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Service Manual for the Lang Models:

1. REVISION BLOCK REV ECN NO DESCRIPTION DR MFG ENG DATE B ADDED COOLONG FAN BET 58 12 98 STEAM Mi E NC o pem es A 6 o JP1 IGN JP2 HEAT 1 JP12 HI SP MOTOR Bd Ba Ba E JP13 LO SP MOTOR meae ane eme 5 4014 STEAM T JP15 OVEN LIGHTS 5 E 21 R IB cnn is T DOOR Sw Bye LIGHTS FAN T T o JP37 POWER ON OFF gt j 218 5 JP36 LIGHT SW 20 JP40 POWER SUPPLY 4 CHASSIS GROUND 8 a 0 ae CHASSIS GROUND 8m POWER RS232 CONNECTOR CONTROL sls g o o oc FRONT I s 2 C gt 5 amp DISPLAY E a 5 5 DOOR SWITCH 0 g 5 6 N 2 al n G d p 9 G 0 al TM RT 0 Zle y 2 BLACK 1 JP41 amp RID alg 2 lg ae ee gt c 1 OPTIONAL 2 2 ri STEAM CONTRO 1 4 16 3 120V La 2 O 0 RED POWER 2 ne SUPPLY
2. PILO POWER REV ECN NO DESCRIPTION om MFG enc DATE c ADDED COOLING FAN BT 6 25 98 C a gt OX X TO POWER BLK Sin 41 6 5 WHT 7 BLK 6 Se BLK COMPUTER E 2 2 E 8 BLK 9 WHT YEL 5 S Y 120 L 5 4 lt AAA Jee 0 SWITCH NALE ips 2 O 000000 30 YEI 9 59 5 SAW ee BACKUP a 24 1 Q00000 poor t COOLING 0 FAN N 17 GRN 9 N Licht NY IGNITION 20VAC 0 WHT MBPS 1 241 SNUBBER 100VAC MODULE 69 WHT 1 GRN STEAM NS A FAN HI 0 ER NORMAL SNUBBER 600VAC S INTERFACE 24 GRN RS MOTOR HIGH 22 RED BACK HEAT r J _ ORK 08 n LOW VOLTAGE SUPRESSOR FAN 4 DOOR SWITCH L y MOTOR HIGH L 4 C f f STEAM D ne amp 22 16 GRN 3 3 21 BRN LR f
3. STEAM ECCO GECOLIGHTS POWER e e e m 8 5 8 8 8 d 5 5 8 LJ LI YELLOW 14 15 YELLOW RED 2 1 4 5 YELLOW lt unl B j d Al s e go RELAY as iF 6 doc m q YELLOW d LL gt PURPLE PLUS q YELLOW lt POWER SWITCH q B YELLOW Ecco ecco YELLOW lt PURPLE PLUS TP POWER SWITCH n YELLOW n YELLOW DOOR SWITCH E d CPU CHIP BATTERY RIB 60 ON BLOCK 5 3 a4 REV ECN wo DATE O 6 POWER LIGHTS ee 1 BLACK 20 VAC 2 WHITE ines 7 LIGHT O SWITCH 35 TERMINAL BLOCK E 120V 0 HEAT LIGHT 6 y 26 wees TRANSFORMER 3 3 ay Wo Y YY zu 36 24v PULSE O_O PULSE LIGHT SWITCH O C CAPACITOR 31 BRN O O THERMOSTAT 19 GR LUG 2 ADJUSTABLE 9 616 17 WHT DOOR SWITCH on E SAFETY THERMOSTAT MOTOR SWITCH a BI METAL TYPE FIXED 19 1 18
4. scrolling through menu s Light switch Inspection light only this will allow you to back Push for light to come on Light will up to the previous menu automatically turn off In program mode this will Ng c he allow you to advance to t SU 7 next Big x iu 7 Power switch Cancel Up Down ight On Off Arrow down button Allows Arrow up button Allows you to scroll down you to scroll up PLATIM UM PROGRAMMING TER Control Panel Buttons 1 0 Product Buttons These are the buttons where the product programs are stored Pressing a Product Button will heat the oven to the programmed temperature A E Shelf Buttons The control is capable of timing each shelf individually Pressing a Product Button then a Shelf Button will start the countdown timer MAN PROG The MANUAL PROGRAM button allows the operator to enter a temporary product program without being required to input the programming code The temporary program is erased when the oven is turned off or when a new program is entered Time and temperature are the only parameters that can be entered in the Manual Program mode READ CLEAR The READ CLEAR button has several functions gt Itis always the first button pressed when entering programming codes Pressing it twice then pressing a Product Button will read back the program in that product button gt Pressing and holding the button down until appea
5. E 2 O 2 OPTIONAL SPARK BACK UP TSTAT STEAM CONTROL REV DESCRIPTION DR ENG DATE B ADDED COOLING FAN BT 5 17 98 IGN HEAT HI SP MO LO SP MOTOR OPT STEAM OVEN LIGHTS RTD DOOR SW POWER SUPPLY CHASSIS GROUND CHASSIS GROUND OPTIONAL STEAM SDLINDID fe gt WHITE BLACK GRN 16 3 180v POWER SUPPLY CORD v IGNITION zu MODULE MV SENSE 65 ORN GND 61 BRN i i COMBINATION VALVE Ce GAS 66 D WE PLATINUM QTY PART NUMBER DESCRIPTION MATERIA LANG MANUFACTURING M W D GCCO PT 120VAC NEXT HIGHER ASSY DRAWING NUMBER Lora 61111 146 B PARTS LIST GCCO DESCRIPTION PART NO Motor 1 3 HP 115 230 Volt with Momentary Switch Before A 90068 30200 15 Motor 1 3 HP 115 Volt 2 Speed After C 90069 30200 35 Micro Switch Oven Door 30301 02 Switch Toggle On On 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open 30401 09 Thermostat 450 F Oven 30
6. U W 0 0 0 0 0 0 29 0 0 0 0 0 TE 0 0 0 0 0 0 amp 0 0 0 0 0 0 214 RED 24 POLE TERMINAL BLOCK Y 7 gt gt WIRE CONN 36 BLUE GE SUPRESSO CREEN LOW VOLTAGE SUPRESSOR pays 34A BRN E E fog S SNUBBER 0 51A YEL X E S SNUBBER 600 gt _ 9 GRN 22B RED o SNUBBER 600V SPARK GRO HIGH og ILOT pp O VIL SENSE 4 O u H 2 O N S Y 00 QTY PART NUMBER DESCRIPTION 7 MATERIAL SENSE M PV 1 LANG MANUFACTURING COMBINATION VALVE a GAS DR SRC DATE TITLE WIRING DIAGRAM DATE TOLERANCES Eye OVEN NEXT HIGHER ASSY SHEET DRAWING NUMBER REV tort 6111392 B 61 NOTE MODEL GCCO S USES 6 A MECHANICAL TIMER 8 7 eas rion 0 SWITCH Moo NO 4 RTD PILOT REVISION BLOCK REV ECN NO DESCRIPTION DR MFG ENG DATE T es DOOR SWITCH power SWITCH HEAT A N LIGHT Z Qd e NL s 2 ISOLATION TRANSFORMER C Bee O O O O gt
7. Defective Motor VVV ON ON NON ON ON VV V NO HEAT NOTE The motor needs to be operational before the oven will start heating PROBABLE CAUSE CORRECTIVE ACTION Defective Probe gt Confirm that probe is operating properly See Technical Data Defective Circuit board gt Confirm that Heat Call light is on If no light is detected gt Check 12 position switch for normal operation See Technical Data If light is detected gt Check for 24V AC across heat output and D on 12 Pole terminal If voltage is not present Replace Circuit board If voltage is present Check over temperature thermostat for proper operation Check door switch for normal operation Defective Centrifugal Switch Confirm that when motor is running that there is continuity through Centrifugal switch Defective Hi Limit Thermostat Check Hi Limit Thermostat for continuity Defective Solenoid Valve Confirm that Valve is getting voltage Check Valve for normal operation Plugged Main Burner Orifice Clean orifice OUBLESHOOTING GCCO PROBABLE CAUSE CORRECTIVE ACTION Defective power switch Defective Transformer Gas supply turned off Defective Pilot Spark observed No spark observed Check power switch for normal operation Replace as necessary Check Transformer for normal operation Turn gas supply on and check for proper gas pressure 5 water column for natural gas and 10 water column for propane
8. Replace spark module if above checks do not correct problem If 24 VAC is not measured Turn oven off Check 120 24 VAC transformer for 18 9 on the primary coil and 1 Qon the secondary coil Turn unit back on and check primary coil for 120 VAC and secondary for 24 VAC Replace transformer Igniter continues to spark Check pilot for strong flame and good contact with sensor after pilot is lit Check sense wire for 12 to 13 micro amps on spark module Johnson Control spark modules use 4 terminal and Channel spark modules use Sense terminal Turn oven off and check sense wire for continuity Replace sense wire or spark module as necessary Defective back up relay Check relay for normal operation on GCCO ovens relay will be energized in computer mode Check coil for 24 VAC If 24 VAC is measured Turn oven off and gt Check coil for 80 O Replace if necessary If 24 VAC is not measured gt Verify that back up switch is in off position gt Check back up switch for normal operation gt Check any wires for short JBLESHOOTING GCCO C PROBABLE CAUSE CORRECTIVE ACTION Defective control transformer 12 VAC gt Check transformer for normal operation gt Check primary coil for 120 VAC and 154 1 Q Check secondary coil for no less than 10 5 VAC and 1 Q If voltage is measured on primary gt Check for voltage on secondary gt Replace transformer If voltage i
9. GCCO C GCCO PP GCCO PT GCCO SII GCCO T Convection Oven Start Up 1 Verify connections at plug and terminal block 2 Incoming Gas Water Column Natural Gas 3 Incoming Voltage 11 4 Motor amp draw 5 Are programs correct Yes L No 6 Verify actual temperature at 350 F F Note Install thermocouple wire in center of oven cavity Let oven cycle off and on 3 times before recording temperature Set manual program in the computer for 350 F Model Date Serial Store Tech Name Contact Company Store Phone Service Company Phone Address Pulse fan switch Pulse fan setting will only turn the fan on when the oven is calling for heat Temperature Control Allows temperature to be set from 100 F 450 F in 50 F TROL PANEL GCC Vent Knob gt ON Power switch OFF LIGHT Light switch Inspection light only Push toggle switch to the gg position to inspect product Switch will automatically return to the off position PULSE FAN HI SPEED A Dual speed switch Toggles the fan between 6 _ high and low speed FAN LOW SPEED TEMP TIME Timer Control Electronic hour timer with continuous beeper 11 Pulse fan switch Pulse fan setting will only turn the fan on when the oven is calling for heat
10. OGRAMMING GCCO PT ACTION DISPLAY Step 5 Select lt PROGRAM PRODUCTS PROGRAM PRODUCTS gt EDIT READY ZONE EDIT ACCESS CODE ENABLE MANUAL PRODUCT A CONFIGURE TIME OF DAY ACTION DISPLAY Step 6 Select lt CREATE NEW PRODUCT CREATE NEW PRODUCT EDIT PRODUCT gt DELETE PRODUCT gt EDIT PRODUCT ACTION DISPLAY Step 7 SELECT PRODUCT ICON is the first MR SELECT PRODUCT ICON gt Screen when creating a product program Press v until you find an icon that best resembles your product If necessary press USE Av KEYS TO SELECT to go backward through the icon list THEN PRESS ENTER TO ACCEPT Select ENTER to accept the icon and more to the next screen P gati APPETIZER A gt ENTER OGRAMMING GCCO PT CONT ACTION DISPLAY Step 8 SELECT PRODUCT NAME is where you spell the name using the A or v to select each letter Then select ENTER to move the cursor to the next space and select a new letter NOTE APPETIZER is the name that must be replaced with the new product name or blanks when SELECT PRODUCT NAME APPETIZER A USE Av KEYS TO SELECT P the product name is shorter than APPETIZER A 2774 APPETIZER A EXAMPLE APPLE replaces only APPET IZER A must be replace by blanks A blank can gt ACCEPT be found before A or after 9 when
