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Service Manual for the Lang Models

1. uc RELAY EEPROM m IBBON BROWN __ ___ YELLOW RED YELLOW TP YELLOW PURPLE PLUS YELLOW POWER SWITCH YELLOW ECCO rGCCO YELLOW PURPLE PLUS 2 POWER SWITCH YELLOW YELLOW DOOR SWITCH 46 _ REVISION BLOCK Q TERMINAL BLUCK ECN NO DESCRIPTION DR MFG ENG DATE REVISED amp REDRAWN SRC 12 15 97 GROUND LUG RES a Ae TERMINAL BLOCK 22 Li O C mu 2 5 12 5 Le C 23 L3 2 0 24 CONTACTOR Q Q POWER SWITCH X N 3 DOOR SWITCH EN HEATERS 5 2500 WATTS EACH 17 22 SINGLE PHASE CONNECTION 16 ME 4 V PILD LAMP 1 5 CONNECTOR 15 19 Le D Q9 8 METERS THERMOSTAT P pP AMPS _ W QTY TEM PART NUMBER DESCRIPTION MATERIAL 240V 3 PHASE SINGLE PHASE LANG MANUFACTURING 13 i Le 208 240V DR SRC DATE 12 15 97 TITLE WIRING DIAGRAM 0 0 3 1 2 5 3 10 4 12 9 202 26 9
2. REVISION BLOCK 287 RELAY REV EC DESCRIPTION DR NC o os B BACK UP HEA SWITCI udis HI SP MOTOR JP13 LO SP MOTOR JP14 OPT STEAM 21 RTD 4 JP35 DOOR Sw JP37 ON OFF Ba 29 pg i GP3 CHASSIS GROUND JPN PIG 6 PIT PIG P19 EJ v GP4 CHASSIS GROUND L Beds E El gadig JP41 RS2 32 CONNECTOR ols E gt a Ji Nen mm Y Y Y L 24 amp OVEN CONTROL ek CONTROL ji A AM Ste FRONT B amp DISPLAY FROM MAIN GROUND LUG TSTA CONTACTOR alg g n Els JUUR SWITCH 27 O O O O O O Sl p l D 09 0 0 0 O0 0 O B 0 0 0 0 0 0 U 24 POLE Rm TERMINAL BLOCK 2500W STEAM FRUM 2500W CONTROL VOLTS KW AMPS 2500W M HER Li L2 Le L3 L3 L1 TOTAL Le L3 1 PHASE 5 Wurde EH 480 25 25 31 81 602 602 674 975 Lo 00 rt vary I CONTACTOR SOLENOID BLE 070 E SERVICE CONNECTIONS THREE PHASE SINGLE PHASE MOTOR Y m Ar fe BLUE 4 9 13 5 4 6
3. STEAM REVISION BLOCK BACK UP BACKUR SABIE SWITCH RELAY REV NO DESCRIPTION DATE en MOVED BLUE AND WHITE WIRES DM cx 52 6 C XFMR WIRED FOR 208VOLTS f Cz TO CHANGE TO 840v gt DISSCUNNECT RED 208 LEAD _ 3 1 6G amp CONNECT BLUE 240 LEAD E BACK UP TU TERM BLDCK B 11 HEAT 0O swite 00 NUT CONNECT BOTH PI HI SP MOTOR E e JP13 LO SP MOTOR o JP14 OPT STEAM T el 21 RTD OF JP35 DOOR Sw JP37 DN DI S GP3 CHASSIS GROUND ccm mcs wg C e GP4 CHASSIS GROUND E 12724 2 9 8 Epod YYY TON 24 Os OVEN CONTROL ri elis CONTROL o oj d FRONT amp DISPLAY rad H FROM MAIN CONTACTOR alg E LC X gt 4 M9 6 SIE DOOR SWITCH JP41 NUT l 5 x NC ona U 24 POLE RED TERMINAL BLOCK 2500W STEAM 25004 1 VOLTS 5 seno L Oe MOTOR 20 C 12 13 L3 L1 TOTAL L1 le L3 1 PHASE 515 d 208 as 31 81 233 208 233 40 seen CONTROL 20 E 4 240 es 25 31 8 1 202 180 eoe 338 Al n 5 STE VALUE BEUE WHT WHT WHEN PRESENT SERVICE CONNECTIONS p MR THREE PHASE SINGLE PHASE 1 A at Le u 1 1 Sj DIETO
4. 220 EH 4 E 7 ZHRIAX431 V A 2 c Nc SwITCH 2 5 eee WI ato Jes ENERGY SWITCH AL 39 240 4 36 24 O AKI SWITCH NN c f sn ek 24 o C mI P THERMOSTAT b c af es o 0 T D gt s RTD SENSOR 5 5 3 0 o 4 2 a 2 5 S amp A en 2 E 3e i O 2 D WIRING DIAGRAM eL QTY ITEM PART NUMBER DESCRIPTION MATERIAL RANSFOR 0 A Jj Ej LANG MANUFACTURING x aye DR SRC DATE 10 6 97 TITLE AMPS ee EHS C 208 240 KW CK FJD DATE 10 208V 3 PHASE 240V 3 PHASE SINGLE PHASE RANGES Ur WITH BACKUP THERMOSTAT L1 L2 Less HESS UTAL L1 Le 58 L1 Lee L3 208V 240V DRAWING NUMBER REV N E euo 2 8 78 2241 191 37 5 dej a ort 61111 39 E 49
5. 51 208 240 WIRING DI Srem REVISION BLOCK 5 RELAY REV NO DESCRIPTION DR MFG ENG DATE NC ND 8 ADDED OPTIONAL MOTOR STUFF BDM 10 20 99 Oo 5 o5 L G OP E XFMR WIRED FOR 208VOLTS o Xo 8 TD CHANGE 240V PRU DISSCUNNECT RED 208 LEAD amp CONNECT BLUE 240 LEAD TO TERM BLOCK 8 HEA DO NOT CONNECT BOTH HI SP MOTOR JP13 LO SP MOTOR JP14 OPT STEAM JP21 RTD c o J DOOR SV CHASSIS GROUND c D GP4 CHASSIS GROUND a sr C JEAT EP TONITE EN 5 UUJ 4 T 5 5 L Slo ex 24 L HE 4 OVEN CONTROL HE EN CONTROL FRONT 5 amp DISPLAY EIS 5 TEE FROM MAIN Ele STAT CONTACTOR sE alz 4 gt alg DOOR SWITCH JP41 5 E 5 NC Se OO 3 O O O O O O
6. BLUE 4 BEN 1 4 2 5 3 6 1 3 5 2 4 6 RED gt RED PURPLE PLUS TERMINAI xu NE Lo Tm QTY ITEM PART NUMBER DESCRIPTION MATERIAL YA Um LANG MANUFACTURING en DR SRC DATE 2 24 98 TITLE HI LIMIT W D EH PP WITH 2 SPEED DISC STAT CK FJD DATE 3 19 98 ERANCES FROM MAIN MOTOR 208 240VAC CONTACTOR NOLES UNL ERWISE SP NEXT HIGHER ASSY SHEET DRAWING NUMBER REV DIMENSIONS ARE IN SCALE To Fit Lora 61111 147 A 50 EM REVISION BLOCK BACK UP RELAY REV ECN NO IPTION DR ENG DATE SWITCH REL 1 G G E NC NO 5 o Ca Go H Back uP 11 HEAT 4 UU HI SP MOTOR 0 4 2 JP13 LO SP MOTOR c is
7. 9 24 POLE RTD TERMINAL BLOCK 2500W STEAM FROM 25004 a CONTROL amp VOLTS KW M M sumi d 1 Line Le L3 13 11 11 PHASE olo 3 maine 208 25 25 81 233 40 2 ee D 1 240 25 25 81 20 2 338 ups eS woo MAIN lied KA steam valve BEBE WHEN PRESENT RED F do SERVICE CONNECTIONS THREE PHASE SINGLE PHASE 24 NC MOTOR 5 5 Al HI ul L2 u L2 1 1 4 1 4 2 5 3 6 2 4 6 BLUE Ja 2 2 9 Ap li E cA 3 3 PLATINUM TERMINAL BLOCK BLACK P QTY ITEM PART NUMBER DESCRIPTION MATERIAL i MAN T x HI LANG MANUFACTURING ON ga 0 Dm DE 272498 UU w D PT WITH 2 SPEED N F Bis CK DATE 9 TOLERANCES FROM MAIN jl MOTOR 208 240VAC L CONTACTOR AG oe 552 UNLESS OTHERWISE SPECIFIED NEXT HIGHER ASSY SHEET DRAWING NUMBER REV CONTACTOR jP MENSIONS ARE IN INCHES SCALE TO Fl aod 61111 148 B 52 STEAM BACK UP BACKUP
8. Service Manual for the Lang Models EHS AP EHS C EHS PP EHS PT amp EHS T 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 TABLE OF CONTI CHAPTER PAGE 1s TABLE OF CONTENTS inet lite 2 2 SE 2mm td nomtn n omm thon o emm s mtr 3 3 EQUIPMENT DESCRIPTION 5 4 INSTALLAT ION Mc 7 8 6 CONTROL PANEL 1 0640 40 9 PROGRAMMING TERMS 2 1 100 14 8 5 2 5 2 rte corel oec ose eain GU 15 9 GENERAL OPERATIODN itio oe Iob 24 TO CTYPIGCAESOPERATIN id dou deat ini deat dete Dd de 26 11 SEQUENCE OF 1 2 1 1 28 12 2 31 13 TECHNICAL DE ed 41 14 WIRING DIAGRAMS 0 210 1 47 15 PARTS LIST cedula c e o ie eee eats iet i ie oo utu ees 54 IMPORTANT READ FIRST IMPORTANT CAUTION THE UNIT IS EXTREMELY HEAVY FOR SAFE HANDLING INSTALLER Ise SHOULD OBTAIN HELP AS NEEDED OR EMPLOY APPROPRIATE MATERIALS HANDLING EQUIPMENT SUCH AS A FORKLIFT DOLLY OR PALLET JACK TO REMOVE THE UNIT FROM
