Vulcan Materials 924RX, MSA48, 948RX, 972RX User Manual
948RX
SERVICE MANUAL
HEAVY DUTY GAS GRIDDLES
MODELS
924RX MSA24
936RX MSA36
948RX MSA48
960RX MSA60
972RX MSA72
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.
For additional information on Vulcan-Hart Company or to locate an authorized parts
and service provider in your area, visit our website at www.vu lcanhart.com.
A product of VULCAN-HART LOUISVILLE, KY 40201-0696
F25383 (510)
GENERAL
TABLE OF CONTENTS
GENERAL ................................................................................3
Introduction ............................................................................3
Installation ............................................................................ 3
Operation .............................................................................3
Cleaning .............................................................................. 3
Specifications ..........................................................................3
Tools.................................................................................4
Component Location ....................................................................4
REMOVAL AND REPLACEMENT OF PARTS ....................................................5
Covers and Panels ......................................................................5
Front Panel ........................................................................5
Back Panel ........................................................................5
Momentary Power Switch (900rx) ..........................................................5
Electric Igniter (900rx) ...................................................................6
®
BASO
Thermostat Valve Assembly...............................................................6
Burner................................................................................8
Pilot, Thermocouple Assembly ............................................................. 8
SERVICE PROCEDURES AND ADJUSTMENTS..................................................9
Calibration ............................................................................ 9
Pilot Adjustment .......................................................................10
Gas Pressure Measurement..............................................................10
Gas Pressure Regulator Adjustment .......................................................10
Burner Adjustment .....................................................................11
Thermocouple Test .....................................................................12
Safety Valve.....................................................................6
ELECTRICAL OPERATION.................................................................. 13
Electrical Diagram ..................................................................... 13
TROUBLESHOOTING......................................................................15
© VULCAN 2010
F25383 (510)
Page 2 of 16
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
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.
®
pilot safety
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 models must be
installed with an externally mounted regulator.
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.
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
shut-off 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:
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 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
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 (510)Page 3 of 16
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.
GENERAL
924RX SHOWN
1. Burner assembly
2. Electric igniter (RX only)
3. Thermostat
4. Orifice
5. Thermostat capillary tube
6. Pilot, igniter (RX only) and thermocouple
®
7. BASO
pilot safety valve
COMPONENT LOCATION
924RX SHOWN
1. Pilot electric ignition system control switch (RX
only)
2. Power cord (RX only)
3. Thermostat
4. Gas shut off valve (RX only)
®
5. BASO
pilot safety valve
8. Pilot adjustment valve
6. Pilot flame adjustment
F25383 (510)
Page 4 of 16
REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Front Panel
1. Turn all thermostats to off position, loosen set
screw securing thermostat knobs and pull off
knobs.
Back Panel
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.
2. Remove screws securing back panel to griddle.
3. Install in reverse order.
MOMENTARY POWER SWITCH
(900RX)
NOT IN OFF POSITION FOR VIEW
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 lineof-sight 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.
1. Remove FRONT PANEL.
2. Label and disconnect wires from power switch.
3. Squeeze switch retainers and slide switch out
through front of panel.
4. Install in reverse order.
F25383 (510)Page 5 of 16
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