Lincoln 1556 Operators Manual

SERVICE MANUAL

(INTERNATIONAL)

IMPINGER CONVEYOR OVENS

MODEL 1100 SERIES

Lincoln Foodservice Products, Inc.

1111 North Hadley Road

Fort Wayne, Indiana USA 46804

United States of America

Phone: (800) 374-3004 • Fax: (260) 436-0735

Technical Service Hot Line

(800) 678-9511

www.lincolnfp.com

1100exportsvc REV: 11/4/08

TABLE OF CONTENTS

SEQUENCE OFOPERATIONS 1104 THRU 1106...................................................... 3-4

SEQUENCE OF OPERATIONS 1134, 1135, 1136, 1150........................................... 5-6

SEQUENCE OF OPERA TIONS 1151....................................................................... 7-8

SEQUENCE OF OPERA TIONS 1152 THRU 1158.................................................... 9-11

SCHEMATIC 1104, 1105......................................................................................... 12

SCHEMATIC 1106 ................................................................................................. 13

SCHEMATIC 1134, 1135, 1150 S/N 2011383 & BELOW.......................................... 14

SCHEMATIC 1134, 1135, S/N 201 1383 & ABOVE................................................... 15

SCHEMATIC 1150 S/N 201 1373 & ABOVE.............................................................. 16

SCHEMATIC 1 136, S/N 201 1383 & ABOVE............................................................. 17

SCHEMATIC 1 136, S/N 2021 1383 & ABOVE........................................................... 18

SCHEMATIC 1 151, S/N 201 1383 & BELOW ............................................................ 19

SCHEMATIC 1 151, S/N 201 1373 & ABOVE............................................................ 20

SCHEMATIC 1152 THRU 1158, S/N 2011383 & BELOW......................................... 21

SCHEMATIC 1152 THRU 1158, S/N 2011383 & ABOVE.......................................... 22

SCHEMATIC 1152 & 1153 S/N 2011821 & ABOVE.................................................. 23

SCHEMATIC 1154 THRU 1158, S/N 2011821 & ABOVE.......................................... 24

TROUBLE SHOOTING GUIDE, GAS OVENS 1152 THRU 1158.............................. 25-33

TROUBLE SHOOTING GUIDE, ELECTRIC OVENS 1104, 1105, 1106..................... 34-36

TROUBLE SHOOTING GUIDE, ELECTRIC OVENS 1134, 1135, 1136, 1150........... 37-40

TROUBLE SHOOTING GUIDE, ELECTRIC OVEN 1 151......................................... 41-46

REMOVAL, INSTALLATION, AND ADJUSTMENTS................................................. 47-69

GENERAL, P ARTS BREAKDOWN.......................................................................... 70

GENERAL, P ARTS BLOW UP ................................................................................. 71

CONTROL COMPARTMENT FRONT, PARTS BREAKDOWN.................................. 72

CONTROL COMPARTMENT FRONT, BLOW UP ..................................................... 73

CONTROL COMPARTMENT FRONT, 1152 THRU 1158 PARTS BREAKDOWN....... 74

CONTROL COMPARTMENT FRONT, 1152 THRU 1158 BLOW UP......................... 75

CONTROL COMPARTMENT REAR, S/N 2011383 & BELOW PARTS..................... 76

CONTROL COMPARTMENT REAR, S/N 2011383 & BELOW BLOW UP................. 77

CONTROL COMPARTMENT REAR, S/N 2011383 & ABOVE PARTS...................... 78

CONTROL COMPARTMENT REAR, S/N 2011383 & ABOVE BLOW UP................. 79

CONTROL COMPARTMENT REAR, 1152 THRU 1158, S/N 2011821 & BELOW

PARTS BREAKDOWN................................................................................ 80

CONTROL COMPARTMENT REAR, 1152 THRU 1158, S/N2011821 & BELOW

BLOW UP...................................................................................................... 81

CONTROL COMPARTMENT REAR, 1152 THRU 1158, S/N 2011821 & ABOVE

PARTS BREAKDOWN................................................................................. 82

CONTROL COMPARTMENT REAR, 1152 THRU 1158, S/N2011821 & ABOVE

BLOW UP...................................................................................................... 83

