Garland Mealstream Bedienungsanleitung

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 1

CAUTION MICROWAVE EMISSIONS

DO NOT BECOME EXPOSED TO EMISSIONS FROM THE MICROWAVE GENERATOR

OR PARTS CONDUCTING MICROWAVE ENERGY

Mealstream

SERVICE

SERVICE MANUAL

ALL CTM3 MODELS & TIM HORTON'S COMBINATION OVEN

MANUFACTURED FROM JANUARY 2003

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 2

Microwave safety precautions................................................. 3

Safety code ............................................................................. 4

Product specifications ............................................................. 5

Installation instructions............................................................ 6

Main features ....................................................................... 7-8

Principal components: LHS..................................................... 9

Principal components: RHS .................................................. 10

Principal components: Top.................................................... 11

Principal components: Back view.......................................... 12

Principal components: door, roof and heater element .......... 13

Principal components: Cavity Parts & External Panels......... 14

Principal components: Electronic control panel assembly .... 15

Principal components: Tim Hortons Control panels .............. 16

Principal components: ( not shown in main views ) ............. 17

Principal components: Input wiring details ............................ 18

Principal components: Part no. identification charts ........19-21

Procedure for Microwave leakage test ............................. 22-23

Procedure for Power output measurement ........................... 24

Procedures for Principal Component tests ...................... 25-26

Procedure for Door interlock adjustment and test ..........27-29

Procedure for building and fitting the door ....................... 30-34

Procedure for replacing door seal assembly.................... 35-36

Procedure for removing shelf runners & element cover........ 37

Procedure for replacing Heater Element............................... 38

Procedure for replacing Hot air Motor assembly................... 39

Procedure for replacing Magnetron assembly ................. 40-41

Procedure for Testing Membrane panel circuit ................ 42-43

Circuit diagrams ..............................................................44-47

Error codes and diagnostics.................................................. 48

Appendix 1: Test Procedure for Tim Hortons........................ 49

Appendix 2: MenuKey® Download procedure ...................... 50

Appendix 3: Temperature Sensor resistance data................ 51

Manual corrections and modifications................................... 52

TABLE OF CONTENTS

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 3

CAUTION

WARNING TO SERVICE TECHNICIANS

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING

SERVICING TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with the door open.

(b) Make the following safety checks on all ovens to be serviced before

activating the magnetron or other microwave source , and make repairs

as necessary:

1) interlock operation.

2) proper door closing.

3) seal and sealing surfaces (arcing, wear, and other damage).

4) damage to or loosening of hinges and latches.

5) evidence of dropping or abuse.

within the microwave generating compartments, check the magnetron,

wave guide or transmission line, and cavity for proper alignment,

integrity and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door

seal, and microwave generation and transmission systems shall be

repaired, replaced, or adjusted by procedures described in this manual

before the oven is released to the owner.

(e)(i) A microwave leakage check to verify compliance with the Federal

Performance Standard should be performed on each oven prior to

release to the owner. For U.S.A.

(e)(ii) A microwave leakage check to verify compliance with the Canadian

Regulation, HEALTH AND WELFARE, SOR/79 920 should be

performed on each oven prior to release to the owner. For CANADA.

MICROWAVE SAFETY

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 4

This manual is designed to assist engineers who have been on a recognised product

familiarisation and training course run by Garland. It has been prepared to offer technical

guidance for the Mealstream range of Combination Microwave Ovens.

Please remember that it is wiser not to attempt a service task if you are unsure of being able to

complete it competently, quickly, and above all safely.

To avoid injury to yourself, and to protect the appliance from possible damage, please follow this

Safety Code when servicing these ovens.

Before attempting to repair the oven, check it for microwave leakage.

Check that the oven is not emitting microwaves, even when supposedly not in

operation.

Check that the oven is not operating continuously, whether the display indicates

cooking or not.

Always discharge the HT capacitors before working on the oven using a suitably

insulated 10 MΩResistor.

Before removing any covers from the oven, do all of the following.

• Switch off the mains supply and remove the plug from the wall socket.

• If the oven is hard wired, ensure that the power is turned off at the isolator switch.

Note:

The On/Off switch on the oven is not adequate protection against electric

shock, as it does not isolate all of the internal wiring from the mains.

