Blodgett MT3255 Series Installations- und Betriebsanleitung

MT3255 AND MT3270 SERIES

CONVEYOR OVEN

SERVICE AND REPAIR MANUAL

BLODGETT OVEN COMPANY

www.blodgettcorp.com

50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183

PN M8561 Rev B (6/01)

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...............................................................

Ventilation Requirements 1---1.......................................................

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

Gas Specifications 1 --- 3............................................................

Illustrated Parts Lists 1 --- 4..............................................................

2. ASSEMBLY

Oven Assembly Procedures 2---1........................................................

Return Air Diverters 2 --- 1...........................................................

Air Nozzles 2 --- 1...................................................................

Conveyor Belt Supports 2---1........................................................

Wire Conveyor Belt 2 --- 1............................................................

Drive Chain 2 --- 3..................................................................

End Plugs 2 --- 3....................................................................

Crumb Pans 2 --- 3..................................................................

Window Handle 2 --- 3...............................................................

3. OPERATION

Standard Control Options 3---1..........................................................

U.E. Temperature Controller with Open Loop DC Drive System 3---1.....................

U.E. Temperature Controller with Closed Loop DC Drive System 3---2....................

Athena Temperature Controller with Open Loop DC Drive System 3---3...................

Athena Temperature Controller with Closed Loop DC Drive System 3---4.................

Computer Controller 3 --- 5..............................................................

Sequence of Operation 3 --- 7............................................................

MT-70-PH Domestic --- M2468 Rev E 3---7.............................................

MT-70-PH General Export --- M2501 Rev D 3---9.......................................

MT3270 with Standard Controls --- 21575 Rev E 3---11..................................

MT3270 Twin Belt with Remote Controls --- M4410 Rev A 3---13...........................

MT3270 with Closed Loop --- M4206 Rev B 3---15.......................................

MT3255E --- M4289 Rev B 3---17......................................................

MT3270 CE --- M8296 Rev A 3---19....................................................

Oven Adjustments for Cooking 3---28.....................................................

Te m p e r a t u r e 3 --- 2 8..................................................................

Conveyor Speed Time vs. Temperature 3---28..........................................

Air Flow Adjustments 3---28..........................................................

4. CALIBRATION AND ADJUSTMENT

Convection Blower Motors 4---1.........................................................

Regulated Gas Pressure 4---2...........................................................

Standard Controller Configuration 4---3..................................................

TABLE OF CONTENTS

B e l t S p e e d C a li b r a t i o n --- C l o s e d L o o p 4 --- 3...........................................

B e l t S p e e d C a l i b r a t i o n --- O p e n L o op 4 --- 5............................................

Temperature Calibration --- United Electric Controller 4---6..............................

Temperature Calibration --- Athena Controller 4---7.....................................

Computer Controller Configuration 4---9..................................................

Computer Controls 4 --- 9............................................................

Temperature Calibration 4---11.......................................................

Belt Speed Calibration 4---12.........................................................

Motor Control Board Adjustment 4---13...................................................

Rerating the Appliance 4 --- 1 5............................................................

Checking the Firing Rate 4---16.......................................................

5. TROUBLESHOOTING

DC Drive System 5 --- 1.................................................................

Convection System 5 --- 3...............................................................

Heating System 5 --- 4..................................................................

Computer Control System 5---6.........................................................

6. TECHNICAL APPENDIX

Intermittent Ignition System 6---1........................................................

Principles of Operation 6---1.........................................................

Service Procedures 6 --- 2...........................................................

C o o k i n g C o m p u t e r --- Te m p e r a t u r e v s R e s i s t a n c e 6 --- 4....................................

Thermoelectric Voltage in Absoluter Millivolts --- Type J Thermocouple 6---5..................

Conversion Factors 6 --- 6...............................................................

Pressure Conversion 6 --- 7..............................................................

INTRODUCTION

CHAPTER 1

MT3255 and MT3270

1 --- 1

OVEN SPECIFICATIONS

VENTILATION REQUIREMENTS

The hood should completely cover the unit with an

overhang of at least 6” (15 cm) on all sides not adja-

cent to a wall. The distance from the floor to the

lower edge of the hood should not exceed 7’ (2.1

m). The ventilation system should replace 80% of

the exhaust volume with fresh make up air.

TABLE 1 should be used as a guideline.