11. Perform the following trial ignition and look and listen for spark Attempt to light the pilot burner If the burner does not ignite after 30 seconds cycle power and repeat trial ignition The pilot may require several trials for ignition to bleed air from the gas piping After the ignition attempt pilot should only require 2 5 seconds for normal start up gt Check for 24 VAC at pilot valve If 24 VAC is measured turn oven off gt Check for pilot burner orifice blockage Clean and repair as necessary gt Perform trial ignition as described in above section lt Replace gas valve If 24 VAC is not measured gt Check for 24 VAC at PV on spark module gt Check continuity on wire between PV on spark module and Pilot Valve Turn oven on Refer to wiring diagram and check for 24 VAC at the TH terminal on the spark module If 24 VAC is measured Turn oven off Check large orange wire from ignitor module to pilot burner for continuity and for insulation breaks Replace wire as necessary Check spark electrode and hood of pilot burner Check spark gap Clean and regap if necessary Check pilot burner for any evidence of moisture Dry pilot if necessary Replace spark module if above checks do not correct problem If 24 VAC is not measured Turn oven off Check 120 24 VAC trasformer for 18 9 on the primary coil and 1 Qon the secondary coil Turn unit back on and check primary coil for 120 VAC and second
12. Purple Computer GCCO C Purple Plus Computer GCCO PP Platinum Computer GCCO PT e GCCO T gt Easy to use manual control knobs Pulse and two speed fan e GCCO AP gt Easy to use manual control knobs gt Pulse and two speed fan gt Solid State temperature sensing and controls e GCCO C gt Complete Computerized Controls with a Manual Override system gt Programmable up to 10 products with four tiers for each program gt Independent Shelf Timers for each Shelf gt Load Control through use of Cooking Curves gt Shelf Compensation Timing for uniform baking Single speed fan e GCCO PP gt The Purple Plus offer the same great one touch system of the Purple coupled with the advanced backing capabilities of the new Platinum Bun PMENT DESCRIPTION e GCCO PT gt Icon driven touch panel allows for easy operation also includes a manual override system gt Day Part Memory capabilities allow operators to recall the last daily selections automatically gt Programmable up to 99 products advanced baking capabilities include a 12 59 59 timer with ten tiers gt Independent Shelf Timer for each Shelf gt Load Control through use of Cooking Curves gt Shelf Compensation Timing for uniform baking gt Dual speed fan Bo RECEIVING THE OVEN Upon receipt check for freight damage both visible and concealed Visible damage should be note
13. Service Manual for the Lang Models GCCO T GCCO AP GCCO SII GCCO C GCCO PP GCCO PT Lang Manufacturing Company 6500 Merrill Creek Parkway Everett WA 98203 Phone 1 800 224 5264 Fax 1 425 349 2733 www langworld com Copyright 2000 oc SNC 10 11 12 13 14 15 _TABLE OF CONTE CHAPTER PAGE TABLE OF GONTEN TSS LAOS E 2 READ PRS Tesda REE ASAD 3 EQUIPMENT DESCRIPTION sss 5 INSTALLATION 7 APO PIU ee 10 CONTROL PANEL 14 PROGRAMMING sss 17 PROGRAMMING 2 18 GENERAL OPERATION enne nnne rrr nnns 28 TYPICAL 30 SEQUENCE OF OPERATION thee 33 TROUBLESHOOTING A 1224 irati det aaa 37 b E 55 WIRING DIAGRAMS 1 roe ese A A E 67 IMPORTANT READ FIRST IMPORTANT CAUTION THE OVEN WEIGHS 500 LBS FOR SAFE HANDLING INSTALLER EE SHOULD OBTAIN HELP AS NEEDED OR EMPLOY APPROPRIATE MATERIALS HANDLING EQUIPMENT SUCH AS A FORKLIFT DOLLY OR PALLET JACK TO REMOVE THE UNIT FROM THE SKID AND MOVE IT TO THE PLACE OF INSTALLATION CAUTION ANY STAND COUNTER OR OTHER DEVICE ON WHICH THE OVEN WILL BE LOCATED MUST BE DESIGNED TO SUPPORT THE WEIGHT OF THE OVEN CAUTION SHIPPING STRAPS ARE UNDER TENSION AND CAN SNAP BACK WHEN CUT gt WARNING INSTALLATION OF THE UNIT MUST BE DONE BY PERSONNEL QUALIFIED TO WORK WI
14. three times to advance lt DELETE PRODUCT screen to the boot up screen lt EDIT PRODUCT ACTION DISPLAY Step 17 You may now preheat the oven for any products you have programmed Step 18 Select Run oven lt RUN OVEN lt TIME DATE PROGRAM TIME DATE TEMP STATUS 12 00 01 01 01 325 STANDBY 27 OPERATIONS Convection ovens constantly circulate air over the product This strips away the thin layer of moisture and cool air from the top of the product Heat penetrates more quickly Cooking times are shortened and cooking temperatures are usually reduced To convert standard deck oven recipes to convection oven recipes reduce the temperature 50 F and the time by 25 Make adjustments as necessary depending upon your results The lower the temperature the more even the bake Check the product halfway through the baking cycle Look through the door windows Opening the oven door is not recommended If products are brown on the outside and not done on the inside too high a temperature is being used Decrease the temperature 15 25 F If products are pulling to the edge of pans or spilling the oven is not leveled or the pans are warped Correct as necessary Load each shelf evenly Spaces should be maintained equally between the pan and walls Front and back This will allow an even distribution of airflow BAKING Most baking should be done with the vent closed Open the vent only with high moisture products to avoid seepa
15. Confirm that 120VAC is feeding primary coil Confirm that 24V AC 15 at secondary coil See Failed Ignition portion of this manual Check for 24VAC at MV on the spark modual to ground If no voltage is present gt Confirm that pilot is lit Replace as necessary If voltage is present gt Check thermostat for normal operation gt Confirm that thermostat has 24 If no voltage is present gt Check component transformer and wiring for normal operation If voltage is present gt Check thermostat for normal operation Replace as necessary lt Disconnect centrifugal switch and check of continuity while the motor is running If no continuity is present Replace motor If continutiy is present gt Check thermostat for normal operation gt Check wires gt Check for 24V AC across valve If no voltage is present gt Confirm that wires have continuity If voltage is present gt Replace valve NO HEAT COMPUTER MODE IMPORTANT NOTICE Before trying to trouble shoot No Heat in Computer Mode confirm that the oven heats in Manual Mode PROBABLE CAUSE CORRECTIVE ACTION Defective output on CPU gt Check for 24V AC at JP2 while oven is calling for heat board If no voltage is present Board is operating correctly If voltage is present gt Replace CPU ANOMALIES PROBABLE CAUSE CORRECTIVE ACTION Display will intermittently gt Check ribbon cable for good connections
16. EE CORD Jt 7 BACK UP MOTOR HIGH 9 B N TSTAT 1 OPTIONAL TTA STEAM SDLINDID 5 15 0 NEMA PLUG HI LIMIT ayia SC STA GQ 3 DISC STAT U IGNITION pd MODULE SPPRIS 65 HIGH od cc T TN BESPINS PILOT O VDL TAGE GND O GND QTY ITEM PART NUMBER DESCRIPTION MATERIAL Q 6 gt A Y ONES 1 SENSE 61 BRN TAGI m By LANG MANUFACTURING COMBINATION VALVE GAS W D GCCO PP FJD DATE 3 9 98 TOL ERANCES 120VAC NEXT HIGHER ASSY SHEET DRAWING NUMBER REV dora 61111 145 B 65 BACK UP SWITCH BACKUP RELAY REVISION BLOCK BACK UP SWITCH 0 12 24 120 PIB apis Pi 26 E Em Pea ed P4 JP3 JPl JP JPl8 36 037 P38 p39 IP 40 9 69 P30 P31 P32 p33 934 Es COOLING FAN DOOR SWITCH P6 1 7 Jes
17. blank out gt Check panel label buttons and confirm that none of the domes are collapsed If domes are collapsed gt Replace panel label Intermittently over heats or Check probe for proper resistance under cooks Check ribbon connection for good connection Check probe for good connection TECHNICAL DAT TRANSFORMER RESISTANCE TRANSFORMER Input Primary Secondary Output gt 120 24 Volt 120 Volt 18 9 Q 10 24 gt 120 12 Volt 120 Volt 154 10 10 12 Volt 24 24 Volt 24 Volt 2 70 3 40 24 Volt CONTACTOR RESISTANCE CONTACTOR Coil gt 3 Pole 24 Volt coil 60 gt 2 Pole 24 Volt coil P amp B PP amp PT motor 350 RELAY RESISTANCE RELAY Coil 24VAC 820 OVER TEMP THERMOSTAT OVER TEMP gt Wires Normally closed DOOR SWITCH gt Check switch between COM common and NO normally open contacts insure switch closes approximately 3 to 4 inches before door closes BLOWER FAN lt Blower fan will rotate clockwise and should have 5 8 gap between it and the back wall of the can AUTO BYPASS SWITCH The Auto Bypass and Energy switch are located below the controls behind a pull down access panel gt Auto Bypass switch Normally in OFF The ON position will interrupt power to the computer and allow use of the back up thermostat gt Energy switch Normally in HIGH for 11 kW heats LOW WILL PROVIDE 8 25 kW heat Not provided on Steam convection oven
18. gt Replace if defective If 240 VAC is not measured gt Check back up switch SPDT for normal operation Replace if defective Motor contactor not gt Check for 24 VAC at contactor or relay coil energized If 24 VAC is not measured Turn oven off and gt Check door switch for normal operation gt Check door switch for continuity gt Replace or adjust door switch If 24 VAC is measured Turn unit off and gt Check contactor coil for continuity gt Replace if defective No voltage across contactor gt Check 120 VAC across terminals of contactor points If 120 VAC is not measured gt Check connection to main contactor heat contactor If 208 240 VAC is measured gt Check across NO contacts Should have 120 VAC gt Replace if defective Defective motor gt Check for 120 VAC at motor If 120 VAC is measured Turn oven off gt Check motor winding s for continuity gt Replace if defective 120 VAC is not measured gt Check wiring between motor and contactor Note Motor should now be operating NO MOTOR COMPUTER MODE PROBABLE CAUSE CORRECTIVE ACTION No 24 VAC on Interface gt Check for 24 VAC at TP4 to common D board If 24 VAC is not measured gt Confirm that back up relay is energizing gt Replace if defective If 24 VAC is measured gt Check for 24 VAC at 5 gt Replace Interface board if defective NO HEAT MANUAL MODE NOTE Fan must be operating befor
19. lt ENTER scrolling ACTION DISPLAY Step 9 SELECT PRODUCT TEMPERATURE Press the A or v to select a number Then select ENTER to move the cursor to the next space and select a new number The screen will automatically advance after you enter the last number SELECT PRODUCT TEMPERATURE 100 USE Av KEYS TO SELECT EXAMPLE 320 Press A three times for a 3 then 5 APPLE select ENTER to advance the cursor Press two times for a 2 then select TIER 1 ENTER to advance the cursor Since 0 is already displayed just select ENTER to advance to the next screen gt ACCEPT gt ENTER ACTION DISPLAY Step 10 SELECT TIER COOK TIME Time is entered in hours minutes seconds The maximum is 12 59 59 Select ENTER to advance cursor to the place you want to enter a number EXAMPLE 45 minutes 00 seconds Select ENTER SELECT TIER COOK TIME 00 45 00 USE Av KEYS TO SELECT twice to advance from hours to minutes then press A four times for a 4 then APPLE select ENTER to advance the cursor Then press A five times for a 5 then TIER 1 select ENTER to advance the cursor TEMP 320F Since 0 is the next two numbers simply select ENTER again twice to advance the cursor gt ACCEPT lt ENTER 24 OGRAMMING GCCO PT CON ACTION DISPLAY Step 11 SELECT COOKING CURVE Press A or Y to select numbers select ENTER to mov
