Moffat E35-H251-26 Service Manual

E35 CONVECTION OVEN

SERVICE

MANUAL

Revision 5/F3512

January, 2004

Manual P/N M0ME35

CONTENTS

This manual is designed to take a more in depth look at the E35 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.................................................................................................................................. 8

3. OPERATION....................................................................................................................................... 10

3.1 Description of Controls

3.2 Explanation of Control System

4. MAINTENANCE ................................................................................................................................. 15

4.1 Cleaning

4.2 Routine Procedures

5. TROUBLE SHOOTING GUIDE .......................................................................................................... 17

6. SERVICE PROCEDURES.................................................................................................................. 20

6.2 Access

6.3 Replacement

6.4 Adjustment / Calibration

7. ELECTRICAL SCHEMATICS ............................................................................................................ 36

8. ELECTRICAL WIRING DIAGRAMS .................................................................................................. 39

9. SPARE PARTS .................................................................................................................................. 42

10. ACCESSORIES / OPTIONS............................................................................................................... 45

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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PARTS DIAGRAMS ..................................................................................................................................... 46

11.1 Main Assembly

11.2 Control Panel Assembly

11.3 Gear Plate Assembly

11.4 Door Assembly

SERVICE CONTACTS ................................................................................................................................. 60

APPENDIX A. STACKING KIT INSTRUCTIONS........................................................................................ 62

APPENDIX B. STAND MOUNTING INSTRUCTIONS ................................................................................ 65

APPENDIX C. MOTOR CONTROL AND STEAM TIMER ADJUSTMENT GUIDE .................................... 66

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MODEL: E35-26

880

(34.6)

1. SPECIFICATIONS

(3.0)

165

(6.5)

880

(34.6)

800

(34.6)

FRONT

720

(28.3)

VENT Ø 76 O.D.

(3.0)

MWS

ELECTRICAL ENTRY

MWS

(1.6)

WATER ENTRY

(2.2)

155

165

(6.1)

(1.9)

MWS

SIDE

665

6650

(26.2)

(0.5)

PLAN

LEGEND

- Electrical connection entry point

- Water entry - 3/4” BSP hose connection

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

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(24.8)

-5-

MODEL: E35-30

FRONT

880

(34.6)

720

(28.3)

VENT Ø 76 O.D.

(3.0)

WATER ENTRY

MWS

ELECTRICAL ENTRY

MWS

155

(6.1)

(1.6)

980

165

(6.5)

MWS

(2.2)

(1.9)

(38.6)

765

7650

(30.1)

800

(34.6)

(0.5)

SIDE

PLAN

LEGEND

- Electrical connection entry point

- Water entry - 3/4” BSP hose connection

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:

Rear 0mm / 0“ Left-hand side 0mm / 0” Right-hand side 75mm / 3.0”

OVEN INTERNAL DIMENSIONS E35-26

Width 465mm / 18

/4” Height 685mm / 27” Depth 760mm / 30” Oven Volume 0.24m³ / 8.5ft³

E35-30

Width 465mm / 18

/4” Height 685mm / 27” Depth 860mm / 34” Oven Volume 0.27m³ / 9.7ft³

OVEN RACK SIZE

Width 460mm / 18” or 405mm / 16” (Adjustable shelf width) Depth 660mm / 26” or 760mm / 30” (Based on oven size model)

OVEN RACK SPACING

6 Tray (standard) 105 mm / 4

/8”

8 Tray (option) 78 mm / 3“

ELECTRICAL SUPPLY SPECIFICATION OPTIONS

208V, 60Hz, 1P+N+E, 53.7A, 11.2 kW 220V, 50Hz, 1P+N+E, 56.8A, 12.5 kW 220-240V, 60Hz, 1P+N+E, 52.0A, 12.5 kW 230-240V, 50Hz, 1P+N+E, 52.0A, 12.5 kW 208V, 60Hz, 3P+E, 31A/Ph, 11.2 kW 220V, 50Hz, 3P+E, 33A/Ph, 12.5 kW 220-240V, 60Hz, 3P+E, 50.7A/Ph, 12.5 kW 220V, 60Hz, 3P+E, 32.8A/Ph, 12.5kW 380V, 60Hz, 3P+N+E, 18.9A/Ph, 12.5kW 380V, 50Hz, 3P+N+E, 18.9A/Ph, 12.5 kW 400-415V, 50Hz, 3P+N+E, 17.4A/Ph, 12.5 kW 400-415V, 50Hz, 3P+N+E, 11A/Ph, 8kW

ELECTRICAL CONNECTION WIRE CONDUCTOR SIZES

1P+N+E/Gnd 6AWG/10mm² Copper T75 min 3P+E/Gnd 10AWG/6mm² Copper T75 min 3P+N+E/Gnd 12AWG/4mm² Copper T75 min

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 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. Check that the available power supply is correct to that shown on the rating plate located on the right-hand side panel.

