Moffat E89M-8 Service Manual

E89M / MS PROOFER AND

HOLDING CABINET

Beginning with S/N 259435

SERVICE

MANUAL

Revision 1/F3608

October, 2003

Manual P/N MOME89

CONTENTS

This manual is designed to take a more in depth look at the E89M / MS prover and holding cabinets 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....................................................................................................................................... 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 .................................................................................................................. 16

6.1 Fault Diagnosis

6.2 Access

6.3 Replacement

6.4 Adjustment / Calibration

7. ELECTRICAL SCHEMATICS ............................................................................................................ 27

8. ELECTRICAL WIRING DIAGRAMS .................................................................................................. 29

9. SPARE PARTS .................................................................................................................................. 31

10. ACCESSORIES / OPTIONS............................................................................................................... 32

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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11. PARTS DIAGRAM.............................................................................................................................. 33

11.1 Main Assembly

11.2 Control Panel Assembly (E89M)

11.3 Control Panel Assembly (E89MS)

11.4 Door Assembly (E89M)

11.5 Door Assembly (E89MS)

12. SERVICE CONTACTS........................................................................................................................ 39

APPENDIX A. Auto Water Fill Kit Instructions ........................................................................................ 41

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MODEL: E89M

1. SPECIFICATIONS

710

(28”)

515

(20

/4”)

FRONT

710

(28”)

51.5

(2”)

(22/8”)

WATER ENTRY

ELECTRICAL ENTRY

355

(14”)

200

810

(32”)

(8”)

(45/8”) (24”)

SIDE

”)

900

(35

”)

66.5

610117.5

PLAN

LEGEND

- Electrical connection entry point

- Water entry - 3/4” BSP (Autofill models only)

(

/2” ID Hose adapter supplied)

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

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MODEL: E89MS

710

(28”) (32”)

WATER ENTRY

ELECTRICAL ENTRY

355

(14”)

(8”)

200

515

(201/4”)

FRONT

710

(28”)

51.5

(2”)

(45/8”)

(22/8”)

SIDE

810

610117.5

(24”)

66.5

”)

900

(35

”)

PLAN

LEGEND

- Electrical connection entry point

- Water entry - 3/4” BSP (Autofill models only)

(

/2” ID Hose adapter supplied)

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 0mm / 0” Left-hand side 0mm / 0” Right-hand side 25mm / 1”

Provision must be allowed for the door opening.

PROVER INTERNAL DIMENSIONS

E89M / MS

Width 460mm / 18” Height 675mm / 26 Depth 700mm / 27

/8” /8”

Prover Volume 0.22m³ / 7.8ft³

PROVER RACK/PAN SIZE CAPACITY

Width 460mm / 18” or 405mm / 16” Depth 660mm / 26”

RACK POSITIONS

Spacing 74mm / 3” No. of rack positions: 8

ELECTRICAL SUPPLY SPECIFICATION OPTIONS

100-120 Volts A.C. 60 Hz, 12.5 A, 1.5kW 208-220 Volts A.C. 50/60 Hz, 6.5A, 1.45kW 220-240 Volts A.C. 50/60 Hz, 7.1 A, 1.7kW

ELECTRICAL PLUG SPECIFICATION REQUIREMENTS

Australia 3-pin 250V 10A, AS/NZ 3112 Canada 3-pin 125V 15A, NEMA 5-15 New Zealand 3-pin 250V 10A, AS/NZ 3112 United Kingdom 3-pin 250V 13A fused, BS 1363A United States 3-pin 125V 15A, NEMA 5-15 Other Countries 3-pin 250V 10A minimum, type

to meet country standards

WATER SUPPLY CONNECTION

(Autofill Models Only)

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

100-120 Volts A.C. 60 Hz, 12.5 A, 1.5kW 208-220 Volts A.C, 50/60 Hz, 6.5A, 1.45kW 220-240 Volts A.C. 50/60 Hz, 7.1A, 1.7kW

LOCATION

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

Rear 0mm / 0” Left-hand side 0mm / 0” Right-hand side 25mm / 1”

Provision must be allowed for the door opening.

ELECTRICAL CONNECTION

E89 models are supplied with pre-fitted cords. Ensure unit is fitted with 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 and strain relief clamp by removing the RH side panel.

WATER CONNECTION (AUTOFILL MODELS ONLY)

A connection elbow and sealing washer is supplied with this unit for direct connection of a ½” ID hose, and is recommended for easy installation and service.

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

Turn on water supply to check for leaks.

DOUBLE STACKING UNITS

When it is desired to mount a Turbofan E32 convection oven on an E89, a double stacking kit must be used. Available from your dealer or Turbofan distributor (see Spare Parts). For stacking kit assembly instructions, refer Appendix B.

RACK WIDTH POSITIONS

The E89 prover has been designed to accept either 460mm (18”) or 405mm (16”) wide trays, 1/1 GN,

/2 /1 GN trays or USA steam pans.

The prover comes factory set for 460mm (18”) trays, a rack spacer kit (Part no. 025685) is required to change to 405mm (16”) trays, Gastronorm pans or USA steam pans.

RATING PLATE LOCATION

The rating plate for the E89 prover is located at the bottom left corner of the RH side panel.

L1 L2

Phase

RED

BROWN

BLACK

WARNING:

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Neutral

BLACK

BLUE

WHITE

THIS APPLIANCE MUST

BE GROUNDED / EARTHED

Figure 2.1

Ground

GREEN

GREEN/YELLOW

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 - E89 PROVER / HOLDING CABINETS

1. FUNCTION

OFF Unit is off.