20. pen oven doors and insert product set timer up to Timer begins counting down 60 minutes Timer beeps continuously when done Product should now be done GCCO T TYPICAL OPERATION SEQUENCE ACTION RESULT Adjust proper temperature between 140 amp 450 Oven begins heating degrees and allow to preheat up to 20 minutes Open oven doors and insert product set timer up to Timer begins counting down 60 minutes Timer beeps continuously when done Product should now be done GCCO SII TYPICAL OPERATION SEQUENCE ACTION RESULT Turn power switch to ON Digital display reads Press Temp button and use arrows to adjust to Oven begins heating and displays PrE proper Temp between 150 amp 450 Beeper will sound for 3 seconds when preheated Display will read preheated temperature Open doors and insert product Press Time Button and use arrows to adjust to Digital display will start countdown desired time Press Start Stop Button Beeper sounds continuously Press Start Stop Button GCCO C TYPICAL OPERATION SEQUENCE ACTION RESULT Turn power switch to ON Control panel comes on display says 88888 and then EntEr motor starts Press a product button Display says PrEhE Preheat oven begins to heat to the programmed temperature Beeper sounds briefly Display says rERdY Open the oven doors and load the product Close the Beeper sounds brief
21. use Sense terminal Turn oven off and check sense wire for continuity Replace sense wire or spark module as necessary Defective Module Confirm that there is a pilot ignition Check for 24VAC at to ground Defective Isolation Transformer Confirm that transformer is getting voltage Check transformer for normal operation Defective Door switch Confirm that Door switch is getting voltage Check door switch for normal operation Defective Motor relay Confirm that motor relay is getting power Check motor relay for normal operation 24 VAC 39 Confirm that motor is getting power Check motor for normal operation HIGH P1 T7 T4 LOW P1 T9 Defective Motor VVV ON ON NON ON ON VV V NO HEAT NOTE The motor needs to be operational before the oven will start heating PROBABLE CAUSE CORRECTIVE ACTION Defective Thermostat gt Confirm that Thermostat is getting 24 VAC Measure between Thermostat terminal and D on the terminal block If voltage is not present gt Check Transformer for normal operation If voltage is present Check thermostat for continuity Replace as necessary Defective Centrifugal Switch Confirm that when motor is running that there is continuity through Centrifugal switch Defective Hi Limit Thermostat Check Hi Limit Thermostat for continuity Defective Solenoid Valve Confirm that Valve is getting voltage Check Valve for normal operation Plugged Main Burner Orifice Clean or
22. 67 PARTS LIST GCCO A DESCRIPTION PART NO Motor 1 3 HP 115 Volt 2 Speed 30200 35 Micro Switch Oven Door 30301 02 Switch Toggle On On 30303 06 Switch Toggle Spring Return 30303 16 Switch Temperature Control 12 Position 140 450 F 30304 16 Thermostat Safety 490 F Open 30401 09 Terminal Strip 3 Pole 30501 02 Contactor 2 Pole 24 VAC 30701 05 Timer Electric 1 Hour 24V 30800 05 Buzzer Electric Timer 24V 30802 04 Power Cord with Molded Plug 31107 02 Transformer 115 24 VAC 31400 07 Transformer Isolation 24V 31400 24 Pilot Light 28 VAC 31601 07 Lamp Socket 31602 04 Lamp 250 Volt 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Circuit Board Temperature Control 40101 19 Probe Pilot Flame Sensor 41100 07 Probe Temperature Sensor 41100 08 Turnbuckle Assembly 50312 02 Door Left Hand 51100 45 Door Right Hand 51100 46 Panel Label 60301 100 Knob Time Temperature Control 70701 28 Window Assembly 71301 04 Blower Wheel 71500 05 Burner U Tube Steel 80002 05 1 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spark Ignitor NG amp LP 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG 80505 10 Valve Combination Gas Conversion Kit NG to LP 80505 11 68 PARTS LIST GCCO SI DESCRIPTION PART NO M
23. G 70469 40102 10 Circuit Board Front Panel After G 70469 40102 20 Circuit Board Microprocessor After G 70469 40102 44 Circuit Board Upgrade Kit Before G 70469 60101 53 Probe Pilot Flame Sensor 41100 07 Probe Temperature Sensor 41100 08 Door Handle 11 1 2 Long Black T Style Double Handle Ovens 50800 12 Turnbuckle Assembly Single Handle Ovens 50312 02 Door Left Hand Single Handle Ovens 51100 45 Door Right Hand Single Handle Ovens 51100 46 Panel Label Purple 60301 42 Valve Manual Main Water Supply Steam Units 70400 02 Valve Manual Water Supply Steam Units 70402 08 Valve Solenoid 24 60V Water Supply Steam Units 70403 01 Regulator Water Supply Steam Units 70404 01 Handle Assembly Single Handle Oven 70603 15 Knob Thermostat 450 F Oven 70701 17 Window Assembly Oven Door 71301 04 Blower Wheel 71500 05 Blower Wheel Steam Units 51100 57 Orifice Water Steam 60 DRL Steam Units 80405 01 Burner U Tube Steel 80002 05 1 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spark Ignitor NG Before G 70469 80300 04 Module Spark Ignitor LP Before G 70469 80300 05 Module Spark Ingitor NG amp LP After G 70469 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG Before X 87440 60101 63 Valve Combination Gas Conversion Kit NG to LP Before X 8
24. Temperature Control Allows temperature to be set in 25 F _ increments from 140 F JNTROL PANEL Vent Knob ON Power switch OFF LIGHT Light switch Inspection light only Push toggle switch to the V up position to inspect product Switch will automatically return to the off position PULSE FAN HI SPEED Dual speed switch 44 Toggles the fan between i high and low speed FAN LOW SPEED TEMP TIME Timer Control Electronic one lt hr timer with continuous beeper 12 INTROL PANEL Vent Knob ON switch OFF Light switch Inspection light only LIGHT COOK N HOLD Push toggle switch to the Cook N Hold switch position to inspect product Switch gt 7 D Oven will automatically will automatically return to the off ne z drop to 140 F when oven position timer stops timing down PULSE FAN HI SPEED Pulse fan switch Pulse fan setting will only turn the fan Dual speed switch on when the oven is calling Toggles the fan between for heat high and low speed FAN LOW SPEED TEMP TIME LED Display H H H Adjustment Arrows Adjusts the LED display 4 2 for time and temp TEMP TIMER Temp Button Press START to set desired temp tart Stop Button Starts STOP qq BUZZER and stops the time
25. door located on the lower right side directly below front panel Turn back up toggle on off switch to on position Turn main power switch to on position Check oven for normal operation VV VV ON FAILED IGNITION PROBABLE CAUSE CORRECTIVE ACTION Defective Power Switch PP Confirm that toggle switch is getting correct voltage only Check power switch for normal operation Defective Power Switch Confirm that JP37 has 5VDC in the off position and nominal voltage output on circuit board in the on position JP37 If JP37 has a constant 5VDC check toggle switch for normal operation Defective Ignition output Check for 24VAC at JP1 to Common If no voltage is present gt CPU is operating properly If voltage is present Output has failed Defective component Confirm that 208 240VAC is feeding primary coil transformer Confirm that 24V AC is at secondary coil Defective Spark Module Check for 24V AC at TH If no voltage is present gt Check component transformer If voltage is present gt Check for pilot ignition Replace spark module Defective pilot valve gt Check for 24V AC at pilot valve If no voltage is present gt Check component transformer If voltage is Present lt Confirm valve is operational Defective flame sensor Check flame sensor for 12 to 13 micro amps gt Replace flame sensor Plugged orifice Clean orifice IMPORTANT NOTICE Power must be disconnected at source
26. if defective NO HEAT Computer Mode PROBABLE CAUSE CORRECTIVE ACTION gt Check for 24 VAC at TP4 to ground If 24 VAC is not measured gt Check back up switch for normal operation If 24 VAC is measured gt Check for 24 VAC at TP6 gt Replace Interface board if defective No 24 VAC on Interface board DISPLAY LOCKS UP PROBABLE CAUSE CORRECTIVE ACTION Help in display 88888 stuck in display Display has shelf A Check probe for proper resistance Check that probe connections are secure Push TEMP button on control board and check to see if temperature rapidly descends If temp does descend rapidly replace ribbon cable Check to see that contactors relays are not stuck in the closed position Replace contactor if defective Check for foreign objects keeping contactor closed Check for stuck button by pressing any button If computer beeps or chirps gt gt gt gt Check control panel transformer 12 VAC for proper operation Check 1 for at least 10 5 VAC Check TP2 for at least 4 99 VDC Check TP3 for at least 4 97 VDC If computer does not beep or chirp Check each button for movement Check that panel label has not been damaged in any way Replace button if defective Replace panel label Read Programming Codes JUBLESHOOTING GCCO PP To help troubleshoot the oven you should perform the following Manual Override test Open drop down
27. nearest you BOTH HIGH AND LOW VOLTAGES ARE PRESENT INSIDE THIS APPLIANCE WHEN THE UNIT IS PLUGGED WIRED INTO A LIVE T RECEPTACLE BEFORE REPLACING ANY PARTS DISCONNECT THE UNIT FROM THE ELECTRIC POWER SUPPLY CAUTION USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY LANG OR THEIR AUTHORIZED DISTRIBUTORS CAN CAUSE BODILY Y INJURY TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT AND WILL VOID ALL WARRANTIES JUIPMENT DESCRIPT Lang Model GCCO GAS FULL SIZE CONVENTION OVEN EXTERIOR e The oven exterior dimensions are 40 100 cm Wide 32 80 cm High 38 95 cm Deep The Top Front Back and Sides are constructed of stainless steel with an aluminized bottom e oven doors come standard with a double pane window The door handle is constructed of Stainless Steel and Phonolic Tubing The oven cavity is insulated with high temperature insulation for efficiency and reduced heat loss INTERIOR The oven cavity dimensions are 29 72 5 cm Wide 20 50 84 cm High 21 53 38 cm Deep e The oven is designed for five shelves and comes with five Chrome Plated Racks The interior of the oven is constructed of porcelainized stainless steel OPERATION e The GCCO oven is a forced air convection oven with a vented oven cavity e The air is driven by a 1 3 HP fan motor CONTROLS The GCCO is available either with the Lang Accu Temp GCCO T Accu Plus GCCO AP Selectronic GCCO SID
