Blodgett SG3240E Service Manual

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SMART GENERATION

CONVEYOR OVEN SERIES

SERVICE AND REPAIR MANUAL

BLODGETT OVEN COMPANY

www.blodgett.com

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

PN M10306 Rev C (11/01)

E 2001 - G.S. Blodgett Corporation

TABLE OF CONTENTS

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TABLE OF CONTENTS

1. INTRODUCTION

Oven Specifications 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Electrical Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gas Specifications 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. OPERATION

Standard Manual Control 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programmable Menu Control 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oven Adjustments for Cooking 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Schematics 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG2136G 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG2136E - 2 Wire 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG2136E - 3 Wire 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG2136E - 4 Wire 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG3240G 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG3240E - 3 Wire 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SG3240E - 4 Wire 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. CALIBRATION AND ADJUSTMENT

Control Identification and Registration 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gas Pressure Adjustments 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Convection Blowers 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Temperature Calibration 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Belt Speed Calibration 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. PARTS REPLACEMENT

PLC Replacement and Programming 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interface Board 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Circulating Fan Pressure Switch 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Combustion Pressure Switch Adjustment 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. TROUBLESHOOTING

Fault Display Indicators 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DC Drive System 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heating System 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Convection System 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference Tables 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heating Element Resistance 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe Resistance vs Temperature 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS

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CHAPTER 1

INTRODUCTION

SMART GENERATION

OVEN SPECIFICATIONS

VENTILATION REQUIREMENTS

A mechanically driven ventilation system is reĆ quired for the removal of excess heat and cooking vapors. For gas models, a ventilation system is also required for the removal of the products of gas combustion. The necessity for a properly designed and installed ventilation system cannot be over emphasized.

The following are general recommendations and guidelines for good ventilation. Your specific apĆ plication may require the services of a ventilation engineer or consultant

The ventilation hood must work well with the building heating, ventilation and air conditioning (HVAC) sysĆ tem. The hood exhaust and the supply air flows should be sized appropriately. Supply air must be provided by either the hood system or the building HVAC system in order to prevent a negative presĆ sure in the oven area. Supply air should replace approximately 80% of the air flow exhausted by the hood. The table below can be used as a guideline, but the correct air flow values depend on the effiĆ ciency of the hood design, the amount of air flow around the oven, and the current air flow in and out of the kitchen or oven area (for existing facilities).

inĆline tempering unit. Air supplied directly from outĆ side the building to the kitchen or oven area, nonĆ tempered, can be used as supply air but the design must accommodate potential operational and enviĆ ronmental drawbacks.

NOTE: In NO case should supply air blow at or

near the cooking chamber openings as that would adversely affect the cooking consistency and the reliability of the oven.

The hood should be sized to completely cover the equipment plus an overhang of at least 6" (15cm) on all sides not adjacent to a wall. The distance from the floor to the lower edge of the hood should not exceed 7' (2.1m). See FIGURE 2.

U.S. and Canadian installations

Refer to your local ventilation codes. Requirements may vary by city, county, province or state. In the absence of local codes, refer to the National venĆ tilation code titled, Standard for the Installation of

Equipment for the Removal of Smoke and Grease Laden Vapors from Commercial Cooking EquipĆ ment", NFPAĆ96ĆLatest Edition.

General export installations

MODEL SINGLE DOUBLE TRIPLE

Exhaust Volume - CFM (M3/min)

SG2136 400Ć500

(14Ć17)

SG3240 800Ć1000

(23Ć28)

Supply Requirements - CFM (M3/min)

SG2136 320Ć400

(12Ć14)

SG3240 640Ć800

(18Ć23)

Ideally, supply air is provided through the building HVAC system or, secondly, through the hood with an

800Ć1000

1200Ć1600

640Ć800

960Ć1280

TABLE 1

(23Ć28)

(34Ć46)

(18Ć23)

(27Ć36)

1200Ć150

0 (34Ć43)

2000Ć240

0 (57Ć68)

960Ć1200

(27Ć34)

1600Ć192

0 (46Ć54)

Installation must conform with Local and National installation standards. Local installation codes and/or requirements may vary. If you have any questions regarding the proper installation and/or operation of your Blodgett oven, please contact your local distributor. If you do not have a local disĆ tributor, please call the Blodgett Oven Company at 0011Ć802Ć860Ć3700.

WARNING: Failure to properly vent the oven can be hazardĆ ous to the health of the operator and may result in operational problems, unsatisfactory baking and possible damage to the equipment.

Damage sustained as a direct result of improper ventilation will not be covered by the ManufacturĆ er's warranty.

1-1

0" (0cm) if wall or 6" (15.2 cm)

Minimum

6" (15 .2cm)

60"

INTRODUCTION

(152.4 cm)

20"

(50.8 cm)

(22.7 cm)

Triple Stack - 6.5" (17 cm)

Double Stack - 17.5" (44.5 cm)

Single Stack - 23.5" (59.7 cm)

3" (7.6 cm)

Minimum

6" (15.2 cm)

SG2136 Series Shown

64" (162.5 cm)

Minimum

FIGURE 1

1-2

SMART GENERATION

0" (0cm) if wall or

6" (15.2 cm)

3" (7.6 cm)

Minimum

6" (15 .2cm)

Minimum

77" (196 cm)

72" (182 cm)

24"

(61 cm)

14"

(35.5 cm)

Triple Stack - 7" (17.8 cm)

Double Stack - 17.25" (43.8 cm)

Single Stack - 23.25" (59 cm)

SG3240 Series Shown

6" (15.2 cm)

Minimum

FIGURE 2

1-3

ELECTRICAL SPECIFICATIONS

INTRODUCTION

SG2136G

The SG2136G requires a 5 Amp, 50/60HZ, 1, 208Ć240VAC, 3 wire service consisting of L1, L2 and ground. Use 75_C rated cable. Size wire to NaĆ tional Electric or local codes.

SG2136E

Use 75_C rated cable. Size wire to National Electric or local codes.

