Vulcan-Hart 24RRG, ML-135339-00024, ML-135340-00036, 60RRG, 36RRG User Manual

SERVICE MANUAL

Heavy Duty Gas Griddles

MODEL

24RRG ML-135339-00024
36RRG ML-135340-00036
48RRG ML-135341-00048
60RRG ML-135342-00060

www.vulcanhart.com

MLS

48RRG

ITW Food Equipment Group, LLC

3600 North Point Blvd.

Baltimore, MD 21222

FORM F-36986 (Rev. 11-08)

TABLE OF CONTENTS

INSTALLATION…………………………………………………………..
OPERATION……………………………………………………………...
CLEANING………………………………………………………………..
LUBRICATION……………………………………………………………
SPECIFICATIONS……………………………………………………….
COMPONENT LOCATION……………………………………………...
CONTROL PANEL……………………………………………………….
BULLNOSE……………………………………………………………….
BACK PANEL…………………………………………………………….
IDENTIFICATION PLATE……………………………………………….
FLUE……………………………………………………………………….
THERMOSTAT…………………………………………………………...

THERMOSTAT TROUBLESHOOTING.............................................

SYMPTON-BURNER WILL NOT COME ON………………………….

SYMPTON-GRIDDLE SURFACE TEMPERATURE IS MORE

THAN 5° F OFF THERMOSTAT SETPOINT………………………….
THERMOSTAT REMOVAL……………………………………………...

TEMPERATURE PROBE……………………………………………….

TEMPERATURE PROBE REMOVAL………………………………….
TEMPERATURE PROBE INSTALLATION……………………………

ADJUSTMENTS………………………………………………………….
CALIBRATION……………………………………………………………
POWER ON/OFF SWITCH……………………………………………...

POWER SWITCH TROUBLESHOOTING……………………………..
SYMPTON-NO POWER SUPPLIED TO UNIT………………………..
POWER SWITCH REMOVAL AND INSTALLATION………………...

INDICATOR LIGHT………………………………………………………

INDICATOR LIGHT TROUBLESHOOTING…...................................

SYMPTON-LIGHT DOES NOT COME ON WHEN THERMOSTAT

AND BURNER ARE ON…………………………………………………
INDICATOR LIGHT REMOVAL…………………………………………

SAFETY IGNITION MODULE…………………………………………..

SAFETY IGNITION MODULE TROUBLESHOOTING……………….

SYMPTON-NO SPARK BETWEEN PILOT HEAD AND

ELECTRODE……………………………………………………………..

SYMPTON-ELECTRODE CONTINUALLY SPARKS AFTER PILOT

IS LIT………………………………………………………………………

SYMPTON-BURNER SOLENOID VALVE OPENS WITHOUT

ESTABLISHED PILOT FLAME…………………………………………
SAFETY IGNITION MODULE REMOVAL…………………………….

SOLENOID VALVES…………………………………………………….

SOLENOID VALVE TROUBLESHOOTING…………………………...
SYMPTON-NO GAS FLOW TO BURNER…………………………….
SOLENOID VALVE REMOVAL…………………………………………

PILOT……………………………………………………………………...

PILOT TROUBLESHOOTING…………………………………………..
SYMPTON-PILOT WILL NOT LIGHT………………………………….
PILOT ASSEMBLY REMOVAL…………………………………………

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BURNER…………………………………………………………………..

BURNER TROUBLESHOOTING……………………………………….
BURNER REMOVAL…………………………………………………….
BURNER ADJUSTMENT………………………………………………..

GAS REGULATOR………………………………………………………

REGULATOR TROUBLESHOOTING………………………………….

SYMPTOM-UNIT WILL NOT MAINTAIN CONSISTENT GAS

PRESSURE……………………………………………………………….

GAS PRESSURE MEASUREMENT…………………………………...
PRESSURE TAP LOCATION…………………………………………..
SEQUENCE OF OPERATION………………………………………….
WIRING DIAGRAMS…………………………………………………….

24-INCH GRIDDLE……………………………………………………….
36-INCH GRIDDLE……………………………………………………….
48-INCH GRIDDLE……………………………………………………….
60-INCH GRIDDLE……………………………………………………….

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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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919

PRESSURE CHECK PLUG

TEMPERATURE
CONTROLLER
498438

SAFETY IGNITION MODULE
498443

DUAL SOLENOID VALVE
713656

COMPONENT LOCATION

GAS MANIFOLD

720122

¼” FLEX TUBE

KNOB
498438-1

3/8” FLEX TUBE

PILOT ADJUSTMENT VALVE
71

4

INDICATOR LIGHT

720017

36RRG CONFIGURATION SHOWN

PILOT SPARK ASSEMBLY
713930

BURNER ORIFICE

POWER SWITCH
810280-1

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EXTERIOR PANELS

CONTROL PANEL

BULLNOSE

CONTROL PANEL

BACK PANEL

FLUE

BACK PANEL

IDENTIFICATION PLATE

Disconnect the electrical
power and follow lockout
/ tagout procedures

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.

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.

IDENTIFICATION 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.

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Disconnect the electrical
power and follow
lockout / tagout
procedures

The Bullnose acts as a front
rail or shelf during griddle
operation.

1. Remove the Control
Panel.

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.

3. Reverse the procedure
to install.

REMOVAL

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.

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 Ω) 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.

Disconnect the electrical power and follow lockout / tagout procedures

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