Upon completion of a service on a Mealstream oven, or before reconnecting the appliance to the

electrical supply for testing, check all of the following points:

• All internal electrical connections are correct (see wiring diagram Page 44-47).

• All wiring insulation is correct and is not touching a sharp edge.

• All grounding connections are electrically and mechanically secure.

• All door safety interlocks are secure and mechanically sound.

• The door operation is smooth, and the arms run freely in the slots.

• The door activates all three of the door interlock switches in the correct order

(see pages 27-29).

• The temperature sensor is correctly connected to the Power PCB.

Before finishing a service call, recheck the following points:

• All of the electronics are functioning correctly, and all of the touch pads are working.

• Microwave emissions are below permissible limit - 4 mW/cm².

• The power output of the oven is checked in accordance with page 24.

• Oven has correct 2 inch ( 50mm ) air gap all round and 2 inch ( 50mm ) above.

Air flow should not be restricted. (see page 6).

SAFETY CODE

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 5

Power

Requirements

208Volts

240Volts

208V ac 60Hz 30Amp 2P & G

240V ac 60Hz 40Amp 2P & G

Power Output Microwave 100%

Convection

Combination

1425W

3000W

1425W + 3000W

External

Dimensions

Height

Width

Depth

30 inches ( 765mm )

29.5 inches ( 770mm )

25 inches ( 635 mm)

Manufacturers

recommended

clearances

Height

Width

Depth

32 inches ( 815 mm )

31.5 inches ( 795 mm )

27 inches ( 685 mm)

Internal

Dimensions

Height

Width

Depth

Capacity

10.2 inches ( 260mm )

19.3 inches ( 490mm )

14.2 inches ( 360mm )

1.62 ft³ ( 45.86 litres )

Weight Nett

Gross packed

198 lb.s ( 90 kg )

227 lbs ( 103 kg )

Construction Cavity

Casework

304 Stainless Steel

Settings Microwave

Temperature

Timer

Programs

100%,75%,50%,25%, Convection only

Off, 300°F, 350°F, 400°F, 440°F, 480°F

Up to 30 minutes per stage

Cook Programs can have 3 cooking stages of up to 30

minutes for each stage

Model Number: + Voltage + Frequency + Phases + Controls + Country

Model No. CTM3

Voltage 208V 20

240V 24

Frequency 50Hz 50

60Hz 60

Phases Single 1

Three 3

Control Type Series 5 S5

UK UK

N.America A

Customer Variant N.America TH = Tim Hortons

Country

PRODUCT SPECIFICATIONS

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 6

Installation Instructions for Mealstream Combination Ovens

Power Supply Requirements

The Mealstream Series should be connected to a suitable electricity supply, which can cope

with the switching-on surge that occurs with certain types of catering equipment, including

microwaves. Because of this requirement, we strongly recommend that a separate, suitably

rated supply is installed for the oven.

The supply for the oven should be fitted with a Type "C" or Time Delay circuit breaker,

rated at:

50 Amp for 208V electrical supply ( 2PH + GND )

50 Amp for 240V electrical supply ( 2PH + GND )

30 Amp for 208V electrical supply ( 2PH + GND )

30 Amp for 240V electrical supply ( 2PH + GND )

If the oven is hard-wired to the supply, a double-pole isolator switch with a contact gap of at

least 1/8 inch ( 3 mm ) should be fitted.

32ins

31.5ins

16ins

27ins

Positioning the Oven

In order to maintain adequate ventilation for air intake

and exhaust, and to allow access for cleaning filters,

you must allow a minimum of 2 inches ( 50 mm )

clearance at the sides and rear of the oven,

and at least 2 inches ( 50 mm ) above.

Air intake temperature should not exceed 110°F/45°C

excessive temperature will lead to reduced operating

duty cycle, or premature ageing of internal components.

Failure to comply with these conditions will invalidate

the warranty.

Note:

The minimum recommended

clearance required for air flow

Grounding requirement

This appliance must be connected to a grounded, metallic, permanent wiring system, or an

equipment grounding conductor should be run with the circuit conductors and connected to the

equipment grounding terminal or lead on the appliance.

INSTALLATION INSTRUCTIONS

NEVER Install an oven above fryers,

grills, griddles or any other

major heat source.

