Lang GCOD-AP User manual

IL1564
GAS FULL SIZE
COMPUTERIZED
CONVECTION OVEN
GCOD-AP
GCOF-AP
Installation and
Operation
Instructions
2M-W1347 Rev. B 10/13/14
GCOF-AP

2
These symbols are intended to alert the user to the presence of
important operating and maintenance instructions in the manual
accompanying the appliance.
FOR YOUR SAFTEY
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN
THE VICINTIY OF THIS OR ANY OTHER APPLIANCE.
POST IN PROMINENT LOCATION
INSTRUCTIONS TO BE FOLLOWED IN THE EVENT USER SMELLS GAS. THIS
INFORMATION SHALL BE OBTAINED BY CONSULTING YOUR LOCAL GAS SUPPLIER.
AS A MINIMUM, TURN OFF THE GAS AND CALL YOUR GAS COMPANY AND YOUR
AUTHORIZED SERVICE AGENT. EVACUATE ALL PERSONNEL FROM THE AREA.
WARNING
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE
CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH. READ THE INSTALLATION,
OPERATION & MAINTENANCE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR
SERVICING THIS EQUIPMENT.
WARNING
RISK OF FIRE OR ELECTRIC SHOCK
DO NOT OPEN
WARNING, TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE
CONTROL PANEL. NO USER-SERVICABLE PARTS INSIDE.
REPAIRS SHOULD BE DONE 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 specications 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 specications contained in this sheet are subject to change without notice. While
Lang 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 specications. By using the information provided, the user assumes all risks
in connection with such use.
MAINTENANCE AND REPAIRS
Contact your local dealer for service or required maintenance. Please record the model number, serial
number, voltage and purchase & Installation Information in the area below and have it ready when you
call to ensure a faster service.
SAFETY SYMBOL
Model No.:
Serial No.:
Voltage:
1-Phase or 3 Phase:
Purchased From:
Location:
Purchase Date:
Installed Date:

3
TABLE OF CONTENTS
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Equipment Description . . . . . . . . . . . . . . . . . . . . . . . . 5
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation
Leg Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Leg Pad Adapter Installation . . . . . . . . . . . . . . . . . . . 8
Stacking the Oven. . . . . . . . . . . . . . . . . . . . . . . . . 9
Flu Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ventilation & Clearence . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Connection . . . . . . . . . . . . . . . . . . . . . . .10
Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Gas Conversions . . . . . . . . . . . . . . . . . . . . . . . . .12
Initial Start-Up
Pre-Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
General Operation & Programming
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Typical Operation Sequence . . . . . . . . . . . . . . . . . . .14
Hints & Suggestions. . . . . . . . . . . . . . . . . . . . . . . . 15
Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Maintenance
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting
Symptoms / Possible Causes / Test . . . . . . . . . . . . . . . . 17
Wiring Diagram
120VAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Exploded View & Parts List . . . . . . . . . . . . . . . . . . . . . 20-25
PROBLEMS, QUESTIONS or CONCERNS
Before you proceed consult you authorized Lang service agent directory
or
Call the Lang Technical Service & Parts Department at 314-678-6315.
NOTICE ServiceonthisoranyotherLangappliancemustbeperformedbyqualied
personnel only. Consult your Lang Authorized Service Agent Directory.
You can call our toll free number 314-678-6315 or visit our website
WWW.LANGWORLD.COM for the service agent nearest you.

4
SPECIFICATIONS
Model Height x Width x Depth Clearance from Weight
(without optional stand) combustible surface Installed Shipping Freight Class
GCOF 38.1” x 40.2” x 38.8” Side:6”, Back: 6”, Floor: 6” 460 lbs. 500lbs 70
964mm x 1019mm x 985mm (209 kg) (227 kg)
GCOD 38.1” x 40.2” x 46.0” Side:6”, Back: 6”, Floor: 6” 540 lbs. 580lbs 70
964mm x 1019mm x 1168mm (245 kg) (264 kg)
Gas Vent Exhaust
15.2”
384mm
65”
1650mm
27”
684mm
Stand Optional
IL1565
SPECIFICATIONS
CURRENT MODEL PREVIOUS MODEL VOLTS AC Hz. AMPS FLA NAT. PROPANE BURNER INPUT
GCOD-AP-LP GCCO-AP-XD-P 115 60 7.1 5 X 60000
GCOD-AP-NAT GCCO-AP-XD-N 115 60 7.1 5 X 60000
GCOF-AP-LP GCCO-AP-P 115 60 7.1 5 X 55000
GCOF-APLP220 GCCO-AP-PE 220 60 3.6 5 X 55000
GCOF-AP-NAT GCCO-AP-N 115 60 7.1 5 X 55000
GCOF-APNATCP GCCO-AP-NCP 115 60 7.1 5 X 55000
GCOFSD-APNAT GCCO-APSD-N 115 60 7.1 5 X 55000
GCOFSD-APNCP GCCO-APSDNCP 115 60 7.1 5 X 55000

