Lincoln 1132 User Manual
SERVICE MANUAL
(DOMESTIC)
IMPINGER CONVEYOR OVENS
MODEL 1100 SERIES
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
United States of America
Phone : (260) 459-8200
U.S. Fax: (888) 790-8193 • Int’l Fax: (260) 436-0735
Technical Service Hot Line
(800) 678-9511
www.lincolnfp.com
1100svcdom REV 11/4/08
TABLE OF CONTENTS
SEQUENCE OF OPERATIONS 1100 thru 1103 .....................................................................................................3
SEQUENCE OF OPERATIONS 1116 - 1117 ..........................................................................................................4
SEQUENCE OF OPERATIONS 1130 - 1133 & 1160 - 1163................................................................................... 6
SCHEMATIC 1100 – 1101 .......................................................................................................................................8
SCHEMATIC 1102-1103 ..........................................................................................................................................9
SCHEMATIC 1116 – 1117 S/N 2011383 & BELOW.............................................................................................. 10
SCHEMATIC 1116 – 1117 S/N 2011384 & ABOVE ..............................................................................................11
SCHEMATIC 1130 – 1131 S/N 2011383 & BELOW & 1160 – 1161 S/N 2011978 & BELOW..............................12
SCHEMATIC 1130 – 1131 S/N 2011384 & ABOVE ..............................................................................................13
SCHEMATIC 1160 – 1161 S/N 2011978 & ABOVE ..............................................................................................14
SCHEMATIC 1132 – 1133 S/N 2011383 & BELOW & 1162 – 1163 S/N 2011979 & BELOW..............................15
SCHEMATIC 1132 – 1133 S/N 2011384 & ABOVE ..............................................................................................16
SCHEMATIC 1162 – 1163 S/N 2011978 & ABOVE ..............................................................................................17
TROUBLESHOOTING GUIDE 1116 - 1117........................................................................................................... 18
TROUBLESHOOTING GUIDE 1100 THRU 1103..................................................................................................22
TROUBLESHOOTING GUIDE 1130 THRU 1133 / 1160 THRU 1163................................................................... 24
REMOVAL, INSTALLATION, AND ADJUSTMENT ...............................................................................................31
PARTS / GENERAL –1100 SERIES ......................................................................................................................50
BLOW UP / GENERAL – 1100 SERIES.................................................................................................................51
PARTS / CONTROL COMPARTMENT FRONT 1100 - 1106, 1130 - 1136, 1150,1151,1160 – 1163 ..................52
BLOW UP / CONTROL COMPARTMENT FRONT 1100 – 1106,1130 – 1136, 1150,1151,1160 – 1163 ............. 53
PARTS / CONTROL. COMPARTMENT FRONT 1116,1117 .................................................................................54
BLOW UP / CONTROL COMPARTMENT FRONT 1116, 1117............................................................................. 55
PARTS / CONTROL COMPARTMENT REAR 1100 – 1106, 1130 – 1136, 1150,1151, S/N 2011373 & BELOW, 1160
– 1163 S/N 2011978 & BELOW .............................................................................................................................56
BLOW UP / CONTROL COMPARTMENT REAR 1100 – 1106, 1130 – 1136, 1150,1151, S/N 2011373 & BELOW,
1160 – 1163 S/N 2011978 & BELOW ....................................................................................................................57
PARTS / CONTROL COMPARTMENT REAR 1130 - 1136, 1150, 1151, S/N2011383 AND ABOVE, 1160 – 1163 S/N
3011978 AND ABOVE............................................................................................................................................ 58
BLOW UP / CONTROL COMPARTMENT REAR 1130 - 113
S/N 3011978 AND ABOVE.....................................................................................................................................59
PARTS / CONTROL COMPARTMENT REAR 1116, 1117, S/N 2000200 TO 2011383 .......................................60
BLOW UP / CONTROL COMPARTMENT REAR 1116, 1117, S/N 2000200 TO 2011383................................... 61
PARTS / CONTROL COMPARTMENT REAR 1116, 1117 S/N 2011383 & ABOVE ............................................62
BLOW UP / CONTROL COMPARTMENT REAR 1116, 1117 S/N 2011383 & ABOVE ........................................ 63
PARTS / OVEN BACK ASSEMBLY 1100 SERIES................................................................................................64
BLOW UP / OVEN BACK ASSEMBLY 1100 SERIES ...........................................................................................65
PARTS / GEARMOTOR ASSEMBLY 1100 SERIES .............................................................................................66
BLOW UP / GEARMOTOR ASSEMBLY 1100 SERIES.........................................................................................67
PARTS / CONVEYOR & DOOR 1100 SERIES .....................................................................................................68
BLOW UP / CONVEYOR & DOOR 1100 SERIES................................................................................................. 69
6, 1150, 1151, S/N2011383 AND ABOVE, 1160 – 1163
2
Impinger II –1100 Series Service Manual - Domestic
SEQUENCE OF OPERATIONS 1100 THRU 1103
MODEL 1100 / ELECTRIC / 120/208 VAC / 60 HZ / 1 PHASE
MODEL 1101 / ELECTRIC / 120/240 VAC / 60 HZ / 1 PHASE
MODEL 1102 / ELECTRIC / 120/208 VAC / 60 HZ / 3 PHASE
MODEL 1103 / ELECTRIC / 120/240 VAC / 60 HZ / 3 PHASE
POWER SUPPLY Electrical Power to be supplied to the oven by a four conductor cord set on single
phase and a five conductor cord set on three phase.
