Blodgett CTBR WENDYS Service Manual

CTB & CTBR

ELECTRIC CONVECTION OVEN

SERVICE AND REPAIR MANUAL

BLODGETT OVEN COMPANY

www.blodgett.com

44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone (802) 658Ć6600 Fax: (802)864Ć0183

PN 36277 Rev D (7/02)

Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.

TABLE OF CONTENTS

1. INTRODUCTION

Oven Specifications 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Specifications 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. ASSEMBLY

Stand Assembly 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oven Assembly to Stand 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Legs and Casters 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. OPERATION

Sequence of Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cook Only - 19031 rev A 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solid State Digital - 33285 rev F 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intelliplus, Intellihold or Intellirack - 21448 rev E 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blodgett IQ - 33237 rev C 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Infinite with Pulse Plus - 21062 rev A 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Two Speed with Integrated Control - 21535 rev D 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Triple Setpoint Thermostat - 22817 rev C 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Schematics 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cook Only 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solid State Digital 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intelliplus, Intellihold or Intellirack 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blodgett IQ 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Infinite with Pulse Plus 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Two Speed with Integrated Control 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Triple Setpoint thermostat 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. CALIBRATION AND ADJUSTMENT

Thermostat 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solid State Manual 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solid State Digital Control 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intellihold and Intelliplus Controls 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intellitouch Control 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blodgett IQ Control 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blodgett IQ2T Control Factory Level Programming 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IQ VVCĆ208 Control 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heating Elements Resistance 4-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe Resistance vs Temperature 4-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. TROUBLESHOOTING

Heat System 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Error Codes 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intellitouch 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intellihold and Intelliplus 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Blodgett IQ Control 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS

6. PARTS REPLACEMENT

Door 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Door Interlock Switch 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Window Assembly 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Element 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Motor 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHAPTER 1

INTRODUCTION

CTB and CTBR

OVEN SPECIFICATIONS

Cooking in a convection oven differs from cooking in a conventional deck or range oven since heated air is constantly recirculated over the product by a fan in an enclosed chamber. The moving air continĆ ually strips away the layer of cool air surrounding the product, quickly allowing the heat to penetrate. The result is a high quality product, cooked at a lower temperature in a shorter amount of time.

Blodgett convection ovens represent the latest adĆ vancement in energy efficiency, reliability, and ease of operation. Heat normally lost, is recircuĆ lated within the cooking chamber before being vented from the oven: resulting in substantial reĆ ductions in energy consumption and enhanced oven performance.

OVEN COMPONENTS

Heating Elements - located on the side of the

oven, the elements provide heat to the baking chamber on electric ovens.

Control Panel - contains wiring and components to control the oven operation.

Oven Racks - five racks are provided standard. Additional racks are available.

Rack Supports - hold oven racks.

Blower Wheel Cover - located on the side interior

wall of the oven. Protects the blower wheel.

Blower Wheel - spins to circulate hot air in the baking chamber.

Convection Motor - provides power to turn the blower wheel.

CTB CTBR

FIGURE 1

1-1

ELECTRICAL SPECIFICATIONS

INTRODUCTION

Wiring diagrams are located in the blower comĆ partment area.

Ovens are supplied for operation in several voltage choices, single or three phase grounded circuits.

The electric motor, indicator lights and related switches are interconnected through the one powĆ er source supplied to the oven.

KW/Section Volts Phase

60 HZ UNITS

5.6 208 1 27 - 27 - 8

5.6 208 3 24 12 15 - 10

5.6 220Ć240 1 24 -24- 8

5.6 220Ć240 3 21 11 14 - 10

8.0 208 1 35 -35- 6

8.0 208 3 22 20 21 - 10

1. The supply conduit enters through the rear of the oven and electrical block secured to the perforated panel at the back of the control compartment.

THE BLODGETT OVEN COMPANY CANNOT ASĆ SUME RESPONSIBILITY FOR LOSS OR DAMAGE SUFFERED AS A RESULT OF IMPROPER INSTALĆ LATION.