5
EQUIPMENT DESCRIPTION
Exterior Construction
The oven exterior dimensions are listed in the Specication Section. The Top, Front, Back, and Sides
are constructed of heavy duty 430 stainless steel, with an attractive No. 4 nish.
The ovens simultaneous-onening heavy duty doors come standard with double pane windows.
The door handle is constructed of Stainless Steel and Phonolic Tubing.
The oven cavity is insulated with high temperature insulation for efciency and reduced heat loss.
Interior Construction
The GCOF oven cavity dimensions are 29” (72.5 cm) Wide, 20” (50.84 cm) High, 21” (53.38 cm) Deep.
The GCOD oven cavity dimensions are 29” (72.5 cm) Wide, 20” (50.84 cm) High, 27” (53.38 cm) Deep.
The interior of the oven is constructed of porcelainized stainless steel.
Operation
The GCOD-AP and GCOF-AP ovens are forced air convection ovens with a vented oven cavity.
The air is driven by a 1/3 HP fan motor.
Controls
Easy to use manual control knobs.
Solid state temperature sensing and controls.
Pulse and two-speed fan.
Technical
The GCOD-AP and GCOF-AP ovens has electronic ignition and requires a 120V single-phase
connection.
Floor space required is 48” (122.6 cm) wide, 44” (112.5 cm) deep.
The oven weighs 500 lbs.
Contact the factory for correct orice sizes when installing oven above 4000 ft.
NOTICE The data plate is on the back side of the oven above the power cord.
The oven voltage, wattage, serial number, wire size, and clearance
specicationsareonthedataplate.Thisinformationshould
be carefully read and understood before proceeding with the
installation.
W
Door Handle Controls Steam Valve
Cover
Side Access
Panel
Blower
Wheel
H
DIL1567A

6
UNPACKING
Receiving the Oven
Upon receipt, check for freight damage, both visible and concealed.
Visible damage should be noted on the freight bill at the time of delivery and
signed by the carrier’s agent. Concealed loss or damage means it does not
become apparent until the merchandise has been unpacked. If concealed
loss or damage is discovered upon unpacking, make a written request for
inspection by the carrier’s agent within 15 days of delivery. All packing
material should be kept for inspection. Do not return damaged merchandise
to Star Manufacturing Company. File your claim with the carrier.
Location
Prior to un-crating, move the oven as near to its intended location as practical. The crating will help
protect the unit from the physical damage normally associated with moving it through hallways and
doorways.
Un-crating
The oven will arrive completely assembled inside a wood frame and strapped to a skid. Cut the
straps and remove the wood frame.
The oven can now be removed from the skid.
EACH UNIT WEIGHS 500 LBS. FOR SAFE HANDLING, INSTALLER SHOULD
OBTAIN HELP AS NEEDED, OR EMPLOY APPROPRIATE MATERIALS HAN-
DLING EQUIPMENT (SUCH AS A FORKLIFT, DOLLY, OR PALLET JACK)
TO REMOVE THE UNIT FROM THE SKID AND MOVE IT TO THE PLACE OF
INSTALLATION.
ANY STAND, COUNTER OR OTHER DEVICE ON WHICH OVEN WILL BE
LOCATED MUST BE DESIGNED TO SUPPORT THE WEIGHT OF THE OVEN.
SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT.
CAUTION

7
INSTALLATION
Leg Installation
Legs are available separately for both the
single and double deck installations. Single
deck installations require a 27-inch leg or
equipment cart. Double deck installations
require 6-inch legs or casters. All these are
available separately.
Place some cardboard on the ground and
with assistance carefully lay the unit on its
back. In stacked
The adjustable feet may be screwed in
or out as necessary to level the oven. A
torpedo level placed on an oven rack will
assist in leveling the oven.
Double-Stack Ovens
To install the 6-inch legs, adj. feet or casters
on the lower unit, follow the Leg Pad
instructions in the following section or in the
instructions included with the leg pads.
Single Oven
To install 27” legs or cart to your unit, place
the unit laying on its back onto a piece of
cardborad. Be sure to read all instructions
& follow the instructions provided with the
kit.
27” Leg Installation
With unit in position, fasten the two legs to the front corner pads then to the oven’s front corners
using the four 5/16 inch bolts provided in the leg kit. See leg pad adapter illustration to dermine
differences between front & rear support assemblies.
Lift the oven onto its front legs and block the back up using one of the 27-inch legs set upside
down in the center rear of the oven body. Install the third 27-inch leg onto the oven body on the
control side rear. Gently lift the oven rear, remove the temporary support leg & install it on the last
rear corner.
Rear
Support Assy
Front
Support Assy
Swivel
Caster
Caster Cardboard
IL1524A
Above: typical leg and caster installation.
Below: accessory options, legs, casters & equipment carts sold
separately. Follow installation instructions with the each specic kit.
Stacked Units
Caster Sets
27” Leg Set
(marine also)
27” Equipment Cart
6” Adj. Leg Sets
6” Adj. Bolt Down Leg Sets
(marine only)
Accessory Options
Single Units
IL1525