208V, 60Hz, 1P+N+E, 53.7A, 11.2 kW 220V, 50Hz, 1P+N+E, 56.8A, 12.5 kW 220-240V, 60Hz, 1P+N+E, 52.0A, 12.5 kW 230-240V, 50Hz, 1P+N+E, 52.0A, 12.5 kW 208V, 60Hz, 3P+E, 31A/Ph, 11.2 kW 220V, 50Hz, 3P+E, 33A/Ph, 12.5 kW 220-240V, 60Hz, 3P+E, 50.7A/Ph, 12.5 kW 220V, 60HZ, 3P+E, 32.8A/Ph, 12.5kW 380V, 60Hz, 3P+N+E, 18.9A/Ph, 12.5kW 380V, 50Hz, 3P+N+E, 18.9A/Ph, 12.5 kW 400-415V, 50Hz, 3P+N+E, 17.4A/Ph, 12.5 kW 400-415V, 50Hz, 3P+N+E, 11A/Ph, 8kW

LOCATION

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

Rear 0mm / 0“ Left-hand side 0mm / 0” Right-hand side 75mm / 3.0”

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.

Bench Mounting

For bench mounted applications the oven must be fitted with 100mm / 4inch feet.

Floor Mounting

For floor mounted applications the oven must be fitted with 150mm / 6 inch legs.

Note:

Four 100mm/4 inch or 150mm/6 inch adjustable legs are available separately from your E35 dealer as an optional extra.

Stand Mounting

Ovens that are to be mounted on stands do not require feet or legs. Refer to Appendix B for stand mounting instructions.

Avoid having heat producing equipment such as fryers or steamers adjacent to the right-hand side of oven.

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

Remove side cover panel to allow access to the terminal block and strain relief cable clamp. The cable can be fitted through the entry grommet and secured from strain by tightening the fitted strain relief bushing. Connect cable to the terminals as marked. Refit cover panel.

IMPORTANT: FIXED WIRING

INSTALLATIONS MUST INCLUDE AN

ALL-POLE DISCONNECTION SWITCH.

Refer to specifications section for wire connections required, and supply connection conductor sizes.

IMPORTANT: THE OVEN VENT LOCATED ON THE CABINET TOP MUST NEVER BE OBSTRUCTED.

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WATER CONNECTION

A cold water supply should be fitted to the water

inlet (

/4” BSP hose connection) which is located

on the rear of the right hand side of the unit.

Alternately, a connection elbow and sealing washer is supplied with this unit for direct connection of a

/2” ID hose, which is

recommended for easy installation and service.

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.

DOUBLE STACKING UNITS

When it is desired to mount an E35 Turbofan oven on an E85 prover, a double stacking kit must be used. Available from your dealer or Turbofan distributor. (see Spare Parts).

When mounting one oven on top of another, a double stacking kit is also required.

For stacking kit assembly instructions, refer to Appendix A.

RACK WIDTH POSITIONS

The E35 models have an adjustable rack width setting. This allows for the racking to be configured for 405mm/16” or 460mm/18” wide baking sheets/pans or racks.

Position the side racks in their innermost position for 16” trays and in their outermost position for 18” trays.

Removal of Side Racks (as illustrated)

1) Lift the side rack off the bottom locating pins.

2) Move bottom of rack toward centre of oven.

3) Lower rack to clear top locating pins, and remove.

Replacement of Side Racks

1) Insert rack into the oven, placing the appropriate holes over the top locating pins.

2) Lift the side rack over the bottom locating pins.

3) Lower rack with appropriate holes over bottom locating pins.

RATING PLATE LOCATION

The rating plate for the E35 convection oven is located at the bottom left corner of the RH side panel. An internal rating plate is also located behind the RH side panel on the vertical dividing panel behind the electrical contactors. (Units manufactured from July 2002).

Internal Rating Plate

Figure 2.3

Rating Plate

Locating Stud

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Figure 2.2

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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. VENT

Oven vent closed (incorporates over-

pressure relief when closed).

