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 service manual for the lang models: gcco-t, gcco-ap, gcco-sii, gcco-c, gcco-pp, gcco-pt,.
2 table of contents chapter page 1. Table of contents .......................................................................2 2. Read first........................................................................................3 3. Equipment description ................................................
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. Cauti...
4 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, ey...
5 equipment description lang model: gcco gas full size convention oven exterior • 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. • the oven doors come standard with ...
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...
7 installation receiving the oven upon receipt, check for freight damage, both visible and concealed. Visible damage should be noted on the freight bill at the time of delivery and signed by the carrier's agent. Concealed loss or damage means loss or damage, which does not become apparent until the ...
8 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 fu...
9 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. Remove two phillips screws holdi...
10 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 ______ 5) are programs correct? Yes no 6) verify a...
11 control panel gcco-t time temp pulse fan hi-speed fan low-speed light on off power switch. 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 switch. Pulse fan setting will only turn the fa...
12 control panel gcco-ap time temp pulse fan hi-speed fan low-speed light on off power switch. 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 switch. Pulse fan setting will only turn the f...
13 control panel gcco-sii power switch. 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 switch. Pulse fan setting will only turn the fan on when the oven is calling for heat. Dual speed swi...
14 control panel layout gcco-c 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. Power switch led display read/clear button: used as a programming key. Temperature button: press at any time to d...
15 control panel layout gcco-pp power switch. Light switch. Inspection light only. Push toggle switch to the up position to inspect product. Switch will automatically return to the off position. Alphanumeric display. Shelf select button. Press to select shelf which product will be placed. Product se...
16 control panel layout gcco-pt power switch. Light switch. Inspection light only. Push for light to come on. Light will automatically turn off. Alpha-numeric display. Arrow down button. Allows you to scroll down. Function keys. Keys are active when a program option is displayed on display. Cancel b...
17 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 ...
18 programming gcco-c 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. Prod select a product number from 0-9. St: 00 select amount of time that product should s...
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 o...
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...
21 programming gcco-pp 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 xx:xxpm xxxf enter access code “1 6 2 7 3 8”. A: set time b: set date c: program products d: next men...
22 programming gcco-pt action display run oven time / date / program time date temp status 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: time / date / program. 12:00 01/01/01 325 standby action display dis...
23 programming gcco-pt cont’d action display step 5. Select: program products program products edit ready zone edit access code enable manual product configure time of day action display step 6. Select: create new product create new product edit product delete product edit product action display ste...
24 programming gcco-pt cont’d action display step 8. “select product name” is where you spell the name using the or to select each letter. Then select “enter” to move the cursor to the next space and select a new letter. Note: “appetizer a” is the name that must be replaced with the new product name...
25 programming gcco-pt cont’d action display select cooking curve 000 % use keys to select apple tier 1 temp: 320f time: 00:45:00 step 11. “select cooking curve”. Press or to select numbers, select “enter” to move the cursor to the next space. Cooking curve may be any number between 0 % and 100 %. E...
26 programming gcco-pt cont’d action display select pule rate 100 % use keys to select apple tier 1 temp: 320f time: 00:45:00 fan: hi cooking curve: 80 % step 13. “select pulse rate”. Press or to select numbers, select “enter” to move the cursor to the next space. 100 % is the default. If this okay,...
27 programming gcco-pt cont’d action display continue to next tier yes no use keys to select apple tier 1 temp: 320f time: 00:45:00 fan: hi rate: 100 % cooking curve: 80 % step 15. “continue to next tier”. The cursor automatically appears on “no”. Select “enter” or “accept” to end programming or mov...
28 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 ove...
29 general cont’d one pan two pan three pan four pan five pan.
30 typical operation gcco-ap typical operation sequence action result turn power switch to on. Control panel heat call light comes on. Adjust proper temperature, between 140 & 450 degrees and allow to preheat up to 20 minutes. Oven begins heating. Open oven doors and insert product, set timer up to ...
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 b...
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 “prehe...
33 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. Pilot valve opens. ...
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. ...
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. 24 volts to...
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” positi...
37 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...
38 troubleshooting gcco-t cont’d probable cause corrective action igniter continues to spark after pilot is lit check pilot for strong flame and good contact with sensor. Check sense wire for 12 to 13 micro amps on spark module. (johnson control spark modules use “#4” terminal and channel spark modu...
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” wate...
40 troubleshooting gcco-ap probable cause corrective action igniter continues to spark after pilot is lit check pilot for strong flame and good contact with sensor. Check sense wire for 12 to 13 micro amps on spark module. (johnson control spark modules use “#4” terminal and channel spark modules us...