8
INSTALLATION cont.
Leg Pad Adapter
Identify the front and rear leg adapters (the
front adapters have two threaded inserts, the
rear has four). The leg adapters are included
with each specic accessory kit.
Leg to Adapter Installation:
Install the leg’s threaded stud through the hole
in the adapter labeled “C” with the bent ange
of the adapter facing away from the leg.
Screw the 3/4-inch nut supplied in the adapter
kit onto the leg stud and tighten. Secure to
oven using hardware provided.
Caster to Adapter Installation:
Place the swivel caster against the front leg
pad adapter with the ange of the adapter
facing away from the caster.
Install the four 5/16 inch bolts through the
caster base and the adapter holes labeled “A”
then install the 5/16 inch nuts with washer and
lock washers.
Place the rigid casters against the rear leg
adapter with the ange of the adapter facing
away from the caster.
Align the caster to the holes in the adapter labeled “B”. NOTE: There are two sets of “B” holes set
at 90° from the each other. One set will create a left rear adapter and the other set will create a right
rear adapter.
Install four 5/16-inch bolts through the caster base and the adapter holes labeled “B” then install
5/16-inch nuts with lock washers and at washers.
Adapter to Oven Installation:
Gently tip the oven onto its back. Place the front leg adapter into the front corers of the oven. The
holes without the threaded inserts face the front of the oven and the ange on the adapter points
toward the bottom of the oven.
The edge of the leg adapter with the threaded insert slips under the ange on the oven side, while
the edge without the inserts sits on top of the threaded angle on the oven front.
Install two 3/8-inch bolts with lock washers and at washers through the front holes “D” in the leg
adapter and into the threaded inserts on the oven.
Thread one 3/8-inch bolt with lock washer and at washer into the rear threaded hole labeled “E” on
each of the leg adapters.
The forward threaded hole on the front leg adapter does not get a bolt installed.
Place the rear leg adapters into the rear corners of the oven so that the adapter is under the ange
of the oven side and back.
NOTE: If installing a caster place the adapter on the oven so that the casters roll forward.
Install for 3/8-inch bolts with lock washers and at washers through the holes labeled “E” in the
ange of the oven and into the threaded inserts of the leg adapter.
D
E
E
E
E E E E
E
E
E
A A
A
B
B
B
B
A
C
D D D
C
CC
OVEN BOTTOM
OVEN FRONT
IL1523
Above: Bottom on unit showing the placement of the leg adapters
and their hole assignment.

9
INSTALLATION cont.
Stacking the Ovens
Remove all the plug buttons from the top of the lower oven.
Remove the stacking kit from the oven compartment of one oven and install the 1 1/4-inch plastic
bushing into the top of the lower oven.
Tip the top oven backwards and install two 3/8-inch socket head bolts, found in the stacking kit,
into the two front leg holes that match the holes in the top of the lower oven. Install the socket
head bolts with the heads of the bolt pointing away from the oven.
Lift the top oven and gently set on top of the lower oven so that the heads of the socket head
bolts nest into the holes in the top of the lower oven.
NOTE: Each unit must have separate electrical connections
Flu Installation
A u extension must be installed on the upper oven of a stacked set.
The extension directs the heat of the lower unit away
from the motor of the upper unit. Without this installed,
the upper unit can experience problems including
premature motor failure.
This extension must be installed.
The ovens may now be set into position.
Be careful if sliding the ovens, they are
not designed to slide over cracks or
obstructions in the oor.
Button Plugs
Stacking Bolts
Upper Oven
Lower Oven
IL1566b
Flue Extension
Back Panel
(Top Unit)

