Blodgett MT2136 Service And Repair Manual

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MT2136 SERIES

CONVEYOR OVEN

SERVICE AND REPAIR MANUAL

50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone (802) 658Ć6600 Fax: (802)864Ć0183

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

BLODGETT OVEN COMPANY

www.blodgettcorp.com

PN M9884 A (6/01)

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

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

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

Drive Chain 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Air Plates 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conveyor Tunnel Extensions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conveyor Belt Tensioners 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Mount remote control 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. OPERATION

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

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

Athena Temperature Controller with Open Loop DC Drive System 3-2. . . . . . . . . . . . . . . . . . .

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

Sequence of Operation 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MT2136E Domestic with Athena controls - M2190 Rev H 3-5. . . . . . . . . . . . . . . . . . . . . . . . . .

MT2136E General Export with Athena controls - M2341 Rev F 3-7. . . . . . . . . . . . . . . . . . . . .

MT2136G Australian Unit with Athena Control - M2847 Rev C 3-9. . . . . . . . . . . . . . . . . . . . . .

MT2136G CE with Athena Control - M3163 Rev C 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MT2136G Domestic with Remote Computer control - M3476 Rev b 3-13. . . . . . . . . . . . . . . . .

MT2136G Domestic with Open Loop Computer Control - M3717 Rev B 3-15. . . . . . . . . . . . .

MT2136G Domestic with Closed Loop Computer Control - M7287 Rev A 3-17. . . . . . . . . . . .

MT2136E CE with Closed Loop Computer Control - M6476 Rev B 3-19. . . . . . . . . . . . . . . . . .

MT2136G CE with Computer Control - M7290 Rev E 3-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MT2136G General Export - M7295 Rev B 3-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oven Adjustments for Cooking 3-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Temperature 3-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conveyor Speed Time vs. Temperature 3-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air Flow Adjustments 3-35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS

4. CALIBRATION AND ADJUSTMENT

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

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

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

Belt Speed Calibration - Open Loop 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Temperature Calibration - Athena Controller 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Computer Controller Configuration 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Computer Controls 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Temperature Calibration 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Belt Speed Calibration 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Rerating the Appliance 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Cooking Computer - Temperature vs Resistance 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

CHAPTER 1

INTRODUCTION

MT2136

OVEN SPECIFICATIONS

VENTILATION REQUIREMENTS

The hood should completely cover the unit with an overhang of at least 6" (15 cm) on all sides not adjaĆ 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 500Ć600 1000Ć1200 1500Ć1800

M3/min 14 Ć 17 28Ć34 42Ć51

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.

MT2136G ovens require a 15 amp, 60HZ, 1F, 120/208Ć240 VAC, 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.

MT2136E ovens are available in either 1F or 3F opĆ tions. Single phase models require a 15 amp, 60 HZ, 208Ć240 VAC 3 wire service consisting of L1, L2 and ground. Three phase units require a 15 amp, 60 HZ, 208Ć240 VAC 4 wire service consisting of L1, L2, L3, and ground. See FIGURE 1. Use 90C wire and size to National Electric or local codes.

120

208Ć240

OvenSupply

MT2136G - U.S. Installations

208Ć240

OvenSupply

208Ć240

OvenSupply

MT2136E - Single Phase U.S. Installations MT2136E - Three Phase U.S. Installations

FIGURE 1

1-1

INTRODUCTION

Installations outside the U.S.

MT2136G ovens require a 15 amp, 50HZ, 1F, 220Ć240VAC, 3 wire service consisting of L1, neuĆ tral and ground. See FIGURE 2. Use 90C wire and size to National Electric or local codes.

MT2136E ovens are available in either 1F or 3F opĆ tions. Single phase units require a 15 amp, 50 HZ, 240VAC 3 wire service consisting of L1, L2 and ground. Three phase units require a 15 amp, 50 HZ, 220Ć240 VAC 4 wire service consisting of L1, L2, L3 and ground. See FIGURE 1. Use 90C wire and size to National Electric or local codes.

220Ć240

OvenSupply

MT2136G - Export Installations

240

OvenSupply

CE approved installations

The MT2136G requires a 15 amp 50Hz, 1F, 230 VAC, 3 wire service consisting of L1, neutral and ground. Connect exhaust fan connector 1 and 2. See FIGURE 2. Use 90C wire and size according to local codes.

NOTE: If the phase and neutral are switched the

control locks out.

The MT2136E requires a 15 amp, 50Hz, 3F, 230 VAC, 5 wire service consisting of L1, L2, L3, neutral and ground. See FIGURE 2. Use 90C wire and size according to local codes.

240

OvenSupply

MT2136E - Single Phase Export Installations

400

230

OvenSupply

MT2136E - Three Phase Export Installations

L3 L2 L1

Blodgett

Connector

230

1 2

OvenSupply

MT2136G CE Approved Installations

FIGURE 2

MT2136E - CE Approved Installations

Fan

21Air Pressure Regulator

Burner Control Solenoid

1-2

2Ć4Ć92

Relay A

MT2136

GAS SPECIFICATIONS

GAS CONNECTIONS

Domestic and General Export installations

The gas line should be large enough to accommoĆ 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 conĆ 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), conĆ

sult the factory.

CE approved installations

1. Connect the oven to the gas line with the propĆ er type of gas according to Local and National Installation Standards. See TABLE 2.

DOMESTIC AND GENERAL EXPORT

Natural Gas Propane Gas

Gas Line Sizing

GAS REQUIREMENTS

The firing rate for the MT2136G is 55,000 BTU/Hr. (16 kW/Hr.)

NOTE: For natural gas meter sizing, consult your

local gas company to ensure that your meĆ 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 M3/min of all the appliances.

2. Size the meter accordingly.

Single

Double

Triple

Orifice Size #1 #29

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

Static

Operational

CE APPROVED UNITS

Type of

Gas

G25 25 12 3,30 2 x 16 2 x 0,63 16,3 Nat. Gas

G20 20 8 3,30 2 x 16 2 x 0,63 16,3 Nat. Gas

G20/G25 20/25 Totally Inscrewed

G31 30/37/50 24 2,10 2 x 16 2 x 0,30 16,3 Propane

Inlet

Pressure

mbars

Burner Pressure

Pressure Regulator

5.5"

mbars

3/4" line

1" line

1.74

1.36

Injector

Diameter

TABLE 2

3/4" line

17.4

13.7

Opening

2,90 2 x 16 2 x 0,63 16,3 Nat. Gas

Air

12.5"

11"

Pilot

Injector

3.11

2.73

Standard

Delivery

Value kW (HS)

31.1

27.4

1-3

ILLUSTRATED PARTS LISTS

CONVEYOR COMPONENTS

NOTE:  = ASAP Distributor Required Stocking Parts

Ref.

Part

No.

No. Description

Ref.

Part

No.

No. Description

INTRODUCTION

M2740 Belt, Wire S/S 21" SB (Per Foot)

(Total 11 FT)

39 M6336 Belt, Wire S/S 10" TB (Per Foot)

(Total 21 FT)

M2388 Tensioner Assy., Belt

22 M2379 Speed Control Board, Bodine

M3301 Capacitor, Speed Control

Board, 200WVDC

M3145 Potentiometer, Bodine, 10K

23 M2316 Fuse, Armature, Bodine Board,

200 MA, 250V

7  M2254 Fuse, Line, Bodine Board, 5

AMP, 125V

M5770 Conversion Kit, Digital Time

(Open Loop) to MicroĆDrive (Closed Loop)

M7202 Conversion Kit, Open Loop to

Closed Loop (Computerized)

M3146 Time Display, Digital

M3147 PickĆUp, PVĆ10 (For M3146)

M0200 Lock, Speed Control PotentiomĆ

eter

M0201 Dial, Speed Control PotentiomeĆ

ter

21169 Knob, Speed Control PotentiomĆ

eter

M2378 Motor, Conveyor Drive, Bodine

130V

M2500 Brush Set, Bodine

M2738 Chain, Drive

M2011 Conveyor Assy., Drive Side SB

M2012 Conveyor Assy., Idle Side SB

M2207 Conveyor Assy., Drive Side TB

M2208 Conveyor Assy., Idle Side TB

M0109 Sprocket, Motor Drive, 12 Tooth

SB/TB

M0108 Sprocket, Conveyor Belt, 11

Tooth SB/TB (Bore Diameter 3/4" ) (Qty 1)

M0110 Sprocket, Conveyor Drive, 15

Tooth SB/TB (Bore Diameter 3/4")

M1865 Sprocket, Conveyor Drive, 15

Tooth TB (Bore Diameter 1/2")

M0112 Masterlink, Drive Chain

M0122 Bearing, Conveyor Drive

1-4

MT2136

TEMPERATURE CONTROLS

Computer solid state controls for ovens manufactured after mid sept., 1993

NOTE:  = ASAP Distributor Required Stocking Parts

Part

Ref.

No. Description

No.

M3149 Controller, Digital Temperature

M3439 Relay, Digital Temp. Controller,

10 AMP, 250V

M3150 Control Board, Temperature HiĆ

Lo Limit

M3151 Thermocouple, Dual Lead

M3152 Thermocouple, Single Lead

M6474 Computer Control Kit, Closed

Loop SB

FW525 Computer Control Kit, Closed

Loop SB (Reconditioned)

M5635 Computer Control Kit, Open

Loop TB

M7427 Probe, Temperature RTD, 500

OHMS

M3347 Cable, Computer Control, 25

Pin, 10 Foot

M3348 Cable, Computer Control, 9 Pin,

10 Foot

M3490 Cable, Computer Control, 25

Pin, 50 Foot

M3491 Cable, Computer Control, 9 Pin,

50 Foot

Ref.

Part

No.

No. Description

M3314 Bracket, Computer Wall

M5661 Bracket Assy., Cable Clamp

19 22672 Relay, Control (Ice Cube) (Qty 4)

18 M3295 Thermostat, High Limit (Manual

Reset)

M0152 Contact, Emergency Stop

Switch

M3296 Activator, Emergency Stop

Switch (Mushroom Shape)

M3297 Nameplate, Emergency Stop

20 M3136 Breaker, 7 AMP Circuit (Qty 2)

(Before AB Ver.)

21 M2772 Breaker, 4 AMP Circuit (Qty 2)

(Before AB Ver.)

26 M3352 Transformer, 120V to 24V (Qty 1)

M3349 Harness, InterĆConnecting DC

Drive, 3 Wire (For 9 Pin)

M3353 Harness, Relay Board (Open

Loop) (Qty 1) (For 25 Pin)

M7237 Harness, Relay Board (Closed

Loop) (Qty 1) (For 25 Pin)

1-5

GAS BURNER COMPONENTS

NOTE:  = ASAP Distributor Required Stocking Parts

INTRODUCTION

Part

Ref.

No.

20287 Valve, Single Solenoid 110/120V

M0282 Valve, Manual Gas

3  M0767 Blower Motor, Combustion w/

4  M2383 Blower Motor, Combustion

1  M2381 Transformer, 120V to 24V

2  M2385 Relay, Time Delay

5  M6397 Pilot Burner & Igniter Assy.,

5  M6398 Pilot Burner & Igniter Assy., LP

6 M0248 Tube, Pilot Aluminum 1/4"

7 22258 Burner Assy., Complete

8  M0415 Flame Sensor

9  M0697 Orifice, Pilot Natural

9  M2690 Orifice, Pilot LP

10 M3203 Orifice, Main Burner, Natural

10 M1491 Orifice, Main Burner, LP (MTD

Description

Control Box

Natural

(MTD 29)

45)

Ref.

Part

No.

M2140 Flame Tube Assy.

16 M1054 Spark Box, 24V

11 M5495 Dual Solenoid/Pressure RegulaĆ

11 22190 Dual Solenoid/Pressure RegulaĆ

M3434 Conversion Kit, Natural to LP

M3435 Conversion Kit, LP to Natural

18612 Spring, Solenoid Valve, Natural

23007 Spring, Solenoid Valve, LP to

12 M0279 Union, 1/2 Inch Black

13 1949 Nipple, Pipe 1/2 x 1Ć3/16 Close

M0590 Nipple, Pipe 1/2 x 2Ć1/2

14 M0317 Elbow, 1/2 Inch Street 90 Deg.

15 597 Ell, Black 90 Degree

17874 Ell, Black 1/2 x 3/4

Description

tor, Nat. 24V

tor, LP 24V

(MTD 45)

(MTD 29)

to LP

Natural

1-6

MT2136

ELECTRICAL COMPONENTS

NOTE:  = ASAP Distributor Required Stocking Parts

Part

Ref.

No.

M2571 Element Assy., 208V, 3 PH, 15

M2697 Element Assy., 208V, 1 PH, 15

M2572 Element Assy., 240V, 3 PH, 15

M2698 Element Assy., 240V, 1 PH, 15

M6891 Element, Individual, 208V (Qty 6)

M6892 Element, Individual, 220V (Qty 6)

M6893 Element, Individual, 240V (Qty 6)

20162 Fuse, 10 AMP, 300V, SCĆ10 (Qty

M1821 Fuse, 4 AMP, 300V, SCĆ4 (Qty 2)

M0156 Fuse, 10 AMP, 250V, FMNĆ10

M3389 Fuse, 4 AMP, Ceramic, MDAĆ4

M0158 Fuse Holder for SCĆ10 & SCĆ4

M0702 Fuse Block for FMNĆ10 Fuse

M3390 Fuse Holder, 20 AMP for MDAĆ4

M2453 Snap Disc, L140Ć20F, 3 Pole

M1362 Snap Disc, L140Ć20F, 2 Pole

M0635 Snap Disc, F110Ć20F, 2 Pole

M2734 Snap Disc, L165Ć30F, 2 Pole

M0593 Terminal Block, 2 Pole (Neutrals)

M3714 Terminal Block, 3 Pole (Power)

25 M0708 Contactor, Mechanical, 16 AMP,

M2483 Contactor, Mercury, 60 AMP, 3

M2720 Contactor, Mercury, 100 AMP, 2

Description

KW (Qty 1)

2) (After...)

(Before...)

Fuses (Qty 2)

Fuse

SPDT

SPST

w/ Push On Terminals

MT2136E w/ Allen Head Screws

3 Pole,120V Coil (Motor)

Pole, 120V Coil (Heat)

Ref.

Part

No.

M7170 Transformer, 240V to 115V

M2469 Fan, Axial 110 CFM 4Ć1/2" (Qty

M0571 Guard & Hardware, Fan (Qty 3)

M0572 Cord Set, Axial Fan (Qty 3) or (AB

M0152 Selector Switch, Heat & ConveyĆ

M0153 Selector Switch, Blower

M0151 Knob, Selector Switch (Heat/

M1694 Cord Set & Plug Assy., 10 Foot

M0772 Receptacle, Twist Lock

4168 Lug, Grounding

CONVECTION COMPONENTS

Ref.

Part

No.

No. Description

M2871 Motor & Blower Assy., 60 HZ,

M2870 Motor & Blower Assy., 60 HZ,

36 M2100 Nozzle Assy. (Aluminum) (Qty 5)

36 M3456 Nozzle Assy. (S/S) (Qty 5)

M2741 Plate Assy., Air (Aluminum) (LH

37 M7490 Air Plate, LH (Aluminum)

38 M7493 Air Plate, RH (Aluminum)

M7492 Plate Assy., Block Off

M3125 Upgrade Kit, Cooling Fan (DoĆ

Description

3) or (AB Qty 4)

or (AB Qty 4)

Qty 4)

Conveyor/Blower)

CW (Qty 1)

CCW (Qty 1)

& RH)

mestic)

1-7

EXTERIOR COMPONENTS

NOTE:  = ASAP Distributor Required Stocking Parts

 = Doors Are Not Returnable

INTRODUCTION

Part

Ref.

No. Description

No.

M2085 Decal, Control Panel, SB, Red

M2087 Decal, Control Panel, TB, Red

M2524 Decal, Racing Strip, Red

M2722 Decal, Control Panel, SB, Black

M2723 Decal, Black

M2769 Decal, Control Panel, TB, Black

28 M4306 Crumb Pan, Idle (Remote & InĆ

tergal)

27 M4372 Crumb Pan, Drive w/ Remote

27 M4305 Crumb Pan, Drive w/ Intergal

M4309 Stop, Product

29 M3121 Extension Assy., Product 6"

29 M3122 Extension Assy., Product 12"

26 M2059 Drip Pan (Aluminum)

26 M5008 Drip Pan (S/S)

30 M2450 Access Panel, Combustion

Compartment (Manual) Element Assy., 240V, 3 PH, 15 KW (Qty 1)

30 M3376 Access Panel, Combustion

Compartment (Computer Controls)

30 M3553 Access Panel, Control Box

(Integral)

31 M4580 Access Panel, Front w/ Door

M2072 Access Panel, Front w/o Door

M2514 Bolt, Front Access Panel (Allen

Head Decoration)

M3420 Gasket Assy., Front Access PanĆ

M3574 Retainer, Gasket Top/Bottom w/

Door

Ref.

Part

No.

No. Description

M3575 Retainer, Gasket LH/RH w/ Door

M2731 Retainer, Gasket Top/Bottom

w/o Door

M2732 Retainer, Gasket LH/RH w/o

Door

M2801 Hinge Pin & Plate Assy.

16470 Nameplate, Blodgett 10"

32  M4587 Door Assy., Sandwich

M2188 Handle Assy., Sandwich Door

M6035 Latch, Sandwich Door

33 M4581 Plate, Pivot RH Slotted

34 M4582 Plate, Pivot LH Slotted

M6970 Retrofit Kit, Sandwich Door

(To Add Sandwich Door)

M2515 Allen Key

21826 Installation Hose, 36"

21242 Installation Hose, 48"

M7273 Body Top w/ Hardware

M2678 Body Back

M2361 Pin, Stacking

M2486 Stacking Rails

M2439 Stacking, 24" Stand & Caster

Assy.

M3123 Stacking, Single to Double

M3124 Stacking, Double to Triple

M2532 Triple Base w/ Casters

M3998 Heat Shield Kit

35 M2075 Tunnel Extension

1-8

MT2136

EXCLUSIVE TO VERSION AB

Serial number model identification code of BK=MT2136G or FB=MT2136E.

NOTE:  = ASAP Distributor Required Stocking Parts

Part

Ref.

No. Description

No.