Amperes

L1 L2 L3 N

Electrical

onnection

AWG*

8.0 220Ć240 1 32 -32- 6

8.0 220Ć240 3 20 18 19 - 10

50 HZ UNITS

5.6 208 1 27 - 27 -

5.6 220-240 1 24 --24

8 220-240 1 35 --35

5.6 220/380 3 10 882

8 220/380 3 14 12 12 2

5.6 240/415 3 10 773

8 240/415 3 13 11 11 2

5.6 230/400 3 9 881

8 230/400 3 13 11 11 2

NOTE: *Electric connection wiring is sized for 90_C copper wire at 125% of rated input. NOTE: Double units can have phase loads partially equalized by matching lines during hookĆup. OtherĆ

wise, CTBĆDouble or CTBRĆDouble load ratings are twice the above data.

Size per

local codes

1-2

CTB and CTBR

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1-3

CHAPTER 2

ASSEMBLY

CTB and CTBR

STAND ASSEMBLY

STAND OPTIONS

Small Stands Without Shelves

D The 5Ć3/4" (15cm) stand is used for a single

oven, when short legs are required for counterĆ top use.

D The 7" (18cm) stand is used for a double

stacked oven, when the oven is to be located on the floor.

Stands With Shelves

D Three stands, 16" (40cm), 19" (48cm), and 24"

(61cm) are available for different installation reĆ quirements.

D The 33" (84cm) stand is used for a single oven

when counter space is limited.

Open Stands With Racks

D The 24" (61cm) or 33" (84cm) open stands are

available with a rack support system located below the oven.

STAND ASSEMBLY

Small Stands Without Shelves

1. Place stand frame upside down on a work surĆ face.

2. Attach one leg to each of the corner stud bolts on the bottom of the stand top.

3. Place a lock washer and nut on each stud, and tighten securely.

4. The stand is now ready for the oven assembly.

Stands With Shelves

1. Place stand frame upside down on a work surĆ face.

2. Attach one leg to each of the corner stud bolts on the bottom of the stand top.

3. Place a lock washer and nut on each bolt, and tighten. DO NOT tighten leg bolts completely.

4. Place the shelf between the legs so that the smooth top surface is facing the top of the stand.

5. Align the shelf holes with the bolt holes found near the bottom of each leg.

6. Insert a carriage bolt from the outside of the leg, through the leg, and through the shelf corĆ ner bracket.

7. Place a lock washer and nut on each bolt, and tighten securely.

8. Tighten the leg frame bolts.

FIGURE 2

1-1

Open Stands With Racks

1. Lay stand frame top down on the floor as shown. See FIGURE 3.

ASSEMBLY

6. Place a lock washer and nut on each bolt, and tighten securely.

2. Position the four leg assemblies and support angles as shown. Attach with the 5/16Ć18 nuts provided. DO NOT tighten leg bolts completely.

NOTE: Be sure the support angles and clips

are located correctly for your oven conĆ figuration. See FIGURE 3.

3. Position the bottom shelf between the legs so that the smooth top surface is facing the top of the stand.

4. Align the shelf holes with the bolt holes found near the bottom of each leg.

5. Insert a carriage bolt from the outside of the leg, through the leg, and through the shelf corĆ ner bracket.

CTB

Back of Stand

Rack Stop

Support

Angle,

Support

Angle, LH

Rack Support

7. Repeat Steps 3-6 for the top shelf.

NOTE: Be sure the slots in the top shelf are

aligned with the support angles.

8. Insert the top of the rack stops into the two back clips on the angle supports as shown. InĆ sert the bottom of the rack stops into the slots in the top shelf as shown.

9. Insert the rack supports into the remaining four clips on the angle supports as shown. Insert the bottom of the rack supports into the slots in the top shelf as shown.

10. Tighten all loose bolts.

CTBR

Back of Stand

Rack Stop

Support Angle, RH

Rack Support

Support Angle, LH

Support

Angle

Top Shelf (rear)

Rack Support

Attach Rack Supports and Rack Stops

FIGURE 3

1-2

CTB and CTBR

OVEN ASSEMBLY TO STAND

Single Section

1. Place the assembled stand in the location where the oven is going to be used.

2. Remove the side control compartment cover and open the front control panel of a single oven (or lower section).

3. With a tool, punch out the knockĆouts in the oven bottom near each corner.

4. Set the oven on the stand. Center it to the frame.

5. Align the front, and rear bolt holes of the oven with the bolt holes in the stand.

6. Insert a bolt and washer, from the top down through each of the 2 holes.

7. Place a nut and washer on each of the 2 bolts, and tighten securely.

8. Replace the oven's side control compartment, and close the front control panel.

NOTE: For single section ovens only. For

double stacked ovens step 8 will be completed once the ovens are stacked.

