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Lang GCCO-T Service Manual

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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

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  • Page 1 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...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER PAGE TABLE OF CONTENTS ...............2 READ FIRST..................3 EQUIPMENT DESCRIPTION ..............5 INSTALLATION..................7 START-UP ...................10 CONTROL PANEL LAYOUT..............11 PROGRAMMING TERMS..............17 PROGRAMMING .................18 GENERAL OPERATION ..............28 10. TYPICAL OPERATION ...............30 11. SEQUENCE OF OPERATION .............33 12. TROUBLESHOOTING .................37 13. TECHNICAL DATA ................55 14.
  • Page 3 IMPORTANT READ FIRST IMPORTANT CAUTION THE OVEN WEIGHS 500 LBS. FOR SAFE HANDLING, INSTALLER 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.

  • Page 4: Read First

    IMPORTANT READ FIRST IMPORTANT CAUTION KEEP FLOOR IN FRONT OF EQUIPMENT CLEAN AND DRY. IF SPILLS OCCUR, CLEAN IMMEDIATELY, TO AVOID THE DANGER OF SLIPS OR FALLS. WARNING KEEP WATER AND SOLUTIONS OUT OF CONTROLS. NEVER SPRAY OR HOSE CONTROL CONSOLE. CAUTION MOST CLEANERS ARE HARMFUL TO THE SKIN, EYES, MUCOUS MEMBRANES AND CLOTHING.

  • Page 5: Equipment Description

    The GCCO oven is a forced air convection oven with a vented oven cavity. • 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-SII), “Purple” Computer (GCCO-C), “Purple Plus” Computer (GCCO-PP), “Platinum” Computer (GCCO-PT): •...
  • Page 6 EQUIPMENT DESCRIPTION CONT’D • GCCO-PT Icon-driven (touch) panel allows for easy operation, also includes a manual override system. Day-Part Memory capabilities allow operators to “recall” the last daily selections automatically. Programmable up to 99 products, advanced baking capabilities include: a 12:59:59 timer with ten “tiers”...

  • Page 7: Installation

    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.

  • Page 8: Gas Connection

    INSTALLATION CONT’D 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.

  • Page 9: Gas Conversions

    INSTALLATION CONT’D 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.

  • Page 10: Start-Up

    START-UPS GCCO-AP / 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 Propane 3) Incoming Voltage L1______ 4) Motor amp draw...

  • Page 11: Control Panel Layout

    CONTROL PANEL GCCO-T Vent Knob. Power switch. Light switch. Inspection light LIGHT only. Push toggle switch to the up position to inspect product. Switch will automatically return to the off position. PULSE FAN HI-SPEED Pulse fan switch. Pulse fan Dual speed switch.
  • Page 12 CONTROL PANEL GCCO-AP Vent Knob. Power switch. LIGHT Light switch. Inspection light only. Push toggle switch to the up position to inspect product. Switch will automatically return to the off position. PULSE FAN HI-SPEED Dual speed switch. Pulse fan switch. Pulse fan Toggles the fan between setting will only turn the fan high and low speed.
  • Page 13 CONTROL PANEL GCCO-SII Vent Knob. Power switch. LIGHT COOK N HOLD Light switch. Inspection light only. Cook N Hold switch. Push toggle switch to the up Oven will automatically position to inspect product. Switch drop to 140°F when oven will automatically return to the off timer stops timing down.
  • Page 14 CONTROL PANEL LAYOUT GCCO-C Light switch Power Switch LED Display Tier Indicator: Displays what Tier (cycle) of a certain program is running. Product Button: Used to Shelf Button: Used to tell the program and store product oven which shelf the product into the computer.
  • Page 15 CONTROL PANEL LAYOUT GCCO-PP LIGHTS Light switch. Inspection light only. Push toggle switch to the up position to inspect product. Switch will automatically return to the off position. POWER Power switch. AlphaNumeric Display. Shelf Select Button. Press Product Select Button. to select shelf which Press to select desired product will be placed.
  • Page 16 CONTROL PANEL LAYOUT GCCO-PT Function keys. Keys are active when a program option is displayed on Alpha-Numeric Display. display. Cancel button. When Light switch. Inspection light only. scrolling through menu’s Push for light to come on. Light will this will allow you to back automatically turn off.

  • Page 17: Programming Terms

    PROGRAMMING TERMS 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.

