Moffat E31 Operators Manual

E31 CONVECTION OVEN

SERVICE

MANUAL

E31 convection oven (Applies to units from S/N 40423)

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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 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.

SECTION PAGE NO.

1. SPECIFICATIONS......................................................................................................... 5

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

3. OPERATION .................................................................................................................. 9

3.1 Description of Controls

3.2 Explanation of Control System

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

4.1 Cleaning

4.2 Routine Procedures

5. TROUBLE SHOOTING GUIDE ..................................................................................... 14

6. SERVICE PROCEDURES ............................................................................................. 17

6.1 Fault Diagnosis

6.2 Access

6.3 Replacement

6.4 Adjustment / Calibration

7. ELECTRICAL SCHEMATICS........................................................................................ 32

8. ELECTRICAL WIRING DIAGRAMS ............................................................................. 33

9. SPARE PARTS .............................................................................................................. 34

10. ACCESSORIES / OPTIONS.......................................................................................... 35

11. PARTS DIAGRAM ........................................................................................................ 36

11.1 Main Assembly

11.2 Control Panel Assembly

12. SERVICE CONTACTS.................................................................................................. 41

APPENDIX A. POWER RELAY UPGRADE KIT ................................................................... 43

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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MODEL: E31

1. SPECIFICATIONS

(1.55)

FRONT

(28.35)

(4.70)

(23.60)

(23.10)

(6.30)

(1.85)

SIDE

PLAN

LEGEND

- Electrical connection entry point

- Water entry - 9mm /

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

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/8” I.D male hose connection

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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 468 mm / 18.5” Height 418 mm / 16.5” Depth 432 mm / 17” Oven Volume 0.08 m³ / 3.0 ft³

OVEN RACK SIZE

Width 460 mm / 18” Depth: 370 mm / 14.5”

ELECTRICAL SUPPLY SPECIFICATION OPTIONS

208 V AC 60 Hz, 14.6 A, 3.2kW @ 208 V 220-240 V AC 60 Hz, 13.0 A, 3.1kW @ 240 V 208-220 V AC 50 Hz, 14.6 A, 3.2kW @ 220 V 230-240 V AC 50 Hz, 13.0 A, 3.1kW @ 240 V

ELECTRICAL PLUG SPECIFICATION REQUIREMENTS

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

1363A United States 3-pin 250V 15A, NEMA 6-15 Other Countries 3-pin 250V 13A minimum,

type to meet country stan-

dards

WATER SUPPLY CONNECTION Max Pressure 550 kPa / 5.5 bar / 80 psi Min Pressure 100 kPa / 1.0 bar / 15 psi

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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 THE POWER SUPPLY

Unpack and check unit for damage and report any damage to the carrier and dealer. Report any deficiencies to your dealer. Fit the feet which are packed inside the oven. Fit door handle to oven door. Check that the available power supply is correct to that shown on the rating plate located on the right-hand side panel (refer figure 2.3).

208 V AC 60 Hz, 14.6 A, 3.2kW @ 208 V 220-240 V AC 60 Hz, 13.0 A, 3.1kW @ 240 V 208-220 V AC 50 Hz, 14.6 A, 3.2kW @ 220 V 230-240 V AC 50 Hz, 13.0 A, 3.1kW @ 240 V

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”

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/legs used with bench or floor 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.

DOUBLE STACKING UNITS

When it is desired to mount one unit on top of another the 31mm (1¼") high spacer feet must be used. These short feet should be screwed on, and the unit lifted on top of the bottom unit, where it locates safely under its own weight, for normal applications.

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

E31 convection ovens are supplied with pre-fitted cords. Ensure unit is fitted with the correct cord and plug for the installation (refer specifications section).

Figure 2.1

Should changing of the cord be necessary, gain access to the electrical connection terminal block and strain relief by removing the back panel (four screws).

WATER CONNECTION

A cold water supply should be fitted to the water inlet (9mm /

/8” hose connection) which is located on the rear of the left hand side of the unit.

Connect water supply - Max inlet pressure 80psi / 550kPa.

Turn on water supply to check for leaks.

IMPORTANT: MAXIMUM INLET WATER

PRESSURE IS 550 kPa / 80 psi.

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DOOR HANDLE INSTALLATION

1. Open oven door.

2. Remove two screws (item 2).

3. Remove the two screws (item 3) from the handle (item 1).

4. Install the handle bracket through the slot on the door side.

5. Screw in the two screws (item 2) fully, then fully screw in the previous two screws (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

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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. THERMOSTAT

Temperature range 50 - 280°C (120 - 550°F). Indicator illuminates when elements are cycling ON to maintain set temperature.

GRILL POSITION - The GRILL indicator will illuminate indicating that the GRILL 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. ROAST N HOLD

Depress switch to activate ’ROAST N HOLD’ function (Switch illuminates when ON).

5. ROAST TIMER

3 Hour roast timer. (Indicator illuminates when “time up” (0) reached, and product held at 75°C (167°F).

6. STEAM SWITCH

Push switch to activate water injection (Water injects into oven while the button is depressed).

7. LIGHT SWITCH

Push switch to activate oven light. (Light illuminates while button depressed).

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3.2 EXPLANATION OF CONTROL

SYSTEM

The E31 Turbofan convection oven features 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 all to the controls of the oven. With the power switch Off all functions of the oven are inoperable.

With the power switch On (illuminated) power is directly supplied to the 60 minute bake timer, steam (water injection) switch, door microswitch, light switch, and the temperature control circuit. Accordingly the oven circulation fan will operate when the door is closed, and with door open the oven light will come on and the circulation fan will shut down, as these are controlled via the door microswitch. The control panel light switch will turn the oven light on when the door is closed only when the light switch is held in.