The SG2136E is available in 6 electrical configuraĆ tions.

U.S. and Canadian installations (or similar)

D 76 amp, 60 HZ, 1, 208 VAC, 2 wire service

consisting of L1, L2, and ground.

D 66 amp, 60 HZ, 1, 240 VAC, 2 wire service

consisting of L1, L2, and ground.

D 44 amp, 60 HZ, 3, 208 VAC, 3 wire service

consisting of L1, L2, L3 and ground.

D 38 amp, 60 HZ, 3, 240 VAC, 3 wire service

consisting of L1, L2, L3 and ground.

General export installations

D 24 amp, 50/60 HZ, 3 WYE, 220/380 VAC, 4

wire service consisting of L1, L2, L3, neutral and ground.

D 23 amp, 50/60 HZ, 3 WYE, 240/415 VAC, 4

wire service consisting of L1, L2, L3, neutral and ground.

SG3240G

The SG3240G requires a 5 Amp, 50/60HZ, 1, 208Ć240VAC, 3 wire service consisting of L1, L2 and ground. Wiring from the power source to these units must be a minimum of #16 AWG CU. stranded wire or larger.

SG3240E

Use 90_C rated cable. Size wire to National Electric or local codes.

The SG3240E is available in 4 electrical configurations.

U.S. and Canadian installations (or similar)

D 69 amp, 50/60 HZ, 3, 208 VAC, 4 wire service

consisting of L1, L2, L3, and ground.

D 80 amp, 50/60 HZ, 3, 240 VAC, 4 wire service

consisting of L1, L2, L3, and ground.

General export installations

D 41.5 amp, 50/60 HZ, 3 WYE, 230/400 VAC,

4 wire service consisting of L1, L2, L3, neutral and ground.

D 40 amp, 50/60 HZ, 3 WYE, 240/415 VAC, 4

wire service consisting of L1, L2, L3, neutral and ground.

THE BLODGETT CANNOT ASSUME RESPONSIĆ BILITY FOR LOSS OR DAMAGE SUFFERED AS A RESULT OF IMPROPER INSTALLATION.

WARNING!! Incorrect single phase wiring may result in exĆ tensive damage to electrical components and fire in the electrical box.

1-4

SMART GENERATION

SG2136E Single Phase Power

SG2136E and SG3240E Delta Three Phase Power

U.S. and Canadian Installations (or similar)

208Ć240

208 or 240

(typical)

OvenSupply

FIGURE 3

SG2136G and SG3240G

400/ 415L1

208Ć240

230/ 240

OvenSupply

SG2136E and SG3240E Wye Three Phase Power

General Export Installations

400/415

1-5

GAS SPECIFICATIONS

INTRODUCTION

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.

GAS REQUIREMENTS

The firing rate for the SG3240G is 110,000 BTU/hr (32.2 kW/hr) (116 MJ/hr). The firing rate for the SG2136G is 60,000 BTU/hr (17.6KW) (63 MJ/hr).

SG2136G DOMESTIC AND GENERAL EXPORT

Natural Gas Propane Gas

Gas Line Sizing

Single

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.

3/4" line

Double

Triple

Orifice Size 3.45mm (0.136") diameter 2.08mm (0.082") diameter

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

Static

Operational

Manifold Burner Pressure 3.5" 0.87 8.7 10" 2.50 25.0

SG2136G CE APPROVED UNITS

Type of

Gas

G25 25 13 3,45 5,1 2 x 0,63 17,6 Nat. Gas

G20 20 8.7 3,45 5,1 2 x 0,63 17,6 Nat. Gas

G20/G25 20/25 Totally Inscrewed

G30 30/50 20 2,08 5,1 2 x 0,30 17,6 Butane

G31 30/37/50 25 2,08 5,1 2 x 0,30 17,6 Propane

Inlet

Pressure

mbars

Burner Pressure

Pressure Regulator

5.5"

mbars

3/4" line

1" line

1.74

1.36

Diameter

3,45 plus

preĆinjector

TABLE 2

Injector

17.4

13.7

3/4" line

12.5"

11"

Air

Opening

5,1 2 x 0,63 17,6 Nat. Gas

Injector

Pilot

3.11

2.73

Standard

Delivery

Value kW (HS)

31.1

27.4

1-6

SMART GENERATION

SG3240G DOMESTIC AND GENERAL EXPORT

Gas Line Sizing

Natural Gas Propane Gas

Single

Double

Triple

Orifice Size 4.80mm (0.189") diameter 2.82mm (0.111") diameter

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

Static

Operational

Manifold Burner Pressure 3.5" 0.87 8.7 10" 2.50 25.0

SG3240G CE APPROVED UNITS

Type of

Gas

G25 25 13.5 4,8 10 2 x 0,63 32,2 Nat. Gas

G20 20 8.7 4,8 10 2 x 0,63 32,2 Nat. Gas

G20/G25 20/25 Totally Inscrewed

G30 30/50 20 2,8 10 2 x 0,30 32,2 Butane

G31 30/37/50 25 2,8 10 2 x 0,30 32,2 Propane

Inlet

Pressure

mbars

Burner Pressure

Pressure Regulator

5.5"

mbars

3/4" line

1Ć1/4" line

1.74

1.36

Injector

Diameter

4,8 plus

preĆinjector

17.4

13.7

3/4" line

1" line

1Ć1/4" line

12.5"

11"

Air

Opening

10 2 x 0,63 32,2 Nat. Gas

Injector

Pilot

3.11

2.73

Standard

Delivery

Value kW (HS)

31.1

27.4

TABLE 3

1-7

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INTRODUCTION

1-8

CHAPTER 2

OPERATION

SMART GENERATION

STANDARD MANUAL CONTROL

MANUAL CONTROL DESCRIPTION

1. DIGITAL DISPLAY - two line display gives the time, temperature and other control related inĆ formation.

2. OVEN ON/OFF (ON/STANDBY) - controls power to the oven.

3. TEMPERATURE KEY - press to change the cook temperature.

4. ARROW KEYS - press to change the set time and temperature in the display.

5. TIME KEY - press to change the cook time.

6. ENTER/RESET KEY - press to save new cook time or temperature. Also press to silence the alarm in case of a fault. The alarm will sound every ten seconds until the fault clears.