1 M5070 Conveyor Assy., Drive Side SB

M5066 Conveyor Assy., Idle Side SB

M5069 Conveyor Assy., Drive Side TB

M5067 Conveyor Assy., Idle Side TB

M6044 Snap Disc, L110Ć20F, 3 Pole

M5302 Nozzle Assy. (Aluminum) (Qty 5)

M5288 Nozzle Assy. (S/S) (Qty 5)

M2741 Plate Assy., Air (Aluminum) (LH

& RH)

M7490 Air Plate, LH (Aluminum)

M7493 Air Plate, RH (Aluminum)

M4674 Air Plate, LH (S/S)

M4675 Air Plate, RH (S/S)

M4163 Plate Assy., Block Off

(Aluminum)

M4673 Plate Assy., Block Off (S/S)

M5071 Crumb Pan, Idle (Remote & inteĆ

gral) (Bottom Section)

M5335 Crumb Pan, Drive w/ Remote

(Bottom Section)

M5068 Crumb Pan, Drive w/ Integral

(Bottom Section)

M6996 Crumb Pan, Idle (Remote & InteĆ

gral) (Top & Middle Section Ć Vented)

M6995 Crumb Pan, Drive w/ Remote

(Top & Middle Section Ć Vented)

M5068 Crumb Pan, Drive w/ Intergal

(Top & Middle Section)

M7002 Extension Assy., Product 6"

M6997 Extension Assy., Product 12"

M7000 False Front w/o Door

Ref.

Part

No.

No. Description

M7001 False Front w/ Door

M6213 Access Panel, Combustion

Compartment

M6035 Latch, Combustion Compartment

Access Panel

M4580 Access Panel, Front w/ Door

M6389 Access Panel, Front w/o Door

M2733 Bolt, Front Access Panel

M2599 Gasket, Front Access Panel

M3574 Retainer, Gasket Top/Bottom w/

Door

M3575 Retainer, Gasket LH/RH w/ Door

M6383 Retainer, Gasket w/o Door

M2801 Hinge Pin & Plate Assy.

16470 Nameplate, Blodgett 10"

M4587 Door Assy., Sandwich

M2188 Handle Assy., Sandwich Door

M6035 Latch, Sandwich Door

M4581 Plate, Pivot RH Slotted

M4582 Plate, Pivot LH Slotted

M7274 Body Top w/ Hardware

M6220 Body Back

21390 Legs, 17Ć1/4" w/ Casters

(Double Oven)

21391 Legs, 23Ć1/4" w/ Casters

(Single Oven)

M3828 Pin, Stacking

M5537 Triple Base w/ Casters

NOTE: MT2136 AB version is only available with

legs (Part #'s 21390 & 21391). There is no stand available for this oven.

1-9

EXCLUSIVE TO EXPORT 50 HZ (ZA VERSION)

NOTE:  = ASAP Distributor Required Stocking Parts

INTRODUCTION

Part

Ref.

No. Description

No.

M2246 Burner Assy., Complete

M2386 Blower Motor, Combustion

M2384 Transformer (Burner Assy.)

M2245 Valve, Single Solenoid, 240VAC

M2573 Element Assy., 220/380V, 3 PH,

15 KW

M2699 Element Assy., 220/380V, 1 PH,

15 KW

M2574 Element Assy., 240/415V, 3 PH,

15 KW

M2698 Element Assy., 240/415V, 1 PH,

15 KW

M6892 Element, Individual, 220/380V

M6893 Element, Individual, 240/415V

M2630 Fuse, Bodine Speed Control, 5

AMP, 250V

23034 Axial Fan, 230V (Qty 3)

M2247 Contactor, Mechanical, 16 AMP,

3 Pole, 250V (Motor) 50 HZ

R1530 Contactor, Mercury, 60 AMP, 3

Pole (Heat)

M2591 Contactor, Mercury, 100 AMP, 1

Pole (Heat)

M7170 Transformer, 208/460Ć120V,

300VA (Step Down)

M2873 Motor & Blower Assy., 50 HZ,

M2872 Motor & Blower Assy., 50 HZ,

CCW

M3154 Time Display, Digital 50 HZ

M3126 Upgrade Kit, Cooling Fan (ExĆ

port)

M3153 Speed Control Board, Digital

180VDC

M3128 Motor, Conveyor Drive, 180VDC

M3155 Controller, Temperature C§/50

M2819 Switch, Air Pressure Differential

(in W.C) (Qty 1) (Australia)

Ref.

Part

No.

No. Description

M7880 Computer Control Kit, Closed

Loop SB (CE)

M3237 Burner Assy. (CE)

16 M7334 Pilot Burner & Igniter Assy., NatĆ

ural (CE)

16 M7333 Pilot Burner & Igniter Assy., LP

(CE)

M2497 Switch, Push Button (CE)

M2498 Switch, Contact (CE)

M0595 Switch, Air Pressure SPDT (CE)

40 M3172 Timer, Fixed, 2 Second (CE)

41 M3173 Timer, Fixed, 10 Second (CE)

M3166 Fuse, 4 Amp., 250V (CE)

M3167 Fuse Holder (CE)

M2549 Strip, Terminal (CE)

43 M3168 Spark Box, 240V (Landis & Gyr)

(CE)

R1586 Terminal Block, Power (CE)

R0166 Terminal Block, Ground (CE)

R1580 Stop, End (CE)

16037 Indicator Light, 250V, Red,

Round (CE & Australia)

90250 Relay, 240V 3PDT (CE)

42 16775 Relay, 240V SPST, 30 AMP (CE)

17 M6000 Dual Solenoid/Pressure RegulaĆ

tor, Nat. (CE)

17 M6001 Dual Solenoid/Pressure RegulaĆ

tor, LP (CE)

M3330 Switch, Air Pressure Differential

(mbr) (CE)

M6649 Noise Filter (G&E)

M6648 Noise Filter (E Only)

M7282 Relay Board (All CE ComputerĆ

ized Ovens)

M6025 Fuse, 250V 80 MA (For M7282)

1-10

MT2136

EXTERIOR COMPONENTS

3431

FIGURE 3

1-11

DOMESTIC GAS BURNER COMPONENTS

(Control Box not Shown)

INTRODUCTION

FIGURE 4

1-12

MT2136

CE GAS BURNER COMPONENTS

(Control Box not Shown)

FIGURE 5

1-13

INTRODUCTION

CONTROL PLATE ASSEMBLY

EXCLUSIVE TO CE

FIGURE 6

1-14

MT2136

This page intentionally left blank.

1-15

CHAPTER 2

ASSEMBLY

MT2136

OVEN ASSEMBLY PROCEDURES

NOZZLES

1. Install the nozzles from the center of the oven working toward the ends. Make sure the top tongue of each nozzle fits into the upper recĆ tangular cutĆout in the nozzle support plate at the top rear of the oven.

2. Pull the nozzle slightly forward to engage the hole in the alignment flange with the conveyor rail pin. To make sure that the nozzle is seated properly, try to move it from side to side. The nozzle should not move any appreciable disĆ tance.

CONVEYOR SUPPORTS

1. Slide the left conveyor belt support (with the sprocket on the end of the shaft) into the supĆ port tracks. The sprocket must be located next to the control panel after being pushed into the oven.

2. Slide the right conveyor belt support into the support tracks.

3. Install the 1/4-20 (6m x 1) hex head screw through the conveyor rack and into the control box.

WIRE CONVEYOR BELT

NOTE: The conveyor belt has loops on both sides.

The belt must be installed so the loops travĆ el as shown in FIGURE 1.

1. Thread the wire belt from the right side of the oven, lower level first.

2. After pushing the belt through on the lower levĆ el, leave about 12" (30.5 cm) hanging out on the left side.

3. Take the remainder of the belt, loop it around the right shaft, and push it through on the upĆ per level. The two ends of the belt should be approximately 6Ć9" (15Ć22 cm) past the left shaft (right shaft if right to left travel is required) on the upper level of the belt support.

Side Belt Loops

Direction of

Travel

DRIVE CHAIN

1. Install the drive chain around the drive motor, through the opening in the control panel door, and then around the sprocket on the conveyor belt support.

2. Push the conveyor motor to tighten the drive chain and lock it into position by tightening the hex socket head screws.

NOTE: Twin belt models have a double sprocket,

chain and motor.

FIGURE 1

4. Install the inner and outer master links as shown in FIGURE 2.

Master Link

Direction of

Travel

FIGURE 2

2-1

ASSEMBLY

Unless otherwise specified, the conveyor travel is factory set for leftĆtoĆright operation when facing the front of the oven. If a direction change is reĆ quired, the polarity of the drive motor must be reĆ versed. To change the polarity of the drive motor, disconnect the oven from the power source and inĆ terchange the black and white motor leads at the D.C. Controller Board located within the control box. If the polarity of the motor is changed to

rightĆtoĆleft belt travel, the conveyor belt must be installed from the left side of the oven inĆ stead of the right side.

NOTE: Reconfigure the air plates whenever the

conveyor belt direction of travel is changed.

AIR PLATES

1. Inspect the orientation of the air plates. Refer to FIGURE 3.

Right Air Plate

CONVEYOR BELT TENSIONERS

Each tensioner installs between the idle end of the conveyor (the side opposite the drive) and the oven's body side.

1. The belt tensioner contain a spring to adjust the length. Compress the spring to shorten the length of the belt tensioner.

2. Insert the pin on the end of the tensioner into the hole in the oven's body side.

3. Expand the tensioner to engage the pin loĆ cated on the conveyor support.

Conveyor

Support

Oven Body

Front

Left Air Plate

FIGURE 3

CONVEYOR TUNNEL EXTENSIONS

1. Install the conveyor tunnel extensions over the conveyor on each end of the oven.

Belt

Tensioner

Shown without conveyor belt for clarity

FIGURE 4

CRUMB PANS

1. Install the crumb pans under each end of the conveyor.

NOTE: On stacked ovens, either use perfoĆ

rated crumb pans or install the pans on the lower oven only.

MOUNT REMOTE CONTROL

1. Mount the remote control unit on a wall within reach of the computer cables.

2. Connect the computer cables from the controlĆ ler's rear connector to the connector located at the rear of the oven.

2-2

MT2136

This page intentionally left blank.

2-3

CHAPTER 3

OPERATION

MT2136

STANDARD CONTROL OPTIONS

U.E. TEMPERATURE CONTROLLER WITH OPEN LOOP DC DRIVE SYSTEM

1 53 42

COOK TIME

ON OFF

TEMPERATURE

CONVEYOR

FIGURE 1

CONTROL DESCRIPTION

1. COOK TIME DISPLAY - Gives the belt speed.

2. CONVEYOR ADJUSTMENT KNOB - Turn to adjust the conveyor speed.

3. TEMPERATURE CONTROL KNOB - Turn to set cook temperature.

4. HEAT LIGHT - Indicates the control is calling for heat.

5. HEAT SWITCH - Controls power to the burner.

6. BLOWER SWITCH - Controls power to the blowers.

7. CONVEYOR SWITCH - Controls power to the conveyor motor.

CONTROL OPERATION

1. Turn the manual gas valve to the OPEN posiĆ tion. This is only necessary on initial startĆup.

2. Turn the BLOWER SWITCH (6) to ON.

3. Push and turn the TEMPERATURE CONTROL KNOB (3) clockwise to the desired setting.

4. Turn the HEAT SWITCH (5) to ON. The burner purge timer will be energized. After approxiĆ mately thirty (30) seconds, a spark ignites the burner. Initial start may require longer due to air in the gas line.

ON OFF

HEAT

ON OFF

BLOWER

SWITCH (5) to OFF and wait 5 minutes before turning back to ON.

5. Turn the CONVEYOR SWITCH (7) to ON. The conveyor belt starts to travel through the oven. This circuit is independent and can be turned on or off without affecting any other operaĆ tions. Adjust the conveyor speed as follows:

Turn the ADJUSTMENT KNOB (2) clockwise to increase speed, counterĆclockwise to deĆ crease speed. Turn the knobĆlock behind the control knob to hold the desired belt speed

6. Turn the BLOWER (6), CONVEYOR (7) and HEAT (8) SWITCHES to OFF. The Cool Down circuit is energized. The blower motor(s) conĆ tinue to run until the oven temperature is beĆ tween 135-170F (57-77C). The digital temperature display remains lit until the cool down circuit deĆenergizes.

The oven will hold these parameters daily and will require no further adjustments unless a different product is placed in the oven.

NOTE: Each oven contains different components

and must be adjusted individually.

NOTE: If the oven fails to ignite after the thirty

(30) second purge, turn the HEAT

3-1

OPERATION

ATHENA TEMPERATURE CONTROLLER WITH OPEN LOOP DC DRIVE SYSTEM

1 2

COOK TIME

ON OFF

ACTUAL SETPOINT HEAT

TEMPERATURE

CONVEYOR

FIGURE 2

CONTROL DESCRIPTION

1. COOK TIME DISPLAY - Gives the belt speed.

2. CONVEYOR ADJUSTMENT KNOB - Turn to adjust the conveyor speed.

3. ACTUAL TEMPERATURE KEY - Press to disĆ play the actual oven temperature.

4. ACTUAL TEMPERATURE LIGHT - When lit inĆ dicates the control is displaying the actual oven temperature.

5. SETPOINT LIGHT - When lit indicates control is displaying desired cook temperature.

6. HEAT LIGHT - When lit indicates that the conĆ trol is calling for heat.

7. UP and DOWN ARROW KEYS - Used to inĆ crease/decrease desired cook temperature.

8. HEAT SWITCH - Controls power to the burner.

9. BLOWER SWITCH - Controls power to the blowers.

10. CONVEYOR SWITCH - Controls power to the conveyor motor.

CONTROL OPERATION

1. Turn the manual gas valve to the OPEN posiĆ tion. This is only necessary on initial startĆup.

2. Turn the BLOWER SWITCH (9) to ON.

3. Press the UP or DOWN ARROW keys (7) to enĆ ter the desired cook temperature.

4. Turn the HEAT SWITCH (8) to ON.

83 4 5 7

ON OFF

HEAT

ON OFF

BLOWER

NOTE: If the oven fails to ignite after the thirty

(30) second purge, turn the blower switch OFF and wait 5 minutes before turning back ON.

5. Press the ACTUAL TEMPERATURE KEY (3). If the actual temperature matches the setpoint the oven is ready to cook.

NOTE: The display will flash until the actual

temperature is within the preset deviĆ ation alarm band. The default setting is

 20F of the setpoint.

6. Turn the CONVEYOR SWITCH (10) to ON. The conveyor belt starts to move. Turn the CONĆ VEYOR ADJUSTMENT KNOB (2) clockwise to increase speed, counterĆclockwise to deĆ crease speed. Turn the knobĆlock behind the control knob to hold the desired belt speed

7. Turn the BLOWER (6), CONVEYOR (7) and HEAT (8) SWITCHES to OFF. The Cool Down circuit is energized. The blower motor(s) conĆ tinue to run until the oven temperature is beĆ tween 135-170F (57-77C). The digital temperature display remains lit until the cool down circuit deĆenergizes.

The oven will hold these parameters daily and will require no further adjustments unless a different product is placed in the oven.

NOTE: Each oven contains different components

and must be adjusted individually.

3-2

MT2136

COMPUTER CONTROLLER

45678

FIGURE 3

CONTROL DESCRIPTION

1. DIGITAL DISPLAY - Displays the time, temĆ perature and controller related information.

2. OVEN ON/OFF - Controls power to the oven.

3. NUMERIC KEYS - Used to enter numerical data in the programming mode.

4. CLEAR KEY - Used to clear the display if an error is made in the programming mode.

5. SET TEMP KEY - Used to view or program the temperature setpoint.

6. ACT TEMP KEY - Used to view the current oven temperature.

7. TIME KEY - Used to view or program the cook time.

8. PROG/ENTER KEY - Used to enter and exit the programming mode. Also used to lock in programmed settings.

9. STATUS LAMPS - When lit indicate that the fan or burners are operating.

This oven, supplied with remote control, is equipped with an emergency shut down switch. Should you need to stop the belt, fans, or heat press the emergency switch.

CONTROL OPERATION

To turn the oven on:

1. Press and hold the ON/OFF key (2). The disĆ play reads OFF when the oven is idle.

2. The display flashes WAIT  LOW  SET  TIME.

3. The FAN and HEAT status lamps (9) light. The fans begin to run. The heat rises to the proĆ grammed temperature. The conveyor belt travels at the programmed speed.

To view the cook time setting:

1. Press the TIME key (7). The LED on the key lights and the display flashes SET  TIME.

To display the actual oven temperature:

1. Press the ACT TEMP key (6). The LED on the key lights and the display reads ACTUAL  F.

To view the temperature set point:

1. Press the SET TEMP key (5). The LED on the key lights and the display flashes SET  TEMP

 F.

To turn the oven off:

1. Press the ON/OFF key (2). The blower moĆ tor(s) continue to run regardless of the controlĆ ler status until the temperature drops below 180F (82C).

Do not use the emergency switch as a GENERAL on/off switch!

3-3

OPERATION

PROGRAMMING PROCEDURES

Programming the Cook Time:

1. Press the PROGRAM/ENTER key (8).

2. Press the TIME key (7). The display reads

PROGĆ?

 SET  TIMEĆ?  _ _ _ _.

3. Use the NUMERIC keys (3) to enter the desired cook time. The display will read the numbers as they are entered. If an error is made, press the CLEAR key (4) and reĆenter the number.

4. Press the PROGRAM/ENTER key (8) a second time to lockĆin the new time. The new cook time will be stored in the computer's memory.

Programming the Temperature:

1. Press the PROGRAM/ENTER key (8).

2. Press the SET TEMP key (5). The display reads

PROGĆ?  SET  TEMPĆ?  _ _ _ _F.

3. Use the NUMERIC keys (3) to enter the desired temperature set point. The control displays the numbers as they are entered. If an error is made, press the CLEAR key (4) and reĆenter the number.

4. Press the PROGRAM/ENTER key (8) a second time to lockĆin the new temperature. The new temperature setpoint will be stored in the comĆ puter's memory.

Operation at the Programmed Settings:

DISPLAY INFORMATION

 WAIT  LOW - indicates that the present oven

temperature is lower than the set point temperĆ ature. When the oven reaches the set point temperature the display changes to READY.