28. 24 PAVAC v O O O O FRUM C MODULE M 1 s LIGHTS SWITCH en 12 POSITION TO HEAT gt ome TERMINAL BLOC MOTOR HEAT FROM CONTROL 9 OVEN 72 EV LIGHR 180VAC o x A PE Ouse PULSI LIGT 24 BLK DOOR SWITCH 16 3 120V POWER TU DOOR SWITCH SUPPLY FROM oy CORD CONTROL BLUE 5 a Oo 1 2 gt 2 SPEED E SWITCH 5 15 2j NEMA PLUG WIRE NUT YN gt S SNUBBER 100V HI LIMIT DISC STAT Q N Q 2 Q O MV PV QTY ITEM PART NUMSER DESCRIPTION MATERIAL gt E COMBINATION VALVE 048 LANG MANUFACTURING SRC 12 14 94 14 94 FD DATI W D GCCO AP S TOLERANCES FRACTIONS DECIMALS 4 RW ECIFIED S ARE IN INCHES N A 120VAC DRAWING NUMBER REV BITTPeTUe A 62 REVISION BLOCK Se 5 4 REV ECN NO DESCRIPTION DR MFG ENG DATE CUNTRUI CRH S
29. 402 27 Terminal Strip 3 Pole 30501 02 Contactor 2 Pole 24 VAC Before A 90068 30701 04 Contactor 2 Pole 24 VAC After C 90069 30701 05 Timer Electric 1 Hour 24V After C 90069 30800 05 Timer Mechanical Long Ring Before A 90068 30801 01 Buzzer Electric Timer 24V After C 90069 30802 04 Power Cord with Molded Plug 31107 02 Transformer 115 24 VAC 31400 07 Pilot Light 28 VAC 31601 07 Lamp Socket 31602 04 Lamp 250 Volt 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Probe Pilot Flame Sensor 41100 07 Turnbuckle Assembly 50312 02 Door Left Hand 51100 45 Door Right Hand 51100 46 Panel Label Before A 90068 60301 91 Panel Label After C 90069 60301 101 Door Handle Assembly Single Handle Oven 70603 15 Knob Time Control Before A 90068 70701 27 Knob Time Temperature Control 70701 28 Window Assembly 71301 04 Blower Wheel 71500 05 Burner U Tube Steel 80002 05 1 Gas Manifold 80100 07 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spark Ignitor NG amp LP 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG Before A 87433 60101 63 Valve Combination Gas Conversion Kit NG to LP Before A 87433 80505 07 Valve Combination Gas 24 VAC NG After A 87433 80505 10 Valve Combination Gas Conversion Kit NG to LP After A 87433 80505 11
30. 7440 80505 07 Valve Combination Gas 24 VAC NG After X 87441 80505 10 Valve Combination Gas Conversion Kit NG to LP After X 87441 80505 11 70 PARTS LIST GCCO PF DESCRIPTION PART NO Motor 1 3 HP 115 Volt 2 Speed 30200 35 Switch Micro Convection Oven Door 30301 02 Switch Toggle On Off 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open 30401 09 Thermostat 450 F Oven 30402 27 Terminal Block 24 Position Quick Disconnect 30503 01 Relay 24 VAC 30600 04 Contactor 2 Pole 24 VAC 30701 02 Contactor 2 Pole 30 Amp 24 VAC 30701 05 Power Cord with Molded Plug 31107 02 Cable Ribbon Assembly 31110 13 Transformer 115 24 12 VAC 31400 27 Lamp Socket 31602 04 Lamp Incandescent 250 Volt Clear 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Circuit Board Display 40102 24 Circuit Board Microprocessor 40102 26 Probe Pilot Flame Sensor 41100 07 Probe Temperature Sensor 41100 08 Oven Rack 50200 32 Oven Rack Slide 50200 59 Turnbuckle Assembly 50312 02 Door Left Hand 51100 45 Door Right Hand 51100 46 Panel Label Purple Plus 60101 881 Valve Manual Main Water Supply Steam Units 70400 02 Valve Manual Water Supply Steam Units 70402 08 Valve Solenoid 24 60V Water Supply Steam Units 70403 01 Regulator Water Supply Steam Units 70404 01 Handle Assembly Single Handle Oven 70603 15 Knob Thermostat 450 F Oven 70701 17 Window Assembly Oven Door 71301 04 Blower Wheel 71500 05 Bl
31. C B LE 2 3 R C gt ROGRAMMING GCCOJ ACTION DISPLAY Turn the power switch on If the oven is already on press the Read Clear key until the following screen is displayed SELECT PRODUCT OR READ CLEAR TO PROGRAM Enter access code 1 6 2 7 3 8 A SET TIME B SET DATE PROGRAM PRODUCTS D NEXT MENU Select C PRODUCT PROGRAM MODE SELECT PRODUCT NUMBER 1 9 Select a number from 0 9 and press the key corresponding to that number EDIT PRODUCT 1 EDIT OR 2 DELETE NXX TX XXXF CX PXXX F XX If a product Key selected already has a program the screen will read ENTER COOKING TEMP 100 TO 450 NOX T1 XXXF Enter a desired cooking baking temperature The ENTER COOKING TIME screen will automatically advance to the next HR MIN SEC T1 XXXF CO Enter the cooking time and then press E to ENTER COOKING CURVE advance to the next screen 0 TO 100 NOX T1 XXXF CXX Enter the desired cooking curve Refer to sections 6 3 and 6 7 for more detail ENTER FAN SPEED 2 LOW NOX T1 XXXF CXX PXXX Select Fan speed 1 1700 rpm Low 1400 ENTER FAN PULSE RATE 1 TO 100 NOX T1 XXXF CXX Select Fan Pulse rate 0 to 100 O off unless calling for heat 100 on at all time NOTE Any number between 0 100 m
32. CO C PROGRAMMING CODES Below are codes which will allow you to configure the display or aid in the operation and troubleshooting of the oven The readout must display ENTER before the computer will accept any programming code If the readout displays any other word reset the computer by pressing and holding the R C button until display reads 88888 then release Display should now read ENTER The control allows for a 3 second delay between each button push if a delay of longer than 3 seconds has occurred the programming code must be re entered OGRAMMING GCCO C The instructions call for pressing exactly what is shown under PRESS CODE DESCRIPTION OPERATIONAL Recall time remaining on a shelf Cancel a shelf timer DISPLAY MODES Countdown timer display Shelf in use display Internal oven temperature display PROGRAMMING Enter programming mode Recall an existing product program Erase a product program Model identification Fan Setting HI or Both Program download Contact Factory MAINTENANCE Actual oven temperature Return to ENTER SHELF COMPENSATION Enter shelf compensation mode Set shelf compensations Return to ENTER PRESS Shelf R C R C Shelf R C 4 8 4 8 4 8 R C 0 9 0 9 0 9 R C 8 7 8 7 8 7 R C 1 6 2 7 3 8 R C R C P Product programmed R C 1 6 2 7 3 8 P 000 R C D C D C D C R C E D C B A 1 high 2 both RIC A B C D E P R C 3 4 5 6 7 8 R C RIC C B B
33. PRESS SHELF BUTTON X REMOVE PRODUCT shelf button s flash Press the flashing shelf button s Beeper stops Display shows READY SELECT PRODUCT TO START if no other shelves carry product or resume count down for shelves that still have product cooking Open oven door and remove the product which corresponds to flashing shelf button s PICAL OPERATION CON GCCO PT TYPICAL OPERATION SEQUENCE ACTION RESULT Press the on switch Control panel comes on display says LANG Run Oven Time Date Program Select Run Oven Display will show a list of product to choose Select Product button next to Icon desired Display says Preheating to XXXF Beeper sounds briefly Display says Ready Select Product to start Display shows possible product selection for that temperature Select Product to start Display says Select shelf Press Product button next to desired shelf Display will show icon chosen and begin to count down Beeper sounds continuously Display shows DONE press button and remove product from that shelf Power to oven light switch 120 24 volt transformer energized 24 volts to 6 Johnson Control TH Channel Products and ground of spark module 24 volts to pilot valve coil of combination gas valve Pilot valve opens Gas flows to pilot burner Pilot burner lights 12 to 13 micro amps on pin 4 Johnson Control and Sens Channel products 24 volts from pin 3 Jo
34. TH PLUMBING IMPROPER INSTALLATION CAN CAUSE lt lt lt INJURY PERSONNEL AND OR DAMAGE EQUIPMENT UNIT MUST BE INSTALLED IN ACCORDANCE WITH ALL APPLICABLE CODES NOTICE The data plate is located above control panel behind wire mesh screen The oven serial number gas specifications and clearance specifications are on the data plate This information should be carefully read and understood before proceeding with the installation NOTICE The installation of any components such as a vent hood grease extractors fire extinguisher systems must conform to their applicable National State and locally recognized installation standards WARNING 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 RECEPTACLE DO NOT CUT OR REMOVE THIS GROUNDING PRONG FROM THE PLUG WARNING CONVECTION OVENS INSTALLED WITH CASTERS MUST HAVE THE FOLLOWING A CONNECTOR THAT COMPLIES WITH THE STANDARD FOR CONNECTORS FOR MOVABLE GAS APPLIANCES ANSI 221 69 LATEST EDITION A QUICK DISCONNECT THAT COMPLIES WITH THE gt STANDARD FOR QUICK DISCONNECT DEVICES FOR USE WITH GAS FUEL ANSI 221 141 LATEST EDITION A TETHER OR OTHER MEANS 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 NOTICE Kits designed to accomm
35. WITCH LIGHT xd F 3 power O Q e U SWITCH RTD 0 Al Lock HEAT Q O O O FROM ALAS LEN G 0 0 0 D 0 0 0 0 C MOTOR BUZZER X FRI N J EREM LIGHTS YYY 12 POSITION B SWITCH 24 TERMINAL BLOCK C 0 MOTOR BLK 0 HEAT q 24 ON 3 5 C a 24 216 UO 3 C OO A 69 Course ISOLATION us TRANSFORMER WHT W BLK E DOOR eo dus SWITEH 16 3 120V POWER FROM NC SUPPLY CONTROL CORD BLUE la DN 197 A Lo i 2 O SPEED SWITCH 5 15 0 NEMA PLUG 7 Bom POE ul BLACK p WIRE NUT 0 T7 T4 ev O m IGNITIDN E G MODULE TH oC S SNUBBER 100V MV S HI LIMIT SPARK SENSE DISC STAT PILO H O VOLTAGE GND CO GND Ld x fe 69 Q gt NUMBER DESCRIPTION 7 MATERIAL T ONT LANG MANUFACTURING COMBINATION VALVE GAS DR SRC DATE 12 14 94 TITLE W D GCCO S2 CK FD 12 14 94 120VAC NEXT HIGHER ASSY SHEET DRAWING NUMBER REV 1 61111 116 B 63 VISION BLOCK
36. ach the leg or caster to the leg supports supplied in the oven by following the instructions in the box then attach the leg support to the oven The adjustable feet on the bottom of each leg 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 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 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
37. ary for 24 VAC Replace transformer UBLESHOOTING GCCO SII CON PROBABLE CAUSE CORRECTIVE ACTION Igniter continues to spark after Check pilot for strong flame and good contact with sensor pilot is lit Check sense wire for 12 to 13 micro amps on spark module Johnson Control spark modules use 4 terminal and Channel spark modules use Sense terminal Turn oven off and check sense wire for continuity Replace sense wire or spark module as necessary Defective Module Confirm that there is a pilot ignition Check for 24VAC at MV to ground Defective Isolation Transformer Confirm that transformer is getting voltage Check transformer for normal operation Defective Circuit board Check for 24 VAC across Motor output on board and D on 12 position terminal block If no voltage is present gt Confirm that voltage is coming in from transformer gt Replace circuit board If voltage is present gt Check motor relay for normal operation 24 VAC 35Q gt Check door switch for normal gt Check motor for normal operation See Technical Data NO HEAT NOTE The motor needs to be operational before the oven will start heating PROBABLE CAUSE CORRECTIVE ACTION Defective Probe gt Confirm that probe is operating properly See Technical Data Defective Circuit board gt Confirm that Heat Call light is on If no light is detected gt Check 12 position switch for normal operation See Techn