10
INSTALLATION continued
Ventilation and Clearances
Standard minimum clearance from combustible construction is as follows.
4” from side
4” from back
6” from oor
• These ovens may be set directly, without legs, on a curbed base or non-combustible oor.
• If the oven is set without legs on a non-combustible oor or a curbed base, maintain a 4-inch back
clearance.
• If the oven is set directly against a non-combustible back wall, maintain a 4-inch clearance to the
oor.
• Do not install the oven closer than 4 inches from another oven on the right hand side
(control panel side).
• Do not install the oven closer than 12 inches from an uncontrolled heat source (char broiler etc.) on
the right side.
• Keep the area free & clear of combustible material, and do not obstruct the ow of combustion or
ventilation air.
• The installation of any components such as a vent hood, grease extractors, and/or re extinguisher
systems, must conform to the applicable nationally recognized installation standards.
THIS APPLIANCE IS EQUIPPED WITH A 3-PRONG (GROUNDING)
PLUG FOR YOUR PROTECTION AGAINST SHOCK HAZARD AND
MUST BE PLUGGED DIRECTLY INTO A PROPERLY GROUNDED
3-PRONG FROM THE PLUG.
Electrical Connection
The electrical connection must be made in accordance with local codes or in the absence of local codes
with NFPA No. 70, latest edition (in Canada use: CAS STD. C22.1).
The electrical service entrance is provided by a cord and plug located at the oven back directly behind
the control compartment.
Each oven requires a 115-volt grounded supply and 7.1 amps.
Supply wire size must be large enough to carry the amperage load for the number of ovens being
installed. Wire size information can be found on the oven data plate.
NOTICE: THE INSTALLATION OF THIS UNIT MUST CONFORM TO
APPLICABLE NATIONAL, STATE, AND LOCALLY RECOGNIZED
INSTALLATION STANDARDS.
NOTICE: THE INSTALLATION OF ANY COMPONENTS SUCH AS A VENT
HOOD, GREASE EXTACTORS, FIRE EXTINGUISHER SYSTEMS,
MUST CONFORM TO THEIR APPLICABLE NATIONAL, STATE AND
LOCALLY RECOGNIZED INSTALLATION STANDARDS.
WARNING

11
WARNING
INSTALLATION continued
Gas Connection
This appliance is manufactured for use with the type of gas indicated on the data plate. Contact the
factory if the gas type does not match that which is on the data plate.
All gas connections must be in accordance with local codes and comply with the National Fuel Gas
Code ANSI Z223.1 latest edition.
An internal gas pressure regulator is located inside the control compartment.
Gas must be delivered to the appliance regulator at less than 1/2 pound of pressure and less than
1/2-inch water column pressure drop.
The internal regulator is preset at the factory, however, due to gas pressure variations from area
to area; it may be necessary to make minor adjustments to the regulator to provide the manifold
pressure indicated on the data plate. This should be 5 inches water column for natural gas and
10-inch water column for propane. A 1/8-inch NPT tap is provided on the main manifold for checking
regulator pressure. Access the main manifold by removing the bottom trim piece below the oven
doors.
When replacing the 1/8-inch plug in the main manifold a joint sealant that is resistant to the action of
liquid petroleum gas must be used.
The supply piping must be of sufcient size to provide 55,000 BTU/hr per oven. A 1/2-inch NPT
connection is provided at the rear of the oven directly behind the control compartment. Connect each
oven separately.
A gas shut off valve must be installed to the oven(s) and located in an accessible area.
This appliance and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 PSGI and the
appliance must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply system at test pressures equal to or less than
1/2 PSIG.
Test for gas leaks. Use a commercial leak detector or a soap and water solution.
CONVECTION OVENS INSTALLED WITH CASTERS MUST
HAVE THE FOLLOWING: A CONNECTOR THAT COMPLIES
WITH THE STANDARD FOR CONNECTORS FOR MOVABLE
GAS APPLIANCES ANSI Z21.69 LATEST EDITION, A QUICK
DISCONNECT THAT COMPLIES WITH THE STANDARD FOR
QUICK DISCONNECT DEVICES FOR USE WITH GAS FUEL, ANSI
Z21.141 LATEST EDITION, A TETHER OR OTHER MEANS TO
LIMIT APPLIANCE MOVEMENT WITH OUT RELIANCE ON THE
GAS SUPPLY PIPING. SECURELY ATTACH THE TETHER TO THE
EYEBOLT PROVIDED AT THE REAR OF THE APPLIANCE.