Single Double Triple

CFM 1200-1650 2400-3300 3600-5000

/min 34 - 47 68-93 102-142

TABLE 1

ELECTRICAL SPECIFICATIONS

NOTE: Three Phase hookup is not permitted on

gas models.

WARNING: DO NOT INSTALL A “HIGH LEG” TO

ANY CONVEYOR OVEN!

Installations within the U.S.

The MT3255 and MT3270 require a 15 Amp, 60HZ,

1Φ, 208-240VAC, 4 wire service consisting of L1,

L2, neutral and ground. See FIGURE 1. Use 90_C

wire and size to National Electric or local codes.

Installations outside the U.S.

The MT3255G and MT3270 require a 15 Amp,

50Hz, 1Φ, 230 VAC, 3 wire service consisting of L1,

neutral and ground. See FIGURE 1. Use 90_Cwire

and size wire according to local codes.

The MT3255E is available in two voltage options.

The 380/220 VAC oven requires a 52 Amp, 50Hz,

3Φ,4 wire service consisting of L1, L2 neutral and

ground. The 415/240 oven requires a 48 Amp,

50Hz, 3Φ,3 wire service consisting of L1, neutral

and ground. See FIGURE 1. Use 90_Cwireand

size wire according to local codes.

U.S. Installations Export Installations --- Gas Models

120

120 208-240 OvenSupply

N220-230 OvenSupply

Export Installations --- MT3255E

110

110 380/220 OvenSupply

Export Installations --- MT3255E

N415/240 OvenSupply

FIGURE 1

INTRODUCTION

1 --- 2

CE approved installations

Connect the oven to a separate group 230V, 50 hz

with rigid connection and circuit breaker. The cir-

cuit breaker should disconnect all poles, including

neutral with a contact separation of at least 3 mm.

See FIGURE 2. Use 90_C wire and size according

to local codes.

NOTE: The burner control unit is phase sensitive.

If the phase and neutral are switched the

control locks out.

Connect exhaust fan connector 1 and 2. See

FIGURE 2. Connect phase + neutral + ground.

Connector 1

Fan

Blodgett

Connector

2-4-92

Relay A

Air Pressure Regulator

Burner Control Solenoid

MT1828G CE Approved Installations

N230 OvenSupply

FIGURE 2

MT3255 and MT3270

1 --- 3

GAS SPECIFICATIONS

GAS CONNECTIONS

Domestic and General Export installations

The gas line should be large enough to accommo-

date the peak demand of all the gas appliances.

TABLE 2 reflects a straight line, 50 foot run with no

coupling restrictions and no other appliances

drawing service. Gas line installations MUST con-

form to National Fuel Gas Code NFPA 54/ANSI

Z223.1 Sec. 1.4 (Latest Edition). TABLE 2 should

be used as a guideline only.

NOTE: For any pipe runs over 50 feet (15 m), con-

sult the factory.

CE approved installations

1. Connect the oven to the gas line with the prop-

er type of gas according to Local and National

Installation Standards. See TABLE 2.

GAS REQUIREMENTS

The firing rate for the MT3255 and MT3270 is

150,000 BTU/Hr. (43.9 kW/Hr.)

NOTE: For natural gas meter sizing, consult your

local gas company to ensure that your me-

ter will provide the proper supply.

Installations within the U.S.

1. Add the total BTU’s/hr of all the gas

appliances.

2. Convert BTU’s to cubic ft/hr using the formula

Cu Ft/Hr = 1000 BTU/Hr for natural gas.

3. Size the meter accordingly.

Installations outside the U.S.

1. Add the total M

/min of all the appliances.

2. Size the meter accordingly.

DOMESTIC AND GENERAL EXPORT

Natural Gas Propane Gas

Gas Line Sizing

Single

Double

Triple

3/4” line

1-1/4” line

3/4” line

1Iline

1-1/4” line

Orifice Size #1 #29

Incoming Gas Pressure W.C. kPa mbar W.C. kPa mbar

Static

Operational

7”

5.5”

1.74

1.36

17.4

13.7

12.5”

11”

3.11

2.73

31.1

27.4

CE APPROVED UNITS

Type of

Gas

Inlet

Pressure

mbars

Burner Pressure

mbars

Injector

Diameter

Air

Opening

Pilot

Injector

Standard

Delivery

Value kW (H

)

G25 25 12 5,80 16 2 x 0,63 46 Nat. Gas

G20 20 8 5,80 16 2 x 0,63 46 Nat. Gas

G20/G25 20/25 Totally Inscrewed

Pressure Regulator

5,15 16 2 x 0,63 46 Nat. Gas

G31 30/37/50 24 3,48 16 2 x 0,30 46 Propane

TABLE 2

INTRODUCTION

1 --- 4

ILLUSTRATED PARTS LISTS

CONVEYOR COMPONENTS

NOTE: n= ASAP Distributor Required Stocking Parts

*=ItemtoolargeforUPS

Ref.

