Moffat E87 Service Manual

E87 PROOFER

SERVICE

MANUAL

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CONTENTS

This manual is designed to take a more in depth look at the E87 prover 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

3.2 Explanation of Control System

4. MAINTENANCE .............................................................................................................10

4.1 Cleaning

4.2 Routine Procedures

5. TROUBLE SHOOTING GUIDE ......................................................................................12

6. SERVICE PROCEDURES ..............................................................................................14

6.1 Fault Diagnosis

6.2 Access

6.3 Replacement

7. ELECTRICAL SCHEMATICS ........................................................................................20

8. ELECTRICAL WIRING DIAGRAMS ..............................................................................21

9. SPARE PARTS ..............................................................................................................22

10. ACCESSORIES / OPTIONS ..........................................................................................23

11. PARTS DIAGRAM .........................................................................................................24

11.1 Main Assembly

11.2 Control Panel Assembly

12. SERVICE CONTACTS ..................................................................................................27

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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MODEL: E87

1. SPECIFICATIONS

FRONT

710

(28.0)

(1.95)

SIDE

770

(30.3)

150

(5.9)

890

(35.0)

130

(5.1)

PLAN

LEGEND

- Electrical connection entry point

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

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LOCATION

To ensure correct operation the following minimum installation clearances are to be adhered to:

Rear: 25 mm / 1” Left-hand side: 25 mm / 1” Right-hand side: 25 mm / 1”

PROVER INTERNAL DIMENSIONS

Width: 460 mm / 18” Height: 610 mm / 24” Depth: 660 mm / 26” Oven Volume: 0.19 m³ / 6.5 ft³

PROVER RACK SIZE

Width: 460 mm / 18” Depth: 660 mm / 26”

No. of rack positions: 8 Rack position spacing: 75 mm / 3”

ELECTRICAL SUPPLY SPECIFICATION OPTIONS

100-120 V AC 60 Hz, 12.5 A, 1.5 kW @ 120 V 220-240 V AC 50 Hz, 7.5 A, 1.8 kW @ 240 V

ELECTRICAL PLUG SPECIFICATION REQUIREMENTS

Australia 3-pin 250V 10A, AS/NZ 3112 Canada 3-pin 250V 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 250V 15A, NEMA 6-15 Other Countries 3-pin 250V 10A minimum, type

to meet country standards

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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 prover 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 castors which are packed inside the unit. Check that the available power supply is correct to that shown on the rating plate located on the right-hand side panel.

220-240 V AC 50 Hz, 7.5 A, 1.8 kW @ 240 V 100-120 V AC 60 Hz, 12.5 A, 1.5 kW @ 120 V

LOCATION To ensure correct operation the following

minimum installation clearances are to be adhered to:

Rear 25mm / 1” Left-hand side 25mm / 1” Right-hand side 25mm / 1”

ELECTRICAL CONNECTION

E87 provers are supplied with pre-fitted cords. Ensure unit is fitted with correct cord and plug for the installation (refer to the specifications section).

Should changing of the cord be necessary, gain access to the electrical connection terminal block and strain relief clamp by removing the control panel.

ASSEMBLY OF CASTORS

1. Remove the castors from inside the prover.

2. Remove side racks and water trough.

3. Lift and place the prover onto its back. Attach the two swivel castors (with brake) to the front of the prover with the screws provided. Attach the two rigid castors to the rear.

4. Lift the prover onto its castors and refit the water trough and side racks.

DOUBLE STACKING UNITS When it is desired to mount a Turbofan

Countertop Convection Oven on an E87 prover, a double stacking kit may be used. Available from your dealer or Turbofan distributor (see Spare Parts). When mounting one prover on top of another, a double stacking kit is also required.

RATING PLATE LOCATION The rating plate for the E87 prover is located

at the bottom left corner of the RH side panel.

Rating Plate

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Figure 2.2

Figure 2.1

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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 25 - 40°C (75 - 105°F). Light illuminates when elements are cycling ON to maintain set temperature. Controls the prover air temperature.

3. HUMIDITY CONTROL

(Light illuminates when elements are cycling ON to maintain set humidity). Controls prover humidity. LO - Humidity setting for butter based pastries (croissants, Danish pastries etc). MED / HI - Humidity setting for yeast based breads and dough.