9. m JP14 OPT STEAM Kis JPel RTD lt 2 4 8 JP35 DOOR SW ae SS JP37 ON OFF GP3 CHASSIS GROUND EEHSBSEDJOO d T GP4 CHASSIS GROUND EN 2 C EPRD JP41 RS232 CONNECTOR alls s kA eh Jul asse ce Y Y Y T i 24 SG gt OVEN CONTROL pel EN CONTROL Rd E FRONT amp DISPLAY 538 MAIN GROUND LUG 5 RUN CONTACTOR i z olg P41 DOOR SWITCH NU iere id EM O O O O O O Hora 45 O O O O O O O O O O O O v SS 2 2 gt SS 24 POLE RTD TERMINAL BLOCK E STEAM 250w CONTROL hn VOLTS KW AMPS v C MOTOR cee Li L2 L3 L1 TOTAL 1 Le L3 1 PHASE 2500 TN J Za 75 3 g Biva 3 TM MOTOR EH 480 25 21 81 6 08 6 02 6 74 979 T CONTROL 24 Low HX A 2 99 Spem a J HEN PRE Q SERVICE CONNECTIONS THREE PHASE SINGLE PHASE i c NO a Li Le ec 1 Le BLL 4 1 9 1 4 2 5 3 6 1 3 5 2 4 6 RED T E 2 ED Mb os bs PURPLE PLUS Q TERMINAL BLACK 2 d N Er M T7YTA QTY ITEM PART NUMBER DESCRIPTION MATERIAL A J LANG MANUFACTURING DR src DATE 11 9 00 TITLE HI LIMIT W D 480V EH PP DISC STA DE TE DAE TOLERANCES FROM ETS MOTOR 480VAC CONTACTOR SI SE SPECIFIED NEXT HIGHER ASSY SHEET DRAWING NUMBER REV N INCHES Lora 61111 168 A
10. ONO 2 SPEED 5 gt SWITCH Ch FROM MAIN SWITCH S M CONTACTOR 5 LA HIGH 2500 MaTOR m SWITCH Aes g gt 5 O G a a HIGH LIMIT TUAM a DISC STAT 1 2 2 3 QTY PART NUMBER DESCRIPTION MATERIAL 6 3 2 A IDAN 4 LANG MANUFACTURING TERMINAL BLOCK DR SRC DATE 7 3 96 TITLE ee W D CK FJD DATE 7 3 96 TOLERANCES FRACTIONS DECIMA x 05 208 240 i 015 SPECIFIED NEXT HIGHER ASSY SHEET DRAWING NUMBER REV INCHES FIT ort 61111 135 A 48 208 240 WIRING DI GROUND LUG REV ECN NO MG 9 E REMOVED SNUBBER SRC 5 98 OPTIONAL MOTOR FUSE T ee 225 3 PHASE 4 CAM 4 N E e uo 2 SSO p Lolo 5 a sale m FUSE MOTOR 3 D L3 CONTACTOR 40 SINGLE PHASE O EE SUNNE GTO _ 0 0 m gt N SNUBBER 2 EE OVERTEMP HEATERS Le 4 5 2500 CAPACITOR MOTOR i Z 50 C 4771 TERMINAL BLOCK 2B
11. RED 5 RED LA 3 PURPLE PLUS pos BLACK PART NUMBER DESCRIPTION MATERIAL IO LANG MANUFACTURING DR SRC DATE 11 9 00 TITLE HI LIMIT W D 480V EH PT DISC STAT CK FJD DATE TOLERANCES CTI DECIM FROM MAIN x MOTOR 480VAC CONTACTOR Ed UNLESS OTHERWISE 5 NEXT HIGHER ASSY SHEET DRAWING NUMBER REV DIMENSIONS ARE IN SCALE ioa 61111 169 A 53 EHS T PARTS LIS DESCRIPTION PART NO Element EHS Oven 208 Volt 5000 Watts 11090 23 Element EHS Oven 240 Volt 5000 Watts 11090 24 Stacking Pins 20108 01 Motor 1 3 HP 115 208 240 Volt 30200 12 Switch Toggle On Off 30303 06 Thermostat Safety 490 F Open 60102 102 Thermostat 450 F Oven 30402 27 Terminal Block 3 Pole 30500 09 Contactor 3 Pole 208 240 VAC 30700 05 Contactor 2 Pole 208 240 VAC 30701 03 Timer Mechanical Long Ring 30801 01 Fuse 15 Amp 30900 10 Fuse Holder 15 Amp 30901 08 Pilot Light 208 240V 6 Lead Black Body 31601 01 Door Handle 11 1 2 Long Black T Style 50800 12 Complete Door Assembly 51100 53 Baffle 60101 621 Door Magnet 60102 147 Top Panel 60102 136 Rear Panel 60102 1361 Right Hand Panel 60102 1364 Switch Plunger 60102 40 Switch Plunger Oven Door After V 27971 Except Reversible door 30301 11 Switch Micro Convection Oven Door Before V 27971 51100 18 Door Seal 60102 97 Hinge Bracket Assembly Upper and Lower 50313 030 Knob Manual Timer 70701 09 Knob Thermostat 450 F Oven 70701 16 Window Assembly Oven
12. Step 8 SELECT PRODUCT 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 SELECT PRODUCT NAME APPETIZER A USE Av KEYS TO SELECT replaced with the new product name or blanks when the product is shorter than APPETIZER 2244 APPETIZER EXAMPLE APPLE replaces only APPET IZER A must be replace by blanks A blank can ACCEPT be found before A or after 9 when ENTER scrolling ACTION DISPLAY Step 9 SELECT PRODUCT TEMPERATURE Press the 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 EXAMPLE 320 Press three times for a 3 then select ENTER to advance the cursor Press two times for a 2 then select ENTER to advance the cursor Since 0 is already displayed just select ENTER to advance to the next screen SELECT PRODUCT TEMPERATURE 7 100 USE Av KEYS TO SELECT APPLE TIER 1 4 ACCEPT 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
13. COMBUSTIBLE MATERIALS CAUTION KEEP FLOOR IN FRONT OF EQUIPMENT CLEAN AND DRY IF SPILLS ELTE 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 ELECTRICAL CONNECTIONS ETC MOST CLEANERS ARE HARMFUL TO THE SKIN EYES MUCOUS MEMBRANES AND CLOTHING PRECAUTIONS SHOULD BE TAKEN TO WEAR RUBBER GLOVES GOGGLES OR FACE SHIELD AND PROTECTIVE CLOTHING CAREFULLY READ THE WARNING AND FOLLOW THE DIRECTIONS ON THE LABEL OF THE CLEANER TO BE USED NOTICE Never leave a chlorine sanitizer in contact with stainless steel surfaces longer than 10 minutes Longer contact can cause corrosion CAUTION gt IMPORTANT READ FIRST IMPORTANT NOTICE WARNING 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 nearest you BOTH HIGH AND LOW VOLTAGES ARE PRESENT INSIDE THIS APPLIANCE WHEN THE UNIT IS PLUGGED WIRED INTO A LIVE RECEPTACLE BEFORE REPLACING ANY PARTS DISCONNECT THE UNIT FROM THE ELECTRIC POWER SUPPLY NOTICE CAUTION If an item on the list is followed by an asterisk the work should be done by a factory authorized service representative USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY LANG OR THEIR AUTHORIZED DISTRIBUTO
14. Door 71301 04 Blower Wheel 71500 06 Rack 50200 34 Rack Slide 50200 83 54 EHS AP PARTS DESCRIPTION PART NO Element EHS Oven 208 Volt 7500 Watts 11090 20 Element EHS Oven 240 Volt 7500 Watts 11090 21 Element EHS Oven 480 Volt 7500 Watts 11090 22 Stacking Pins 20108 01 Motor 1 3 HP 480 Volt 2 Speed 30200 16 Motor 1 3 HP 208 240 Volt 2 Speed 30200 17 Switch Toggle On Off 30303 06 Switch 12 Position 30304 16 Thermostat Safety 490 F Open 60102 102 Terminal Block 3 Pole 30501 02 Contactor 3 Pole 24 VAC 30700 06 Contactor 2 Pole 24 VAC 30701 05 Timer Electric 30800 05 Buzzer Electric Timer 30802 02 Transformer 480 240 VAC 31400 04 Transformer 120 208 240 24 VAC 31400 07 Pilot Light 31601 07 Circuit Board Temperature Control 40101 19 Probe Temperature Sensor 41100 12 Oven Rack 50200 34 Oven Rack Slide 50200 83 Door Handle 11 1 2 Long Black T Style 50800 12 Complete Door Assembly 51100 53 Baffle 60101 621 Door Magnet 60102 147 Top Panel 60102 136 Rear Panel 60102 1361 Right Hand Panel 60102 1364 Switch Plunger 60102 40 Switch Plunger Oven Door After V 27971 Except Reversible door 30301 11 Switch Micro Convection Oven Door Before V 27971 51100 18 Door Seal 60102 97 Panel Label 60301 25 Hinge Bracket Assembly Upper and Lower 50313 030 Knob Time Temperature Control 70701 28 Window Assembly Oven Door 71301 04 Blower Wheel 71500 06 55 EHS C PARTS DESCRIPTION PART
