Moffat E31 Service Manual
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Moffat E31 Service Manual

Moffat e31 convection oven service manual
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E31 CONVECTION OVEN
Applies to Units from S/N 40423
SERVICE
MANUAL
31
Manual P/N MOME
Revision 2F/3506
October, 2002

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Summary of Contents for Moffat E31

  • Page 1 E31 CONVECTION OVEN Applies to Units from S/N 40423 SERVICE MANUAL Manual P/N MOME Revision 2F/3506 October, 2002...
  • Page 2 WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. Revision 2/F3506...

  • Page 3: Table Of Contents

    CONTENTS This manual is designed to take a more in depth look at the E31 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.
  • Page 4 Revision 2/F3506...

  • Page 5: Specifications

    1. SPECIFICATIONS MODEL: E31 (28.35) (23.60) (1.55) (4.70) SIDE FRONT PLAN LEGEND - Electrical connection entry point - Water entry - 9mm / ” I.D male hose connection Dimensions shown in millimetres. Dimensions in inches shown in brackets. Revision 2/F3506...
  • Page 6 LOCATION To ensure correct ventilation for the motor and controls the following minimum installation clearances are to be adhered to: Rear 25mm / 1” Left-hand side 25mm / 1” Right-hand side 25mm / 1” OVEN INTERNAL DIMENSIONS Width 468 mm / 18.5” Height 418 mm / 16.5”...

  • Page 7: Installation

    (refer figure 2.3). ELECTRICAL CONNECTION E31 convection ovens are supplied with 208 V AC 60 Hz, 14.6 A, 3.2kW @ 208 V pre-fitted cords. Ensure unit is fitted with the 220-240 V AC 60 Hz, 13.0 A, 3.1kW @ 240 V correct cord and plug for the installation (refer 208-220 V AC 50 Hz, 14.6 A, 3.2kW @ 220 V...
  • Page 8 (item 3). Ensure that they are tight. Figure 2.2 RATING PLATE LOCATION The rating plate for the E31 convection oven is located at the bottom left corner of the RH side panel. Rating Plate Figure 2.3...

  • Page 9: Operation

    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 1. POWER Depress to switch power on or off (switch illuminates when power is on). 2.

  • Page 10: Explanation Of Control System

    On. The switch is momentary like the light switch and when depressed, will The E31 Turbofan convection oven features a operate the electric solenoid valve at the rear Roast-and-Hold system which can be used to...
  • Page 11 contactor is open and the normal power be used to identify any incorrect oven supply to the oven thermostat is isolated. A operation. On correct identification of the second normally open switch pole is closed operating fault the Troubleshooting Guide will and this provides power to the 3 hour roast make reference to the corrective action timer.

  • Page 12: Maintenance

    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 WARNING: ALWAYS TURN THE seals first, then top and bottom.

  • Page 13: Routine Procedures

    4.2 ROUTINE PROCEDURES PROCEDURE INTERVAL DOOR SEALS Check for deterioration. 12 months DOOR PIVOT BUSHES Check for wear. 12 months DOOR CATCH Ensure that catch is adjusted such that the door closes 12 months properly. ELEMENTS Check that element resistances are correct to their rating 12 months (refer 6.3.13) WATER NOZZLE...

  • Page 14: Trouble Shooting Guide

    5. TROUBLE SHOOTING WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY. FAULT POSSIBLE CAUSE REMEDY THE OVEN DOES NOT The mains isolating switch on Turn on. OPERATE / START the wall, circuit breaker or fuses are “off”...
  • Page 15 FAULT POSSIBLE CAUSE REMEDY CONTINUOUS WATER OUT With oven on only—Electrical Correct electrical fault. OF OVEN WATER NOZZLE fault. (Refer fault diagnosis 6.1.6) With oven on or off—Fault with Service or replace as required. water valve. (Refer service section 6.3.11, 6.3.10) 60 MINUTE TIMER WILL NOT Timer faulty.
  • Page 16 FAULT POSSIBLE CAUSE REMEDY NO THERMOSTAT HEATING Indicator faulty. Replace. INDICATOR (Refer fault diagnosis 6.1.14) (Refer service section 6.3.3) GRILL NOT WORKING Element faulty / blown. Replace. (Refer fault diagnosis 6.1.15) (Refer service section 6.3.14) GRILL INDICATOR LIGHT NOT Indicator faulty. Replace.

  • Page 17: Service Procedures

    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 PAGE NO. FAULT DIAGNOSIS ......................19 6.1.1 Oven Does Not Operate / Start ................19 6.1.2 Fan Does Not Operate ..................
  • Page 18 6.3.15 Fan ........................27 6.3.16 Motor ........................28 6.3.17 Outer Glass ......................28 6.3.18 Inner Glass ......................29 6.3.19 Inner Glass Seal ....................29 6.3.20 Door Seals ......................29 6.3.21 Door Pivot Bushes ....................29 ADJUSTMENT / CALIBRATION ..................30 6.4.1 Thermostat Calibration ..................