OVEN BACK ASSEMBLY PARTS BREAKDOWN.................................................... 84

OVEN BACK ASSEMBLY BLOW UP...................................................................... 85

GEARMOTOR ASSEMBLY PARTS BREAKDOWN................................................. 86

GEARMOTOR ASSEMBLY BLOW UP.................................................................... 87

CONVEYOR / DOOR P ARTS BREAKDOWN......................................................... 88

CONVEYOR / DOOR BLOW UP .............................................................................. 89

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SEQUENCE OF OPERATIONS 1104 thru 1106

MODEL 1104 ELECTRIC 380/220 VAC 50 HZ 3 PHASE MODEL 1105 ELECTRIC 415/240 VAC 50 HZ 3 PHASE MODEL 1106 ELECTRIC 240 VAC 50 HZ 1 PHASE

POWER SUPPLY Electrical power to be supplied to the oven by a five conductor service on

Models 1104 and 1105 and a three conductor service on the 1106.

MAIN FAN CIRCUIT Power is permanently supplied (through a 10A fuse) to the normally open

contact of the main fan relay, the normally open cool-down thermostat and to the normally open main fan switch. Closing the main fan switch supplies line voltage to the primary of the power transformer (The transformer steps the voltage down to 120 VAC for the control circuit). 120 VAC is supplied to the coil of the main fan relay, its normally open contacts now close, energizing the main fan motor. Closing the main fan switch also supplies 120 VAC to the cooling fan and, through a normally closed hi-limit thermostat, the time/temp display, heat and conveyor switches.

HEATER CIRCUIT Closing the Heater Switch provides power through the normally open Air

Pressure Switch through the 3 Amp Fuse, to the Temperature Control Board and to the Heater Lamp.

TEMPERATURE CONTROL Closing the Heat Switch supplies 120 VAC to the Electronic Temperature

Control. The 2.5K ohm Potentiometer is adjusted to achieve the desired temperature. The Thermocouple will provide varying millivolts to the Temperature Control. The temperature control board then supplies 120 VAC to the coil of the Contactor at intermittent intervals to maintain the desired temperature. NOTE: Units with Serial Number prior to 2000782 were equipped with a Fenwall Temperature Control and used a Temperature Control Potentiometer rated at 5K ohms.

CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 VAC to the DC Motor Control

Board at terminals L1 and L2. A.C.volts are converted to DC volts and are supplied to the Conveyor Motor at terminals A+ and A-. Adjustment of the Speed Control Potentiometer (5,000 ohm, 10 turn) will change resistance at terminals P1, P2, and P3 varying the DC voltage to the Conveyor Motor. The speed of the conveyor motor will increase or decrease as the DC voltage from the board increases or decreases respectively. As the motor turns, it drives both the reducer gear box and the tach. generator. The tach. generator is a DC voltage generator which supplies a voltage to the DC Motor Control Board and is used as a reference for maintaining a constant conveyor speed.

TIME/TEMP DISPLAY The secondary output of the Transformer, is supplied to terminals 1, 2,

and 3 of the Time/Temp. Display. The secondary output of the Transformer is nominally 12. to 15 VAC with a center tap. The voltage from center tap to each leg is 1/2 the secondary voltage The speed side of the Time/Temp. Display uses a slotted disc (cemented to tach. coupling) to break the infra-red light beam of the optical encoder (mounted on gear motor) producing electrical pulses that are transmitted to the display. The display converts these pulses into a read-out of min The temperature portion of the Time/Temp Display uses a Thermistor

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The temperature portion of the Time/Temp Display uses a Thermistor Probe to sense oven temperature. The thermistor outputs a resistance proportional to the oven temperature. This resistance is then converted by the display into a temperature reading.

