Moffat E25B Service Manual

E25 CONVECTION OVEN

E25MS CONVECTION OVEN

SERVICE

MANUAL

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WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.

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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......................................................................................................... 5

2. INSTALLATION............................................................................................................. 7

3. OPERATION .................................................................................................................. 8

3.1 Description of Controls—E25

3.2 Description of Controls—E25B

3.3 Explanation of Control System

4. MAINTENANCE............................................................................................................. 12

4.1 Cleaning

4.2 Routine Procedures

5. TROUBLE SHOOTING GUIDE..................................................................................... 13

6. SERVICE PROCEDURES ............................................................................................. 16

6.1 Fault Diagnosis

6.2 Access

6.3 Replacement

6.4 Adjustment / Calibration

7. ELECTRICAL SCHEMATICS ....................................................................................... 30

7.1 E25

7.2 E25B

8. ELECTRICAL WIRING DIAGRAMS............................................................................. 32

8.1 E25 (220 - 240V)

8.2 E25 (110V)

8.3 E25B

9. SPARE PARTS .............................................................................................................. 36

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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10. ACCESSORIES / OPTIONS ......................................................................................... 37

11. PARTS DIAGRAM ........................................................................................................ 38

11.1 Main Assembly - E25

11.2 Main Assembly - E25B

11.3.1 Control Panel Assembly - E25

11.3.2 Control Panel Assembly - E25B

11.4.1 Control Panel Assembly - E25MS

11.4.2 Control Panel Assembly - E25BMS

11.5 Door Assembly - E25MS

12. SERVICE CONTACTS.................................................................................................. 47

APPENDIX A. DOUBLE STACKING KIT .............................................................................. 49

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MODEL: E25 / E25B

1. SPECIFICATIONS

(1.9)

720

(28.4)

625

626

(24.6)

FRONT

600

(23.6)

429

430

(16.9)

124

(4.9)

(1.75)

111

(4.4)

395

(15.5)

SIDE

PLAN

LEGEND

- Electrical connection entry point

Dimensions shown in millimetres. Dimensions in inches shown in brackets.

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LOCATION

To ensure correct ventilation for the motor and controls the following minimum installation clearances are to be adhered to:

Top 200mm / 8” Rear 25mm / 1” Left-hand side 25mm / 1” Right-hand side 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 SPECIFICATION OPTIONS

E25

100-120V ac, 60Hz, 13.3A, 1.6kW @ 120V 220-240V ac, 50/60Hz, 8.5A, 2.05kW @ 240V

E25B 100-120V ac, 60Hz, 17.1A, 2.05kW @120V

ELECTRICAL PLUG SPECIFICATION REQUIREMENTS

E25

Australia 3-pin 250V 10A, AS/NZ 3112 Canada 3-pin 120V 15A, NEMA 6-15 New Zealand 3-pin 250V 10A, AS/NZ 3112 United Kingdom 3-pin 250V 13A fused, BS

1363A United States 3-pin 120V 15A, NEMA 6-15 Other Countries 3-pin 250V 10A minimum,

type to meet country

standards

E25B

Canada 3-pin 120V 20A, NEMA 6-20 United States 3-pin 120V 20A, NEMA 6-20

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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 CONNECTION TO POWER SUPPLY

Unpack and check unit for damage and report any damage to the carrier and dealer. Report any deficiencies to your dealer. Check that the available power supply is correct to that shown on the rating plate located on the righthand side panel.

E25

100-120V ac, 60Hz, 13.3A, 1.6kW @ 120V 220-240V ac, 50/60Hz, 8.5A, 2.05kW @ 240V

E25B 100-120V ac, 60Hz, 17.1A, 2.05kW @120V

LOCATION

To ensure correct ventilation for the motor, and controls the following minimum installation clearances are to be adhered to:

Top 200mm / 8” Rear 25mm / 1” Left-hand side 25mm / 1” Right-hand side 25mm / 1”

BEFORE USE

Operate the oven for about 1 hour at 200°C (400°F) to remove any fumes or odours which may be present.

