME ON WHEN THERMOSTAT AND BURNER ARE ON.  
1. Check for loose or excessively greasy/dirty terminal connections  
2. Check for approx. ½ line voltage between the two indicator light terminals with the  
corresponding burner and thermostat off.  
A. If no voltage – check wires coming in from the corresponding safety ignition module to the  
solenoid to the light for shorts or breaks.  
3. With thermostat on and corresponding burner lit – check for 120 voltage between both wires  
at the light.  
A. If no voltage – check wires coming from the corresponding thermostat to the solenoid to the  
light for shorts or breaks. Check thermostat and safety ignition module  
B. If you have 120V – replace indicator light.  
Disconnect the electrical power and follow lockout / tagout procedures  
INDICATOR LIGHT REMOVAL  
1.  
2.  
3.  
4.  
Remove the control panel  
Label and disconnect wires to the light  
Squeeze the light retainers and slide the light out through the front of the control panel  
Reverse the procedures to install and check for proper operation  
SAFETY IGNITION MODULE  
The safety ignition module is a direct  
spark ignition control that utilizes a  
microprocessor circuit for ignition and  
flame sensing. The flame sensing is  
achieved via flame rectification. The unit  
will continue to spark and keep the  
corresponding solenoid valves locked out  
until a minimum flame current of 1.0 μA is  
achieved.  
Pin 1  
Pin 2  
Pin 3  
Pin 4  
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Disconnect the electrical power and follow lockout / tagout procedures  
SAFETY IGNITION MODULE TROUBLESHOOTING  
SYMPTOM – NO SPARK BETWEEN PILOT HEAD AND ELECTRODE  
1. Check for loose or greasy/dirty connections at all terminals (including electrode wire)  
2. Check for 120 voltage from pin 4 wire to ground.  
a. If no voltage check on/off switch and wiring for shorts or breaks  
3. Check electrode wire for damage and continuity – if damaged or no continuity change  
spark/pilot assembly  
a. Check spark gap between electrode and pilot head. The spark gap should be between  
.094” to 0.156” – or approx. 1/8”.  
4. If component has passed above checks and is not sparking – then replace ignition module.  
SYMPTOM – ELECTRODE CONTINUALLY SPARKS AFTER PILOT IS LIT  
1. Check that electrode is engulfed by pilot flame  
2. Increase pilot flame height  
3. Check electrode and electrode wire for damage  
4. Check that power cord grounding wire is securely attached to J box.  
5. Check that ground wire from pin 1 is securely grounded to chassis.  
SYMPTON – BURNER SOLENOID VALVE OPENS WITHOUT ESTABLISHED PILOT FLAME  
1. Check burner solenoid valve.  
2. Check for voltage from pin 2 wire of safety ignition module  
a. Replace safety ignition module if voltage  
IGNITION MODULE REMOVAL  
1. Remove the control panel.  
2. Label and disconnect the wires from the igniter module.  
3. Disconnect the electrode wire and control wire harness.  
4. Remove the two mounting bolts.  
5. Remove the safety ignition module.  
6. Reverse the procedure to install and check for proper operation.  
SOLENOID VALVES  
The RRG series griddles use both single and dual solenoid valves in differing applications. A single  
or dual valve can be either a pilot valve or main burner valve. Pilot valves can be identified by the fact  
that they will have adjustment screws for the pilot flame at the output of the valve body. Pilot solenoid  
valves will receive power and remain on as long as the power switch is in the ON position. Main burner  
solenoid valves will remain on until the thermostat set point has been satisfied.  
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INPUT GAS LINE  
IN BACK CENTER  
RETAINING SCREW  
OUTPUT  
GAS LINES  
DOUBLE SOLENOID VALVE  
Disconnect the electrical power and follow lockout / tagout procedures  
SOLENOID VALVE TROUBLESHOOTING  
SYMPTOM – NO GAS FLOW TO BURNER  
1. Check terminals for loose or greasy/dirty connections  
2. Check gas pressure – check for orifice obstructions.  
3. With thermostat, indicator light and power switch on – check for 120 voltage between the two  
terminals on the solenoid.  
A. On pilot solenoid if no voltage – check wiring and on/off power switch  
B. On main burner solenoid if no voltage – check wiring, safety ignition module and  
thermostat  
4. If you have 120 voltage between the two terminals after performing steps 1- 3, replace the  
solenoid valve.  