Oven vent open (light illuminates).

2. THERMOSTAT

Temperature range 60 - 280°C / 100 - 550°F. (Light illuminates when elements are cycling ON to maintain set temperature).

3. TIMER

1 Hour bake timer. (Light illuminates when “time up” (0) reached, and buzzer sounds).

4. STEAM BUTTON

Push button to activate automatic steam dose into oven chamber. (Light illuminates when button activated for duration of steam cycle).

5. FAN SPEED

HI Full fan speed (Star point connection on

motor).

LO Half fan speed (Delta point connection

on motor).

6. POWER

O UNIT IS OFF

I UNIT IS ON (Light illuminates when

switched to this position). Oven lights operate continuously. Fan starts after 10 seconds when door

closed.

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3.2 EXPLANATION OF CONTROL SYSTEM

The E35 Turbofan convection oven features multi-function operator controls, and a combined fan motor and steam control system.

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:

Circuit Protection

All models are fitted with a 3 pole circuit breaker, from which a control circuit is taken from L1 circuit breaker, and this control circuit is fitted with a 6A circuit breaker. The 3 pole main circuit breakers are rated 25A/pole for 3P+N+E/GND and 1P+N+E/GND supply models, and 40A/pole for 3P+E/GND (no neutral) models. These provide control circuit protection via the 6A circuit breaker, and load circuit protection via the 3 pole circuit breakers.

Additionally, the 3 pole circuit breaker is mechanically connected to a Shunt Trip breaker, which in the event of the oven fan motor overheating will trip the 3 pole circuit breakers to isolate power from the unit. The Shunt Trip is directly connected to thermal limit switches in the motor windings, and the supply Neutral (or L3 on 3 phase, no neutral models). A supply from the 6A control circuit breaker is connected to the motor thermal switches. Should any of the motor windings overheat, the thermal switches close and supply power to the Shunt Trip, which in turn trips (triggers) and mechanically trips the 3 pole circuit breaker.

Accordingly, causes of circuit breakers tripping can be ascertained with the above knowledge, and this is covered in more detail in the Fault Diagnosis section.

Power On/Off

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

An integral cooling fan, behind the control panel used to keep the electrical controls of the oven cool, is on continuously whenever the power supply to the oven is on. Switching the oven control panel Power switch off will leave the cooling fan running.

With the Power switch ON (illuminated neon indicator), power is supplied to all operator controls.

Oven Lamps

The two oven lamps (12 volt halogen) are on whenever the Power switch is on. The oven lamps are supplied with 12 volts from an electronic lamp transformer fitted on the oven’s control switchgear assembly. The oven lamps are on with the oven door open and closed.

Bake Timer

The 60 minute bake timer is a mechanical timer and can therefore be operated with the oven’s power ON or OFF. However only with the oven’s power switch On and the oven door closed will the timer turn on the time-up buzzer and time-up indicator neon 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 the timer is independent of the temperature control, heating, fan, or steam system.

Oven Vent

The oven vent is a manual operation by way of the Vent knob on the control panel.

The vent knob directly rotates the vent shaft through 90 degrees to open and close the vent. The vent shaft passes through a rotary switch mounted behind the control panel and this switch is used to switch on or off the Vent indicating neon. In the vent open position the indicator is illuminated. The oven vent restricts venting of the oven when in the closed position, however the vent flap is fitted with a spring loaded over-pressure flap which relieves excess pressure created during oven steaming. This avoids steam pressure escaping out of door seals etc, if the oven is steamed with the vent closed. The spring pressure on the over-pressure vent flap ensures that only excess steam is lost out of the vent.

Door Switch

The oven has a door switch, mechanical micro-switch below oven opening, which breaks the power supply to the oven fan, temperature, and steam control circuits when the door is opened. Additionally, opening the oven door will remove power from the Bake Timer buzzer and indicator, and the vent position indicator neon.

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This allows only the oven lights to be operational if the oven door is opened.

Thermostat Control

Heating of the oven is controlled by an electronic thermostat control, comprising of a potentiometer dial and knob on the control panel, a temperature sensing probe (thermistor type) in the oven chamber, and the thermostat control board behind the control panel. Power to the electronic thermostat is supplied through an over-temperature/hi limit thermostat. Accordingly a failure of the electronic thermostat control causing a temperature over-run will result in the over-temperature thermostat switching and removing power from the heating control circuit. The over-temperature thermostat is able to be manually reset, however a serviceman is required to perform this function, as removal of the R/H service panel is required to access this safety protection device.

