These symbols are intended to alert the user to the presence of important
operating and maintenance instructions in this manual.
IMPORTANT FOR YOUR SAFETY
THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL GAS
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.
WARNING!
IN THE EVENT OF A POWER FAILURE, DO NOT ATTEMPT TO OPERATE THIS DEVICE.
WARNING!
IN THE EVENT A GAS ODOR IS DETECTED, SHUT DOWN UNIT AT THE
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.
WARNING!
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE, OR MAINTENANCE
CAN CAUSE PROPERTY DAMAGE, INJURY, OR DEATH.
READ THE INSTALLATION, OPERATING, AND MAINTENANCE INSTRUCTIONS
THOROUGHLY BEFORE OPERATING THIS EQUIPMENT.
WARNING
TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE THE CONTROL
PANEL. THERE ARE NO USER-SERVICABLE PARTS INSIDE. REPAIRS SHOULD BE
MADE BY AUTHORIZED SERVICE PERSONNEL ONLY.
NOTICE
Using any part other than genuine Lang factory supplied parts relieves the manufacturer of all liability. Lang reserves
the right to change specifications and product design without notice. Such revisions do not entitle the buyer to
corresponding changes, improvements, additions, or replacements for previously purchased equipment.
Due to periodic changes in designs, methods, procedures, policies, and regulations, the specifications
contained in this document are subject to change without notice. While Lang Manufacturing exercises good
faith efforts to provide information that is accurate, we are not responsible for errors or omissions in information
provided or conclusions reached as a result of using the specifications. By using the information provided, the
user assumes all risks in connection with such use.
CALIFORNIA REGULATIONS .......................................................................................................63
SM-4
Lang A Division of S tar Mfg. Int'l Inc.
INTRODUCTION
Service Manual for Enviro-Star GCSF-ES
GENERAL
Lang Gas Convection Ovens are manufactured for
use with the type of gas indicated on the data plate
(natural gas or propane). Variations exist between
models. This manual details typical servicing
procedures that would apply to most, but not all, of
the listed models.
INSTALLATION
Refer to the Installation and Operation Manual.
OPERATION
Refer to the Installation and Operation Manual.
CLEANING
Refer to the Installation and Operation Manual.
TOOLS
•Standard set of hand tools
•Gas leak detection equipment
•Gas pressure manometer
WATER QUALITY REQUIREMENTS
-IMPORTANT-
LOCAL WATER CONDITIONS MAY DAMAGE
LANG EQUIPMENT. FAILURE TO PROPERLY
TREAT WATER MAY RESULT IN DAMAGE AND
MAY VOID SOME OR ALL OF THE WARRANTY.
WATER SPECIFICATIONS: After treatment, the water
must continuously be within the following parameters:
Cold Water
Minimum GPH3
PSI20 to 80
PH 6.8 to 7.6
Hardness2 to 4 grains/gallon
Total Dissolved Solids<100 PPM
Conductivity<1/500,000 Ohms/in.
Water line pressure and quality MUST meet the
Lang Manufacturing Specifications listed below.
Contact your local water equipment system provider
to assist you in determining your specific water
quality, or contact Lang Technical Support for
assistance, 1-800-807-9054.
A convection oven is an electro-mechanical, sealedtype of oven in which the combustion products are
separated from the air inside the oven. Heated air is
circulated by a fan into the oven and over the food
product, removing a thin layer of moisture from the
food and allowing heat to penetrate.
This method requires shorter cooking times at
lower temperatures and produces consistent results,
which may vary due to differences in preparation
rather than in oven operation.
Steam in the cooking process prevents the removal
of all the moisture during baking and produces a
better product. And when applied to bread dough
during the first five minutes, it allows yeast to work
longer producing better spring and volume and a
moist, flexible outer surface. Once the outside
layer of dough sets, gases in the loaf no longer
expand to increase loaf size.