WATER Open the prover door. Fill the water trough to the halfway level in the trough front filling snout, located on the right hand side. Remember to top up the water trough when the level is below the front snout.

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3.2 EXPLANATION OF CONTROL SYSTEM

The E87 Prover has a power On/Off switch on the control panel and isolates power to the humidity and heating fan and light circuits when switched Off. When switched On the switch will illuminate to indicate that the unit is On and operational. The air circulation fan is On continuously on all E87 models when the power switch is in an On position.

The proofing system operates on all models, controls air temperature and humidity levels by way of an air heating element controlled by a mechanical bulb and capillary thermostat and a water tank heating element controlled by a mechanical bulb and capillary thermostat.

The air heating element is positioned in the bottom of the air circulation ducting inside the cabinet and is directly controlled by the user-adjustable thermostat mounted to the control panel. The thermostat sensing bulb is mounted inside the cabinet to control the cabinet air temperature to the control panel setting. An indicator light on the control panel above this thermostat will illuminate when the thermostat has the air heating element operating and will cycling Off with the thermostat to indicate when the temperature reaches set point.

The water tank heating element controlled by the humidity level thermostat mounted to the control panel is used to heat the water tank water and maintain water tank temperature between 50°C (122°F) and 80°C (176°F). This water tank temperature is controlled by the humidity level thermostat setting between the adjustments of low and high humidity. The evaporation rate of the water in the water tank dependent on its temperature, provides humidity into the cabinet and accordingly the setting of the humidity thermostat controls the rate of evaporation and therefore the humidity level in the cabinet.

An indicator light on the control panel above the humidity dial illuminates when the water tank element is On, and cycles Off when the thermostat switches the heating element Off to provide an indication of the humidity control. The sensing bulb of the humidity thermostat is mounted directly on the water tank heating element which are both

immersed in the water tank. Should the water tank level drop below the heating element the humidity thermostat will cycle Off due to the sensing bulb reacting to the radiated heat off the heating element and will prevent the humidity water tank heating element burning out through excessive temperature.

E87 models require the operator to manually fill the water tank and maintain the water tank level as the water evaporates through operation.

With all E87 models butter based products such as croissants and danish pastries should have the cabinet proofing temperature set around 25°C (77°F) as higher proofing temperatures will cause the butter to melt out of the product, and for yeast based doughs and breads the proofing temperature should be set higher at around 40°C (105°F) in order to activate the yeast in these products.

On all models the air circulation fan mounted at the top of the air delivery ducting ensures that the temperature and humidity throughout the cabinet is even by creating a low velocity air circulation system throughout the prover cabinet. This system overcomes the natural occurrence of hot air rising and therefore higher humidity and temperature in the upper positions of the cabinet as found with proofing units without forced air circulation.

The user-adjustable thermostat and humidity controls are required to allow adjustment of cabinet temperature and humidity levels for the variations of temperature and humidity that different product types require.

Two cabinet illumination lights are provided in the E87 models and these 15 watt each incandescent filament lamps are On whenever the control panel power switch is switched on.

To prevent the formation of condensation on the aluminium frame around the front of the cabinet and to assist in minimising the condensation occurring on the door frame and door glass inner face a resistance wire heating element is fitted into the cabinet aluminium extrusion frame. This heating wire is on whenever the power switch is switched on and will heat the aluminium frame to a warm-to-touch temperature.

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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.

CABINET A good quality stainless steel cleaning

compound is recommended for cleaning the inside and outside of the cabinet. Harsh abrasive cleaners may damage the surface.

SIDE RACKS To remove, take hold of the centre rung and

lift towards the prover top. To replace, hold horizontally, engage in holes and push down.

DOOR

Open the door and lift up off its hinges. Wash with warm water and detergent solution using a soft sponge.

To refit the door, simply fit onto its hinges.

WATER TROUGH

Remove right hand side rack and remove trough. Clean with warm, soapy water. Rinse thoroughly.

WATER TROUGH ELEMENT When the element becomes limed / scaled,

remove water trough and clean. Replace water trough and half fill with white vinegar or acetic acid then fill to the normal level with water. Switch unit on. Set humidity control to ‘Hi’ and run for approximately 30 minutes. Remove trough and clean element with damp cloth when cooled. Wash out trough and refit to unit.

This procedure is recommended to be done once a week. Frequency of cleaning the element may be increased or decreased depending on the lime depositing on the element.

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