12
INSTALLATION continued
Gas Conversions
1. Disconnect oven from power and gas.
2. Remove bottom trim piece from oven (2 hex head bolts and 1 Phillips screw).
3. Remove side panel from oven.
4. Disconnect black manifold pipe from 3/8” aluminum pipe at the furrel nut.
5. Remove two Phillips screws holding black manifold pipe to oven.
6. Remove black manifold pipe from oven.
7. Remove both burner orices from manifold and replace with new orices,
making sure to apply pipe thread compound.
8. Remove two Phillips screws holding pilot assembly to oven.
9. Remove pilot assembly from oven.
10. Remove ¼” aluminum pipe from pilot assembly.
11. Remove pilot orice and replace with new pilot orice.
12. Re-attach ¼” aluminum pipe to pilot assembly.
13. Re-attach pilot assembly to oven.
14. Re-install black manifold assembly to oven, making sure that the orice goes into the
burner tubes.
15. Re-attach 3/8” aluminum pipe to black manifold assembly.
16. Remove the seal screw from the combination gas valve.
17. Remove the adjustment screw and spring from the combination valve.
18. Insert new spring into the valve and adjustment screw.
19. Re-connect oven to power and gas and check for leaks using a soap solution.
20. Adjust gas pressure to correct water column (5”NG, 10”LP).
21. Install new seal screw provided in kit and afx “Caution” sticker to the visible side of
the combination valve.
22. Re-install bottom trim piece and side panel.
NOTICE Kits designed to accommodate ovens from sea level to 5000 feet.
Contactfactoryfororicesizesoninstallationsabove5000feet.
NG to LP LP to NG
Part No. Description Qty. Part No. Description Qty.
2A-80401-05 Pilot Orice, Drilled .010 1 2A-80401-10 Pilot Orice, Drilled .018 1
Y9-80400-14 Main Burner Orice, Drilled #53 2 Y9-80400-13 Main Burner Orice, Drilled #43 2
2V-80505-11
Combination Gas Valve Spring,
Includes:
1 2V-80505-16
Combination Gas Valve Spring,
Includes:
1
1. Spring 1. Spring
2. Seal Screw 2. Seal Screw
3. Caution Sticker 3. Caution Sticker

13
INITIAL START UP
Pre-Power On
After the oven is installed and connected to power, prior to turning on, verify the following:
• The doors open and close freely.
• All racks are in the oven correctly.
• All packing materials have been removed from the inside of the oven.
• All power and gas connections are tight.
Power On
The pilot burner is electronically ignited. When the oven power switch is turned On the pilot will light.
There is a lockout safety feature on the spark ignition module. If, during the initial start-up, the pilot does
not light within 30 seconds the module will turn off all gas to the pilot burner. To reset the spark module,
turn Off the power switch for 10 seconds then turn the switch back On. This may need to be repeated
several times during the initial start-up until gas is present at the pilot burner.
NOTICE Duringtherstfewhoursofoperationyoumaynoticeasmall
amount of smoke coming off the oven, and a faint odor from the
smoke. This is normal for a new oven and will disappear after the
rstfewhoursofuse.
BEFORE LIGHTING USE A SOAP AND WATER SOLUTION TO TEST
ALL JOINTS FOR GAS LEAKS.
WARNING

14
General Operation & Programming
Convection ovens constantly circulate air over and around the product. This strips away the thin layer of moisture
and cool air from around the product allowing heat to penetrate more quickly.
Cooking times can be shortened and cooking temperatures can be reduced.
To convert standard deck oven recipes, reduce the temperatrue 50° degrees and the time by 25%.
Make minor adjustments as necessary.
Always weigh your product. This will give you a more consistent size, color and quality.
Check the product near the end of the initial cooking.
Do not open the oven door during baking, as this will change the baking characteristics of the oven and make it
difcult to determine a nal program.
If the product is overdone on the outside and underdone on the inside, reduce the baking temperature.
If the product is pulling away from the edge of the pan, the temperature is too high or the cooking time too long.
A convection oven is a mechanical piece of equipment. The
same control settings will always give the same results.
If the results vary, problems may be because of changes in
the product preparation.
GCOF-AP / GCOD-AP Control Panel
The Control panel consists of the following items.
Detailed operational descriptions are given later this
section.
Power: Turns the oven on and off
Pulse Fan:
Pulse Setting: Fan will only turn ON, when the oven is
calling for heat.
Fan Setting: Fan is on continuously, speed is determined
by the Hi/Low switch.
Hi/Low Speed Fan: Dual speed switch. Toggles the fan
between high & low speed.
Temperature Control: Allows temperature to be set in 25°F
increments from 140°F to 450°F
Timer: Electronic on-hour timer with
continuous beeper,
Typical Operation Sequence
Power
Light
Pulse Fan
Hi/Low
Speed Fan
Temperature
Control
Timer
IL1527A
Action Result
Turn Power Switch to ON Control panel heat call
light comes on.
Adjust temperature, between 140°F
& 450°F and allow 20 minutes for
preheating
Oven begins heating
Open oven door and insert product,
set timer up to 60 minutes. Timer begins counting down.
Timer beeps continuously when done. Product should now be done.

