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) E 2001 - G.S. Blodgett Corporation All rights reserved. Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.
TABLE OF CONTENTS 1. INTRODUCTION Oven Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 2. ASSEMBLY Stand Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS 6. PARTS REPLACEMENT Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Door Interlock Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Window Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Element . . . . . . . . . . . . . .
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.
INTRODUCTION ELECTRICAL SPECIFICATIONS Wiring diagrams are located in the blower comĆ partment area. 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. Ovens are supplied for operation in several voltage choices, single or three phase grounded circuits. THE BLODGETT OVEN COMPANY CANNOT ASĆ SUME RESPONSIBILITY FOR LOSS OR DAMAGE SUFFERED AS A RESULT OF IMPROPER INSTALĆ LATION.
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CHAPTER 2 ASSEMBLY
CTB and CTBR STAND ASSEMBLY 2. Attach one leg to each of the corner stud bolts on the bottom of the stand top. STAND OPTIONS Small Stands Without Shelves D D 3. Place a lock washer and nut on each stud, and tighten securely. The 5Ć3/4" (15cm) stand is used for a single oven, when short legs are required for counterĆ top use. 4. The stand is now ready for the oven assembly. Stands With Shelves The 7" (18cm) stand is used for a double stacked oven, when the oven is to be located on the floor. 1.
ASSEMBLY Open Stands With Racks 1. Lay stand frame top down on the floor as shown. See FIGURE 3. 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. 7. Repeat Steps 3-6 for the top shelf. NOTE: Be sure the slots in the top shelf are aligned with the support angles.
CTB and CTBR OVEN ASSEMBLY TO STAND Single Section Double Section 1. Place the assembled stand in the location where the oven is going to be used. 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. Remove the side control compartment cover and open the front control panel of a single oven (or lower section). 2. With a tool, punch out the knockĆouts in the oven top of the lower oven. 3.
ASSEMBLY LEGS AND CASTERS 4" (10CM) LEG ATTACHMENT OVEN LEVELING 1. Lay the oven on its side. After assembly, the oven should be leveled and moved to the operating location. 2. Screw one leg into each of the corner nuts. 1. The oven can be leveled by adjusting the feet or casters located on the bottom of each leg. ADJUSTMENTS ASSOCIATED WITH INSTALLATION INITIAL Each oven, and its component parts, have been thoroughly tested and inspected prior to shipment.
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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 Operation NOTE: Refer to FIGURE 8 page 3-8 for compoĆ nent locations. 1. Power is delivered to the mode selector switch (1) on terminals L1 and N. 1. MODE SELECTOR SWITCH 2.
OPERATION SOLID STATE DIGITAL - 33285 REV F Component Reference Operation NOTE: Refer to FIGURE 9 page 3-9 for compoĆ nent locations. 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. 1. MODE SELECTOR SWITCH 2.
CTB and CTBR INTELLIPLUS, INTELLIHOLD OR INTELLIRACK - 21448 REV E Component Reference Operation NOTE: Refer to FIGURE 10 page 3-10 for compoĆ nent locations. 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). 1. MODEL SELECTOR SWITCH 2. DOOR SWITCH 3. CONTROLLER 2.
OPERATION BLODGETT IQ - 33237 REV C Component Reference Operation NOTE: Refer to FIGURE 11 page 3-11 for compoĆ nent locations. 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. 1. ON OFF SWITCH 2. AXIAL FAN 3. RELAY BOARD 2.
CTB and CTBR INFINITE WITH PULSE PLUS - 21062 REV A Component Reference Operation NOTE: Refer to FIGURE 12 page 3-12 for compoĆ nent locations. 1. Power is delivered to the N terminal of the mode selector switch (1). When the Mode seĆ lector switch is set to the cook high mode, power is delivered to terminal 1 of the fan delay timer (2), terminal 7 of the solid state cook therĆ mostat (3) and the axial fan (4). 1. MODE SELECTOR SWITCH 2. FAN DELAY TIMER 3. COOK THERMOSTAT 2.
OPERATION TWO SPEED WITH INTEGRATED CONTROL - 21535 REV D Component Reference Operation NOTE: Refer to FIGURE 13 page 3-13 for compoĆ nent locations. 1. Power is delivered to Terminal N of the mode selector switch (1). If the switch is made beĆ tween N and 3, one leg of power is delivered to one side of the door switch (2), the primary side of a transformer (3), the common terminal of a single pole double throw relay (4), and the axial fan (5). 1. MODE SELECTOR SWITCH 2. DOOR SWITCH 3. TRANSFORMER 4.