15. Failure to do so will result in damage to the Display board and CPU 37 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 208 240VAC at 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 208 240VAC 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 208 240VAC across 1 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 gt Board is operating correctly If voltage is present gt Replace CPU 38 Defective back up toggle gt Confirm that toggle switch is in the ON position switch gt Ch
16. THE SKID AND MOVE IT TO THE PLACE OF INSTALLATION CAUTION _ STAND COUNTER OR OTHER DEVICE ON WHICH 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 A DANGER THIS APPLIANCE MUST BE GROUNDED AT THE TERMINAL PROVIDED BANGER ae FAILURE TO GROUND THE APPLIANCE COULD RESULT IN HIGH ELECTROCUTION AND DEATH VOLTAGE WARNING INSTALLATION OF THE UNIT MUST BE DONE BY PERSONNEL T QUALIFIED TO WORK WITH ELECTRICITY AND PLUMBING IMPROPER INSTALLATION CAN CAUSE INJURY TO PERSONNEL AND OR DAMAGE TO EQUIPMENT UNIT MUST BE INSTALLED IN ACCORDANCE WITH ALL APPLICABLE CODES NOTICE The data plate is on the back side of the oven above the power cord The oven voltage wattage serial number wire size and clearance 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 NOTICE During the first few hours of operation you may notice a small amount of smoke coming from 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
17. TIME will automatically advance to the next display HR MIN SEC NOX 1 XXXF CO Enter the cooking time and then press E to advance to ENTER COOKING CURVE the next screen 0 TO 100 NOX T1 XXXF CXX F XX Enter the desired cooking curve Refer to sections 6 3 and 6 7 for more detail ENTER FAN SPEED 1 HI 2 LOW NOX T1 XXXF CXX F XX Select Fan speed Hi 1700 rpm Low 1400 ENTER FAN PULSE RATE 1 TO 100 NOX T1 XXXF CXX XX2O0CXX Select Fan Pulse rate 0 to 100 O off unless calling for heat 100 on at all time NOTE Any number between 0 100 means 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 1 XXXF CXX XX XX XX F XX If your press 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 PROGRAM PRODUCTS D NEXT MENU 17 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 lt OVEN lt TIME DATE PROGRAM 4 TME I DATE PROGRAM gt TIME DATE TEMP STATUS 12 00 01 01 01 325 STANDBY ACTION DISPLAY DISPLAY PRODUCT lt TIMER ONLY Step 3 S
18. back up thermostat Normally in HIGH for 11 kW heats LOW WILL PROVIDE 8 25 kW heat Not provided on Steam convection ovens Auto Bypass switch e Energy switch LINE AMPERAGE WATTAGE AND PROPER PHASING Nominal Amps Per Line Single Phase KW per Three Phase MODEL 6 connection 208 Volt 240 Volt 208 V 240 V L1 L2 L3 L1 L2 L3 EHS 7 8 23 3 20 8 233 20 2 18 20 2 3869 33 8 PHASING THREE PHASE SINGLE PHASE L1 L2 L3 L1 1 4 2 5 3 6 1 3 5 2 4 6 EHS 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 42 PROBE RESISTANCE TEMP RESISTANCE VOLT DROP TEMP RESISTANCE VOLT DROP VON VV VV VV VV VV VV VV VV Vv vy VV VV VV ON ON ON ON ON ON ON ON VV VV WV 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 43 EHS 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 connec
19. five shelves are required space evenly in oven See page 27 for more detail UNLOADING gt Itis 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 24 GENERAL CON i THREE PAN FOUR Pan A 25 EHS 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 EHS 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 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 EHS C TYPICAL OPERATION SEQUENCE Turn power switch to ON Control panel comes on display says 88888 and then EntEr motor starts Press a product button Display says Preheat oven begins to heat to the programmed temperature Beep
20. 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 gut bet LL Lut Enter the desired cooking time hours minutes seconds rui 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 Prad When the programs have been completely entered press the R C button to save and exit the programming cycle EntEr 15 EHS 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 BBBBB 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 JGRAMMING EHS C CON 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 tim
21. 00 12 Complete Door Assembly 51100 53 Baffle 60101 621 Door Magnet 60102 147 Top Panel 60102 136 Rear Panel 60102 1361 Right Hand Panel 60102 1364 Switch Plunger 60102 40 Switch Plunger Oven Door After V 27971 Except Reversible door 30301 11 Switch Micro Convection Oven Door Before V 27971 51100 18 Door Seal 60102 97 Panel Label Purple Plus 60101 7661 Hinge Bracket Assembly 50313 030 Knob Thermostat 450 F Oven 70701 28 Window Assembly Oven Door 71301 04 Blower Wheel 71500 06 Wiring Harness Element EH 550 Wiring Harness Power Switch EH 554 Wiring Harness High Voltage Control EH 551 Wiring Harness Low Voltage Control EH 553 57 EHS PT PARTS LI DESCRIPTION PART NO Element EHS Oven 208 Volt 7500 Watts 11090 20 Element EHS Oven 240 Volt 7500 Watts 11090 21 Element EHS Oven 480 Volt 7500 Watts 11090 22 Stacking Pins 20108 01 Motor 1 3 HP 480 Volt 2 Speed 30200 16 Motor 1 3 HP 208 240 Volt 2 Speed 30200 17 Switch Toggle On Off 30303 06 Thermostat Safety 490 F Open 60102 102 Thermostat 450 F Oven 30402 27 Terminal Block 3 Pole 30501 02 Terminal Block 24 Position Quick Disconnect 30503 01 Relay 240 VAC 30600 02 Contactor 3 Pole 24 VAC Heat 30700 06 Contactor 2 Pole 24 VAC Motor 30701 05 Cable Ribbon Assembly 31110 13 Transformer 480 240 VAC 31400 04 Transformer 240 24 VAC 31400 10 Transformer 240 12 VAC 31400 26 Circuit Board Display 40102 25 Circuit Board Microprocessor 40102 26 Probe Temperat