No.

Part

No. Description

Ref.

No.

Part

No. Description

21926 Belt, Wire S/S 32” SB (Per

Foot) (Total Length MT3270 18

FT, MT3255 16 FT)

23112 Belt, Wire S/S 15.75” TB (Per

Foot) (Total Length MT3270 18

FT, MT3255 16 FT)

nM2379 Speed Control Board, Bodine

(After 9/90)

nM3142 Speed Control Board, Minarik

(Before 9/90)

n21170 Speed Control Kit, Dart to Mi-

narik

M0705 Speed Control Board, KBIC w/

Pot.

nM2254 Fuse, Line, Bodine Board, 5

AMP, 125V

nM2316 Fuse, Armature, Bodine Board,

200 MA, 250V

nM3145 Potentiometer, Bodine, 10 K

nM3143 Potentiometer, Minarik, 5 K

nM3144 Potentiometer, Dart, 10 K

21169 Knob, Speed Control Poten-

tiometer

nM0200 Lock, Speed Control Poten-

tiometer

nM0201 Dial, Speed Control Potentiom-

eter

nM3146 Time Display, Digital

nM3147 Pick---Up, PV---10 (for M3146)

M3393 Speed Control, Dart Micro---

Drive

nM0984 Pick---Up, PV---2 (for M3393)

M5770 Conversion Kit, Digital Time

(Open Loop) to Micro-Drive

(Closed Loop)

nM3127 Motor, Conv. Drive, Bodine 90V

(Before 9/90)

nM2378 Motor, Conv. Drive, Bodine

130V (After 9/90)

nM2500 Brush Set, Bodine

n21152 Chain, Drive Single Belt (2.33

FT)

M0391 Chain, Drive Twin Belt (Specify

5.50 FT & Order M0112)

nM0112 Masterlink, Drive Chain

M2156 Cover, Drive Chain

* M1730 Conveyor Assy., Drive SB

MT3270 (Before 5/3/95)

* M6144 Conveyor Assy., Drive SB

MT3270 (After 5/3/95)

* M1731 Conveyor Assy., Idle SB

MT3270 (Before 5/3/95)

* M6145 Conveyor Assy., Idle SB

MT3270 (After 5/3/95)

* M1686 Conveyor Assy., Drive TB

MT3270 (Before 5/3/95)

* M6147 Conveyor Assy., Drive TB

MT3270 (After 5/3/95)

* M1688 Conveyor Assy., Idle TB

MT3270 (Before 5/3/95)

* M6148 Conveyor Assy., Idle TB

MT3270 (After 5/3/95)

* M1941 Conveyor Assy., Drive MT3255

* M1946 Conveyor Assy., Idle MT3255

nM0109 Sprocket, Motor Drive, 12 Tooth

(1 Per Motor)

nM0110 Sprocket, Conveyor Drive, 15

Tooth (Qty 1)

M1865 Sprocket, Conveyor Drive, 15

Tooth (TB Qty 1)

nM0108 Sprocket, Conveyor Belt, 11

Tooth (Qty 14 SB) (Qty 16 TB)

21301 Sprocket, High Speed (Large)

nM0122 Bearing, Conveyor Drive

MT3255 and MT3270

1 --- 5

TEMPERATURE CONTROLS

NOTE: n= ASAP Distributor Required Stocking Parts

COMPUTER CONTROLS

Ref.

No.

Part

No. Description

Ref.

No.

