Blodgett CTBR Installation Manual
CTB & CTBR
ELECTRIC CONVECTION OVEN
SERVICE AND REPAIR MANUAL
BLODGETT OVEN COMPANY
www.blodgett.com
44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183
PN 36277 Rev D (7/02)
Duplication of the information i n this manual is prohibited without the consent of the Blo dgett Service Depa rtment.
E 2001 --- G.S. Blodgett Corporation All rights reserved.
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 --- 1 1...................................................................
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...............................................................
Heating Elements Resistance 4---11......................................................
ProbeResistancevsTemperature 4---11..................................................
5. TROUBLESHOOTING
Heat System 5 --- 1.....................................................................
Display Error Codes 5 --- 3..............................................................
Intellitouch 5 --- 3...................................................................
Intellihold and Intelliplus 5---3.......................................................
Blodgett IQ Control 5 --- 3............................................................
i
TABLE OF CONTENTS
6. PARTS REPLACEMENT
Door 6 --- 1............................................................................
Door Interlock Switch 6 --- 1.............................................................
Window Assembly 6 --- 1............................................................
Element 6 --- 2.........................................................................
Motor 6 --- 2...........................................................................
ii
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 continually 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 advancement in energy efficiency, reliability, and
ease of operation. Heat normally lost, is recirculated within the cooking chamber before being
vented from the oven: resulting in substantial reductions 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 --- h o ld o v e n r a c k s .
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 w heel.
CTB CTBR
FIGURE 1
1 --- 1
ELECTRICAL SPECIFICATIONS
C
INTRODUCTION
Wiring diagrams are located in the blower compartment 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 power source supplied to the oven.
KW/Section Vol ts Phase
60 HZ UNITS
5.6 208 1 27 --- 27 --- 8
5.6 208 3 24 12 15 --- 10
5.6 220-240 1 24 --- 24 --- 8
5.6 220-240 3 21 11 14 --- 10
8.0 208 1 35 --- 3 5 --- 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 ASSUME RESPONSIBILITY FOR LOSS OR DAMAGE
SUFFERED AS A RESULT OF IMPROPER INSTALLATION.
Amperes
L1 L2 L3 N
Electrical
onnection
AWG*
8.0 220-240 1 32 --- 3 2 --- 6
8.0 220-240 3 20 18 19 --- 10
50 HZ UNITS
5.6 208 1 27 --- 27 ---
5.6 220--- 240 1 24 --- --- 2 4
8 220--- 240 1 35 --- --- 3 5
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: Doubleunitscan havephaseloadspartiallyequalized by matching lines during hook-up. Other-
wise, CTB -Double or CTBR-Double 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 5-3/4” (15cm) stand is used for a single
oven, when short legs are required for countertop 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 s tands, 16” (40cm), 19” (48cm), and 24”
(61cm) are available for different installation requirements.
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. Placestandframeupsidedownonaworksurface.
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. Placestandframeupsidedownonaworksurface.
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 corner 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. Positi on the four leg assemblies and support
angles as shown. Attach with the 5/16-18 nuts
provided. DO NOT tighten leg bolts completely.
NOTE: Besurethesupportanglesandclips
are located correctly for your oven configuration. 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 corner bracket.
CTB
Back of Stand
Rack Stop
Support
Angle,
RH
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. Insert 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 S h elf
(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 knock-outs 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
througheachofthe2holes.
7. Place a nut and w asher 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 . Fo r
double stacked ovens step 8 will be
completed once the ovens are stacked.
Double Section
1. Assemble the lower section to the stand as described. DO NOT replace the side control compartment or close the front control panel.
2. With a tool, punch out the knock-outs 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 knock-outs 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
througheachofthe2holes.
8. Place a nut and w asher on each of the 2 bolts,
and tighten securely.
9. Replace t he 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, 5-3/4” (15cm) or 7” (18cm) stands.
NOTE: Install the locking casters on the front of the
oven. Install the non-locking 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 AS SOCIATED WITH INITIAL
INSTALLATION
Each oven, and its component parts, have been
thoroughlytested and inspected prior t o shipment.
However, it is often necessary to further test or adjust the oven as part of a normal and proper installation. These adjustments are the responsibility of
the installer, or dealer. Since these adjustments are
not considered defects in material or workmanship, they are not covered by the Original Equipment 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 with 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)331-5842.
COOK ONLY --- 19031 REV A
Component Reference
NOTE: Refer to FIGURE 8 page 3 ---8 for compo-
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 temperature 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 compo-
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 delivered to one s ide 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
ofthetimeandtemperaturecontroller.
4. If a temperature is programmed in the time and
temperature controller, a switch is closed between 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 control close between terminals common and NO
sending power to the convection fan (8).
NOTE: The temperature probe used for this
application has a descending temperature coefficient.
NOTE: When the mode switch is made be-
tween N & 2 and L1 and 1 the oven will
be in cool down.
3 --- 2
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