Moffat E85-12HLD Service Manual

E85 PROOFER CABINETS

E85HLD PROOFER / HOLDING CABINETS

SERVICE

MANUAL

Revision 4/F3517

October, 2003

Manual P/N M0ME85

CONTENTS

This manual is designed to take a more in depth look at the E85 prover and E85HLD prover / 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 thos e special cases where thes e settings are required to ch ange, 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 - E85 Models

3.2 Description of Controls - E85HLD Models

3.3 Explanation of Control System

4. MAINTENANCE............................................................................................................. 13

4.1 Cleaning

4.2 Routine Procedures

5. TROUBLE SHOOTING GUIDE.....................................................................................15

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

6.1 Fault Diagnosis

6.2 Access

6.3 Replacement

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

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

9. SPARE PARTS.............................................................................................................. 33

10. ACCESSORIES / OPTIONS.......................................................................................... 34

11. PARTS DIAGRAM ........................................................................................................ 35

11.1 Main Assembly (N on HLD Only)

11.2 Main Assembly (HLD Only)

IMPORTANT: MAKIN G ALTERATIONS MAY VOI D WAR R ANTIES AND APPROVA LS.

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11.3 Control Panel Assembly (Non HLD Only)

11.4 Control Panel Assembly (HLD Only)

12. SERVICE CONTACTS..................................................................................................43

13. APPENDIX A. Stacking Kit Instructions.................................................................... 45

14. APPENDIX B. Auto Water Fill Kit Instructions ......................................................... 47

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1. SPECIFICATIONS

MODEL: E85-8, E85A-8, E85-8HLD, E85A-8HLD

880

(34.6)

FRONT

150

(5.9)

880

(34.6)

SIDE

902

(35.5)

(1.6)

PLAN

LEGEND

- Electrical connection entry point

- Water entry - ¾” BSP (Autofill models only)

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

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MODEL: E85-12, E85A-12, E85-12HLD, E85A-12HLD

880

(34.6)

FRONT

150

(5.9)

880

(34.6)

SIDE

1145

(45.1)

(1.6)

PLAN

LEGEND

- Electrical connection entry point

- Water entry - ¾” BSP (Autofill models only)

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 E85-8

Width 460mm / 18” Height 700mm / 27

/8” Depth 660mm / 26” Prover Volume 0.21m³ / 7.5ft³

E85-12

Width 460mm / 18” Height 945mm / 37

/4” Depth 660mm / 26” Prover Volume 0.29m³ / 10.1ft³

PROVER RACK/PAN SIZE CAPACITY

Width 460mm/18” or 405mm/16” Depth 660mm/26” or 760mm/30”

RACK POSITIONS Number - E85-8: 8

- E85-12: 12 Spacing 76mm/3”

ELECTRICAL SUPPLY SPECIFICATION OPTIONS

100-120 Volts A.C. 60 Hz, 14.5 A, 1.6kW 220-240 Volts A.C. 50 Hz, 7.2 A, 1.65kW

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 25 0V 15 A, NEM A 6-1 5 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 th at t he pr oof er is ins t al led 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 f or dam age and repor t any damage to the c arrier and dealer . Repor t any deficiencies to your dealer. Check that the available power supply is correct to that shown on the rating plate l ocated on the righthand side panel.

100-120 Volts A.C. 60 Hz, 14.5 A, 1.6kW 220-240 Volts A.C. 50 Hz, 7.2 A, 1.65kW

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

E85 models are suppli ed with pre-fitte d cords. Ensure unit is f itted with corr ect cord an d 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.

DOUBLE STACKING UNITS When it is desired to mount a Turbofan E35

convection oven on an E 85, a dou ble stack ing kit must be used. Available from your dealer or Turbofan distrib utor (see Sp are Parts ). For stacking kit assembly instructions, refer Appendix A.

NOTE:

United Kingdom and USA/Canada models are supplied with a top panel fitted. Other country models are pre-fitted with the double stacking kit on the proofer for direct stacking under E35 convection ovens.

