E25 CONVECTION OVEN SERVICE MANUAL Revision 4/F3501 July, 2003 Manual P/N M0ME25
WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.
CONTENTS This manual is designed to take a more in depth look at the E25 convection oven for the purpose of making the unit more understandable to service people. There are settings explained in this manual that should never require to be adjusted, but for completeness and those special cases where these settings are required to change, this manual gives a full explanation as to how, and what effects will result. SECTION PAGE NO. 1. SPECIFICATIONS .........................................................
10. ACCESSORIES / OPTIONS ......................................................................................... 37 11. PARTS DIAGRAM ........................................................................................................ 38 11.1 11.2 11.3 11.4 12. Main Assembly - E25 Main Assembly - E25B Control Panel Assembly - E25 Control Panel Assembly - E25B SERVICE CONTACTS ................................................................................................. 44 APPENDIX A.
1. SPECIFICATIONS 600 600 (23.6) 430 429 720 720 (28.4) 1 E 1 48 47 625 626 45 45 (1.9) (24.6) (1.75) 124 124 111 111 395 395 (4.9) (4.4) (15.5) FRONT SIDE 1 E PLAN LEGEND - Electrical connection entry point Dimensions shown in millimetres. Dimensions in inches shown in brackets. Revision 4/F3501 E -5- (16.
LOCATION To ensure correct ventilation for the motor and controls the following minimum installation clearances are to be adhered to: Rear Left-hand side Right-hand side 25mm / 1” 25mm / 1” 25mm / 1” OVEN INTERNAL DIMENSIONS Width 470 mm / 18.5” Height 254 mm / 10.0” Depth 420 mm / 16.5” Oven Volume 0.05 m³ / 1.75 ft³ OVEN RACK SIZE Width 460 mm / 18” Depth: 370 mm / 14.5” ELECTRICAL SUPPLY OPTIONS SPECIFICATION E25 100-120V ac, 60Hz, 13.3A, 1.6kW @ 120V 220-240V ac, 50/60Hz, 8.5A, 2.
2. INSTALLATION WARNING: THIS APPLIANCE MUST BE GROUNDED. WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. It is most important that the oven is installed correctly and that the operation is correct before use. Installation shall comply with local electrical, health and safety requirements. BEFORE USE BEFORE SUPPLY ELECTRICAL CONNECTION CONNECTION TO Operate the oven for about 1 hour at 200°C (400°F) to remove any fumes or odours which may be present.
3. OPERATION NOTE: A full user’s operation manual is supplied with the product and can be used for further referencing of installation, operation and service. 3.1 DESCRIPTION OF CONTROLS - E25 1. POWER Depress to switch power on or off (switch illuminates when power is on). 2. THERMOSTAT Temperature range 50 - 250°C (120 - 480°F). Indicator illuminates when elements are cycling ON to maintain set temperature. 1 3. BAKE TIMER 1 Hour bake timer. (Indicator illuminates when reached, and buzzer sounds).
3.2 DESCRIPTION OF CONTROLS - E25B 1. POWER Depress to switch power on or off (switch illuminates when power is on). 2. THERMOSTAT Temperature range 50 - 270°C (120 - 525°F). (Indicator illuminates when elements are cycling ON to maintain set temperature. 1 BROIL POSITION (E25B Only) - The BROIL indicator will illuminate indicating that the BROIL function has been set. The HEATING indicator will also illuminate whenever the elements are on. 3. BAKE TIMER 1 Hour bake timer.
3.3 a capillary type thermostat which can be set to a required cooking temperature. The E25B also features a Broil position to provide top browning or broiling in the oven. EXPLANATION OF CONTROL SYSTEM The E25 and E25B Turbofan convection ovens feature multi-function operator controls for which a correct understanding of their operation is required before carrying out any service or fault repair work.
open contacts to reset, thus switching the fan element off. The control panel indicator light above the thermostat knob cycles on and off with the thermostat to indicate when the elements are on and the oven is heating. When the E25B thermostat is set to the Broil position the first set of auxiliary switch contacts close and the second set open. The closed contacts provide power to the coil on the Broil relay. The opened contacts isolate power from the door microswitch to the main thermostat switch.
4. MAINTENANCE WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. 4.1 CLEANING OVEN SEALS To remove, hold at their centre point and pull forward until they unclip. Remove side seals first, then top and bottom. The seals may be washed in the sink, but take care not to cut or damage them. To replace the top seal, ensure that the lip is facing the oven opening. The left, right and bottom seals have the lip facing out.