Double Section

1. Assemble the lower section to the stand as deĆ scribed. DO NOT replace the side control comĆ partment or close the front control panel.

2. With a tool, punch out the knockĆouts in the oven top of the lower oven.

3. Remove the side control compartment cover and open the front control panel of the upper oven.

4. With a tool, punch out the knockĆouts in the bottom of the upper oven near each corner.

5. Set the upper oven on the lower oven.

6. Align the front, and rear bolt holes of the upper oven with the bolt holes in the bottom oven.

7. Insert a bolt and washer, from the top down through each of the 2 holes.

8. Place a nut and washer on each of the 2 bolts, and tighten securely.

9. Replace the control compartment cover, and close the front control panel on both of the ovens.

FIGURE 4

FIGURE 5

1-3

LEGS AND CASTERS

ASSEMBLY

4" (10CM) LEG ATTACHMENT

1. Lay the oven on its side.

2. Screw one leg into each of the corner nuts.

FIGURE 6

CASTER INSTALLATION

NOTE: Casters are not supplied for the 4" (10cm)

legs, 5Ć3/4" (15cm) or 7" (18cm) stands.

NOTE: Install the locking casters on the front of the

oven. Install the nonĆlocking casters on the back of the oven.

OVEN LEVELING

After assembly, the oven should be leveled and moved to the operating location.

1. The oven can be leveled by adjusting the feet or casters located on the bottom of each leg.

ADJUSTMENTS ASSOCIATED WITH INITIAL INSTALLATION

Each oven, and its component parts, have been thoroughly tested and inspected prior to shipment. However, it is often necessary to further test or adĆ just the oven as part of a normal and proper instalĆ lation. These adjustments are the responsibility of the installer, or dealer. Since these adjustments are not considered defects in material or workmanĆ ship, they are not covered by the Original EquipĆ ment Warranty. They include, but are not limited to:

D calibration of the thermostat

D adjustment of the doors

D leveling

D tightening of fasteners.

No installation should be considered complete withĆ out proper inspection, and if necessary, adjustment by qualified installation or service personnel.

1. Insert the caster into the leg. Secure the caster to the leg by tightening the locknut.

FIGURE 7

1-4

CTB and CTBR

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1-5

CHAPTER 3

OPERATION

CTB and CTBR

SEQUENCE OF OPERATION

NOTE: The following instructions represent the most common controllers. For questions regarding other

options call the Blodgett Service Department at (800)331Ć5842.

COOK ONLY - 19031 REV A

Component Reference

NOTE: Refer to FIGURE 8 page 3-8 for compoĆ

nent locations.

1. MODE SELECTOR SWITCH

2. TIMER

3. DOOR SWITCH

4. COOK TEMPERATURE CONTROL

5. BLOWER MOTOR

6. COOK THERMOSTAT

7. COOK LIGHT

8. CONTACTOR

9. HEATING ELEMENTS

Operation

1. Power is delivered to the mode selector switch (1) on terminals L1 and N.

2. When the mode selector switch is turned to the ON position power will be delivered to terminal 1 of the timer (2), one terminal of the door switch (3) and terminal 8 of the cook temperaĆ ture control (4).

3. If the door is closed, the door switch will be closed sending power to the blower motor (5).

4. If the cook thermostat (6) is calling for heat, a switch is made between terminal 6 & 7 of the cook temperature control, sending power to the cook light (7) and the coil of the contactor (8), powering up the heating elements (9).

NOTE: The temperature probe used has an

ascending temperature coefficient.

3-1

SOLID STATE DIGITAL - 33285 REV F

OPERATION

Component Reference

NOTE: Refer to FIGURE 9 page 3-9 for compoĆ

nent locations.