22. 00 53 Baffle 60101 621 Door Magnet 60102 147 Top Panel 60102 136 Rear Panel 60102 1361 Right Hand Panel 60102 1364 Switch Plunger 60102 40 Switch Plunger Oven Door After V 27971 Except Reversible door 30301 11 Switch Micro Convection Oven Door Before V 27971 51100 18 Door Seal 60102 97 Panel Label Purple 60301 42 Panel Label Braum s 60301 81 Hinge Bracket Assembly Upper and Lower 5031 3 030 Knob Thermostat 450 F Oven 70701 19 Window Assembly Oven Door 71301 04 Blower Wheel 71500 06 Rack 50200 34 Rack Slide 50200 83 56 EHS PP PARTS LI DESCRIPTION PART NO Element EHS Oven 208 Volt 7500 Watts 11090 20 Element EHS Oven 240 Volt 7500 Watts 11090 21 Element EHS Oven 480 Volt 7500 Watts 11090 22 Stacking Pins 20108 01 Motor 1 3 HP 480 Volt 2 Speed 30200 16 Motor 1 3 HP 208 240 Volt 2 Speed 30200 17 Switch Toggle On Off 30303 06 Thermostat Safety 490 F Open 60102 102 Thermostat 450 F Oven 30402 27 Terminal Block 3 Pole 30500 09 Terminal Block 24 Position Quick Disconnect 30503 01 Relay 240 VAC 30600 02 Contactor 3 Pole 24 VAC Heat 30700 06 Contactor 2 Pole 24 VAC Motor 30701 05 Cable Ribbon Assembly 31110 13 Transformer 480 240 VAC 31400 04 Transformer 240 24 VAC 31400 10 Transformer 240 12 VAC 31400 26 Circuit Board Display 40102 24 Circuit Board Microprocessor 40102 26 Probe Temperature Sensor 41100 12 Oven Rack 50200 34 Oven Rack Slide 50200 67 Door Handle 11 1 2 Long Black T Style 508
23. 11 AlphaNumeric Display Product Select Button Press to select desired product Manual Program Button Use when product being cooked is for one time only POWER Man Prog gt 6 7 B _ 8 9 D 0 E 12 Power switch Shelf Select Button Press to select shelf which product will be placed Read Clear Button Used to read programs clear programs and to access program menu ROL PANEL LAYOUT Function keys Keys are active when a program p option is displayed on 5 display 4 lpha Numeric Display Cancel button When scrolling through menu s this will allow you to back up to the previous menu In program mode this will Arrow down button allow you to advance to the Allows you to scroll next step unum down EDS Power switch X A A Cancel Up Down On Off Arrow up button Allows you to scroll up PLATIMUM 13 Control Panel Buttons 1 0 A E Man Prog READ CLEAR Temp Product Buttons These are the buttons where the product programs are stored Pressing a Product Button will heat the oven to the programmed temperature Shelf Buttons The control is capable of timing each shelf individually Pressing a Product Button then a Shelf Button will start the countdown timer The MANUAL PROGRAM button allows the operator to enter a tempo
24. 23 3 DATE TOLERANCES EHS T 208 240V 5 3 KW SHEET DRAWING NUMBER REV ioi 61111 24 NEXT HIGHER ASS E IN INCHES 0 FIT REVISION BLOCK REV ECN NO DESCRIPTION DR MFG ENG DATE ADDED HIGH LIMIT DISC STAT SRC 11 7 97 CONTRO VOLTS AMPS POWER Q SWITCH Li te Le L3 L3 L1 TOTAL Li Le L3 1PH 208 25 es 31 81 233 208 38 9 EH 240 25 es 34 81 180 338 SERVICE CONNECTIONS 10 THREE PHASE SINGLE PHASE 9 Le L3 ul Le _ allA 1 4 8 5 3 6 1 3 5 2 4 6 BIO 7 2 gd X W li N alld TAP IEAT LIGHT GROUND LUG position 3 S 24VAC SWITCH 2 SC 240 ug 4 y 310 SANT G HEAT ry E O O O O A PULSE MODE FROM O O O 0 iC LIGH CONTROL 0 1 O O O O BAVAC ooo 2 2 C RSS 12 POLE RTD A aE FROM MAIN CONTACTOR PE BT O E ky DOOR SWITCH BLUE au conta TER NC 2500w
25. 24 pin Terminal block 24 VAC across D and coil of Motor relay Through door switch 24 VAC across D and of Heat contactor Through door switch and high limit thermostat 24 VAC across D and Common terminals of Back up relay 240 12 volt transformer energized Back up toggle switch Off 24 VAC across D and TP4 5 and TP6 12 volts to TP1 on microprocessor 24 VAC across coil of motor contactor Motor contactor closes 240 208 VAC across NO Normally open contacts of Motor relay Motor starts 24 VAC across coil of Heat contactor Heat contactor closes 208 240 volts to elements Oven heats Back up toggle switch Off 208 240 VAC across coil of Back up relay Back up relay closes 24 VAC across and Back up Thermostat With door switch energized 24 VAC across coil of Motor relay Motor contactor closes 240 208 VAC across NO Normally open contacts of Motor relay Motor starts Temperature set on back up thermostat 24 VAC across D and each terminal of back up thermostat 24 VAC across coil of Heat contactor Heat contactor closes 208 240 volts to elements 29 Oven plugged in 208 240 VAC across any A and B terminal on the terminal block 208 240 VAC to Control transformer 208 240VAC 24 12 VAC and Component transformer 240VAC 24 Transformers energize 24 VAC to any C and D terminal on the terminal block 24 12 VAC to Circuit Bo
26. C is measured Turn oven off and gt Check coil for 7 2 KQ gt Replace as necessary If 24 VAC is not measured gt Verify that manual override switch is in off position Check manual override switch for normal operation Check wires for any shorts gt gt Defective control transformer gt Check transformer for normal operation 12 VAC gt Check primary coil for 208 240 VAC and 630 Check secondary coil for no less than 10 5 VAC and 1 If voltage is measured on primary gt Check for voltage on secondary gt Replace transformer If voltage is not measured on primary gt Check wires for any shorts Defective rectifier 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 33 NO FAN Manual Mode
27. IME 00 45 00 COOKING CURVE 80 ACCEPT lt ENTER 21 ACTION DISPLAY Step 13 SELECT PULSE RATE Press A or v to select numbers select ENTER to move the cursor to the next space 100 is the default If this okay select ENTER three times or ACCEPT once to advance to the next screen EXAMPLE 80 Press the once 0 Select ENTER once to advance the cursor one space then press A eight times for a 8 Select ENTER to advance the cursor Since 0 is the next number select ENTER to advance to the next screen SELECT PULE RATE 100 USE Av KEYS TO SELECT d APPLE TIER 1 TEMP 320F FAN HI COOKING CURVE TIME 00 45 00 80 ACCEPT 4 ENTER ACTION DISPLAY Step 14 CORRECT The cursor automatically appears on YES The computer is asking if the program displayed is correct If any part of that program is incorrect press or v till the cursor is on NO Select ENTER or ACCEPT This will return you to step 7 Selecting YES will advance the sceen NO corrects D USE Av KEYS TO SELECT d APPLE TIER 1 TEMP 320F FAN HI COOKING CURVE TIME RATE 80 00 45 00 100 4 ACCEPT 4 ENTER 22 ACTION DISPLAY Step 15 CONTINUE TO NEXT TIER The cursor CONTINUE TO NEXT TIER NO automatically appears on NO Select YES NO EN