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” wat...
42 troubleshooting gcco-sii cont’d probable cause corrective action igniter continues to spark after pilot is lit check pilot for strong flame and good contact with sensor. Check sense wire for 12 to 13 micro amps on spark module. (johnson control spark modules use “#4” terminal and channel spark mo...
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 ...
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 ...
45 troubleshooting gcco-c cont’d probable cause corrective action defective control transformer (12 vac). Check transformer for normal operation. 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 o...
46 troubleshooting gcco-c cont’d no fan-manual mode probable cause corrective action defective 120/24 vac transformer check for 24 vac on “c” and “d” of the terminal block. If 24 vac is not measured: turn off and: check secondary coil for 1 Ω. Check primary coil for 18.9 Ω. Replace transformer. If 2...
47 troubleshooting gcco-c cont’d no motor computer mode probable cause corrective action no 24 vac on interface board check for 24 vac at tp4 to common (“d”). 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. Re...
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,...
49 troubleshooting gcco-c cont’d no heat computer mode probable cause corrective action no 24 vac on interface board check for 24 vac at tp4 to ground. If 24 vac is not measured: check back-up switch for normal operation. If 24 vac is measured: check for 24 vac at tp6. Replace interface board if def...
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” position. Chec...
51 troubleshooting gcco-pp / -pt cont’d no display probable cause corrective action defective power switch (-pp only) confirm that toggle switch is getting correct voltage. Check power switch for normal operation. Defective power switch output on circuit board (jp37) confirm that jp37 has 5vdc in th...
52 troubleshooting gcco-pp / -pt cont’d no motor, manual mode probable cause corrective action defective back-up toggle switch confirm that toggle switch is in the “on” position. Check toggle switch for normal operation. Defective back-up relay check for 24vac at relay coil. If no voltage is present...
53 troubleshooting gcco-pp / -pt cont’d no heat, manual mode probable cause corrective action defective back-up toggle switch confirm that toggle switch is in the “on” position. Check toggle switch for normal operation. Defective back-up relay check for 120vac at relay coil. If no voltage is present...
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 defective output on cpu board check for 24vac at jp2 (while oven is calling for he...
55 technical data transformer resistance transformer input primary secondary output 120/24 volt 120 volt 18.9 Ω 1 Ω 24 volt 120/12 volt 120 volt 154.1 Ω 1 Ω 12 volt 24/24 volt 24 volt 2.7 Ω 3.4 Ω 24 volt contactor resistance contactor coil 3 pole 24 volt coil 6 Ω 2 pole 24 volt coil (p & b) (pp & pt...
56 technical data cont’d gas valve gas valve coil 24 volt input pv 28 Ω mv 28 Ω specifactions btu’s w/c model ng lp gas connection electrical conn. (single pahce) weight 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, 7.1a 1000 l...
57 technical data cont’d probe resistance temp resistance volt drop temp resistance volt drop 70 ° 556 Ω 1.11 290 ° 881 Ω 1.76 80 ° 569 Ω 1.14 300 ° 897 Ω 1.79 90 ° 583 Ω 1.17 310 ° 914 Ω 1.83 100 ° 596 Ω 1.19 320 ° 931 Ω 1.86 110 ° 610 Ω 1.22 330 ° 948 Ω 1.90 120 ° 623 Ω 1.25 340 ° 965 Ω 1.93 130 °...
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 circu...
59 technical data cont’d gcco-c test point layout tp 2 tp 1 tp 3 tp 4 tp5 tp6 tp7.
60 technical data cont’d gcco-pp / -pt test point layout power yellow yellow yellow yellow yellow yellow gr e e n gr e e n gr e e n gr e e n gr e e n power or a n ge motor high red motor low bl u e steam gr e e n ecco / gcco lights gr e e n yellow yellow / red yellow brown brown purple plus power sw...
61 wireing diagram gcco-t.
62 wiring diagram gcco-ap.
63 wiring diagram gcco-sii.
64 wiring diagram gcco-c.
65 wiring diagram gcco-pp.
66 wiring diagram gcco-pt.
67 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 30303-16 thermostat safety 490 °f o...
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 switch temperature control 12 position 140-450 °f 30304-16 thermostat safety 490 °f open 30401-09 terminal strip 3 ...
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 thermostat safety 490 °f open 30401-09 terminal strip 3 p...
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 thermostat safety 4...
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 thermostat safety 490 °f open 30401-09 thermostat 450 °f oven 30402-27 terminal block 24 position quick disc...
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 thermostat safety 490 °f open 30401-09 thermostat 450 °f oven 30402-27 terminal block 24 position quick disc...
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