The electronic thermostat when set to a temperature will illuminate the heating neon indicator on the control panel whenever the oven heating elements are on. When the indicator neon goes out, the oven is up to the set temperature.

Heating / Elements

The electronic thermostat when requiring heating of the oven, switches power to the heating contactor (referred to as C1 contactor in this manual). The heating contactor closes to supply power through to the heating elements in the oven. In all ovens all 3 poles of the contactor are used to supply L1, L2, and L3 phase circuits to the 3 heating elements on each side of the oven fan motor.

On 3 Phase + Neutral supply models, all 6 elements are looped to neutral, and the 3 Phase power to the elements is to each set of three elements in parallel connection. Hence each of the elements is supplied with the Phase to Neutral voltage.

On 3 Phase supply models (no neutral), the set of three elements each of the fan motor are connected in Delta configuration, which each element being supplied the Phase to Phase voltage.

On 1 Phase + Neutral supply models, all 6 elements are looped to neutral, and the 1 Phase power to the elements is split into three poles at the main circuit breakers on the oven, then feed through the three poles of the heating contactor, from where each pole is connected to two of the six elements in parallel. Hence each of the

elements is supplied with the Phase to Neutral voltage.

The heating elements are rated at 2000 Watts each, therefore providing a total of 12000 Watts or 12kW of heating.

In some cases special heating kilowatts may be supplied to special request, so always check rating plate information on the unit if in doubt.

The heating contactor cycles ON/OFF as controlled by the thermostat to maintain set oven temperature.

Fan / Motor

The E35 Turbofan ovens use a dual speed, bi-directional oven fan circulation system, in order to provide even heat distribution through the oven, and fan speed control to suit different product types.

To provide both dual fan speed and bi-direction, a motor of 4pole/8pole configuration is used.

Fan / Motor Direction

The direction change is made by swapping two phases to the motor through the motor contactors C2 and C3. In one direction L1, L2, and L3 are switched through motor contactor C2 with motor contactor C3 open. In the alternate direction, motor contactor C2 is open, and C3 is closed. L1 and L2 are reversed on the C3 contactor connections. Motor contactors C2 and C3 are mechanically interlocked (interlock fitted to rear of contactors) to prevent any switching overlap.

Motor direction change is automatic, and the duration of the direction cycle is factory set. Additionally, a dwell period between at each change of direction occurs to allow the motor to restart in the opposite direction only after the motor rotation has slowed down. This is necessary to avoid motor overheating due to the high current load that would be required to change direction instantaneously.

Each direction cycle is 90 seconds long, at the beginning of which is a preset 10 second dwell/ delay. As the dwell is at the beginning of the cycle, the fan always has a 10 second start delay when the oven is first turned on, or when the door is closed after opening.

The direction control timing is provided from three electronic timers mounted below the motor contactors on the electrical switchgear panel of the oven. Timer T1 controls the direction cycle time, timer T3 controls the dwell for one direction, and timer T5 controls the dwell for the opposite direction.

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When the door is closed and power is ON, cycle timer T1 will switch power to dwell timer T3 for 90 seconds. Timer T3 will then switch power through to motor direction contactor C2 after the preset 10 second delay. The motor will then run for the remainder of the 90 second cycle.

At the completion of the 90 second cycle, cycle timer T1 will switch the power from T3 dwell timer to T5 dwell timer. This T3 dwell timer will then switch power through to the other motor direction contactor (refer previous) after the preset 10 second delay, and the motor will run in the opposite direction for the remainder of that 90 second cycle. At the completion of that cycle the cycle timer T1 switches power back to the other dwell timer, and this continues until the oven door is opened, or the power is turned off.

Fan / Motor Speed

For HI speed operation the motor is run as a 4 pole motor. (1420 rpm 50Hz/1750 rpm/60Hz) For LO speed operation the motor is run as an 8 pole motor. (715 rpm 50Hz/850 rpm/60Hz)

Selection of the pole configuration for run speed is made though the motor contactors C4, C5 and C6.

In HI speed setting the motor contactors C4 and C6 close, C4 switching power to the motor on the 4 pole connection leads, and C6 binding 4 of the 8 motor poles to allow motor to run as a 4 pole motor.