Steaming bread dough as it bakes gelatinizes
starch on the outer layer and prevents the crust
from cracking. However, too much steam results in
an undesirable crust. During the last stages of
baking, a dry oven is needed to produce a crisp,
brown crust.
COMPONENT OPERATION
Electrical Power Circuit
The operating voltage (120 VAC) is routed from the
power source to a terminal block.
NOTICE: See the wiring diagrams in the
Troubleshooting section.
The AC line is connected through a 15 Amp fuse
(F7) to a contact on the motor relay (MR2), interior
light relay (LR1), and the primary winding of a stepdown transformer (T1).
The transformer provides 24 VAC through the circuit
board to control the oven electrical components.
Thermostat Operation
The thermostat maintains oven temperature at the
desired setting. A sensor (Figure 1) mounted inside
the oven monitors oven temperature. The unit is
equipped with both:
•a mechanical thermostat
•a programmable temperature controller.
Times and temperatures may vary due to factors
such as food quality and quantity, type of pan and
thermostat calibration. Differences in altitude will
also affect cooking times and temperatures.
Time & Temperature Conversion: To convert
standard oven recipes for use in a convection oven,
reduce cooking temperature by 25° F – 75° F and
the time by 25% – 35%.
Fan Speeds: The convection fan can be set for HI
or LOW speed. Most baking is done on HI, but
delicate products (i.e., Meringue pie) require a
LOW fan setting.
Oven Sensor
Figure 1: Oven Sensor
When the operator selects a temperature setting or
the product to bake, the oven is heated until the
temperature reaches the selected setting. The
controls circuit monitors the temperature sensor
and activates the ignition control module to ignite
the burner when heat is required.
SM-6
Lang A Division of S tar Mfg. Int'l Inc.
Figure 2: Gas Flow Diagram
Igniter &
Flame
Sensor
Burner
Gas Inlet
Line
Manual Gas
Valve
Burner Gas
Line
Solenoid
Valves
Main Gas
Valve
Intermediate
Gas Line
Service Manual for Enviro-Star GCSF-ES
Gas Flow and Ignition
Natural gas is supplied through the manual gas
valve (Figure 2) to the main gas solenoid. When the
temperature is selected the ignition control module
activates the igniter and opens the gas solenoid.
Gas flows to the burner and the igniter lights the
flame. The ignition control module monitors the
flame sensor to determine if the burner is on. If the
burner does not ignite, the solenoid valve closes
shutting off gas flow to the oven.
Ignition System
The igniter module controls ignition of the burner
gas. The module monitors burner ignition, heat and
shut down.
SPECIFICATIONS:
Fenwal 35-66 Series Igniter Module
INPUT POWER
Voltage
Current
OUTPUT POWER
Gas Valve2.0A max @ 24 V AC
OPERATING TEMPERA TURE -40°F to +175°F
FLAME SENSITIVITY0.7 micro amps
IGNITER24 VAC
Trail for Ignition7 Seconds
Inter-Purge15 Seconds
Control: 18 to 30
VAC 50/60 HzLine:
24 VAC
300 MA @ 24 V A C
with fan and gas
valve relay energized
(-40°C to +80°C)
(minimum)
Lang A Division of S tar Mfg. Int'l Inc.
Pre-Purge15 Seconds
Tries for Ignition3 Tries with 1 Hour
Automatic Reset
Post PurgeNone
OptionsNone
NOTE: Follow the wiring diagram and gas flow chart
to better understand the ignition description.
SM-7
Service Manual for Enviro-Star GCSF-ES
The oven ignition and control system operates on
120 and 24 VAC. When the power switch is placed
in the ON position, 120 VAC is routed through fuse
F7 (15A). The voltage from the fuse is routed to one
side (incoming) of a 24 VAC transformer (Figure 3).
The other side of the transformer (incoming) is
connected to a neutral input.
Ignition
Controller
Transformer
Figure 3: Transformer
The transformer converts the 120 VAC to 24 VAC
and routes the 24 VAC through the outgoing side
through a back-up switch, a back-up thermostat
switch and an over-temperature switch to the ignition
controller pin W.