NEVER Stack machines on top of

each other. Always use a

double stand or a separate

shelf.

ALWAYS Place containers in the cavity

carefully - impact damage

may chip the vitreous enamel

coating on the runners and

baffle plate.

Canada models

US models

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 7

On/Off SWITCH

This is used to turn the oven On or Off.

IT DOES NOT ISOLATE INTERNAL

WIRING FROM THE MAINS SUPPLY.

EXHAUST VENTS

Allows exhausted air from the magnetron

cooling system to escape.

OVEN CAVITY

The oven cavity is mainly constructed

from stainless steel panels. It must be

kept clean.

BAFFLE PLATE

Forms the inside rear of the oven and

covers the hot air circulation fan. This

must be cleaned on a regular basis, and

kept free of debris.

RUNNERS

These are mounted on each side of the

oven cavity to support the rectangular

racks or oven trays.

HOT AIR FAN

Situated behind the baffle plate, and

circulates the hot air through the baffle

plate, over the heating element, and around

the edge of the baffle plate back into the

cavity.

RATING PLATE

The rating plate is situated on the rear of

the oven, and states the Model, Serial

Number, Electrical Ratings and

Manufacturers telephone number.

DOOR

The door consists of a thermally insulated

inner section, and an additional air gap

provided by a twin skinned door front to

lower the surface temperature.

DOOR SEAL

ELECTRICAL SUPPLY CORD

Electrical supply cord is situated on the rear

of the oven,

AIR FILTER

Main intake for cooling air for internal

components. Must be clear of obstructions.

MAIN FEATURES

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 8

a Stage LED's

b Program & Time Display

e Convection Pad

f Power Pads

g Time / Preset Pads

h Temperature Set Pads

i Cancel / Callback Pad

j Program Pad

N Menukey™

a b

Electronic control panel

h e

MAIN FEATURES

a b

K Preheat

L Cancel

M Icon Cook Pads

N MenuKey™

O Quarter, Half & Full Batch Load

Tim Hortons control panel

KEY

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 9

Left side

No Description 208V 240V

1 Fuse holder 30Z0231 30Z0231

1A Fuse 10 amp 30Z0217 30Z0217

2 Fuse holder 30Z0231 30Z0231

2A Fuse 10 amp 30Z0217 30Z0217

3 Fuse holder 30Z0285 30Z0285

3A Fuse 1 amp 30Z0957 30Z0957

4 Fuse holder 30Z1178 30Z1178

4A Fuse 20 amp 30Z1177 30Z1177

5 Fuse holder 30Z1178 30Z1178

5A Fuse 20 amp 30Z1177 30Z1177

6 Electrical supply terminal block 31Z0149 31Z0149

7 Filter ( Heater circuit ) 30Z0997 30Z0997

8 Filter ( Microwave circuit ) 30Z0997 30Z0997

9 Door spring (short type) 520000 520000

10 Door arm stop assembly 11C0279 11C0279

11 Microswitch ( Primary ) 30Z0240 30Z0240

12 Door hinge assembly ( LH )B11C0167 11C0167

13 Door arm assembly 11C0300 11C0300

14 Microswitch ( Monitor ) 30Z0240 30Z0240

9 Door spring( Long )A40C1141 40C1141

Note B

See page 17

for parts

PRINCIPAL COMPONENTS

Note A

Ovens after

June 2003

Mealstream Ovens Pt. No. 32Z3403 Issue 15

Page 10

Right side

1918

No Description 208V 240V

15 Door arm assembly 11C0300 11C0300

16 Door hinge assembly ( RH )B11C0166 11C0166

17 Micro-switch ( Secondary ) 30Z0240 30Z0240

18 Door arm stop assembly 11C0279 11C0279

19 Door spring 520000 520000

20 Steam pipe 40C1023 40C1023

21 Steam vent guard 790061 790061

22 Temperature sensor 50E123 50E123

90 Cavity Vent Pipe 40C1013 40C1013

59 Rubber stop 31Z1150 31Z1150

95 Diode Board assy. with leads 11M0325 11M0325

19 Door spring( Long )A40C1141 40C1141

PRINCIPAL COMPONENTS

Note B

See page 17

for parts

Note A

Ovens after

June 2003

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