  • Page 18: Programming

    PROGRAMMING GCCO-C PROGRAMMING ACTION DISPLAY Turn the power switch on. If the oven is already on, enter turn it off and then back on. Quickly enter access code “R/C 1 6 2 7 3 8”. Do prod not hold the R/C button. Select a Product number from 0-9.
  • Page 19 PROGRAMMING GCCO-C CONT’D 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.
  • Page 20 PROGRAMMING GCCO-C CONT’D GCCO-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”...
  • Page 21 PROGRAMMING GCCO-PP ACTION DISPLAY SELECT PRODUCT OR Turn the power switch on. If the oven is already on, press the Read / Clear key until the following screen READ/CLEAR TO is displayed. PROGRAM XX:XXPM XXXF Enter access code “1 6 2 7 3 8”. A: SET TIME B: SET DATE C: PROGRAM PRODUCTS...
  • Page 22 PROGRAMMING GCCO-PT 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: RUN OVEN TIME / DATE / PROGRAM. TIME / DATE / PROGRAM TIME DATE TEMP...
  • Page 23 PROGRAMMING GCCO-PT CONT’D ACTION DISPLAY Step 5. Select: PROGRAM PRODUCTS EDIT READY ZONE PROGRAM PRODUCTS EDIT ACCESS CODE ENABLE MANUAL PRODUCT CONFIGURE TIME OF DAY ACTION DISPLAY Step 6. Select: CREATE NEW PRODUCT EDIT PRODUCT CREATE NEW PRODUCT DELETE PRODUCT EDIT PRODUCT ACTION DISPLAY...
  • Page 24 PROGRAMMING GCCO-PT CONT’D ACTION DISPLAY SELECT PRODUCT NAME Step 8. “SELECT PRODUCT NAME” is where you spell the name using the to select APPETIZER A each letter. Then select “ENTER” to move KEYS TO SELECT the cursor to the next space and select a new letter.
  • Page 25 PROGRAMMING GCCO-PT CONT’D ACTION DISPLAY SELECT COOKING CURVE Step 11. “SELECT COOKING CURVE”. Press 000 % to select numbers, select “ENTER” to move the cursor to the next space. Cooking curve may be any number between 0% and KEYS TO SELECT 100%.
  • Page 26 PROGRAMMING GCCO-PT CONT’D ACTION DISPLAY SELECT PULE RATE Step 13. “SELECT PULSE RATE”. Press 100 % select numbers, select “ENTER” to move the cursor to the next space. 100% is the default. If this okay, select “ENTER” three KEYS TO SELECT times or “ACCEPT”...
  • Page 27 PROGRAMMING GCCO-PT CONT’D ACTION DISPLAY CONTINUE TO NEXT TIER Step 15. “CONTINUE TO NEXT TIER”. The cursor automatically appears on “NO”. Select “ENTER” or “ACCEPT” to end programming KEYS TO SELECT or move the cursor with the “YES”. This will allow you to enter another tier to this program.

  • Page 28: General Operation

    GENERAL 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%.
  • Page 29 GENERAL CONT’D ONE PAN TWO PAN THREE PAN FOUR PAN FIVE PAN...

  • Page 30: Typical Operation

    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-T TYPICAL OPERATION SEQUENCE ACTION RESULT Turn power switch to ON. Adjust proper temperature, between 140 & 450 Oven begins heating.
  • Page 31 TYPICAL OPERATION CONT’D 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 “PREHT” (Preheat), oven begins to heat to the programmed temperature. Beeper sounds briefly.
  • Page 32 TYPICAL OPERATION CONT’D 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”.

  • Page 33: Sequence Of Operation

    SEQUENCE OF OPERATION GCCO-T Power to oven light switch . 120/24-volt transformer energized. 24 volts to 6 (Johnson Control), TH (Channel Products), and ground of spark module. Spark module begins sparking at pilot burner. 24 volts to pilot valve coil of combination gas valve.
  • Page 34 SEQUENCE OF OPERATION GCCO-SII Power switch turned to “ON” position. Power to oven light switch . 120/24-volt transformer energized. 24 volts to TH, and ground of spark module. Spark module begins sparking at pilot burner. 24 volts to pilot valve coil of combination gas valve. Pilot valve opens.
  • Page 35 SEQUENCE OF OPERATION GCCO-C Power switch turned to “ON” position. 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.
  • Page 36 SEQUENCE OF OPERATION GCCO-PP/PT Oven plugged in. 120 VAC across “A” and “B” 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). Power switched to “ON”...