28. NO Element EHS Oven 208 Volt 7500 Watts 11090 20 Element EHS Oven 240 Volt 7500 Watts 11090 21 Element EHS Oven 480 Volt 7500 Watts 11090 22 Stacking Pins 20108 01 Motor 1 3 HP 480 Volt 30200 03 Motor 1 3 HP 115 208 240 Volt 30200 12 Switch Toggle On Off 30303 06 Switch Toggle Spring Return 30303 16 Thermostat Safety 490 F Open 60102 102 Thermostat 450 F Oven 30402 27 Terminal Block 3 Pole After D 70027 30500 09 Terminal Block 24 Position Quick Disconnect After D 70027 30503 01 Relay 240 VAC 30600 02 Contactor 3 Pole 24 VAC 30700 06 Contactor 2 Pole 208 240 VAC 30701 03 Cable Ribbon Assembly After D 70027 31110 01 Transformer 480 240 VAC 31400 04 Transformer 120 208 240 24 VAC 31400 07 Transformer 240 12 VAC 31400 26 Circuit Board Assembly Buzzer After D 70027 40102 10 Circuit Board Front Panel After D 70027 40102 20 Circuit Board Microprocessor After D 70027 40102 44 Circuit Board Upgrade Kit Before D 70027 60101 53 Snubber Low Voltage On Coil 3 Pole Contactor 40705 02 Snubber Hi Voltage Contactor Circuit Feed 208 240V 40705 04 Snubber Hi Voltage Across Poles 3 Pole Contact 208 240V 40705 05 Snubber Low Voltage 24 Pole Terminal Block 480V 40705 08 Snubber Hi Voltage 24 Pole Terminal Block 480V 40705 09 Suppressor Low Voltage 24 Pole Terminal Block 40705 10 Suppressor Hi Voltage 24 Pole Terminal Block 40705 11 Probe Temperature Sensor 41100 12 Door Handle 11 1 2 Long Black T Style 50800 12 Complete Door Assembly 511
29. NO HEAT Computer Mode PROBABLE CAUSE CORRECTIVE ACTION No 24 VAC on Interface board gt Check for 24 VAC at TP4 to ground If 24 VAC is not measured gt Check for 24 VAC at NC contacts on back up relay If 24 VAC is measured gt Check for 24 VAC at TP6 gt Replace Interface board if defective 35 DISPLAY LOCKS UP PROBABLE CAUSE CORRECTIVE ACTION Help in display 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 88888 stuck in display gt Check for stuck button by pressing any button If computer beeps or chirps gt Check control panel transformer 12 VAC for proper operation gt Check TP1 for at least 10 5 VAC gt Check TP2 for at least 4 99 VDC gt Check TP3 for at least 4 97 VDC If computer does not beep or chirp gt Check each button for movement gt Check that panel label has not been damaged in any way gt Replace button if defective gt Replace panel label Display has shelf A gt Read Programming Codes 36 EHS PP To help troubleshoot the oven you should perform the following Manual Override
30. PROBABLE CAUSE CORRECTIVE ACTION Defective 240 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 gt Check primary coil for 77 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 240 VAC on relay coil If 240 VAC is measured Turn unit off and gt Check back up relay coil for 7 2 K gt Replace if defective If 240 VAC is not measured gt Check back up switch SPDT for normal operation gt Replace if defective Motor contactor not energized gt Check for 24 VAC at contactor or relay coil 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 208 240 VAC across terminals of contactor pu 1f 208 240 VAC is not measured gt Check connection to main contactor heat contactor gt Check circuit breaker If 208 240 VAC is measured gt Check across NO contacts Should have 208 240 VAC gt Replace if defective NO MOTOR COMPUTER MODE PROBABLE CAUSE CORRECTIVE ACTION No 24 VAC on Interface board gt Check f
31. RS CAN CAUSE BODILY INJURY TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT AND WILL VOID ALL WARRANTIES EQUIPMENT DESCRIP Lang Model EHS Electric Half Size Convention Oven EXTERIOR e The oven exterior dimensions 30 76 2 cm Wide 25 63 5 cm High 26 5 67 31 cm Deep The Top Front Back and Sides are constructed of stainless steel with an aluminized bottom e oven door comes standard with a window e door handle is constructed of Polycarbinate e The oven cavity is insulated with high temperature insulation for efficiency and reduced heat loss INTERIOR e The oven cavity dimensions 15 38 1 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 e The interior of the oven is constructed of stainless steel OPERATION e EHS 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 EHS is available either with the Lang Mfg Accu Temp EHS T controls Accu Plus EHS AP controls Purple Computer EHS C controls Purple Plus Computer EHS PP controls and Platinum Computer EHS PT controls which include EHS T gt Easy to use manual control knobs Pulse and two speed fan e EHS AP gt Easy to use manual control knobs gt Pulse and two speed fan Solid State temperature sensing and c
32. Select ENTER twice to advance from hours to minutes then press A four times for a 4 then select ENTER to advance the cursor Then press A five times for a 5 then select ENTER to advance the cursor Since 0 is the next two numbers simply select ENTER again twice to advance the cursor SELECT TIER COOK TIME 00 45 00 USE Av KEYS TO SELECT APPLE TIER 1 TEMP 320F 4 ACCEPT lt ENTER 20 ACTION DISPLAY Step 11 SELECT COOKING CURVE Press A or Y to select numbers select ENTER to move the cursor to the next space Cooking curve may be any number between 0 and 100 EXAMPLE 80 Select ENTER once to advance COOKING D 000 USE Av KEYS TO SELECT the cursor one space then press A eight ui 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 4 ACCEPT lt 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 or v to move the cursor to low Once low is selected select ENTER or ACCEPT to move to the next screen APPLE TIER 1 TEMP 320F T
33. TER or ACCEPT to end programming or move the cursor with the A or v 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 E APPLE TIER 1 TEMP 320F TIME 00 45 00 FAN HI RATE 100 COOKING CURVE 80 ACCEPT ENTER ACTION DISPLAY Step 16 After programming the last tier select NO lt 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 three times to advance lt DELETE PRODUCT Screen to the boot up screen 4 EDIT PRODUCT ACTION DISPLAY Step 17 You may now preheat the oven for any products you have programmed Step 18 Select lt Run oven lt OVEN DATE PROGRAM DATE TEMP STATUS 12 00 01 01 01 325 STANDBY 23 OPERATIONS gt 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 gt Toconvert 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 gt The lower the temperature the more even the bake gt Check the product halfw