ELECTRICAL CONNECTION

E25 convection ovens are supplied with pre-fitted cords. Ensure unit is fitted with the correct cord and plug for the installation. Refer specifications section. Should changing of the cord be necessary, gain access to the electrical connection terminal block, grounding lug, and strain relief by removing the back panel (four screws).

L1 L2

Phase

RED

BROWN

BLACK

WARNING:

Neutral

BLACK

BLUE

WHITE

THIS APPLIANCE MUST

BE GROUNDED / EARTHED

Ground

GREEN

GREEN/YELLOW

Figure 2.1

RATING PLATE LOCATION

The rating plate for the E25 convection oven is located at the bottom left corner of the RH side panel.

IMPORTANT: THE OVEN VENT

LOCATED ON THE CABINET TOP MUST NEVER BE OBSTRUCTED.

Position the oven in its allocated working position. Use a spirit level to ensure the oven is level from side to side and front to back. (If this is not carried out, uneven cooking could occur). The feet used with bench mounting or provided with stands are adjustable and will require adjusting in levelling the unit. It should be positioned so the operating panel and oven shelves are easily reachable for loading and unloading.

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Rating Plate

Figure 2.2

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.

3. BAKE TIMER 1 Hour bake timer. (Indicator illuminates when “time up” (0) reached, and buzzer sounds).

4. LIGHT SWITCH Push switch to activate light. (Oven light illuminates while button depressed).

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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.

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. (Indicator illuminates when “time up” (0) reached, and buzzer sounds).

4. LIGHT SWITCH Push switch to activate light. (Oven light illuminates while button depressed).

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3.3 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. The control device functions are explained as follows:

A power switch on the control panel isolates power to all the controls of the oven. With the power switch Off all functions of the oven are inoperable.

NOTE:

side of the heating element power relay on E25B models whenever the electrical supply is on.

With the power switch On (illuminated) power is directly supplied to the 60 minute bake timer, door microswitch, temperature control circuit, and the light switch. The light switch will turn the oven light on when the door is closed, but only whilst the light switch is held in.

The door microswitch on the E25 oven controls the oven light only. Accordingly the light will come on when the door is opened but the circulation fan and fan element will remain on. The door microswitch on the E25B oven however, controls the light, the circulation fan, and the fan element. Hence, opening the door on the E25B oven causes the circulation fan and fan element to switch off, as well as causing the oven light to come on. (The broil function incorporated into the E25B oven requires the fan to be inoperative when broiling with the door open).

The 60 minute timer is a mechanical timer and can therefore be operated with the oven’s power switch On or Off. However, only with the oven’s power switch On will the switch contacts of the 60 minute timer turn on the time-up buzzer and illuminate the time-up indicator on the control panel. The buzzer and time-up indicator provide indication that the time setting has run down to zero and at this point will remain On continuously until the 60 minute timer has been manually set back to the Off (vertical) position. The 60 minute timer does not control any other part of the oven’s operating system as this timer is independent of the temperature control and heating system.

The temperature control of these ovens is with

The supply voltage is fed to the input

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.

The E25 has an element coiled around the circulation fan in the rear of the oven. Power to the element is provided directly from the thermostat. The control panel indicator light above the thermostat knob cycles on and off with the thermostat to indicate when the element is on and the oven is heating. In the ‘Off’ position, the element relies on the thermostatic control to prevent it switching on. Accordingly, if the oven temperature drops below approximately 20°C the thermostat and element may cycle on at this setting.

The E25B features a Broil element (located in the top of the oven) as well as the fan element. The thermostat switch has a separate switch assembled onto the front of the shaft assembly. This auxiliary switch, depending on the thermostat setting, selects between the fan or broil elements, via a Broil relay located at the rear of the oven. A changeover contact on the broil relay determines which element is provided with power. In series with the broil relay is a second relay which is controlled by the main thermostat switch. This is the heating relay. One pole of the heating relay switches power to the fan element, the other pole switches power to the broil element. When the thermostat cycles, both poles are switched open or closed at the same time. However, since only one pole is being fed power by the broil relay, only the selected element cycles on.