38. as its own strapping configuration which must be set by the service technician Follow the diagram below for the proper strapping configuration ECCO C POWER SWITCH ECCO STM BACK OF CIRCUIT BOARD GCCO C GCCO STM EHS C 8 PIN CONNECTOR EN EN EN PROBE CONNECTION L RIBBON CONNECTOR GHS C ECHNICAL DATA CONT GCCO C TEST POINT LAYOUT TOTERMIHAL FROM POWER BLOCK POWER SWITCH BOTTON OF CONTROL ae CIRCUIT CONTROL 6 L 50 PIN CONNECTOR 20 CONNECTOR MICROPROCESSOR CIRCUIT BOARD i PIN COHHECTOR TEST POINT FOR TEMPERATURE 7 OUTPUT i SENSOR 5 YOC BUZZER RESET STRAPPING BARS gt CIRCUIT 5 sp 9 i CONNECTOR PIN CONNECTOR RIBBOH CONHECTOR 2 24 VOLTS AC INPUT 3 BLANK 4 HEAT OUTPUT 5 MOTOR OUTPUT 6 STEAM OUTPUT OPTIONAL 59 NICAL DATA GCCO PP PT TEST POINT LAYOUT MOTOR HIGH m MOTOR LOW C
39. be found on the oven data plate Hn INSTALLATK NSTALLATION 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 adjust 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 1 8 inch NPT tap is provided on the main manifold for checking regulator pressure Access the main manifold by removing the 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 sufficient 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
40. cated below the display labeled T1 T2 T3 and T4 will illuminate to indicate which Tier is being programmed or which Tier the program Is in during the cooking cycle PROGRAMMING ACTION DISPLAY Turn the power switch on If the oven is already on turn it off and then back on EntEr Quickly enter access code R C 1 6 2 7 3 8 Do not hold the R C button Prad Select a Product number from 0 9 Sk Select amount of time that product should steam If no steam is required press the shelf A button to advance to the next step GCF Note If oven is not strapped for steam convection then this step will not be provided Select a Temperature from 150 F 450 F NOTE Entering 000 will erase the existing CCLU 1 program Select the desired cooking curve from 0 7 FHna 12 Enter a desired Fan setting D naFRn Will make the fan pulse with the heat P FRinanh Will make the fan run on high continuously 2 FRnanLo Will make the fan run on low continuously ruv nmt LC Lut Enter the desired cooking time hours minutes seconds E OOF The program is now entered for a single tier program press the E button to continue programming other products If the program is a multi tiered program continue by programming the next tiers When complete press the E button Prod When the programs have been completely en
41. cessary Check spark electrode and hood of pilot burner Check spark gap Clean and re gap if necessary Check pilot burner for any evidence of moisture Dry pilot if necessary Replace spark module if above checks do not correct problem If 24 VAC is not measured Turn oven off Check 120 24 VAC transformer for 18 9 on the primary coil and 1 Qon the secondary coil Turn unit back on and check primary coil for 120 VAC and secondary for 24 VAC Replace transformer TROUBLESHOOTING GCC PROBABLE CAUSE CORRECTIVE ACTION Igniter continues to spark after gt Check pilot for strong flame and good contact with sensor pilot is lit lt Check sense wire for 12 to 13 micro amps on spark module Johnson Control spark modules use 4 terminal and Channel spark modules use Sense terminal Turn oven off and check sense wire for continuity Replace sense wire or spark module as necessary Defective Module Confirm that there is a pilot ignition Check for 24VAC at to ground Defective Isolation Transformer Confirm that transformer is getting voltage Check transformer for normal operation Defective Door switch Confirm that Door switch is getting voltage Check door switch for normal operation Defective Motor relay Confirm that motor relay is getting power Check motor relay for normal operation 24 VAC 39 Confirm that motor is getting power Check motor for normal operation HIGH P1 T7 T4 LOW P1 T9
42. d on the freight bill at the time of delivery and signed by the carrier s agent Concealed loss or damage means loss or damage which 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 Lang Manufacturing Company File your claim with the carrier Prior to un crating move the oven as near 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 LEG INSTALLATION Legs are available for both the single and double deck installations Single deck installations require a 27 inch leg Double deck installations require 6 inch legs or casters To install the 27 inch legs place some cardboard on the floor and gently tip the oven onto its back Fasten two legs to the oven s front corners using the four 5 16 inch bolts provided in the leg kit 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 last 27 inch leg onto the oven body on the control side rear Gently lift the oven rear remove the leg set to support the oven center and install it on the last rear corner To install the 6 inch legs or casters att
43. e the cursor to the next space Cooking curve may be any number between 0 and 100 SELECT COOKING CURVE 000 USE Av KEYS TO SELECT EXAMPLE 80 Select ENTER once to advance a the cursor one space then press A eight pz APPLE times for a 8 Select ENTER to advance the cursor Since 0 is the next number select ENTER to advance to TIER 1 the next screen TEMP 320F TIME 00 45 00 lt ACCEPT gt ENTER ACTION DISPLAY Step 12 SELECT FAN SPEED The cursor will SELECT FAN SPEED automatically appear under HIGH that is HIGH LOW your default setting Press ENTER or ACCEPT to keep high fan and advance to USE Av KEYS TO SELECT the next screen If LOW is the correct setting press the A or v to move the cursor to low Once low is selected select ENTER or ACCEPT to move to the next screen 5 APPLE TIER 1 TEMP 320F TIME 00 45 00 COOKING CURVE 80 gt ACCEPT lt ENTER 25 OGRAMMING GCCO PT CONT ACTION DISPLAY Step 13 SELECT PULSE RATE Press or v to SELECT PULE RATE select numbers select ENTER to move the 100 cursor to the next space 100 is the default If this okay select ENTER three USE Av KEYS TO SELECT times or ACCEPT once to advance to the next screen EXAMPLE 80 Press the y once for 0 Select 5 APPLE ENTER once to advance the cursor one space then press A eight times for a 8 Selec
44. e trouble shooting No heat PROBABLE CAUSE CORRECTIVE ACTION Pilot burner fails to light gt Perform the following trial ignition and look and listen for spark Attempt to light the pilot burner If the burner does not ignite after 30 seconds cycle power and repeat trial ignition The pilot may require several trials for ignition to bleed air from the gas piping After the initial attempt pilot should only require 2 5 seconds for normal start up Spark observed gt Check for 24 VAC at pilot valve If 24 VAC is measured turn oven off gt Check for pilot burner orifice for blockage Clean and repair as necessary Perform trial ignition as described in above section lt Replace gas valve If 24 VAC is not measured gt Check for 24 VAC at PV on spark module gt Check continuity on wire between PV on spark module and Pilot Valve No Spark observed Igniter continues to spark after pilot is lit Defective thermostat Defective over temp thermostat Defective Centrifugal switch Turn oven on Refer to wiring diagram and check for 24 VAC at the TH terminal on the spark module If 24 VAC is measured Turn unit off and Check large orange wire from igniter module to pilot burner for continuity and for insulation breaks Replace wire as necessary Check spark electrode and hood of pilot burner Check spark gap Clean and re gap if necessary Check pilot burner for any evidence of moisture Dry pil
45. eans that the fan will be on that many number of seconds in a 100 second block E g 67 on for 67 seconds in a 100 second block CONTINUE TO TIER 2 1 YES 2 NO NOX T1 XXXF CXX PXXX If your press 1 you will go through the same sequence as outlined above If you press 2 the next display will automatically appear A SET TIME B SET DATE C PROGRAM PRODUCTS D NEXT MENU PROGRAMMING 0600 ACTION DISPLAY Step 1 Turn the power switch on If the oven is already on press the CANCEL key until the following screen is displayed Step 2 Select gt RUN OVEN lt TIME DATE PROGRAM eae DATE 2 TIME DATE TEMP STATUS 12 00 01 01 01 325 STANDBY ACTION DISPLAY gt DISPLAY PRODUCT gt TIMER ONLY Step 3 Select gt SET TIME DATE gt PROGRAM COMPUTER lt PROGRAM COMPUTER TIME DATE TEMP STATUS 12 00 01 01 01 35 PROGRAM ACTION DISPLAY Step 4 Using the A and Y arrows enter access TER ACCESS code AB C DEF Press or Y to scroll through letters and numbers then select ENTER to move the cursor to the right USE v KEYS TO SELECT THEN PRESS ENTER EXAMPLE Press A once for an A then press ENTER Press A twice for 8 B then select ENTER Continue through The screen will then automatically advance once access code has been entered correctly gt ENTER PRESS CANCEL TO QUIT
46. ge around the front of the door Always weigh your product This will give you a more consistent size color and quality Center the pan in the oven The better the air flow around the product the better the bake The 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 preparation not the oven LOADING Place product as close to oven as practical Open oven doors and load quickly but carefully If only one pan is required load on center shelf If two pans are required load on second and fourth shelf If three pans are required load on top shelf bottom shelf and center shelf If four pans are required load on top shelf bottom shelf and middle two shelves If five shelves are required space evenly in oven See page 28 for more detail UNLOADING It is a characteristic of all convection ovens to unload the top shelf before the bottom shelves The rising of heat and the hot oven ceiling causes the top shelf to bake quicker This characteristic is more pronounced when baking at higher temperatures and or for prolonged periods of time ENERAL CONT FOUR PAN PAN YPICAL OPERATIO GCCO AP TYPICAL OPERATION SEQUENCE ACTION RESULT Turn power switch to ON Control panel heat call light comes on Adjust proper temperature between 140 amp 450 Oven begins heating degrees and allow to preheat up to 20 minutes