5. Check for a shorted coil by checking resistance between the two terminals with the wires  
disconnected. Readings of 100 ohms or less would indicate a shorted coil, replace the  
solenoid.  
SOLENOID VALVE REMOVAL  
Shut off gas supply  
1. Remove the control panel.  
2. Label and disconnect the wires to the solenoid terminals.  
3. Remove the two retaining screws that are holding the valve body in the bracket.  
4. Disconnect the input compression fitting and the output compression fitting(s).  
5. Remove the solenoid valve  
6. Reverse the procedure to install. Be careful to attach the input lines to the ports on the valve  
body that are stamped IN  
7. Verify gas pressure and check for proper operation.  
All gas joints disturbed during servicing must be checked for leaks.  
Check with a soap and water solution. Do not use an open flame.  
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PILOT  
The RRG Series Griddles utilize a solenoid valve with  
a brass pilot valve to control gas flow to pilot burners.  
One to three pilot flames can be fed by one valve –  
one leg of which may be branched.  
BRASS PILOT  
VALVE  
PILOT TROUBLESHOOTING  
SYMPTOM – PILOT WILL NOT LIGHT  
1. Check pilot adjustment at solenoid valve  
2. Check that power switch is on  
3. Check that pilot solenoid valve is working  
4. Check that safety ignition module and power switch are working  
5. Check gas pressure  
6. Check for air in the line  
PILOT ASSEMBLY REMOVAL  
Disconnect the electrical power and follow lockout / tagout procedures  
Shut off gas supply  
1. Remove control panel. Reaching  
underneath the front of the unit,  
remove the pilot tube fitting and  
disengage the pilot tube from the pilot.  
2. Reaching underneath the front of the  
unit, remove the pilot bracket retaining  
screw(#2 Phillips) and remove the  
entire assembly out through the pilot  
access cutout and out from under the  
unit.  
3. Disconnect the electrode wire from the  
from the safety ignition module.  
4. Remove the pilot from the bracket.  
5. Reverse procedure to install  
6. Verify gas pressure and check for  
proper operation  
BRACKET RETAINING SCREW  
PILOT ASSEMBLY  
ELECTRODE  
PILOT  
ACCESS  
CUTOUT  
All gas joints disturbed during servicing must be checked for leaks.  
Check with a soap and water solution. Do not use an open flame.  
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HELPFUL HINT – If the unit is attached to a flexible gas line, you can extend the bullet feet out to their  
fullest extension to raise the griddle and allow yourself more clearance while reaching under the unit.  
Remember to relevel the unit if you chose to do this.  
BURNER  
The RRG Series Griddle utilizes U-shaped burners with a single center inlet for every 12 inches of  
griddle width. Each burner is rated for 27,500 BTU/hr.  
Disconnect the electrical power and follow lockout / tagout procedures  
BURNER TROUBLESHOOTING  
SYMPTOM – ALL BURNERS HAVE A LOWER OR HIGHER FLAME THAN NORMAL.  
1. Check gas pressure  
SYMPTOM – ONE OR MORE BURNERS HAVE LOWER FLAME LEVEL THAN THE OTHERS.  
1. Check gas pressure  
2. Check burner orifice for obstructions  
3. Adjust burner air shutter  
4. Check solenoid valve  
SYMPTOM – ONE BURNER HAS A DELAYED IGNITION; A SEVERAL SECOND LAPSE BETWEEN  
THE INDICATOR LIGHT TURING ON AND WHEN THE BURNER ACTUALLY LIGHTS.  
1. Check gas pressure  
2. Check that burner locater pin is properly seated with retaining clip attached  
3. Check that burner ignition ports, pilot flash tube and pilot burner are all aligned.  
4. Check burner shutter adjustment  
5. Check pilot flame adjustment  
6. Check thermostat, safety ignition module and solenoid valve operation.  
BURNER REMOVAL  
Shut off gas supply  
1. Remove the back panel  
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2. Reach through the back of the unit. Squeeze the burner retaining clip and slide off burner  
retaining pin.  
3. Lift the burner up so the retaining pin clears the corresponding hole in the chassis, then pull  
the burner out through the back of the unit.  
4. Replace by inserting the burner through the rear of the unit and engaging the burner venturi  
onto the burner orifice at the front of the unit.  