34. anel label buttons and confirm that none of the domes are collapsed If domes are collapsed Replace panel label Intermittently over heats or under cooks Check probe for proper resistance gt Check ribbon connection for good connection Check probe for good connection 40 TECHNICAL DAT ELEMENT RESISTANCE gt 208 Volt 170 gt 240 Volt 230 gt 480 Volt 600 TRANSFORMER RESISTANCE gt TRANSFORMER Input Primary Secondary Output gt 208 24 Volt 208 240 Volt 770 10 24 Volt gt 240 12 Volt 208 240 Volt 6300 10 12 Volt gt 208 240 24 12 208 240 Volt 208V 240V 12V 24V 24 12 Volts 640 750 60 10 CONTACTOR RESISTANCE gt CONTACTOR Coil gt 3 Pole 24 Volt coil 60 gt 2 Pole 24 Volt coil P amp B PP amp motor 350 RELAY RESISTANCE gt RELAY Coil gt 240 VAC 7 2 KQ OVER TEMP THERMOSTAT gt OVER TEMP gt Wires 21 and 17 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 gt Blower fan will rotate clockwise and should have a 5 8 gap between it and the back wall of the can 41 TECHNICAL DATA COP AUTO BYPASS SWITCH The Auto Bypass and Energy switch are located below the controls behind a pull down access panel Normally in OFF The ON position will interrupt power to the computer and allow use of the
35. ard JP40 24 VAC to Circuit Board outputs JP11 JP13 Power Switched turned to ON Display comes on Product selected 24 VAC across motor output JP12 and D 24 VAC across motor HI relay coil Motor relay closes 208 240 V AC to motor Motor Starts 24 VAC across heat output JP11 and D 24 VAC across heat contactor through over temperature thermostat Heat contactor closes 208 240 VAC to elements Back up toggle switch to 208 240 VAC across coil of back up relay coil Back up relay energizes 24 VAC to motor relay Motor relay energizes 208 240 VAC to motor Motor Starts 24 VAC to thermostat Temperature set on thermostat 24 VAC to heat contactor Contactor energizes 208 240 VAC to elements 30 TROUBLESHOOTING EH HINT Confirm that all Circuit Breakers are in the ON position NO MOTOR PROBABLE CAUSE CORRECTIVE ACTION Defective Fan Switch gt Verify that Fan switch is in ON position In pulse position motor will only cycle when oven calls for heat Defective Transformer Transformer gt Check transformer for normal gt Check transformer for normal operation E Motor Relay SS E Check motor relay for normal operation 24V AC 35 Q Defective Door Switch gt Check door switch for normal operation gt Check motor for normal operation P1 T9 low P1 T7 T4 high NO HEAT PROBABLE CAUSE CORRECTIVE ACTION Defective Elements Check that elements ar
36. ay through the baking cycle Look through the door windows Opening the oven door is not recommended gt 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 gt If products are pulling to the edge of pans or spilling the oven is not leveled or the pans are warped Correct as necessary gt 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 gt Most baking should be done with the vent closed Open the vent only with high moisture products to avoid seepage around the front of the door gt Always weigh your product This will give you a more consistent size color and quality gt Center the pan in the oven The better the air flow around the product the better the bake gt 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 gt Place product as close to oven as practical Open oven doors and load quickly but carefully gt 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
37. e getting power Confirm that Elements are working correctly See Technical Data Defective Transformer Check transformer for normal operation Replace if necessary Defective Heat Contactor Confirm that Contactor is getting correct voltage Confirm that Contactor is operating properly 24VAC 60 Defective Thermostat 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 gt Check thermostat for continuity gt Replace as necessary 31 HINT Confirm that all Circuit Breakers are in the ON position NO MOTOR PROBABLE CAUSE CORRECTIVE ACTION Defective Fan Switch gt Verify that Fan switch is in ON position In pulse position motor will only cycle when oven calls for heat Defective Transformer Transformer gt Check transformer for normal gt Check transformer for normal operation E Motor Relay SS E Check motor relay for normal operation 24V AC 35 Q Defective Door Switch gt Check door switch for normal operation gt Check motor for normal operation P1 T9 low P1 T7 T4 high NO HEAT PROBABLE CAUSE CORRECTIVE ACTION Defective Elements gt Check that elements are getting power gt Confirm that Elements are working correctly See Technical Data Defective Transformer gt Check transformer for normal operation gt Replace if n
38. ecessary Defective Probe gt Confirm that probe has proper resistance for the correct temp See Technical Data Defective Heat Contactor gt Confirm that Contactor is getting correct voltage gt Confirm that Contactor is operating properly 24VAC 60 Defective Thermostat 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 gt Check over temperature thermostat for proper operation gt Check door switch for normal operation 32 TROUBLESHOOTING gt To help troubleshoot the oven you should perform the following Manual Override test gt Open drop down door located on the lower right side directly below front panel gt Turn back up toggle on off switch to on position gt Turn main power switch to on position gt Check oven for normal operation gt If fan comes on and unit heats up refer to section 4 1 NO DISPLAY gt If fan does not come on refer to section 4 2 NO DISPLAY PROBABLE CAUSE CORRECTIVE ACTION Defective power switch gt Check power switch for normal operation Replace as necessary Defective back up relay gt Check relay for normal operation gt Check for 24 VAC If 24 VA
