Blodgett MT1820E Repair Manual

MT3870CONVEYOR OVENSERVICE AND REPAIR MANUALBLODGETT OVEN COMPANYwww.blodgettcorp.com50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Teleph

MT38701-3ILLUSTRATED PARTS LISTSELECTRICAL COMPONENTSNOTE:  = ASAP Distributor Required Stocking PartsRef.No.PartNo. DescriptionRef.No.PartNo. Descr

INTRODUCTION1-4CONVEYOR COMPONENTSNOTE:  = ASAP Distributor Required Stocking Parts* = Item is Too Large for UPSRef.No.PartNo.DescriptionRef.No.Part

MT38701-5CONVECTION COMPONENTSNOTE:  = ASAP Distributor Required Stocking PartsRef.No.PartNo.DescriptionRef.No.PartNo.Description33 M4224 Motor &am

INTRODUCTION1-6GAS BURNER COMPONENTSNOTE:  = ASAP Distributor Required Stocking PartsRef.No.PartNo.DescriptionRef.No.PartNo.Description40 22132 Burn

MT38701-7EXTERIOR COMPONENTSNOTE:  = Doors are not returnableRef.No.PartNo.DescriptionRef.No.PartNo.Description M2868 Door Assembly, Pull Down S/S(u

INTRODUCTION1-8Ref.No.PartNo. DescriptionRef.No.PartNo. DescriptionM5485 Panel & Filter Assy. MT3855G(Qty 1) (After 11/14/95)XXXXX Control Box Cov

MT38701-9EXCLUSIVE TO EXPORTNOTE:  = ASAP Distributor Required Stocking PartsRef.No.PartNo.DescriptionRef.No.PartNo.Description88 M2276 Burner Assy.

INTRODUCTION1-10MT3870 DOMESTIC & GENERAL EXPORT CONTROL BOX(Control Plate and/or Gas Burner Components not Shown)

MT38701-11MT3870 CE CONTROL BOX(Control Plate and/or Gas Burner Components not Shown)

INTRODUCTION1-12MT3870 DOMESTIC GAS BURNER COMPONENTS(Control Box not Shown)

TABLE OF CONTENTSi1. INTRODUCTIONOven Specifications 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MT38701-13MT3870 CE GAS BURNER COMPONENTS(Control Box not Shown)

INTRODUCTION1-14MT3870 DOMESTIC & GENERAL EXPORT SB CONTROL PLATE ASSY(M6590)

MT38701-15MT3870 CE SB CONTROL PLATE ASSY(M6589)

INTRODUCTION1-16MT3870 EXTERIOR OVEN VIEW

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ASSEMBLYCHAPTER 2

MT38702-1OVEN ASSEMBLY PROCEDURESRETURN AIR DIVERTERS1. Slide the return air diverters into the oven andclip to the lower rear of the baking cavity. T

ASSEMBLY2-2the front of the oven. If a direction change is reĆquired, the polarity of the drive motor must be reĆversed. To change the polarity of t

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OPERATIONCHAPTER 3

TABLE OF CONTENTSiiBelt Speed Calibration 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MT38703-1COMPUTER CONTROLLER123456789FIGURE 1CONTROL DESCRIPTION1. DIGITAL DISPLAY - Displays the time, temĆperature and controller related info

OPERATION3-2PROGRAMMING PROCEDURESProgramming the Cook Time:1. Press the PROGRAM/ENTER key (8).2. Press the TIME key (7). The display readsPROG

MT38703-3SEQUENCE OF OPERATIONDOMESTIC AND GENERAL EXPORT OVENSCOMPONENT REFERENCENOTE: Refer to FIGURE 3 for component locaĆtions.1. COOKING CO

OPERATION3-4112345191813151467891110121617 17 17 17FIGURE 2

MT38703-5CE OVENSCOMPONENT REFERENCENOTE: Refer to FIGURE 3 for component locaĆtions.1. BLOWER RELAY2. MOTOR CONTACTOR3. CONVECTION FANS4. CONVE

OPERATION3-61114131297854161517106213333FIGURE 3

MT38703-7OVEN ADJUSTMENTS FOR COOKINGTEMPERATUREThe internal temperature of your product is very imĆportant; and should be taken as soon as the prodĆu

CALIBRATION ANDADJUSTMENTCHAPTER 4

MT38704-1CONVECTION BLOWER MOTORSTO CHECK MOTOR ROTATION1. Remove the back of the oven body and verifyproper motor rotation. (See FIGURE 1)For motor

CALIBRATION AND ADJUSTMENT4-2REGULATED GAS PRESSURE1. Let the oven run up to 510F (266C). You maynow verify the operational and regulated gaspressur

Literature Addendum??????Rev - 10/9/96Page 1 of 3Operation - Cooking Computer without Conveyor ControlNOTE: This addendum applies to tandem ovens only

MT38704-3COMPUTER CONTROL CONFIGURATIONINITIATING ACCESS MODEThe Cooking Computer provides a special AccessMode for setting and displaying certain com

CALIBRATION AND ADJUSTMENT4-4DISPLAY ACTION TAKENDISPLAYACTIONTAKENOPTĆ1 PressPROGENTERDONESAVEEXITPressPROGENTEROPTĆ2 may be selected for MT3870 oven

MT38704-5TEMPERATURE CALIBRATIONTO ENTER THE CALIBRATION MODE1. Press the ON/OFF key until OFF is displayed.2. Press CLEAR 1 2 3 4 5 6 ENTER to enter