The ignition control module (Figure 4) operates
on 24 VAC at pin W provided by the transformer.
The module controls the main gas solenoid and
the igniter.
Figure 4: Ignition Control Module
When the power switch is placed in the ON position
and a temperature is selected using the temperature
knob a call for heat is generated in the controller.
•The controller performs a self check routine.
•The diagnostic LED flashes for one second.
•A safety timing sequence begins.
•The controller performs a 15-second pre-purge of
the system.
•The controller must detect that the air switch is
working properly, before it energizes the igniter
and the surface of the igniter tip heats up.
•The main gas valve solenoids open allowing gas
to flow to the burner.
•The gas in the burner is ignited by the igniter tip.
A TFI (trail for ignition) period checks the flame sensor
for evidence of a flame at the burner. If flame does
not ignite within 7-seconds the control module closes
the main gas valve solenoids and gas stops flowing to
the burner.
SM-8
When a flame is detected, voltage to the igniter
stops and the igniter cools. The thermostat, pressure
switch and burner flame are monitored for proper
operation. When the selected temperature is reached
voltage stops flowing to the main gas valve solenoids
(Figure 5) and gas stops flowing to the burner.
Lang A Division of S tar Mfg. Int'l Inc.
Service Manual for Enviro-Star GCSF-ES
Figure 5: Igniter Controller Diagram
If flame is not detected during the TFI, the main gas
valve solenoids close and a 15-second inter-purge
delay starts. The control will attempt two additional
TFI periods before locking out. In lockout the main
gas valve solenoids will be locked out immediately.
The controller will reset after one hour if the
thermostat is still calling for heat. A new TFI
sequence will begin.
NOTE: If locking out occurs, a manual reset must
be performed by resetting the thermostat or
removing 24 VAC (turn off the power switch) for a
period of 5-seconds.
The following table lists the igniter terminals and
functions.
NOTE: See the Troubleshooting section for
instructions on performing a flame sensor current
check.
./4%
3EE THE
TROUBLESHOOTING
SECTION FOR
INSTRUCTIONS ON
PERFORMING A
FLAME SENSOR
CURRENT CHECK
Igniter Module Terminal Uses (Figure 5)
S1Igniter Output – 24 V AC
L124 VAC Input
L2Not Used
S2Flame Sensor Input
PSAir Proving Switch
WThermostat Input
MV1Main Gas Valve Solenoids Output
GNDGround Input
F1120 VAC Input
F2120 VAC Fan Drive Output
FCNot Used
R24V Hot to Transformer
Lang A Division of S tar Mfg. Int'l Inc.
Fan Operation
The fan switch has two settings: HI and LOW. The
fan is mounted inside the oven and must be ON
when the oven is in operation. The main burner
heats the oven through the burner box. The main
burner flames do not come into contact with the air
inside the oven. The fan circulates the air inside the
oven over the lower surface and maintains a constant,
even temperature. The motor control reverses the
direction of the fan periodically to provide consistent
baking operation.
SM-9
Service Manual for Enviro-Star GCSF-ES
Door Switch Operation
When the oven door is closed, the door switch
(Figure 7) grounds four motor relays: MR2, the
ignition control module, the gas solenoid, and the
igniter. When the door is open, the ground is
removed and the fan motor and gas to the burner
shuts off. When the door is open, the ignition
control module and igniter cannot operate.
Door Switch
Figure 6: Fan Motor Connections
The fan motor (Figure 6) operates on 120 VAC.
Three relays operate on 24 VAC control motor.
The relays function as follows:
•Motor relay 1 (MR1) ON/OFF controls fan rotation
by reversing the phase of the motor windings.
•Motor relay 2 (MR2) ON/OFF controls motor
operation by routing 120 VAC to the fan motor.
•Motor relay 3 (MR3) ON/OFF controls fan speed
by routing 120 VAC to the motor windings.