Voltage from the black conductor to the white conductor is120 VAC.
Black conductor is Hot.
Red conductor is Hot.
Orange conductor is Hot. (Used on 3Ø only)
White conductor is dedicated neutral.
Green conductor is ground.
MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the main fan
relay, through a 10A fuse, to the normally open cool down thermostat, and to the
normally open main fan switch. Closing the main fan switch energizes the coil of
the main fan relay. Its normally open contacts now close energizing the main fan
motor. Closing the main fan switch energizes the cooling fan, the time/temp
transformer, the 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 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 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 which 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
12.5 to 15 VAC with a center tap. The voltage from the 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
minutes and seconds. The temperature portion of the Time/Temp Display
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 oven is switched OFF, the Thermostat bypasses
the Fan Switch , keeping the Cooling Fan and Main Fan operating until the oven
cools down to approximately 200°F (93.3°C).
Impinger II –1100 Series Service Manual - Domestic
3
SEQUENCE OF OPERATIONS 1116 - 1117
MODEL 1116 / NATURAL GAS / 120 VAC / 60 HZ / 1 PHASE
MODEL 1117 / L.P GAS / 120 VAC / 60 HZ / 1 PHASE
POWER SUPPLY
CONTROL BOX AUTO When the temperature in the control box reaches 120°F ± COOL DOWN 3°(48.9°C
MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the oven fan relay,
BURNER CIRCUIT Closing the Burner Switch supplies 120 VAC thro ugh the 1 0 Amp Fu se, through
IGNITION CONTROL The Ignition Control operates on both 24 VAC and 120 VAC. When the control is
TEMPERATURE CONTROL When the Ce ntrifigual Switch of the Bu rner Blower Motor closes, power is applied
CONVEYOR DRIVE Closing the Fan S witch and the Conveyor Switch, supplies 120 VAC through 3
TIME/TEMP DISPLAY The secondary output of the Transformer, is supplied to terminals 1, 2, and 3 of the
Electrical power is supplied to the oven by a three conductor cord set. Voltage from
the bla ck conductor t o th e white conductor is 120 VAC. Th e white cond uctor i s
neutral. The green conductor is ground.
± 1.7°C), the Cooling Fan Thermostat will switch power to the Control Box Cooli ng
Fans. T he thermostat will interru pt p ower to the fans when t he control box
temperature falls to100°F ± 3° (37.8°C ± 1.7°C).
the normally open cooling fan thermostat, terminal #1 of the time delay relay and
the no rmally open main fa n switch. Closing the mai n fan switch enables the 20
minutes time delay relay. The time delay relay supplies 120 VAC to the coil of the
main fan rela y. These normally open contac ts now close energizing the main fan
motor and th e coolin g fan s. Cl osing th e fan switch also en ergizes the time/te mp
display, the heat and conveyor switches.
the Main F an Motor Centrifugal Switch, and oven cavity High Limit Thermostat to
terminal L1 of the Ignition Control. The Centrifugal Switch of the Main Fan Mo tor
closes when the fan motor reaches 1600 RPM. The High Limit Thermostat opens
at 662°F (350°C) and m ay be man ually reset after the se nsing b ulb tempe rature
drops 18°F(10°C).Power (120 VAC) i s also supplied to the Burner Blowe r Motor.