RACK WIDTH POSITIONS

The E85 models have an adjustable rack width setting. This a llo ws f or the rac king to be configured for 405mm / 16” or 460 / 18” wide baking sheets/pans or racks.

To set width remove right hand side rack. Unscrew and remove four thumbscrews at bottom and top of c abin et. For 16” wi de tra ys, turn the rack supports s uch that they face the left side of the proofer. For 18” trays, turn the rack supports to the right of the proofer.

16” trays

18” trays

Figure 2.2

RATING PLATE LOCATION The rating plate f or the E85 prover is located

at the bottom left corner of the RH side panel.

L1 L2

Phase

RED

BROWN

BLACK

WARNING:

BE GROUNDED / EARTHED

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Ground

Neutral

BLACK

BLUE

WHITE

THIS APPLIANCE MUST

Figure 2.1

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 - E85 PROVERS

1. POWER O UNIT IS OFF I UNIT IS ON (Ind icator illu minates when

switched to this position)

2. THERMOSTAT Temperature range 25 - 40°C (75 - 105°F). Indicator illuminates when elements are

cycling ON to maintain set temperature.

Controls the proofer air temperature.

3. HUMIDITY CONTROL (Indicator illuminates when water tank

elements are cycling ON to maintain set humidity).

Controls proofer humidity. LO - Humidity setting for bu tter bas ed pastr ies

(croissants, Danish pastries etc). MED / HI - Humidity setting for yeast based

breads and dough.

WATER Manual Water F ill Models: Open the proof er

door. Fill the water tank at the filling spout, located at the front of the r ight h and side rac k , to approximately 20mm / ¾” from the top of the tank. Rem ember to top up t he water ta nk when the water level is below the halfway level in the tank and before the heating element is exposed.

Auto Water Fill Mo dels: Check that the water tank is filling, and the heating e lement is well covered. Unit must be switched on f or water tank auto-fill system to operate.

CONDENSATE PAN (Auto water fill models only)

A pan is provided on guides underside the cabinet for the collec tion of cabinet and door condensation. Where provided, remove the drain plugs in the cabinet floor centre and door condensate channel below the door, to allow condensate collection in the pan. Remove the pan daily for emptying.

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3.2 DESCRIPTION OF CONTROLS - E85HLD PROVER/HOLDING CABINETS

1. FUNCTION OFF Unit is off. PROOF Unit is in proofing m ode. (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 - 80°C (32 - 176°F). Indicator illuminates when elements are

cycling ON to maintain set temperature. Controls the proofer air temperature.

3. HUMIDITY CONTROL Proofing function only, redundant in hold

mode. (Indicator illuminates when elements are cycling ON to maintain set humidity).

Controls proofer humidity. LO - Humidity setting for bu tter bas ed pastr ies

(croissants, Danish pastries etc). MED / HI - Humidity setting for yeast based

breads and dough.

4. THERMOMETER

Dual Centigrade and Fahrenheit scale. Indicates cabinet temperature.

WATER Manual Water F ill Models: Open the proof er

Auto Water Fill Mo dels: Check that the water tank is filling, and the heating e lement is well

covered

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CONDENSATE PAN (Auto water fill models only)

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3.3 EXPLANATION OF CONTROL SYSTEM

The E85 Prover and Prover/Holding Cabinets feature operator controls and an electrical circuit for which a d irect un derstand in g of their operation is required before carrying out any service work or f ault repair work . The control device functions and electrical circuit are explained as follows:

A rotary switch on the control panel of thes e models functions as the p ower On/Off switch of the unit by isolating the Line 1 phase supply.

E85 Prover onl y models thi s s witch is a 2 pole device, with 1 pole isolating power to the air circulation fan motor and the other pole isolating power to the water tank heating element controls and the dry heat ing element controls.

On E85HLD Prover/Holding Cabinet models this switch is a 3 position, 4 pole, multifunction switch whic h in t he O ff pos itio n o pens circuits all poles and isolates power from all control and heating systems .

In the ‘Proof’ position poles P3 and P4 are closed, operating the electrical circuit functions as follows:

P3 – Humidity control thermostat P4 – Air heating thermostat, air circulation

motor and control panel power indicator.