 READY - indicates that the oven is ready to acĆ

cept product.

 SET  TEMP  mmss - indicates the current

cook time setting.

 HIGH  TIME - indicates that the temperature

is well above the set point. This usually occurs when moving from a higher āto a lower temperaĆ ture. Wait until the display reads ready before loading product.

 HIGH  TEMP  LIMIT - indicates that the oven

temperature exceeds the high limit from the 2nd level program. The Over Temperature Alarm buzzer will sound. Shut the oven off and wait for the unit to cool down.

 HIGH  TEMP  PANEL - indicates that the conĆ

trol area reaches an excessive temperature. Shut the oven off and wait for the unit to cool down. Error code generally means loose ground wire.

 PROBE  OPEN  PROBE  SHORT - indicates

that the temperature sensor has failed. The Alarm buzzer sounds. Shut the oven off and contact a service representative.

1. Press and hold the ON/OFF key (2).

2. The FAN and HEAT status lamps (9) light. The fans begin to run. The heat rises to the temperĆ ature setting stored in the computer's memory. The conveyor belt begins to travel at the timed speed stored in memory.

3. The display will flash WAIT  LOW  SET  TIME until the programmed bake temperature is reached. The HEAT lamp (9) will remain lit until the oven reaches the temperature set point.

4. The display reads READY and the HEAT lamp (9) goes out.

5. The oven is now ready to accept product.

6. Press and hold the ON/OFF key (2) to turn the oven off. The fans continue to run while the oven cools to a safe temperature.

3-4

MT2136

SEQUENCE OF OPERATION

NOTE: The following instructions represent the most common configurations. For questions regarding othĆ

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

MT2136E DOMESTIC WITH ATHENA CONTROLS - M2190 REV H

COMPONENT REFERENCE

NOTE: Refer to FIGURE 4 page 3-25 for compoĆ

nent locations.

1. BLOWER SWITCH (M0153)

2. HI/LO BOARD (M3150)

3. TEMPERATURE CONTROLLER (M3149)

4. MOTOR CONTACTOR (M0708)

5. CONVECTION FANS (Clockwise - M2871, CounterĆclockwise - M2870)

6. THERMOCOUPLES (Dual lead - M3151, Single - M3152)

7. HEAT SWITCH (M0152)

8. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165-30F)

9. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165-30F)

10. ELEMENT CONTACTOR (M2720)

11. HEATING ELEMENTS (208VAC, 3F - M2571 208VAC, 1F - M2697, 240VAC, 3F - M2572, 240VAC, 1F - M2698)

12. SPST THERMAL SWITCH (M0635, F110Ć20F)

13. COOLING FANS ( M2469)

14. SPST THERMAL SWITCH (M0635, F110Ć20F)

15. CONVEYOR SWITCH (M0152)

16. TIME DISPLAY (M3146)

17. 10kW POTENTIOMETER (M3145)

18. D.C. SPEED CONTROL BOARD (M2379)

19. 130 VDC MOTOR (M2378)

20. #10 HALL EFFECT PICKUP (M3147)

21. STEP DOWN TRANSFORMER (M7170)

OPERATION

1. Turn the blower switch (1) to ON. The N.O. conĆ tacts close, the N.C. contacts open. 115 VAC runs to terminal #7 of the hi/lo board (2), L1 of the temperature controller (3) and the coil of the motor contactor (4). Terminal #7 is an outĆ put. It remains powered after the oven is shut down to keep the convection fans (5) operatĆ ing until the unit reaches 135Ć170F (57Ć77C) as sensed by the thermocouples (6).

NOTE: Two thermocouples are located beĆ

tween the convection fans in the rear of the oven. One thermocouple provides DC millivolts to the Hi/Lo limit board. The other provides DC milivolts to the temperature controller. Check thermoĆ couples with a millivolt meter.

2. Turn the heat switch (7) to ON. 115 VAC is supĆ plied to terminal #5 of the hi/lo board (2). If the temperature is below 600F (316C) a switch is made between terminals #5 and #6 allowĆ ing power to go to the common terminal of the temperature controller (3). If the temperature controller (3) is calling for heat, a switch is made between common and N.O. Power is sent to one side of a N.C. SPST thermal switch (8). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the othĆ er components from hi ambient heat.

If this switch is cold it should be closed, sendĆ ing power to one side of another N.C. SPST thermal switch (9). The switch toggles if the temperature passing its face exceeds the ratĆ ing on the back of the switch.

NOTE: The switch is located between two conĆ

vection blowers in the rear convection fan compartment. It protects the other components from hi ambient heat.

If this switch is cold it should be closed, sendĆ ing power to the element contactor (10). When the element contactor closes it sends power to the heating elements (11).

3-5

OPERATION

3. When power is applied to the coils of the motor contactor (4) the contacts close sending powĆ er to the two convection fans (5) located in the back of the oven.

4. There are two cooling fans (13) located in the rear convection fan compartment. These fans are activated when the N.O. SPST thermal switch (12) closes due to high ambient heat. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from hi ambient heat.

A third cooling fan (13) is located in the control box compartment. This fan is activated when another N.O. SPST thermal switch (14) closes. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the controls from hi ambient heat.

5. The conveyor is driven by an open loop D.C. control system consisting of a conveyor switch (15), time display (16), 10kW potentiometer (17), D.C. speed control board (18), 130 VDC motor (19) and #10 Hall effect pickup (20). AfĆ ter the conveyor switch is turned on, the time display illuminates. The D.C. control board powers up. The output voltage measured on terminals A1 and A2 of the board to the motor varies from 20 to 130 VDC based on the posiĆ tion of the potentiometer. The speed of the moĆ tor should also vary. The time display varies deĆ pending on the speed of the Hall effect pickup. The pickup sends an R.P.M. value to the disĆ play. The display converts this value to minĆ utes:seconds.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

NOTE: The oven has a 240/120 step down transĆ

former (21) located in the control compartĆ ment. This transformer is used for the conĆ trols only.

3-6

MT2136

MT2136E GENERAL EXPORT WITH ATHENA CONTROLS - M2341 REV F

COMPONENT REFERENCE

NOTE: Refer to FIGURE 5 page 3-26 for compoĆ

nent locations.

1. BLOWER SWITCH (M0153)

2. HI/LO BOARD (M3150)

3. TEMPERATURE CONTROLLER (M3149)

4. MOTOR CONTACTOR (M2247)

5. CONVECTION FANS (Clockwise - M2873, CounterĆclockwise - M2872)

6. THERMOCOUPLES (Dual lead - M3151, Single - M3152)

7. HEAT SWITCH (M0152)

8. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165-30F)

9. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165-30F)

10. ELEMENT CONTACTOR (R1530)

11. HEATING ELEMENTS (220/380VAC, 3F - M2573 or 240/315 VAC 3F - M2574)

12. SPST THERMAL SWITCH (M0635, F110Ć20F)

13. COOLING FANS (23034)

14. SPST THERMAL SWITCH (M0635, F110Ć20F)

15. CONVEYOR SWITCH (M0152)

16. TIME DISPLAY (M3154)

17. 10kW POTENTIOMETER (M3145)

18. D.C. SPEED CONTROL BOARD (M3153)

19. 180 VDC MOTOR (M3128)

20. #10 HALL EFFECT PICKUP (M3147)

OPERATION

NOTE: Two thermocouples are located beĆ

NOTE: The switch is located in the slide out

control compartment. It protects the othĆ er components from hi ambient heat.

NOTE: The switch is located between two conĆ

vection blowers in the rear convection fan compartment. It protects the other components from hi ambient heat.

If this switch is cold it should be closed, sendĆ ing power to the element contactor (10). When the element contactor closes it sends power to the heating elements (11).

3. When power is applied to the coils of the motor contactor (4) the contacts close sending powĆ

3-7

OPERATION

er to the two convection fans (5) located in the back of the oven.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from hi ambient heat.

NOTE: The switch is located in the slide out

control compartment. It protects the controls from hi ambient heat.

5. The conveyor is driven by an open loop D.C. control system consisting of a conveyor switch (15), time display (16), 10kW potentiometer (17), D.C. speed control board (18), 180 VDC motor (19) and #10 Hall effect pickup (20). AfĆ ter the conveyor switch is turned on, the time display illuminates. The D.C. control board powers up. The output voltage measured on terminals A1 and A2 of the board to the motor varies from 20 to180 VDC based on the posiĆ tion of the potentiometer. The speed of the moĆ tor should also vary. The time display varies deĆ pending on the speed of the Hall effect pickup. The pickup sends an R.P.M. value to the disĆ play. The display converts this value to minĆ utes:seconds.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

3-8

MT2136

MT2136G AUSTRALIAN UNIT WITH ATHENA CONTROL - M2847 REV C

COMPONENT REFERENCE

NOTE: Refer to FIGURE 6 page 3-27 for compoĆ

nent locations.

1. BLOWER SWITCH (M0153)

2. HI/LO LIMIT BOARD (M3150)

3. TEMPERATURE CONTROLLER (M3149)

4. MOTOR CONTACTOR (M2247)

5. CONVECTION FANS (Clockwise - M2873, CounterĆclockwise - M2872)

6. THERMOCOUPLES (Dual lead - M3151, Single - M3152)

7. HEAT SWITCH (M0152)

8. CONVECTION FAN PRESSURE SWITCH (M0595)

9. STEP DOWN TRANSFORMER (M2384)

10. COMBUSTION MOTOR (M2386)

11. IGNITION MODULE (M1054)

12. PILOT VALVE (LP - 22190, Natural - M5495)

13. MAIN BURNER VALVE (LP - 22190, Natural - M5495)

14. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165Ć30F)

15. SPST THERMAL SWITCH (M1362, L140Ć20F or M2734, L165Ć30F)

16. DIFFERENTIAL PRESSURE SWITCH (M2819)

17. SINGLE SOLENOID GAS VALVE (M2245)

18. COOLING FANS (23034)

19. SPST THERMAL SWITCH (M0635, F110Ć20F)

20. SPST THERMAL SWITCH (M0635, F110Ć20F)

21. CONVEYOR SWITCH (M0152)

22. TIME DISPLAY (M3154)

23. 10kW POTENTIOMETER (M3145)

24. DC SPEED CONTROL BOARD (M3153)

25. 180 VDC MOTOR (M3128)

26. #10 HALL EFFECT PICKUP (M3147)

OPERATION

NOTE: Two thermocouples are located beĆ

2. Turn the heat switch (7) to ON. 240 VAC is supĆ plied to terminal #5 of the hi/lo board (2). If the temperature is below 316C (600F) a switch is made between terminals #5 and #6 allowĆ ing power to go to one side of a N.O. convecĆ tion fan pressure switch (8).

NOTE: This switch reacts to a vacuum created

by the convection fans (5).

When the switch closes, 240 VAC is delivered to the primary side of a 240/24 VAC step down transformer (9) and the combustion motor (10) of the flame blower. When the transformer powers up, 24 VAC are sent to the ignition module (11). After the module's self diagnosĆ tics are complete, the pilot valve (12) opens. When a proof of flame is established, the main burner valve (13) opens.

3. Terminal #5 of the hi/lo board (2) sends power to the common terminal of the temperature controller (3). If the temperature controller (3) is calling for heat, a switch is made between common and N.O. Power is sent to one side of a N.C. SPST thermal switch (14). The switch toggles if the temperature passing its face exĆ ceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the othĆ er components from hi ambient heat.

If this switch is cold it should be closed, sendĆ ing power to one side of another N.C. SPST thermal switch (15). The switch toggles if the

3-9

OPERATION

temperature passing its face exceeds the ratĆ ing on the back of the switch.

NOTE: The switch is located between two conĆ

vection blowers in the rear convection fan compartment. It protects the other components from hi ambient heat.

If this switch is cold it should be closed sending power to the common terminal of a differential pressure switch (16). The pressure switch is made between common and N.C. when the combustion motor (10) is idle. When the comĆ bustion motor reaches full speed the differenĆ tial pressure switch toggles from common and N.C. to common and N.O. sending power to the single solenoid gas valve (17).

NOTE: The differential pressure switch

toggles due to a change in air pressure created by the combustion motor.

4. There are two cooling fans (18) located in the rear convection fan compartment. These fans are activated when the N.O. SPST thermal switch (19) closes due to high ambient heat. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

5. The conveyor is driven by an open loop D.C. control system consisting of a conveyor switch (21), time display (22), 10kW potentiometer (23), D.C. speed control board (24), 180 VDC motor (25) and #10 Hall effect pickup (26). AfĆ ter the conveyor switch is turned on, the time display illuminates. The D.C. control board powers up. The output voltage measured on terminals A1 and A2 of the board to the motor varies from 20 to180 VDC based on the posiĆ tion of the potentiometer. The speed of the moĆ tor should also vary. The time display varies deĆ pending on the speed of the Hall effect pickup. The pickup sends an R.P.M. value to the disĆ play. The display converts this value to minĆ utes:seconds.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from hi ambient heat.

A third cooling fan (18) is located in the control box compartment. This fan is activated when another N.O. SPST thermal switch (20) closes. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the controls from hi ambient heat.

3-10

MT2136

MT2136G CE WITH ATHENA CONTROL - M3163 REV C

COMPONENT REFERENCE

NOTE: Refer to FIGURE 7 page 3-28 for compoĆ

nent locations.

1. BLOWER SWITCH (M0153)

2. TEMPERATURE CONTROLLER (M3155)

3. MOTOR CONTACTOR (M2247)

4. HI/LO LIMIT BOARD (M3150)

5. CONVECTION FANS (Clockwise - M2873, CounterĆclockwise - M2872)

6. THERMOCOUPLES (Dual lead - M3151, Single - M3152)

7. HEAT SWITCH (M0152)

8. CONVECTION PRESSURE SWITCH (M0595)

9. COMBUSTION MOTOR (M2386)

10. BURNER PRESSURE SWITCH (M3330)

11. TPDT RELAY/LATCHING RELAY (M6519)

12. 10 SECOND PURGE TIMER (M3173)

13. SPST RELAY (16775)

14. SPST N.C. THERMAL SWITCH (M1362, L140Ć20F or M2734, L165Ć30F)

15. SPST N.C. THERMAL SWITCH (M1362, L140Ć20F or M2734, L165Ć30F)

16. IGNITION CONTROL MODULE/ LANDIS & GYR (M3168)

17. 2 SECOND PURGE TIMER (M3172)

18. PILOT VALVE (LP - M6001, Natural - M6000)

19. MAIN VALVE (LP - M6001, Natural - M6000)

20. IGNITION ALARM LIGHT (16037)

21. COOLING FANS (23034)

22. SPST N.O. THERMAL SWITCH (M0635, F110Ć20F)

23. SPST N.O. THERMAL SWITCH (M0635, F110Ć20F)

24. CONVEYOR SWITCH (M0152)

25. TIME DISPLAY (M3154)

26. 10kW POTENTIOMETER (M3145)

27. DC SPEED CONTROL BOARD (M3147)

28. 180 VDC MOTOR (M3128) (M3147)

29. #10 HALL EFFECT PICKUP (M3147)

OPERATION

1. Turn the blower switch (1) to ON. The N.O. conĆ tacts close, the N.C. contacts open. 220 or 240 VAC runs to terminal L1 of the temperature controller (2), the coil of the motor contactor (3) and terminals #2 and #7 of the hi/lo limit board (4). Terminal #7 is an output. It remains powĆ ered after the oven is shut down to keep the convection fans (5) operating until the unit reaches 57-77C (135-170F) as sensed by the thermocouples (6).

NOTE: Two thermocouples are located beĆ

tween the middle convection fans in the rear of the oven. One thermocouple provides DC millivolts to the Hi/Lo limit board. The other provides DC milivolts to the temperature controller. Check thermocouples with a millivolt meter.

2. Turn the heat switch (7) to ON. Power goes to the common terminal of the temperature conĆ troller (2) and terminal #5 of the Hi/Lo limit board (4). A switch is made between terminals #5 and #6 of the Hi/Lo board. This switch opens if the oven cavity temperature exceeds 316C (600F). Terminal #6 of the Hi/Lo board is an output and sends power to a convection pressure switch (8). The switch reacts from a vacuum created by the convection fans. If the switch is closed, power runs to the combustion motor (9), the common terminal of the burner pressure switch (10), and terminal #7 of a TPDT relay (11).

NOTE: This relay acts as a latching relay and

remains powered up even after the burner pressure switch changes state.

The burner pressure switch should be made between common and N.C., sending power to terminal #4 and the coil of the latching relay.

3. When the combustion motor (9) reaches full speed, the burner pressure switch (10) toggles between common and N.C. to common and N.O. Power goes to terminal #9 of the latching relay (11). This relay is latched due to voltage passing from terminal #7 through a set of closed contacts to terminal #4 to its coil. A set of contacts are also closed between terminals #9 and #6 of the same relay, sending power to a 10 second purge timer (12). When the timĆ

3-11

OPERATION

er times out, power goes to the coil of a SPST relay (13), allowing its contacts to close.

4. On a call for heat from the temperature controlĆ ler (2), as sensed by the thermocouples, a set of contacts closes sending power out of the N.O. terminal of the temperature controller to one side of a N.C. SPST thermal switch (14). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the othĆ er components from hi ambient heat.

If this switch is cold it should be closed, sendĆ ing power to one side of another N.C. SPST thermal switch (15). The switch toggles if the temperature passing its face exceeds the ratĆ ing on the back of the switch.

NOTE: The switch is located between two conĆ

vection blowers in the rear convection fan compartment. It protects the other components from hi ambient heat.

If this switch is cold it should be closed sending power to one side of the SPST relay (13). This relay was closed shortly after the 10 second purge timer (12) timed out. Power is sent to terĆ minal #1 of the Landis and Gyr ignition control system (16). Terminal #8 of the ignition control module is an output. It sends power to a 2 secĆ ond purge timer (17) and the pilot valve (18). The main valve (19) opens when the 2 second purge timer times out. If the ignition control senses a flame the system remains energized. If not, the control locks out within 1 to 3 secĆ onds. The ignition alarm light (20) illuminates.

NOTE: This system is polarity specific. If the

unit locks out repeatedly and the D.C. microamps are within the acceptable range, check for proper polarity.

switch (22) closes due to high ambient heat. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from hi ambient heat.

