948RX
SERVICE MANUAL
Heavy Duty Gas Griddles
924RX
936RX
948RX
960RX
972RX
MSA24
MSA36
MSA48
MSA60
MSA72
ASA24
ASA36
ASA48
ASA60
ASA72
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its 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 be
performed by a trained Vulcan Service Technician.
The reproduction, transfer, sale or other use of this Manual,
without the express written consent of Vulcan, is prohibited.
This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.
A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222
F25383 (0219)
Heavy Duty Gas Griddles
TABLE OF CONTENTS
SERVICES UPDATES ...................................................................................... 3
SERVICE UPDATES ................................................................................... 3
TIS DOCUMENT LIST - 900RX SERIES ................................................................ 3
GENERAL .................................................................................................. 4
INTRODUCTION ....................................................................................... 4
INSTALLATION ........................................................................................ 4
OPERATION ........................................................................................... 4
CLEANING ............................................................................................. 4
SPECIFICATIONS ...................................................................................... 4
TOOLS ................................................................................................. 5
COMPONENT LOCATION .............................................................................. 5
REMOVAL AND REPLACEMENT OF PARTS ............................................................... 6
COVERS AND PANELS ................................................................................ 6
MOMENTARY POWER SWITCH (900RX) .............................................................. 6
ELECTRIC IGNITER (900RX) ........................................................................... 7
BASO SAFETY VALVE ................................................................................. 7
THERMOSTAT VALVE ASSEMBLY .................................................................... 7
BURNER ............................................................................................... 9
PILOT, THERMOCOUPLE ASSEMBLY ................................................................. 9
SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 11
CALIBRATION ........................................................................................ 11
PILOT ADJUSTMENT ................................................................................. 12
GAS PRESSURE MEASUREMENT .................................................................... 12
GAS PRESSURE REGULATOR ADJUSTMENT ....................................................... 13
BURNER ADJUSTMENT .............................................................................. 14
THERMOCOUPLE TEST .............................................................................. 14
ELECTRICAL OPERATION ................................................................................ 16
ELECTRICAL DIAGRAM .............................................................................. 16
TROUBLESHOOTING ..................................................................................... 18
TROUBLESHOOTING ................................................................................. 18
© VULCAN 2019
F25383 (0219) Page 2 of 19
Heavy Duty Gas Griddles - SERVICES UPDATES
SERVICES UPDATES
SERVICE UPDATES
February 2019
• Updated PILOT, THERMOCOUPLE
ASSEMBLY.
November, 2018
• Added TIS Document List.
TIS DOCUMENT LIST - 900RX SERIES
SERVICE TAB
Document Title Document Type
900RX Series Heavy Duty Gas Griddles Service Manual Service Manual
SERVICE TAB (Multimedia)
Document Title Document Type
Repairing Flood-Damaged Food Equipment Misc
900RX Series Heavy Duty Gas Operation & Installation
Manual
AGE, AGM, 900RE, 900RX, and ASA Series Gas Griddle
Grease Chute P/N 498234-A Installation Instructions
Fundamentals of Gas Service Instructions
Rating Plate Locations on Current Vulcan-Hart/Wolf
Range Equipment
TSB 0842 4 Position/3 Heat Switch - Ranges, Ovens,
Broilers
TSB 1037A Hobart to Vulcan "Common" Model Cross
Reference List
TSB 1301 Onwatch Quicklook 72 for Gas Cooking
Equipment
TSB 682 Griddle Lead Wire Upgrading Technical Service Bulletin (TSB)
RobertShaw FS Flame Switch Recall Vulcan & Wolf
Equipment Effected - PN 713933
Operator
Service Instructions
Technical Service Bulletin (TSB)
Technical Service Bulletin (TSB)
Technical Service Bulletin (TSB)
Technical Service Bulletin (TSB)
Temporary Service Instructions (TSI)
PARTS TAB
Document Title Document Type
900RX and MSA Heavy Duty Gas Griddles Parts Catalog Parts Catalog
Page 3 of 19 F25383 (0219)
Heavy Duty Gas Griddles - GENERAL
GENERAL
The griddle and its parts are hot. Use care when operating, cleaning or servicing the griddle.
INTRODUCTION
This Service Manual covers specific service
information related to the models listed on the front
cover and built after March 2010.
Procedures in this manual will apply to all 900RX
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.
MSA griddles have a standing pilot that must be lit
manually. One pilot services two burners via a flame
tube between the burners. The 900RX utilizes a spark
ignition system that has a 'momentarily on' switch that means the switch must be held down for sparking
to take place, and it ceases sparking when released.