In LO speed setting the motor contactor C5 closes to switch power to the motor on the 8 pole connections leads, with contactors C4 and C6 remaining open.

Motor contactors C5 and C6 are mechanically interlocked (interlock fitted to rear of contactors) to prevent any switching overlap between LO and HI speed changes.

The motor speed control is by manual operation of the Fan Speed switch on the control panel. This rotary switch simply supplies power to either motor contactors C4 and C6 for HI speed, or C5 for LO speed. The contactors stay closed in the selected setting unless the oven door is opened. Closing the oven door allows the contactors to switch on again.

Fan / Motor - Single Phase Models

The operation of the fan motor on single phase E35 models is the same as other three phase models for two speed and bi-direction operation, except for the electrical circuit required.

On single phase models the same motor is used as on three phase models, but with capacitors in

the motor circuit to create an artificial phase lag, that is normally part of the three phase supply on three phase models. Use of the three phase motor is required to retain the bi-direction operation.

On single phase models the L1 supply to the motor connects to the normal L1 connection of the motor, and the Neutral supply connects to the normal L2 (as connected on three phase models) connection of the motor. A capacitor is then connected to the normal L3 (as connected on the three phase models) connection of the motor, and this capacitor is supplied power from the L1/ Phase supply. This capacitor is referred to as the Run capacitor as it is permanently in the circuit during motor operation. Each motor on single phase models has two run capacitors, one for the LO speed operation (lower capacitance) and one for the HI speed operation (higher capacitance). Each Run capacitor is only used when the motor is running at that speed setting.

Additionally a Start capacitor is also fitted on single phase models, and is used for starting the motor rotation at the beginning of each direction change when in HI speed setting only. This capacitor is switched on for approximately 7 seconds only at the beginning of each motor start up, with a contactor C7 switching the Start capacitor on and off, and with a timer T6 controlling the timing of the contactor C7.

Fan direction change in single phase models is still controlled by motor contactors C2 and C3. However unlike three phase models where C2 and C3 swap phases over to change motor start rotation/direction, single phase models use C2 and C3 to switch the run capacitor form the L1 supply to the Neutral supply for direction change.

Control of the motor cycle timing and dwell timing is the same as three phase models.

Motor Protection

Refer Circuit Protection at start of section.

Steam System

The E35 Turbofan ovens feature an automatically timed oven chamber steaming system, that allows operators to inject a 10 second period of steam into the oven at any stage. The steam is generated when a solenoid valve opens and supplies mains water to a calibrated wide spray angle nozzle in the oven that discharges the water as a fine spray into the oven fan. The fine spray at a wide angle is then immediately thrown by the fan circulation across the oven heating elements either side of the fan. The fine spray instantaneously turns to steam on

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the hot elements, which is supported by the hot air of the oven also turning the water droplets into steam.

The steam is initiated by depressing the Steam switch on the control panel. When depressed the steam switch provides power one of two Steam timers which are preset to 10 seconds steam cycle duration. These Steam timers are T2 and T4.

T2 is associated with fan dwell timer T3 and is used when steam is required during the fan direction cycle that uses the T3 dwell timer.

T4 is associated with fan dwell timer T5 and is used when steam is required during the fan direction cycle that uses the T5 dwell timer.

This ensures that steam can be used in either fan direction cycle, and additionally allows the fan to be turned on as soon as steam is activated, even if the fan was in a direction change dwell. Ensuring that the fan is running when steam is required is necessary to atomise the water droplets by the mechanical action of the fan, and by the fan throwing the water across the elements.

The Steam switch on the control panel only needs to be depressed momentarily as the duration of the steam injection is automatically timed by the steam timers. The Steam switch will illuminate for the duration of the steam injection to provide a visual confirmation of the steaming process. The light in the steam switch is independent of the switch contacts and is powered by the electrical circuit to the water solenoid valve. Therefore the switch is illuminated for as long as the water solenoid is open: 10 seconds.

Summary of Components

The electrical switchgear (not user controls) components are summarised as follows:

C1 Heating contactor Switches elements ON/OFF

C2 Motor direction contactor Phases switched in line

C3 Motor direction contactor Phases L1 and L2 swapped on 3 phase

models

Run capacitor swapped from L1 to

Neutral on 1 phase models

C4 Motor speed contactor HI speed

C5 Motor speed contactor LO speed

C6 Motor speed contactor HI speed (changes motor from 8 pole

to 4 pole)

T1 Fan cycle timer Direction cycle

T2 Steam timer For T3 dwell direction

T3 Fan dwell timer Alternate direction (always initial

direction dwell)

T4 Steam timer For T5 dwell direction

T5 Fan dwell timer Alternate direction (always 2

direction

dwell)

C7 Motor start capacitor contactor. (Single phase models only)

T6 Motor start capacitor timer (Single phase models only)

Motor contactor interlocks fitted to C2+C3 (mounted on rear on contactors)

Motor contactor interlocks fitted to C5+C6 (mounted on rear on contactors)

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.