In the ‘Hold’ funct ion positi on pole P 4 rem ains closed, pole P3 opens to isolate the humidit y control, and pole P2 c loses. Power to pole P2 is fed from the air heating thermostat and switches power thr ough to the addit ional hold heating element.

With both E85 Prover and E85HLD Prover/ Holding Cabinets this power and power function switch wil l also switch p ower on Auto water-fill models to the water solenoid switching relay.

The air circulation fan and control panel power indicator are On continuously on all E85 models when the power or power/function switch are in an On position.

The proofing system operates on all models, controls air temperature and humidity levels by way of an air heating element control led 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 circulati on ducting inside the cabinet and is direc tly 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 indic ator lig ht on th e control panel above this therm ostat will illuminate when th e 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 heati ng element controlled b y the humidity level thermostat mounted t o the control panel is used to heat the water tank water and maintain the 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 . Sh ould t he water tank level drop bel ow the heating elem ent the humidity thermostat will cycle Off due to the sensing bulb reacting to th e radiated heat off the heating element and will prevent the humidity water tank heating element burning out through excessive temperature.

E85 Auto-Water fill models provide for a mains cold water supply connection for automatic water t ank filling and le vel c ontrol. NonAuto water-fill m odels 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 water

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solenoid, 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 below the full water level position, it open c ircuits, re moving po wer from the relay coil, and therefore allowing power through the normally closed contact of the relay to energise the water solenoid. As the water reaches the full level position the float switch will close circuit, energising the relay and therefore removing power from the normally closed position of the relay, thus turning off the water solenoid.

Ensuring that the power or power function switch is in the Off position is necessary whenever removing the removable water tank for cleaning, as when the water tank is removed the float switc h drops and the water solenoid valve will be ope ned if the electrical circuit is switched On. Therefore as a precaution the mains water supply should also be switched Off whene ver removing the water tank.

E85HLD Prover/Holding C abinets are able to be operated both as a proof ing cabinet and as a holding cabinet.

As explained in earlier paragraphs, when th e power function switch on these models is selected to the ‘Hold’ position the humidity control circuit is turned Off and an additional air heating element is connected into the air temperature thermostat circuit. In this mode the air temperature t hermostat operates as it does in the proofing mode, however, in this case there is an addit ional air he ating e lem ent switched On and Of f to provide extra heating power in this m ode. The additional air heating element in these models is also mounted in the air circulation ducting.

E85HLD Prover/Holding Cabinets are also provided with a thermometer dial on the control panel to provide an indication of the cabinet temperature and the sensing bulb of this thermometer dial is mounted next to the sensing bulb of the m ain ther m ostat inside th e cabinet.

On E85 Prover only models the main thermostat is adjustable up to 40°C (105°F) whereas on E85HLD Prover/Holding Cabinet models the main thermostat is adjustable up to 80°C (175°F).

With both models butter b ased products such as croissants and dan is h p as tr ies s ho uld have the cabinet proofing temperature set around

the 25° C (77° F) as higher proofing temperatures will cause t he butter to melt out of the product. F or yeast based doughs an d breads the proofing temperature should be set higher at around 40°C (105°F) in order to activate the yeast in these products. On E85HLD models temperatures higher than this are used for holding food at required serving temperatures and the thermometer dial on the control panel of these models is provided to indicate and verify the actual cabinet temperature and assist with the thermostat setting.

On all models the air circulation fan mounted at the top of the air delivery ducting ensures that the temperature and h umidity throughout the cabinet is ev en by creating a lo w velocity air circulation system throughout the prover cabinet. This system overcomes the natural occurrence of hot air rising and therefore higher humidit y and temperature in the upper positions of the cabi net as f ound with pro ofing 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 .

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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 T O 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, tak e hold of the centre rung and

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

DOOR

Wash with warm water and det ergent solut ion using a soft sponge in straight lines up and down the door.