5. TROUBLE SHOOTING WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. FAULT THE OVEN DOES NOT OPERATE / START POSSIBLE CAUSE REMEDY The mains isolating switch on Turn on. the wall, circuit breaker or fuses are “off” at the power board. The power switch on the oven is Depress switch. Switch will off. illuminate. FAN DOESN’T OPERATE Incorrect electrical supply. (Refer fault diagnosis 6.1.1) Ensure electrical supply correct. Power switch on unit faulty.
FAULT POSSIBLE CAUSE REMEDY Buzzer faulty. (Refer fault diagnosis 6.1.5) Replace. (Refer service section 6.3.5) Timer not switching on buzzer. (Refer fault diagnosis 6.1.5) Replace timer. (Refer service section 6.3.6) 60 MINUTE TIMER NO TIME UP INDICATOR Indicator faulty. (Refer fault diagnosis 6.1.6) Replace. (Refer service section 6.3.3) NO HEAT No power to thermostat. (Refer fault diagnosis 6.1.7) Identify fault and correct. Thermostat faulty. (Refer fault diagnosis 6.1.7) Replace.
FAULT POSSIBLE CAUSE REMEDY Element faulty / blown. (Refer fault diagnosis 6.1.12) Replace. (Refer service section 6.3.9) Faulty thermostat. (Refer fault diagnosis 6.1.12) Replace. (Refer service section 6.3.7) Heating relay faulty (Refer fault diagnosis 6.1.12) Replace. (Refer service section 6.3.8) Broil relay faulty (Refer fault diagnosis 6.1.12) Replace. (Refer service section 6.3.8) NO BROIL INDICATOR LIGHT (E25B ONLY) Indicator faulty. (Refer fault diagnosis 6.1.13) Replace.
6. SERVICE PROCEDURES WARNING: ENSURE POWER SUPPLY IS SWITCHED OFF BEFORE SERVICING. WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. SECTION 6.1 FAULT DIAGNOSIS .............................................................................................................18 6.1.1 6.1.2 6.1.3 6.1.4 6.1.5 6.1.6 6.1.7 6.1.8 6.1.9 6.1.10 6.1.11 6.1.12 6.1.13 6.1.14 6.1.15 6.2 Oven Does Not Operate / Start .........................................................
6.4 ADJUSTMENT / CALIBRATION ..........................................................................................28 6.4.1 6.4.2 6.4.3 6.4.4 Revision 4/F3501 Thermostat Calibration (E25) ..............................................................................28 Thermostat Calibration (E25B) ............................................................................28 Door Microswitch Adjustment ..............................................................................
6.1 FAULT DIAGNOSIS Microswitch n.c. 6.1.1 OVEN DOES NOT OPERATE / START Incorrect electrical supply Check that the voltage across phase and neutral (L1 and L2) terminals of terminal block is the voltage as stated on the unit’s electrical rating plate. com n.o. Figure 6.1.1 If incorrect, check electrical connection of supply wiring and / or check electrical supply. Power switch faulty 6.1.3 OVEN LIGHT NOT ILLUMINATING— DOOR OPEN Check if power switch latches.
Thermostat faulty - E25B Buzzer Terminals Set thermostat to 200°C or 400°F. With door closed, check the voltage out of terminal 2 on the thermostat. If there is no voltage then the thermostat is faulty—replace. Buzzer If the voltage is correct and the heating light is on then check all wiring to elements. Figure 6.1.2 Timer not switching on buzzer Heating relay faulty—E25B With timer in zero position, check voltage to input and output terminals of timer.
6.1.10 FAN ELEMENT NOT WORKING 6.1.12 BROIL NOT WORKING (E25B ONLY) Element faulty (blown) Element faulty / blown With the thermostat on and heating check voltage across fan element terminals at rear of oven. If the voltage is correct then check the current draw of element. If there is no current draw then element is faulty—replace. Set thermostat to broil position (fully clockwise). Check voltage at the broil element terminals at rear of oven. If voltage is correct then check current draw of element.
6.1.13 BROIL INDICATOR NOT WORKING (E25B ONLY) Indicator faulty With thermostat in broil position, check the voltage across the indicator terminals. If the voltage is correct then indicator is faulty— replace. If there is no voltage then check wiring. 6.1.14 OVEN OVERHEATS IN BROIL MODE (E25B ONLY) Heating relay faulty With the oven switched off, disconnect the wires from terminals 7 and 4 of the heating relay. Check for continuity through these terminals.
6.2 ACCESS 6.2.4 E25 CONTROL PANEL—REAR 6.2.1 CONTROL PANEL 1) Undo one screw at bottom of control panel. Power Switch Heating Indicator Thermostat Bake Time Up One Screw Bake Timer Figure 6.2.1 2) Pull out bottom of control panel and drop down to disengage tabs at top of control panel. Light Switch 6.2.2 SERVICE (REAR) PANEL Buzzer 1) Undo the four screws holding the panel. Figure 6.2.4 6.2.5 E25B CONTROL PANEL—REAR Four Screws Power Switch Heating Indicator Figure 6.2.