CALIBRATION AND ADJUSTMENT4-6BELT SPEED CALIBRATIONCLOSED LOOP SYSTEMTo enter the calibration mode:1. Press the ON/OFF key until OFF is displayed.2. P

MT38704-7OPEN LOOP SYSTEM - SINGLE BELTTo enter the calibration mode:1. Press the ON/OFF key until OFF is displayed.2. Press CLEAR 1 2 3 4 5 6 ENTER t

CALIBRATION AND ADJUSTMENT4-8OPEN LOOP SYSTEM - TWIN BELTTo enter the calibration mode:1. Press the ON/OFF key until OFF is displayed.2. Press CLEAR

MT38704-9MOTOR CONTROL BOARD ADJUSTMENTHigh/low speed motor control board adjustĆment for 180 and 130 volt DC motorsNOTE: The motor control board

CALIBRATION AND ADJUSTMENT4-10Warning: Circuit components are not at ground potential! Use only a nonĆmetallic orinsulated adjustment tool. Shock haza

MT38704-11RERATING THE APPLIANCEDue to the lack of oxygen at higher elevations, theunit may need to be rerated. (The orifice size mayneed to be adjust

CALIBRATION AND ADJUSTMENT4-12CHECKING THE FIRING RATEMethod #11. Turn off all other appliances on the line. Pressthe ON/OFF key on the unit to call f

Literature Addendum2M7260.1Rev - 9/5/96Operation - Cooking Computer without Conveyor ControlOPERATIONTo turn the oven on:1. Turn the manual gas valve

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TROUBLESHOOTINGCHAPTER 5

MT38705-1DC DRIVE SYSTEMPOSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #1 - Conveyor Belt will not run Oven in OFF mode. Loose computer controller cord c

TROUBLESHOOTING5-2COMPUTER CONTROL SYSTEMPOSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #1 - Computer controller displays: PROBE Ć OPEN Ć PROBE Ć SHORT and

MT38705-3HEATING SYSTEMPOSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #1 - Burner will not fire Oven in OFF mode. Emergency stop switch on OFF. Control

TROUBLESHOOTING5-4POSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #2 - Oven will not reach desired temperature Gas pressure to oven is too low. Top air pl

MT38705-5CONVECTION SYSTEMPOSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #1 - Blower motor(s) not running Oven in OFF mode. Emergency stop switch on OFF.

TROUBLESHOOTING5-6POSSIBLE CAUSE(S) SUGGESTED REMEDYSymptom #3 - Hood system does not operate when oven is on Fan exhaust/supply problem. Defective

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TECHNICAL APPENDIXCHAPTER 6

Literature Addendum??????Rev - 10/9/96Page 3 of 3Operation - Cooking Computer without Conveyor ControlPROGRAMMING PROCEDURESProgramming the Cook Time:

MT38706-1INTERMITTENT IGNITION SYSTEMPRINCIPLES OF OPERATIONPilot flame sensing is a very important aspect of theignition controls operation. Three zo

TECHNICAL APPENDIX6-2SERVICE PROCEDURESService the IID system as follows:1. Make certain the thermostat contacts areopen.2. Check for proper s

MT38706-3REPAIRING THE ELECTRONIC IGNITIONSYSTEMFlame Sensing Current Maintenance:The flame sensor is made of carbon steel and subĆject to contaminat

TECHNICAL APPENDIX6-4SERVICING THE INVENT HOODILLUSTRATED PARTS LISTQTY PART DESCRIPTION (SEE FIGURE 3) ITEM1 AMU/Exhaust Manifold/Duct Connection 11

MT38706-51234567891011121314151617182019FIGURE 3CLEANING AND MAINTENANCECAUTION!The oven and the ventilation system gethot during operation. Allow

TECHNICAL APPENDIX6-6(plastic or metal) on the exterior surfaces asthey will scratch and mar the exterior finish.Wipe out the exhaust channel por

MT38706-7PRESSURE CONVERSIONPRESSURE CONVERSION CHARTin/H2O P.S.I in/Hg mm/H2O mm/Hg kg/cm2bar mbar Pa kPa1 .0361 .0735 25.41 1.868 .0025 .0025 2.489

TECHNICAL APPENDIX6-8in/H2O kPaPambarbarkg/cm2mm/Hgmm/H2Oin/HgP.S.I28 1.010 2.056 710.8 52.26 .0710 .0696 69.64 6964 6.96429 1.047 2.132 736.8 54.18 .

MT38706-9CONVERSION FACTORSCOMMON CONVERSION FACTORSMultiply By To GetBTU/hr .001054804 MJ/hr.0002931 kW.29285 WBTU/Ft3.0372589 MJ/m38.905102 kcal/m3M

TECHNICAL APPENDIX6-10COOKING COMPUTER - TEMPERATURE VS RESISTANCET/F Res/Ohms T/F Res/Ohms T/F Res/Ohms T/F Res/Ohms70 541.12 230 711.43 390 877.15 5

INTRODUCTIONCHAPTER 1

MT38701-1OVEN SPECIFICATIONSVENTILATION REQUIREMENTSThe hood should completely cover the unit with anoverhang of at least 6" (15 cm) on all sides

INTRODUCTION1-2GAS SPECIFICATIONSGAS CONNECTIONSDomestic and General Export installationsThe gas line should be large enough to accommoĆdate the peak