PROOF Unit is in proofing mode. (Indicator

illuminates when switched to this position)

HOLD Unit is in holding mode. (Indicator illuminates when switched to this position)

2. THERMOSTAT

Temperature range 0 - 85°C (32 - 185°F).

Indicator illuminates when elements are cycling ON to maintain set temperature.

Controls the prover air temperature.

3. HUMIDITY CONTROL

1 to 5 Setting for butter based pastries (croissants, Danish pastries etc.)

5 to 8 Settings for yeast based breads and doughs.

Indicator illuminates when elements are cycling ON to maintain set temperature.

(Controls the cabinet humidity in PROOF mode only)

Manual Water Fill Models: Open the prover door. Fill the water trough at the filling spout, located at the front of the right hand side rack, to approximately 20mm / ¾” from the top of the trough. Remember to top up the water trough when the water level is below the halfway level in the trough and before the heating element is exposed.

Auto Water Fill Models: Check that the water trough is filling, and the heating element is well covered.

4. THERMOMETER

Indicates cabinet temperature. Dual Centigrade and Fahrenheit scale.

CONDENSATION CHANNEL

Below the door there is a condensation channel and removable water collection drawer for the purpose of collecting door condensation run-off.

P R

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3.2 EXPLANATION OF CONTROL SYSTEM

The E89M/MS Prover/Holding Cabinets feature operator controls and an electrical circuit for which a direct understanding of their operation is required before carrying out any service work or fault repair work. The control device functions and electrical circuit are explained as follows:

Function Switch

A rotary switch on the control panel of these models functions as the power On/Off switch of the unit by isolating the Line 1 phase supply. This switch is a 3 position, 4 pole, multi-function switch which in the Off position opens circuits all poles and isolates power from all control and heating systems. The switch should operate as illustrated below.

P1 – No function / not used. P2 – Additional air heating element. P3 – Humidity control thermostat. (Auto-fill models only - water solenoid, float switch, solenoid relay) P4 – Air heating thermostat, cabinet lights, air circulation fan motor and control panel power indicator.

The air circulation fan, cabinet lights and control panel power indicator are On continuously on all E89 models when the function switch is in either of the PROOF or HOLD positions. 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.

Proof Mode

In the ‘Proof’ position the function switch poles P1, P3 and P4 are closed, supplying power to the dry heat circuit, humidity circuit, cabinet lights and fan.

3P3

OFF PROOF HOLD

PROOF

P3 3

PWR

P4 4

HOLD

P3 3

PWR

P4 4

Figure 3.2.1

The proofing system controls air temperature and humidity levels by way of an air heating element and a water tank heating element.

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 cycle Off with the thermostat to indicate when the temperature reaches set point. The main thermostat is adjustable up to 85°C (185°F).

The humidity thermostat mounted on the control panel controls the water tank heating element, which in turn maintains the water temperature between 20°C (68°F) and 85°C (185°F). The evaporation of the water provides the cabinet humidity. The setting of the humidity thermostat (between 1 - 8) controls the rate of water evaporation and therefore the level of humidity 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 to the water tank heating element, which is 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.

Hold Mode

When the function switch is turned to the ‘Hold’ position the function switch pole P3 opens to turn off the humidity control circuit, and pole P2 closes to connect an additional air heating element to the air temperature thermostat circuit. In this mode the air temperature thermostat operates as it does in the proofing mode, however, in this case there is an additional air heating element switched On and Off to provide extra heating power in this mode. The additional air heating element is also mounted in the air circulation ducting.

E89M/MS Prover/Holding Cabinets are provided with a thermometer dial on the control panel to

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provide an indication of the cabinet temperature. The sensing bulb of this thermometer dial is mounted next to the sensing bulb of the main thermostat inside the cabinet.

Auto water fill (option)

E89 Auto-Water fill models provide for a mains cold water supply connection for automatic water tank filling and level control. Non Auto-Water fill models require the operator to manually fill the water tank and maintain the water tank level as the water evaporates through operation.

On Auto-Water fill models an electric solenoid valve, float switch and relay maintain the water level in the humidity tank. The float switch is mounted at the rear of the water tank, and when the water is below the full level it open circuits, removing power from the coil. When deenergised, the relay removes power from the humidity thermostat circuit (therefore switching off the humidity element), and switches power to the water solenoid. As the water level reaches the full level position the float switch contact will close, re-energising the water solenoid relay, thereby closing the water solenoid valve and providing power back to the humidity thermostat. Accordingly this system will automatically maintain a full water tank whenever the function switch is in the “PROOF” position and the mains water supply is turned on.

Ensuring that the function switch is in the Off position is necessary whenever removing the water tank for cleaning as when the water tank is removed the float switch drops and the water solenoid valve will open (if the unit is on). Therefore as a precaution the mains water supply should also be turned Off whenever removing the water tank.

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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

Wash with warm water and detergent solution using a soft sponge in straight lines up and down the door.

Rinse with clean, warm water to remove detergent. Dry off.

Clean door seal with warm water and detergent solution using a soft sponge when required.

WATER TROUGH

Open 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 ‘8’ and run for approximately 30 minutes. Remove trough and clean element with damp cloth when cooled. Wash out trough and refit.

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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4.2 ROUTINE PROCEDURES

PROCEDURE INTERVAL

WET ELEMENT Remove scaling (refer section 4.1). As required

DOOR SEALS Inspect door seal on door inside for wear and tear. 6 months

DOOR HINGES Check for wear. 12 months

ELEMENTS Check that elements are operating. 12 months

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