  • Page 19: Fault Diagnosis

    Fan motor faulty 6.1 FAULT DIAGNOSIS Check the supply voltage across motor terminals. If there is no voltage then check 6.1.1 OVEN DOES NOT OPERATE / START the electrical connections of supply wiring. If voltage is correct then check the oven fan Incorrect electrical supply for free rotation.

  • Page 20: Continuous Water Out Of Oven Water Nozzle

    Check voltage to the bottom terminal of the If no voltage at terminal 2 then timer is switch. If there is no voltage, then check faulty—replace. wiring. NOTE: Timer will continue With switch depressed, check for voltage at approximately three minutes below top terminal.

  • Page 21: No Temperature Control

    then check for voltage at terminal P6. 6.1.10 NO TEMPERATURE CONTROL power to P6 (and none to 6), then the thermostat is faulty—replace. Thermostat faulty NOTE: Correct bottom element current draw: With thermostat in off (vertical) position, the 208 V : 9.6A ±...

  • Page 22: Grill Indicator Not Working

    NOTE: Top inner element current draw: terminal 1 to terminal 3 or 4. If there is no voltage then check for fault in wiring. 208 V: 8.7A ± 5% 220—240 V: 7.8A ± 5% Check voltage across terminal 2 to terminal 3 or 4.

  • Page 23: Access

    6.2 ACCESS 6.2.3 BAFFLE 1) Remove trays, racks, element cover and left hand side rack. 6.2.1 CONTROL PANEL 2) Undo lamp cover. 1) Open the oven door. Remove microswitch button by pulling straight off. Lamp Undo the two screws now visible. Cover Microswitch Button...

  • Page 24: Replacement

    6.3 REPLACEMENT Neon Wires 6.3.1 LIGHT BULB / GLASS 1) Unscrew lamp cover. Lamp Cover Figure 6.3.3 2) From back push neon through front of panel rotating clockwise. 3) Push new neon in from front of panel, and reconnect wires. 6.3.4 POWER / ROAST / LIGHTS / WATER Figure 6.3.1 SWITCHES...

  • Page 25: Bake Timer

    3) Withdraw and remove two screws holding 3) Transfer wires to new timer. buzzer to bracket. 4) Withdraw old timer and insert new timer, securing with screws. 5) Replace knob. 6.3.8 THERMOSTAT Screws 1) Pull knob off front of thermostat 2) Open control panel (refer 6.2.1) and undo two screws securing thermostat.

  • Page 26: Hold Thermostat

    6.3.9 HOLD THERMOSTAT 6.3.11 WATER SOLENOID 1) Ensure water supply is turned off. 1) Open control panel (refer 6.2.1) and undo two screws securing hold thermostat 2) Inside the oven remove the baffle (refer bracket. 6.2.3), then unscrew the water injection nozzle.

  • Page 27: Water Solenoid Cleaning

    2) Unscrew the element from inside the 6.3.12 WATER SOLENOID CLEANING oven. 1) Remove water solenoid (refer 6.3.10). 2) Remove the two screws securing the bracket to the solenoid. Top Element One Screw Two Screws Bottom Element Two Screws Figure 6.3.21 Figure 6.3.18 3) Pull element carefully to remove.

  • Page 28: Motor

    3) Remove LH screw whilst supporting the 6.3.16 MOTOR door. Lift bracket and remove door from 1) Remove fan (refer 6.3.14) and then oven. remove the wires that go to the motor. 2) Undo the four screws holding the motor bracket in place (from the outside) and remove motor assembly.

  • Page 29: Inner Glass

    6.3.18 INNER GLASS 6.3.21 DOOR PIVOT BUSHES 1) Remove door as per steps one to three of 1) Remove the outer glass as above. section 6.3.16. Uncrimp the retaining lugs of the window spacer and remove the spacer and glass. 2) Door bushes can now be removed and replaced.

  • Page 30: Adjustment / Calibration

    Thermostat 6.4 ADJUSTMENT / CALIBRATION 6.4.1 THERMOSTAT CALIBRATION IMPORT ANT: OVEN T E M P E R A T U R E N E E D S INCREASED, ENSURE THAT THERMOSTAT IS IN THE ‘OFF’ POSITION BEFORE CARRYING OUT ADJUSTMENT. Figure 6.4.3 IF OVEN TEMPERATURE NEEDS TO BE 5) Carefully remove two screws holding Grill/...

  • Page 31: Door Microswitch Adjustment

    6.4.2 DOOR MICROSWITCH ADJUSTMENT 6.4.4 HOLD TEMPERATURE ADJUSTMENT 1) Open oven door. 1) The hold temperature of the oven can be adjusted by turning the hold thermostat 2) Remove service panel (refer 6.2.2). dial to the desired hold temperature. This 3) With fingers, bend actuator arm of dial is located inside the control panel.

  • Page 32: Electrical Schematics

    7. ELECTRICAL CIRCUIT SCHEMATIC Revision 2/F3506 -32-...

  • Page 33: Electrical Wiring Diagram

    8. ELECTRICAL WIRING DIAGRAM Revision 2/F3506 -33-...

  • Page 34: Spare Parts

    9. SPARE PARTS PART NO DESCRIPTION CONTROLS 021473 Switch - Power 017121 Thermostat 020823 Knob - Thermostat / Bake Timer 020849 Neon Indicator 011760 Bake Timer 011794 Buzzer 021476 Switch - ‘Roast n Hold’ 011419 ‘Roast n Hold’ Timer 021472 ‘Roast n Hold’...

  • Page 35: Accessories / Options

    10. ACCESSORIES 100 MM (FOUR INCH) FOOT OPTION OVEN RACKS (PART NO 12809) (PART NO 13048) 25 MM (ONE INCH) FOOT OPTION (PART NO 13908) SCONE TRAYS (PART NO 02083) A25 STAINLESS STEEL STAND Revision 2/F3506 -35-...

  • Page 36: Parts Diagram

    11. PARTS DIAGRAMS 11.1 MAIN ASSEMBLY Revision 2/F3506 -36-...
  • Page 37 Part No. Description 021533 WRAPPER 090406 INSULATION 013011 COVER PANEL 013012 COVER PANEL PLATE 011412 MICROSWITCH BRACKET 011389 MICROSWITCH INSULATOR 002990 MICROSWITCH 003012 ACTUATOR ROD 011414 VENT TUBE 003016 MOTOR MOUNTING PLATE 013431 MOTOR 012782 HOSE CONNECTOR 011634 ELBOW 012781 SOLENOID VALVE 019208 SOLENOID MOUNTING BRACKET...
  • Page 38 021465 HANDLE BRACKET (HANDLE ASSEMBLY 021469) 021468 HANDLE (HANDLE ASSEMBLY 021469) ---------- CONTROL ASSEMBLY (SEE SECTION 1.2.1) 021530 BOTTOM TRIM 013610 DOOR BUSH (ALSO USED ON CONTROL PANEL PIVOT) 011424 PIVOT SUPPORT - BOTTOM ASSEMBLY 002340 DOOR INNER GLASS 090200 SILICON EXTRUSION - 1.74M 004452 DOOR GLASS CLAMP ANGLE...

  • Page 39: Control Panel Assembly

    11.2 CONTROL PANEL ASSEMBLY Revision 2/F3506 -39-...
  • Page 40 TIMER MOUNTING PANEL 011794 BUZZER 021537 BUZZER MOUNTING BRACKET 004722 CONTROL PANEL BAKBAR °C 004803 CONTROL PANEL BLUE SEAL °C 004729 CONTROL PANEL MOFFAT °F 013610 DOOR BUSH 021474 LIGHT / STEAM SWITCH 020823 THERMOSTAT / TIMER KNOBS 020849 PILOT LIGHT 021476 ROAST ‘N’...

  • Page 41: Service Contacts

    Fax (416) 760 0394 Stn “D” Free Call 1 888 537 7273 Toronto, ONT M6P 3J5 NEW ZEALAND CHRISTCHURCH 16 Osborne St Free Call 0800 Moffat PO Box 10-001 (0800 663 328) Christchurch Spare Parts Tel (03) 389 1007 Fax (03) 389 1276...
  • Page 42 Units 6-7 Mount St Tel 0121-327 5575 Business Park Fax 0121-327 9711 Birmingham B7 5QU England UNITED STATES OF AMERICA MOFFAT INC. 3765 Champion Blvd Winston-Salem Tel 1-800-551 8795 NC27115 Fax 336 661 9546 NATIONAL COVERAGE FOR SERVICE OR MAINTENANCE DIAL...

  • Page 43: Appendix A. Power Relay Upgrade Kit

    APPENDIX A. POWER RELAY UPGRADE KIT Kit Includes Power relay Screw - 8 x truss 160mm black wire 180mm red wire 950mm red wire 1050 red wire Assembly Instructions: (THE ELECTRICAL SUPPLY MUST BE DISCONNECTED) Remove the rear service panel. Mark and drill 2x ø3.5mm holes as per figure A.1.
  • Page 44 Units fitted with mini-contactor: Units fitted with ‘Schrack’ relay: WATER FAN MOTOR BOTTOM SOLENOID ELEMENT ELEMENT POWER RELAY Ø MICROSWITCH HEAT GRILL MAINS TERMINAL BLOCK WATER 1hr TIMER T/STAT 3hr TIMER LIGHTS TIME POWER ROAST BUZZER HOLD LIGHT HOLD T/STAT 29 15 SCHRACK RELAY Revision 2/F3506...

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