3 4 5

FIGURE 1

2-1

OPERATION

NOTE: The following example is in _F. The display

will read _C if programmed in celsius.

To turn the oven on:

1. Press the OVEN ON/OFF key (2). The control defaults to the last time and temperature setĆ tings used.

The display reads:

NOTE: HEAT appears in the top line of the disĆ

play whenever the control calls for heat.

2. The fans begin to run. The conveyor belt beĆ gins to travel at the set cook time. The heat rises to the setpoint temperature.

3. When the oven reaches the set temperature, READY and SET TEMP flash alternately in the top line of the display and an audible alarm sounds.

To change the cook temperature:

1. Press the TEMPERATURE key (3).

The display reads:

2. Press the ARROW keys (4) to scroll to the deĆ sired cook temperature.

3. Press the ENTER key (6) to set the new cook temperature.

SET TEMP XXXF HEAT

COOK TIME XX:XX

SET POINT TEMP

XXXF

To change the cook time:

1. Press the TIME key (5).

The display reads:

2. Press the ARROW keys (4) to scroll to the deĆ sired cook time.

3. Press the ENTER key (6) to set the new cook time.

To display the actual oven temperature:

1. Press both ARROW keys (4) .

The display reads:

2. Press the down arrow key to return the display to the setpoint time and temperature.

To turn the oven off:

1. Press the OVEN ON/OFF key (2). The oven is equipped with a coolĆdown feature for motor shaft and bearing protection. This enables the blower motor(s) to run regardless of the conĆ troller status. The blower(s) continue to run unĆ til the oven cools to a safe temperature.

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.

SET COOK TIME

XX:XX

TEMP XXXF

DOWN - EXIT

2-2

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

SMART GENERATION

PROGRAMMABLE MENU CONTROL

MENU CONTROL DESCRIPTION

1. DIGITAL DISPLAY - two line display gives the time, temperature and other control related inĆ formation.

2. OVEN ON/OFF (ON/STANDBY) - controls power to the oven.

3. ARROW KEYS - press to change the time and temperature in the display. Also press to scroll through menus during programming.

4. MENU KEYS - programmable product keys. Up to four different time and temperature setĆ tings can be saved.

5. ENTER/RESET KEY - press to save settings while programming. Also press to silence the alarm in case of a fault. The alarm will sound every ten seconds until the fault clears.

FIGURE 2

2-3

MENU PROGRAMMING

OPERATION

NOTE: The following example is in _F. The display

will read _C if programmed in celsius.

To enter programming mode:

1. With the oven off, press and hold the UP ARĆ ROW key (3) and the ENTER/RESET key (5) siĆ multaneously for approximately three seconds.

The display reads:

2. Press and hold the UP ARROW key (3) until the bottom line of the display reads 111 (the store access code).

3. Press the ENTER/RESET key (5) to enter the programming mode.

To program the menu keys:

1. The display reads:

2. Press the MENU key (4) to be programmed.

NOTE: For this example we will program menu

key 1.

3. The display reads:

Use the ARROW keys (3) to scroll to the deĆ sired cook temperature. Press the ENTER key (5) to store the new cook temperature.

ACCESS CODE

000

SELECT MENU KEY MENU 1, 2, 3, OR 4

MENUĆ1 SELECT TEMP

XXXF PRESS ENTER

OPERATION

1. Press the OVEN ON/OFF key (2). The control defaults to the last time and temperature setĆ tings used.

The display reads:

NOTE: HEAT appears in the top line of the disĆ

play whenever the control calls for heat.

2. Press the desired MENU key (4).

3. The fans begin to run. The conveyor belt beĆ gins to travel at the set cook time. The heat rises to the setpoint temperature.

4. When the oven reaches the set temperature, READY and SET are displayed. The heat rises to the setpoint temperature. TEMP flash alterĆ nately in the top line of the display and an audiĆ ble alarm sounds.

NOTE: To change the cook time and temperaĆ

ture press any of the other menu keys.

To display the actual oven temperature:

1. Press both ARROW keys (4) .

The display reads:

2. Press the down arrow key to return the display to the setpoint time and temperature.

MĆX TEMP XXXF HEAT

COOK TIME XX:XX

XXXF

DOWN - EXIT

4. The display reads:

Use the ARROW keys (3) to scroll to the deĆ sired cook time. Press the ENTER key (5) to store the new cook time.

5. The display flashes:

To exit the programming mode:

1. Press and hold the UP ARROW key (3) and the ENTER/RESET key (5) simultaneously for approximately three seconds.

NOTE: If no key is pressed for 60 seconds, the

control automatically exits the program mode.

MENUĆ1 COOK TIME

XX:XX PRESS ENTER

MENUĆ1

PROGRAM DONE

To turn the oven off:

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.

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

2-4

SMART GENERATION

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 guideĆ lines vary depending on the food items.

AIR FLOW ADJUSTMENTS

Slide the product clearance adjustment plates to the lowest possible setting for your menu items. Lowering the clearance plates will reduce the amount of hot air escaping from the chamber openings.

Air flow adjustments may be necessary to fine tune the oven for your particular product. The air plate, located at the top of the baking chamber, contains 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. See FIGURE 4.

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 plate 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 plate.

8. Close the front access door.

The following examples illustrate air flow regulation.

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.

D 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.

D 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.

D 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.