39. eck toggle switch for normal operation Defective back up relay gt Check for 208 240VAC at relay coil If no voltage is present gt Confirm that points are making If voltage is present Replace relay Defective component Confirm that 208 240V AC is feeding primary coil Confirm that 24V AC is at secondary coil Defective Thermostat Confirm that thermostat has 24VAC 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 Defective heat contactor gt Check for 24VAC at relay coil If no voltage is present gt Confirm that points are making If voltage is present gt Replace contactor Defective elements gt Check for 208 240VAC across elements If no voltage is present gt Confirm that wires have continuity If voltage is present gt Replace elements 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 24VAC at JP11 while oven is calling for heat board If no voltage is present gt Board is operating correctly If voltage is present gt Replace CPU BLESHOOTING EHS PP PT ANOMALIES Display will intermittently gt Check ribbon cable for good connections blank out gt Check p
40. elect lt SET TIME DATE lt PROGRAM COMPUTER X PROGRAM COMPUTER gt TIME DATE TEMP STATUS 12 00 01 01 01 325 PROGRAM ACTION DISPLAY Step 4 Using the and arrows enter access ENTER ACCESS CODE NU code ABCDEF A Press A or to scroll through letters and numbers then select ENTER to move the cursor to the right USE Av KEYS TO SELECT THEN PRESS ENTER EXAMPLE Press A once for an A then press ENTER Press twice for a then select ENTER Continue through The screen will then automatically advance once access code has been entered correctly lt ENTER PRESS CANCEL TO QUIT 18 ACTION DISPLAY Step 5 Select CX PROGRAM PRODUCTS gt lt PROGRAM PRODUCTS X EDIT READY ZONE EDIT ACCESS CODE ENABLE MANUAL PRODUCT lt CONFIGURE TIME OF DAY ACTION DISPLAY Step 6 Select lt CREATE NEW EDIT PRODUCT lt CREATE NEW PRODUCT DELETE PRODUCT 4 EDIT PRODUCT ACTION DISPLAY Step 7 SELECT PRODUCT ICON is the first Co 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 774 APPETIZER A lt ENTER 19 ROGRAMMING EHS PT CON ACTION DISPLAY
41. emperature to be set in 50 F increments from 100 F TROL PANEL LAYOUT E Timer Control Electronic one hour timer with continuous ON 1 Power switch OFF PULSE FAN HI SPEED Dual speed switch 4 Toggles the fan between high and low speed FAN LOW SPEED TEMP ae TIME beeper Pulse fan switch Pulse fan ROL PANEL LAYOUT EH setting will only turn the fan on when the oven is calling for heat Solid State Temperature Control Allows temperature to be set in _ gt 25 F increments from 140 F switch OFF PULSE FAN HI SPEED Dual speed switch 4 Toggles the fan between high and low speed FAN LOW SPEED TEMP TIME ee Timer Control Electronic one 04 hour timer with continuous beeper P 10 On a Power switch Off LED Display gt 1 6 Shelf Select Button Press Product Select Button to select shelf which Press to select desired K 9 4 product will be placed product gt 2 7 B 3 8 4 9 D 5 0 E Read Clear Button Used Nds E to read programs clear Clear programs and to access program menu Manual Program Button Use when product being p 5 cooked is for one time only
42. er 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 16 PRESS Shelf R C R C Shelf 4 8 4 8 4 8 0 9 0 9 0 9 8 7 8 7 8 7 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 C B C B LE 2 3 R C 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 PROGRAM PRODUCTS D NEXT MENU Select 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 F NOX T1 XXXF Enter a desired cooking baking temperature The screen ENTER COOKING
43. er sounds briefly Display says Open the oven doors and load the product Close the Beeper sounds briefly 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 rEAdY 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 26 S YPICAL OPERATION EHS 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 but
44. nd D common of 24 pin Terminal block 24 VAC across coil of Motor relay Through door switch 24 VAC across D and of Heat contactor Through door switch and high limit thermostat 24 VAC across D and terminal on thermostat Motor contactor closes Motor starts 24 VAC across coil of Heat contactor Heat contactor closes 208 240 volts to elements Oven heats JENCE OF OPERATION Power switch turned on 240 208 VAC across Common terminals on power switch and B terminal of 12 pin Terminal block 240 208 VAC to Common terminals of Motor relay 240 24 volt transformer energized 24 VAC across C and D common of 24 pin Terminal block 24 VAC across coil of Motor relay Through door switch 24 VAC across D and of Heat contactor Through door switch and high limit thermostat 24 VAC across D and Heat output on board Motor contactor closes Motor starts 24 VAC across coil of Heat contactor Heat contactor closes 208 240 volts to elements Oven heats 28 Power switch turned on 240 208 VAC across Common terminals on power switch and A terminal of 24 pin Terminal block 240 208 VAC across any A and B terminal of 24 pin Terminal block 240 208 VAC to Common terminals of Motor relay 240 208 VAC across common terminals of Back up toggle switch 120 VAC to coil of Back up relay 240 24 volt transformer energized 24 VAC across C and D common of
45. nstructions as the 28 inch legs To install the 4 inch legs place some cardboard on the floor and gently tip the oven onto its back Fasten the four 4 inch legs into the threaded holes provided on the bottom of the convection oven Gently lift the oven onto the legs 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 pins into the front leg holes of the top oven Lift the top oven and gently set on top of the lower oven so that the studs nest into the holes of the lower oven START UPS EHS C EHS PP EHS PT Convection Oven Start Up 1 Verify connections at plug and terminal block 2 Incoming Volt Single Phase 11 12 Three Phase 11 12 L2 L3 L3 L1 3 Amp draw L1 L2 L3 4 Motor amp draw 5 Are programs correct Yes 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 oven temperature 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 t
46. ontinuously Fan Off Fan 0 leaves the fan off until heat is 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 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 located 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 14 PROGRAMMING ROGRAMMING EHS 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 1627 38 Do not hold the R C button Prad Select a Product number from 0 9 Sk 00 Select amount of time that product should steam If no steam is required press the shelf A button to advance to the next step 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 cu 1 program Select the desired cooking curve from 0 7 FAno 0 Enter a desired Fan setting D
47. ontrols EHS C Complete Computerized Controls with a Manual Override system Programmable up to 10 products with four tiers for each program Independent Shelf Timers for each Shelf Load Control through use of Cooking Curves Shelf Compensation Timing for uniform baking Single speed fan EHS 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 VVVVVV e EHS 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 Independent Shelf Timer for each Shelf Load Control through use of Cooking Curves Shelf Compensation Timing for uniform baking Dual speed fan V INSTALLATIO 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 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
48. or 24 VAC at to common D If 24 VAC is not measured gt Check for 24 VAC at NC contacts on back up relay If 24 VAC is measured gt Check for 24 VAC at 5 gt Replace Interface board if defective 34 NO HEAT Manual Mode NOTE Fan must be operating before trouble shooting No heat PROBABLE CAUSE CORRECTIVE ACTION Back up relay not energizing gt Check for 240 VAC on relay coil If 240 VAC is measured Turn unit off and gt Check back up relay coil for 7 2 Q gt Check NO contacts for 24 VAC gt Replace if defective If 240 VAC is not measured Check back up switch SPDT for normal operation Replace if defective Defective thermostat Turn unit off and check for continuity while cycling thermostat on and off Replace if defective Defective contactor Check for 24 VAC at heater coil If 24 VAC is measured Turn oven off and gt Check for continuity through coil gt Replace if defective If 24 VAC is not measured Turn oven off and gt Check for continuity through hi temp wires going to over temp thermostat gt Replace over temp thermostat if defective Defective elements gt Check elements for continuity gt Replace if defective Defective over temp thermostat gt Check for 24 VAC on 55 red wire to common D If 24 VAC is not measured Turn oven off and gt Check for continuity through over temp thermostat gt Replace if defective
49. rary 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 The READ CLEAR button has several functions gt 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 88888 appears in the display will cancel the current mode of the control and return the display to EntEr 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 FAN FUNCTION TIER 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 The convection fan has two programmable options Fan On Fan 1 runs the convection fan c
50. 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 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 CSA STD C22 1 The electrical service entrance is provided by a 1 1 4 inch knock out at the oven back directly behind the control compartment Grounding lugs are provided at the rear service entrance INSTALLING THE LEGS Legs are available for single double and counter top installations Single deck installations require a 28 inch leg double deck installations require a 16 inch leg and counter top installations require a 4 inch leg To install the 28 inch legs place some cardboard on the floor and gently tip the oven onto its back Fasten two legs to the oven s front Lift the oven onto its front legs and block the back up using one of the 28 inch legs set upside down in the center rear of the oven body Install the last 28 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 16 inch legs follow the same i
51. 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 VVVVV NO DISPLAY 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 5SVDC check toggle switch for normal operation Defective Control Confirm that 208 240V AC is feeding primary coil Transformer 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 Defective Display gt Check ribbon cable connections gt 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 TP1 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 IMPORTANT NOTICE Power must be disconnected at source when disconnecting any ribbon cable or any connector from CPU or Display
52. tion Each model has 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 8 PIN CONNECTOR EHS C PROBE CONNECTION E RIBBON CONNECTOR GHS C 44 EHS C TEST POINT LAYOUT TOTERMIHAL FROM POWER BLOCK POWER SWITCH TOBOTTON OF CONTROL cee Tagz outs CIRCUIT CONTROL 6 L 50 PIN CONNECTOR 20 PIN CONNECTOR MICROPROCESSOR CIRCUIT BOARD ij CONNECTOR TEST POINT FOR IER i TO TEMPERATURE 111 OUTPUT i sensor 1 5 BUZZER RESET STRAPPING BARS EM CIRCUIT 50 TO POWER P CONNECTOR SWITCH E TO 8 PIN CONNECTOR M RIBBOH COHHECTOR 2 24 VOLTS AC INPUT 3 BLANK 4 HEAT OUTPUT 5 MOTOR OUTPUT B STEAM OUTPUT OPTIONAL 45 EHS PP PT TEST POINT LAYOUT MOTOR HIGH MOTOR LOW STEAM ECCO GCCO LIGHTS POWER GREEN BLUE GREEN GREEN GREEN GREEN
53. ton and remove product from that shelf EHS PP TYPICAL OPERATION SEQUENCE 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 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 27 Power switch turned on 240 208 VAC across Common terminals on power switch and B terminal of 12 pin Terminal block 240 208 VAC to Common terminals of Motor relay 240 24 volt transformer energized 24 VAC across C a
54. ure Sensor 41100 12 Oven Rack 50200 34 Oven Rack Slide 50200 67 Door Handle 11 1 2 Long Black T Style 50800 12 Complete Door Assembly 51100 53 Baffle 60101 621 Door Magnet 60102 147 Top Panel 60102 136 Rear Panel 60102 1361 Right Hand Panel 60102 1364 Switch Plunger 60102 40 Switch Plunger Oven Door After V 27971 Except Reversible door 30301 11 Switch Micro Convection Oven Door Before V 27971 51100 18 Door Seal 60102 97 Panel Label Purple Plus 60101 7662 Hinge Bracket Assembly Upper and Lower 50313 030 Knob Thermostat 450 F Oven 70701 28 Window Assembly Oven Door 71301 04 Blower Wheel 71500 06 Wiring Harness Element EH 550 Wiring Harness Power Switch EH 554 Wiring Harness High Voltage Control EH 551 Wiring Harness Low Voltage Control EH 553 58 59

Service Manual for the Lang Models

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