1. MODE SELECTOR SWITCH

2. DOOR SWITCH

3. TIME AND TEMPERATURE CONTROLLER

4. AXIAL FAN

5. HIGH LIMIT SWITCH

6. CONTACTOR

7. HEATING ELEMENTS

8. CONVECTION FAN

Operation

1. Power is delivered to terminal N of the mode selector switch (1). The other leg of power is not interrupted and will not be discussed.

2. If the mode selector switch is closed between N and terminal 3, one leg of power will be delivĆ ered to one side of the door switch (2) terminal J8 of the time and temperature controller (3) and the axial fan (4).

3. If the door is closed, the door switch must be closed sending power to the common terminal of the time and temperature controller.

4. If a temperature is programmed in the time and temperature controller, a switch is closed beĆ tween J8 & J9 sending power to one terminal of a high limit switch 5. If the high limit switch (5) is closed, power goes to the contactor (6) closing it. Power then goes to a set of contacts powering up the heating elements (7).

5. Contacts within the time and temperature conĆ trol close between terminals common and NO sending power to the convection fan (8).

NOTE: The temperature probe used for this

application has a descending temperĆ ature coefficient.

NOTE: When the mode switch is made beĆ

tween N & 2 and L1 and 1 the oven will be in cool down.

3-2

CTB and CTBR

INTELLIPLUS, INTELLIHOLD OR INTELLIRACK - 21448 REV E

Component Reference

NOTE: Refer to FIGURE 10 page 3-10 for compoĆ

nent locations.

1. MODEL SELECTOR SWITCH

2. DOOR SWITCH

3. CONTROLLER

4. AXIAL FAN

5. CONTACTOR

6. OVEN READY LIGHT

7. CONVECTION MOTOR

Operation

1. Power is delivered to terminals 1 & N of the mode selector switch (1). If the mode selector switch is made between L1 & terminal 1 N & terminal 2, power goes to one terminal of the door switch (2), terminal E1 of the controller (3) and the axial fan (4).

2. When the door is closed, the door switch must be closed sending power to the contacts of reĆ lays E10 of K1, E11 of K2 and E6 of K3 in the controller. If the controller is powered up and set for hi or low speed then the contacts of E10 or E11 close sending power to the convection fan (7).

3. If a temperature has been programmed into the controller, the contacts within K1 close sending power to the contactor (5) and the oven ready light (6).

NOTE: The temperature probe has an ascendĆ

ing temperature coefficient.

NOTE: All components have one leg of power

as long as the appliance is turned on. The only exception is the axial fan which has both legs of potential power.

3-3

BLODGETT IQ - 33237 REV C

OPERATION

Component Reference

NOTE: Refer to FIGURE 11 page 3-11 for compoĆ

nent locations.

1. ON OFF SWITCH

2. AXIAL FAN

3. RELAY BOARD

4. TRANSFORMER

5. CONVECTION MOTOR

6. COMPUTER CONTROL

7. FOUR POLE DOUBLE THROW RELAY

Operation

1. Power is delivered to the off terminals of the on off switch (1). When the on off switch is turned to the on position, one leg of power will be deĆ livered to all of the components. The other leg of power will be interrupted by various compoĆ nents.

2. Powered is delivered to the axial fan (2), one terĆ minal of the heat relay, hi fan relay, and low fan relay located on the relay board (3), primary side of a transformer (4) and one terminal of a centrifĆ ugal switch in the convection motor (5).

3. If the computer control (6) is programmed for various functions such as high speed and 400 degrees F, the heat relay on the relay board will close sending power to terminal 5 of a four pole double throw relay (7). The convection motor ramps up to speed, closing a centrifugal switch, completing a circuit to the coil of the four pole double throw relay, causing a switch to be made between terminals 9 and 5 of the same relay. When this switch is toggled, power goes to the coil of a mercury contactor closing its switches and powering up the heating eleĆ ments.

NOTE: The four pole double throw relay also

allows for a small current to pass through it proving to the control that the motor is spinning. If the motor does not spin, the centrifugal switch does not close and the current is not able to reĆ turn to the control. The control sees this as a fault condition and displays a motor error.

NOTE: The temperature probe used has an

ascending temperature coefficient.

NOTE: The cool down feature can only be actiĆ

vated by closing the door then activatĆ ing the cool down switch. The door can be opened after the motor reaches speed. The door switch will also actiĆ vate a fault condition if the door is opened during operation.

3-4

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