15
General Operation & Programming cont.
Hints & Suggestions
Convection ovens constantly circulate air over and around the product. This strips away the thin layer of
moisture and cool air from around the product allowing heat to penetrate more quickly.
Cooking times can be shortened and cooking temperatures can be reduced.
To convert standard deck oven recipes, reduce the temperature 50 degrees and the time by 25%. Make
minor adjustments as necessary.
The lower the oven temperature the more even the bake.
Always weigh your product. This will give you a more consistent size, color and quality.
Check the product near the end of the initial cooking cycle by turning on the oven light and looking
through the oven door windows.
Do not open the oven doors during baking as this will change the baking characteristics of the oven and
make it difcult to determine a nal program.
If the product is overdone on the outside and underdone on the inside, reduce the baking temperature.
If the product is pulling away from the edge of the pan, the temperature is too high or the cooking time
too long.
The convection is a mechanical piece of equipment. The same control settings will always give the
same results. If the results vary, problems may be because of product preparation.
Opening the vent will to allow mositure to escape the cooking chamber during part or all of the cooking
process. This will allow a more crispy product, example: french fries, sh, crispy crusts. Close the vent
for dough products like cinnamon rolls, breads. This is something to experiment with to determine what
is best for your specic menu.
Loading
Here are some things to remember when loading your oven.
• When loading and unloading the oven, stage products and racks so the oven door is opened for the
least amount of time.
• Be sure that racks are level within the oven.
• Bent or warped pans can greatly affect the evenness of the cook or bake.
• If using baker’s parchment, be sure the parchment does not blow over the product. That will create
an uneven bake.
• Load each shelf evenly. Spaces should be maintained equally between the pan and oven walls, front
and back.
• Do not overload pan’s this will create an uneven bake.
• For best baking results, load the oven from the center out during random loading.
ALWAYS KEEP THE AREA NEAR THE APPLIANCE FREE FROM
COMBUSTIBLE MATERIALS.
KEEP FLOOR IN FRONT OF EQUIPMENT CLEAN AND DRY. IF
SPILLS OCCUR, CLEAN IMMEDIATELY, TO AVOID THE DANGER OF
SLIPS OR FALLS.
CAUTION

16
MAINTENANCE
• Oven interiors should be wiped down daily and thoroughly cleaned weekly using warm water and mild
detergent. DO NOT use caustic cleaners.
• The appliance should be thoroughly checked at six-monthly intervals by a qualied technician
(heating unit, mechanical stability, corrosion...) with particular emphasis on all control and safety
devices.
CLEANING
• Always start with a cold oven.
• The stainless exterior can easily be cleaned using stainless steel cleaner.
• Always follow the cleaner manufacturer’s instructions when using any cleaner.
• Care should be taken to prevent caustic cleaning compounds from coming in contact with the fan wheel.
• The oven racks, rack slides, may be cleaned outside the oven cavity using oven cleaner.
• Using any harsh chemicals will result in the removal of the ETC coating and etching of the
porcelain below it. The oven interior should only be cleaned using a mild soap and a non metal scouring pad.
DO NOT use caustic cleaners.
• Always apply stainless steel cleaners when the oven is cold and rub in the direction of the metal’s grain.
KEEP WATER AND SOLUTIONS OUT OF CONTROLS. NEVER SPRAY OR
HOSE CONTROL CONSOLE, ELECTRICAL CONNECTIONS, ETC.
MOST CLEANERS ARE HARMFUL TO THE SKIN, EYES, MUCOUS
MEMBRANES AND CLOTHING. PRECAUTIONS SHOULD BE TAKEN TO
WEAR RUBBER GLOVES, GOGGLES OR FACE SHIELD AND PROTECTIVE
CLOTHING.
CAREFULLY READ THE WARNING AND FOLLOW THE DIRECTIONS ON THE
LABEL OF THE CLEANER TO BE USED.
NEVER LEAVE A CHLORINE SANITIZER IN CONTACT WITH STAINLESS
STEEL SURFACES LONGER THAN 10 MINUTES. LONGER CONTACT CAN
CAUSE
CORROSION.
WARNING
CAUTION