6.3 REPLACEMENT Neon Wires 6.3.1 LIGHT BULB / GLASS 1) Unscrew lamp cover. Figure 6.3.3 2) From back push neon through front of panel rotating clockwise. Lamp Cover 3) Push new neon in from front of panel, and reconnect wires. Figure 6.3.1 6.3.4 POWER / LIGHT SWITCHES 2) Unscrew bulb out of fitting. 1) With control panel open (refer 6.2.1) remove the wires from the back of the switch, noting their positions. 3) Screw in replacement bulb. 4) Replace lamp cover. Switch Wires 6.3.
6.3.6 BAKE TIMER 5) Withdraw old thermostat phial through rear of oven. 1) Remove bake timer knob by pulling it firmly away from control panel. 6) Insert new thermostat. 7) Re-assemble in reverse order. 2) Open control panel (refer 6.2.1) and undo two screws securing timer. 6.3.8 RELAY 1) Remove service panel (refer 6.2.2). 2) Undo two screws securing relay to oven. Two Screws Figure 6.3.6 Two Screws Broil Relay 3) Transfer wires to new timer.
6.3.10 FAN 220 - 240V Motors (from S/N 251948) 1) With baffle removed (refer 6.2.3) undo the centre nut. 60 Hz Terminal NOTE: LH thread - Turn clockwise to loosen. From S/N xxxxxx Take care with Spacer. Up to S/N xxxxxx Take care not to lose the two washers. Screws (4) Neutral 50 Hz Terminal Earth / Ground Figure 6.3.13 220 - 240V Motors (up to S/N 251947) 110V Motors (all) Centre Nut Figure 6.3.11 Phase Terminal Neutral Earth / Ground Screws (4) 2) Replace and re-assemble in reverse order.
6.3.14 DOOR SEALS 1) Open oven door. 2) To remove, hold at their centre point and pull forward until they unclip 3) Refit new seals. Note: Fit top and bottom seals first, with open side of seal facing downwards. Fit side seals with open side facing outwards. Two Screws Figure 6.3.16 5) To replace, ensure that the two silicone rubber seals are in place on the left hand and right hand side of the door frame.
Two screws Figure 6.3.21 Figure 6.3.24 3) Turn oven onto its back and remove three screws at each side securing wrapper, and two securing insulation panel. 9) Remove two screws securing insulation panel to oven liner. Two Screws Insulation panel 8 screws Figure 6.3.22 4) Undo two screws and remove lintel cover. Figure 6.3.25 5) Remove control panel (refer 6.2.1) and microswitch bracket (refer 6.3.2). Place inside oven. 6) Remove two screws securing support to oven and remove.
Calibration Nut 6.4 ADJUSTMENT / CALIBRATION Thermostat Shaft 6.4.1 THERMOSTAT CALIBRATION - E25 IMPORTANT: IF THE OVEN TEMPERATURE NEEDS TO BE INCREASED, ENSURE THAT THE THERMOSTAT IS IN THE ‘OFF’ POSITION BEFORE CARRYING OUT ADJUSTMENT. IF OVEN TEMPERATURE NEEDS TO BE DECREASED, ENSURE THERMOSTAT IS IN THE ‘MAX’ TEMPERATURE POSITION BEFORE CARRYING OUT ANY ADJUSTMENT. Broil Switch Thermostat 1) Turn off power. Figure 6.4.2 2) Remove thermostat knob by pulling it firmly away from control panel.
7) Adjust the calibration nut located at the base of the thermostat shaft. To increase oven temperature, turn calibration nut anticlockwise. To decrease oven temperature, turn calibration nut clockwise. Adjustment of the calibration nut by 1° angular will alter oven temperature by approximately 2°C (3.6°F). 6.4.4 60 MINUTE TIMER ZERO POSITION ADJUSTMENT 1) Remove 60 minute timer knob by pulling it firmly away from control panel. 2) Open control panel (refer 6.2.1).
Revision 4/F3501 2 4 1 3 N POWER SWITCH Ø TIME UP 2 1 3 B 1Hr TIMER BUZZER FAN NO NC DOOR MICRO SWITCH OVEN LIGHT HEATING LIGHT SWITCH OVEN T/STAT 1 P FAN ELEMENT 120v 1.55kW 240v 2.00kW 7.1 E25 -30- E L2 L1 7.