CTB and CTBR TRIPLE SETPOINT THERMOSTAT - 22817 REV C Component Reference Operation NOTE: Refer to FIGURE 14 page 3-14 for compoĆ nent locations. 1. Power is delivered to various components through the mode selector switch (1). When the switch is turned to the cook position, power is delivered to one terminal of a single pole double throw cool down switch (2) and the door switch (3). 1. MODE SELECTOR SWITCH 2. COOL DOWN SWITCH 3. DOOR SWITCH 2.
OPERATION SCHEMATICS COOK ONLY 9 1 5 7 2 6 3 4 FIGURE 8 3-8 8
CTB and CTBR SOLID STATE DIGITAL 8 7 1 1 3 2 5 6 4 FIGURE 9 3-9
OPERATION INTELLIPLUS, INTELLIHOLD OR INTELLIRACK 1 1 7 6 2 5 3 4 FIGURE 10 3-10
CTB and CTBR BLODGETT IQ 1 1 9 9 2 7 3 5 9 4 7 6 FIGURE 11 3-11 9
OPERATION INFINITE WITH PULSE PLUS 1 5 1 2 7 6 7 3 9 4 8 FIGURE 12 3-12
CTB and CTBR TWO SPEED WITH INTEGRATED CONTROL 9 6 1 1 2 3 4 7 8 4 5 FIGURE 13 3-13
OPERATION TRIPLE SETPOINT THERMOSTAT 1 1 2 7 5 3 6 FIGURE 14 3-14
CHAPTER 4 CALIBRATION AND ADJUSTMENT
CTB and CTBR THERMOSTAT BULB AND CAPILLARY THERMOSTAT For units manufactured prior to August 1984 For units manufactured after August 1984. 1. Turn the mode selector/power switch to COOK ONLY. 1. Turn the selector switch to COOK. 2. Place a pyrometer thermocouple at the center of the thermostat bulb or reliable mercury therĆ mometer on the middle shelf 6" (15 cm) from the front edge and in the center of the shelf. 2. Toggle the blower switch to ON. 3. Toggle the cool down switch to MANUAL. 4.
CALIBRATION AND ADJUSTMENT For units manufactured prior to December 1987. 1. Loosen the set screws in the thermostat knob. Pull the knob forward. 2. With a screwdriver, turn the calibration screw in the center of the thermostat stem either clockwise to lower the temperature or counterĆ clockwise to raise the temperature. NOTE: Do not allow the main stem of the therĆ mostat to turn when adjusting the calĆ ibration screw. 3. Open the doors. 4. Turn the selector switch to COOL DOWN.
CTB and CTBR SOLID STATE MANUAL 1. Place a pyrometer in the center of the oven. 2. Turn the mode selector switch to cook. 3. Turn the thermostat to 350_F (177_C). 4. When the red indicator light goes out, check the pyrometer to determine oven temperature. 5. If this reading is within 10_ (6_C) of the thermoĆ stat setting no adjustment is needed. If the reading is greater than 10_ (6_C) adjust as follows: A.) Locate the trim pot on the solid state temĆ perature board. B.
CALIBRATION AND ADJUSTMENT SELECTOR SWITCH CALIBRATION 1. Place a pyrometer in the center of the oven. 5. Repeat steps 3-4 for all 8 positions. 2. Turn the mode selector switch to cook. NOTE: It is possible for all 8 positions to be out of calibration but highly unlikely. 3. Set 8 position selector switch to one of the eight positions. NOTE: The 8 individual positions are each set for a temperature of the customer's choosing.
CTB and CTBR SOLID STATE DIGITAL CONTROL SECOND LEVEL PROGRAMMING (BEFORE 8/01/2001) To Initiate Programming 1. Set the time to 1 minute (0:01 or 01:00). 2. Set the temperature to 151_F (66_C). To Access Second Level Programming 1. Press and hold the temperature key and the start/stop key simultaneously. 2. The control beeps and displays the software version for a few seconds. 3. The control then displays 2NdL. The control has entered the second level program. To Change the Temperature Offset 1.
CALIBRATION AND ADJUSTMENT SECCOND LEVEL PROGRAMMING (AFTER 8/01/2001) DISPLAY SCALE EXAMPLES DIGITS To Initiate Programming 1ST 1. Set time to 1 minute. 2ND 3RD 4TH 2. Set temperature to 151_F (66_C). To Access Second Level Programming 1. Press and hold TEMPERATURE key. 2. Press and hold START/STOP key. NOTE: Both keys should be pressed simultaĆ neously for a few seconds. 3. The control beeps and displays the software version for a few seconds. (eg 0005 ) 4.
CTB and CTBR INTELLIHOLD AND INTELLIPLUS CONTROLS 3. Press and hold the start/timer key. The display reads UPO. 4. Place a pyrometer in the center of the oven to measure the actual oven temperature. NOTE: During operation, the temperature control is based on the measured temĆ perature and the temperature offset which is programmed into the control. If the temperature measured in the center of the oven is below the oven setpoint a positive offset is needed.