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 steam (water injection) switch on the control panel can be operated whenever the power switch is On. The switch is momentary like the light switch and when depressed, will operate the electric solenoid valve at the rear of the oven and inject water into the water trough at the bottom of the left hand side rack in the oven. Releasing the steam button will close the solenoid valve. This feature is used to instantaneously add moisture into the oven cavity, or to introduce a reservoir of water in the water trough to maintain humidity in the oven chamber and minimise product’s

moisture loss during cooking.

The temperature control of this oven is with a capillary type thermostat which can be set to a required cooking temperature, or set to the Grill/Broil position to provide top browning or grilling/broiling in the oven.

The thermostat switch has a separate switch body assembled onto the front from the shaft assembly and when the thermostat is set to a cooking temperature, one set of contacts is closed to switch power from the oven thermostat to the bottom heating element in the oven. The second switch contact of this switch assembly remains open in this setting and isolates power from the top element inner coil. The top element outer coil is directly switched on from the oven thermostat. Accordingly only the top outer element and the bottom element are used when a cooking temperature is selected. 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 thermostat control is set to the Grill position the first switch contact opens and the second switch contact closes. This arrangement allows power to be provided to the top element inner coil when the thermostat is On, and isolates power from going to the bottom heating element. The top element outer coil which is directly fed from the oven thermostat switch is therefore On in conjunction with the top element inner coil when the thermostat is set to the Grill position. As both the top inner and outer element coils are thermostatically controlled, the elements will cycle On/Off with the door closed as the thermostat setting in the Grill position is 300°C (600°F). If the Grill position is selected with the door open, the elements will remain On continuously and the circulation fan will be turned Off. The control panel Grill indicator will illuminate when the thermostat is set to the Grill position and will cycle On and Off with the main heating indicator light.

The E31 Turbofan convection oven features a Roast-and-Hold system which can be used to automatically set the oven to a fixed holding temperature at the end of a timed cooking period. When the Roast-and-Hold switch is turned On the switch will illuminate and turn on a mini-contactor found on the inside of the control panel. When the contactor is switched On a normally closed switch pole on the

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contactor is open and the normal power supply to the oven thermostat is isolated. A second normally open switch pole is closed and this provides power to the 3 hour roast timer.

If the roast timer is in the Hold (vertical) position the timer switch contacts will be in their normally closed position and supply power directly to the Hold thermostat located behind the control panel. The Hold thermostat is factory set to 75°C (167°F) and will directly supply power to the bottom heating element as required to maintain its preset temperature.

If the main thermostat is turned On, power will also be supplied to the top outer element coil through the first switch contact of the thermostat front switch assembly. In this case the thermostat heating light will also cycle On/ Off as the Hold thermostat maintains temperature.

In the Roast-and Hold mode the 3 hour timer can be set to a selected roasting time. During this time period the normally open switch contacts of the timer are closed. The timer has two change over switches and in this position one is used to supply power to its timing motor and the other is used to switch power directly to the main oven thermostat. During the 3 hour timer run-down period the oven temperature will be controlled by the main oven thermostat to the set temperature and operate as previously described.

When the 3 hour timer has run down and reached the Hold position the two switch contacts change over to their normally closed position which isolates power from the timer motor and the oven thermostat. It also switches power back to the oven hold thermostat. At this point the temperature control is now maintained by the hold thermostat as previously described. To cancel the hold circuit the Roast-and-Hold switch is turned Off. This turns off the contactor which removes power from the 3 hour timer and closes the contactor pole on the contactor that feeds the main oven thermostat.

The factory preset hold thermostat can be adjusted as required to change the holding temperature if necessary. Refer Service section for this procedure.

The following Troubleshooting Guide 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.

SIDE RACKS

To remove, take hold of the centre rung and swing towards the oven top. To replace, hold horizontally, engage in holes and swing down.

FAN BAFFLE

To remove, unscrew the oven lamp glass and lift the baffle out. To replace, locate the bottom edge of the baffle over the bottom element terminal plate and secure in place with the oven lamp glass.

IMPORTANT: DO NOT OVER TIGHTEN LAMP GLASS.

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, ensure that the lip is facing the oven opening. Fit the top and bottom seals first, then the side seals.

OVEN DOOR GLASS

Clean with conventional glass cleaners

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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 Check for liming / scale build-up in water nozzle. 12 months

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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.

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)

(Fan only operates with door closed).

Door microswitch out of adjustment.

(Refer fault diagnosis 6.1.2)

Door microswitch faulty

(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 6.4.2)

Replace.

(Refer service section 6.3.2)

Replace.

(Refer service section 6.3.15)

Check and tighten any loose wiring.

OVEN LIGHT NOT ILLUMINATING - DOOR OPEN

OVEN LIGHT NOT ILLUMINATING - DOOR CLOSED

NO WATER INJECTION / STEAM

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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)

Water not turned on.

Oven water nozzle blocked.

Fault with water valve.

(Refer fault diagnosis 6.1.5)

Steam switch faulty.

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Replace.

(Refer service section 6.3.1)

Replace.

(Refer service section 6.3.1)

Replace.

(Refer service section 6.3.4)

Turn water on at water supply.

Remove, clean or replace. (Refer service section 6.3.13)

Service or replace as required.

(Refer service section 6.3.11,

6.3.12)

Replace.

(Refer service section 6.3.4)

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