Revision 4/F3501 -31- E L2 L1 4 3 N TIME UP 2 2 1 POWER SWITCH Ø 1 3 B FAN BUZZER 1Hr TIMER NO NC OVEN LIGHT HEATING LIGHT SWITCH DOOR MICRO SWITCH BROIL 1 7 BROIL ELEMENT 2.00kW B4 A B4 6 1 7 6 9 9 3 3 P6 P5 1 A 6 5 2 FAN ELEMENT 2.00kW HEATING RELAY BROIL RELAY OVEN T/STAT 5-P5 BROIL 6-P6 FAN ELEMENT 7.
4 Revision 4/F3501 1 3 3 2 14 -32- 8 5 12 4 TIMER 15 1 2 11 LIGHTS 10 1 15 BUZZER 12 POWER 3 1 T/STAT HEAT 13 TIME UP 9 14 2 4 2 13 16 24 8 7 5 NC 6 NO 7 17 E 21 P 1 MAINS TERMINAL BLOCK N P MICROSWITCH COM N 16 19 E 22 24 6 23 2 1 EARTH STUD FAN MOTOR 4 3 17 18 22 20 19 ELEMENT 9 NOTE: USE TERMINAL 4 FOR BOTH 50Hz AND 50/60Hz MODELS 8. ELECTRICAL WIRING DIAGRAM 8.
4 Revision 4/F3501 1 3 3 2 14 -33- 8 5 12 4 TIMER 15 1 2 11 LIGHTS 10 1 15 BUZZER 12 POWER 1 T/STAT HEAT 13 TIME UP 9 14 2 4 3 2 13 16 24 8 7 5 NC 6 NO 7 17 E 21 P 1 MAINS TERMINAL BLOCK N P MICROSWITCH COM N 16 19 E 22 24 6 23 2 1 EARTH STUD FAN MOTOR 4 3 17 18 22 20 19 ELEMENT 9 NOTE: USE TERMINAL 4 FOR BOTH 50Hz AND 50/60Hz MODELS 8.1.
Revision 4/F3501 4 14 -34- 1 9 8 5 12 4 1 2 11 LIGHTS 10 1 15 BUZZER 12 POWER 1 T/STAT HEAT 15 13 TIME UP 3 2 TIMER 3 14 2 4 3 2 13 16 24 8 7 5 NC 6 NO 7 17 E 20 P 1 MAINS TERMINAL BLOCK N P MICROSWITCH COM N 16 19 E 22 24 21 23 17 FAN MOTOR EARTH STUD 6 18 22 21 19 ELEMENT 9 8.
7 4 8 T/STAT 2 9 3 2 11 13 5 4 12 TIME UP TIMER 11 15 16 17 1 2 18 1 25 24 27 BUZZER 12 26 BROIL 27 4 3 2 1 LIGHTS 26 HEAT POWER 2 40 14 1 6 P 19 MAINS TERMINAL BLOCK 28 10 33 34 N 14 E 38 32 E 40 29 N P MICROSWITCH 39 35 20 21 BROIL RELAY EARTH STUD 19 31 3 COM 6 5 1 9 NC 15 35 7 6 36 22 10 21 30 29 37 34 16 HEATING RELAY 23 31 FAN MOTOR 30 ELEMENT 38 3 4 NO 1 6 9 4 B -35- 2 3 7 P6 1 A 6 9 5 B 1 P5
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11. PARTS DIAGRAMS 11.
Pos Part No.
11.
Pos Part No.
11.3 CONTROL PANEL ASSEMBLY - E25 Pos Part No.
11.4 CONTROL PANEL ASSEMBLY - E25B (110V ONLY) Pos Part No.
11.
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APPENDIX A. DOUBLE STACKING KIT (24290) Kit Includes: 1 1 1 1 2 1 23 2 2 x x x x x x x x x Part No Vent Duct Vent Pipe Saddle Clamp Double Stack Front Double Stack Side Double Stack Rear 3 /8" x 8A Pozi Pan Hd Screw ½” x 8 Phillips Head Black Screw Black Fibre Washer Assembly Instructions: 24306 24307 10023 04907 24303 24302 41045 41046 10329 (THE ELECTRICAL SUPPLY MUST BE DISCONNECTED) A. Bottom Unit (Refer figure 1) 1. Position vent duct on bottom unit over oven vent.
C. Stacking the Ovens (Refer figure A.2) 1. With two persons, lift the top oven onto the bottom oven and position slightly forward so that the double stack front engages with the lintel support on the bottom oven, then slide the top oven back until the double stack sides are flush with the sides and rear of the bottom oven. 2. Secure double stack rear to bottom unit with three screws. Secure the double stack front to the lintel support of the bottom unit with two screws. 3.
Revision 4/F3501 -48-