A third cooling fan (21) is located in the control box compartment. This fan is activated when another N.O. SPST thermal switch (23) closes. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The switch is located in the slide out

control compartment. It protects the controls from hi ambient heat.

7. The conveyor is driven by an open loop D.C. control system consisting of a conveyor switch (24), time display (25), 10kW potentiometer (26), D.C. speed control board (27), 180 VDC motor (28) and #10 Hall effect pickup (29). AfĆ ter the conveyor switch is turned on, the time display illuminates. The D.C. control board powers up. The output voltage measured on terminals A1 and A2 of the board to the motor varies from 20 to180 VDC based on the posiĆ tion of the potentiometer. The speed of the moĆ tor should also vary. The time display varies deĆ pending on the speed of the Hall effect pickup. The pickup sends an R.P.M. value to the disĆ play. The display converts this value to minĆ utes:seconds.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

5. When power is applied to the coil of the motor contactor (3) the contacts close sending powĆ er to the two convection fans (5) located in the rear of the oven.

NOTE: Terminals #13 and #14 of the motor

contactor act as a hood interlock. They are sometimes used as a means of starting the hood.

6. There are two cooling fans (21) located in the rear convection fan compartment. These fans are activated when the N.O. SPST thermal

3-12

MT2136

MT2136G DOMESTIC WITH REMOTE COMPUTER CONTROL - M3476 REV B

COMPONENT REFERENCE

NOTE: Refer to FIGURE 8 page 3-29 for compoĆ

nent locations.

1. COMPUTER (FW525)

2. BELT STOP RELAY (22672)

3. BLOWER RELAY (22672)

4. HEAT RELAY (22672)

5. DC SPEED CONTROL BOARD (M2379)

6. MANUAL RESETABLE HI LIMIT SWITCH (M3295)

7. 115/24 VAC STEP DOWN TRANSFORMER (M2381)

8. COMBUSTION MOTOR (22132)

9. CENTRIFUGAL SWITCH

10. IGNITION MODULE (M1054)

11. PILOT VALVE (LP - 22190, Natural - M5495)

12. BURNER VALVE (LP - 22190, Natural - M5495)

13. MOTOR CONTACTOR (M0708)

14. CONVECTION FANS (Clockwise - M2871, CounterĆclockwise - M2870)

15. SPDT THERMAL SWITCH (M2453 L140-20F)

16. COOLING FANS (M2469)

17. RTD PROBE (M7427)

18. SPST THERMAL SWITCH (M1362 L140-20F, M2734 L165-30F)

19. BURNER CONTROL VALVE (20287)

20. FLAME BLOWER (22258)

21. 130 VDC MOTOR (M2378)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (1). The belt stop relay (2), blower relay (3) and the heat relay (4) energize powering up the oven.

2. When the belt stop relay closes, 120 VAC goes to the DC speed control board (5) and the manual resetable hi limit switch (6). The high limit switch is a bulb and capillary style switch. It reacts when the oven cavity temperature exĆ ceeds the high limit programmed into the cooking computer.

If the high limit switch is closed power flows to the primary side of a 115/24 volt step down transformer (7) and the combustion motor (8) of the flame blower. The combustion motor powers up. When the combustion motor reaches full speed, a centrifugal switch (9) closes sending 24 VAC to the ignition module (10). After the module's self diagnostics are complete, the pilot valve (11) opens. When a proof of flame is established the main burner valve (12) powers up.

3. The blower relay (3) sends 115 volts to the coil of the motor contactor (13) starting the two convection fans (14) in the rear of the oven. This contactor also supplies power to the N.C. terminal of a SPDT thermal switch (15). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch and may start the fans even if the oven is off. If this switch is cold, it should be made between common and N.C. terminals sending power to the cooling fans (16).

NOTE: The SPDT thermal switch is located in

the junction box in the rear of the oven in the blower compartment.

4. On a call for heat from the cooking computer (1), as sensed by an RTD probe (17), the heat relay (4) closes sending 115 VAC to one termiĆ nal of a N.C. SPST thermal switch (18). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch. If the switch is closed, 115 VAC is delivĆ ered to the burner control valve (19). This valve opens sending gas to the flame blower (20) for ignition.

NOTE: The RTD probe is located in front of the

combustion motor. It should be checked

3-13

with an ohm meter. The SPST thermal switch is located in the rear of the conĆ vection fan compartment.

5. The conveyor is driven by an open loop DC control system consisting of a DC speed conĆ trol board (5), a 130 VDC motor (21) and the DAC located in the cooking computer (1). If a time is programmed into the cooking computĆ er, a voltage ranging between .47 and 4.7 is apĆ plied to the DC speed control board. The outĆ put voltage measured at A1 and A2 of the board to the motor varies from 20 to130 VDC based on the DAC voltage applied to the board or the time programmed into the computer.

NOTE: The DAC receives 20 VDC from the

speed control boards. The DAC reĆ turns a portion of the voltage (between .47 and 4.7 VDC). The amount of voltĆ age is dependent on the time proĆ grammed into the computer.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

OPERATION

NOTE: This oven, supplied with remote conĆ

trol, is equipped with an emergency shut down switch. Should you need to stop the belt, fans, or heat press the emergency switch. Do not use the

emergency switch as a GENERAL on/off switch!

3-14

MT2136

MT2136G DOMESTIC WITH OPEN LOOP COMPUTER CONTROL - M3717 REV B

COMPONENT REFERENCE

NOTE: Refer to FIGURE 9 page 3-30 for compoĆ

nent locations.

1. COMPUTER (FW525)

2. BELT STOP RELAY (22672)

3. BLOWER RELAY (22672)

4. HEAT RELAY (22672)

5. DC SPEED CONTROL BOARD (M2379)

6. MANUAL RESETABLE HI LIMIT SWITCH (M3295)

7. 115/24 VAC STEP DOWN TRANSFORMER (M2381)

8. COMBUSTION MOTOR (22132)

9. CENTRIFUGAL SWITCH

10. IGNITION MODULE (M1054)

11. PILOT VALVE (LP - 22190, Natural - M5495)

12. BURNER VALVE (LP - 22190, Natural - M5495)

13. MOTOR CONTACTOR (M0708)

14. CONVECTION FANS (Clockwise - M2871, CounterĆclockwise - M2870)

15. SPDT THERMAL SWITCH (M2453 L140-20F)

16. COOLING FANS (M2469)

17. SPST THERMAL SWITCH (M0635 F10-20)

18. RTD PROBE (M7427)

19. SPST THERMAL SWITCH (M1362 L140-20F, M2734 L165-30F)

20. BURNER CONTROL VALVE (20287)

21. FLAME BLOWER (22258)

22. 130 VDC MOTOR (M2378)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (1). The belt stop relay (2), blower relay (3) and the heat relay (4) energize powering up the oven.

NOTE: The SPDT thermal switch is located in

a junction box in the convection fan compartment.

If this switch is cold, it should be made beĆ tween common and N.C. terminals sending power to the two cooling fans (16) located in the rear of the oven. These cooling fans protect the convection fans from high ambient heat. Two additional cooling fans (16) are located in the cooking computer control area and are acĆ tivated when a SPST N.O. thermal switch (17) closes. The switch toggles if the temperature passing its face exceeds the rating on the back of the switch and may start the fans even if the oven is off.

NOTE: The SPST N.O. thermal switch is located

in the cooking computer compartment.

3-15

OPERATION

4. On a call for heat from the cooking computer (1), as sensed by an RTD probe (18), the heat relay (4) closes sending 115 VAC to one termiĆ nal of a N.C. SPST thermal switch (19). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch. If the switch is closed, 115 VAC is delivĆ ered to the burner control valve (20). This valve opens sending gas to the flame blower (21) for ignition.

NOTE: The RTD probe is located in front of the

combustion motor. It should be checked with an ohm meter. The SPST thermal switch is located in the rear of the convection fan compartment.

5. The conveyor is driven by an open loop DC control system consisting of a DC speed conĆ trol board (5), a 130 VDC motor (22) and the DAC located in the cooking computer (1). If a time is programmed into the cooking computĆ er, a voltage ranging between .47 and 4.7 is apĆ plied to the DC speed control board. The outĆ put voltage measured at A1 and A2 of the board to the motor varies from 20 to130 VDC based on the DAC voltage applied to the board or the time programmed into the computer.

NOTE: The DAC receives 20 VDC from the

speed control boards. The DAC reĆ turns a portion of the voltage (between .47 and 4.7 VDC). The amount of voltĆ age is dependent on the time proĆ grammed into the computer.

NOTE: This type of system does not sense the

weight of the product and will slow down slightly if the belt is fully loaded.

3-16

MT2136

MT2136G DOMESTIC WITH CLOSED LOOP COMPUTER CONTROL - M7287 REV A

COMPONENT REFERENCE

NOTE: Refer to FIGURE 10 page 3-31 for compoĆ

nent locations.

1. COMPUTER (FW525)

2. BELT STOP RELAY (22672)

3. BLOWER RELAY (22672)

4. HEAT RELAY (22672)

5. DC SPEED CONTROL BOARD (M2379)

6. SPST THERMAL SWITCH (M1362)

7. HIGH LIMIT SWITCH (M3295)

8. 120/24 VAC STEP DOWN TRANSFORMER (M2352)

9. COMBUSTION MOTOR (M0767)

10. CENTRIFUGAL SWITCH

11. IGNITION MODULE (M1054)

12. PILOT VALVE (LP - 22190, Natural - M5495)

13. BURNER VALVE (LP - 22190, Natural - M5495)

14. MOTOR CONTACTOR (M0708)

15. CONVECTION FANS (Clockwise - M2871, CounterĆclockwise - M2870)

16. SPDT THERMAL SWITCH (M2453 L140-20F)

17. COOLING FAN (M2469)

18. RTD PROBE (M7427)

19. VDC MOTOR (M2378)

20. HALL EFFECT PICKUP (M0984)

21. COOLING FANS (M2469)

22. SPDT THERMAL SWITCH (M2453 L140-20F)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (1). The belt stop relay (2), blower relay (3) and the heat relay (4) energize powering up the oven.

2. When the belt stop relay closes, 120 VAC goes to the DC speed control board (5) and one terĆ minal of a N.C. SPST thermal switch (6). If the thermal switch is closed, 120VAC is sent to the common terminal of a manual resettable hi limĆ it switch (7). The high limit switch is a bulb and capillary style switch. It reacts when the oven cavity temperature exceeds the high limit proĆ grammed into the cooking computer.

NOTE: The single pole single throw N.C. therĆ

mal switch is a high limit device located between the two blowers in the rear convection fan compartment. This switch opens when the temperature passing its face exceeds the rating on the back of the switch and closes when there is a 10Ć205 drop in temperature across the face of the switch.

If the high limit switch is closed power flows to the primary side of a 115/24 volt step down transformer (8) and the combustion motor (9) of the flame blower. The combustion motor powers up. When the combustion motor reaches full speed, a centrifugal switch (10) closes sending 24 VAC to the ignition module (11). After the module's self diagnostics are complete, the pilot valve ) opens. When a proof of flame is established the main burner valve (13) powers up.

3. The blower relay (3) sends 115 volts to the coil of the motor contactor (14) starting the two conĆ vection fans (15) in the rear of the oven. Power is also applied to the N.C. terminal of a SPDT thermal switch (16). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch and may start the fans even if the oven is off. If this switch is cold, it should be made between common and N.C. terĆ minals sending power to the cooling fan (17).

NOTE: The SPDT thermal switch is located in

the cooking computer control compartĆ ment.This switch toggles when the temĆ perature passing its face exceeds the rating on the back of the switch and

3-17

OPERATION

closes when there is a 10Ć205 drop in temperature across the face of the switch.

4. On a call for heat from the cooking computer (1), as sensed by an RTD probe (18), the heat relay (4) closes sending 24 VAC to the burner control valve (13). This valve opens sending gas to the flame blower for ignition.

NOTE: The RTD probe is located in front of the

combustion motor. It should be checked with an ohm meter.

5. The conveyor belt is driven by a closed loop D.C. drive system consisting of a 130 VDC moĆ tor (19), a #2 Hall effect pickup (20), a DC speed control board (5) and the DAC located in the cooking computer. The motor speed varĆ ies based on the time programmed into the cooking computer. If time is programmed, a voltage from .3 to 3.8 is applied to the DC speed control board. The output voltage meaĆ sured at terminals A1 and A2 varies from 20 to 130 VDC based on the DAC voltage applied to the board or the time programmed into the computer.

6. There are two cooling fans (21) located in the rear convection fan compartment and one loĆ cated in the control compartment. These fans are activated when the belt stop relay (2) is enĆ ergized. The fans are also activated when a SPDT thermal switch (22) toggles from comĆ mon/NC to common NO. The switch toggles due to high ambient heat. It will toggle if the temperature passing its face exceeds the ratĆ ing on the back of the switch.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from hi ambient heat.

NOTE: The DAC receives 20 VDC from the

speed control board. The DAC returns a portion of the voltage (between .3 and 3.8 VDC). The amount of voltage is dependent on the time programmed into the computer.

NOTE: This type of system does sense the

weight of the product and will not slow down if the belt is fully loaded.

NOTE: The control voltage is supplied by a

240/120 step down transformer (8). The transformer is located in the conĆ trol compartment.

3-18

MT2136

MT2136E CE WITH CLOSED LOOP COMPUTER CONTROL - M6476 REV B

COMPONENT REFERENCE

NOTE: Refer to FIGURE 11 page 3-32 for compoĆ

nent locations.

1. COMPUTER (FW525)

2. BELT STOP RELAY (22672)

3. BLOWER RELAY (22672)

4. HEAT RELAY (22672)

5. MOTOR CONTACTOR (M0708)

6. SPDT THERMAL SWITCH (M2453 L140-20F)

7. SPDT THERMAL SWITCH (M2453 L140-20F)

8. COOLING FANS (M2469)

9. CONVECTION FANS (Clockwise - M2873, CounterĆclockwise - M2872)

10. RTD PROBE (M7427)

11. SPST THERMAL SWITCH (M1362 L140-20F, M2734 L165-30F)

12. MANUAL RESETABLE HIGH LIMIT SWITCH (M3295)

13. HEATING ELEMENT CONTACTOR (R1530)

14. HEATING ELEMENTS (M2573)

15. 130 VDC MOTOR (M2378)

16. #2 HALL EFFECT PICKUP (M0984)

17. DC SPEED CONTROL BOARD (M2379)

18. STEP DOWN TRANSFORMER (M7170)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (1). The belt stop relay (2), blower relay (3) and the heat relay (4) energize powering up the oven.

2. The blower relay (3) closes sending power to the motor contactor (5) and the N.C. terminals of two SPDT thermal switches (6 and 7). The switches toggle if the temperature passing their faces exceeds the rating on the back of the switches and may start the fans even if the oven is off.

NOTE: One of the thermal switches is located

in the junction box in the convection fan compartment. The other thermal switch is located in the cooking comĆ puter compartment.

Two cooling fans (8) are located in the rear of the oven. These cooling fans protect the conĆ vection fans from high ambient heat. Two addiĆ tional cooling fans (8) are located in the comĆ puter control compartment. These cooling fans protect the controls from high ambient heat.

The motor contactor (5) closes energizing the two convection fans (9) in the rear of the oven.

3. On a call for heat from the cooking computer (1), as sensed by an RTD probe (10), the heat relay (4) closes sending 115 VAC to one termiĆ nal of a N.C. SPST thermal switch (11). The switch toggles if the temperature passing its face exceeds the rating on the back of the switch.

NOTE: The RTD probe is located in the control

compartment. It should be checked with an ohm meter. The SPST thermal switch is located in the rear of the conĆ vection fan compartment.

If the switch is closed, 115 VAC is delivered to one terminal of the manual resetable high limit switch (12). The high limit switch is a bulb and capillary style switch. It reacts when the oven cavity temperature exceeds the high limit proĆ grammed into the cooking computer.

If the manual resetable high limit switch (12) (12) is closed power is sent to the contact coil of the heatIng element contactor (13) energizĆ ing the heating elements (14).

3-19

4. The conveyor belt is driven by a closed loop D.C. drive system consisting of a 130 VDC moĆ tor (15), a #2 Hall effect pickup (16), a DC speed control board (17) and the DAC located in the cooking computer. The motor speed varĆ ies based on the time programmed into the cooking computer. If time is programmed, a voltage from .3 to 3.8 is applied to the DC speed control board. The output voltage meaĆ sured at terminals A1 and A2 varies from 20 to 130 VDC based on the DAC voltage applied to the board or the time programmed into the computer.

NOTE: The DAC receives 20 VDC from the

speed control board. The DAC returns a portion of the voltage (between .3 and 3.8 VDC). The amount of voltage is dependent on the time programmed into the computer.

NOTE: This type of system does sense the

weight of the product and will not slow down if the belt is fully loaded.

OPERATION

NOTE: The control voltage is supplied by a

240/120 step down transformer (18). The transformer is located in the control compartment.

3-20

MT2136

MT2136G CE WITH COMPUTER CONTROL - M7290 REV E

COMPONENT REFERENCE

NOTE: Refer to FIGURE 12 page 3-33 for compoĆ

nent locations.

1. BLOWER RELAY (22672)

2. MOTOR CONTACTOR (M2247)

3. CONVECTION FANS (CCW) (M2872)

4. CONVECTION FANS (CW) (M2873)

5. CONVECTION PRESSURE SWITCH (M0595)

6. BELT STOP RELAY (22672)

7. DC SPEED CONTROL BOARD (M3153)

8. MANUAL RESET HI LIMIT SWITCH (M3295)

9. HEAT RELAY (22672)

10. SINGLE POLE SINGLE THROW THERMAL SWITCH (M1362)

11. SINGLE POLE SINGLE THROW RELAY (16775)

12. TRIPLE POLE DOUBLE THROW RELAY (90250)

13. TEN SECOND PURGE TIMER (M3173)

14. DIFFERENTIAL BURNER PRESSURE SWITCH (M2819)

15. COMBUSTION BLOWER MOTOR (M2386)

16. LANDIS & GYR IGNITION CONTROL SYSTEM (M3168)

17. 2 SECOND TIMER (M3172)

18. DUAL SOLENOID GAS VALVE (Natural - M6000, LP - M6001)

19. COOKING COMPUTER (M7880)

20. RTD PROBE (M7427)

21. SINGLE POLE DOUBLE THROW THERMAL SWITCH (M2453)

22. COOLING FAN (23034)

23. SINGLE POLE DOUBLE THROW THERMAL SWITCH (M2453)

24. DC Motor (M3128)

25. COOLING FANS (23034)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (19). The blowĆ er relay (1), belt stop relay (6) and heat relay (9) pull in and power up three separate circuits. The voltage to the relay coils is 12 VDC.