47. hnson Control and MV Channel products to isolation transformer 24 volt isolation transformer energizes 24 volts to pins 9 and 7 of circuit board 24 volts to motor relay through door switch and pulse fan switch Motor relay closes energizing motor and closing centrifugal switch 24 volts from circuit board to MV on combination valve through pulse switch centrifugal switch and over temperature thermostat Main burner ignites UENCE OF OPERATION Power to oven light switch 120 24 volt transformer energized 24 volts to 6 Johnson Control TH Channel Products and ground of spark module 24 volts to pilot valve coil of combination gas valve Pilot valve opens Gas flows to pilot burner Pilot burner lights 12 to 13 micro amps on pin 4 Johnson Control and Sens Channel products 24 volts from pin 3 Johnson Control and MV Channel products to isolation transformer 24 volt isolation transformer energizes 24 volts to pins 9 and 7 of circuit board 24 volts to motor relay through door switch and pulse fan switch Motor relay closes energizing motor and closing centrifugal switch 24 volts from circuit board to MV on combination valve through pulse switch centrifugal switch and over temperature thermostat Main burner ignites 1 Power to oven light switch 120 24 volt transformer energized 24 volts to TH and ground of spark module 24 volts to pilot valve coil of combination gas valve Pil
48. i 5 MOTOR Lock UP Fm R 5 BLK 1 4 BLK BLACK STEAM CONTROL 19 RED 23 BLU Q S n 5 c m 16 3 120V 54 RED d P4AVAC 4 NC C L Sa 4 CURD BACK UP 14 GEN 3 TSTAT 9 OPTIONAL M STEAM SOLINOID AOTRE RISA 7 gm 22 RED 48 7 T HI LIM SG RED A DISC 49 55 RED D S2 B u 3 BLK 50 BLK IGNITION a fe MODULE TH 64 BRN SPARK SENSED 65 HIG 5 VOLTAGE GND m A GND O SENSE 61 BRN TAGT MV py PART Bl ESCRIPTION MATERIAL COMBINATION VALVE Gas Ty ART HUMBER PESEM LANG MANUFACTURING DR SRC DATE 12 14 94 TITLE W D GCCO C CK FJD DATE 12 14 94 TOLERANCES FRACTIONS DECIMAL 120VAC NEXT HIGHER ASSY SHEE DRAWING NUVBER REV IN INCHES FIT tor 61111 117 C 64
49. ical Data If light is detected gt Check for 24VAC across heat output and on 12 Pole terminal If voltage is not present gt Replace Circuit board If voltage is present Check over temperature thermostat for proper operation Check door switch for normal operation Defective Centrifugal Switch Confirm that when motor is running that there is continuity through Centrifugal switch Defective Hi Limit Thermostat Check Hi Limit Thermostat for continuity Defective Solenoid Valve Confirm that Valve is getting voltage Check Valve for normal operation Plugged Main Burner Orifice Clean orifice OUBLESHOOTING GCC To help troubleshoot the oven you should perform the following Manual Override test Open drop down door located on the lower right side directly below front panel Turn back up toggle on off switch to position Turn main power switch to on position Check oven for normal operation NO DISPLAY PROBABLE CAUSE CORRECTIVE ACTION Power switch is not turned on Turn power switch on VV VV Y Defective power switch Check power switch for normal operation Replace as necessary Defective back up relay Check relay for normal operation Check coil for 24 VAC If 24 VAC is measured Turn oven off and gt Check coil for 80 Q gt Replace as necessary If 24 VAC is not measured gt Verify that manual override switch is in off position gt Check manual override switch f
50. ifice NO MOTOR DUBLESHOOTING GCCO PROBABLE CAUSE CORRECTIVE ACTION Defective power switch Defective Transformer Gas supply turned off Defective Pilot Spark observed No spark observed Check power switch for normal operation Replace as necessary Check Transformer for normal operation Turn gas supply on and check for proper gas pressure 5 water column for natural gas and 10 water column for propane Perform the following trial ignition and look and listen for spark Attempt to light the pilot burner If the burner does not ignite after 30 seconds cycle power and repeat trial ignition The pilot may require several trials for ignition to bleed air from the gas piping After the ignition attempt pilot should only require 2 5 seconds for normal start up gt Check for 24 VAC at pilot valve If 24 VAC is measured turn oven off gt Check for pilot burner orifice blockage Clean and repair as necessary gt Perform trial ignition as described in above section lt Replace gas valve If 24 VAC is not measured gt Check for 24 VAC at PV on spark module gt Check continuity on wire between PV on spark module and Pilot Valve Turn oven on Refer to wiring diagram and check for 24 VAC at the TH terminal on the spark module If 24 VAC is measured Turn oven off Check large orange wire from igniter module to pilot burner for continuity and for insulation breaks Replace wire as ne
51. 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 3 45 kPA 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 3 45 kPA Test for gas leaks Use a commercial leak detector or a soap and water solution FLU EXTENSION gt flu extension must be installed on the lower oven of a stacked set gt The extension attaches to the flu opening of the lower oven and directs the flu products into the flu opening of the upper oven gt This extension must be installed gt 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 floor Boo Gas Conversions Disconnect oven from power and gas Remove bottom trim piece from oven 2 hex head bolts and Phillips screw Remove side panel from oven Disconnect black manifold pipe from 3 8 aluminum pipe at the furrel nut Remove two Phillips screws holding black manifold pipe to oven Remove black manifold pipe from oven SD qs Remove both burner orifices from manifold and replace with new orifices making sure to apply pipe thread compound Remove two Phillips screws holdi
52. ire 2 5 seconds for normal start up gt Check for 24 VAC at pilot valve If 24 VAC is measured turn oven off gt Check for pilot burner orifice blockage Clean and repair as necessary gt Perform trial ignition as described in above section lt Replace gas valve If 24 VAC is not measured gt Check for 24 VAC at PV on spark module gt Check continuity on wire between PV on spark module and Pilot Valve Turn oven on Refer to wiring diagram and check for 24 VAC at the TH terminal on the spark module If 24 VAC is measured Turn oven off Check large orange wire from igniter module to pilot burner for continuity and for insulation breaks Replace wire as necessary Check spark electrode and hood of pilot burner Check spark gap Clean and re gap if necessary Check pilot burner for any evidence of moisture Dry pilot if necessary Replace spark module if above checks do not correct problem If 24 VAC is not measured Turn oven off Check 120 24 VAC transformer for 18 9 on the primary coil and 1 Qon the secondary coil Turn unit back on and check primary coil for 120 VAC and secondary for 24 VAC Replace transformer PROBABLE CAUSE CORRECTIVE ACTION Igniter continues to spark after gt Check pilot for strong flame and good contact with sensor pilot is lit gt Check sense wire for 12 to 13 micro amps on spark module Johnson Control spark modules use 4 terminal and Channel spark modules
53. k Ignitor NG Before F 79932 80300 04 Module Spark Ignitor LP Before F 79932 80300 05 Module Spark Ignitor NG amp LP After F 79933 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG Before F 87432 60101 63 Valve Combination Gas Conversion Kit NG to LP Before F 87432 80505 07 Valve Combination Gas 24 VAC NG After F 87433 80505 10 Valve Combination Gas Conversion Kit NG to LP After F 87433 80505 11 69 PARTS LIST GCCO C DESCRIPTION PART NO Motor 1 3 HP 115 230 Volt with Momentary Switch Before X 90068 30200 15 Motor 1 3 HP 115 Volt 2 Speed After V 90069 30200 35 Switch Micro Convection Oven Door 30301 02 Switch Toggle On Off 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open After G 70469 30401 09 Thermostat 450 F Oven 30402 27 Terminal Block 24 Position Quick Disconnect 30503 01 Relay 24 VAC 30600 04 Contactor 2 Pole 24 VAC Before X 90068 30701 04 Contactor 2 Pole 30 Amp 24 VAC After V 90069 30701 05 Power Cord with Molded Plug 31107 02 Cable Ribbon Assembly After G 70469 31110 01 Transformer 115 24 VAC 31400 07 Transformer 115 12 VAC 31400 21 Lamp Socket 31602 04 Lamp Incandescent 250 Volt Clear 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Circuit Board Assembly Buzzer After
54. ly and display says ShELF door and press the product button again Press the shelf button s which correspond to the Display shows a countdown timer and begins to shelf positions which the product is loaded A count toward zero equals the top shelf and E equals the bottom shelf Beeper sounds continuously Display shows donE shelf button s flash Press the flashing shelf button s Beeper stops Display shows if no other shelves carry product or resume count down for shelves that still have product cooking Open oven door and remove the product which corresponds to flashing shelf button s GCCO PP TYPICAL OPERATION SEQUENCE ACTION RESULT Turn power switch to ON Control panel comes on display says SELECT PRODUCT OR READ CLEAR TO PROGRAM Press a product button Display says PRODUCT X PREHEATING TO XXX F Motor starts and oven begins preheating to the programmed temperature Beeper sounds briefly Display says READY SELECT PRODUCT TO START Open the oven doors and load the product Close Beeper sounds briefly and display says SELECT the door and press the product button again OVEN SHELVES PRODUCT X Press the shelf button s which correspond to the Display shows a countdown timer and begins to shelf positions just left which the product is loaded count toward zero A equals the top shelf and E equals the bottom shelf Beeper sounds continuously Display shows DONE
55. ng pilot assembly to oven Remove pilot assembly from oven 10 Remove aluminum pipe from pilot assembly 11 Remove pilot orifice and replace with new pilot orifice 12 Re attach 4 aluminum pipe to pilot assembly 13 Re attach pilot assembly to oven 14 Re install black manifold assembly to oven making sure that the orifice 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 affix Caution sticker to the visible side of the combination valve 22 Re install bottom trim piece and side panel NG to LP LP to NG Part No Description Qty Part No Description Qty 80401 05 Pilot Orifice Drilled 010 1 80401 10 Pilot Orifice Drilled 018 1 80400 14 Main Burner Orifice Drilled 53 2 80400 13 Main Burner Orifice Drilled 43 2 Combination Gas Valve Spring Combination Gas Valve Spring Includes Includes 80505 11 1 Spring 1 80505 16 1 Spring 1 2 Seal Screw 2 Seal Screw 3 Caution Sticker 3 Caution Sticker GCCO AP
56. odate ovens from sea level to 5000 feet Contact factory for orifice sizes on installations above 5000 feet WARNING BEFORE LIGHTING USE A SOAP AND WATER SOLUTION TO TEST ALL JOINTS FOR GAS LEAKS NOTICE During the first 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 first few hours of use CAUTION ALWAYS KEEP THE AREA NEAR THE APPLIANCE FREE FROM COMBUSTIBLE MATERIALS IMPORTANT READ FIRST IMPORTANT CAUTION WARNING OCCUR CLEAN IMMEDIATELY TO AVOID THE DANGER OF SLIPS OR FALLS KEEP WATER AND SOLUTIONS OUT OF CONTROLS NEVER SPRAY OR KEEP FLOOR IN FRONT OF EQUIPMENT CLEAN AND DRY IF SPILLS CAUTION NOTICE NOTICE WARNING HOSE CONTROL CONSOLE 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 Service on this or any other LANG appliance must be performed by qualified personnel only Consult your authorized service station directory or call the factory at 1 800 224 LANG 5264 or WWW LANGWORLD COM For the service station