AUTOMATIC COOL DOWN When the oven reaches operating temperature the normally open Oven

Cool Down Thermostat closes. After the oven is switched OFF, the Ther mostat bypasses the Fan Switch, keeping the Cooling Fan and Main Fan in operation until the oven cools down to approximately 200°F (93.3°C).

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SEQUENCE OF OPERATION 1134 - 1135 - 1136 - 1150

MODEL 1134 ELECTRIC 220/380 VAC 50 HZ 3 PHASE MODEL 1135 ELECTRIC 240/415 VAC 50 HZ 3 PHASE MODEL 1136 ELECTRIC 240 VAC 50 HZ 1 PHASE MODEL 1150 ELECTRIC 220/380 VAC 50 HZ 3 PHASE

POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service on

single phase and a five conductor service on three phase.

CONTROL BOX AUTO When the temperature in the control box reaches COOL DOWN 120°F ± 3°F (48.9°C ± 1.7°C), the Cooling Fan Thermostat closes,

switching power to the Cooling Fans. The thermostat will open at 100°F ± 3°F (37.8°C ± 1.7°C) interrupting power to the Cooling Fans.

MAIN FAN CIRCUIT Power is supplied by Line 1 on Model 1136 and L2 on 1134, 1135, and

1150 to the normally open main fan relay. Power is also supplied from Line 1, through the 1 Amp Fuse to the primary of the Step Down Transformer. 120 V AC is continuously supplied from Transformer secondary to terminal number 1 of the 20 Minute Timer and through the High Limit Thermostat (normally closed) to the Main Fan Switch. Closing the Fan Switch energizes the coil of the oven start relay, its contacts close enabling the 20 minute time delay module. The 20 minute time delay module supplies 120 VAC to the oven fan relay, this normally open contact now closes supplying line voltage to the main fan motor. The cooling fans and the time/temp display transformer are also energized.

HEATING CIRCUIT Closing the Heat Switch supplies 120 volts AC through the normally open

Air Pressure Switch (closed by air pressure from the Main Fan), the 3 Amp Fuse, to terminal L1 of the Temperature Control Board, and the Heat Indicator Light.

TEMPERATURE CONTROL Closing the Heat Switch supplies 120 VAC to the Electronic Temperature

CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 VAC to the DC Motor Control

Board at terminals L1 and L2. AC volts are converted to DC volts and are

supplied to the Conveyor Motor at terminals A+ and A-. Adjustment S/N 2011383 and above of the Speed Control Potentiometer (5,000 ohm, 10 turn) REFER TO PAGE B15 will change resistance at terminals P1, P2, and P3varying the DC voltage

to the Conveyor Motor. The speed of the conveyor motor will increase or

decrease as the DC voltage from the board increases or decreases

respectively. As the motor turns, it drives both the reducergear box and

the Tach. Generator. The tach. generatoris a DC voltage generator which

supplies a voltage to the DC Motor Control Board and is used as a

reference for maintaining a constant conveyor speed.

TIME/TEMP DISPLAY The secondary output of the Display Transformer, is supplied to terminals

1, 2, and 3 of the Time/Temp. Display.The secondary output of the Trans-

former is nominally 12.5 to 15 VAC with a center tap. The voltage from

center tap to each leg is 1/2 the secondary voltage.

The speed side of the Time/Temp. Display uses a slotted disc

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S/N 2011383 and above (cemented to tach. coupling) to break the infra-red light beam REFER TO PAGE B15 of the optical encoder(mounted on gear motor), producingelectri

cal pulses that are transmitted to the display. The display con verts these pulses into a read-out of minutes and seconds.

The temperature portion of the Time/Temp Display uses aTher mistor Probe to sense oven temperature. The thermistor outputs a resistance proportional to the oven temperature. This resis tance is then converted by the display into a temperature reading.

AUTOMATIC COOL DOWN When this oven is started, the time delay relay timing circuit is

enabled, permitting the oven fans to run for approximately 20 minutes after the oven is shut off, to cool the oven. The Time Delay Relay will keep the coil of Relay closed, maintaining opera tion of the Main Fan Motor and the cooling fans

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SEQUENCE OF OPERATIONS - 1151

MODEL 1151 ELECTRIC 200 VAC 60 HZ 3 PHASE

POWER SUPPLY Electrical power to be supplied to the oven by a four conductor service.