2. The blower relay (1) closes sending 230 volts to the coil of the motor contactor (2). Points 1, 2, 5 and 6 close powering the convection fans (3 &

4).

3. The convection fan pressure switch (5) closes due to the vacuum that is established in the burner tube chamber by the operation of the convection fans.

4. The belt stop relay (6) sends 230 volts to the DC drive board (7) and the manual reset hi limit switch (8). The DC motor (24) starts provided there is a time entered in the cooking computer (19).

NOTE: The motor used in this oven is 180 volts

DC at its highest speed.

NOTE: This relay will only be powered if there

is a time programmed into the computĆ er. THE OVEN WILL NOT HEAT IF TIME IS NOT PROGRAMMED INTO THE COMPUTER.

5. The heat relay (9) sends 230 volts to a single pole single throw thermal switch (10). If closed the relay continues to send power to one side of a single pole single throw relay (11). This relay will not see power at it's coil until a triple pole double throw relay (12) closes and the ten second timer (13) counts down.

6. Once the convection fan pressure switch (5) closes, 230 volts go to a differential pressure switch (14), the combustion blower motor (15), terminal #7 and the coil of the triple pole double throw relay (12).

7. When a differential is sensed at the differential pressure switch (14) the switch changes posiĆ tion allowing power to go to terminal #9 of the triple pole double throw relay (12). This relay is a latching relay and is held closed by power that was applied at terminal #7.

3-21

OPERATION

8. Power flows from terminal #8 of the triple pole double throw relay (12) to a ten second purge timer (13). This timer allows the combustion blower (15) to operate for ten seconds allowing the combustion chamber to clear of any comĆ bustible gasses.

9. After the timer times out the voltage is applied to the other side of the coil of the single pole single throw relay (11). When that set of conĆ tacts closes, voltage goes to terminal #1 of the Landis & Gyr ignition control system (16). TerĆ minal #8 will send power to one side of a two second timer (17) and the pilot coil of the dual solenoid gas valve (18). After two seconds elapse, the voltage is applied to the main coil of the dual solenoid gas valve (18). This voltĆ age will remain provided there is a call for heat from the computer (19). If proof of flame is strong the ignition system stays powered up. Should the flame signal be lost, the ignition control system will lock out.

NOTE: Cooking computer receives informaĆ

tion from an RTD probe (20) located in front of the combustion blower motor. The information is in the form of resistĆ ance. The resistance ascends as temĆ perature increases.

11. When power is applied to the motor contactor coil voltage is also applied to the NC terminal of a single pole double throw thermal switch (21). This switch in a cold state should be made between NC and common powering up the cooling fan (22) located in the cooking computer compartment.

NOTE: The single pole double throw switch

powers up the cooling fan even if the oven is turned off.

12. When the motor contactor (2) closes, power goes to the NC terminal of a single pole double throw thermal switch (23). This switch in a cold state should be made between NC and comĆ mon powering up cooling fans (25) located in the rear of the oven.

NOTE: The single pole double throw switch

powers up the cooling fan even if the oven is turned off. This switch is loĆ cated in the rear of the oven.

10. Two sets of contacts are used as a hood interĆ lock in the motor contactor (2), terminals #13 and #14. At this point there is no power to these terminals, they act only as a switch to turn on the hood when the oven is turned on.

NOTE: This is an option that the customer may

use, it is not a requirement.

3-22

MT2136

MT2136G GENERAL EXPORT - M7295 REV B

COMPONENT REFERENCE

NOTE: Refer to FIGURE 13 page 3-34 for compoĆ

nent locations.

1. COOKING COMPUTER (M7880)

2. BLOWER RELAY (22672)

3. BELT STOP RELAY (22672)

4. HEAT RELAY (22672)

5. MOTOR CONTACTOR (M2247)

6. CONVECTION FANS (CCW) (M2872)

7. CONVECTION FANS (CW) (M2873)

8. DC DRIVE BOARD (M3153)

9. SINGLE POLE SINGLE THROW THERMAL SWITCH (M1362)

10. DC MOTOR (M3128)

11. MANUAL RESET HI LIMIT SWITCH (M3295)

12. TRANSFORMER (M2381)

13. FLAME BLOWER (M2386)

14. CENTRIFUGAL SWITCH

15. IGNITION CONTROL MODULE (M1054)

16. PILOT VALVE (Natural - M5495, LP - 22190)

17. MAIN BURNER VALVE (Natural - M5495, LP - 22190)

18. RTD PROBE (M7427)

19. STEP DOWN TRANSFORMER (M7170)

20. HALL EFFECT PICKUP (M0984)

21. COOLING FANS (23034)

22. SINGLE POLE DOUBLE THROW THERMAL SWITCH (M2453)

OPERATION

1. Apply power to the oven. Program the time and temperature into the computer (1). The blower relay (2), belt stop relay (3) and heat relay (4) pull in and power up three separate circuits. The voltage to the relay coils is 12 VDC.

2. The blower relay (2) closes sending 115VAC to the coil of the motor contactor (5). Points 1, 2, 3 and 4 close powering the convection fans (6 & 7).

NOTE: 115 volts is applied to one side of the

relays from a 240Ć120 volt step down transformer (19).

3. The belt stop relay (3) sends 115VAC to the DC drive board (8) and one side of a single pole single thermal switch (9). The DC motor (10) starts provided there is a time entered in the cooking computer (1).

NOTE: The thermal switch is located in the

rear of the blower compartment. This switch opens when the face of the switch sees 1405F and closes when there is a 10Ć205 drop in temperature across the face of the switch. The switch interrupts the heat circuit.

NOTE: 115 volts is applied to one side of the

relays from a 240Ć120 volt step down transformer (19).

NOTE: The motor used in this oven is 180 volts

DC at its highest speed.

NOTE: This relay will only be powered if there

is a time programmed into the computĆ er. THE OVEN WILL NOT HEAT IF TIME IS NOT PROGRAMMED INTO THE COMPUTER.

4. If the thermal switch is closed, power goes to one terminal of the manual reset hi limit switch (11). If the hi limit switch is closed, power is supplied to the primary side of the transformer (12) and the flame blower (13).

5. When the combustion motor reaches full speed, a centrifugal switch (14) closes sendĆ ing 24 VAC to the ignition module (15). After the module's self diagnostics are complete, the pilot valve (16) opens. When a proof of flame is established the main burner valve (17) is allowed to open.

3-23

OPERATION

6. On a call for heat from the cooking computer (1), as sensed by an RTD probe (18), the heat relay (4) closes sending 24 VAC to the main burner valve (17). This valve opens sending gas to the flame blower (13) for ignition.

NOTE: The RTD probe is located in front of the

combustion motor. It should be checked with an ohm meter.

7. The conveyor belt is driven by a closed loop D.C. drive system consisting of a 130 VDC moĆ tor (10), a #2 Hall effect pickup (20), a DC speed control board (8) and the DAC located in the cooking computer. The motor speed varĆ ies based on the time programmed into the cooking computer. If time is programmed, a voltage from .3 to 3.8 is applied to the DC speed control board. The output voltage meaĆ sured at terminals A1 and A2 varies from 20 to 130 VDC based on the DAC voltage applied to the board or the time programmed into the computer.

NOTE: The DAC receives 20 VDC from the

speed control board. The DAC returns a portion of the voltage (between .3 and 3.8 VDC). The amount of voltage is dependent on the time programmed into the computer.

8. There are two cooling fans (21) located in the rear convection fan compartment and one loĆ cated in the computer control compartment. These fans are activated when the belt stop relay (3) is energized. The fans are also actiĆ vated when a single pole double throw thermal switch (22) toggles from common/NC to comĆ mon NO. The switch toggles due to high ambiĆ ent heat. It will toggle if the temperature passĆ ing its face exceeds the rating on the back of the switch.

NOTE: The switch is located between the two

blowers in the rear convection fan compartment. It protects the convecĆ tion fans from high ambient heat.

NOTE: This type of system does sense the

weight of the product and will not slow down if the belt is fully loaded.

3-24

MT2136

13 13

FIGURE 4

3-25

OPERATION

FIGURE 5

3-26

MT2136

14 15

FIGURE 6

3-27

OPERATION

8 10

FIGURE 7

3-28

MT2136

2 4

14 14

FIGURE 8

3-29

OPERATION

1414

3 2 4

FIGURE 9

3-30

MT2136

FIGURE 10

3-31

OPERATION

9 9

3 2 4

8 8

FIGURE 11

3-32

MT2136

6 9

FIGURE 12

3-33

OPERATION

FIGURE 13

3-34

MT2136

OVEN ADJUSTMENTS FOR COOKING

The combination of belt time, oven temperature, and air flow are important for achieving quality reĆ sults from your Blodgett conveyor oven. Use the following guidelines to adjust the belt time and oven temperature of your unit. For questions reĆ garding further oven adjustments, please contact your local Blodgett Sales Representative for assisĆ tance.

CONVEYOR SPEED AND OVEN TEMPERATURE

Conveyor belt speed (cook time) and oven temperĆ ature are the two variables used when fine tuning your oven for a specific product. To determine the optimum bake time and temperature, make small changes for each trial and keep one variable constant. For example, if the oven temperature is 460F (238C) and the belt speed is 7 minutes, but the pizza is not browned enough, increase the temĆ perature to 475F (246C) and keep the belt speed the same. However, if the center of the pizza is not completely cooked, keep the oven temperature the same, and increase the bake time to 7 minutes and 30 seconds. In general, raise the bake temperĆ ature to increase browning, and lengthen the belt time to increase doneness.

FINISHED PRODUCT TEMPERATURES

Internal temperatures of the cooked products should be measured immediately after the product exits the cooking chamber to ensure a safe food temperature. Internal pizza temperatures should be over 165F (74C). Minimum temperature guidelines vary depending on the food items.

Air flow adjustments may be necessary to fine tune the oven for your particular product. The air plates, located at the top of the baking chamber, contain holes that can be covered using BlockĆoff Plates. The plates can easily be adjusted to regulate the air flow for your particular needs. Use the following guidelines to adjust the BlockĆoff Plates.

1. Ensure the oven is Off and completely cooled.

2. Open the front access door.

3. Using the supplied air plate hook, pull the air plates out of the oven.

4. Remove the wing nuts, screws, and washers holding the BlockĆoff Plates.

5. Adjust the plates.

6. Replace the wing nuts, screws, and washers to tightly secure the BlockĆoff plates in their new locations. Make a sketch of the final airĆ plate setup for future reference.

NOTE: One or two blockĆoff plates may be left

off entirely if appropriate to obtain the desired results.

7. Replace the air plates, and close the front acĆ cess door.

The following examples illustrate air flow regulaĆ tion.

NOTE: The first half of the oven chamber greatly afĆ

fects the initial baking of the product, while the last half largely affects the browning.

 A good bake time and temperature have been

established, but more top browning is desired. Slide one of the BlockĆoff Plates to uncover a row of holes toward the exit end of the oven.

 The bottom of the pizza is golden brown, but

the top is too dark. Close rows at the exit end of the oven to reduce final browning.

 The center of the pizza is still doughy and the

toppings are not fully cooked. Open up rows at the chamber entrance and close rows at the chamber exit.

3-35

CHAPTER 4

CALIBRATION AND

ADJUSTMENT

MT2136

CONVECTION BLOWER MOTORS

TO CHECK MOTOR ROTATION

1. Remove the back of the oven body and verify proper motor rotation. (See FIGURE 1)

For motor placement, the direction of rotation is viewed left to right from the oven's rear. Typically the motor direction is referenced to the end of the shaft (EOS). However due to the vertical positionĆ ing of the motors in Blodgett Conveyor ovens, it is more instructive to reference the end of the motor (EOM) as looking from the rear of the oven. In FIGURE 1 all directions are taken from EOM. The correct rotation amperage draw is approximately 1 amp. If the measured amperage is less than .5, check for proper motor rotation direction.

Slinger

Blower

Motor

Cooling Blade

TO CHECK LOWĆLIMIT

1. Turn the oven on and let it heat up to approxiĆ mately 200F (93C).

2. Shut the oven off. The blowers should come back on in several seconds.

3. When the blowers shut off, turn the oven on.

If computer controlled press the ACT TEMP" key to verify that the blowers shut off between 135F (57C) and 170F (77C). If the blowers do not shut off refer to the Troubleshooting section page 5-3.

For standard controls, turn the blower switch to on to record the temperature. Adjust the hi/ lo board if necessary. See page 4-4 for temĆ perature calibration procedure.

BLOWER WHEEL ROTATION

Control

Box

Motor

(Side view)

Motor

FIGURE 1

4-1

Motor #1

(CW)

(Top view)

Control

Box

Motor #2

(CCW)

REGULATED GAS PRESSURE

CALIBRATION AND ADJUSTMENT

1. Let the oven run up to 510F (266C). You may now verify the operational and regulated gas pressures.

Incoming static gas pressure to the unit, with all the gas appliances drawing from the supply, should be a minimum of 5.5" W.C. (13.7 mbar) for natural gas and 11" W.C. (28 mbar) for propane gas. The manĆ ifold pressure, if measured after the regulator loĆ cated inside the control box, must be 3.5" W.C. (9 mbar) for natural gas and 10" W.C. (25 mbar) for propane gas. For CE pressures reference TABLE 2 on page 1-3 of the Introduction.

The pressure can be checked at the tap on the dual regulated gas valve or at the tap on the tee valve.

Pressure

Ta p

Regulator Cap

Regulator

Adjustment

If pressure adjustments are needed, turn the adĆ justing screw located under a screw cap of the dual regulated valve. Adjust the gas pressure by turning the screw clockwise to raise the gas pressure and counterĆclockwise to lower the gas pressure. Be sure to reinstall the screw cap; should the diaĆ phragm rupture this cap acts as a flow limiter.

The air shutter disc on the burner blower motor, loĆ cated inside the control box at the top of the asĆ sembly, is factory adjusted to provide the most effiĆ cient blue flame possible at sea level. Visually examine the flame to verify it's quality. Should it need adjustment, increase or decrease the air mixĆ ture to attain the best flame quality.

Pressure Tap

Inlet

Regulator

Cap

Regulator

Adjustment

Outlet Pressure Ta p

Pressure Regulator (U.S. models)

FIGURE 2

Setting Equipment for Other Types of Gas - CE Models

1. Shut off the gas valve and turn off the operating switch.

2. Dismantle the gas block by means of couĆ plings.

3. Dismantle the main burner and replace the inĆ jector.

4. Install the burner and gas block.

5. Check for leakage and possible loose electriĆ cal connections.

6. Adjust gas pressure if necessary. See FIGURE 3.

Pressure Regulator (Some export models)

Gas Pressure Adjustment

Pressure Ta p

Pressure Regulator (CE models)

FIGURE 3

4-2

MT2136

STANDARD CONTROLLER CONFIGURATION

BELT SPEED CALIBRATION - OPEN LOOP

NOTE: The following procedures must be perĆ

formed after dc voltage levels have been set and are known to be accurate.

The cooking time digital display should be adĆ justed when changing any of the system compoĆ nents. Prior to adjusting the display, determine the following two specifications:

1. The number of pulses per spindle revoluĆ

tion generated by the Hall effect pickup.

Move the plastic endĆcaps on the pickup loĆ cated on the DC motor. If the pickup is marked with the number 2, it is a single pulse per revoĆ lution pickup. If the pickup is marked with the number 10 (Standard After 6Ć1Ć91) it is a five pulse per revolution pickup. Replace the endĆ caps.

2. The manufacturer and the voltage rating of

the DC drive motor.

This information is embossed on the nameĆ plate located on the motor's case.

Once the above specifications have been deterĆ mined, perform the following calibration proceĆ dures.

1. Remove the screws securing the cooking time display lens cover. Remove the lens cover. If a 5 pulse pickup is used, verify that the multiplier potentiometer is set to the x10 position (refer to FIGURE 4 for the potentiometer location).

Belt speed DIP switch located

behind cooking time digital display

Cooking Time

Set The Belt Speed DIP Switches.

Belt speed DIP switch settings are specified by the following equations:

 60Hz motors with a single pulse pickup use:

36 x Motor RPM x .275

 60Hz motors with a five pulse pickup use:

36 x Motor RPM x .325

 50Hz motors with a single pulse pickup

use:ą36 x Motor RPM x .65

 50Hz motors with a five pulse pickup use:

36 x Motor RPM x .325

NOTE: Refer to TABLE 3 to determine Motor RPM.

Bodine Motors RPM

130VDC (Standard after 9/15/90) 4.2

180VDC (50Hz Only) 4.2

TABLE 3

The DIP switch summed values should match the value obtained in the previous equation. Move the appropriate DIP switches to OFF.

EXAMPLE: For a switch value of 73 (from the motor formula and TABLE 3), set switches 7, 4 and 1 to OFF since the total of these switches is 73 (64+8+1=73).

Rear Of

Control

OFF

Switch Number

8 7 6 5 4 3 2 1

INCREASE DECREASE

Multiplier potentiometer located behind

X10

cooking time digital display

For 5 pulse pickups set to x10

FIGURE 4

128 64 32 16 8 4 2 1

Switch Value

Switch Setting For A Value Of 73

FIGURE 5

4-3

CALIBRATION AND ADJUSTMENT

TEMPERATURE CALIBRATION - UNITED ELECTRIC CONTROLLER

NOTE: Th U.E. and Zytron boards get input from eiĆ

ther single or dual lead thermocouples.

LOW LIMIT ADJUSTMENT

1. Bring the oven to 200F (93C).

2. Turn both the blower and the heat switches to OFF. The blower should continue to run.

3. Monitor the digital temperature control display. The blower motors should shut off within the range of 170Ć135Fāāā(77Ć57C).

4. To adjust the temperature, turn the lowĆlimit potentiometer. A clockwise rotation increases the setting, counterĆclockwise decreases it. See FIGURE 6.