When the E25B thermostat is set to a cooking temperature, one set of auxiliary switch contacts remain open. This isolates power from the coil of the two pole broil relay. In this state the normally closed contacts of the first pole provide power directly from the phase connection on the terminal block to the fan element pole on the heating relay. (The normally closed contact on the second pole is unused with this thermostat setting). The second set of auxiliary switch contacts is closed to feed power from the door microswitch to the main thermostat switch. When the thermostat cycles on it in turn feeds power to the coil of the heating relay, causing the changeover poles to switch. This closes the normally open contacts and provides power to the fan element. When the thermostat cycles Off it isolates power to the heating relay coil. This causes the normally

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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. With the thermostat in this setting, power to the coil of the broil relay causes the changeover contacts on both poles to switch. The normally closed contacts of the first pole on the Broil relay open, isolating power to the fan element. The normally open contacts of this pole close providing power instead to the broil element (via the heating relay). Switching of the second pole of the Broil relay closes the normally open contacts, providing power directly to the main thermostat switch. (This alternate power supply to the thermostat allows the Broil element to continue to operate with the oven door open and fan off). When the thermostat cycles On it provides power to the coil of the heating relay. When the heating relay switches, the normally open contacts on both poles close. However, with the thermostat in this position, power is only being provided to the pole feeding the broil element so only the broil element cycles On. When the thermostat cycles Off it isolates power to the heating relay coil. This causes the normally open contacts to reset, thus switching the broil element off again. With the door closed the broil element will cycle On/Off thermostatically at 600°F as this is the thermostat setting in the Broil position. With the door open the broil element will remain on continuously and the circulation fan will be turned off. The main heating indicator will cycle on and off with the thermostat and broil element, whilst the broil indicator will remain illuminated as long as the thermostat is in the Broil setting.

The following Troubleshooting Guide (pg 13) should be used to identify any incorrect oven operation. On correct identification of the operating fault the Troubleshooting Guide will make reference to the corrective action required, or refer to the Fault Diagnosis section and/or Service section to assist in correction of the fault.

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4. MAINTENANCE

WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.

4.1 CLEANING

WARNING: ALWAYS TURN THE POWER SUPPLY OFF BEFORE CLEANING.

IMPORTANT: THIS UNIT IS NOT

WATER PROOF. DO NOT USE A WATER JET SPRAY TO CLEAN INTERIOR OR EXTERIOR OF THIS UNIT.

EXTERIOR

Clean with a good quality stainless steel cleaning compound. Harsh abrasive cleaners may damage the surface.

INTERIOR

Ensure that the oven chamber is cool. Do not use wire brushes, steel wool or other abrasive materials. Clean the oven regularly with a good quality oven cleaner. Take care not to damage the fan or the tube at the right side of the oven which controls the thermostat.

OVEN RACKS

To remove, slide out to the stop position, raise the front edge up, and lift out.

BOTTOM BAFFLE

To remove, lift up the tray at the front finger hole and pull forward out of the oven.

SIDE RACKS

Undo the thumbscrew (anti-clockwise rotation) securing rack to oven wall, swing rack towards centre of oven to disengage location pin at front of side, and pull rack forward to remove. To replace, engage rack in rear holes, swing towards side of oven to engage in front hole, and replace thumbscrew.

FAN BAFFLE

To remove, undo thumbscrew (anti-clockwise rotation) at top of baffle and remove. Lift baffle out from rear of oven by tilting forward while lifting out of location studs at baffle base. Replace in reverse order.

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. Fit the top and bottom seals first, then the side seals.

OVEN DOOR GLASS

Clean with conventional glass cleaners

4.2 ROUTINE PROCEDURES

DOOR SEALS

Check for deterioration 12 months

ELEMENTS

Check that element resistances 12 months are correct to their ratings (refer 6.3.9)

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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 OPERATE / START

FAN DOESN’T OPERATE Door not closed (E25B only).

The mains isolating switch on the wall, circuit breaker or fuses are “off” at the power board.

The power switch on the oven is off.

Incorrect electrical supply.

(Refer fault diagnosis 6.1.1)

Power switch on unit faulty.

(Refer fault diagnosis 6.1.1)

Door microswitch out of adjustment (E25B only).

(Refer fault diagnosis 6.1.2)

Door microswitch faulty (E25B only).

(Refer fault diagnosis 6.1.2)

Fan motor faulty.

(Refer fault diagnosis 6.1.2)

Wiring.

Turn on.

Depress switch. Switch will illuminate.

Ensure electrical supply correct.

Replace.

(Refer service section 6.3.4)

Close door.

Adjust.

(Refer service section 6.4.3)

Replace.

(Refer service section 6.3.2)

Replace.

(Refer service section 6.3.11)

Check and tighten any loose wiring.

OVEN LIGHT NOT ILLUMINATING - DOOR OPEN

OVEN LIGHT NOT ILLUMINATING - DOOR CLOSED

60 MINUTE TIMER WILL NOT TIME DOWN

60 MINUTE TIMER INACCURATE BELOW 20 MINUTES

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Blown bulb.

No power to light.

(Refer fault diagnosis 6.1.3)

Blown bulb.

Light switch faulty.

(Refer fault diagnosis 6.1.4)

Timer faulty.

Timer not set correctly.

Zero (time up) position not set correctly.

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Replace.

(Refer service section 6.3.1)

Correct fault.

Replace.

(Refer service section 6.3.1)

Replace.

(Refer service section 6.3.4)

Replace.

(Refer service section 6.3.6)

For timer settings below 20 minutes, always rotate past 20 minutes, then back to desired time.

(Refer service section 6.4.4)

FAULT POSSIBLE CAUSE REMEDY

60 MINUTE TIMER NO TIME UP BUZZER

60 MINUTE TIMER NO TIME UP INDICATOR

Buzzer faulty.

(Refer fault diagnosis 6.1.5)

Timer not switching on buzzer.

(Refer fault diagnosis 6.1.5)

Indicator faulty.

(Refer fault diagnosis 6.1.6)

NO HEAT No power to thermostat.

(Refer fault diagnosis 6.1.7)

Thermostat faulty.

(Refer fault diagnosis 6.1.7)

Fan element not working.

(Refer fault diagnosis 6.1.10)

Heating relay faulty - E25B only. (Refer fault diagnosis 6.1.7)

NO TEMPERATURE CONTROL

Thermostat faulty.

(Refer fault diagnosis 6.1.8)

Heating relay faulty - E25B only. (Refer fault diagnosis 6.1.8)

Replace.

(Refer service section 6.3.5)

Replace timer.

(Refer service section 6.3.6)

Replace.

(Refer service section 6.3.3)

Identify fault and correct.

Replace.

(Refer service section 6.3.7)

Correct element fault.

(Refer Fault: Fan element)

Replace.

(Refer service section 6.3.8)

Replace.

(Refer service section 6.3.7)

Replace. (Refer service section 6.3.8)

SLOW RECOVERY Overloading of oven.

Electrical supply incorrect.

Fan not working.

Thermostat calibration. (Refer fault diagnosis 6.1.9)

FAN ELEMENT NOT WORKING

Element faulty (blown).

(Refer fault diagnosis 6.1.10)

Faulty thermostat.

(Refer fault diagnosis 6.1.10)

Heating relay faulty - E25B only.

(Refer fault diagnosis 6.1.10)

Broil relay faulty - E25B only.

(Refer fault diagnosis 6.1.10)

NO THERMOSTAT HEATING INDICATOR LIGHT

Indicator faulty.

(Refer fault diagnosis 6.1.11)

Reduce oven loading.

Check supply voltage is as per rating plate voltage.

Check fan operation.

Correct calibration.

(Refer service section 6.4.1,

6.4.2)

Replace.

(Refer service section 6.3.9)

Replace.

(Refer service section 6.3.7)

Replace.

(Refer service section 6.3.8)

Replace. (Refer service section 6.3.8)

Replace.

(Refer service section 6.3.3)

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FAULT POSSIBLE CAUSE REMEDY

BROIL ELEMENT NOT WORKING (E25B ONLY)

Element faulty / blown.

(Refer fault diagnosis 6.1.12)

Faulty thermostat.