As this moto r rea ches a pproximately 1600 RPM, i ts Intern al Centrifugal Switch
closes, suppl ying 12 0 VA C th rough th e no rmally cl osed Control Box Hi gh Li mit
Thermostat, to the prima ry of the 24 VAC Tran sformer and t he Temp erature
Control. The Control Box High Limit Thermostat is manually re-settable and opens
when the co ntrol box re aches 17 0°F ± 5°(76°C ± 3° C). (Discontinue d at S/N
2011383)
energized by 24 VAC fro m the Tra nsformer, 120 V AC is switched by the Ign ition
Control to the Hot Surfac e Ignitor for 45 seconds for Hot Surface Ignitor warm up.
The Ig nitor g lows red, 24 VAC i s switched to the gas valve which op ens, and
ignition should now occur. If ignition do es not occur in 6 second s, the co ntrol will
lock out. To recycle after lock out, turn off the bu rner switch fo r 4 5 second s and
then turn the switch back on.
to the Temperature Control. The 2.5K ohm Temperature Pot is adjusted to desired
temperature. The Thermocouple will provide varying millivolts to the Tem perature
Controller. The Temperature Controller supplies 120 VAC to the Solenoid Valve at
intermittent intervals to maintain desired temperature.
Amp Fuse to L1and L2 of the Motor Control Board. AC volts are converted to DC
by the Control Board and are supplied to the Motor from Board terminals A+ and A. Adjustment of the Spe ed Cont rol Pot (5,000 o hm 10 turn pot) will ch ange
resistance at terminal s P1 , P2, and P3 varying S/N 2011 383 and above th e DC
voltage to th e motor. T he sp eed of t he Conveyor Motor Refer to page 26 will
increase o r d ecrease a s t he DC voltag e from the board i ncreases o r de creases
respectively. As the motor turns, it drives both the Reducer Ge ar Box and the
Tach. Generator. The Tach. Generator is a DC voltage Generator that sup plies 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 Transformer is nominally 12.5 to 15
VAC with a cente r tap. The voltag e from cent er tap to ea ch leg i s 1/ 2 the
secondary voltage.
4
Impinger II –1100 Series Service Manual - Domestic
S/N 2011383 and above The speed side of the Time/Temp. Display uses a sl otted disc Re fer to page 2 7
(cemented to tach. coupling) to b reak t he infra-re d light b eam of the optical
encoder (mounted on gear motor), producing electrical pulses that are transmitted
to the display. The displa y converts these p ulses into a read-out of minutes a nd
seconds.
The temp erature portion o f the Time/T emp Display uses a Thermistor P robe to
sense oven temperature. The thermistor 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 shutoff, to cool
the oven. The Time Delay Relay will keep the coil of the Main Fan Relay closed,
maintaining operation of main fan and Cooling Fan Motors.
Impinger II –1100 Series Service Manual - Domestic
5
SEQUENCE OF OPERATIONS 1130 - 1133 & 1160 - 1163
MODEL 1130 / ELECTRIC / 120/208 VAC / 1 PHASE
MODEL 1131 / ELECTRIC / 120/240 VAC / 1 PHASE
MODEL 1132 / ELECTRIC / 120/208 VAC / 3 PHASE
MODEL 1133 / ELECTRIC / 120/240 VAC / 3 PHASE
MODEL 1160 / ELECTRIC / 120/208 VAC / 1 PHASE
MODEL 1161 / ELECTRIC / 120/240 VAC / 1 PHASE
MODEL 1162 / ELECTRIC / 120/208 VAC / 3 PHASE
MODEL 1163 / ELECTRIC / 120/240 VAC / 3 PHASE
POWER SUPPLY Electrical Power to be supplied to the oven by a four conductor service on
single phase and a five conductor service on three phase.
Voltage from the black conductor to the white conductor is 120 VAC.
Black conductor is Hot.
Red conductor is Hot.
Orange conductor is Hot. (Used on 3Ø only)
White conductor is dedicated neutral.
Green conductor is ground.
NOTE: A 20 Amp Receptacle, NEMA STYLE L6-20, is provided on Models
1160, 1161, 1162, and 1163 for accessory plug in. Rated at 208 or 240 VAC.