TEMPERATURE CALIBRATION

1. With the conveyor turned off, place a pyromeĆ ter in the center of the oven cavity.

2. Adjust the set point for 500F (260C). Monitor the Indicator Lamp. See FIGURE 6. When the lamp goes out, compare the pyrometer with the temperature of the display. If the display difĆ fers by +/Ć5F (3C), open the access panel on the temperature controller and continue with STEPS 3 and 4.

lowers the display reading and raises the temĆ perature. A counterĆclockwise rotation raises the reading and decreases the temperature. Check the oven set point. Adjustment of the potentiometer may affect this reading. Bring the oven up to 525F (274C). Verify the caliĆ bration.

4. Set Point Adjustment Ć Adjust the Coarse ManĆ ual so the controller calls for heat at 522F (272C) and shutĆoffs at 525F (274C). A clockwise rotation raises the temperature, counterĆclockwise lowers it.

HIGH LIMIT ADJUSTMENT

1. Turn both the blower and the heat switches to ON.

2. Set the temperature to 620F (327C). When the display reads 600F (316C), the burner blower motor should shut off. If the temperaĆ ture rises above 600F (316C), adjust the hiĆ limit pot (See FIGURE 6) so the burner shuts off at 600F (316C). A clockwise rotation of the highĆlimit pot increases the temperature, counterĆclockwise decreases it.

NOTE: Repeat Low Limit Adjustment STEPS 1Ć3 to

verify new settings.

3. Adjust the Meter High Set so the display matches the pyrometer. A clockwise rotation

INCREASE

DECREASE

ZYTRON

SERIES 300

13 265

230

115

NO C NC

OUTPUT 1

Zytron Board

INCREASEDECREASE

INCREASE

HI LIMIT

1 2 3 4 5 6 7 8

230 115 NC C NO NO C

DECREASE

LOW LIMIT

United Electric Board

INCREASE

DECREASE LOW LIMITP2HI LIMIT

FIGURE 6

910

T/C

RED

478

NO C

OUTPUT 2

Lamp

Set Point

Coarse Manual

Meter

High Set

Flips Down

Band

Width

Set Fully

CCW

Panel

Cycle Time

Set Fully

Temperature Control Board

4-4

MT2136

TEMPERATURE CALIBRATION - ATHENA CONTROLLER

THE CONFIGURATION MENUS

1. Press and hold the actual temperature key for approximately 10 seconds. When the menu system has been accessed, the display toggles between and either or .

Setting the Default Display

The default display determines whether the controlĆ ler displays the actual or the setpoint temperature.

1. Use the arrow keys to select the desired disĆ play default.

NOTE: We recommend using the setpoint disĆ

play default.

2. Press the actual temperature key to enter the selected display default. The display will toggle between and a numerical value.

Setting the Control Hysteresis

The control hysteresis, or the burner cycle is used to prevent rapid cycling around the setpoint. The hysteresis is adjustable from 2F to 252 F (0C to 140C).

1. Use the arrow keys to select the desired conĆ trol hysteresis.

NOTE: We recommend using 5F initially.

2. Press the actual temperature key to enter the selected hysteresis value. The display will toggle between and a numerical value.

Setting the Display Offset

The display offset is used to provide a limited adĆ justment of the displayed temperature as a comĆ pensation for offsets between the actual temperaĆ ture and the temperature seen by the thermocouple. The display offset is adjustable from Ć126F to +126F (Ć70C to 70C).

1. Use the arrow keys to select the desired disĆ play offset.

Setting the Deviation Band Alarm

The deviation band alarm causes the display to flash when the actual temperature varies (in either direction) from the setpoint. The deviation band alarm is adjustable to off or values from 1F to 252F (1C to 740C).

1. Use the arrow keys to select the desired deviĆ ation band alarm.

2. Press the actual temperature key to enter the selected alarm value.

To exit the Configuration Menus

1. Push and hold the actual temperature key for approximately 3 seconds.

NOTE: The unit exits the configuration menus if the

controller is not touched for 1 minute at any time during the programming process.

SETTING THE DISPLAY UNITS

NOTE: On newer models, skip steps 1Ć3.

1. Disconnect the power from the control. ReĆ move all wires and the back of the control.

2. Locate the black jumper on the microcontroller board next to the thermocouple connection. Install the jumper on both pins.

3. Reconnect the power to the control.

4. Press and hold the actual temperature key for approximately 10 seconds until the display reads and flashes or . Press the up or down arrow key to toggle between F and C.

5. Press and hold the actual temperature key unĆ til the control exits the programming mode.

NOTE: DO NOT disconnect power and move the

jumper back to single pin until the control has returned to normal operation.

2. Press the actual temperature key to enter the selected offset value. The display will toggle between and a numerical value.

4-5

CALIBRATION AND ADJUSTMENT

LOW LIMIT ADJUSTMENT

1. Bring the oven to 200F (93C).

2. Turn both the blower and the heat switches to OFF. The blower should continue to run.

3. Monitor the digital temperature control display. The blower motors should shut off within the range of 170Ć135Fāāā(77Ć57C).

4. To adjust the temperature, turn the lowĆlimit potentiometer. A clockwise rotation increases the setting, counterĆclockwise decreases it. See FIGURE 7.

INCREASE

HIGH LIMIT ADJUSTMENT

NOTE: Refer to the wiring diagram located on the

oven or on page 3-25 of the Operation section. For additional assistance call the Blodgett Service department.

1. Remove the wires from the common and N.O. terminals. Touch the wires together to energize the heat circuit. This enables the oven to heat above the highest temperature allowed by the controller.

2. When the display reads 600F (316C), the burner blower motor should shut off. If the temĆ perature rises above 600F (316C), adjust the hiĆlimit pot (FIGURE 7) so the burner shuts off at 600F (316C). A clockwise rotation of the highĆlimit pot increases the temperature, counterĆclockwise decreases it.

910

T/C

RED

INCREASEDECREASE

INCREASE

HI LIMIT

1 2 3 4 5 6 7 8

230 115 NC C NO NO C

DECREASE

LOW LIMIT

United Electric Board

DECREASE LOW LIMITP2HI LIMIT

DECREASE

ZYTRON

SERIES 300

13 265

230

115

NO C NC

OUTPUT 1

Zytron Board

ACTUAL SETPOINT HEAT

Athena Temperature Controller

478

NO C

OUTPUT 2

FIGURE 7

4-6

MT2136

COMPUTER CONTROLLER CONFIGURATION

COMPUTER CONTROLS

INITIATING ACCESS MODE

The Cooking Computer provides a special Access Mode for setting and displaying certain computer special functions. To initiate the Access Mode place the control in the OFF state, (OFF is shown in the display when power is first applied to the control). Press the following sequence of keys to set the control to Access Mode: CLEAR 1 2 3 4 5 6 ENTER. The display reads ACCESS.

DISPLAY ACTION

DISPLAY ACTION TAKEN

TAKEN

F/CMODE? Press

POS OFFSET? Press

NEG OFFSET? Press

MAXĆT ENTRY? Press

PROG

T  F(C)

ENTER

PROG

0(0) Press

ENTER

PROG

0(0) Press

ENTER

PROG

600(315) Press or change then

ENTER

CONFIGURATION

When the controller is in the ACCESS" mode, press the following buttons: CLEAR 1 1 1 ENTER. With the exception of the positive and negative offĆ sets, to be addressed later, all display data should correspond to the entries in the chart below. If the data does not match the chart, it should be changed accordingly. When the correct data is disĆ played press the PROG/ENTER key, the display will cycle on to the next screen. If a step is missed, press the CLEAR button to backup.

Press again or hit any number and

press again.

PROG

ENTER

PROG

ENTER

PROG

ENTER

PROG

ENTER

it will change.

MAXĆT LIMIT? Press

READY BAND? Press

MINĆHT ON? Press

DISPLAY INTEG? Press

TĆCTRL INTEG? Press

PROG

625(330) Press

ENTER

PROG

10 Press

ENTER

PROG

60 Press

ENTER

PROG

30 Press

ENTER

PROG

10 Press

ENTER

NOTE: Press the CLEAR key to back up one paĆ

rameter.

TABLE 4

PROG

ENTER

PROG

ENTER

PROG

ENTER

PROG

ENTER

PROG

ENTER

4-7

Boost Option - (versions 2.00 or 3.00)

When the controller is in the ACCESS" mode, press the following buttons: CLEAR 2 1 2 ENTER to enter the boost option.

CALIBRATION AND ADJUSTMENT

DISPLAY

ACTION

DISPLAY ACTION TAKEN

TAKEN

BOOST / MODEĆ? (Flash alternately)

Press

PROG

ENTER

OPTĆ1 or OPTĆ2

Select OPTĆ1 to turn off boost mode.

OPTĆ1 Press

PROG

ENTER

DONE SAVE EXIT

EXITING THE ACCESS MODE

After pressing PROG/ENTER the last time, the disĆ play will show EXIT" then beep and return to the ACCESS" mode. Pressing and holding the ON/ OFF key will turn the oven on. A new time and temĆ perature must be entered upon exiting the ACĆ CESS" mode since the oven will automatically default to 0. The oven will not fire until both time and temperature are entered.

TABLE 5

Press any numeric key to toggle between OPTĆ1 and OPTĆ2

Press

PROG

ENTER

Firmware Model Version Display

Password: CLEAR 1 2 3 ENTER

MODEL Ć Computer Model Number - 6028 (Blodgett Conveyor Oven With Speed Control)

SWĆVER Ć Firmware version number. VĆxxyy xx = major version, yy = minor version

DATEĆ? ĆFirmware release date

CHKSUM Ć ROM checksum stored in PROM. xxxx Ć Value is display in hexadecimal format.

4-8

MT2136

TEMPERATURE CALIBRATION

TO ENTER THE CALIBRATION MODE

1. Press the ON/OFF key until OFF is displayed.

2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the access mode. The display reads ACCESS.

3. Press CLEAR ACT_TEMP ACT_TEMP ACT_TEMP ENTER to access the Temperature Calibration mode.

4. Disconnect the white wire from the D.C. motor. Secure so the wire will not ground against any part of the oven. This will disable the conveyor.

NOTE: Disregard the controller display. The only

numbers of concern are the pyrometer reading and the temperature set point.

TO CALIBRATE THE OVEN TEMPERATURE

During operation, the temperature control is based on the measured temperature and the temperaĆ ture 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. If the temperature measured in the center of the oven is above the oven setpoint a negative offset is needed.

NOTE: In the calibration mode the display gives

the current measured temperature only.

To view the current temperature setpoint:

1. Press the SET_TEMP, key.

To change the temperature setpoint :

1. Press PROG/ENTER SET_TEMP.

2. Enter the desired setpoint.

3. Press the PROG/ENTER key.

To program the temperature offset:

To change the temperature calibration an offset, positive or negative, must be programmed.

1. Press PROG/ENTER followed by ACT_TEMP. The display flashes either POS * OFFSET or

NEG * OFFSET

NOTE: POS OFFSET is displayed if a value has

been programmed in for a positive offĆ set. NEG OFFSET is displayed if a valĆ ue has been programmed for a negaĆ tive offset. The only time both will be displayed is if a value of 0 has been enĆ tered for both.

2. Enter a value for the desired offset. The display flashes DISPLAY * INTEG?.

3. Press the PROG/ENTER key. The default value of 30 will be displayed.

4. Press the PROG/ENTER key. The display will flash TĆCTRL * INTEG?.

5. Press the PROG/ENTER key. The default value of 10 will be displayed.

6. Press the PROG/ENTER key.

The control will now resume using the new paramĆ eters.

Verify the temperature calibration once the unit has cycled for 5 minutes with the new settings. Repeat calibration using a new offset value if necessary.

TO EXIT THE CALIBRATION MODE

1. Press the CLEAR key twice.

2. The display flashes REBOOT then displays the set time and temperature. You must reĆenter a temperature for the oven to start heating again.

A.) Press PROG/ENTER SET_TEMP

B.) Enter the desired temperature.

C.) Press the PROG/ENTER key. The heat

light turns on and the burner begins to cycle at set point.

4-9

BELT SPEED CALIBRATION

CLOSED LOOP SYSTEM

CALIBRATION AND ADJUSTMENT

To enter the calibration mode:

1. Press the ON/OFF key until OFF is displayed.

2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the Access mode. The display reads ACCESS.

3. Press CLEAR TIME TIME TIME ENTER to acĆ cess the Belt Speed Calibration mode. The disĆ play flashes INIT.

Belt speed calibration:

1. OVEN LENGTH - Set the length of the conveyĆ or belt to 36.

2. MOTOR RATIO - Set the motor gear ratio to

600.

3. SHAFT TEETH - Set the shaft teeth number to15

4. MOTOR TEETH - Set the motor teeth number to 12.

5. BELT RADIUS - Set the belt radius to 8,712.

NOTE: The values given are estimates. If you

reenter the calibration mode after setĆ ting the belt speed, the belt radius may differ from the table.

6. The display gives a four digit value followed by the letter K. Press ENTER twice to verify the belt time.

Belt speed verification:

1. ENTER TEST TIME - Enter a test time to verify the belt speed. The default setting is 7 minutes.

2. WAIT - 1 second delay before the belt moves.

4. ENTER TEST TIME - If the actual measured time is not within 5 seconds of the test time, reĆ peat the belt verification test to obtain better accuracy. If the actual measured time is acĆ ceptable, press the CLEAR key to continue the belt speed calibration.

5. MAX/MIN CALC TIME - The control sets the fastest and slowest cook time the user can proĆ gram. This requires a 1 minute delay in the calĆ ibration process.

NOTE: If the control cannot read the shaft enĆ

coder the display reads ERROR then ABORT before exiting belt calibration. Verify the connection of the encoder Restart the belt speed calibration.

6. The display flashes MIN SET TIME? Press the PROG/ENTER key to display the calculated minimum set time. Press the PROG/ENTER key to accept this value or enter a new time with a value higher than the default. Press PROG/ENTER again to accept.

7. The display flashes MAX SET TIME? Press the PROG/ENTER key to display the calculated maximum set time. Press the PROG/ENTER key to accept this value or enter a new time with a value lower than the default. Press PROG/ENTER again to accept.

8. The display reads DONE.

To save the new belt speed:

1. Press ENTER to save the belt speed calibraĆ tion program in the control's memory.

3. ENTER ACTUAL TIME - Place an object on the belt. Note the time from entrance to exit. Enter the actual measured time.

4-10

MT2136

OPEN LOOP SYSTEM - SINGLE BELT

To enter the calibration mode:

1. Press the ON/OFF key until OFF is displayed.

2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the Access mode. The display reads ACCESS.

3. Press CLEAR TIME TIME TIME ENTER to acĆ cess the Belt Speed Calibration mode. The disĆ play flashes INIT.

Belt speed calibration:

1. The display reads BELT SIZE-?. Enter 36 for the length of the conveyor belt. Press the PROG/ENTER key.

2. The display reads STEP-1. The controller is in Step 1 of the calibration procedure: maximum belt speed. The motor control is automatically set to its maximum output. Place an object on the belt and note the time from entrance to exit.

NOTE: Be certain to measure either the leadĆ

ing edge in and out or the trailing edge in and out. Do not use the leading edge in and the trailing edge out.

A.) The display reads STEP-1TIME-?. Enter

the time measured in STEP-1. Min: 0 Max: 59:59 (min:sec). Press the PROG/ ENTER key.

B.) The display reads STEP-1DIST-?. Enter

36 for the belt length. Press the PROG/ENĆ TER key.

3. The display reads STEP-2. The controller is in Step 2 of the calibration procedure: minimum belt speed. The motor control is automatically set to its minimum output.

The belt will travel very slowly during this part of the calibration procedure. To minimize the time spent on STEP-2, measure off 10" on the conveyor support. Place an object on the belt and note the travel time for the 10" measured distance.

A.) The display reads STEP-2 TIME-?. Enter

the measured travel time for STEP-2. Min: 0 Max: 59:59 (min:sec). Press the PROG/ ENTER key.

B.) The display reads STEP-2 DIST-?. Enter

10". Press the PROG/ENTER key.

4. The display reads MIN-TM ENTRY? (the fastĆ est belt speed). Limits of this value are deterĆ mined by the Step-1 and Step-2 calibration values. Use 200 (2 min). Press the PROG/ENĆ TER key.

5. The display reads MAX-TM ENTRY? (slowest belt speed). Limits of this value are determined by the Step 1 and Step 2 calibration values. Use 1600 (16 min). Press the PROG/ENTER key.

6. The display flashes DONE and SAVE. Press the PROG/ENTER key to permanently store the calibration values in nonĆvolatile memory (NOVRAM).

NOTE: During these adjustments, pressing the

clear button will abort all entries and reĆ quire reprogramming of belt time mode. When exiting the Belt Speed Calibration Mode, enter a time. Otherwise the time deĆ faults to zero, the oven will not heat, and the belt will not move.

4-11

OPEN LOOP SYSTEM - TWIN BELT

CALIBRATION AND ADJUSTMENT

To enter the calibration mode:

1. Press the ON/OFF key until OFF is displayed.

2. Press CLEAR 1 2 3 4 5 6 PROG/ENTER. The display flashes ACCES S.

3. Press CLEAR, FRONT BELT, FRONT BELT, FRONT BELT, PROG/ENTER to enter the AcĆ cess mode. The display reads FRONT.

4. Press FRONT BELT to toggle between front and rear belt.

5. The display reads FRONT-INIT-F.

Belt speed calibration:

1. The display reads BELT SIZE-?. Enter 36 for the length of the conveyor belt. Press the PROG/ENTER key.

NOTE: Be certain to measure either the leadĆ

ing edge in and out or the trailing edge in and out. Do not use the leading edge in and the trailing edge out.

A.) The display reads STEP-1TIME-?. Enter

the time measured in STEP-1. Min: 0 Max: 59:59 (min:sec). Press the PROG/ ENTER key.

B.) The display reads STEP-1DIST-?. Enter

36 for the belt length. Press the PROG/ENĆ TER key.

3. The display reads STEP-2. The controller is in Step 2 of the calibration procedure: minimum belt speed. The motor control is automatically set to its minimum output.

A.) The display reads STEP-2 TIME-?. Enter

the measured travel time for STEP-2. Min: 0 Max: 59:59 (min:sec). Press the PROG/ ENTER key.

B.) The display reads STEP-2 DIST-?. Enter

10". Press the PROG/ENTER key.

4. The display reads MIN-TM ENTRY? (the fastĆ est belt speed). Limits of this value are deterĆ mined by the Step-1 and Step-2 calibration values. Use 200 (2 min). Press the PROG/ENĆ TER key.

5. The display reads MAX-TM ENTRY? (slowest belt speed). Limits of this value are determined by the Step 1 and Step 2 calibration values. Use 1600 (16 min). Press the PROG/ENTER key.

6. The display flashes DONE and SAVE.

NOTE: During these adjustments, pressing the

clear button will abort all entries and reĆ quire reprogramming of belt time mode. When exiting the Belt Speed Calibration Mode, enter a time. Otherwise the time deĆ faults to zero and the oven will not heat, and the belt will not move.

4-12

MT2136

MOTOR CONTROL BOARD ADJUSTMENT

High/low speed motor control board adjustĆ ment for 180 and 130 volt DC motors

NOTE: The motor control board is located on the

slide out control panel.

High Speed Motor Adjustment:

For closed loop systems follow Belt Speed VerificaĆ tion through STEP 5 (see page 4-10). For open loop systems follow Belt Speed Calibration through STEP 2 (see page 4-11 or 4-12).

1. With the motor connected (make no open cirĆ cuit voltage readings) measure the voltage at the motor leads (A1 & A2 in FIGURE 8) on the DC control board. If the voltage is not within 3 VDC of the specified voltage continue with step 2.

2. Turn the MAX trim pot counterĆclockwise to lower and clockwise to raise the voltage until it is within 3VDC of the specified voltage.

NOTE: For computerized closed loop sysĆ

tems this adjustment must be made quickly.

Low Speed Motor Adjustment:

For closed loop systems the computer automatiĆ cally proceeds to low speed. For open loop sysĆ tems continue Belt Speed Calibration through STEP 3 (see page 4-11 or 4-12).

1. With the motor connected (make no open cirĆ cuit voltage readings) measure the voltage at the motor leads on the DC control board (A1 & A2 in FIGURE 8). If the voltage is not 26VDC +/Ć 1 VDC, continue with step 2.

2. Turn the MIN SPEED pot clockwise to lower the voltage and counterĆclockwise to raise the voltĆ age.

NOTE: If any voltage adjustments were made hit

the CLEAR key to abort the calibration mode. Reenter the calibration mode to verify that voltage is locked in.

COMPUTERIZED OVENS

130 Volt System 180 Volt System

Model Low High Low High

MT2136 20 130 26 180

NONĆCOMPUTERIZED OVENS

MT2136 20 130 26 180

TABLE 6

4-13

CALIBRATION AND ADJUSTMENT

Acceleration Adjustment

Yellow or Violet (pin 12)

Orange or Gray (pin 10)

Blue (pin 8)

Violet

Gray

Blue

Speed Pot

NOTE: Colors may vary

between early ovens.

Line Fuse

Minimum Speed

Maximum Speed

Socket J1

TB1

ACC MAX MIN

Test

Points

L N A1 A2

TP1

TP2

Torque (current) limiting adjustment (DO NOT ADJUST)

Switches 2,4,5,6,7

TORQ

DIP Switch on

early models only

REG

Regulation Adjustment

Armature Fuse

Line Hot (VAC)

Line Neutral (VAC)

PM Motor Armature

Barrier Terminal Block TB1

Power Line and Motor Ground

REMOVE RED PLUG FROM TOP OF DC MOTOR PRIOR TO OPERATING!

Warning: Circuit components are not at ground potential! Use only a nonĆmetallic or insulated adjustment

tool. Shock hazards may occur with conducting tools!

FIGURE 8

4-14

MT2136

RERATING THE APPLIANCE

Due to the lack of oxygen at higher elevations, the unit may need to be rerated. (The orifice size may need to be adjusted to accommodate different air pressures at higher elevations.) If not rerated, inĆ complete combustion may occur releasing AldeĆ hydes and CO or Carbon Monoxide. Any of these

are unacceptable and may be hazardous to the health of the operator.

To choose the correct orifice for different altitudes several factors must be known:

1. Altitude

2. BTUs per burner

3. Manifold pressure

4. Correct orifice size at sea level

5. BTU value of the gas

The following are generally accepted heating values:

A.) Natural Gas - 1000 BTU/Cu Ft

B.) Propane - 2550 BTU/Cu Ft

C.) Butane - 3000 BTU/Cu Ft

6. Specific gravity

The following are generally accepted values (Air = 1.0):

A.) Natural Gas - 0.63

B.) Propane - 1.50

C.) Butane - 2.00

NOTE: For other gases contact your local gas supĆ

plier for values.

Use the following formulas to calculate the correct orifice:

Firing rate

# of burners

BTU per burner

Heating value of Gas

CuFt/Hr

Specific Gravity Multiplier

4. Use TABLE FĆ1 from the National Fuel Gas Code Handbook to determine the proper oriĆ fice size at sea level.

NOTE: The sea level orifice size is needed to

determine the proper orifice at any elevation.

5. Use TABLE FĆ4 from the National Fuel Gas Code Handbook to determine the correct oriĆ fice for the applicable elevation.

6. Use TABLE FĆ3 from the National Fuel Gas Code Handbook to determine the specific gravity multiplier.

EXAMPLE

Known factors:

1. Altitude = 5000 ft.

2. BTUs per appliance = 55,000

3. Number of burners = 2

4. BTU value of the gas = 900

5. Specific gravity = .50

Calculations:

=ąBTU per burner

=ąCuFt/hr

=ąEquiv. CuFt/h

55,000

27,500

900

30.55

1.10

Using the tables in the National Fuel Gas Code Handbook we can determine that:

1. Correct orifice size at sea level = #40

2. Correct orifice size at 5000 ft = #42

4-15

=ą27,500 BTU per burner

=ą30.55 CuFt/hr

=ą27.77 Equiv. CuFt/hr

CHECKING THE FIRING RATE

CALIBRATION AND ADJUSTMENT

Method #1

1. Turn off all other appliances on the line. Turn on the appliance to be measured.

2. Using either the 1/2 cu. ft. or the 2 cu. ft. dials located on the gas meter, note the time it takes the indicator to complete one revolution. See FIGURE 9.

3. Use the following formula to determine the firĆ ing rate of the meter.

3600 x size of test dial x 1000

=ĂBTU/burner

# of seconds per revolution

Example:

A.) 3600 x 2 = 7200

7200

B.)

=Ă120 Cu. Ft./Hr

C.) To convert to BTU/Hr, multiply by one of the

following generally accepted heating valĆ ues:

Natural Gas - 1000 x 120 = 120,000 BTU Propane - 2550 x 120 = 306,000 BTU Butane - 3000 x 120 = 360,000 BTU

NOTE: You may also use TABLE XII from the

National Fuel Gas Code Handbook to aid in determining the firing rate of the appliance. This table eliminates the use of the formulas above.

Locate the time observed in STEP 2. Move across the table to either the 1/2 cu. ft. or the 2 cu. ft. column to find the gas input to the burner.

FOOT

HALF

100 THOUSAND 10 THOUSAND 1 THOUSAND1 MILLION

TWO

FEET

CUBIC FEET

TYPICAL DOMESTIC GAS METER INDEX

FIGURE 9

Method #2

You may also determine the firing rate by sizing the main burner orifice and measuring manifold gas pressure. Either way is accurate, however method #1 is faster.

4-16

MT2136

This page intentionally left blank.

4-17

CHAPTER 5

TROUBLESHOOTING

MT2136

DC DRIVE SYSTEM

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #1 - Belt does not move (standard controls)

 Conveyor switch is turned off.

 Armature fuse on Bodine board is blown.

 Turn switch to on.

 Ohm this fuse out to determine if blown. If necesĆ

sary, replace with 250 milliamp fuse. Determine the amp draw of the motor.

 Line fuse on Bodine board is blown.

 DC motor is leaking oil.

 Motor ohms out higher then 162W.

 Motor ohms out lower then 100W.

 Brushes worn.

 Control fuses blown.

 Replace with 5 amp fuse.

 Replace motor.

 Replace brushes.

 Check wiring going from the front control panel

to the burner compartment for damage.

 Potentiometer does not ohm out correctly, 10kW.

 Replace potentiometer.

Symptom #2 - Belt does not move (computer controls)

 Oven in OFF mode.

 Loose computer controller cord connection.

 Time not programmed into computer.

 Turn to ON position.

 Adjust and retighten cables and set screws.

 Program in a cook time. See Operation Section

(page 3-4).

 Emergency stop switch on OFF.

 Pull switch out to ON.

 Control circuit breaker tripped.

 Belt hooked on something in oven.

 5 amp line fuse blown.

 200 milliamp armature fuse blown.

 Hall Effect Pickup not connected. (Closed loop

systems only)

 Motor brushes worn out.

 Defective conveyor drive motor.

 Defective conveyor drive motor controller.

 Wire from pickup open or misplaced.

 DAC defective.

 9 or 25 pin cable defective.

 Belt speed relay defective.

 Reset breaker.

 Turn oven OFF, unhook and repair problem.

 Replace fuse. Determine amp draw.

 Verify the unit is set for a single pulse pickup. If

not, reset for a single pulse pickup. If yes reattach the pickup.

 Replace brushes.

 Replace conveyor drive motor.

 Replace conveyor drive motor controller.

 Repair or replace wire.

 Replace computer.

 Replace cables.

 Replace relay.

5-1

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #3 - Computer error code MOTOR Ć SPEED Ć ERROR

TROUBLESHOOTING

 Belt speed needs calibration.

 Voltage from Bodine controller to DAC not presĆ

ent. The DAC (Digital Analog Control) is a nonĆreĆ pairable component of the computer. There should be approximately 20 VDC between the red and green wires on the 3 pin connection of the DC drive board.

 DAC voltage is present but not regulated beĆ

tween 4.7 and .47 VDC when different times are programmed into the cooking computer. MeaĆ sure the voltage between the green and blue wires of the 3 pin connection.

 See Calibration and Adjustments.

 Replace the drive motor controller.

 Replace the computer.

5-2

MT2136

CONVECTION SYSTEM

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #1 - Blower motor(s) not running

 Blower switch off.

 No power to the oven.

 Motor fuse blown.

 Faulty start capacitor.

 Motor burned out.

 Thermal overload tripped.

 No voltage at the motor contactor coil.

 Faulty motor contactor.

Symptom #2 - Blower motor(s) do not shut off

 Faulty motor contactor.

 Faulty thermocouple on Hi/Lo board.

 Turn switch to on position.

 Verify power to the oven. If there is no power deĆ

termine cause.

 Replace fuse. Determine the amp draw.

 Replace capacitor.

 Check draw (3 amps or greater).

 Determine if the cooling blower (or fans) are operĆ

ating. If not, verify voltage to the cooling blower. If voltage is present, replace the cooling blower motor. If voltage is not present, verify voltage through the thermal switch. If no voltage is presĆ ent, replace the thermal switch.

 Check for blown fuse or bad blower switch.

 Replace motor contactor.

 Replace contactor.

 Refer to the chart on page 6-5 of the Technical

Appendix. If the readings do not match replace the thermocouple.

 Faulty Hi/Lo board.

 Hi/Lo board is not adjusted properly.

Symptom #3 - Blower motor running backward

 Motor off by thermal overload (other fans forcing

blower to spin).

 Faulty capacitor.

 Determine if 115 VAC is coming out of #7 with the

adjustable potentiometer turned completely counterĆclockwise. If voltage is still present, reĆ place the board.

 Check and readjust Hi/Lo board. Refer to page

4-4 of Calibration and Adjustment.

 Determine if the cooling blower (or fans) are operĆ

 Replace capacitor.

5-3

HEATING SYSTEM

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #1 - Burner will not fire (standard controls)

TROUBLESHOOTING

 Oven in off mode.

 No power to the oven.

 Fuse blown on the control panel.

 Determine if the controller setpoint is above actuĆ

al.

 Intermittent Ignition Device (IID) system locked

out.

 Air pressure switch may be open.

 Blower motor(s) not running.

 High limit in front panel open.

 Hi limit on Hi/Lo limit board has been hit.

 Verify that the pilot goes out when unit is shut

down.

 Verify that combustion motor is spinning and that

the centrifugal switch is closed.

 Turn the oven on.

 Determine if the circuit breaker is tripped.

 Replace the fuse.

 If the setpoint is not above the actual, reset acĆ

cordingly.

 Reference Technical Appendix (page 6-1

through 6-3).

 Check convection blower for proper operation.

 Verify voltage to motor. If voltage is present, reĆ

place the motor or start capacitor.

 Verify that the temperature in the front panel is

lower than 140F (60C).

 Verify that the oven temperature exceeded 600F

(316C).

 If pilot does not extinguish, replace the pilot valve.

 If the motor is not spinning, check the transformĆ

er and time delay relay in the control box on the top of the combustion motor. If one or both are bad, replace. If the motor is spinning and there are not 24 volts to the ignition control box, the centrifugal switch is bad. Replace the combusĆ tion motor.

 Temperature not programmed into cooking comĆ

puter.

 Time not programmed into cooking computer.

 Heat relay defective (computer controlled

ovens).

 Gas pressure to oven too high.

 Gas pressure to oven too low.

 Program cook temperature into the computer.

 Programm cook time into the computer.

 Replace relay.

 Lower to specified gas pressure.

 Raise to specified gas pressure.

5-4

MT2136

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #1 - Burner will not fire (computer controls)

 Oven in OFF mode.

 Emergency stop switch on OFF.

 Control circuit breaker tripped.

 Combustion motor not running.

 Main Temperature Controller not set above ambiĆ

ent temperature.

 Manual gas valve closed.

 Intermittent Ignition Device (IID) system locked

out.

 Air pressure switch may be open.

 Blower motor(s) not running.

 High Limit control tripped.

 Turn to ON position.

 Pull switch out to ON.

 Reset breaker.

 Check transformer for primary and secondary

voltage.

 Check main control and burner valve relays to

see if closed.

 Check relay in combustion burner box. If bad reĆ

place relay.

 Set to desired temperature.

 Open valve.

 Reference Technical Appendix (page 6-1

through 6-3).

 Check convection blower for proper operation.

 Verify voltage to motor. If voltage is present, reĆ

place the motor or start capacitor.

 Verify that 625F (330C) high limit is proĆ

grammed into the controller. If so reset the high limit. Set the computer to 500F (260C). Use a pyrometer to verify the oven temperature. If the oven climbs significantly above the setpoint, use the chart in the Technical Appendix (page 6-4) to check the probe. If the probe is alright the comĆ puter may need replacement.

 Thermal switch in control compartment tripped.

 Excessive intake air temperature.

 If pilot fails to go out when the unit is shut down,

the solenoid valve is bad.

 Check hood system.

 Replace valve.

5-5

TROUBLESHOOTING

COMPUTER CONTROL SYSTEM

POSSIBLE CAUSE(S) SUGGESTED REMEDY

Symptom #1 - Computer controller displays: PROBE Ć OPEN Ć PROBE Ć SHORT and

alarm buzzer sounds

 Internal problem with computer controller.

 Verify display integ. in the 2nd level programĆ

ming. If the controller has been programmed the computer may need to be replaced.

 Loose connections at computer controller.

 Shorted or open RTD probe.

 Tighten connections.

 Use the chart in the Technical Appendix (page

6-4) to determine if probe is bad. Replace if necĆ essary.

Symptom #2 - Computer controller displays: ERROR Ć HIGH Ć TEMP Ć LIMIT

 Actual temperature exceeds programmed limit

 Faulty burner valve relay. Replace relay.

value. Default 605F (319C).

 Internal problem with computer controller.

 Verify display integ. in the 2nd level programĆ

ming. If the controller has been programmed the computer may need to be replaced.

Symptom #3 - Oven will not reach desired temperature

 Gas pressure to oven is too low.

 Top air plates missing or not adjustable.

 Faulty RTD probe.

 Contact local gas representatives.

 Install/adjust air plates.

 Use the chart in the Technical Appendix (page

6-4) to determine if probe is bad. Replace if necĆ essary.

 Blower motor(s) running backward.

 Controller out of calibration.

 Excessive food/debris accumulation blocking

the airflow.

 Verify voltage to motor. If voltage is present, reĆ

place the motor or start capacitor.

 Recalibrate the controller. See Calibration secĆ

tion (page 4-9).

 The inside of the oven should be cleaned to reĆ

move any materials that could have dropped off the conveyor belt and possibly blocked some of the air flow holes. This would include the removal of the conveyor belt, conveyor belt supports, and the nozzles. The oven interior and all parts reĆ moved should then be cleaned with an appropriĆ ate oven cleaner safe for aluminum.

5-6

MT2136

Symptom #4 - Burner operates sporadically

 Air pressure switch may be open.

 Thermal switch tripped.

 Faulty RTD probe.

 Excessive food/debris accumulation blocking

the airflow.

 Check convection blower (or 4 convection fans)

for proper operation.

 Determine the ambient temperature in the conĆ

trol compartment. If above 140F (60C) check the cooling fan operation.

 Use the chart in the Technical Appendix (page

6-4) to determine if probe is bad. Replace if necĆ essary.

 The inside of the oven should be cleaned to reĆ

5-7

CHAPTER 6

TECHNICAL APPENDIX

MT2136

INTERMITTENT IGNITION SYSTEM

PRINCIPLES OF OPERATION

Pilot flame sensing is a very important aspect of the ignition controls operation. Three zones are needĆ ed to give the proper airĆgas ratio to produce a blue pilot flame.

Zone 1 - an inner cone that will not burn because excess fuel is present.

Zone 2 - around the inner, fuel rich cone is a blue envelope. This zone contains a mixture of vapor from the fuel rich inner cone and the secondary or surrounding air. This is where combustion occurs, and is the area of highest importance for proper flame sensor location.

Zone 3 - Outside the blue envelope is third zone that contains an excessive quantity of air.

FLAME RECTIFICATION

To identify a current conducted by the flame, we use flame rectification. Place two probes in Zone 2 of the pilot flame. When the surface area of one probe is larger than the other, current tends to flow more in one direction. DC current flows in only one direction, as opposed to AC current, which alterĆ nates its direction. The current is rectified from AC to DC by increasing the surface area of one probe and decreasing the surface area of the other.