(Refer fault diagnosis 6.1.12)

Heating relay faulty

(Refer fault diagnosis 6.1.12)

Broil relay faulty

(Refer fault diagnosis 6.1.12)

NO BROIL INDICATOR LIGHT (E25B ONLY)

OVEN OVERHEATS IN BROIL MODE—DOOR SHUT (E25B

Indicator faulty.

(Refer fault diagnosis 6.1.13)

Faulty heating relay.

(Refer fault diagnosis 6.1.14)

ONLY)

DOOR DOES NOT CLOSE Tray in way of door.

Door seal obstruction.

Door hinges worn.

Door hinge counter brackets worn.

Replace.

(Refer service section 6.3.9)

Replace.

(Refer service section 6.3.7)

Replace.

(Refer service section 6.3.8)

Replace.

(Refer service section 6.3.8)

Replace. (Refer service section 6.3.3)

Replace.

(Refer service section 6.3.8)

Correctly position tray in rack.

Correctly install door seal.

(Refer service section 6.3.14)

Replace.

(Refer service section 6.3.16)

Replace. (Refer service section 6.3.17)

DOOR SEAL LEAKS Door seal damaged.

Door seal incorrectly fitted.

POWER SWITCH DOES NOT SWITCH UNIT OFF

Power switch faulty. (Refer fault diagnosis 6.1.15)

Broil relay faulty (E25B only).

(Refer fault diagnosis 6.1.15)

Heating relay faulty (E25B only).

(Refer fault diagnosis 6.1.15)

Replace. (Refer service section 6.3.14)

Correctly install door seal. (Refer service section 6.3.14)

Replace.

(Refer service section 6.3.4)

Replace.

(Refer service section 6.3.8)

Replace.

(Refer service section 6.3.8)

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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.

6.1 FAULT DIAGNOSIS..............................................................................................................18

6.1.1 Oven Does Not Operate / Start............................................................................18

6.1.2 Fan Does Not Operate.........................................................................................18

6.1.3 Oven Light Not Illuminating—Door Open ............................................................18

6.1.4 Oven Light Not Illuminating—Door Closed ..........................................................18

6.1.5 60 Minute Timer No Time Up Buzzer ..................................................................18

6.1.6 60 Minute Timer No Time Up Indicator................................................................19

6.1.7 No Heat................................................................................................................19

6.1.8 No Temperature Control ......................................................................................19

6.1.9 Slow Recovery .....................................................................................................19

6.1.10 Fan Element Not Working....................................................................................20

6.1.11 No Thermostat Heating Indicator.........................................................................20

6.1.12 Broil Element Not Working...................................................................................20

6.1.13 Broil Indicator Not Working ..................................................................................21

6.1.14 Oven Overheats in Broil Mode.............................................................................21

6.1.15 Power Switch Does Not Turn Unit Off .................................................................21

6.2 ACCESS ................................................................................................................................22

6.2.1 Control Panel .......................................................................................................22

6.2.2 Service Panel (Rear Panel) .................................................................................22

6.2.3 Baffle ....................................................................................................................22

6.2.4 E25 Control Panel (Rear).....................................................................................22

6.2.5 E25B Control Panel (Rear) ..................................................................................22

6.3 REPLACEMENT....................................................................................................................23

6.3.1 Light Bulb / Glass .................................................................................................23

6.3.2 Door Microswitch .................................................................................................23

6.3.3 Indicator Neon Light.............................................................................................23

6.3.4 Power / Lights ......................................................................................................23

6.3.5 Buzzer ..................................................................................................................23

6.3.6 Bake Timer...........................................................................................................24

6.3.7 Thermostat ...........................................................................................................24

6.3.8 Relay ....................................................................................................................24

6.3.9 Element ................................................................................................................24

6.3.10 Fan ....................................................................................................................

6.3.11 Motor ....................................................................................................................25

6.3.12 Outer Glass..........................................................................................................25

6.3.13 Inner Glass...........................................................................................................26

6.3.14 Door Seals ...........................................................................................................26

6.3.15 Door Handle.........................................................................................................26

6.3.16 Door Hinges .........................................................................................................26

6.3.17 Hinge Counter Brackets .......................................................................................26

...25

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