SIDE RACKS

To remove, follow instructions given in the installation section.

OVEN DOOR (HINGED GLASS)

Outer surfaces: Clean with conventional glass

cleaners

Inner surfaces: To clean between the inner and outer door glasses, firstly ensure the door is locked shut. With a screwdriver, coin, or other suitable device, release the outer glass and allow it to be hinged open for cleaning access (refer to figure 4.1 for correct procedure).

IMPORTANT: ALWAYS ENSURE

THAT THE OUTER GLASS IS HINGED

CLOSED AND LOCKED INTO

POSITION BEFORE OPENING DOOR.

/4 turn the outer glass locks to

TOP

LOCKED

UN-LOCKED

LOCKED

BOTTOM

Figure 4.1

OVEN DOOR (HINGED GLASS)

Outer surfaces: Clean stainless steel with quality

stainless steel cleaner.

Inner surfaces: Clean stainless steel with quality stainless steel cleaner.

Door glass: Clean with conventional glass cleaners.

OVEN SEALS

To remove, pull out the seal starting at each corner. The seal may be washed in the sink, but take care not to cut or damage it. To replace, fit the seal in at the corners first, then push in the rest of the seal.

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Figure 4.2

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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

properly.

ELEMENT Check that element resistance is correct to it’s rating (refer

6.3.12).

WATER NOZZLE Check for lime build-up in water nozzle. 12 months

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 (‘0’).

Incorrect electrical supply.

Oven circuit breaker tripped.

Power switch on unit faulty.

(Fan only operates when the door is closed).

Door microswitch out of adjustment.

Door microswitch faulty.

Fan motor faulty.

Wiring.

Fan timers.

Turn on.

Turn switch to ‘I’ position.

Ensure electrical supply correct.

Identify fault. Reset circuit breaker.

Replace.

(Refer service section 6.3.1)

Close door.

Adjust.

(Refer service section 6.4.1)

Replace.

(Refer service section 6.3.3)

Replace.

(Refer service section 6.3.21)

Check and tighten any loose wiring.

Replace. (Refer service section 6.3.11)

STEAM LIGHT DOES NOT ILLUMINATE

NO STEAM

(continued next page)

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Blown bulb. Replace bulb.

Water not turned on.

Blocked filter in water solenoid.

Nozzle blocked.

Check valve blocked/corroded.

-17-

Turn water on at isolating valve.

Clean filter.

Remove, clean or replace. (Refer service section 6.3.16)

Remove check valve.

(Refer service section 6.3.15)

FAULT POSSIBLE CAUSE REMEDY

NO STEAM

(continued)

STEAMS ONLY SOMETIMES Steam timer faulty.

NO HEAT Faulty contactor.

SLOW RECOVERY Faulty contactor.

NO TEMPERATURE CONTROL

Steam tube blocked.

Faulty solenoid coil.

Steam switch faulty.

Timer faulty.

Thermostat faulty.

Element(s) blown.

Faulty door microswitch.

Faulty heating contactor.

Over-temperature control tripped.

Faulty thermostat controls.

Remove, clean or replace.

Replace. (Refer service section 6.3.16)

Replace. (Refer service section 6.3.14)

Adjust / Replace. (Refer service section 6.3.11)

Replace.

(Refer service section 6.3.11)

Replace. (Refer service section 6.3.11)

Replace. (Refer service section 6.3.8)

Replace. (Refer service section 6.3.11)

Replace. (Refer service section 6.3.12)

Adjust or replace. (Refer service section 6.3.3)

Replace. (Refer service section 6.3.11)

Reset.

Replace. (Refer service section 6.3.7)

OVER-TEMPERATURE CONTROL TRIPS

TIMER WILL NOT TIME DOWN Faulty timer.

NO TIME UP ALARM INDICATION

NO HIGH FAN SPEED

NO LOW FAN SPEED

Oven too hot, thermostat out of calibration.