CALIBRATION AND ADJUSTMENT INTELLITOUCH CONTROL NOTE: For error code display information see page 5-3 of the Troubleshooting section. NOTE: Use product keys 1Ć7 for numerals 1Ć7. Use load keys 1Ć3 for numerals 8,9 and 0 respectively. To access 2nd level programming 3. Press the enter key to save the parameter setĆ ting. 1. Turn the oven off. 2. Locate the 3 pin header on the bottom right side of the control.
CTB and CTBR BLODGETT IQ CONTROL NOTE: For error code display information see page 5-3 of the Troubleshooting section. 2ND LEVEL PROGRAMMING Entering the programming mode 1. Press the prog key. The top display reads CodE. 2. Use the product keys to enter the programĆ ming access code: 4 5 1 2. Press the enter key. The top display reads SYS. Programming hold 1. Press the scan key. The top display reads Hold. Press the toggle/clear key to toggle beĆ tween YES and no. Press the scan key. If no is chosen: A.
CALIBRATION AND ADJUSTMENT Programming the setback mode PROGRAMMING THE OFFSET 1. The top display reads SEtb. The bottom disĆ play gives the setback mode. To change the setback press the toggle/clear key. The botĆ tom display toggles between YES and no. Press the scan key. Entering the offset programming mode If no is chosen: A.) The controller advances to programming the temperature mode. If yes is chosen: A.) The bottom display gives the current setĆ back time.
CTB and CTBR BLODGETT IQ2T CONTROL FACTORY LEVEL PROGRAMMING Entering the programming mode Enabling/Disabling the fan error detection circuit 1. Press the program key. The top display reads CodE. 1. The top display reads FanC. The bottom disĆ play reads YES or NO. 2. Use the product keys to enter the factory proĆ gramming accss code: 4 5 2 3. Press the enter key. The top dislay reads Fact. 2. Press the TOGGLE/CLEAR KEY to toggle beĆ tween choices. Programming the oven configuration 3.
CALIBRATION AND ADJUSTMENT IQ VVCĆ208 CONTROL COMPONENT DESCRIPTION 1. Indicator Lights D Light up when product key is activated. 2. ProgramĆ ming Buttons D Used to access programĆ ming mode and change parameters. 3. VFD (VacuĆ um Fluorescent Display) D Bright blue for easy viewĆ ing. Displays programming and cook cycle information. 4. SlideĆIn Menu Strips D Menu items are printed directly on easyĆtoĆ change menu strip. 5.
CTB and CTBR OPERATIONAL TEST PROCEDURE 1 Plug oven into electrical source 2 Turn the oven power switch on. 3 NOTE: This scrolling can be bypassed by pressing SCAN. NOTE: AP and Mark V computer is unpowered if off. The XCEL is powered if plugged in. The controller will scroll through the following: A.) B.) C.) D.) E.) Appliance Type Software # Download # SCK Address PREHEAT" 4 The oven will enter PREHEAT" mode and begin to warm up.
CALIBRATION AND ADJUSTMENT SYSTEM PROGRAMMING (6647) KEY PRESS DISPLAY Enter Program mode 1 Enter pass code ENTER CODE **** 2 Confirm or Select Appliance Type 3 APPLIANCE TYPE (ELECTRIC HALF, ELECTRIC FULL) ACTION D To enter programming mode, press and hold the P" key for 3 seconds. D Scroll Down to Programming. D Press the P" key to lock in your entry. D The display will prompt user to enter a pass code. D Enter pass code 6 6 4 7. D Press the P" key when SysĆ tem" is displayed.
CTB and CTBR SYSTEM PROGRAMMING (continued) KEY PRESS Set Tone Level DISPLAY TONE LEVEL (None, 1, 2, 3, 4) ACTION D Press the LEFT or RIGHT arĆ row keys to select a tone level. At each level the controller will continuously sound the seĆ lected tone. D Press the P" key to lock in your entry D Press the LEFT or RIGHT arĆ row keys to select the method that all temperatures will be displayed in.
CALIBRATION AND ADJUSTMENT SYSTEM PROGRAMMING (continued) KEY PRESS Set Hold Done 11 Set Hold Fan Speed 12 Set Preheat Time 13 Exit Program Mode DISPLAY HOLD DONE (AUTOMATIC, MANUAL) HOLD FAN SPEED (HIGH, LOW) PREHEAT TIME MM:SS EXIT ACTION D Press the LEFT or RIGHT arĆ row keys to select Hold Done. D Press the P" key to advance to the next stage or parameter. D Press the LEFT or RIGHT arĆ row keys to select Hold Fan Speed. D Press the P" key to advance to the next stage or parameter.
CTB and CTBR HEATING ELEMENTS RESISTANCE Element Resistance 208 volt 12.3-13.6 W 220 volt 13.8-15.2 W 240 volt 16.4-18.
CALIBRATION AND ADJUSTMENT Intellitouch (probe P/N 20360) and Blodgett IQ Controllers (probe P/N 33074 _F Intellitouch (probe P/N 20360) and Blodgett IQ Controllers (probe P/N 33074 _C Ohms _F _C Ohms _F _C Ohms _F _C Ohms 60 16 1059 235 113 1422 410 210 1774 460 238 1872 65 18 1067 240 116 1432 415 213 1783 465 241 1882 70 21 1080 245 118 1442 420 216 1793 470 244 1892 75 24 1090 250 121 1453 425 219 1803 475 246 1901 80 27 1099 255 124 1463
CTB and CTBR Intellihold and Intelliplus Controllers (probe P/N 23392) _F Ohms _F Ohms _F Ohms _F Ohms _F Ohms _F Ohms 70 1080 108 1160 146 1239 184 1318 222 1395 260 1473 71 1082 109 1162 147 1241 185 1320 223 1398 261 1475 72 1084 110 1164 148 1243 186 1322 224 1400 262 1477 73 1086 111 1166 149 1245 187 1324 225 1402 263 1479 74 1089 112 1168 150 1247 188 1326 226 1404 264 1481 75 1091 113 1170 151 1249 189 1328 227 1406 26
CALIBRATION AND ADJUSTMENT Intellihold and Intelliplus Controllers (probe P/N 23392) _F Ohms _F Ohms _F Ohms _F Ohms _F Ohms _F Ohms 298 1550 335 1624 372 1698 409 1772 446 1845 483 1917 299 1552 336 1626 373 1700 410 1774 447 1846 484 1919 300 1554 337 1628 374 1702 411 1776 448 1848 485 1921 301 1556 338 1630 375 1704 412 1778 449 1850 486 1923 302 1558 339 1632 376 1706 413 1780 450 1852 487 1925 303 1560 340 1634 377 1708 414
CHAPTER 5 TROUBLESHOOTING
CTB and CTBR HEAT SYSTEM POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #1 - Oven heaters and motor do not run D Oven not plugged in. D Plug in oven. D Circuit breaker tripped. D D Doors not closed tightly. Reset breaker, check amp draw. Reference electriĆ cal specifications on page NO TAG of the IntroducĆ tion. D 10 amp fuse on control panel may be blown. D Close doors tightly. D Door switch inoperative. D Replace the fuse and check for shorts. D Mode selector switch inoperative.
TROUBLESHOOTING Symptom #3 - Heat system does not recover quickly D One, two or all three of the elements are bad. 208 volt = 32.8-36.4 W 220 volt = 36.8-40.6 W 240 volt = 43.6-48.4 W D Replace bank of elements. Reference electrical specifications on page NO TAG of the IntroducĆ tion for amp draw. D Dropped a phase from circuit breaker at electriĆ cal panel. D Check for voltage at the terminal block in the oven across L1-L2, L2-L3, and L1-L3. The voltage should match the supply to the building.
CTB and CTBR D Potentiometer is bad. D The potentiometer is approximately 900W and can also be tested with an ohm meter. Connect the test leads to the two outside wires of the poĆ tentiometer to get the value of the pot. Leave one lead connected to the outer wire of the potenĆ tiometer. Move the other lead to the middle wire of the potentiometer. To check the variable resistĆ ance, turn the stem clockwise or counter clockĆ wise. The reading should change from 0W to the full value of the potentiometer.
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CHAPTER 6 PARTS REPLACEMENT
CTB and CTBR DOOR WINDOW ASSEMBLY 1. Open door and locate hinge pin bolts. 1. Remove the door as described. Place the door on a flat surface with the front facing up. 2. Loosen top bolt of top hinge pin and remove the bottom bolt of top hinge pin. 2. Remove the outer door skin. Turn the door onto its back. 3. Using the loosened bolt, push the hinge pin down into the door. 3. Use the window insertion tool to pry up the corĆ ners of the window assembly in the following order: 4.
PARTS REPLACEMENT ELEMENT MOTOR 1. Disconnect power from main power supply. 1. Shut off main power supply. 2. Remove right hand side panel (left hand on a CTBR ) 2. Remove Rack and rack supports. 3. Remove baffle by placing hand under back end and rotating up and out. 3. Remove the element terminal cover found above motor and disconnect wires. 4. Remove blower wheel, pay particular attention to the style of blower wheel you have some of the wheels have built on wheel pullers. 4.