57. or normal operation gt Check wires for any shorts Gas supply turned off Turn gas supply on and check for proper gas pressure 5 water column for natural gas and 10 water column for propane Pilot light fails to light Perform the following trial ignition and look and listen for spark Attempt to light the pilot burner If the burner does not ignite after 30 seconds cycle power and repeat trial ignition The pilot may require several trials for ignition to bleed air from the gas piping After the ignition attempt pilot should only require 2 5 seconds for normal start up Spark observed gt Check for 24 VAC at pilot valve If 24 VAC is measured turn oven off gt Check for pilot burner orifice blockage Clean and repair as necessary Perform trial ignition as described in above section Replace gas valve If 24 VAC is not measured gt Check for 24 VAC at PV on spark module gt Check continuity on wire between PV on spark module and Pilot Valve No spark observed Turn one on Refer to wiring diagram and check for 24 VAC at the TH terminal on the spark module If 24 VAC is measured Turn oven off Check large orange wire from igniter module to pilot burner for continuity and for insulation breaks Replace wire as necessary Check spark electrode and hood of pilot burner Check spark gap Clean and re gap if necessary Check pilot burner for any evidence of moisture Dry pilot if necessary
58. ot if necessary Replace spark module if above checks do not correct problem If 24 VAC is not measured Turn oven off and Check 120 24 VAC transformer of 18 9 on the primary coil and 1 Q on the secondary coil Turn unit back on and check primary coil for 120 VAC and secondary for 24 VAC Replace if necessary Check pilot for strong flame and good contact with sensor Check sense wire for 12 to 13 amps on spark module Johnson Control spark modules use 4 terminal and Channel spark modules use sense terminal Turn oven off and check sense wire for continuity Replace sense wire or spark module as necessary Turn unit off and check for continuity while cycling thermostat on and off Replace if defective Check for 24 VAC on wire 55 on MV of spark module to ground If 24 VAC is not measured Turn oven off and gt Check for continuity through over temp thermostat Replace if defective If 24 VAC is measured Turn oven off and gt Check for continuity on the gas solenoid valve Replace if defective gt Check for 24 VAC on wire 55 on MV of spark module to ground If 24 VAC is not measured gt Check for 24 VAC on red wire coming out of motor to ground gt Replace if defective NOTE You can check for continuity through Centrifugal switch by turning thermostat off wile oven is still on If 24 VAC is measured Turn oven off and gt Check for continuity on the gas solenoid valve gt Replace
59. ot valve opens Gas flows to pilot burner Pilot burner lights 12 to 13 micro amps on pin 4 Johnson Control and Sens Channel products 24 volts from pin 3 Johnson Control and MV Channel products to isolation transformer 24 volt isolation transformer energizes 24 volts to pins and 2 of circuit board 24 volts at motor out put pin5 to ground 24 volts to motor relay through door switch and pulse fan switch Motor relay closes energizing motor and closing centrifugal switch 24 volts at heat out put to ground 24 volts from circuit board to MV on combination valve through pulse switch centrifugal switch and over temperature thermostat Main burner ignites UENCE OF OPERATION GC Power to oven light switch 120 volts to rows A and B of 24 pin terminal block 120 24 volt transformer energized 24 volts to rows C and D of 24 pin terminal block 24 volts to common of back up toggle switch 24 volts to pin A on back up relay 24 volts to 6 Johnson Control TH Channel Products and ground of spark module 24 volts to pilot valve coil of combination gas valve Pilot valve opens Gas flows to pilot burner Pilot burner lights 12 to 13 micro amps on pin 4 Johnson Control and Sens Channel products 24 volts from pin 3 Johnson Control and MV Channel products to common of back up toggle switch Circuit 1 24 volts across D and TP4 5 and TP6 24 volts to motor rela
60. otor 1 3 HP 115 230 Volt with Momentary Switch 30200 15 Motor 1 3 HP 115 Volt 2 Speed 30200 35 Micro Switch Oven Door 30301 02 Switch Toggle On On 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open 30401 09 Terminal Strip 3 Pole 30501 02 Contactor 2 Pole 24 VAC Before F 90068 30701 04 Contactor 2 Pole 24 VAC After H 90069 30701 05 Power Cord with Molded Plug 31107 02 Transformer 115 24 VAC 31400 07 Transformer 24 VAC Isolation After H 90069 31400 24 Transformer 115 12 VAC After H 90069 31400 26 Pilot Light 28 VAC 31601 07 Lamp Socket 31602 04 Lamp 250 Volt 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Circuit Board Temperature Control 40101 17 Circuit Board Buzzer 40102 10 Probe Pilot Flame Sensor 41100 07 Probe Temperature Sensor 41100 08 Turnbuckle Assembly 50312 02 Door Left Hand 51100 45 Door Right Hand 51100 46 Panel Label Before F 90068 60301 58 Panel Label 2 Speed Fan Before F 90068 60301 73 Panel Label After H 90069 60301 102 Door Handle Assembly Single Handle Oven 70603 15 Window Assembly 71301 04 Blower Wheel 71500 05 Bezel Control Board 72603 01 Bezel Fiber Spacer Before H 90435 20501 01 Bezel Screw Short Qty 1 Before H 90435 20102 19 Bezel Screw Long Qty 4 Before H 90435 20102 20 Bezel Washer Before H 90435 20201 13 Burner U Tube Steel 80002 05 1 Gas Manifold 80100 07 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spar
61. ower Wheel Steam Units 51100 57 Orifice Water Steam 60 DRL Steam Units 80405 01 Burner U Tube Steel 80002 05 1 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spark Igniter NG amp LP 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG 80505 10 Valve Combination Gas Conversion Kit NG to LP 80505 11 Wiring Harness Motor GCCO 608 Wiring Harness 120 Volt GCCO 609 Wiring Harness 24 Volt GCCO 610 71 PARTS LIST GCCO P1 DESCRIPTION PART NO Motor 1 3 HP 115 Volt 2 Speed 30200 35 Switch Micro Convection Oven Door 30301 02 Switch Toggle On Off 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open 30401 09 Thermostat 450 F Oven 30402 27 Terminal Block 24 Position Quick Disconnect 30503 01 Relay 24 VAC 30600 04 Contactor 2 Pole 24 VAC 30701 02 Contactor 2 Pole 30 Amp 24 VAC 30701 05 Power Cord with Molded Plug 31107 02 Cable Ribbon Assembly 31110 13 Transformer 115 24 12 VAC 31400 27 Lamp Socket 31602 04 Lamp Incandescent 250 Volt Clear 31603 09 Oven Lamp Lens Watch Glass 31604 01 Oven Lamp Lens Gasket 31604 02 Circuit Board Display 40102 25 Circuit Board Microprocessor 40102 26 Probe Pilot Flame Sensor 41100 07 Probe Temperature Sensor 41100 08 Oven Rack 50200 21 Oven Rack Slide 50200 59 Turnbuckle Assembl
62. r Timer Button Press to set desired time 13 Power Switch LED Display Product Button Used to program and store product into the computer Manual Program Button Used to input a one time only program LIGHTS Light switch Tier Indicator Displays what Tier cycle of a certain program is running Shelf Button Used to tell the oven which shelf the product is on Read Clear Button Used as a programming key Temperature Button Press at any time to display oven temperature ROL PANEL LAYOUT GCC Light switch Inspection light only LIGHTS Push toggle switch to the up On position to inspect product Switch 7 will automatically return to the off oi position POWER On 004 power switch AlphaNumeric Display Peace Secor BHO I lana Shelf Select Button Press roduct Se 4 to select shelf which gt select desired 4 6 A product will be placed 2 7 B EUR 4 9 D 5 0 M IP Button Read Clear Button Used anual Program Use when product being gg to read clear ked is f Prog Clear programs and to access cooked is for one time only program menu Function keys Keys active when a program option is displayed on ul EN display 4 Alpha Numeric Display Cancel button When
63. relay coil If no voltage is present gt Confirm that points are making If voltage is present gt Replace relay Defective component gt Confirm that 120VAC is feeding primary coil transformer gt Confirm that 24VAC is at secondary coil Defective motor relay gt Check for 24VAC at relay coil If no voltage is present gt Confirm that points are making If voltage is present gt Replace relay Defective motor gt Check for 120V AC across P1 and T7 T4 If no voltage is present gt Confirm that wires have continuity If voltage is present gt Replace motor NO MOTOR COMPUTER MODE IMPORTANT NOTICE Before trying to trouble shoot No Motor in Computer Mode confirm that motor is operational in Manual Mode PROBABLE CAUSE CORRECTIVE ACTION Defective output on CPU gt Check for 24VAC at JP12 for high or JP13 for low while oven is board calling for heat If no voltage is present Board is operating correctly If voltage is present gt Replace CPU Defective back up toggle switch Defective back up relay Defective component transformer Failed Ignition Defective Thermostat Defective centrifugal switch in motor Defective main valve gt Confirm that toggle switch is in the ON position gt Check toggle switch for normal operation gt Check for 120VAC at relay coil If no voltage is present gt Confirm that points are making If voltage is present Replace relay
64. rs in the display will cancel the current mode of the control and return the display to EntEr Temp When the Temperature Recall Button is pressed the display will indicate the internal oven temperature When released the display will revert to the previous readout Programming Terms Cooking Curve Cooking curve is a function of the computer that controls the cooking time If the temperature of the oven is lower than the programmed temperature the control will slow the timer down to compensate for the lower cooking temperature Cooking Curves from 0 no time adjustment to 7 maximum adjustment are available Cooking Curve 3 is the most commonly used However as a general rule the longer the cooking time the lower the cooking curve the shorter the cooking time the higher the cooking curve FAN FUNCTION The convection fan has two programmable options Fan On Fan 1 runs the convection fan continuously Fan Off Fan 0 leaves the fan off until heat 15 called for by the control In a convection oven the fan must come On whenever the heat comes On The convection fan can not be turned Off continuously TIER Tiered programming is the ability to change the cooking temperature or fan function during the cooking cycle As an example some products require the fan to be Off for the first half of the cooking cycle then turn On for the last half Tier 1 would be programmed with the fan in the Off mode then Tier 2 would be fan On The Tier lamps lo