17
Troubleshooting
Symptoms & Possible Causes
The following are charts of Symptoms and Possible Causes to aid in diagnosing faults with your unit.
Refer to the symptoms column to locate the type of failure then to the Possible Cause for the items to be checked.
To test for a possible cause refer to test to identify test procedures. Test indicated with an “*” should be done by a
Lang factory authorized service representative.
NOTICE If an item on the list is followed by an asterisk (*), the work should be done by
a Lang factory authorized service representative.
USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY
LANG OR THEIR AUTHORIZED DISTRIBUTORS CAN CAUSE BODILY INJURY
TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT AND WILL VOID ALL
WARRANTIES.
NOTICE ServiceonthisoranyotherLangappliancemustbeperformedbyqualied
personnel only. Consult your Lang Authorized Service Agent Directory. You
can call our toll free number 314-678-6315 or visit our website
WWW.LANGWORLD.COM for the service agent nearest you.
BOTH HIGH AND LOW VOLTAGES ARE PRESENT INSIDE THIS APPLIANCE
WHEN THE UNIT IS PLUGGED/WIRED INTO A LIVE RECEPTACLE. BEFORE
REPLACING ANY PARTS, DISCONNECT THE UNIT FROM THE ELECTRIC
POWER SUPPLY.
CAUTION
WARNING
SYMPTOM POSSIBLE CAUSE
Power indicator is not lit. No power to cord outlet
Oven unplugged from outlet
Failed power cord or plug
Failed power switch
Failed indicator light
Failed pilot ignition
Oven will not heat Power Switch is not “ON”
Failed Pilot ignition
Failed 12-position switch
Failed Circuit Board
Failed Probe
Failed Contactor
Failed Centrifugal switch in Motor
Failed Motor
Failed Over-temperature Thermostat
Failed Valve
Product burning Product is cooked too long
Failed 12-position switch
Failed circuit board
Failed probe
Product under done Product is not cooking long enough
Failed 12-position switch
Failed circuit board
Failed probe
Possible Cause TEST
Product is cooked too long No test available, operational
condition
Failed Probe Check probe for proper
resistance*
Failed Circuit Board Conrm that board is getting
correct voltage*
Conrm that board is putting
out correct voltage*
Failed Valve Remove the wires and check
for continuity across the coil*
Failed Centrifugal switch in Motor Remove the wires and check
for continuity across them
while motor is turning*
Failed Motor contactor Remove the wires from the
contactor coil and check for
continuity across the contactor
coil connection*
Ensure the contactor
moveable points move freely
up and down*
Failed Motor Conrm that motor is getting
correct voltage*
Failed or disconnected safety
thermostat
Check across the thermostat
connectors for continuity*
Failed Spark Module Conrm that Spark Module is
getting proper voltage*

18
Model: GCCO-AP (S) 120V 2M-61111-115, Rev. B, 9/03/03
-AP
10
9 8 7 6 5 4 3 2 1
RTD
12
POSITION
SWITCH
NC C NO
PULSE
ON
2 - SPEED SWITCH
T7-T4
T9
P1
CONTROL
NO
NCC
DISC-STAT
HI-LIMIT
24
D
C
24VAC FROM MODULE
DOOR SWITCH
CONTROL
FROM
24
C D
G
TO HEAT
TO MOTOR
SWITCH TO DOOR
LIGHT PULSE 24 VAC
HEAT LIGHT
TIMER
BUZZER
1
2 3 4 5
LO HIGH
BLUE
BLACK
RED
12 POSITION TERMINAL BLOCK
= WIRE NUT
SWITCH POWER
FROM "HEAT"
C D
B
120
LIGHTS
B
G
SWITCH
LIGHR OVEN 120VAC
WHT BLK GRN
B
W
SUPPLY POWER
16/3 120V
CORD
PLUG NEMA 5-15
D C B
- AP
CONTROL
PV TH MV
GND GND
SENSE
HIGH VOLTAGE MODULE IGNITION
SENSE SPARK
C
L
S = SNUBBER 100V
M
COMBINATION VALVE
MV PV
GAS
S
L
PILOT
G
NOTE: MODEL GCCO-S USES A MECHANICAL TIMER
REVISION BLOCK
ECN NO.REV DESCRIPTION DR: DATEMFG ENG
B TOOK OUT ISOLATION XFMR DLG 09-03-03

33 37 3
6
25
24
38
28
31
30
29
27
26 23
21
SEE DETAIL A
SEE DETAIL B
SEE DETAIL C
SK2309 Rev. G 06/17/15
Model:
1
2
4
5
8
7
39
9
10
11
16
17
14
18
19
13
12
22
20
15
CERTAIN INSTANCES MAY NOT BE AVAILABLE
ILLUSTRATIVE PURPOSES ONLY AND IN
SOME ITEMS ARE INCLUDED FOR
35
36
34
GCOD/F-AP-NAT & GCOD/F-AP-LP
Gas Covection Oven