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

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 o n. Set hum idity co ntrol to ‘Hi’ and run for approximately 30 minutes. Remove trough and cle an element with dam p 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

(E85HLD models only) DOOR HINGES Check for wear. 12 months

ELEMENTS Check that elements are operating. 12 months

Inspect door seals on door inside for wear and tear. 6 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 UNIT DOES NOT OPERATE / START

PROOFING OR HOLDING MODE NOT WORKING (E85HLD models only)

FAN DOES NOT OPERATE Faulty fan motor.

NO HEAT Thermostat faulty.

NO TEMPERATURE CONTROL

The unit is not plugged into the wall socket.

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

The power switch on the unit is off.

Incorrect electrical supply.

(Refer fault diagnosis 6.1.1)

Power switch faulty (E85).

(Refer fault diagnosis 6.1.1)

Function switch faulty (E85HLD)

(Refer fault diagnosis 6.1.1)

Power / selector switch faulty.

(Refer fault diagnosis 6.1.2)

(Refer fault diagnosis 6.1.3)

(Refer fault diagnosis 6.1.2)

Function switch faulty (E85HLD)

(Refer fault diagnosis 6.1.2)

Element blown.

(Refer fault diagnosis 6.1.4)

Faulty thermostat.

(Refer fault diagnosis 6.1.5)

Plug in.

Turn on.

Depress switch. Switch will illuminate.

Ensure electrical supply correct.

Replace.

(Refer service section 6.3.2)

Replace.

(Refer service section 6.3.2)

Replace. (Refer service section 6.3.2)

Replace. (Refer service section 6.3.8)

Replace.

(Refer service section 6.3.3)

Replace.

(Refer service section 6.3.2)

Replace.

(Refer service section 6.3.5)

Replace.

(Refer service section 6.3.3)

NO HUMIDITY No water in trough.

(Manual fill models) Auto-fill system faulty.

(Auto-fill models only) Faulty thermostat.

(Refer fault diagnosis 6.1.6)

Function switch faulty (E85HLD)

(Refer fault diagnosis 6.1.2)

Water tank element blown.

(Refer fault diagnosis 6.1.6)

NO HUMIDITY CONTROL Faulty thermostat.

(Refer fault diagnosis 6.1.7)

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Fill trough with water.

(Refer Fault: Auto-fill not working)

Replace.

(Refer service section 6.3.4)

Replace.

(Refer service section 6.3.2)

Replace.

(Refer service section 6.3.6)

Replace.

(Refer service section 6.3.4)

FAULT POSSIBLE CAUSE REMEDY

SLOW RECOVERY Overloading of product.

Door opened unnecessarily. Electrical supply incorrect.

Door seals deteriorated. (E85HLD models only)

Fan motor faulty.

(Refer fault diagnosis 6.1.3)

NO HEATING / HUMIDITY INDICATOR

DOOR DOES NOT CLOSE Tra y in way of door.

AUTOFILL WATE R NOT FILLING (Autofill models only)

AUTOFILL WATER OVERFLOWING (Autofill models only)

Indicator faulty.

(Refer fault diagnosis 6.1.8)

Interference with door. Hinges damaged.

Water supply not turned on. Blockage in water supply.

Water connection filter blocked. Water solenoid faulty.

(Refer fault diagnosis 6.1.9)

Solenoid relay faulty. (Refer fault diagnosis 6.1.9)

Water level float switch faulty. (Refer fault diagnosis 6.1.9)

Solenoid relay faulty. (Refer fault diagnosis 6.1.9)

Water tank not fitted.

Reduce batch size. Do not open unnecessarily. Check supply voltage is as per

rating plate voltage. Inspect and replace.

Replace. (Refer service section 6.3.8)

Replace.

(Refer service section 6.3.1)

Correctly position tray in rack . Inspect and repair. Replace.

(Refer service section 6.3.10) Turn water supply on.

Disconnect water supply and inspect.

Clean filter. Replace.

(Refer service section 6.3.14) Replace.

(Refer service section 6.3.13)

Replace.

(Refer service section 6.3.15)

Replace.

(Refer service section 6.3.15)

Replace.

(Refer service section 6.3.13)

Fit water tank.

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