65. s CHNICAL DATA CON GAS VALVE gt Gas Valve Coil gt 24 Volt input PV 28Q MV 28 Q SPECIFACTIONS BTU S W C GAS ELECTRICAL CONN WEIGHT MODEL NG LP CONNECTION SINGLE PAHCE NG LP GCCO 55 000 55 000 One 1 2 NPT One 120 VAC 7 1A 500 LBS 5 10 2GCCO 110 000 110 000 Two 1 2 NPT Two 120 VAC 7 1 1000 LBS 5 10 GCCO XD 60 000 60 000 One 1 2 NPT One 120 VAC 7 1 A 575 LBS 5 10 2GCCO XD 120 000 120 000 Two 1 2 NPT Two 120 71 1150188 5 10 GCCO PT PP COOKING CURVE CONVERSION Old Style Purple New Style Platinum Purple Plus 0 0 1 17 2 26 3 40 4 50 5 56 6 63 7 71 56 CHNICAL DATA CONT PROBE RESISTANCE TEMP RESISTANCE VOLT DROP TEMP RESISTANCE VOLT DROP Probe is factory checked at 350 F Must be completely disconnected from circuit board when measuring probe resistance Display will read HELP if probe is open or unplugged Any probe resistance can be multiplied by 2 milli amps 002 to determine voltage drop ECHNICAL DATA CONT GCCO C MODEL STRAPPING The Front Control panel of the Lang Purple computer must be configured to match the model of oven it is being installed in To configure the front control panel you must change the arrangement of the Strapping Bars located at the bottom of the circuit board just above the ribbon connection Each model h
66. s 120 VAC to motor 24 VAC across to ground on spark module 24 VAC across JP 2 to 24 VAC to MV on combination valve through centrifical switch on motor Main valve opens Main burner ignites 24 VAC to TH on spark module 24 VAC across PV on spark module to ground 24 VAC to on combination valve Pilot valve opens Pilot ignites 12 13 micro amps from SENSE on spark module 24 VAC across MV on spark module 24 VAC to motor relay Motor relay closes 120 VAC to motor 24 VAC across to ground on spark module 24 VAC across JP 2 to 24 VAC to MV on combination valve through centrifical switch on motor Main valve opens Main burner ignites Defective power switch Defective Transformer Gas supply turned off Defective Pilot Spark observed No spark observed Check power switch for normal operation Replace as necessary Check Transformer for normal operation Turn gas supply on and check for proper gas pressure 5 water column for natural gas and 10 water column for propane Perform the following trial ignition and look and listen for spark Attempt to light the pilot burner If the burner does not ignite after 30 seconds cycle power and repeat trial ignition The pilot may require several trials for ignition to bleed air from the gas piping After the ignition attempt pilot should only requ
67. s not measured on primary Defective rectifier Note Display should now be operating Check wires for any shorts Check for no less than 10 5 VAC on TP1 and 5 VDC on TP2 If correct voltage is present at TP1 and present but low at TP2 unplug both ribbon connections from CPU and re measure at TP2 If voltage remains low at TP2 replace CPU 40102 311 If voltage at TP2 increased to 5 VDC when ribbon was unplugged plug ribbon back in to CPU and disconnect from Interface board Re measure at TP2 If voltage dropped to below 5 VDC replace ribbon cable 31110 01 If voltage remains at 5 VDC plug ribbon back into Interface board and measure for 5 VDC at TP3 If voltage is present at TP3 and display is still not on press and hold the R C button on board if LED s come on replace Interface board If LED segment does not illuminate or the LED is blank replace LED UBLESHOOTING GCCO C NO FAN Manual Mode PROBABLE CAUSE CORRECTIVE ACTION Defective 120 24 VAC gt Check for 24 VAC on and D of the terminal block transformer If 24 VAC is not measured Turn off and gt Check secondary coil for 1 Q gt Check primary coil for 18 9 gt Replace transformer If 24 VAC is measured Turn off and gt Check back up relay for normal operation Back up relay not energizing gt Check for 24 VAC on relay coil If 240 VAC is measured Turn unit off and gt Check back up relay coil for 80 Q
68. t ENTER to advance the cursor Since 0 is the next number select TIER 1 ENTER to advance to the next screen TEMP 320F TIME 00 45 00 FAN HI COOKING CURVE 80 gt ACCEPT gt ENTER ACTION DISPLAY Step 14 CORRECT The cursor automatically appears on YES The computer is asking YES NO if the program displayed is correct If any part of that program is incorrect press or USE Av KEYS TO SELECT v till the cursor is on NO Select ENTER or ACCEPT This will return you to step 7 Selecting YES will advance the 5 zz APPLE TIER 1 TEMP 320F TIME 00 45 00 FAN HI RATE 100 COOKING CURVE 80 lt ACCEPT lt ENTER 26 ACTION DISPLAY Step 15 CONTINUE TO NEXT TIER The cursor ONTINUE TO NEXT TIER automatically appears on NO Select YES NO ENTER or ACCEPT to end programming or move the cursor with the A or to USE Av KEYS TO SELECT YES This will allow you to enter another tier to this program Repeat steps 6 14 to program second tier rj APPLE TIER 1 TEMP 320F TIME 00 45 00 FAN HI RATE 100 COOKING CURVE 80 gt ACCEPT gt ENTER ACTION DISPLAY Step 16 After programming the last tier select NO gt CREATE NEW PRODUCT when asked CONTINUE TO NEXT TIER the computer will automatically advance the screen to program more products If no lt EDIT PRODUCT other products need to be programmed select CANCEL
69. tered press the R C button to save and exit the programming cycle EntEr GCCO C STATUS DISPLAY The Status Display informs the operator of the oven s status It can be used as a countdown timer shelf in use or internal oven temperature display during the cooking cycle see GCCO C Programming Codes The Display informs the operator when the oven is ready to bake or if the oven is above or below the programmed temperature Below is a list of displays and their definitions The oven is energized and ready an operator command PrEhE Stands for PREHEAT A product has been selected and the oven is heating to the programmed temperature rERd A product has been selected and the oven has preheated to the programmed temperature The oven is ready to load a product cool The oven s internal temperature is below what is programmed hok The oven s internal temperature is above what is programmed SRELF A product selection has been made after the oven has preheated and the computer is asking which shelf the product is placed on HELP There is a fault in the control system the computer will not operate until service is performed cont Stands for CONTINUOUS The oven has been programmed without a time being entered The oven will operate continuously at the programmed temperature Error An entry has been made during the programming which the computer does not understand GC
70. when disconnecting any ribbon cable or any connector from CPU or Display Failure to do so will result in damage to the Display board and CPU NO DISPLAY Defective Power Switch PP only Defective Power Switch output on circuit board JP37 Defective Control Transformer Defective Display Confirm that toggle switch is getting correct voltage Check power switch for normal operation Confirm that JP37 has 5VDC in the off position and nominal voltage in the on position If JP37 has a constant 5 check toggle switch for normal operation Confirm that 208 240V AC 15 feeding primary coil Confirm that 24V AC and 12V AC is at 40 24V AC across solid yellow wires and 12VAC from one solid yellow wire to yellow with red stripe Check ribbon cable connections Confirm that voltage is present at JP40 If no voltage is present gt Replace control transformer If voltage is present gt Confirm that CPU has SVDC at 1 this means that the CPU is getting correct voltage gt Confirm that CPU has 12VDC at TP2 this means that the CPU is sending out the correct voltage If no voltage is present Replace CPU If voltage is present Replace display NO MOTOR MANUAL MODE PROBABLE CAUSE CORRECTIVE ACTION Defective back up toggle gt Confirm that toggle switch is in the ON position switch gt Check toggle switch for normal operation Defective back up relay gt Check for 24VAC at
71. y 50312 02 Door Left Hand 51100 45 Door Right Hand 51100 46 Panel Label Platinum 60101 882 Valve Manual Main Water Supply Steam Units 70400 02 Valve Manual Water Supply Steam Units 70402 08 Valve Solenoid 24 60V Water Supply Steam Units 70403 01 Regulator Water Supply Steam Units 70404 01 Handle Assembly Single Handle Oven 70603 15 Knob Thermostat 450 F Oven 70701 17 Window Assembly Oven Door 71301 04 Blower Wheel 71500 05 Blower Wheel Steam Units 51100 57 Orifice Water Steam 60 DRL Steam Units 80405 01 Burner U Tube Steel 80002 05 1 Pilot Burner Assembly 80201 14 Pilot Tube 60102 1381 Module Spark Ingitor NG amp LP 80300 08 Orifice Main Burner 0890 43 DRL NG 80400 13 Orifice Main Burner 0595 53 DRL LP 80400 14 Orifice Pilot Burner 010 DRL LP 80401 05 Orifice Pilot Burner 018 DRL NG 80401 10 Valve Combination Gas 24 VAC NG 80505 10 Valve Combination Gas Conversion Kit NG to LP 80505 11 Wiring Harness Motor GCCO 608 Wiring Harness 120 Volt GCCO 609 Wiring Harness 24 Volt GCCO 610 72 73
72. y through door switch Motor centrifugal switch closes Circuit 2 24 volts to terminal B on back up relay Back up relay closes energizing 120 12 volt transformer 12 volts to TP1 Computer starts Product selected from Control panel 24 volts from TP5 through safety thermostat through centrifugal switch in motor to main valve coil of gas combination valve Main valve opens Gas flows to main burners Main burners light Circuit 1 24 volts to motor relay Motor relay closes Motor centrifugal switch closes Circuit 2 24 volts to Back up thermostat Temperature set on Back up thermostat 24 volts from Back up thermostat through safety thermostat through centrifugal switch in motor to main valve coil of Gas combination valve Main valve opens Gas flows to main burners Main burners light 120 VAC across of 24 pin terminal block 120 VAC across Common on light relay 120 VAC across Common on cooling fan relay 120 VAC to control transformer 120 24 12 and Component transformer 120 24 24 VAC across JP1 and 24 VAC across TH and ground on spark module 24 VAC across PV and ground on spark module 24 VAC across PV on combination valve Pilot valve opens Pilot ignites 12 13 micro amps from SENSE on spark module 24 VAC across MV on spark module 24 VAC across JP12 and 24 VAC across motor relay coil Motor relay close

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