DOOR OPEN
Door Switch
DOOR CLOSED
Figure 7: Door Open/Closed
SM-10
Lang A Division of S tar Mfg. Int'l Inc.
Oven Lights
Service Manual for Enviro-Star GCSF-ES
Water (Steam) Applications
Light relay (LR1) routes voltage to one side of the
four oven lights (Figure 8). The other side of the
lights is connected to a neutral. When the
controller applies 24 VAC to the light relay, 120
VAC is routed to the oven lights, illuminating the
oven cooking area.
2YHQ/LJKWV
When steam is required for the baking process, the
controller activates the water solenoid (SV1)
(Figure 9). Water is passed through the water stall
(Figure 10) and heated to produce steam. The steam
fills the cooking area. The water system has a 3/8″
inlet line and a 3/8″ supply line to the water stall. The
water stall drain is 3/4″ allowing excess water to drain
quickly from the water stall.
6WHDPHU
$VVHPEO\
Figure 8: Oven Lights
Water
Outlet
Water
Solenoid
Water Inlet
Line
Water Stall
Figure 9: Water Flow Diagram
Lang A Division of S tar Mfg. Int'l Inc.
Line
Drain
Figure 10: Steamer Assembly (Water Stall)
Burnt Gas Exhaust
When natural gas is burned in the appliance, the
burnt gases must be vented away from the appliance.
The gases are exhausted out a vent and through a
flue (chimney or exhaust vent). There are numerous
exhaust/vent systems available to carry the exhaust
gases away from the appliance and work area.
WARNING
BURNING NATURAL GAS PRODUCES EXHAUST
GASES THAT CONTAIN CARBON MONOXIDE.
CARBON MONOXIDE IS A DEADLY GAS THAT
KILLS. ENSURE THAT APPLIANCE EXHAUST
VENTS, FLUES AND CHIMNEYS ARE
INSTALLED AND SERVICED BY PROFESSIONAL
INSTALLATION PERSONNEL AND ARE
ADEQUATE FOR THE APPLIANCE BEING
INSTALLED.
SM-11
Service Manual for Enviro-Star GCSF-ES
T
A negative pressure in the appliance allows the
exhaust gases to flow up the flue. The flue helps
generate air flow around the burner, allowing the
burner to burn the gas more efficiently. A draft
inducer (Figure 11) provides air to the burner and
helps exhaust the burnt gasses.
Draft Inducer Operation
The Draft Inducer is a device mounted on the top
of the oven over the exhaust vent. It provides
secondary air to the burners by creating a draft. The
operation of the Draft Inducer is controlled by the
Ignition Control.
Draft Inducer
O AIR PROVIN G
SWITCH
PS
54
W
37
55
34
MV1
GND
GAS
VALVE
37
55
34
Figure 12: Igniter Controller Internal Switch
During oven operation, combustion air flow is
monitored by the proving switch (pressure switch).
If the switch contacts remain closed for 30-seconds
during ignition sequence without an output signal to
the draft fan an airflow fault will be generated. If the
pressure switch (proving switch) contacts open
during a call for heat operation, the controller
(Figure 12) will begin a pre-purge period and a trail
for ignition sequence.
Figure 11: Draft Inducer
NOTE: See the wiring diagram for wire routing for
the draft inducer.
The draft inducer uses a proving switch to ensure
proper air flow when the burner is in operation. The
switch is mounted between the controller W terminal
and the PS terminal. An internal controller switch
(Figure 12) between the PS and MV1 terminals,
routes voltage to the main gas valve. If the internal
switch is open, the main gas valve solenoid will not
open to allow gas flow to the burner.
NOTE: In a description of the draft inducer, the
pressure switch is often referred to as a proving
switch. The terms mean the same thing and both
refer to the switch monitoring the draft inducer
air flow.
If the pressure switch (proving switch) contacts
remain open for 30-seconds after draft inducer fan
output (F1 and F2) begins, an airflow fault will be
signaled and the fan will remain ON. If the pressure
contacts open later during a call for heat, the
controller will begin a pre-purge period and the trail
for ignition sequence.