CONTROL BOX AUTO When the temperature in the control box reaches COOL DOWN 120°F ± 3°F (48.9°C ± 1.7°C), the Cooling Fan

Thermostat closes, switching power to the Cooling Fans. The thermostat

will open at 100°F ± 3°F(37.8°C ± 1.7°C) interrupting power to Cooling

Fans.

MAIN FAN CIRCUIT Power is permanently supplied through a 1A fuse to the primary of the

step-down transformer. The transformer steps the voltage down to 120

VAC for the control circuit. 120 VAC is supplied to terminal #1 of the 20

minute time delay relay, through the normally closed hi-limit thermostat, to

a normally open contact of the oven start relay, the cooling fan thermostat

and to the normally open main fan switch.

Closing the fan switch energizes the oven start relay. These normally open

contacts now close enabling the 20 minute timer delay. The 20 minute

time delay relay supplies 120 VAC to the coil of the oven fan relay, these

normally open contacts now close supplying 200 VAC to the main fan

motor. The cooling fans, time/temp display, conveyor switch and heat

switch are also energized.

HEATER CIRCUIT Closing the Heater Switch supplies 120 VAC through the normally open

Air Pressure Switch (which was closed by Main Fan Air Pressure), through

the 3 Amp Fuse, to the Temperature Control Board and to the Heater

Lamp.

TEMPERATURE CONTROL Closing the Heat Switch supplies 120 VAC to the Electronic Temperature

Control. The 2.5K ohm Potentiometer is adjusted to achieve the desired

temperature. The Thermocouple will provide varying millivolts to the

Temperature Control. The temperature control board then supplies 120

VAC to the coil of the Contactor at intermittent intervals to maintain the

desired temperature.

CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 VAC to the DC Motor Control

Board at terminals L1 and L2. AC volts are converted to DC volts and are

varying the DC voltage to the Conveyor Motor. Thespeed of the conveyor

motor will increase or decrease as the DC voltage from the board in-

creases or decreases respectively. As the motor turns, it drives both the

reducergear box and the Tach. Generator. The tach. generatoris a DC

voltage generator which supplies a voltage to the DC Motor Control Board

and is used as a reference formaintaining a constant conveyor speed.

TIME/TEMP DISPLAY The secondary output of the Display Transformer, is supplied to terminals

1, 2, and 3 of the Time/Temp. Display. The secondary output of Trans-

former is nominally 12.5 to 15 VAC with a center tap. The voltage from

center tap to each leg is 1/2 the secondary voltage.

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The speed side of the Time/Temp. Display uses a slotted disc

(cemented to tach. coupling) to break the infra-red light beam 2011383 and above of the optical encoder(mounted on gear motor), Refer to Page B15 producing electrical pulses that are transmitted to the display. The display

converts these pulses into a read-out of minutes and seconds. The

temperature portion of the Time/Temp Display uses a Thermistor Probe to

sense oven temperature. The thermistor outputs a resistance proportional

to the oven temperature. This resistance is then converted by the display

into a temperature reading.

AUTOMATIC COOL DOWN When this oven is started, the time delay relay timing circuit is enabled,

permitting the oven fans to run for approximately 20 minutes after the oven

is shut off, to cool the oven. The Time Delay Relay will keep the coil of

Relay closed maintaining operation of the Main Fan Motor and cooling

fans.

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SEQUENCE OF OPERATIONS 1152 thru 1158

MODEL 1152 NAT.GAS 220 VAC 50 HZ 1 PHASE MODEL 1153 L.P. GAS 220 VAC 50 HZ 1 PHASE MODEL 1154 NAT. GAS 240 VAC 50 HZ 1 PHASE MODEL 1155 L.P. GAS 240 VAC 50 HZ 1 PHASE MODEL 1156 TOWN.GAS 220/240 VAC 50 HZ 1 PHASE MODEL 1157 NAT. GAS 220/240 VAC 50 HZ 1 PHASE MODEL 1158 L.P. GAS 220/240 VAC 50 HZ 1 PHASE

POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service.

CONTROL BOX AUTO COOL DOWN When the temperature in the Control Box reaches

120°F ± 3°F (48.9°C ± 1.7°C), the Cooling Fan Thermostat will switch

power to the Control Box Cooling Fans. The Thermostat will interrupt

power to the Cooling Fans when ‘the control box temperature falls to

100°F ± 3°F (37.8°C ± 1.7°C).

MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the oven

fan relay, the normally open cooling fan thermostat, and to the normally

open oven fan switch. Closing the fan switch supplies line voltage,

through a 1A fuse, to the primary of the power transformer (the trans-

former steps the voltage down to 120 VAC for the control circuit.) 120

VAC is supplied to the cooling fans, terminal #1 of the time delay relay and

to the coil of the oven start relay. These normally open contacts close

enabling the 20 minute time delay relay. The 20 minute time delay relay

supplies 120 VAC to the oven fan relay, its normally open contacts now

close, supplying line voltage to the main fan motor.

BURNER CIRCUIT Closing the Fan Switch supplies line voltage through the 3 amp fuse, and

oven start relay (closed by activating the Relay in the main fan circuit).

Closing the Burner Switch allows voltage to be supplied through the

normally open gas pressure switch(located in gas valve and closed

when proper gas pressure is present), through the normally open Air

Pressure Switch (closed by air pressure from main fan), through the

normally closed oven cavity high limit thermostat (opens at 662°F (350°C)

which is manually resetting after a 18°F(10°C) drop), and to the ignition

control.

IGNITION CONTROL The Ignition Control switches (220 or 240 VAC) to the combustion Blower

Motor, the normally open combustion Air Switch closes upon sensing air

pressure in the burner housing. After a pre-purge period of between 30

and 60 seconds, the Spark Generator is energized, the Main Gas Valve

Solenoid Valve and Burner Pilot Light are energized, and ignition should

now occur.

When the burner ignition occurs, the Flame Sensor must provide micro

amps (normally

system will shut down and the buzzer alarm will sound. To recycle the

burner, switch off the burner switch (this will disable the buzzer), wait 30

seconds, push IN the reset button for the ignition control, and turn on the

Burner Switch. The burner sequence of events should now reoccur.

TEMPERATURE CONTROL Closing the Fan Switch supplies 120 VAC to the Electronic Temperature

Control. The 2.5K ohm Temperature Potentiometer is

2-4 ) to the Ignition Control within 1 second or the burner

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adjusted to desired temperature. The Thermocouple will provide varying

millivolts to the Electronic Temperature Controller. The electronic tempera-

ture controller supplies 120 VAC to the Solenoid Valve at intermittent

intervals to maintain desired temperature. CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 VAC to the

D.C. Motor Control Board at terminals L1 and L2. AC volts are converted

to DC volts and are supplied to the Conveyor Motor at terminals A+ and A-

. Adjustment of the Speed Control S/N 2011821 and above Potentiometer (5,000 ohm, 10 turn) will change resistance at Refer to Page B15 terminals P1, P2, and P3 varying the DC voltage to the ConveyorMotor.

The speed of the conveyor motor will increase or decreaseas the

DC voltage from the board increases or decreases respectively. As the

motor turns, it drives both the reducer gear box and the Tach. Generator.

The tach. generator is a DC voltage generator which supplies a voltage to

the DC Motor Control Board and is used as a reference for maintaining a

constant conveyor speed.

TIME/TEMP DISPLAY The secondary output of the Display Transformer, is supplied to terminals

1, 2, and 3 of the Time/Temp. Display. The secondary output of Trans-

former is nominally 12.5 to 15 VAC with a center tap. The voltage from

center tap to each leg is 1/2 the secondary voltage. S/N 2011821 and above Refer to Page B15 The speed side of the Time/Temp. Display uses a slotted disc (cemented

to tach. coupling) to break the infra-red light beam of the optical encoder

(mounted on gear motor), producing electrical pulses that are transmitted

to the display. The display converts these pulses into a read-out of

minutes and seconds.

The temperature portion of the Time/Temp Display uses a Thermistor

Probe to sense oven temperature. The thermistor outputs a resistance

proportional to the oven temperature. This resistance is then converted by

the display into a temperature reading.

AUTOMATIC COOL DOWN When this oven is started, the time delay relay timing circuit is enabled,

permitting the oven fan to run for approximately 20 minutes after the oven

is shut off, to cool the oven. The Time Delay Relay will keep the coil of

Main Fan Relay closed, maintaining operation of the Main Fan Motor and

cooling fans.

CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 VAC, through a 3 Amp Fuse,

to the primary of the Conveyor Control Transformer. The secondary of this

Transformer supplies 10 VAC and 29 VAC to the Conveyor Control. The

Conveyor Control supplies voltage pulses to the Conveyor Motor. The

Conveyor Control Potentiometer varies the frequency of these pulses. The

motor speed will increase or decrease, as the frequency of the pulses

increase or decrease respectively.

TIME/TEMP DISPLAY Closing the Main Fan Switch supplies 120 VAC to the primary (STEPPER MOTOR DRIVE) of the Time/Temp Transformer. The secondary output of the Trans

former, 12.5 to 15 VAC with a center tap, is supplied to terminals 1, 2,

and 3 of the Time/Temp Display. The Display works on a balanced input,

and center tap voltage to each leg must be 1/2 the total reading.

The speed side of the Time/Temp Display is supplied by the Conveyor

Control, with the frequency of the pulses to the Conveyor Motor. This

frequency is converted by the Time/Temp Display into a read out of

minutes and seconds.

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NOTE: The Conveyor Control uses a sensor and magnet, mounted on the

Conveyor Motor that senses when the motor is not turning. If the motor is

not turning, the Time/Temp Display will show “—:— “ in the window.

The temperature portion of the display uses a Thermistor Probe to sense

oven temperature. The Thermistor outputs a resistance proportional to

oven temperature. This resistance is then converted by the Display into a

temperature reading.

OR:

The temperature potion of the display uses a “J” type thermocouple to

measure oven temperature. The thermocouple generates D.C. millivolts

proportional to oven temperature. This millivolt reading is then converted

by the display into a temperature reading.

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SCHEMATIC 1104-1105

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SCHEMATIC 1106

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SCHEMATIC 1134, 1135, 1150, S/N 2011383 AND BELOW

Impinger II - 1100 Series Service Manual - International

SCHEMATIC 1134, 1135 S/N 2011383 AND ABOVE

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SCHEMATIC 1150 S/N 2011383 AND ABOVE

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SCHEMATIC 1136, S/N 2011383 AND BELOW

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SCHEMATIC 1136, S/N 2011383 AND ABOVE

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SCHEMATIC 1151 S/N 2011383 AND BELOW

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SCHEMATIC 1151 S/N 2011383 AND ABOVE

Impinger II - 1100 Series Service Manual - International

SCHEMATIC1152 THRU 1158 S/N 2011383 AND BELOW

Impinger II - 1100 Series Service Manual - International

SCHEMATIC1152 THRU 1158 S/N 2011383 AND ABOVE

Impinger II - 1100 Series Service Manual - International

SCHEMATIC1152 AND 1153 S/N 2011821 AND ABOVE

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SCHEMATIC 1154 THRU 1158 S/N 2011821 AND ABOVE

Impinger II - 1100 Series Service Manual - International

TROUBLE SHOOTING GUIDE

GAS OVENS

MODELS 1152 - 1153 - 1154 - 1155 - 1156 - 1157 - 1158

REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS

SYMPTOM POSSIBLE CAUSE EVALUATION

Oven fan will not run Incoming Power Supply Check circuit breakers, reset if

required, call power company if needed.