Part

No. Description

nM6474 Computer Control Kit, Closed

Loop SB

nFW525 Computer Control Kit, Closed

Loop SB (Reconditioned)

M5635 Computer Control Kit, Open

Loop TB

M3175 Decal, Lexan Control SB

M4400 Decal, Lexan Control TB

nM7427 Probe, Temperature RTD, 500

OHMS

M7202 Conversion Kit, Open Loop to

Closed Loop

nM3347 Cable, Computer Control, 25

Pin, 10’

nM3348 Cable, Computer Control, 9

Pin, 10’

M3490 Cable, Computer Control, 25

Pin, 50’

M3491 Cable, Computer Control, 9

Pin, 50’

nM3349 Harness, Inter---Connecting DC

Drive, 3-Wire (For 9 Pin)

M3353 Harness, Relay Board (Open

Loop)(For25Pin)(Before

9/15/95)

M7237 Harness, Relay Board (Closed

Loop)(For25Pin)(After

9/15/95)

M3314 Bracket, Computer Wall

M5661 Bracket Assy., Cable Clamp

nM0984 Pick---Up, PV---2

M7236 Board, Relay/Transformer

n22672 Relay

nM3352 Transformer, 120V to 24V

nM3295 Thermostat, High Limit (Manual

Reset)

nM0152 Contact, Emergency Stop

Switch

M3296 Activator, Emergency Stop

Switch (Mushroom Shape)

M3297 Nameplate, Emergency Stop

nM3136 Breaker, 7 AMP Circuit

nM2772 Breaker, 4 AMP Circuit

SOLID STATE CONTROLS

Ref.

No.

Part

No. Description

M7982 Controller, Analog Temperature

(Before Mid 1986)

nM3149 Controller, Digital Temperature

(After Mid 1986)

nM3439 Relay, Digital Temp. Controller,

10 AMP, 250V

nM3150 Control Board, Temperature Hi---

Lo Limit

nM3151 Thermocouple, Dual Lead (Be-

fore 9/90)

nM3152 Thermocouple, Single Lead (Af-

ter 9/90)

INTRODUCTION

1 --- 6

ELECTRICAL COMPONENTS

NOTE: n= ASAP Distributor Required Stocking Parts

Ref.

No.

Part

No. Description

Ref.

No.

Part

No. Description

nM2316 Fuse, Armature, Bodine Board,

200 MA, 250V

nM2254 Fuse, Line, Bodine Board, 5

AMP, 125V

nM0156 Fuse, Convection Motor

FNM---10 (Qty 8)

M0702 Fuse Block

nM1821 Fuse, Control SC---4 (Qty 3)

(Before...)

nM0158 Fuse Holder (Qty 3) (Before...)

nM3389 Fuse, Ceramic MDA---4 (Qty 3)

(After...)

nM3390 Fuse Holder (Qty 3) (After...)

nM1362 Snap Disc, L140/20F, 2 Pole

SPST

nM0635 Snap Disc, F110/20F, 2 Pole

SPST

nM2453 Snap Disc, L140/20F, 3 Pole

SPDT (PH)

M0593 Terminal Block, 2 Pole

nM0708 Contactor, 3 Pole, 120V Coil

(Convection)

nM0595 Switch, Air Pressure SPDT

21124 Fan Kit, Axial (Old)

n21134 Fan, Axial 30 CFM 3---1/2”

nM2469 Fan, Axial 110 CFM 4---1/2”

M0571 Guard & Hardware, Fan 4” (Qty

nM0572 Cord, Axial Fan 30” Power

nM0152 Selector Switch, Heat & Convey-

nM0153 Selector Switch, Blower

nM0151 Knob, Selector Switch (Heat,

Conveyor or Blower)

M1694 Cord Set & Plug Assy., 10 Foot

M0772 Receptacle, Twist Lock

n16998 Relay, Interlock Hood System

SPST, 120V (PH)

16241 Relay, Alarm 3PDT, 120V (PH)

nM0791 Indicator Light (PH)

CONVECTION COMPONENTS

Ref.

No.

Part

No. Description

nM4224 Motor & Blower Assy., CW

nM4225 Motor & Blower Assy., CCW

nM5722 Insulation Kit for Blowers

MT3270

M7992 Insulation Kit for Blowers

MT3255

M5131 Nozzle Assy. w/ Diverter

MT3270/MT3255

21161 Diverter, Return Air RH

MT3270/MT3255

21162 Diverter, Return Air LH

MT3270/MT3255

AIR PLATES

Ref.

No.

Part

No. Description

M3905 Plate Assy., Air RH (R---L or L---R)

MT3270 Generic

M3906 Plate Assy., Air LH (R---L or L---R)

MT3270 Generic

21399 Plate Assy., Air RH (R---L or L---R)

MT3255 Generic

21400 Plate Assy., Air LH (R---L or L---R)

MT3255 Generic

24613 Hook, Air Pan

22117 Plate Assy., Block Off

MT3270/MT3255 Generic

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