Over-temp out of calibration.

Faulty timer.

Faulty buzzer.

Fan selector switch faulty.

Replace.

(Refer service section 6.3.8)

Replace. (Refer service section 6.3.13)

Replace. (Refer service section 6.3.18)

Replace.

(Refer service section 6.3.18)

Replace. (Refer service section 6.3.19)

Replace.

(Refer service section 6.3.22)

Replace. (Refer service section 6.3.22)

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FAULT POSSIBLE CAUSE REMEDY

OVEN LIGHTS NOT ILLUMINATING

Blown bulb(s).

Faulty lighting transformer.

NOTE: If both light bulbs have blown then there will be no output from the lighting transformer.

OVEN VENT INDICATOR NOT ILLUMINATING WHEN IN ‘OPEN’ POSITION

Indicator faulty.

Switch faulty.

OVER-PRESSURE VENT NOT OPERATING DURING STEAM CYCLE

Vent blocked.

Over-pressure vent mechanism restricted.

DOOR DOES NOT CLOSE Tray in way of door.

Door seal obstruction.

Door handle in wrong position.

Door setting incorrect.

Replace.

(Refer service section 6.3.4)

Replace.

(Refer service section 6.3.6)

Replace.

(Refer service section 6.3.2)

Replace. (Refer service section 6.3.23)

Remove and clean blockage.

Remove and clean.

Correctly position tray in rack.

Correctly install door seal. (Refer maintenance section)

Reposition door handle.

Adjust.

(Refer service section 6.4.3)

DOOR SEAL LEAKS Door seal damaged.

Door seal incorrectly fitted.

Replace.

(Refer maintenance section)

Correctly install door seal.

(Refer maintenance section)

RACKS DO NOT FIT Incorrect pin location. Relocate on correct pin.

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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.

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

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

6.2.2 Service Panel (RH Side Panel)........................................................................................... 22

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

6.2.4 Side Panel (LH Side) .......................................................................................................... 22

6.2.5 Control Panel Rear ............................................................................................................ 22

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

6.3.1 Power Switch ...................................................................................................................... 23

6.3.2 Indicator Neon Light............................................................................................................ 23

6.3.3 Door Microswitch ................................................................................................................ 23

6.3.4 Light Bulb / Glass................................................................................................................ 24

6.3.5 Light Fitting ......................................................................................................................... 24

6.3.6 Lighting Transformer........................................................................................................... 24

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

6.3.8 Thermostat Board ............................................................................................................... 25

6.3.9 Thermostat Probe ............................................................................................................... 25

6.3.10 Timer / Contactor ................................................................................................................ 26

6.3.11 Elements............................................................................................................................. 26

6.3.12 Over Temperature Thermostat ........................................................................................... 26

6.3.13 Steam Switch ...................................................................................................................... 27

6.3.14 Spray Nozzle ...................................................................................................................... 27

6.3.15 Check Valve........................................................................................................................ 27

6.3.16 Water Solenoid ................................................................................................................... 27

6.3.17 Cooling Fan ........................................................................................................................ 28

6.3.18 Bake Timer ......................................................................................................................... 28

6.3.19 Buzzer................................................................................................................................. 28

6.3.20 Oven Fan ............................................................................................................................ 28

6.3.21 Fan Motor ........................................................................................................................... 29

6.3.22 Fan Speed Selector Switch ................................................................................................ 29

6.3.23 Vent Switch ......................................................................................................................... 29

6.3.24 Vent / ‘Over Pressure’ Vent ................................................................................................ 29

6.3.25 Door Outer Glass ................................................................................................................ 30

6.3.26 Door Inner Glass................................................................................................................. 30

6.3.27 Door Catches ...................................................................................................................... 30

6.3.28 Door Handle........................................................................................................................ 30

6.3.29 Door Catch Mechanism ...................................................................................................... 30

6.3.30 Door Handle Mechanism .................................................................................................... 31

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6.4 ADJUSTMENT / CALIBRATION........................................................................................................ 31

6.4.1 Door Microswitch Adjustment ............................................................................................. 31

6.4.2 60 Minute Timer Zero Position Adjustment......................................................................... 31

6.4.3 Door Setting / Adjustment................................................................................................... 32

6.4.4 Door Reversal..................................................................................................................... 32

6.4.5 Fan and Steam Timer Operation / Adjustment ................................................................... 34

Fan / Steam Flow Chart...................................................................................................... 35

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