Main Fan Switch Check continuity between switch

terminals. Control Box High Limit Terminals are normally closed, and Thermostat open at 170°F ± 5F (76.6°C ± 2.8°C). NOTE: Discontinued at Check for over heating and reset S/N 2011821 thermostat. Test for proper

operation. If it will not reset and hold, re-

place thermostat. Fuse, 1 Amp Check, replace if necessary. Fuseholder Check, replace if necessary. Transformer,Step Down 120 VAC ± 10% should be present at

secondary of transformer. If proper

voltage is not present, check

transformer primary for proper

input. Replace as needed. Oven Start Relay Check for 120 VAC to relay coil. If

voltage is not present, trace wiring

back to power source. If voltage is

present, check to insure contact

is closing. 20 Minute Time Delay Check for 120 VAC at terminal #1 to

neutral on 20 minute Time Delay

Relay. If no voltage is present, trace

wiring back to power source.

If voltage is present at terminal #1,

check for 120 VAC at terminal #2 to

neutral. If no voltage is present, and

cool down relay contact is closed,

replace Time Delay Relay. Main Fan Relay Check for 120 VAC to coil of the Relay

if no voltage is present, trace wiring

back to 20 minute Time Delay Relay.

If voltage is present, check to insure

contacts are closing. Fuse, 10 Amp Check, replace if necessary. Fuseholder Check, replace if necessary. Motor Capacitor Check for opens, shorts, or grounds. Main Fan Motor Check for supply voltage to main fan

motor. If voltage is not present, trace

wiring back to main fan relay. Check for

opens, shorts, or grounds.

WITH POWER OFF: turn fan blade to

check for locked rotor.

Impinger II - 1100 Series Service Manual - International

No main fan cool down 20 Minute Time Delay Check for 120 VAC at pin#2 and #3

Relay while main fan is running. Turn off

main fan switch and 120 VAC should

continue to be present for 20 minutes. Main Fan Relay Check if relay is operating and

terminals are remaining closed for

main fan cool down of 20 minutes.

Main fan runs after NOTE: The time delay relay will 20 minute cool down keep the coil of the main fan relay

closed, maintaining main fan operation for

cool down for approximately 20 minutes. Cool Down Relay Contacts of the relay should

open when main fan is switched off. Time Delay 120 VAC at terminal 2 should

discontinue approximately 20 minutes after main

fan is switched off. If cool down relay is open and

voltage continues at terminal 2,

replace time delay. Main Fan Relay When voltage at terminal 2 of time

delay ceases, main fan relay must open.

No control box cooling Incoming Power Check main circuit breakers, reset if

required, call power company if

needed. Main Fan Switch Check continuity between switch

terminals. Control Box High Limit Terminals are normally closed, and Thermostat open at 170°F ± 5°F (76.6°C ± 2.8°C). Note: Discontinued at Check for over heating and reset S/N 2011821 thermostat. Test for proper operation.

If it will not reset and hold, replace. Fuse, 1 Amp Check, replace if necessary. Fuseholder Check, replace if necessary. Step Down Transformer 120 VAC should be present on

secondary. Replace as needed. Cooling Fans 120 VAC should now be at these fan

motors. If voltage is present, check

motors for shorts or opens.

WITH POWER OFF: Check for locked rotor.

No automatic control Incoming Power Supply Check circuit breakers, reset if box cooling required, call power company if needed

Cooling Fan Thermostat Thermostat is normally

open and closes at 120°F ± 3 (48.9°C ± 1.7°),

and opens at 100°F ± 3°F

(37.8°C ± 1.7°C). Control Box Hi Limit Terminals are normally closed, but Discontinued at S/N open at 170°C ± 5°F (76.6°C ± 2.8°C). 2011821 Check for over heating and reset

thermostat. Test for proper operation.

If it will not reset and hold, then

replace. Fuse, 1 Amp Check, replace if necessary. Fuseholder Check, replace if necessary. Step Down Transformer 120 VAC ± 10% should be present at

secondary of transformer. If proper

voltage is not present, check

transformer primary for proper

input. Replace as needed.

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Cooling Fans 120 VAC should now be at these fan

motors. If voltage is present,

check motors for shorts or opens.

WITH POWER OFF: Check for locked rotor.

Cooling fans continue Cooling Fan Thermostat Thermostat is normally open and may to run after 20 minute have closed if control box temperature cool down

is 120°F or above.

Oven will not heat Gas Supply Check for adequate gas supply and

manual gas shut off valve is open.

Also, check flexible gas line connection. Main Fan If not operating, refer to “Oven Fan

Will Not Run” on Page C6. Fuse 3 Amp Check, replace if necessary. Fuseholder Check, replace if necessary. Relay Oven Start Supply voltage should be present

across these terminals. Burner Switch Check for supply voltage on both sides of

switch. If switch is closed and voltage

present on one side only, replace switch. Gas Pressure Switch This switch is located inside the gas

valve and should close when gas

pressure is present.

WITH POWER OFF: remove 3 prong plug

(on gas valve) and measure continuity between

terminals 2 and 3.

NOTE: Remove insulation pad below plug to

read numbers. If no continuity, check the

following:

Proper gas pressure supply to gas valve as

marked on the oven specification plate.

Check for proper adjustment of gas

pressure switch 8.8 on dial for

natural gas, 23 for LP, and

4.5 for Town Gas.

Check gas filter in gas valve for

blockage or damage. (See Adjustment

section for location)

If above checks are okay, but pressure

switch is still not closed, replace gas

valve. Air Pressure Check air switch terminals for supply voltage Switch at NO 2 and COM. If voltage is present on one

side only, check for air tube blockage or

misalignment. If these are okay, adjust

switch or replace necessary. (Oven Cavity) High Limit Terminals are normally closed, Thermostat

opens at 660°F (350°C). If

open, push in reset button and retest.

If thermostat will not hold for

maximum oven temperature, and oven

is not exceeding temperature dial

setting, check for proper location of

capillary bulb in its spring holder.

If above check okay, replace hi-limit

thermostat. Ignition Control Check for proper supply voltage

to ignition control.

Impinger II - 1100 Series Service Manual - International

Check for proper line voltage to

the Burner Blower Motor. This

can be checked at motor connecting

plug terminal 2 and 5. If voltage is

present proceed with next step, if not,

wait 30 seconds, push reset button,

and try to restart. If this fails, check

wires from Thermostat and Burner

Blower Motor to the Ignition Control.

If all above fails and wires are okay,

replace ignition control. Burner Blower Motor Check for supply voltage to motor.

WITH POWER OFF: turn blower wheel

to check for locked rotor.

If proper supply voltage is present at

motor connecting plug, terminal 2

and 5 and motor does not run, replace motor Air Pressure Check for proper supply voltage Switch switching from “N.C.” to “N.O.” as air (Burner Blower) pressure switch closes.

If above fails, connect a temporary

jumper wire (FOR TESTING ONLY)

from terminal “C” to terminal “N.O.”

on ignition control (bypasses air

switch). NOTE: For Honeywell

control only.

Check for air switch adjustment,

air tube blockage, or misalignment,

and if these fail,replace air pressure switch Spark Generator A pre-purge-time of 30 to 60 seconds

occurs after blower motor starts, check for supply

voltage atspark generator.

If voltage is not present, check reset

button for the Ignition Control.

If voltage is still not present, replace

ignition control.

If voltage is present, visually check

for spark at ignitor head located in

burner. Ignitor/Sensor Assembly Check this assembly for visible

damage. If there is no damage, replace

the Spark Generator. If there is

damage, replace the Ignitor/Sensor

Assembly. Also check for frayed or

damaged wires in the burner tube. Gas Valve Gas valve should open when

proper supply voltage is present.

If no voltage is present, check the

reset button on the ignition

control, and all connections for

tightness. If there is still no

voltage present at gas valve, replace ignition

control.If there is voltage present, check for

gas pressure at the gas pressure tap

located in the gas piping just prior to

the burner. If there is no gas pressure, replace

gas valve

Impinger II - 1100 Series Service Manual - International28

+ 64 hidden pages