1 2U-71500-05 1 BLOWER WHEEL ECCO/GCCO ALL
2 Q9-60102-1404-1 1 GCCO MOTOR MOUNT ASSY (NO MOTOR) ALL
3 2T-30401-09 1 STAT FXD 500 DEG OPEN ALL
4 PS-30200-35 1 REPLACEMENT MOTOR ALL
5 Q9-GCCO-181 1 BODY BACK ALL
Q9-GCCO-429-1 1 BODY BACK - CORRECTIONAL GCOF-APNATCP, GCOFLAPNATCP,
GCOFSD-APNCP, GCOFSD-APNAT,
GCOFSD-APCP
6 Q9-GCCO-264-1 1 FLUE DEFLECTOR SPOT ALL
Q9-GCCO-264-2 1 FLUE DEFLECTOR SPOT C.P. GCOFLAPNATCP, GCOFSD-PNCP,
GCOF-APNATCP
7 LM-GCCO-154 1 CAN TOP ASSY GCOF-AP
Q9-60102-1403 1 GCCO TOP PANEL ASSY w/ MNT HRD GCOD-AP
8 LM-ECCO-152 1 CAN SIDE ASSY R/H GCOF-AP
8 Q9-60102-1402 1 GCCO RIGHT SIDE S/S EXTRA DEEP w/ MNT HRD GCOD-AP
9 2E-31107-02 1 CORD SET 14/3 X 8’ 15A ALL
10 Q9-60102-171 GCCO COOLING FAN KIT 120V
Q9-60102-1711 GCCO COOLING FAN KIT 220V
11 Q9-60102-904 1 ACCESS COVER - ECCO/GCCO, & HRDWR ALL
12 Q9-GCCOPAP 1 PANEL GCCO ACCU-PLUS
13 L9-50310-04 1 CONTROL DOOR COVER ASSY CORRECTIONAL PACKAGE
14 2P-70201-06 4 BRNZBRFLN 5/8ID X 3/4OD X 5/8 ALL
15 Q9-50312-02 2 DOOR CHAIN AND TURNBCKL ALL
16 2P-73000-03 1 SST SPRKT40B11 5/8 BORE ALL
17 2C-20201-15 10 WSHR FLT 960-C1016 PLTD ALL
18 Q9-ECCO-145-1 1 MICRO SWITCH BRACKET ALL
19 2E-30301-02 1 SWITCH, MICRO ALL
20 Q9-60102-115 BOTTOM PANEL WELD ASSY w/ LOGO ALL
Q9-GCCO-233-2 1 BOTTOM PANEL ASSY ALL
21 2M-60301-43 1 DIE CAST PLT LANG SATIN ALL
22 Q9-GCCO-257-W1 2 BURNER WELD ASSEMBLY ALL
23 LM-ECCO-155 1 LEFT CAN SIDE ASSEMBLY GCOF-AP
M9-60102-14021 1 GCCO LEFT SIE S/S EXTRA DEEP w/ MNT HRD GCOD-AP
24 2E-31602-04 2 LAMP SKT SNAP-IN WHT ALL
25 2S-31603-09 2 LAMPS INC 120V 40W ALL
26 2B-50200-20 5 RACK ECCO/GCCO OVEN GCOF-AP
2B-50200-31 5 RACK ECO DEEP OVEN ONLY GCOD-AP
27 2B-50200-93 2 RACK SLIDE 11 POS GCOF-AP
2B-50200-94 2 RACK SLDE 11 POS E&GCCO-T GCOD-AP
28 Q9-50312-44 1 LH DOOR ASSY E/GCCO ALL
Q9-50312-441 1 LH DOOR ASSY E/GCCO SOLID GCOFSD
29 Y9-50312-05 1 HANDLE ASSY 1 HANDLE ALL
30 Q9-50312-47 1 LH OUTER DOOR ALL
31 2Q-71301-04 1 WINDOW ASSY 9-5/8X16-5/8 ALL
33 Q9-50312-43 1 RH DOOR ASSY E/GCCO ALL
Q9-50312-431 1 RH DOOR ASSY E/GCCO SOLID GCOFSD
34 Q9-GCCO-161 1 SNORKEL ASSY ALL
35 Q9-GCCO-224-2 1 BAFFLE REAR ASSY ALL
36 2C-20112-02 4 SCREW SHLDR THUMB ALL
37 Q9-60102-99-2 2 BEARING BRACKET ASSY TOP ALL
38 Q9-60102-99 2 BEARING BRACKET ASSY BOTTOM ALL
39 Q9-60102-1403 1 GCCO FRONT TOP PANEL ASSY ALL
NI 2A-80400-01 2 ORIFICE SPUD UNDRILLED GCOD-AP-NAT
NI 2A-80400-01 4 ORIFICE SPUD UNDRILLED GCOD-AP-LP
NI 2E-41100-08 1 SENSOR ECCO/GCCO TEMP ALL
NI Q9-60101-633 1 GCCO NG TO LP CONVERSION GCOD-AP-LP
NI Y9-80400-14 2 ORIFICE SPUD .0595 #53 GCOD-AP-NAT
NI 2V-80505-10 1 COMBI VALVE ALL
Model No:GCOD-AP-NAT, GCOD-AP-LP, GCOF-AP-NAT, GCOF-AP-LP
GAS FULL SIZE CONVECTION OVEN
PARTS LIST October 13, 2014, Rev B
IMPORTANT: WHEN ORDERING, SPECIFY VOLTAGE OR TYPE GAS DESIRED PAGE 1
INCLUDE MODEL AND SERIAL NUMBER OF 1
Some items are included for illustrative purposes only and in certain instances may not be available.
Description
Part
Number
Key
Number
Qty
Per