In the IID system the probes exposed to the pilot flame are the Flame Sensor and the Pilot Burner Hood. Since the surface area of the pilot hood is larger than the flame sensor, the current rectificaĆ tion process takes place. Current is conducted from terminal 4 at the control through the flame sensor cable to the flame sensor. As the current is conducted through the flame to the pilot hood, it is rectified from AC to DC because of the difference in surface area. The pilot hood is grounded back to the control, thereby completing the circuit.

Flame Sensing Circuit Current

For the ignition control to function properly, a miniĆ mum amount of current must flow through the flame sensing circuit.

As the pilot flame is established and current begins to flow in the flame sensing circuit, the current enĆ ergizes a relay. A minimum amount of current is reĆ quired to pullĆin the relay. When the relay pulls in, one set of contacts opens which shuts off the high energy spark. Another set of contacts closes, puttĆ ing 24 volts on terminal 3 which opens the main gas valve.

Current vs. Voltage

In normal operation an AC voltage will be present from terminal 4 to ground and a current will be present in the flame sensing circuit.

Current

AC Voltage

Positive Probe

FIGURE 1

DC Current

Current

AC Voltage

Transformer

Flame

Negative

Probe

Ground

Even though an AC voltage is present, flame rectifiĆ cation occurs and a DC current flows in the sensing circuit.

For service checkout purposes, measuring these voltages and currents can provide useful informaĆ tion regarding the integrity of the ignition control.

Measuring the current flow rather than voltage is the preferred procedure. Due to the internal circuitĆ ry of the ignition control and varying input impedĆ ance of voltmeters, the measured voltage will vary depending on type and model of voltmeter being used. However, measuring the current provides a more precise evaluation of the ignition control and flame sensing circuit.

A proper reading not only indicates a functional control, but also verifies all components of the cirĆ cuit such as flame sensor, cable and ground.

6-1

TECHNICAL APPENDIX

SERVICE PROCEDURES

Service the IID system as follows:

1. Make certain the thermostat contacts are open.

2. Check for proper supply voltage at primary and secondary of system transformer.

3. Close thermostat contacts and observe sysĆ tem.

4. Determine which system condition exists:

A.) No spark, system does not function

B.) Spark present but pilot will not light

C.) Pilot lights but main valve will not open

5. Follow the appropriate service checkout proĆ cedure to troubleshoot and repair the system.

6. Observe the system through several complete operating cycles.

VOLTAGE AND CURRENT MEASUREMENTS

When servicing the electronic ignition control there are several times when voltages and currents must be measured or observed.

NOTE: All voltages measured will be AC voltage

and all current measured will be DC curĆ rent.

Terminal Terminal Use

1 Pilot valve connection between terĆ

minal #1 and ground

2 Wire from thermostat

3 Main valve connection between terĆ

minal #3 and ground

4 Flame sensor

TABLE 1

To Measure AC Voltages:

1. Set the selector switch on the voltmeter to the AC voltage position.

2. Connect the meter leads in parallel with the voltage to be measured.

To Measure DC Flame Sensing Current:

1. Turn off the power supply to the ignition conĆ trol.

2. Disconnect the flame sensor cable from termiĆ nal #4 on Johnson units or terminal #15 on Landis & Gyr units.

3. Set the selector switch on the meter to microĆ amp scale. Connect the positive (red) lead to terminal #4 and the negative (black) lead to the sensor cable.

4. Disconnect the main valve lead from terminal #3. This will prevent the main burner from ignitĆ ing. A proper measurement of flame sensing current is taken with the pilot light only.

5. Turn the power back on and close the thermoĆ stat contacts. Read the current at the meter.

NOTE: The minimum current required for the

Johnson G770 is 0.15DCmA. The miniĆ mum current required for the Landis & Gyr is 2.0DCmA. (This unit is polarity specific.)

6. Turn the power off to disconnect the meter and reconnect terminal #3 and #4.

To Measure DC Flame Sensing Current Using the Johnson Y99AUĆ3 Signal Transducer:

1. Set the function selector switch to the DC voltĆ age position.

2. Turn off the supply voltage to the control.

3. Disconnect the flame sensor cable from termiĆ nal #4 on the ignition control.

4. Connect the male 1/4" spade connector (-) to the flame sensor cable. Connect the female 1/4" spade connector (+) to terminal #4.

5. Disconnect the main valve lead from terminal #3 on the ignition control.

6. Turn the supply voltage on and close the therĆ mostat contacts to cycle the system.

7. When the pilot lights, read the current on the meter display.

NOTE: The conversion factor is 1DC volt - 1

DC microamp.

3. Read the voltage at the meter.

6-2

MT2136

REPAIRING THE ELECTRONIC IGNITION SYSTEM

Flame Sensing Current Maintenance:

The flame sensor is made of carbon steel and subĆ ject to contamination and oxidation buildup. Any buildup on the sensor can add enough resistance to drop the signal below the required minimum. Carbon and oxidation can also build up on the pilot hood. The pilot hood is part of the circuit and must be kept as clean as the flame sensor.

1. Clean the flame sensor with steel wool or an emery cloth.

2. Clean the pilot hood with a small wire brush to remove any carbon or oxidation buildup.

Flame Sensor Replacement:

If the ceramic portion of the flame sensor is broken or if the contamination is extensive, the flame senĆ sor may have to be replaced.

CAUTION!

Shut off all gas to the appliance by closing the shutoff valve in the supply line to that appliance. Disconnect the power supply to prevent electrical shock or possible damage to the equipment.

1. Disconnect the sensing probe cable from the old sensing probe.

2. Remove the old sensing probe from the pilot burner.

3. Check the length of dimension B to be sure the correct replacement probe is being used. See FIGURE 2.

4. Compare the sensing probe rod lengths, diĆ mension A. If required, trim the length of the Y75 rod being installed to the same length as the sensing rod being replaced.

5. Install the Y75 sensing probe into the pilot burner. Reconnect the sensing probe cable. The connections to the sensing probe and control terminal must be secure.

6. Restore the power and the gas supply to the appliance.

7. IMPORTANT: Using a microammeter, check the signal passing through the sensing probe.

8. If the microamp signal is marginal, trim the flame sensing probe in increments of 1/8". Be sure that there is still proper flame impingeĆ ment on the flame sensing probe.

Flame must surround sensing probe tip for approximately 1/2".

9. Observe at least three complete operating cycles to see that all components are functionĆ ing correctly.

Ground Connection

Another important requirement for proper operaĆ tion is the existence of a good electrical ground beĆ tween the pilot assembly and the ignition control. This ground provides the path for sensing current to return to the control, thereby completing the sensing circuit.

In most systems we assume the pilot burner is grounded back to the control through the pilot tubĆ ing and gas valve. The gas valve would be grounded to the ignition control when the control is mounted on the valve. Controls that are not mounted to a gas valve require a separate groundĆ ing wire connecting the control to the pilot assemĆ bly.

In some instances this ground can become weak and cause a low sensing current signal. To assure that a proper ground exists between the control and pilot, a wire can be installed from one of the ground terminals to the pilot bracket. This will asĆ sure a strong ground and maintain a proper sensĆ ing current signal.

FIGURE 2

Using a 1/4" female spade connector, connect one end of the new wire to the ground strip on the igniĆ tion control. Attach the other end of the wire to a bolt or screw on the pilot burner bracket. Be sure to use a wire with a high temperature rated insulaĆ tion.

6-3

TECHNICAL APPENDIX

COOKING COMPUTER - TEMPERATURE VS RESISTANCE

T/F Res/Ohms T/F Res/Ohms T/F Res/Ohms T/F Res/Ohms

70 541.12 230 711.43 390 877.15 550 1038.293

75 546.51 235 716.68 395 882.26 555 1043.255

80 551.9 240 721.92 400 887.36 560 1048.212

85 557.28 245 727.16 405 892.46 565 1053.165

90 562.66 250 732.4 410 897.55 570 1058.113

95 568.04 255 737.63 415 902.63 575 1063.057

100 573.4 260 742.85 420 907.72 580 1067.997

105 578.77 265 748.05 425 912.8 585 1072.931

110 584.13 270 753.29 430 917.87 590 1077.862

115 589.48 275 758.5 435 922.94 600 1087.709

120 594.84 280 763.71 440 928.002 605 1092.626

125 600.18 285 768.91 445 933.062 610 1097.539

130 605.53 290 774.11 450 938.118 615 1102.447

135 610.86 295 779.31 455 943.17 620 1107.35

140 616.2 300 784.5 460 948.216 625 1112.249

145 621.52 305 789.68 465 953.259 630 1117.1

150 626.85 310 794.87 470 958.296 635 1122

155 632.17 315 800.04 475 963.33 640 1126.9

160 637.48 320 805.21 480 968.359 645 1131.8

165 642.8 325 810.38 485 973.383 650 1136.7

170 648.1 330 815.54 490 978.403 655 1141.6

175 653.4 335 820.7 495 983.419 660 1146.4

180 658.7 340 825.86 500 988.43 665 1151.3

185 663.99 345 831.01 505 993.436 670 1156.1

190 669.28 350 836.15 510 998.438 675 1161

195 674.57 355 841.29 515 1003.436 680 1165.8

200 679.85 360 846.43 520 1008.429 685 1170.7

205 685.12 365 851.56 525 1013.417 690 1175.5

210 690.39 370 856.69 530 1018.402 695 1180.4

215 695.66 375 861.81 535 1023.381 700 1185.2

220 700.92 380 866.93 540 1028.356

225 706.18 385 872.04 545 1033.327

TABLE 2

6-4

MT2136

THERMOELECTRIC VOLTAGE IN ABSOLUTER MILLIVOLTS TYPE J THERMOCOUPLE

F Reading +5F

10 -0.611 -0.473

20 -0.334 -0.195

30 -0.056 0.084

40 0.224 0.365

50 0.507 0.648

60 0.791 0.933

70 1.076 1.220

80 1.363 1.507

90 1.652 1.797

100 1.942 2.088

110 2.233 2.380

120 2.526 2.673

130 2.820 2.967

140 3.115 3.263

150 3.411 3.560

160 3.708 3.857

170 4.006 4.156

180 4.305 4.455

190 4.605 4.755

200 4.906 5.057

210 5.207 5.358

220 5.509 5.661

230 5.812 5.964

240 6.116 6.268

250 6.420 6.572

260 6.724 6.877

270 7.029 7.182

280 7.335 7.488

290 7.641 7.794

300 7.947 8.100

310 8.253 8.407

320 8.560 8.714

330 8.867 9.021

340 9.175 9.329

350 9.483 9.636

F Reading +5F

360 9.790 9.944

370 10.098 10.252

380 10.407 10.561

390 10.715 10.869

400 11.023 11.177

410 11.332 11.486

420 11.640 11.794

430 11.949 12.103

440 12.257 12.411

450 12.566 12.720

460 12.874 12.029

470 13.183 13.337

480 13.491 13.645

490 13.800 13.954

500 14.108 14.262

510 14.416 14.570

520 14.724 14.878

530 15.032 15.186

540 15.340 15.494

550 15.648 15.802

560 15.956 16.110

570 16.264 16.417

580 16.571 16.725

590 16.879 17.032

600 17.186 17.339

610 17.493 17.646

620 17.800 17.953

630 18.107 18.260

640 18.414 18.567

650 18.721 18.874

660 19.027 19.180

670 19.334 19.487

680 19.640 19.793

690 19.947 20.100

TABLE 3

6-5

CONVERSION FACTORS

TECHNICAL APPENDIX

COMMON CONVERSION FACTORS

Multiply By To Get

BTU/hr .001054804 MJ/hr

.0002931 kW

.29285 W

BTU/Ft

.0372589 MJ/m

8.905102 kcal/m

MJ/hr 948.0434279 BTU/hr

Mj/m

26,839225 BTU/ft

kW 3414.71732 BTU/hr

.02832 m

.09290304 m

inches 25.40005 mm

feet .3048 meters

PRESSURE CONVERSIONS FACTORS

Multiply By To Get

in/H2O 0.0361 P.S.I.

25.41 mm/H2O

1.868 mm/Hg

.0025 kg/cm

.0025 bar

2.489 mbar

248.9 Pa

.2489 kPa

P.S.I 27.71 in. H2O

2.036 in. Hg

703.1 mm/H2O

51.75 mm/Hg

meters 3.281 feet

pounds .4536 kg

inches W.C. .249082 kPa

2.49082 mbar

kPa 4.01885 inches W.C.

10 mbar

mbar 0.401474 inches W.C.

kW 3.6 Mj/hr

kcal/m

Kwh/m

.1122952 BTU/ft

96.65 BTU/ft

TABLE 4

.0703 kg/cm

.0689 bar

68.95 mbar

6895 Pa

6.895 kPa

TABLE 5

UNIT CONVERSIONS

1F = .5556C

1C = 1.8F

TABLE 6

6-6

MT2136

PRESSURE CONVERSION

PRESSURE CONVERSION CHART

in/H2O P.S.I in/Hg mm/H2O mm/Hg kg/cm

1 .0361 .0735 25.41 1.868 .0025 .0025 2.489 248.9 .2489

2 .0722 .1470 50.81 3.736 .0051 .0050 4.978 497.8 .4978

3 .1083 .2205 76.22 5.604 .0076 .0075 7.467 746.7 .7467

4 .1444 .2940 101.62 7.472 .0102 .0099 9.956 995.6 .9956

5 .1804 .3673 127.0 9.335 .0127 .0124 12.44 1244 1.244

6 .2165 .4408 152.4 11.203 .0152 .0149 14.93 1493 1.493

7 .2526 .5143 177.8 13.072 .0178 .0174 17.42 1742 1.742

8 .2887 .5878 203.2 14.940 .0203 .0199 19.90 1990 1.990

9 .3248 .6613 228.6 16.808 .0228 .0224 22.39 2239 2.239

10 .3609 .7348 254.0 18.676 .0254 .0249 24.88 2488 2.488

11 .3970 .8083 279.4 20.544 .0279 .0274 27.37 2737 2.737

12 .4331 .8818 304.8 22.412 .0304 .0299 29.86 2986 2.986

13 .4692 .9553 330.2 24.280 .0330 .0324 32.35 3235 3.235

14 .5053 1.029 355.6 26.148 .0355 .0348 34.84 3484 3.484

bar mbar Pa kPa

15 .5414 1.102 381.0 28.016 .0381 .0373 37.33 3733 3.733

16 .5774 1.176 406.4 29.879 .0406 .0398 39.81 3981 3.981

17 .6136 1.249 431.8 31.752 .0431 .0423 42.31 4231 4.231

18 .6496 1.322 457.2 33.616 .0457 .0448 44.79 4479 4.479

19 .6857 1.396 482.6 35.484 .0482 .0473 47.28 4728 4.728

20 .7218 1.470 508.0 37.352 .0507 .0498 49.77 4977 4.977

21 .7579 1.543 533.4 39.22 .0533 .0523 52.26 5226 5.226

22 .7940 1.616 558.8 41.09 .0558 .0547 54.74 5474 5.474

23 .8301 1.690 584.2 42.96 .0584 .0572 57.23 5723 5.723

24 .8662 1.764 609.6 44.82 .0609 .0597 59.72 5972 5.972

25 .9023 1.837 635.0 46.69 .0634 .0622 62.21 6221 6.221

26 .9384 1.910 660.4 48.56 .0660 .0647 64.70 6470 6.470

27 .9745 1.984 685.8 50.43 .0685 .0672 67.19 6719 6.719

6-7

TECHNICAL APPENDIX

in/H2O kPaPambarbarkg/cm

28 1.010 2.056 710.8 52.26 .0710 .0696 69.64 6964 6.964

29 1.047 2.132 736.8 54.18 .0736 .0722 72.19 7219 7.219

30 1.083 2.205 762.2 56.04 .0761 .0747 74.67 7467 7.467

31 1.119 2.278 787.5 57.91 .0787 .0772 77.15 7715 7.715

32 1.155 2.352 812.8 59.77 .0812 .0796 79.63 7963 7.963

33 1.191 2.425 838.2 61.63 .0837 .0821 82.12 8212 8.212

34 1.227 2.498 863.5 63.49 .0862 .0846 84.60 8460 8.460

35 1.263 2.571 888.9 65.36 .0888 .0871 87.08 8708 8.708

36 1.299 2.645 914.2 67.22 .0913 .0896 89.56 8956 8.956

37 1.335 2.718 939.5 69.08 .0938 .0920 92.04 9204 9.204

38 1.371 2.791 964.9 70.95 .0964 .0945 94.53 9453 9.453

39 1.408 2.867 990.9 72.86 .0990 .0971 97.08 9708 9.708

40 1.444 2.940 1016 74.72 .1015 .0996 99.56 9956 9.956

41 1.480 3.013 1042 76.59 .1040 .1020 102.0 10204 10.20

mm/Hgmm/H2Oin/HgP.S.I

42 1.516 3.086 1067 78.45 .1066 .1045 104.5 10452 10.45

43 1.552 3.160 1092 80.31 .1091 .1070 107.0 10701 10.70

44 1.588 3.233 1118 82.18 .1116 .1095 109.5 10949 10.95

45 1.624 3.306 1143 84.04 .1142 .1120 112.0 11197 11.20

46 1.660 3.378 1168 85.90 .1167 .1144 114.5 11445 11.44

47 1.696 3.453 1194 87.76 .1192 .1169 116.9 11694 11.69

48 1.732 3.526 1219 89.63 .1218 .1194 119.4 11942 11.94

49 1.768 3.600 1244 91.49 .1243 .1219 121.9 12190 12.19

50 1.804 3.673 1270 93.35 .1268 .1244 124.4 12438 12.44

51 1.841 3.748 1296 95.27 .1294 .1269 126.9 12693 12.69

52 1.877 3.822 1321 97.13 .1320 .1294 129.4 12941 12.94

53 1.913 3.895 1346 98.99 .1345 .1319 131.9 13190 13.19

54 1.949 3.968 1372 100.8 .1370 .1344 134.4 13438 13.44

55 1.985 4.041 1397 102.7 .1395 .1369 136.9 13686 13.69

56 2.021 4.115 1422 104.6 .1421 .1393 139.3 13934 13.93

TABLE 7

6-8

Blodgett MT2136 Service And Repair Manual

Specifications and Main Features

Frequently Asked Questions

User Manual