CONTROL BOX AUTO COOL
DOWN
MAIN FAN CIRCUIT Electrical power is permanently supplied through a 10 amp fuse to terminal 1 of
HEATER CIRCUIT Closing the Heat Switch supplies 120 V AC through the normally open Air
TEMPERATURE CONTROL Closing the Heat Switch supplies 120 VAC to the Electronic Temperature
CONVEYOR DRIVE
(S/N 2011383 and above
Models 1130 through 1133).
S/N 2011978 and above
Models 1160 through 1163
Refer to Page 26)
TIME/TEMP DISPLAY The secondary output of the Transformer, is supplied to terminals 1, 2, and 3
6
When the temperature in the control box reaches 120°F ±3°F(48.9°F ± 1.7°C),
the Cooling Fan Thermostat will switch power to the Cooling Fans. The
thermostat will interrupt power to the fans when the temperature falls to 100°F
± 3°F(37°C ± 1.7°C).
the 20 Minute Timer, through the normally closed Hi Limit Thermostat to the fan
switch. Closing 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, these normally open contacts
now close supplying 208/240 VAC to the main fan motor. The cooling fans are
also energized. Closing the fan switch also supplies 120 VAC to the Heater
Switch/Conveyor Switch, and the display Transformer.
Pressure Switch (closed by air pressure from the Main Fan), the 3 Amp Fuse, to
L1 terminal of the Temperature Control Board, and the Heat Indicator Light.
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.
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 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 through 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.
of the Time/Temp. Display. The secondary output of Transformer 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 (S/N 2011383 and above on (cemented to tach. coupling) to
break the infra-red light beam Models 1130 through 1133 of the optical
encoder (mounted on gear motor), producing electrical pulses that are
Impinger II –1100 Series Service Manual - Domestic
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 main fan and Cooling Fan Motors.
Impinger II –1100 Series Service Manual - Domestic
7
SCHEMATIC 1100 – 1101
8
Impinger II –1100 Series Service Manual - Domestic
SCHEMATIC 1102-1103
Impinger II –1100 Series Service Manual - Domestic
9
SCHEMATIC 1116 – 1117 S/N 2011383 & BELOW
10
Impinger II –1100 Series Service Manual - Domestic
SCHEMATIC 1116 – 1117 S/N 2011384 & ABOVE
Impinger II –1100 Series Service Manual - Domestic
11
SCHEMATIC 1130 – 1131 S/N 2011383 & BELOW & 1160 – 1161 S/N 2011978 & BELOW
12
Impinger II –1100 Series Service Manual - Domestic
SCHEMATIC 1130 – 1131 S/N 2011384 & ABOVE
Impinger II –1100 Series Service Manual - Domestic
13
SCHEMATIC 1160 – 1161 S/N 2011978 & ABOVE
14
Impinger II –1100 Series Service Manual - Domestic
SCHEMATIC 1132 – 1133 S/N 2011383 & BELOW & 1162 – 1163 S/N 2011979 & BELOW
Impinger II –1100 Series Service Manual - Domestic
15
SCHEMATIC 1132 – 1133 S/N 2011384 & ABOVE
16
Impinger II –1100 Series Service Manual - Domestic
SCHEMATIC 1162 – 1163 S/N 2011978 & ABOVE
Impinger II –1100 Series Service Manual - Domestic
17
TROUBLESHOOTING GUIDE 1116 - 1117
n
r
r
GAS OVENS
MODEL 1116 / NATURAL GAS / 120VAC / 60 HZ / 1 PHASE
MODEL 1117 / L.P. GAS / 120VAC / 60 HZ / 1 PHASE
REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS
SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming Power Supply Check breakers/Reset if required Check power plug to
be sure it is firmly in receptacle. Measure incoming
power/call Power Co. if needed.
No main fan cool down
Main fan runs after 20
minute cool down
20 minute cool down
Time Delay Relay 120 VAC at terminal 2 should discontinue
No control box cooling Incoming Power Check main circuit breakers, reset if required, call powe
Main Fan Switch Check continuity between switch terminals.
20 Minute Time Delay With fan switch on, check for 120 VAC at terminal 2 of
Main Fan Relay Check continuity of 120 VAC coil. Check for power to
Cooling Fans 120 VAC should now be at the fan motors. If voltage is
Main Fan Switch Check continuity between switch terminal.
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 Main Fan Switch
is closed, replace Time Delay
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
Fuse Holder Check, replace if necessary.