The MSA and 900RX have BASO® pilot safety valves
that must be pressed to allow gas to feed the pilot
burner. For the 900RX, the pilot buttons must be
pressed at the same time the power switch is pressed
in order to light the pilot.
INSTALLATION
position until the gas supply to the unit is cut off or the
griddle gas shut-off valve is turned to the OFF position.
The pilots are monitored by thermocouples and pilot
safety valves. If the pilot goes out, 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
source (such as a lit taper). You will have to reach
under the front of the unit and through the pilot cutout
to ignite the pilots while again depressing the
corresponding red button.
CLEANING
Detailed cleaning procedures are included in the
Installation & Operation manual sent with each unit.
SPECIFICATIONS
Stainless steel front, sides and front top ledge. Fully
welded stainless and aluminized steel body frame. 11"
low profile cooking height on 4" legs. 1" thick polished
steel griddle plate with 12 gage, 4" stainless steel back
and tapered side splashes. Grease chute is fully
welded to stop grease migration.
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 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.
The 900RX models feature an electric ignition system
that is controlled by a momentary power switch. The
power switch turns the electric ignition system off and
on only and will only supply power to the igniters when
held down in the ON position. The burners and pilots
will continue to work with the power switch in the OFF
One 27,000 BTU/hr. “U” shaped aluminized steel
burner and mechanical snap action thermostat for
each 12" of griddle width. Chrome thermostat knob
guards. Temperature adjusts from 200° to 550° F.
One pilot safety for every two burners. Manual shutoff valve. 3½" wide stainless steel grease trough.
120V 50/60Hz 1 Amp single phase electric ignition
circuit. Plug type is NEMA 5-15 USA. ¾" rear gas
connection and gas pressure regulator.
A gas pressure regulator supplied with the unit must
be installed.
Check and set the gas pressure after the regulator is
installed.
Manifold pressure should be:
Natural Gas 4.0" W.C.
Propane Gas 10.0" W.C.
Incoming pressure should be 5-9" W.C. for
Natural Gas and 11.0" W.C. for Propane Gas.
Incoming pressure should not exceed 14.0" W.C.
F25383 (0219) Page 4 of 19
Heavy Duty Gas Griddles - GENERAL
TOOLS
• Standard set of hand tools.
• VOM with A/C current tester (any quality VOM
with a sensitivity of at least 20,000 ohms per volt
can be used).
• Temperature tester (thermocouple type).
• U-Tube or Digital Manometer.
• Thread sealant suitable for use with natural or
propane gas.
• Aluminum Foil Tape - McMaster Carr Part No.
7631421 or equivalent.
• Adapter to test thermocouple, Johnstone Supply
Part No. H23-226 or equivalent.
6. Pilot flame adjustment
Top View 924RX
Fig. 3
1. Burner assembly
2. Electric igniter (RX only)
3. Thermostat
4. Orifice
5. Thermostat capillary tube
6. Pilot, igniter (RX only) and thermocouple
Fig. 1
COMPONENT LOCATION
Front View 924RX
Fig. 2
1. Pilot electric ignition system control switch (RX
only)
2. Power cord (RX only)
3. Thermostat
4. Gas shut off valve (RX only)
7. BASO® pilot safety valve
8. Pilot adjustment valve
5. BASO® pilot safety valve
Page 5 of 19 F25383 (0219)
Heavy Duty Gas Griddles - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
FRONT PANEL
1. Turn all thermostats to off position, loosen set
screw securing thermostat knobs and pull off
knobs.
NOT IN OFF POSITION FOR VIEW
Shut off the gas before servicing the
unit and follow lockout / tagout
procedures.
All gas joints disturbed during servicing must be
checked for leaks. Check with a soap and water
solution (bubbles). Do not use an open flame.
NOTE: It will be necessary to remove the back panel
when changing a burner or to remove excessive
grease build up from flue area.
1. Disconnect gas supply at griddle.
Remove screws securing back panel to griddle.
Fig. 4
2. Remove screws securing front panel to griddle.
3. Pull front panel forward and lay aside. If servicing
a 900RX lay front panel face down in front of unit.
4. Install in reverse order.
NOTE: Before installing front panel, check that lineofsight through the front panel to see both pilot burners
and griddle burners. Move any flexible gas tubing, or
capillary tubing that may obstruct the sight holes.
Install in reverse order.
MOMENTARY POWER SWITCH
(900RX)
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
1. Remove FRONT PANEL.
2. Label and disconnect wires from power switch.
3. Squeeze switch retainers and slide switch out
through front of panel.
Fig. 5
BACK PANEL
4. Install in reverse order.
F25383 (0219) Page 6 of 19
Fig. 6
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