Lincoln 1156 Operators Manual

SERVICE MANUAL
(INTERNATIONAL)
IMPINGER CONVEYOR OVENS
MODEL 1100 SERIES
Lincoln Foodservice Products, Inc.
1 1 1 1 North Hadley Road
Fort Wayne, Indiana USA 46804
Phone: (800) 374-3004 • Fax: (260) 436-0735
T echnical Service Hot Line
(800) 678-9511
www.lincolnf p.com
1 100export svc REV: 1 1/4/08
T ABLE OF CONTENTS
SEQUENCE OFOPERATIONS 1104 THRU 1106...................................................... 3-4
SEQUENCE OF OPERATIONS 1134, 1135, 1136, 1150........................................... 5-6
SEQUENCE OF OPERATIONS 1151....................................................................... 7-8
SEQUENCE OF OPERATIONS 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 2011383 & ABOVE................................................... 15
SCHEMATIC 1150 S/N 2011373 & ABOVE.............................................................. 16
SCHEMATIC 1136, S/N 2011383 & ABOVE............................................................. 17
SCHEMATIC 1136, S/N 20211383 & ABOVE........................................................... 18
SCHEMATIC 1151, S/N 2011383 & BELOW............................................................ 19
SCHEMATIC 1151, S/N 2011373 & 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 1151......................................... 41-46
REMOVAL, INSTALLATION, AND ADJUSTMENTS................................................. 47-69
GENERAL, PARTS BREAKDOWN.......................................................................... 70
GENERAL, PARTS BLOW UP................................................................................. 71
CONTROL COMPARTMENT FRONT, PARTS BREAKDOWN.................................. 72
CONTROL COMPARTMENT FRONT, BLOW UP..................................................... 73
CONTROL COMPARTMENT FRONT, 1152 THRU 1158 P AR TS 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, 1 152 THRU 1158, S/N 2011821 & BELOW
PARTS BREAKDOWN................................................................................ 80
CONTROL COMPARTMENT REAR, 1152 THRU 1158, S/N2011821 & BELOW
BLOW UP...................................................................................................... 81
CONTROL COMPARTMENT REAR, 1 152 THRU 1158, S/N 201 1821 & ABOVE
PARTS BREAKDOWN................................................................................. 82
CONTROL COMPARTMENT REAR, 1 152 THRU 1158, S/N201 1821 & 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 PARTS 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 SUPPL Y 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 1 106.
MAIN F AN 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 V AC for the control circuit). 120 VAC is supplied to the coil of the main fan relay , its normally open contact s now close, energizing the main fan motor. Closing the main fan switch also supplies 120 V AC to the cooling fan and, through a normally closed hi-limit thermo­stat, the time/temp display , heat and conveyor switches.
HEA TER 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.
TEMPERA TURE CONTROL Closing the Heat Switch supplies 120 V AC 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 T emperature Control. The temperature control board then supplies 120 V AC to the coil of the Contactor at intermittent intervals to maint ain the desired temperature. NOTE: Units with Serial Number prior to 2000782 were equipped with a Fenwall Temperature Control and used a T emperature 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 T ransformer is nominally 12. to 15 V AC with a center t ap. 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.
AUTOMA TIC 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 AUT O 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
1 150 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 T ransformer 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 cont acts close enabling the 20 minute time delay module. The 20 minute time delay module supplies 120 V AC 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.
HEA TING 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.
TEMPERA TURE CONTROL Closing the Heat Switch supplies 120 V AC 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 T emperature Control. The temperature control board then supplies 120 V AC to the coil of the Contactor at intermittent intervals to maint ain 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
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 T ach. 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 DISPLA Y 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 T rans-
former is nominally 12.5 to 15 V AC 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 a Ther 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.
AUTOMA TIC 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 T ime 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 SUPPL Y Electrical power to be supplied to the oven by a four conductor service. CONTROL BOX AUT O 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 F AN 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 V AC 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 V AC to the coil of the oven fan relay , these normally open contacts now close supplying 200 V AC to the main fan motor. The cooling fans, time/temp display , conveyor switch and heat switch are also energized.
HEA TER CIRCUIT Closing the Heater Switch supplies 120 V AC 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.
TEMPERA TURE CONTROL Closing the Heat Switch supplies 120 V AC 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 T emperature Control. The temperature control board then supplies 120 V AC to the coil of the Contactor at intermittent intervals to maint ain 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
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 P3
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 DISPLA Y The secondary output of the Display Transformer , is supplied to terminals
1, 2, and 3 of the Time/Temp. Display . The secondary output of T rans-
former is nominally 12.5 to 15 V AC 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 201 1383 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. AUTOMA TIC 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 T ime 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 SUPPL Y 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 F AN 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 V AC for the control circuit.) 120
V AC 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 contact s close
enabling the 20 minute time delay relay . The 20 minute time delay relay
supplies 120 V AC 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 V AC) 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 V alve 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 of f 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 . TEMPERA TURE CONTROL Closing the Fan Switch supplies 120 V AC 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 V AC to the Solenoid V alve at intermittent
intervals to maintain desired temperature. CONVEYOR DRIVE Closing the Conveyor Switch supplies 120 V AC 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 Conveyor Motor.
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 DISPLA Y The secondary output of the Display Transformer , is supplied to terminals
1, 2, and 3 of the Time/Temp. Display . The secondary output of T rans-
former is nominally 12.5 to 15 V AC with a center tap. The voltage from
center tap to each leg is 1/2 the secondary voltage. S/N 201 1821 and above Refer to Page B15 The speed side of the Time/T emp. 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. AUTOMA TIC 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 T ime 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 V AC, through a 3 Amp Fuse,
to the primary of the Conveyor Control Transformer . The secondary of this
Transformer supplies 10 V AC 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 T rans
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
14
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SCHEMATIC 1134, 1135 S/N 2011383 AND ABOVE
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SCHEMATIC 1150 S/N 2011383 AND ABOVE
16
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SCHEMATIC 1136, S/N 2011383 AND BELOW
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SCHEMATIC 1136, S/N 2011383 AND ABOVE
18
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SCHEMATIC 1151 S/N 2011383 AND BELOW
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SCHEMATIC 1151 S/N 2011383 AND ABOVE
20
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SCHEMATIC1152 THRU 1158 S/N 2011383 AND BELOW
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SCHEMATIC1152 THRU 1158 S/N 2011383 AND ABOVE
22
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SCHEMA TIC1 152 AND 1 153 S/N 2011821 AND ABOVE
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SCHEMATIC 1154 THRU 1158 S/N 2011821 AND ABOVE
24
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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 T erminals 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 V AC ± 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 V AC 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 V AC 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 V AC 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 V AC 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.
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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 V AC 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 T erminals 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 T ransformer 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 T erminals 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 T erminals 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 - 1 100 Series Service Manual - International
27
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 ONL Y)
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 V alve 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
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