Main Fan Motor Check for opens, shorts, or grounds. WITH POWER
: turn fan blade to check for locked rotor.
OFF
Capacitor Check for shorts or grounds. WARNING: Capacitor
has a stored charge, discharge before testing.
20 Minute Time Delay Relay
Main Fan Relay
Check for 120 VAC at pin #2 and #3 while main fan is
running. Turn off main fan switch and 120 VAC should
continue to be present for 20 minutes at terminal 2.
Check if relay is operating and terminals are remaining
closed for main fan cool down of 20 minutes
NOTE: The time delay relay will keep the coil of main fa
closed, maintaining main fan operation for cool down fo
approximately 20 minutes.
approximately 20 minutes after the main fan switch is
switched off. If the switch is open and voltage
continues at terminal 2, replace Time Delay. When
voltage at terminal 2 of Time Delay ceases ,the main
fan relay must open.
company if needed.
Time Delay.
the relay coil (120 VAC).
present, check motors for shorts or opens WITH
POWER OFF: Check for locked rotor.
18
Impinger II –1100 Series Service Manual - Domestic
d
Cooling fans continue to
run after 20 minute cool
Cooling Fan Thermostat Thermostat should close at 120°F± 5°F and open at
100°F± 5°F.
Main Fan Relay Check to insure that contacts of main fan relay are
opening after 20 minute cool down
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".
Heat Switch Check for continuity, replace if necessary
Fuse 10 amp Replace if necessary.
Fuseholder Replace if necessary
Centrifigual Switch of Main
Fan Motor
Check for 120 VAC at lead #47 (located at 6 pin
connector in raceway near the main fan motor) to
neutral. If no voltage is present, and motor is running,
replace motor.
(Oven Cavity) High Limit Terminals are normally closed, opens at Thermostat
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 checks okay, replace hi-
limit thermostat.
Burner Blower Motor Visually check to see if motor is running. If not, check
for 120 VAC to motor at motor connector (wire #40
and #41). If voltage is not present, trace wiring back
to oven cavity High Limit. If voltage is present and
motor is not running, check for opens, shorts, or
grounds. Also, WITH POWER OFF: check for locked
rotor.
Control Box High Limit
thermostat
NOTE: Discontinued S/N
Terminals are normally closed, and open at 170°F ±
5°F (76.6°C ± 2.8°C). Check for proper operation. If it
will not reset and hold, replace thermostat.
2011383
Centrifigual Switch of Burner
Blower Motor
Check for 120 VAC at motor connector wire #42 to
neutral. If voltage is not present, trace wiring back to
control box High Limit . If voltage is present, check #43
to neutral. If voltage is not present and motor is
running, replace the Burner Blower Motor.
Burner Transformer Primary is 120 VAC with 24 VAC secondary. If 120
VAC is not present, trace wiring back to Burner Blower
Centrifugal Switch. If 120 VAC is present, check for 24
VAC at secondary of transformer. If no voltage is
present, replace transformer.
Ignition Control Note: The ignition control contains a safety lock-out
circuit. If a flame is not detected within 6 seconds after
the gas control valve is energized, the ignition control
will lock-out. To reset, turn the burner switch "off", wait
45 seconds and switch the burner system "on" to retry
ignition. 24 volts should be present at 24 volt terminals.
If not present, trace wiring back to burner transformer.
When 24 VAC is supplied, the control switches 120
VAC from L1 and L2 to the Hot Surface Ignitor. If 120
VAC is not present at L1 and L2, trace wiring back to
oven cavity High Limit Thermostat. If 24 VAC and 120
VAC are present and 120 VAC is not across the Hot
Surface Igniter terminals, replace the ignition control
Impinger II –1100 Series Service Manual - Domestic
19
Hot Surface Igniter If 120 VAC is present at Hot Surface Igniter terminals,
visually check to see that the igniter is heating. (Igniter
may be viewed through the port glass in end of the
burner tube.) The Igniter should glow bright red. If the
igniter does not heat, replace the Igniter.
Ignition Control After 45 seconds of hot surface igniter pre-heat, the
ignition control will switch 24 VAC to the gas control
valves. Check for 24 VAC output from ignition control,
across terminals marked "valve" and "valve ground". If
no voltage is present, replace ignition control
Gas Control Valves When 24 VAC is supplied to the gas control valve, the
valves should open Check for gas pressure at the
manifold tap located just before the burner. If there is no
pressure, check the incoming gas supply to be sure all
manual valves are open and flexible gas hose is
properly connected. If gas is present at the oven and
coils of gas valve are energized, the gas valve is
defective. When 24 VAC is supplied to the gas control
valve the red burner indicator.
Flame will not stay lit Hot Surface Igniter/ Flame
Sensor
Six seconds after the gas valve opens, ignition must
occur. If flame is not detected, the ignition control will
shutoff and lock out. To reset the ignition control, turn off
the burner switch for 45 seconds then turn on the burner
switch to retry ignition. The ignition control requires a
minimum of 0.8 D.C. microamps To check flame
sensing operation, connect a digital multimeter (capable
of measuring D.C. micro-amps) between the "ground"
terminal on ignition control and the ground lead.
NOTE: This is a current measurement and the meter
must be connected in series. If these readings are not
achieved, check bypass orifice for obstructions. If
bypass orifice is clear, replace the hot surface
igniter/flame sensor.
NOTE: The D.C. micro amp test must be conducted
with the oven in low flame (bypass) operation. Turn the
temperature control to the lowest setting.
Power Supply If there is sufficient micro-amp current, but the flame will
not stay lit, check for proper polarity of the 120 VAC
power supply.
Ignition Control If there is sufficient micro-amp current, and the 120 VAC
polarity is correct, but the flame will not stay lit, replace
ignition control.
NOTE: check for proper ground connection on ignition
control.
Low flame is on, but no
main flame
NOTE: flame should be
present at this time
Check for 120 VAC at terminal #11 to neutral on
temperature control. If no voltage, trace voltage back to
Centrifugal Switch.
Tempe rature Control Turn the temperature adjustment knob to maximum
temperature position and check for 120 VAC at the load
terminal (#9) and neutral. If 120 VAC is present and unit
is not heating, refer to "Temperature Solenoid Valve" for
next check. If 120 VAC is not present, proceed.
20
Impinger II –1100 Series Service Manual - Domestic
Thermocouple Probe WITH POWER ON AND THERMOCOUPLE LEADS
ATTACHED TO THE TEMPERATURE CONTROL
BOARD: Measure the D. C. millivolt output of these
leads. Refer to thermocouple chart on page 36 for
proper readings. If these readings are not achieved,
replace the thermocouple
Tempe rature Control
Potentiometer
WITH POWER OFF: remove the potentiometer leads
from the temperature control board and measure ohms
from black to white leads. The reading should be from
approximately 0 to 2.5 K ohms as the dial of the
potentiometer is turned throughout its full rotation.
From black to red leads, the reading should be
approximately 2.5 K ohms (constant) throughout the full
rotation of the dial. If these readings are not achieved,
replace potentiometer. If the thermocouple probe and
the control potentiometer check good, then the problem
is usually with the temperature control board.
Temperature Solenoid If 120 VAC is present on the Valve temperature control
board at load terminal (#9) to neutral, check for voltage
at temperature regulation valve. If voltage is present,
listen for valve to open and close. Also check for opens
or shorts in the coil. Replace as necessary.
Intermittent Heating Thermal/Overload of Main
Fan and Burner Blower
Motors
.
Conveyor will not run REFER TO PAGE 26
From S/N 2011383 and up REFER TO PAGE 29
Conveyor speed varying or intermittent REFER TO PAGE 26
From S/N 2011383 and up REFER TO PAGE 29
Time/Temp Display inoperative REFER TO PAGE 27
From S/N 2011383 and up REFER TO PAGE 29
Temp Display out or erratic REFER TO PAGE 27
From S/N 2011383 and up REFER TO PAGE 29
Impinger II –1100 Series Service Manual - Domestic
21
TROUBLESHOOTING GUIDE 1100 THRU 1103
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ELECTRIC OVENS
MODEL 1100 / 120/208 VAC / SINGLE PHASE / 60 HZ
MODEL 1101 / 120/240 VAC / SINGLE PHASE / 60 HZ
MODEL 1102 / 120/208 VAC / THREE PHASE / 60 HZ
MODEL 1103 / 120/240 VAC / THREE PHASE / 60 HZ
REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS
SYMPTON POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming Power Supply Check circuit breakers. Reset if required. Call Power Co.
needed.
Fuses, 10 Amp, