INSTALLATION &
OPERATION MANUAL
FORM F-35423 Rev. D (12/23)
C24GA SERIES
GAS CONVECTION
STEAMERS
MODEL ML
C24GA6 ML-136056
ML-138085
C24GA10 ML-136057
ML-138086
For additional information on Vulcan or to locate an authorized parts
and service provider in your area, visit our website at www.vulcanequipment.com
VULCAN
DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC
WWW.VULCANEQUIPMENT.COM
3600 NORTH POINT BLVD.
BALTIMORE, MD 21222
— 2 —
C24GA SERIES GAS CONVECTION STEAMERS
IMPORTANT FOR YOUR SAFETY
THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO
INSTALL THIS EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD
START-UP AND ADJUSTMENTS OF THE EQUIPMENT COVERED BY
THIS MANUAL.
POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN
THE EVENT THE SMELL OF GAS IS DETECTED. THIS INFORMATION CAN BE
OBTAINED FROM THE LOCAL GAS SUPPLIER, IN THE EVENT OF A POWER
FILURE, DO NOT ATTEMPT TO OPERATE THIS DEVICE.
IMPORTANT
IN THE EVENT A GAS ODOR IS DETECTED, SHUT DOWN
UNITS AT MAIN SHUTOFF VALVE AND CONTACT THE
LOCAL GAS COMPANY OR GAS SUPPLIER FOR SERVICE.
FOR YOUR SAFETY
DO NOT STORE OR USE GASOLINE OR OTHER
FLAMMABLE VAPORS OR LIQUIDS IN THE VICINITY OF
THIS OR ANY OTHER APPLIANCE.
Improper installation, adjustment, adjustment,
alteration, service or maintenance can cause property
damage, injury or death. Read the installation, operating and
maintenance instructions thoroughly before installing or
servicing this equipment.
IN THE EVENT OF A POWER FAILURE, DO NOT
ATTEMPT TO OPERATE THIS DEVICE.
© VULCAN, 2020
— 3 —
C24GA SERIES GAS CONVECTION STEAMERS
CONTENTS
GENERAL ...........................................................................................................................................
4
UNPACKING..................................................................................................................................4
INSTALLATION ..............................................................................................................................4
INSTALLATION CODES AND STANDARDS ..............................................................................4
LOCATION - GAS STEAMERS .....................................................................................................5
LEVELING AND ANCHORING ......................................................................................................5
PLUMBING CONNECTIONS ........................................................................................................5
Water Requirements ................................................................................................................5
Water Treatment ......................................................................................................................5
Water Supply Connection ........................................................................................................5
Filter System ............................................................................................................................5
Drain Connection .....................................................................................................................6
GAS SUPPLY CONNECTIONS ........................................................................................................6
Gas Connection Data .............................................................................................................8
Testing the Gas Supply System ...............................................................................................9
FLUE GAS EXHAUST .......................................................................................................................9
ELECTRICAL CONNECTIONS ........................................................................................................9
STARTUP .........................................................................................................................................10
OPERATION ....................................................................................................................................11
LIGHTING AND SHUTDOWN INSTRUCTIONS ...........................................................................11
Lighting ..................................................................................................................................11
Shutdown ............................................................................................................................... 11
COMPARTMENT CONTROLS .......................................................................................................11
STARTUP PROCEDURE ................................................................................................................12
PREHEATING ..................................................................................................................................12
OPERATING ....................................................................................................................................12
STEAMING .......................................................................................................................................12
EXTENDED SHUTDOWN ...............................................................................................................12
STAINLESS STEEL EQUIPMENT CARE AND LEANING............................................................13
CLEANING .......................................................................................................................................14
Cooking Compartment Drain .................................................................................................14
Draining Generator ................................................................................................................14
Compartments .......................................................................................................................14
Door Gaskets .........................................................................................................................14
LEAVE COMPARTMENT DOOR OPEN ........................................................................................15
GUIDELINES FOR MAINTAINING STAINLESS STEEL SURFACES .........................................15
MAINTENANCE ...............................................................................................................................16
Water Treatment System .......................................................................................................16
Scale Related Maintenance ...................................................................................................16
Draining Generator ................................................................................................................16
Flue ........................................................................................................................................16
COOKING CHART ...........................................................................................................................17
TROUBLESHOOTING ....................................................................................................................20
SERVICE AND PARTS INFORMATION.........................................................................................21
— 4 —
C24GA SERIES GAS CONVECTION STEAMERS
INTRODUCTION
GENERAL
Vulcan convection steamers are produced
with quality workmanship and material. Proper
installation, usage and maintenance will result
in many years of satisfactory performance.
It is suggested that you thoroughly read this
entire manual and carefully follow all of the
instructions provided.
Model C24GA6 can accommodate three 21/2"
deep (64 mm) steam pans per compartment.
Model C24GA10 can accommodate ve 21/2"
deep (64 mm) steam pans per compartment.
The C24GA6 and C24GA10 gas-red convection
steamers are designed for cooking vegetables,
eggs and other foods, in commercial kitchens.
Each compartment has a 0 to 60 minute timer.
(The buzzer requires manual shuto.) The
steamers are equipped with a cabinet base for
oor installation.
C24GA6 C24GA10
Compartments 2 2
Total Number of
21/2" (64 mm)
Deep Pans
6 10
Gas Rating 125,000
BTU/hr.
125,000
BTU/hr.
UNPACKING
This steamer was inspected and tested before
leaving the factory. The transportation company
assumes full responsibility for safe delivery upon
acceptance of the shipment.
Immediately after unpacking, check for possible
shipping damage. If steamer damage is found,
save the packaging material and contact the
carrier within 5 days of delivery.
INSTALLATION
For Installation, see the Installation section in
the Service Manual.
Before installing, verify that the type of gas
(natural or propane) and the electrical supply
required agree with the specications on the data
plate located on the left edge of the tabletop.
If the supply and equipment requirements do
not agree, do not proceed with the installation.
Contact your dealer or Vulcan immediately.
INSTALLATION CODES
AND STANDARDS
The Vulcan steamer must be installed in
accordance with:
In the United States of America:
1. Local Codes and State Codes
2. National Fuel Gas Code, ANSI-Z223.1/
NFPA #54 (latest edition). 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.
3. NFPA Standard # 96 Vapor Removal from
Cooking Equipment, latest edition, available
from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
4. 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.
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.
— 5 —
C24GA SERIES GAS CONVECTION STEAMERS
LOCATION - GAS STEAMERS
The equipment area must be kept free and clear
of combustible substances.
The recommended clearance for proper
operation is 36" (914 mm) at the front. The
required clearance from combustible or
noncombustible construction is 0" at the sides
and back. The recommended clearance for
service access is 18" (457 mm) at the sides and
6" (152 mm) from the back.
Make sure there is an adequate supply of air in
the room to replace air taken out by the ventilating
system. If you have any questions, contact the
ventilation system installer.
An exhaust system should be located directly
above the steamer to exhaust steam, ue
exhaust and heat generated by the steamer.
Do not locate the steamer directly over a drain.
LEVELING AND ANCHORING
Position the steamer in its nal installed location.
Place a level on the horizontal area of the cabinet.
Adjust the feet to level the steamer in both the
left-to-right and front-to-rear directions.
Steamers should be elevated in the front
just enough, about 1/16" to 1/8" (2 to 3 mm), to
provide proper draining. Do this by rotating the
adjustable feet in the proper direction 1 to 11/2
turns after leveling. Check drainage in the
steamer compartments by pouring a small
amount of water in the compartment. All the
water should drain.
The feet have holes in the anges for anchor
bolts.
PLUMBING CONNECTIONS
Plumbing connections must
comply with applicable sanitary, safety
and plumbing codes.
Water Requirements
Proper water quality can improve the taste of the
food prepared in the steamer, reduce liming in
the steam generator and extend equipment life.
Local water conditions vary from one location
to another. Ask your municipal water supplier
for details about your local water supply prior
to installation. Presence of sediment, silica,
excess chlorides or other dissolved solids may
lead to a recommendation for alternate form(s)
of water treatment. Test the water with the test
strip included with the steamer. Other factors
aecting steam generation are iron content,
amount of chloridation and dissolved gases.
Water Treatment
A local water treatment specialist should be
consulted before installation of steam generating
equipment.
Supply Pressure 20 psig owing - 60
psig static
Hardness* less than 3 grains
Silica less than 13 ppm
Total Chlorine less than 0.5 ppm
PH range 7 - 8
Undissolved Solids less than 5 microns
*17.1 ppm - 1 grain of hardness
If the water supply fails to meet these standards,
it will be necessary to install a water conditioner
on the generator water feed. The use of strainers
or lters will not remove minerals from the water.
Water Supply Connection
Connect the treated cold water supply line to
the 3/4" (19 mm) (male hose thread) inlet.
Connect the untreated cold water supply line
to the 3/4" (19 mm) (male hose thread) inlet
marked UNTREATED WATER.
Note: Do not over tighten water connections.
Over tightening the hose connections
will damage the water valve. Turn hose
connection by hand till snug and then
tighten with pliers 2/3 of a turn. Check
for leaks.
— 6 —
C24GA SERIES GAS CONVECTION STEAMERS
Note: If water lines move during water ll
valve operation then a water hammer
arrestors must be added.
A water lter system is recommended for the
water supply line going to the treated water
inlet. Follow the recommendations for use and
installation instructions shipped with the water
lter. If a water lter is not installed, the steam
generator warranty may be limited.
A manual shuto valve must be provided in a
convenient location near the steamer.
Filter System
If you decide to not install a scale reducing
lter system design for steam equipment or
use another manufacturer's system other than
recommended by Vulcan, please use these
guidelines.
• If you are going to delime the unit with a
deliming agent recommended for a pressure
steam boiler and stainless steel generators
and you are on city or treated well water, you
still must have a carbon block lter installed
and maintained. Carbon block lters remove
the chlorine and chloramines disinfectants
from the water. Chlorine and chloramines will
erode the boiler or steam generator and will
result in a vessel failure which is not covered
under warranty.
• Water feed lines to the steamer must be
ushed before nal connection. Particles
in the water could build up in the water and
steam valves or clog tubing and components
that maintain the water level and pressure
in the boiler or steam generator. If the water
supply is not free of sediment or cloudy after
several minutes of ushing, a sediment lter
must be installed before use.
• If you have purchased water lter system
from Vulcan, please follow the At the time of
installation you must register your steamer
at www.vulcanequipment.com or use the
reply card supplied with your unit. You will
need to register your steamer at each lter
change to insure your standard and extended
warranty is maintained.
Drain Connection
The 1½" NPT threaded tting on the condenser
box must be extended a minimum of 12" (305
mm) - maximum of 72" (1829 mm) away from
steamer base, to an open air gap type drain. Do
not reduce the 1 ½" NPT drain piping throughout
its length. Provide a suitable oor sink with a
minimum depth of 12" (305 mm). The oor sink
is NOT to be directly under the steamer and
should be at a distance so that steam vapors
will not enter the steamer from underneath. The
drain should slope down away from the steamer
¼" for every foot of drain pipe length. The drain
pipe should be either iron or copper. DO NOT
use PVC pipe; PVC pipe may lose its rigidity or
glue may fail.
In order to avoid any back pressure in the
steamer, do not connect solidly to any drain
connection.
Temperatures in the generator can briey reach
as high as 212°F (l00°C). Local codes may
require that the temperature of drain water be
no greater than 140°F (60°C). At the end of
the day, when purging the generators, some
provision for lowering the water temperature
must be provided by the user or installer to meet
this code requirement.
GAS SUPPLY CONNECTIONS
All gas supply connections and any pipe joint
compound used must be resistant to the action of
propane gas. A ¾" NPT minimum inside diameter
gas supply line is required. If quick disconnect
devices are used, make sure it is sized properly
for data plate BTU/hr. rating. Refer to quick
connect supplier’s data sheet.
Codes require that a manual gas shuto valve
be installed in the gas line ahead of the steamer.
The gas line must be capable of delivering gas
to the generator without excessive pressure drop
at the minimum rate specied on the rating plate.
— 7 —
C24GA SERIES GAS CONVECTION STEAMERS
Gas Input: ¾" NPT
Natural: 7" _ 10.5" W.C.
Propane: 11" _ 13" W.C.
Inadequate gas supply could result in burner
noise and poor burner performance.
Refer to the instruction manual supplied with
the machine for INSTALLATION CODES
AND STANDARDS and GAS CONNECTION
information.
Refer to the Service Manual for a view of the
Blower assembly set up for combustion issues.
The proper sizing and installation of the gas
connection is important for the machine to
operate within its design specications. In
some installations, the gas supply may not be
sucient enough to allow all the gas equipment
to operate properly at peak loads; or when other
equipment with a high BTU/hr. input requirement
is operating. The connection to the machine
becomes even more important in this type of
location.
Flexible gas connectors with quick disconnect or
swivel ttings (when used) and gas connectors
beyond the length necessary will reduce the
BTU/hr. ow capacity to the machine.
Note: Do not use corrugated stainless steel
tubing for commercial gas equipment
supply connections.
Note: A straight gas connection is the ideal
condition for the rated BTU/hr. ow
capacity of the connector. If a straight
connection is not possible and a exible
gas connector is used, do not twist, kink
or excessively ex the connector beyond
a U shape. Flexing the gas connector as
described will restrict gas ow or may
damage the connector.
Changing a exible gas connector may raise
the BTU/hr. ow capacity enough to allow the
machine to operate within its design specications.
(i.e. Removing the quick disconnect tting,
installing a shorter gas connector or installing a
larger diameter gas connector.)
An alternative may be to move the equipment
to a dierent gas supply location in the kitchen.
(i.e. Closer to the main supply into the kitchen
or away from other equipment with high BTU/
hr. input requirements.)
INCORRECT INSTALLATION
CORRECT INSTALLATION
MACHINE WALL
MACHINE WALL
Figure 1
The generator is equipped with a factory preset
pressure regulator. Natural gas
pressure regulators are preset for 7.0" W.C.
(0.62 kPa). Propane gas pressure regulators
are preset for 11" W.C. (2.46 kPa). No
further adjustment should be required. Check
gas pressures with a manometer at time of
installation to verify that they agree with the
pressures specified.
— 8 —
C24GA SERIES GAS CONVECTION STEAMERS
Gas Connection Data
FLEXIBLE GAS CONNECTORS BTU/HR. FLOW CAPACITY1, 2
LENGTH3LENGTH4
End Fittings - (1) Quick Disconnect & (1)
readed
End Fittings - Both Threaded
ID 36" 48" 60" 72" 36" 48" 60" 72"
½" 77,000 68,000 60,000 55,000 120,000 106,000 33,000 86,000
¾" 218,000 180,000 158,000 139,000 256,000 225,000 198,000 175,000
1" 37,.000 334,000 294,000 279,000 512,000 451,000 397,000 350,000
1¼" 615,000 541,000 476,000 419,000 946,000 833,000 733,000 645,000
1. Flow rating BTU/hr. 0.64 SP. GR @ 0.5 inch W.C. pressure drop.
2.
BTU/hr. ow capacities are based on Dormont Mfg. Co. Supr-Safe gas line connectors and are provided
for reference. Additional quick disconnect ttings, swivels, or manual shut o valves will reduce the BTU/
hr. ow capacities listed in this table. If other exible gas connectors are used, check the manufacturer’s
specications for BTU/hr. ow capacities. Super-Safe is a registered trademark of the Dormont Manufacturing
Company.
3. The maximum length for a exible gas connector is 72" per National Fuel Code standards.
BLACK IRON PIPE BTU/HR. FLOW CAPACITY1, 2, 3
Natural
Gas Nominal Inside Diameter of Pipe
Pipe
Length ½" ¾" 1" 1¼" 1½" 2"
15' 76,000 172,000 345,000 750,000 1,220,000 2,480,000
30' 52,000 120,00 241,000 535,000 850,000 1,780,000
45' 43,000 99,000 199,000 435,000 700,000 1,475,000
60' 38,000 86,000 173,000 380,000 610,000 1,290,000
75' 77,000 155,000 345,000 545,000 1,120,000
90' 70,000 141,000 310,000 490,000 1,000,000
1. Flow rating BTU/hr. 0.64 SP. GR @ 0.3 inch W.C. pressure drop.
2.
BTU/hr. ow capacities are based on Schedule 40 pipe, include a tolerance for pressure losses in gas
piping systems are provided for reference.
3. Count each 90° elbow as 3' of gas pipe for the purpose of calculating total pipe length.
— 9 —
C24GA SERIES GAS CONVECTION STEAMERS
Prior to lighting, check all
joints in the gas supply line for leaks. Use
soap and water solution. Do not use an
open ame.
A. Check all joints prior to the gas valve
(solenoid) before lighting unit.
B. Check all joints beyond gas valve
(solenoid) after unit is lit.
After piping has been checked for leaks, all
piping receiving gas should be fully purged to
remove air.
Testing the Gas Supply System
When the gas supply pressure exceeds 1/2
psig (3.45 kPa), the steamer and its individual
manual gas shuto valve must be disconnected
from the gas supply piping system.
When the gas supply pressure is ½ psig (3.45
kPa) or less, the steamer should be isolated from
the gas supply system by closing its individual
manual gas shuto valve.
FLUE GAS EXHAUST
DO NOT obstruct the ow of ue gases from
the ue located on the rear of the steamer. It is
recommended that the ue gases be vented to
the outside of the building through a ventilation
system installed by qualied personnel.
Information on the construction and installation
of ventilating hoods may be obtained from Vapor
Removal from Cooking Equipment, NFPA-96
(latest edition) available from the National Fire
Protection Association, Batterymarch Park,
Quincy, MA 02269.
ELECTRICAL CONNECTIONS
Appliances equipped with a
exible electric supply cord are provided
with a three-prong grounding plug. It is
imperative that this plug be connected
into a properly grounded threeprong
receptacle. If the receptacle is not the
proper grounding type, contact an
electrician. Do not remove the grounding
prong from this plug.
Electrical and grounding
connections must comply with the
applicable portions of the national
electrical code and/or other local electrical
codes.
Refer to the data plate located on the left edge
of the tabletop and the electrical diagram located
behind the front panel on the base.
ELECTRICAL DATA
Volts 120
Hertz (Hz) 60
Phase 1
Machine Amps 3
Minimum Circuit
Ampacity, Maximum
Protective Device
AMPS
15
— 10 —
C24GA SERIES GAS CONVECTION STEAMERS
STARTUP
The steamer and its parts are
hot. Use care when operating, cleaning or
servicing the steamer.
The cooking compartment
contains live steam. Stay clear while
opening door.
Once the steamer is installed and all mechanical
connections have been made, thoroughly test
the steamer before operation.
1. Check that proper water, drain, electrical
and gas connections have been made.
2. Turn on manual gas valve.
3. Press power switch to the on position. After
approximately 20 minutes the ready light
should come on, indicating that generator
has reached operating pressure.
4. With the door closed the ready light comes
on. Set the timer to the 5-minute position.
Open the door and observe that no steam
is entering the compartment and the ready
and cooking lights are o.
5. Close the compartment door. The cooking
light should now be lit and steam should be
heard entering the compartment.
6. Check the drain line to be sure that water
from the cold water condenser is owing
through the drain line.
7. Open the compartment door and observe
that steam supply to the compartment stops,
and that the ready light and cooking light
turn o.
8. Close the compartment door and let the
cooking cycle nish. When the timer returns
to the 0 position, a buzzer will sound,
signaling the end of the cooking cycle and the
cooking light goes o. To silence the buzzer,
turn the dial timer to the OFF position.
9. Complete the above steps for each cooking
compartment.
10. To shutdown the steamer, press the power
switch to the o position and close the manual
gas shuto valve. Leave the compartment
doors slightly open to allow the inside to
dry out.
— 11 —
C24GA SERIES GAS CONVECTION STEAMERS
OPERATION
The steamer and its parts are
hot. Use care when operating, cleaning or
servicing the steamer.
The cooking compartment
contains live steam. Stay clear when
opening the door.
LIGHTING AND SHUTDOWN
INSTRUCTIONS
Lighting
1. Turn manual gas shuto valve to on position.
2. Press power switch on. Steam will generate
in 20 minutes.
3. Ready light will light when compartment is
ready for cooking.
4. Load food and set timer to proper cook time.
Door must be closed.
Shutdown
1. Press power switch o.
2. Wait 5 minutes before relighting the appliance
(if required).
3. Turn manual gas shuto valve to o position.
4. Do not unplug or turn o power supply for at
least 20 minutes after power switch is turned
o.
5. Leave compartment door sightly open.
COMPARTMENT CONTROLS
The upper section of the steamer consists of
two cooking compartments. Each compartment
functions independently with its own controls
(See Figure 2) and is a separate, sealed steam
chamber during the cooking operation.
The steamer and its parts
are hot. Use care when operating, cleaning
or servicing the steamer.
Compartment Controls and Indicators
ITEM FUNCTION
Ready Light
(Green)
Indicates the steamer is
ready for the cooking cycle
Cooking Light
(Red)
Indicates the steamer is in
the cooking phase
Timer Set the desired cooking
time. Timer range is 0-60
minutes or constant. Turn
to the OFF position to
silence buzzer.
Figure 2 Cabinet Controls
— 12 —
C24GA SERIES GAS CONVECTION STEAMERS
Refer to Steam Cooking with Vulcan Kettles and
Steamers for suggested cooking times. Also
refer to the Suggested Cooking Guideline in this
manual. Size, weight, pan loading and product
quality will aect cooking times and should be
adjusted to your own requirements.
STARTUP PROCEDURE
1. Open manual gas shuto valve and ensure
the steamer doors are closed.
2. Press power switch to the on position.
3. If Ready light fails to turn on in 20 minutes,
press power switch o and back on to reset
ignition system.
PREHEATING
Preheat the cooking cavity when the steamer
is rst used for the day or whenever the
compartment is cold. Keep the door closed
during the preheat cycle.
• When the green ready light comes on,
set the timer to 10 minutes to preheat the
compartment.
• The red cooking light is lit.
• When the buzzer sounds, turn the timer to
the OFF position. The steamer is ready to
cook.
OPERATING
1. With the compartment(s) preheated and the
green ready light on, place pans of food into
the cooking compartment(s) and shut the
door(s).
2. Turn the timer(s) to the desired cooking time.
• The cooking cycle will begin.
• The cooking cycle and time may be
interrupted at any time by opening the
door. Close the door to resume cooking.
3. The buzzer will sound when the cooking
cycle ends and steam has stopped entering
the cooking compartment(s).
• Turn the timer(s) to the OFF position to
silence the buzzer(s); remove the cooked
food.
• The red cooking light will go o and the
green ready light will come on to indicate
the steamer is ready for the next cooking
cycle.
STEAMING
Each steaming compartment has its own
controls.
With the READY light lit, the steamer is ready
for use.
• Open the compartment door.
• Place pans of food to be cooked into the
compartment and shut the door.
• Set the timer to the desired cooking time.
Steaming begins.
• The cooking cycle may be interrupted at
any time by opening the compartment door.
Resume cooking by closing the door.
• When the buzzer sounds, the timed steaming
cycle has nished. Steaming stops, the
cooking light goes o. To silence the buzzer,
turn the timer OFF.
EXTENDED SHUTDOWN
To shut down for an extended period:
1. Press power switch to OFF.
2. Turn manual gas shuto valve to o.
3. Clean the compartment(s).
4. After 20 minutes unplug steamer.
5. Leave the compartment door slightly open
when the steamer is not in use. When the
compartment is idle, never latch the door
and apply pressure to the door gasket.
Leaving the gasket under pressure can
cause permanent deformation and reduce
gasket life.
— 13 —
C24GA SERIES GAS CONVECTION STEAMERS
STAINLESS STEEL EQUIPMENT CARE AND LEANING
(Supplied courtesy of NAFEM. For more information, visit their web site at www.nafem.org)
Contrary to popular belief, stainless steels ARE suscep-
tible to rusting.
Corrosion on metals is everywhere. It is recognized quickly on
iron and steel as unsightly yellow/orange rust. Such metals
are called “active” because they actively corrode in a natural
environment when their atoms combine with oxygen to form rust.
Stainless steels are passive metals because they contain other
metals, like chromium, nickel and manganese that stabilize the
atoms. 400 series stainless steels are called ferritic, contain
chromium, and are magnetic; 300 series stainless steels are
called austenitic, contain chromium and nickel; and 200 series
stainless, also austenitic, contains manganese, nitrogen and
carbon. Austenitic types of stainless are not magnetic, and
generally provide greater resistance to corrosion than ferritic
types.
With 12-30 percent chromium, an invisible passive lm covers
the steel’s surface acting as a shield against corrosion. As long
as the lm is intact and not broken or contaminated, the metal is
passive and stain-less. If the passive lm of stainless steel has
been broken, equipment starts to corrode. At its end, it rusts.
Enemies of Stainless Steel
There are three basic things which can break down stainless
steel’s passivity layer and allow corrosion to occur.
1. Mechanical abrasion
2. Deposits and water
3. Chlorides
Mechanical abrasion means those things that will scratch a
steel surface. Steel pads, wire brushes and scrapers are prime
examples.
Water comes out of the faucet in varying degrees of hardness.
Depending on what part of the country you live in, you may
have hard or soft water. Hard water may leave spots, and when
heated leave deposits behind that if left to sit, will break down
the passive layer and rust stainless steel. Other deposits from
food preparation and service must be properly removed.
Chlorides are found nearly everywhere. They are in water, food
and table salt. One of the worst chloride perpetrators can come
from household and industrial cleaners.
So what does all this mean? Don’t Despair!
Here are a few steps that can help prevent stainless steel rust.
1. Use the proper tools.
When cleaning stainless steel products, use non-abrasive
tools. Soft cloths and plastic scouring pads will not harm
steel’s passive layer. Stainless steel pads also can be used
but the scrubbing motion must be in the direction of the
manufacturers’ polishing marks.
2. Clean with the polish lines.
Some stainless steel comes with visible polishing lines or
“grain.” When visible lines are present, always scrub in a
motion parallel to the lines. When the grain cannot be seen,
play it safe and use a soft cloth or plastic scouring pad.
3. Use alkaline, alkaline chlorinated or non-chloride
containing cleaners.
While many traditional cleaners are loaded with chlorides,
the industry is providing an ever-increasing choice of non-
chloride cleaners. If you are not sure of chloride content
in the cleaner used, contact your cleaner supplier. If your
present cleaner contains chlorides, ask your supplier if they
have an alternative. Avoid cleaners containing quaternary
salts; it also can attack stainless steel and cause pitting and
rusting.
4. Treat your water.
Though this is not always practical, softening hard water
can do much to reduce deposits. There are certain lters
that can be installed to remove distasteful and corrosive
elements. To insure proper water treatment, call a treatment
specialist.
5. Keep your food equipment clean.
Use alkaline, alkaline chlorinated or non-chloride cleaners
at recommended strength. Clean frequently to avoid build-
up of hard, stubborn stains. If you boil water in stainless
steel equipment, remember the single most likely cause
of damage is chlorides in the water. Heating cleaners that
contain chlorides have a similar eect.
6. Rinse, rinse, rinse.
If chlorinated cleaners are used, rinse and wipe equipment
and supplies dry immediately. The sooner you wipe o
standing water, especially when it contains cleaning agents,
the better. After wiping equipment down, allow it to air dry;
oxygen helps maintain the stainless steel’s passivity lm.
7. Never use hydrochloric acid (muriatic acid) on
stainless steel.
8. Regularly restore/passivate stainless steel.
Job Cleaning Agent Comments
Routine cleaning Soap, ammonia,
detergent, Medallion
Apply with soft
cloth or sponge.
Fingerprints
and smears
Arcal 20, Lac-O-
Nu Ecoshine
Provides
barrier lm
Stubborn stains
and discoloration
Cameo, Talc, Zud,
First Impression
Rub in direction
of polish lines.
Grease and fatty
acids, blood,
burnt-on foods
Easy-o, DeGrease
It Oven Aid
Excellent removal
on all nishes
Grease and Oil Any good
commercial
detergent
Apply with soft
cloth or sponge.
Restoration/
Passivation
Benet, Super
Sheen
Review
1. Stainless steels rust when passivity (lm-shield) breaks
down as a result of scrapes, scratches, deposits and
chlorides.
2. Stainless steel rust starts with pits and cracks.
3. Use the proper tools. Do not use steel pads, wire brushes
or scrapers to clean stainless steel.
4. Use non-chlorinated cleaners at recommended
concentrations. Use only chloride free cleaners.
5. Soften your water. Use lters and softeners whenever
possible.
6. Wipe o cleaning agent(s) and standing water as soon as
possible. Prolonged contact causes eventual problems.
To learn more about chloride-stress corrosion and how to
prevent it, contact the equipment manufacturer or cleaning
materials supplier.
Developed by Packer Engineering, Naperville, Ill., an
independent testing laboratory.
— 14 —
C24GA SERIES GAS CONVECTION STEAMERS
CLEANING
Disconnect the electrical
power to the machine and follow lockout/
tagout procedures before cleaning.
Cooking Compartment Drain
Keep compartment drains running freely. Inspect
compartment drains daily for blockage. Remove
any particles or debris from the perforated
strainer daily (or more often if needed).
After cooking greasy foods or seafood, close the
doors and operate each compartment for 25 to
30 minutes to ush any residual grease and oils
down the compartment drain. Make a solution
of warm water and non-chloride/chlorine/bleach
based detergent and pour 1/2 gallon (1.9 liters)
of it down each compartment drain. Rinse by
pouring 1/2 gallon (1.9 liters) of hot water down
each compartment drain.
Draining Generator
To prevent malfunction of controls and clogging,
it is essential to drain the generator every day.
This will ush out any accumulated minerals
from the feed water. It will also aid in preventing
internal scale buildup which would interfere
with proper generator operation. Failure to
drain the generator every day will void the
steamer warranty. The presence of minerals
in suspension is indicated by a murky or milky
condition in the rst portion of the water drained.
The water being drained is
hot and under pressure. Use care when
cleaning or servicing the generator.
After the generator has been in operation, turn
the unit o with the power switch located on
bottom cooking cavity to drain the generator.
The generator will drain for approximately 15
minutes, removing sediment, scale and lime
buildup in the generator.
Compartments
Wash the inside of the compartment with
a solution of warm water and non-chloride
detergent. Rinse with warm water.
Once a week, thoroughly clean the exposed
surfaces (sides, front, door and top) with a damp
cloth and polish with a clean cloth. To remove
discolorations, use a nonabrasive cleaner.
Door Gaskets
Clean the gasket sealing surface of the
compartment door daily to remove food acids for
maximum gasket life. Do not use any solvents or
sharp instruments. Wash with a cloth moistened
in a solution of mild detergent and warm water.
Rinse with a fresh cloth moistened with warm
water to remove all traces of detergent.
Wipe dry with a clean cloth. Never apply food
oils or petroleum lubricants directly to the door
gasket. Petroleum-based solvents and lubricants
will reduce gasket life.
— 15 —
C24GA SERIES GAS CONVECTION STEAMERS
LEAVE COMPARTMENT DOOR OPEN
Leave the compartment door slightly open when
the steamer is not in use. When the compartment
is idle, never latch the door and apply pressure
to the door gasket. Leaving the gasket under
pressure can cause permanent deformation
and reduce gasket life.
GUIDELINES FOR MAINTAINING
STAINLESS STEEL SURFACES
There are four things that will break down
stainless steel and allow corrosion to develop: 1)
abrasion, 2) deposits, 3) water and 4) chlorides.
Avoid rubbing with steel pads, wire brushes or
scrapers that can leave iron deposits on stainless
steel. Instead, use plastic scouring pads or soft
cloths. For stubborn stains, use products such as
Cameo™, talc or Zud First Impression™. Always
rub parallel to the polish lines or with the grain.
Hard water will leave deposits that promote rust
on stainless steel. Treated water from softeners
or certain lters can eliminate these mineral
deposits. Other deposits from food or lubrication
must be properly removed by cleaning. Use
mild detergent and non-chloride/chlorine/bleach
based cleaners. Rinse thoroughly and wipe dry.
Where appropriate, apply a polish recommended
for stainless steel (such as Benet™ or Super
Sheen™) for extra protection and luster.
— 16 —
C24GA SERIES GAS CONVECTION STEAMERS
MAINTENANCE
The steamer and its parts are
hot. Use care when operating, cleaning or
servicing the steamer.
Water Treatment System
A water treatment system is recommended for
steamers. Refer to your supplier’s manual for
normal maintenance procedures for proper
scale-free operation recommendations.
Scale Related Maintenance
Periodic maintenance is necessary to keep your
generator clean and ecient. Initially, after three
months of steamer usage, it is recommended
that you have your Vulcan authorized service
inspect the generator. Local water conditions
and steamer usage will determine the frequency
that this service must be repeated; however, a
minimum recommendation is once a year. This
maintenance is not covered by warranty.
Draining Generator
At least once daily, turn the unit o with the
power switch located on bottom cooking cavity,
to drain the generator
Note: DO NOT remove the electric supply or
the unit will not drain.
Door Gaskets
If the door gasket is leaking due to a nick or
cut, it must be replaced. Damage to the gasket
sealing surface will cause steam leakage.
Flue
Annually (at minimum), when the steamer is
cool, check the ue and clear any obstructions.
— 17 —
C24GA SERIES GAS CONVECTION STEAMERS
COOKING CHART
The following table lists suggested cooking times and weights. These times, which will vary depending
on initial product temperature, size, shape, etc., are approximate and should be adjusted to suit your
operation.
PRODUCTS TO BE COOKED IN SOLID PANS
PRODUCT TIME (Minutes) WEIGHT PER PAN
Eggs, Scrambled 12 8 doz.
Rice, Long Grain (Cover with 4 cups water/lb.) 25 2 lbs.
Pasta (Place perforated pan inside solid pan,
cover with cold water)
Spaghetti – Regular/Vermicelli
Macaroni - Shells/Elbows
Noodles - 1/2" Wide
Lasagna Noodles
12 to 15
15 to 18
12 to 15
15 to 18
4 lbs.
4 lbs.
4 lbs.
4 lbs.
Frozen Casseroles, Lasagna 35 Full Pan
Meat Loaf, 3-5 Lb. Each 40 15 lbs.
Beef
Ground Chuck
Sliced as Purchased
20 to 25
35 to 40
10 lbs.
10 lbs.
Shrimp, Frozen, 10 Shrimp per Lb. 5 4 lbs.
Beans
Baked
Refried
9
9
10 lb. Can
10 lb. Can
Canned Vegetables
Prunes, Dried
6
15
10 lb. Can
— 18 —
C24GA SERIES GAS CONVECTION STEAMERS
PRODUCTS TO BE COOKED IN PERFORATED PANS
PRODUCT TIME (Minutes) WEIGHT PER PAN
Clams
Frozen
Fresh
10 to 12
10 to 12
3 dozen
3 dozen
King Crab, Frozen
Claws
Legs
4
4 to 6
2-1/2 lbs.
2-1/2 lbs.
Lobster Tail, Frozen 6 10 lbs.
Lobster, Live, 10" - 12"
Salmon Fillets, Frozen, 8 Oz Ea
Scallops, Fresh
5
5
4
4 Per Pan
7-1/2 lbs.
3 lbs.
Scrod Fillets, Fresh 3.5 4 lbs.
Eggs
Hard Cooked
Soft Cooked
Soft Yoke for Caesar Salad
15
9 to 10
6 to 8
4 doz.
4 doz.
4 doz.
Chicken — Breasts, Legs, Thighs 20 15 lbs.
Turkey
Frozen Breasts (2)
Cut Lengthwise
90
95
6 to 7 lbs. Ea.
20 to 25 lbs. Ea.
Corned Beef 40 to 75 6 to 8
Hot Dogs and Wieners 3 80 to 100 Count
Asparagus Spears
Frozen
Fresh
10 to 12
5
3 Dozen
5 lbs.
Beans
Green 2" Cut, Frozen/Fresh
Lima, Frozen
Baby Lima, Frozen
6
8
5
5 lbs.
5 lbs.
5 lbs.
Broccoli
Spears, Frozen
Spears, Fresh
Flowerettes, Frozen
8
6
6
5 lbs.
5 lbs.
5 lbs.
Brussel Sprouts, Frozen 6 5 lbs.
Cabbage, Fresh, 1/6 Cut 8 5 lbs.
— 19 —
C24GA SERIES GAS CONVECTION STEAMERS
PRODUCTS TO BE COOKED IN PERFORATED PANS
PRODUCT TIME (Minutes) WEIGHT PER PAN
Carrots
Baby Whole, Frozen
Crinkle Cut, Frozen
Sliced, Fresh
8
7 to 8
11
7 lbs.
4 lbs.
9 lbs.
Cauliower, Flowerettes
Frozen
Fresh
6
7 to 8
4 lbs.
5 lbs.
Celery, 1" Diagonal Cut 7 5 lbs.
Corn
Yellow Whole Kernel, Frozen
Cobbettes, Frozen
Corn-On-Cob, Fresh
5
8
16 to 18
10 to 12
16 to 18
5 lbs.
27 Ears
80 Ears
18 Ears
54 Ears
Peas, Green 6 5 lbs.
Potatoes, Whole Russet 55 10 lbs.
Spinach
Chopped, Frozen
Defrosted
Fresh Cut
17
5
3
6 lbs.
6 lbs.
2 lbs.
Squash, Acorn Halves 25 10 Halves
Zucchini, Slices 8 10 lbs.
Frozen Mixed Vegetables 6 to 7 10 lbs.
Fruit, Blanch for Peeling
Grapefruit
Oranges
3
3
Pineapple, Whole for Cutting 4
COOKING HINTS
Where possible, spread food out evenly in pans. Do not allow food to protrude above pans, since this
will interfere with steam circulation between pans in the compartment.
Always preheat compartments for satisfactory results.
When time does not allow for defrosting of frozen vegetables, such as loose-pack peas, corn, diced
carrots, etc., they may be cooked at once provided just half of the suggested portions in the cooking
chart are used.
— 20 —
C24GA SERIES GAS CONVECTION STEAMERS
SYMPTOMS POSSIBLE CAUSES REMEDY
Unit not steaming Gas supply is o
Power cord is unplugged
Power switch is o
Water supply is o
Burner control goes into 100%
lockout
Turn on gas supply
Plug in power cord.
Press power switch on
Turn on water supply
Shut o the power, wait 5
minutes, then turn power back on
to restart ignition.
If symptom persists, contact your
Authorized Vulcan Servicer.
Door leaks Damaged door gasket
High Water Pressure
Check door gasket for damage.
Verify water pressure is between
20-60 psi.
Verify drain plumbing.
If symptom persists, contact your
Authorized Vulcan Servicer.
Plugged drain or screen Clear compartment cavity screen.
If symptom persists, contact your
Authorized Vulcan Servicer.
Water accumulates in
compartment
Drain clogged
Not leveled properly
Unclog drain.
Level per instructions in this
manual.
High water pressure drain
installation.
Water not being supplied to
generator
Water supply valve is o
Water pressure low
Water lter is plugged
Turn valve on.
Check water supply pressure.
Refer to water lter manual.
If symptom persists, contact your
Authorized Vulcan Servicer.
Steam is exiting from
under unit
Generator pressure is too high Contact your Authorized Vulcan
Servicer.
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