2-5

Air Slides

OPERATION

BlockĆOff

Plate

Air Flow Plate

Air Flow Plates

Air Flow Plate

SG2136 Series Shown

FIGURE 3

Product Clearance

Adjustment Plate BlockĆOff Plate

SG3240 Series Shown

FIGURE 4

2-6

SMART GENERATION

SCHEMATICS

SG2136G

FIGURE 5

2-7

SG2136E - 2 WIRE

OPERATION

FIGURE 6

2-8

SMART GENERATION

SG2136E - 3 WIRE

FIGURE 7

2-9

SG2136E - 4 WIRE

OPERATION

FIGURE 8

2-10

SMART GENERATION

SG3240G

FIGURE 9

2-11

SG3240E - 3 WIRE

OPERATION

FIGURE 10

2-12

SMART GENERATION

SG3240E - 4 WIRE

FIGURE 11

2-13

CHAPTER 3

CALIBRATION AND

ADJUSTMENT

SMART GENERATION

CONTROL IDENTIFICATION AND REGISTRATION

The following instructions are for both the standard manual and programmable menu PLC controls. See FIGURE 12 for control identification.

Standard Manual PLC Control

CONTROL REGISTRATION

NOTE: The following control registration proceĆ

dure applies to installations in North AmeriĆ ca only.

The installer may be required to obtain a registration number from the Blodgett Oven Service Department before the unit can be operated. Use the following procedure for control registration:

1. Registration is required if after applying power to the oven for the first time the display reads:

CALL SRVC FOR REG #

1Ć800Ć331Ć5842

2. Note the serial number of the oven and call Blodgett Oven Service at the number shown on the display to obtain your registration number.

3. Press the ENTER/RESET key.

4. The display reads:

Use the arrow keys to scroll to the registration number for your unit. Press the ENTER/RESET key to enter the registration number.

REG # XXXX

Menu Programmable PLC Control

FIGURE 12

5. The display reads:

6. The oven can now be turned on.

VENTILATION

Ignite a smoke candle inside the oven cavity. Note the amount of smoke removed by the ventilation system. The recommended amount of smoke to be removed is 90-100%.

OVEN OFF

3-1

GAS PRESSURE ADJUSTMENTS

REGULATED GAS PRESSURE

CALIBRATION AND ADJUSTMENT

NOTE: Gas models only.

1. Let the oven heat to 510_F (266_C).

2. Check the pressure at the tap on the multiĆfuncĆ tion gas valve or at the tap on the tee fitting at the rear of the electrical box. See FIGURE 13.

Incoming 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. (27.4 mbar) for propane gas. This measurement should be taken at the Incoming Line Pressure Tap. The maximum pressure should not exceed 13" W.C. (32.3 mbar).

NOTE: For installations using GĆ20/GĆ25 gas, the

regulator must be completely screwed in.

The manifold pressure must be 3.5" W.C. (8.7 mbar) for natural gas and 10" W.C. (25 mbar) for propane gas. This measurement should be taken at the Manifold and Pilot Pressure Tap.

Incoming Line Pressure Tap*

The incoming and manifold pressure should be meaĆ sured at the same time with two water manometers. The oven must be turned on and the main burner valve open. This method will reveal any obstructions in the pipe line or inadequate pipe size.

To adjust the manifold pressure

1. Unscrew the regulator adjustment cover cap.

2. Turn the adjusting screw inside the gas valve.

NOTE: Turn the screw clockwise to raise the

manifold pressure and counterĆclockĆ wise to lower it.

3. Reinstall the cover cap.

NOTE: The cover cap acts as a flow limiter, in the

event of a diaphragm rupture it will limit the flow of gas into the building.

Water

Manometer

Regulator Adjustment

Cover Cap

Regulator

Adjustment Screw

(inside)

Manifold and

Pilot Pressure Tap*

Water

Manometer

* Pipe plug used in US/Canadian ovens

FIGURE 13

3-2

SMART GENERATION

PRIMARY AIR ADJUSTMENT

NOTE: Gas models only.

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.

1. Visually examine the quality of the flame.

2. If it needs adjusting, increase or decrease the air mixture to attain the best flame quality. Be sure to tighten the lock nut when finished.

3. If the combustion blower alarm is actuated, the combustion pressure switch may need to be readjusted. The adjustment screw is visible on the top of the pressure switch.

NOTE: The pressure switch is located on the

ignition control board on the pull out tray at the bottom of the electrical box.

COMBUSTION BLOWER PRESSURE SWITCH ADJUSTMENT

The adjustment of the pressure switches after installation is extremely important. The switch

proves that the gas combustion air blower is operaĆ tional. If the pressure switch stays open, the oven will not heat. The operator will be given both audiĆ ble and visual alarms for a combustion blower failĆ ure: COMBUSTION BLWR FAIL"

If the switch is adjusted too sensitively (- clockĆ wise), it will not open when the combustion blower is turned off. In this case, when the oven is turned on again, the control system would see the presĆ sure switch as stuck closed." The oven will not heat, and the operator will be given both audible and visual alarms indicating combustion pressure switch failure: COMB PS FAILURE."

1. With the oven OFF and the combustion blower OFF (it'll shut off 20 seconds after turning the oven off), turn the adjustment screw clockwise (-) just until the pressure switch closes (indiĆ cated when the LED marked COMB PS" is illuĆ minated on the control tray).

2. Slowly turn the adjustment screw counterclockwise approximately (+) 1/4 turn PAST the point where the switch opens (LED shuts off).

3. Turn the oven ON.

4. Place your hand over the circular air shutter on the combustion blower. Close off part of the air opening with your hand and fingers.