5. Seat the retaining pin in the hole in the chassis and attach the retaining clip.  
6. Remove the control panel to check that the venturi is properly fitted over the orifice.  
7. Reassemble the control and back panels, then check for proper operation.  
BURNER ADJUSTMENT  
For efficient burner operation, it is important that a proper balance of gas volume and primary air  
supply is maintained to give complete combustion. Insufficient air supply results in a yellow streaming  
flame. Primary air supply is controlled by the air shutter on the front of the burner venturi. Loosen the  
screw on the venturi and adjust the air shutter to just eliminate yellow tips on the burner flames. Lock  
the air shutter in place in place by tightening the screw. Repeat this procedure as necessary with all  
burners.  
BURNER CLIP  
(UNDERNEATH)  
FLASH TUBE  
PILOT ASSY  
IGNITION PORTS  
AIR SHUTTER  
ORIFICE  
MAIN BURNERS  
These photos are for reference – it should not be necessary to remove the griddle top to perform the  
procedures listed in this manual.  
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GAS REGULATOR  
The RRG series units must have an  
exterior machine gas regulator installed. The  
units are shipped with a regulator that has a  
vent limiter.  
installed as close as possible to the unit in a  
horizontal, upright position for optimal  
These regulators must be  
VENT LIMITER  
ADJUSTMENT  
COVER  
performance.  
They are adjusted by  
removing the adjustment cover – then by  
turning the adjustment screw clockwise to  
increase and counter clockwise to decrease.  
The regulator and griddle can be damaged  
by gas pressures that exceed 14” W.C. or ½  
psig.  
Natural Gas Regulator 408279-25  
LP Gas Regulator  
408279-21  
REGULATOR INSTALLED IN A HORIZONTAL,  
UPRIGHT POSITION  
REGULATOR TROUBLESHOOTING  
SYMPTOM – UNIT WILL NOT MAINTAIN CONSISTENT PRESSURE  
1. Check that vent limiter is not clogged by grease and debris  
2. Check store gas pressure before regulator with all equipment on that line turned on and  
consuming gas  
A. For natural gas should be between 7” and 14” W.C.  
B. For propane gas should be between 12” and 14” W.C.  
3. Check that regulator is installed in a horizontal, upright position  
4. If no problems found in steps 1 – 3, replace the regulator  
GAS PRESSURE MEASURMENT  
1. Set the power on/off switch to the OFF position.  
2. Turn the gas supply off at a manual shutoff valve.  
3. Remove the control panel.  
4. Remove the pressure tap plug from the far left/#1 burner port and attach manometer  
5. Turn gas back on and turn power switch to the ON position  
6. Turn all thermostats on to the maximum setting so that all burners are on.  
7. Turn all the equipment on the same supply line on.  
8. Check gas pressure  
9. Gas pressure should read 5” W.C. for natural and 10” W.C. for propane gas.  
10. Turn off the power switch.  
11. Turn gas supply off, disconnect manometer and reinstall pressure tap plug.  
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12. Turn power switch and gas supply back on.  
All gas joints disturbed during servicing must be checked for leaks.  
Check with a soap and water solution. Do not use an open flame.  
PRESSURE TAP AT #1 BURNER  
SEQUENCE OF OPERATION  
Operation is the same for all size griddles. The neutral wire from the power source is directly  
connected to each thermostat and each safety ignition module.  
1. The power on/off switch is set to the ON position.  
2. Voltage is applied to the following terminals  
A. Terminal L1 on each thermostat.  
B. Pin 4 terminal of each safety ignition module.  
C. Both terminals of the pilot solenoid – energizing the solenoid.  
3. The igniter electrode sparks against the pilot head and lights the pilot burner  
4. When the pilot flame is sensed – the igniter stops sparking and the igniter safety module allows  
voltage to pass to one terminal of each of the corresponding burner solenoid valves and one  
terminal of each indicator light – the indicator light illuminates at dim.  
5. If the griddle plate temperature is lower than the thermostat set points - the thermostat(s) will  
send voltage to the remaining burner solenoid terminal and remaining indicator light terminal.  
A. The solenoid will then energize - gas flows to the corresponding burner and is ignited  
by the pilot flame.  
B. The corresponding indicator light will go from dim to full illumination.  
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WIRING DIAGRAMS  
WIRING DIAGRAM – 24-INCH GRIDDLE  
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WIRING DIAGRAM – 36-INCH GRIDDLE  
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WIRING DIAGRAM – 48-INCH GRIDDLE  
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WIRING DIAGRAM – 60-INCH GRIDDLE  
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