If the airflow signal (PS) is lost while the burner is
firing, the controller will immediately de-energize
the main gas valve solenoid and an airflow fault will
be displayed. The controller will continue to monitor
the proving switch (pressure switch) input waiting
for airflow to return. When airflow is detected, a trail
for ignition sequence will begin, followed by a prepurge period. If airflow does not return, the controller
will enter a lockout condition and the draft inducer
fan will shut OFF.
During normal sequence, if a flame signal occurs
due to the main gas valve solenoid not closing all
the way, the controller will energize the draft inducer
fan. If the gas valve solenoid closes, the controller
will shut off the draft inducer fan.
SM-12
Lang A Division of S tar Mfg. Int'l Inc.
CONTROLS
Service Manual for Enviro-Star GCSF-ES
The electronic control panel (Figure 13) is used to
control oven operation. The unit also has manual
backup controls.
Power
1-Shot
Steam
Fan
HI/LOW
Pulse Steam
COOK-N-HOLD
LED Temp
Indicator
Temp Knob
LED Timer
Screen
Timer Knob
Electronic Control Panel (Figure 13)
POWER:
•ON/OFF button
•When pressed ON, interior lights and panel
indicators turn on
•When pressed OFF, interior lights and panel
indicators turn off and the fan remains ON until
the oven cools down to 250° F
FAN:
•ON/OFF Switch
•Has two operating speeds: L=LOW & H=HI
•Must be turned on during operation
•During operation, the fan will reverse directions
periodically to maintain consistent condition
LED TEMPERATURE INDICATOR:
•Displays oven temperature
•ON indicates oven at set point
•Blinks with a call for heat or cooling to temperature
BACKUP
CONTROL
ACCESS DOOR
Figure 13: Electronic Control Panel
TEMPERATURE KNOB:
•Used to set oven temperature
•Dial to desired temperature
TIMER SCREEN:
•LED digital display
•Displays time remaining in cooking cycle
•Displays time selection for Steam Pulse
•Displays time selection for Steam 1- Shot time
TIMER KNOB:
•Sets cooking time
•Sets Steam Pulse time
•Sets Steam 1-Shot time
COOK/HOLD:
•Activated when cooking cycle stops and a
beeper will sound 5 times
•Beeper will sound 5 times
•COOK/HOLD light will turn OFF
•Oven temperature will drop to 150° F
•Temperature will remain at 150° F until operator
chooses a new cooking cycle or turns the oven
OFF
Lang A Division of S tar Mfg. Int'l Inc.
SM-13
Service Manual for Enviro-Star GCSF-ES
1-SHOT STEAM:
Initial Power ON Test
•Provides a 1 – 20 second single–shot of steam
to the cooking chamber
•Adjust by holding down the button while turning the
TIMER KNOB until the desired time is displayed on
the LED TIMER SCREEN (Figure 13)
PULSE STEAM:
•Sends a 1-second shot of steam to the cooking
chamber
•Adjust time from 1 – 120 seconds by holding
down the button and turning the TIMER KNOB
until the desired time is displayed on the LED
TIMER SCREEN
Using Backup Controls
The EnviroSTAR oven is designed with a set of
backup controls that can be used manually instead
of using the electronic oven controls. These controls
(Figure 14) are mounted behind a door below the
oven control panel (Figure 13). Controls include the
BACKUP/MANUAL switch, a TEMPERATURE knob
and a STEAM switch.
Follow these steps to verify the operation and
temperature control of the oven:
•Press the POWER button ON and verify that
the interior and panel lights turn on.
•Set the temperature to 300°F and verify that the
TEMP INDICATOR light is blinking.
•Verify that the oven reaches the set point and
signals Ready with an audible tone within 12
minutes (starting with a cold oven).
•Set the timer to 10 minutes and verify that the
fan stops and reverses direction after
approximately 108 seconds. (A full reversing
cycle takes 120 seconds.)