NOTE: Adjust the switch to close only when

the combustion fan is operating either with very

5. If the switch is adjusted properly, an audible alarm sounds and a fault appears in the disĆ play indicating a combustion blower failure: COMBUSTION BLWR FAIL." If so, no further adjustment is necessary. If there is no alarm, the pressure switch needs adjustment as folĆ lows:

A.) Turn the adjustment screw counter-

clockwise (+) another 1/4 turn and test again if it will close easily by blocking it with your hand. This allows the pressure switch to open more easily.

little or no restriction

3-3

Heat

Relay

Circulation Blowers'

Pressure Switch

(See View D)

Blower 2

Relay

Blower 1

Relay

Interface Board - View A

CALIBRATION AND ADJUSTMENT

View B

SW4

ENB 2 DIR 2

Switch 4

(See View B)

Interface Board

(See View A)

ENB 1 DIR 1

Ignition Control

Board

(See View C)

Combustion Blower Pressure Switch

(See View D)

Ignition Control Board - View C

Interface Slide Tray

(SG3240G shown)

Typical circulation blower pressure expected is .30" W.C. (SG3240) or .25" W.C. (SG2136)

High Side Port (Internal Snubber) Connect Pressure Hose here

Adjustment Screw

Pressure Switch - View D

FIGURE 14

3-4

SMART GENERATION

CONVECTION BLOWERS

MOTOR ROTATION OF CONVECTION BLOWERS

The correct amp draw for most gas conveyor ovens is 1 amp when the oven is hot.

If the amp draw is less than .5, remove the back of the oven and check for proper motor rotation direcĆ tion. See FIGURE 15.

Due to its vertical positioning the motor direction is reference from the end of the motor (EOM) as viewed from the rear of the oven.

Slinger

Cooling Fan

Blower

Motor

CHECKING THE LOW LIMIT OF THE BLOWERS:

1. Turn the oven on. Let it heat to 200_F (93_C). Shut the oven off. The blowers should come back on in several seconds.

NOTE: Open the small front access door to

speed cooling.

NOTE: To view actual temperature, press the

arrow keys simultaneously. To return to normal display operation, press the down arrow key.

2. When the blowers shut off, turn the oven on. Press both arrow keys to display the actual temperature and verify that the blowers shut off between 135_F and 170_F (57Ć77_C).

SG3240

BLOWER WHEEL ROTATION

Motor #1 Motor #2

(Side view)

Control Box

(Top view)

FIGURE 15

3-5

TEMPERATURE CALIBRATION

CALIBRATION AND ADJUSTMENT

After the oven has been cycling at the normal temĆ perature for 60 minutes, place a temperature probe in the center of the oven to verify proper caliĆ

bration. If the oven is not cycling to within  5_F (3_C) of the setpoint use the following calibration procedure.

To Enter Configuration and Calibration Mode:

1. With the oven off, press and hold the UP ARĆ ROW key and the ENTER/RESET key simultaĆ neously for approximately three seconds.

The display reads:

2. To enter the service level access menu, press and hold the UP ARROW key until the bottom line of the display reads 331.

NOTE: If no key is pressed within 60 seconds

or if the UP ARROW and ENTER/RESET keys are pressed simultaneously for about three seconds, the display will return to the previous mode.

3. Press the ENTER/RESET key to enter the ConĆ figuration and Calibration mode.

4. The display reads:

ACCESS CODE

000

SELECT PROGRAM

MAN/MENU MODE

To Calibrate the Cook Temperature:

1. The display reads:

Use the arrow keys to toggle between TEMP and TIME. When the display reads TEMP, press the ENTER/RESET key.

NOTE: The control will stay in the calibration

mode until the UP ARROW and the ENĆ TER/RESET keys are pressed simultaĆ neously for about three seconds.

2. The oven continues to operate; however, the conveyor does not move.

3. The display reads:

Use the arrow keys to toggle between_ F and_ C. Press the ENTER/RESET key to select the deĆ sired temperature units.

4. The display reads:

Use the arrow keys to scroll to the desired calĆ ibration set point temperature. Press the ENĆ TER/RESET key to select that temperature.

SELECT TEMP/TIME CAL

XXXX

SELECT TEMP MODE

DEGREES X

SELECT CAL SET POINT

XXXF

Use either arrow key to scroll through the choices on the bottom line of the display. When the bottom line reads CALIBRATION ROUTINE press the ENTER/RESET key.

5. The display reads:

NOTE: The temperature in line two of the disĆ

Use the arrow keys to scroll to the actual temĆ perature measured by the probe. Use the averĆ age of the high and low temperatures seen during heat cycling. Press the ENTER/RESET key to enter the probe temperature.

3-6

SET POINT TEMP XXXF

CAL PROBE TEMP XXXF

play will be flashing.

SMART GENERATION

6. The display reads:

NOTE: The offset equals the setpoint minus

the probe temperature.

NOTE: The top line now displays the operating

oven temperature including the offset.

You can use the arrow keys to fine tune the offĆ set by scrolling to a desired offset value. Press the ENTER/RESET key to accept the offset.

7. The display reads:

Press the up arrow key to exit the Temperature Calibration mode and return to the service levĆ el menu or press the down arrow key to return to step 3 of the temperature calibration proceĆ dure.

OVEN TEMP XXXF

OFFSET +(-)XXXF

CALIBRATION DONE?

UP-EXIT DOWN-CONT

To Exit Configuration and Calibration Mode:

1. Press and hold the UP ARROW and ENTER/ RESET keys simultaneously for approximately three seconds.

3-7

BELT SPEED CALIBRATION

CALIBRATION AND ADJUSTMENT

Place an object on the belt. Time its passage from entrance to exit. If the actual speed is not within 

5 seconds of the set time, check the calibration setĆ tings as follows.

NOTE: Measure using the leading or the trailing

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

To Enter Configuration and Calibration Mode:

1. With the oven off, press and hold the UP ARĆ ROW key and the ENTER/RESET key simultaĆ neously for approximately three seconds.

The display reads:

2. To enter the service level access menu, press and hold the UP ARROW key until the bottom line of the display reads 331.

NOTE: If no key is pressed within 60 seconds

or if the UP ARROW and ENTER/RESET keys are pressed simultaneously for about three seconds, the display will return to the previous mode.

3. Press the ENTER/RESET key to enter the ConĆ figuration and Calibration mode.

4. The display reads:

Use either arrow key to scroll through the choices on the bottom line of the display. When the bottom line reads CALIBRATION ROUTINE press the ENTER/RESET key.