  • Page 37: Troubleshooting

    TROUBLESHOOTING GCCO-T NO MOTOR PROBABLE CAUSE CORRECTIVE ACTION Defective power switch Check power switch for normal operation. Replace as necessary. Defective Transformer Check Transformer for normal operation. Gas supply turned off Turn gas supply on and check for proper gas pressure. 5” water column for natural gas and 10”...
  • Page 38 TROUBLESHOOTING GCCO-T CONT’D 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”...
  • Page 39 TROUBLESHOOTING GCCO-AP NO MOTOR PROBABLE CAUSE CORRECTIVE ACTION Defective power switch Check power switch for normal operation. Replace as necessary. Defective Transformer Check Transformer for normal operation. Gas supply turned off Turn gas supply on and check for proper gas pressure. 5” water column for natural gas and 10”...
  • Page 40 TROUBLESHOOTING GCCO-AP 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”...
  • Page 41 TROUBLESHOOTING GCCO-SII NO MOTOR PROBABLE CAUSE CORRECTIVE ACTION Defective power switch Check power switch for normal operation. Replace as necessary. Defective Transformer Check Transformer for normal operation. Gas supply turned off Turn gas supply on and check for proper gas pressure. 5” water column for natural gas and 10”...
  • Page 42 TROUBLESHOOTING GCCO-SII CONT’D 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”...
  • Page 43 TROUBLESHOOTING GCCO-C 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 “on” position. Turn main power switch to “on” position. Check oven for normal operation.
  • Page 44 TROUBLESHOOTING GCCO-C CONT’D PROBABLE CAUSE CORRECTIVE ACTION 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.
  • Page 45 TROUBLESHOOTING GCCO-C CONT’D PROBABLE CAUSE CORRECTIVE ACTION Defective control transformer Check transformer for normal operation. (12 VAC). Check primary coil for 120 VAC and 154.1 Ω. Check secondary coil for no less than 10.5 VAC and 1 Ω. If voltage is measured on primary: Check for voltage on secondary.
  • Page 46 TROUBLESHOOTING GCCO-C CONT’D NO FAN-Manual Mode PROBABLE CAUSE CORRECTIVE ACTION Defective 120/24 VAC Check for 24 VAC on “C” and “D” of the terminal block. transformer If 24 VAC is not measured: Turn off and: Check secondary coil for 1 Ω. Check primary coil for 18.9 Ω.
  • Page 47 TROUBLESHOOTING GCCO-C CONT’D NO MOTOR COMPUTER MODE PROBABLE CAUSE CORRECTIVE ACTION No 24 VAC on Interface Check for 24 VAC at TP4 to common (“D”). board If 24 VAC is not measured: Confirm that back up relay is energizing. Replace if defective. If 24 VAC is measured: Check for 24 VAC at TP5.
  • Page 48 TROUBLESHOOTING GCCO-C CONT’D PROBABLE CAUSE CORRECTIVE ACTION No Spark observed 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.
  • Page 49 TROUBLESHOOTING GCCO-C CONT’D NO HEAT Computer Mode PROBABLE CAUSE CORRECTIVE ACTION No 24 VAC on Interface Check for 24 VAC at TP4 to ground. board If 24 VAC is not measured: Check back-up switch for normal operation. If 24 VAC is measured: Check for 24 VAC at TP6.
  • Page 50 TROUBLESHOOTING GCCO-PP / -PT 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 “on” position. Turn main power switch to “on”...
  • Page 51 TROUBLESHOOTING GCCO-PP / -PT CONT’D NO DISPLAY PROBABLE CAUSE CORRECTIVE ACTION Confirm that toggle switch is getting correct voltage. Defective Power Switch (-PP only) Check power switch for normal operation. Confirm that JP37 has 5VDC in the off position and nominal voltage Defective Power Switch output on circuit board in the on position.
  • Page 52 TROUBLESHOOTING GCCO-PP / -PT CONT’D NO MOTOR, MANUAL MODE PROBABLE CAUSE CORRECTIVE ACTION Confirm that toggle switch is in the “ON” position. Defective back-up toggle switch Check toggle switch for normal operation. Check for 24VAC at relay coil. Defective back-up relay If no voltage is present: Confirm that points are making.
  • Page 53 TROUBLESHOOTING GCCO-PP / -PT CONT’D NO HEAT, MANUAL MODE PROBABLE CAUSE CORRECTIVE ACTION Confirm that toggle switch is in the “ON” position. Defective back-up toggle switch Check toggle switch for normal operation. Defective back-up relay Check for 120VAC at relay coil. If no voltage is present: Confirm that points are making.
  • Page 54 TROUBLESHOOTING GCCO-PP / -PT CONT’D 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 Check for 24VAC at JP2 (while oven is calling for heat). Defective output on CPU board If no voltage is present:...