Door Switch
The BACKUP/MANUAL switch overrides the electronic
controls and activates the backup controls. The
TEMPERATURE knob controls the temperature. The
STEAM toggle switch controls the steam. In this
mode, the fan will operate at HI speed only.
The Backup mode does not use the energy-saving
option and does not allow the fan to operate at Low
speed or reverse direction.
To use the backup controls, place the BACKUP/
MANUAL switch in the BACKUP position.
Temperature Knob
TEMP
OFF
100
150
200
250
Backup / Electronic
Controls Switch
STEAM
450
400
350
300
Steam Switch
G
A
S
S
H
U
T
O
F
F
Figure 15: Door Switch Location
•Open the oven door (Figure 15) and verify that
the fan and TIMER stop then restart when the
door is closed.
•Turn both the TIMER KNOB and TEMP KNOB
to zero.
•Confirm that the fan stays on until the
temperature drops below 250°F.
SM-14
Figure 14: Backup Controls
Lang A Division of S tar Mfg. Int'l Inc.
Water/Steam Test
Power
Pulse Steam
COOK-N-HOLD
1-Shot
Steam
Fan
HI/LOW
LED Temp
Indicator
Temp Knob
LED Timer
Screen
Timer Knob
BACKUP
CONTROL
ACCESS DOOR
Service Manual for Enviro-Star GCSF-ES
Operating Sequence
Follow these steps to verify the water and steam
operation of the oven:
1. Identify the water purification system used.
2. Flush the water system to remove tainted
water from the system.
3. Put the oven into Backup mode and set the
temperature to 400°F.
6WHDPHU
$VVHPEO\
NOTE: Refer to the Lang™ GCSF-ES/GCSF-EZ
Installation and Operation Instructions for full
operational description, including optional features.
Figure 16: Water/Steam System (Water Stall)
4. Once up to temperature, use the STEAM
SWITCH on the control panel (Figure 17) to
flush water through the steam system (water
stall) (Figure 16) for one minute.
5. Check the water drain for proper operation.
Figure 17: Electronic Control Panel
Lang A Division of S tar Mfg. Int'l Inc.
SM-15
Service Manual for Enviro-Star GCSF-ES
The following table lists typical operating sequences
in order and results.
Operating Sequence
ACTIONRESUL T
Power button pressed ONPanel lights and interior
lights illuminate.
HI or LOW fan speed selectedHI or LOW fan speed light
illuminates.
TEMP KNOB used to selectOven begins heating and
125° F – 525° Ffan begins air circulation.
NOTE: The minimumNOTE: The fan will
temperature for steamreverse direction every
operation is 125° F.two minutes during the
cooking process.
STEAM PULSE button pressed STEAM PULSE light
while selecting a steam pulseilluminates, TIMER LED
time from 1 – 120 secondsmomentarily displays
pulse time and steam
pulse is applied.
Set temperature reachedBuzzer sounds eight
within 12 minutestimes.
Product loaded into ovenProduct begins to bake.
TIMER used to set cookingCook time displays on
timeLED and countdown
begins.
NOTE: If the steam pulse
is used, a one-second
shot of steam is applied
to the baking area.
used, the oven
temperature will drop to
150° F , the COOK/HOLD
light will turn OFF and the
oven will maintain at
150° F until the oven is
turned OFF or a new
cooking cycle is started.
Product removed from ovenOven is ready for
cooking.
SM-16
Lang A Division of S tar Mfg. Int'l Inc.
MAINTENANCE
Service Manual for Enviro-Star GCSF-ES
CAUTION
Always keep clear of combustible materials.
CAUTION
Keep the floor in front of equipment clean and
dry. If spills occur, clean immediately to avoid
the danger of slips or falls.
•Water filters and conditioners should be
inspected and replaced per manufacturer’s
recommendations.
OVEN CLEANING
Exterior
See STAINLESS STEEL CARE AND CLEANING.
Interior
WARNING
KEEP WATER AND SOLUTIONS OUT OF THE
CONTROLS AREA. NEVER SPRAY OR HOSE
THE CONTROL PANEL.
CAUTION
Most cleaners are harmful to the skin, eyes,
mucous membranes and clothing. Precautions
should be taken to wear rubber gloves, goggles
or a face shield and protective clothing.
CAUTION
Do not use caustic cleaners.
•Always start with a cold oven.
•Always follow the oven cleaner instructions.
•Do not use caustic cleaners. Using any harsh
chemicals will result in removal of the ETC
coating and etching of the porcelain.
•The oven interior should be cleaned using mild
soap and a non-metal scouring pad.
•Care should be taken to prevent caustic cleaning
compounds from coming in contact with the fan
wheel.
•Oven interior should be wiped down daily and
thoroughly cleaned weekly using warm water
and mild detergent. Do not use caustic cleaners.
•This appliance should be checked at six-month
intervals by a qualified technician (heating unit,
mechanical stability, corrosion, etc.), especially
control and safety devices.
•The oven racks and rack slides may be removed
and cleaned outside the oven using oven cleaner.
•The stainless exterior can easily be cleaned
using stainless steel cleaner.
•Always apply stainless steel cleaners when
the oven is cold and rub in the direction of the
metal’s grain.
CAUTION
Carefully read all warnings and follow the
directions on the label of the cleaner to be used.
CAUTION
Never leave a chlorine sanitizer in contact with
stainless steel surfaces longer than ten minutes.
Prolonged contact can cause corrosion.
Lang A Division of S tar Mfg. Int'l Inc.
SM-17
Service Manual for Enviro-Star GCSF-ES
STAINLESS STEEL CARE
Cleaning
Stainless steel contains 70-80% iron, which will
rust if not properly maintained. It also contains 1230% chromium, which forms an invisible passive,
protective film that shields against corrosion. If the
film remains intact, the stainless steel will remain
intact. However, if the film is damaged, the stainless
steel can break down and rust. To prevent stainless
steel breakdown, follow these steps:
CAUTION
Never use any metal tools. Scrapers, files, wire
brushes or scouring pads (except for stainless
steel scouring pads) will mar the surface!
CAUTION
Never use steel wool, which will leave behind
particles that rust!
CAUTION
Never use acid-based or chloride-containing
cleaning solutions, which will break down the
protective film!
Preserve the life of stainless steel with a regular
application of a high quality stainless steel polishing
cleaner as a final step to daily cleaning.
If signs of breakdown appear, restore the stainless
steel surface. First, thoroughly clean, rinse and dry
the surface. Then, on a daily basis, apply a highquality stainless steel polish according to
manufacturer’s instructions.
Heat Tint
Darkened areas, called heat tint, may appear on
stainless steel exposed to excessive heat, which
causes the protective film to thicken. It is unsightly
but is not a sign of permanent damage.
To remove heat tint, follow the routine cleaning
procedure. Stubborn heat tint will require heavyduty cleaning.
To reduce heat tint, limit the exposure of equipment
to excessive heat.
LOCKOUT/TAGOUT PROCEDURES
This section of the manual describes removal and
replacement of the various parts available from an
authorized service provider. For part numbers, refer
to the exploded view parts list in the Operations
Manual provided with the unit.
CAUTION
Never rub in a circular motion!
CAUTION
Never leave any food products or salt on the
surface. Many foods are acidic. Salt contains
chloride!
For routine cleaning, use warm water, mild soap or
detergent and a sponge or soft cloth.
For heavy-duty cleaning, use warm water, a
degreaser and a plastic, stainless steel or ScotchBrite pad.
Always rinse thoroughly. Always rub gently in the
direction of the steel grain.
Preserving & Restoring
Special stainless steel polishing cleaners can
preserve and restore the protective film.
Electrical Lockout/Tagout
The Lockout/Tagout procedure is used to protect
personnel working on an electrical appliance.
Perform the following steps when performing any
type of maintenance or service on an electrically
operated appliance.
1. In electrical box, place unit’s circuit breaker
into OFF position.
2. Place a lock or other device on electrical box
cover to prevent someone from placing circuit
breaker ON.
3. Place a tag on electrical box cover to indicate
that unit has been disconnected for service and
power should not be restored until tag is removed
by maintenance personnel.
4. Disconnect unit power cord from electrical
outlet.
5. Place a tag on cord to indicate that oven has
been disconnected for service and power should
not be restored until tag is removed by
maintenance personnel.
SM-18
Lang A Division of S tar Mfg. Int'l Inc.
Gas Lockout/Tagout
Service Manual for Enviro-Star GCSF-ES
Electronics Access
The Gas Lockout/Tagout procedure is used to
protect personnel working on a gas appliance.
Before performing any type of maintenance or
service on a gas appliance, follow these steps:
1. Locate the natural gas or inlet valve and place
the valve in the OFF position.
2. Place a tag on the valve indicating that service
is being performed on equipment and the natural
gas must remain off until service is complete by
the maintenance personnel.
3. Place a locking device on the natural gas inlet
valve preventing actuation until the lock is
removed by the maintenance personnel.
4. On the appliance, make sure all flame sources
are extinguished and/or removed by
maintenance personnel.
5. Bleed residual gas from the appliance inlet line
and allow time for the gas to dissipate before
beginning service on the appliance.
Gas Leak Test
WARNING
PERFORM THE ELECTRICAL
LOCKOUT/TAGOUT
PROCEDURE.
1. Perform the Electrical Lockout/Tagout
procedure, found on page 18 of this manual..
CAUTION
In the following steps, the upper and lower edges
of the electronics drawer slide in and out of the
mounting brackets. DO NOT pull the drawer
completely out from the oven, as it could slip out
and damage wiring and/or other components. If
further access to the drawer area is needed,
perform the External Right Side Panel Removal
procedure.
2. Open the oven doors approximately eight to ten
inches.
After completing service on any natural gas
appliance, all gas joints disturbed during service
must be check for leaks. DO NOT USE AN OPEN
FLAME. Use a hazardous gas tester or a soap and
water solution.
1. Apply a soap and water solution to gas joint and
check for bubbles.
2. If bubbles are present, the joint is leaking and
must be repaired before using the appliance.
Lang A Division of S tar Mfg. Int'l Inc.
Figure 18: Electronics Drawer
SM-19
Service Manual for Enviro-Star GCSF-ES
WARNING:
FO
R CONTINUED PROTECTION
AGAINST FIRE AND ELECTRIC SHOCK, REPLACE
WITH SAME TYPE AND RAT IN G OF FUSE.
600VAC
15A
60302-77
Fuse
3. Remove four screws located at the top and
bottom of the front panel.
7. Slide the electronics drawer closed, but do not
install mounting screws.
4. Carefully slide the electronics drawer
(Figure 18) out from the oven.
Main Power Fuse Replacement
WARNING
PERFORM THE ELECTRICAL
LOCKOUT/TAGOUT
PROCEDURE.
1. Perform the Electrical Lockout/Tagout
procedure, found on page 18 of this manual.
2. Perform the Electronics Access procedure.
3. Locate the fuse block (Figure 19) in the
electronics drawer (Figure 20).
8. Connect the oven to external power, and press
the front panel POWER button to ensure the
oven is operational.
9. When proper operation is determined, install
and tighten four mounting screws.
Fuses
Electronics
Drawer
Figure 19: Fuse Locator
4. Use an Ohmmeter to ensure the fuse is open
before replacing it. An ohm reading indicates
5. Using a fuse puller or similar tool remove the
the fuse has continuity and is good.
fuse.
6. Install an exact replacement fuse (Figure 21) in
the fuse holder. (Class G, Type SC-15, Time
Delay, rated for 600 VAC)
Figure 20: Electronics Drawer Access
Figure 21: Fuse Replacement
SM-20
Lang A Division of S tar Mfg. Int'l Inc.
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