ACCESS CODE

000

SELECT PROGRAM

MAN/MENU MODE

To Calibrate the Belt Speed:

1. The display reads:

Use the arrow keys to toggle between TEMP and TIME. When the display reads TIME, press the ENTER/RESET key.

NOTE: The control will stay in the calibration

mode until the UP ARROW and the ENĆ TER/RESET keys are pressed simultaĆ neously for about three seconds.

2. The display reads:

Use the arrow keys to scroll to the proper oven length. Press the ENTER/RESET key to select the correct oven length.

NOTE: Refer to the table on the next page for

correct calibration values.

3. The display reads:

Use the arrow keys to scroll to the proper numĆ ber of teeth on the conveyor shaft sprocket. Press the ENTER/RESET key to select the corĆ rect number of shaft teeth.

4. The display reads:

Use the arrow keys to scroll to the proper numĆ ber of teeth on the motor shaft sprocket. Press the ENTER/RESET key to select the corĆ rect number of motor teeth.

SELECT TEMP/TIME CAL

XXXX

SELECT OVEN LENGTH

SELECT SHAFT TEETH

SELECT MOTOR TEETH

5. The display reads:

Use the arrow keys to scroll to the correct belt radius. Press the ENTER/RESET key to select the correct belt radius value.

3-8

SELECT BELT RADIUS

X.XXXX

SMART GENERATION

6. The display reads:

Use the arrow keys to scroll to the correct moĆ tor ratio. Press the ENTER/RESET key to select the correct motor ratio value.

7. The display reads:

Press the up arrow key to exit the Belt Speed Calibration Mode and return to the service levĆ el menu, or press the down arrow key to return to step 2 of the belt speed calibration proceĆ dure.

Model Oven Length Shaft Teeth Motor Teeth Belt Radius Motor Ratio

SG2136 36" 30 30 0.8850 18

SG3240 40" 15 15 0.8850 18

SELECT MOTOR RATIO

TIME CAL DONE?

UP-EXIT DOWN-CONT

To Exit Calibration Mode:

1. Press and hold the UP ARROW and ENTER/ RESET keys simultaneously for approximately three seconds.

3-9

CHAPTER 4

PARTS REPLACEMENT

SMART GENERATION

PLC REPLACEMENT AND PROGRAMMING

PLC REMOVAL AND REPLACEMENT

1. Remove burner and control access cover.

2. Disconnect the ribbon cables.

3. Disconnect power supplies from both the PLC and the RTD converter.

4. Remove the probe wires from the RTD convertĆ er.

5. Press down on the retaining latches that hold the PLC and the RTD converter to the din rail.

6. Separate the PLC and RTD converter from each other.

7. Reverse steps 1-6 to install the new PLC.

Ribbon Cable plugs in here

Display

plugs in here

Power Supply

plugs in here

PLC PROGRAMMING

1. With the oven off, press the UP ARROW key and the ENTER/RESET keys simultaneously for approximately 3 to 5 seconds. The display will read ACCESS CODE.

2. To enter the service access level, press and hold the UP ARROW key until the bottom line of the display reads 331.

3. After 331 appears in the display, press the ENĆ TER/RESET key. The top line of the display reads SELECT PROGRAM. The bottom line of the display reads MAN/MENU.

4. Press the ENTER/RESET key. Use the ARROW keys to select either manual or menu mode. Press the ENTER/RESET key to select your choice.

5. Use the ARROW keys to scroll to the twin belt choice. Press the ENTER/RESET key to enter the menu. Use the ARROW keys to select your choice.

6. Press the ENTER/RESET key. Use the ARROW keys to scroll to the gas or electric choice. Press the ENTER/RESET key to enter the menu. Use the ARROW keys to select your choice.

Latch release

RTD Converter

PLC

FIGURE 1

7. Press the ENTER/RESET key. Use the ARROW keys to scroll to the calibration mode. Press the ENTER/RESET key to enter the menu.

8. See page 3-8 Belt Speed Calibation instrucĆ tions.

9. See page 3-6 for Temperature Calibration inĆ structions.

RTDs plug in here

4-1

INTERFACE BOARD

PARTS REPLACEMENT

NOTE: The interface board is sensitive to electroĆ

static discharge. Proper grounding preĆ cautions are required before handling the interface board.

REMOVAL AND REPLACEMENT

1. Remove the ribbon clable and other harnesses from the board.

2. Remove the pressure switch.

3. Remove the old board from the control panel.

4. Install the new board by reversing the above mentioned procedures.

Circulation Blowers'

Pressure Switch

Blower 2

Relay

Blower 1

Relay

Heat

Relay

BELT DIRECTION

NOTE: If motor direction is changed the belt direcĆ

tion must also be changed.

1. Locate the enable/disable switches and direcĆ tion switches on the IFB.

2. Toggle the enable/disable switch to the off position.

3. Choose the direction you wish the belt to travel.

4. Turn on the enable/disable switch.

5. The motor should be going in the direction you want the belt to travel. If the motor is going in the wrong direction, repeat this procedure.

View A

Switch 4

(See View A)

SW4

ENB 2

DIR 2

ENB 1

DIR 1

K1 LED

FIGURE 2

4-2

SMART GENERATION

CIRCULATING FAN PRESSURE SWITCH

REPLACEMENT

1. If the oven contains pressure switch M9422 (see FIGURE 3), remove and discard.

2. Carefully remove and discard the jumper wires from the pressure switch lead wires.

NOTE: If the lead wires are damaged,the interĆ

face board will need replacement.

3. Install the new pressure switch. See FIGURE 4 and FIGURE 5.

Pressure Switch M9422

FIGURE 3

ADJUSTMENT

The adjustment of the circulation air pressure switch after installation is extremely important.

The switch proves that the hot air circulation blowers are operational. If the pressure switch is open, the oven will not heat. If it is adjusted properly, it will also detect if either blower has stopped for any reason. The operator will be given both audible and visual alarms for a blower failure: CIRC BLOWER FAIL."

If the switches are adjusted too sensitively (-" clockwise), they might not open when the circulatĆ ing fans are turned off. In this case, when the oven is started again, the control system would see the pressure switch as stuck closed." The oven will not heat, and the operator will be given both audiĆ ble and visual alarms indicating blower pressure switch failure: CIRC PS FAILURE."

1. Turn the oven ON. Set the temperature to 550°F (288°C).

NOTE: If a Blower Failure alarm occurs during

heating, turn the adjustment screw on the circulation pressure switch clockĆ wise (-) about 1/4 turn; the switch should stay closed at a higher temperĆ ature now. Turn the oven OFF (into Standby) and then ON to continue heating.

NOTE: The oven has a cool down feature that

causes the circulation blowers to conĆ tinue to operate until an oven temperaĆ ture between 130°F (54°C) and 170° F (77°C) is reached. Turning the oven off and then on again will cause all blowĆ ers to shut off for approximately 5 secĆ onds to verify pressure switch funcĆ tion.

2. When the oven reaches the set point, turn the oven OFF and then ON again to shut off the blowers momentarily.

3. While the oven is off for the 5Ćsecond period, REMOVE one of the circulation blower relays.

Do not remove the relay when the blowers are in operation or failure to the Interface Board may result.

4. After 5 seconds, the blowers start. If the switch is adjusted properly an audible alarm sounds, and a message appears in the display indicatĆ ing a Blower Failure. If no alarm occurs, skip to step 5. If the alarm actuates, no further adjustĆ ment is necessary. Turn the oven OFF and back ON again to get the 5Ćsecond off period, and REINSTALL the circulation blower relay during the off period.

5. If there is no alarm, the pressure switch needs adjustment. Turn the adjustment screw counterĆ clockwise (+) slowly until the switch opens and the alarm actuates. Turn the oven OFF and back ON again and REINSTALL the circulation blower relay while the oven is in the off period. Let the oven heat up to 550°F (288°C) again (step 1 above) and make sure the pressure switch stays closed. GO TO STEP 2.

4-3

Circulation Blower Relays

Typical circulation blower pressure expected is .30" W.C. (SG3240) or .25" W.C. (SG2136)

PARTS REPLACEMENT

See FIGURE 5 for Detail Circulation Pressure Switch

FIGURE 4

- Increases sensitivity or less pressure required

+ Decreases sensitivity or more pressure required

Adjustment Screw

SG3240 Pressure Switch

FIGURE 5

High Side Port (Internal Snubber) Connect Pressure Hose here

4-4

SMART GENERATION

COMBUSTION PRESSURE SWITCH ADJUSTMENT

The adjustment of the pressure switches after installation is extremely important. The switch

ADJUSTMENT

- Increases sensitivity or less pressure required

+ Decreases sensitivity or more pressure required

2. Slowly turn the adjustment screw counterclockwise approximately (+) 1/4 turn PAST the point where the switch opens (LED shuts off).

3. Turn the oven ON.

4. Place your hand over the circular air shutter on the combustion blower. Close off part of the air opening with your hand and fingers.

Adjust the switch to close only when the comĆ

bustion fan is operating either with very little or no restriction

6. Turn the adjustment screw counter-clockwise (+) another 1/4 turn and test again if it will close easily by blocking it with your hand. This allows the pressure switch to open more easily.

Minimum pressure expected is .25" W.C.

Adjustment Screw

SG3240 Pressure Switch

FIGURE 6

High Side Port (Internal Snubber) Connect Pressure Hose here

4-5

This page intentionally left blank.

PARTS REPLACEMENT

4-6

CHAPTER 5

TROUBLESHOOTING

SMART GENERATION

FAULT DISPLAY INDICATORS

If a fault should occur, access the second level proĆ gramming and proceed to the hour meter menu.

To access second level programming:

1. Hold the UP ARROW and ENTER/RESET keys simultaneously for approximately 3 seconds. The display will indicate the access mode.

2. Press and hold the UP ARROW key until the display reads 3 3 1.

3. Press the ENTER/RESET key to enter the conĆ figuration mode.

To check the hour meter:

1. Use either ARROW key to scroll through the choices on the bottom line of the display. Scroll until the hour meter shows in the display.

FAULT DISPLAY DEFINITION

D IGNTN/BURNER ALARM RESET or CALL SERVICE

D BLOWER ZONE HOT - CHECK HOOD/LOUVERS

D BLOWER ZONE OVERTEMP - CALL SERVICE

2. Note the amount of time in the display on your invoice.

NOTE: The hour meter cannot be reset unless

the PLC is replaced.

To return to user mode:

1. Press and hold the UP arrow and ENTER/REĆ SET key simultaneously for approximately 3 secĆ onds. The display returns to the user mode.

NOTE: The display will also return to the user

mode if no key is touched for 60 secĆ onds.

D Ignition system in lockout.

D Blower zone is above 125_F and the motors are

still running.

D Oven heat is disabled and all blowers are operatĆ

ing to lower the blower compartment ambient temperature.

D CIRC BLOWER FAILURE - CALL SERVICE

D COMBUSTION BLWR FAIL - CALL SERVICE

D COMB PS FAILURE - CALL SERVICE

D HI LIMIT TRIP - RESET EGO

D CONTROL HIGH TEMP

D FAULT - CHECK OVEN PROBE

D FAULT - CK BLOWER PROBE

D HI LIMIT TRIP

D BELT MOTOR FAULT

D NO FLAME SENSE

D HIGH LIMIT SENSE

D CIRC PS FAILURE

D Indicates one or more blower motor failures. ReĆ

fer to the flowcharts on the following pages.

D Indicates a combustion blower failure or EIFB.

D Indicates that either a pressure switch is stuck, or

defective, or the tubing is obstructed.

D Reset manual resettable hi limit.

D Indicates a high control box ambient temperature

at or above 140_F. Check the cooling fans.

D Indicates a defective oven probe.

D Indicates a defective blower compartment probe.

D The oven cavity probe is sensing that the temperĆ

ature is at or above 625_F.

D The control thinks the conveyor belt is not running.

D The control does not sense a pilot flame.

D The oven is at or above 600_F.

D Indicates that either a pressure switch is stuck, or

defective, or the tubing is obstructed.

TABLE 1

5-1

DC DRIVE SYSTEM

TROUBLESHOOTING

DC Drive System

Inoperative

Hz varies dependent on time.

Replace

PLC

Is oven on?

Is motor

feedback #1

Is enable

switch in the OFF

position?

Measure enable

signal at J7 Pin 4.

the signal

approximately

5VDC?

Measure Hz at J7

Pin 1.

Is value

between

40-5000Hz?

lit?

Yes

Turn oven on.

Is X-O on PLC

Illuminated?

Yes

Toggle to the

OFF position.

Remove wire from J7 Pin 4. Measure

VDC on the end of the wire to ground.

the voltage

approximately

5VDC?

Replace

interface board.

Replace PLC.

Yes

Replace

driver board.

Yes

Check output on

driver board.

output between

10-14

VAC?

Yes

Replace Motor.

FIGURE 1

5-2

Replace

driver board.

SMART GENERATION

HEATING SYSTEM

Heat

Inoperative

Is oven on?Is oven on?

Yes

Turn oven off. Let all indicator lights go

off for at least 5 seconds.

power supply.

Check blowers and

pressure switch.

Check PLC and interface board.

From C on

last page of

chart.

Check

Are any

indicator lights

lit?

Yes

Is oven

in cool down

mode?

Yes

cir. pressure

indicator

lit?

Yes

Are

all other

input LEDs

out?

Yes

Toggle oven to

ON.

Are all

indicator lights

off?

Yes

Reference section

on related indicator.

Are

blowers, cooling fan

& cir. pressure

indicators

lit?

Yes

Wait three

seconds.

No No

Replace interface board

Are

corresponding

LEDs on PLC

lit?

Yes

and/or ribbon cable.

5-3

Replace PLC.

Continued on next page

TROUBLESHOOTING

combustion

blower ind.

lit?

Yes

combustion

pressure ind.

lit?

Yes

Wait ten

seconds.

Is pilot

indicator

lit?

Yes

Replace combustion pressure switch.

Is Y3 LED

on PLC lit?

Yes

Replace IEFB or

ribbon cable.

combustion motor

rotating?

Yes

Clear or replace tubing.

Is Y5 LED

on PLC lit?

Yes

24VDC at

ignition control

J1 pin 6?

Replace PLC.

Verify

24VDC to

motor.

Yes

Replace motor.

Replace PLC

Replace

interface board

Replace interface

board or relay.

Did pilot valve energize?

Yes

24VDC at

ignition control

J1 pins

1&2?

Yes

Replace

ignition board.

Is 24VDC

applied to pilot

coil?

Yes

Replace coil

or valve.

5-4

Check wiring.

Replace

ignition board.

Continued on next page

SMART GENERATION

Increase setpoint

above ambient temperature.

Replace

PLC

Is PLC

Y6 lit?

Yes

Replace

interface board.

ignition

proof ind.

lit?

Yes

No Is there

a heat demand?

Yes

No Is heat

indicator

lit?

Yes

Is K1

LED on interface

board

lit?

Yes

Is pilot light

lit?

Yes

pilot out

when power

off?

Yes

Go back to C on

first page of chart.

Replace K1 relay

or interface board.

Check gas supply

Replace Valve

and value.

24VDC to coil

main valve

energized?

Yes

main burner

lit?

Yes

Done

FIGURE 2

NoIs

Check and/or

replace wire.

Replace coil

and/or valve assembly.

5-5

TROUBLESHOOTING

Heat/K1

LED

Relay/K1

Relay Fault

Reset Button

Heat

Blower 1

LED

K1 LED

Blower 1

Relay

Blower 2

LED

Relay Fault

Indicator LED

Blower 2

Relay

Circulation Blowers Pressure Switch

Switch 4

(See View A)

View A

SW4

ENB 2

DIR 2

ENB 1

DIR 1

K1 LED

FIGURE 3

5-6

SMART GENERATION

CONVECTION SYSTEM

Circulation

blowers

inoperative

oven on or in

Cool Down

mode?

Yes

Are

circulating blower

indicators

lit?

Yes

Are neon

lights on interĆ

face board

lit?

Yes

current to blower

between .4 and 1 amp

per blower?

Turn oven on.

Y2 on PLC

lit?

Yes

Replace interface

board

and or ribbon cable.

Replace relay

and/or interĆ

face board.

Replace

blower.

NoIs

Replace PLC.

Done

Yes

FIGURE 4

5-7

REFERENCE TABLES

TROUBLESHOOTING

HEATING ELEMENT RESISTANCE

ELEMENT RESISTANCE

SG1236E

208 volt 1 8.22-9.09 

220 volt 1 9.20-10.17 

240 volt 1 10.95-12.10 

208 volt 3 5.48-6.06 

240 volt 3 7.30-8.06 

240/415 volt 3 + N 10.95-12.10 

220/380 volt 3 + N 9.20-10.17 

SG3240E

208 volt 3 2.95-3.27 

240 volt 3 3.94-4.35 

220/380 volt 3 + N 4.96-5.48 

230/400 volt 3 + N 5.42-5.99 



measured between L1-L2



measured between L1-L2, L2-L3 or L3-L1



measured between L1, L2 or L3 and N

PROBE RESISTANCE VS TEMPERATURE

SG2136E/G and SG3240E/G











_F _C Ohms _F _C Ohms

200 93 135.8 400 204 177.3

250 121 146.4 450 232 187.5

300 149 156.9 500 260 197.7

350 177 167.4 550 288 207.7

TABLE 3

TABLE 2

WARNING!!

Measure resistance with all element lead wires and oven power disconnected.

5-8

Blodgett SG3240E Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual