S E R V I C E M A N U A L For all Evolution models manufactured from January 2001 Part No. 32Z3382e Issue No.
Table of Contents Safety Code ................................................................ 3 Product Specifications ................................................ 4 Dimensions. Location and Installation ........................ 5 Manual RHS controls .................................................. 7 Error Codes and Diagnostics ...................................... 8 Main Features ............................................................ 9 A -Power Output Testing to EN 60335-2-90:1996 .....
SAFETY CODE This manual is designed to assist engineers who have been on a recognised product familiarisation and training course run by Merrychef Limited. It has been prepared to offer technical guidance for the Merrychef Evolution range of Combination Microwave Ovens. Please remember that it is wiser not to attempt a service task if you are unsure of being able to complete it competently, quickly, and above all safely.
PRODUCT SPECIFICATIONS Model Number: EV + Voltage + Frequency + Phase + Version Model prefix Voltage Frequency EV 24=240V 5 = 50 Hz 6 = 60 Hz Power Requirement Voltage Current Single EV2451B Twin EV2452B Phase Control Type 1 = Single 2 = Twin 3= Three Phase B Microwave Convection Combination 240V 45A 20A 21A 41A P1 240V 25A 20A 1A 20A P2 240V 25A 0 20A 20A Convection Heat Combination 2000 Watts (IEC 705 Rating) Single & Twin supply 1800 Watts (IEC 705 Rating) Three Phase suppl
DIMENSIONS AND LOCATION A sample of this product has been tested and found to be in conformity with the following directives: Directive Harmonised standards applied.
INSTALLATION INSTRUCTIONS Power Supply Requirements The Evolution should be connected to a suitable electricity supply, which can cope with the switching-on surge that occurs with certain types of catering equipment, such as microwaves. Because of this requirement, we strongly recommend that a separate, suitably rated supply is installed for the oven. The supply for the oven should be fitted with a Type "C" circuit breaker. Please refer to rating plate for details.
MANUAL CONTROLS 1 POWER PADS 2 CONVECTION PAD 3 TIME/PROGRAM SELECT PADS 4 TEMPERATURE SETTING PADS 5 CANCEL PAD 6 PROGRAM PAD 7 TIME AND PROGRAM DISPLAY 8 MULTI-STAGE INDICATOR 9 COLON 10 ON/OFF SWITCH 11 ERROR DISPLAY PHUU\FKHI 7 TIME AND PROGRAM DISPLAY 1. 2. POWER PADS There are 4 Microwave Power Pads to select from: 25%, 50%, 75%, and 100%.
Error Codes and Diagnostics The Evolution will identify some of the most common problems by flashing an error message code in the time display window. (See also Error Light Operation page 17). These are the error messages and suggestions for repairing them. 1 Door not fully shut. Close door fully. 2 Possible electrical fault Door switch inoperative. 1 No time has been set. Set a time. 2 3 Invalid time has been set. Set a valid time. Invalid program has been set. Use call-back to check program.
MAIN FEATURES 1 1 7 2 9 3 8 10 11 4 12 5 13 6 1. TRAY HANDLE REST 6. There is one on each side of the oven for convenient storage of the tray handle. The handle may be used to remove hot trays and the rotating cooking carousel from the oven. 2. AIR OUTLETS These vents on the rear panel enable air which has been used to cool internal components to escape.
Procedure A - Power Output Test in accordance with BS EN 60335-2-25:1996 Annex AA This test is given in the BSI test standard for microwave ovens. It is reproduced below - not so that you can follow it, but to show you why it is impractical in normal conditions. A simplified procedure, which gives a good approximation to the BSI power output, is given in Procedure B which follows. Note: This test can only be carried out on a COLD oven.
Procedure B - Simplified Power Test You will need: A thermometer capable of reading to ±0.1°C. A Polypropylene tray approximately 200 mm x 200 mm. A measuring jug. A calculator. Water which is at a temperature of 10°C ± 2°C. 1. 2. 3. 4. 5. 6. 7. 8. Measure 1 litre of cold water into the tray using the measuring jug. Measure the water temperature, and record it as T[s]. Place the tray on the turntable in the oven and close the door. Turn the oven on. Set the timer to 1:02. Press the “100%” pad.
Procedure D - High Voltage Capacitor Test You will need: A Digital Multi-meter (D.M.M.) A Megger or similar resistance meter using 500V d.c. WARNING: High voltages and large currents are present at the High Voltage Capacitor. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements at the High Voltage circuits, including the magnetron filament .