  • Page 55: Technical Data

    TECHNICAL DATA TRANSFORMER RESISTANCE TRANSFORMER Input Primary Secondary Output 120/24 Volt 120 Volt 18.9 Ω 24 Volt 1Ω 154.1 Ω 1 Ω 120/12 Volt 120 Volt 12 Volt 2.7 Ω 3.4 Ω 24/24 Volt 24 Volt 24 Volt CONTACTOR RESISTANCE CONTACTOR Coil 6 Ω...

  • Page 56: Gas Valve

    TECHNICAL DATA CONT’D GAS VALVE Gas Valve Coil PV 28 Ω MV 28 Ω 24 Volt input SPECIFACTIONS BTU’S ELECTRICAL CONN. MODEL WEIGHT CONNECTION (SINGLE PAHCE) GCCO 55,000 55,000 One 1/2” NPT One 120 VAC, 7.1A 500 LBS 5” 10” 2GCCO 110,000 110,000...
  • Page 57 TECHNICAL DATA CONT’D PROBE RESISTANCE TEMP RESISTANCE VOLT DROP TEMP RESISTANCE VOLT DROP 556 Ω 1.11 881 Ω 1.76 70° 290° 569 Ω 897 Ω 1.14 1.79 80° 300° 583 Ω 1.17 914 Ω 1.83 90° 310° 596 Ω 931 Ω 1.19 1.86 100°...
  • Page 58 TECHNICAL DATA CONT’D 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.
  • Page 59 TECHNICAL DATA CONT’D GCCO-C TEST POINT LAYOUT TP 1 TP 2 TP 4 TP 3...
  • Page 60 TECHNICAL DATA CONT’D GCCO-PP / -PT TEST POINT LAYOUT MOTOR HIGH MOTOR LOW STEAM ECCO / GCCO LIGHTS POWER YELLOW YELLOW / RED POWER YELLOW YELLOW PURPLE PLUS YELLOW POWER SWITCH YELLOW ECCO / GCCO PURPLE PLUS YELLOW POWER SWITCH YELLOW DOOR SWITCH YELLOW...

  • Page 61: Wiring Diagrams

    WIREING DIAGRAM GCCO-T...
  • Page 62 WIRING DIAGRAM GCCO-AP...
  • Page 63 WIRING DIAGRAM GCCO-SII...
  • Page 64 WIRING DIAGRAM GCCO-C...
  • Page 65 WIRING DIAGRAM GCCO-PP...
  • Page 66 WIRING DIAGRAM GCCO-PT...

  • Page 67: Parts List

    PARTS LIST GCCO-T 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...
  • Page 68 PARTS LIST GCCO-AP 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 30304-16 Switch Temperature Control 12 Position 140-450°F 30401-09 Thermostat Safety 490°F Open Terminal Strip 3 Pole 30501-02 Contactor 2 Pole 24 VAC...
  • Page 69 PARTS LIST GCCO-SII DESCRIPTION PART NO. Motor 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 30401-09 Thermostat Safety 490°F Open Terminal Strip 3 Pole 30501-02 Contactor 2 Pole 24 VAC (Before F-90068)
  • Page 70 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 30401-09 Thermostat Safety 490°F Open (After G-70469)
  • Page 71 PARTS LIST GCCO-PP 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 30401-09 Thermostat Safety 490°F Open 30402-27 Thermostat 450°F Oven Terminal Block 24 Position Quick Disconnect 30503-01 Relay 24 VAC 30600-04...
  • Page 72 PARTS LIST GCCO-PT 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 30401-09 Thermostat Safety 490°F Open 30402-27 Thermostat 450°F Oven Terminal Block 24 Position Quick Disconnect 30503-01 Relay 24 VAC 30600-04...
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