PRINCIPAL COMPONENTS Right side 1 2A 2 8 8A 16 3 14 15 13A 13B 4 9A 9B 10A 10B 11A 11B 1 Magnetron cooling fan 2 5 12 7 6 Shown with component module cover removed 310110 9A Fuse 3 Amp 30Z0940 Magnetron 30Z0851 9B Fuse Holder 30Z0231 2A Self Tap Screw 31Z3133 10A Fuse 1 Amp 30Z0957 10B Fuse Holder 30Z0231 11A Fuse 10 Amp 30Z0217 11B Fuse Holder 30Z0231 3 Hot air fan 30Z1131 4 Transformer 30Z0931 5 Axial fan 30Z0941 6 Capacitor 30Z0385 7 Diode PCB assembly 11
Left side 17A 17B 18A 18B 19A 19B 17A Fuse 1 Amp 30Z0957 17B Fuse Holder 30Z0231 18A Fuse 1 Amp 30Z0957 18B Fuse Holder 30Z0231 19A Fuse 10 Amp 30Z0217 19B Fuse Holder 30Z0957 Page 14
Rear view 2A 3 20A 20B 21 22A 22B 23 24A 24B 25 26 Top view 20A Fuse 13 Amp 30Z0168 20B Fuse Holder 30Z0231 24A Fuse 25 Amp 31Z0473 RMC5055EX 24B Fuse Holder 31Z0474 21 Turntable motor 23 Interlock Contactor 22A Fuse 13 Amp 30Z0168 25 Heater Contactor 22B Fuse Holder 30Z0231 26 Overheat Safety Stat Page 15 340504 340504 30Z1024
OVEN DOOR ASSEMBLY 32 31 30 29 28 27 40 39 38 37 36 35 34 33 27 Black Handle RBR12852 28 Door Frame 40H0158 29 Door Cover Outer Skin 40H0080 30 Insulation Panel 40H0081 31 Door Reinforcement RMC70722 32 Striker Pin 31Z1214 33 Door Frame (B) MC3055 34 Insulation Wrap 32Z0001 35 Window Screen 40H0082 36 Door Base Silver MC3031KX04 37 Door Cover MC3064 38 Plate - Door Switch MC3056 39 Packing (B) MC3065 40 Internal Centre Panel 40H0146 Page 16
Door Interlock Operation The door on the Evolution oven is monitored by four microswitches. Three of these are used in the conventional “Primary, Secondary and Monitor” switch arrangement shown below, while the fourth is a low-voltage switch linked directly to the control circuitry.
INPUT WIRING DETAILS 2-Phase, Neutral and Earth Green / Yellow Blue Black Brown 47 48A 48 49 Single Phase Green / Yellow Blue Brown 47 48A 48 Note: early models are fitted with a 3-way terminal block 50 47 Mains Terminal Block 31Z0477 48 Cable Gland 31Z1070 48A Gland Nut 31Z1082 49 Mains Cable 4 Core 31Z0480 50 Mains Cable 3 Core 31Z0472 Page 18
Control Panel Assembly 46 45 45A 44 41 43 43A 42 41 Membrane Assembly 11H0048 42 On/Off Switch 30Z0503 43 Logic Assembly 11H0045 44 Support Shield 40H0075 45 Relay (PCB) Board 11H0046 46 15 Way Ribbon Connector 11Z0298 Models with Serial No.
Membrane Panel Circuit You will need: A Digital Multi-meter (D.M.M.) 1. 2. 3. 4. 5. Isolate the oven from the mains supply. Remove the Logic Assembly from the Control Panel Housing. Unplug the membrane “tail” from the Logic PCB Assy. Using a D.M.M., check for continuity between the correct terminals when the pads are pressed. When the panel has been tested, reassemble and re-test the control housing.
Circuit Diagram: Part 1 Page 21
Circuit Diagram: Part 2 Page 22
Parts Matrix 1 Magnetron cooling fan 2 Magnetron 2M121 2A Self Tap Screw 310110 25 Heater Contactor 30Z0851 26 Overheat Safety Stat 31Z3133 27 Black Handle RBR12852 340504 30Z1024 3 Hot air fan 30Z1131 28 Door Frame 40H0158 4 Transformer 30Z0931 29 Door Cover Outer Skin 40H0080 5 Axial fan 30Z0941 30 Insulation Panel 40H0081 6 Capacitor 0.
Reply Form: Manual corrections and modifications Whilst every effort has been made to ensure that the information contained in this manual is accurate and complete, if you believe that an error has been made, or if you have any suggestions for how the manual could be improved, please fill in and return this form. A review of any forms returned will be made on a regular basis, and the manual will be updated if required.
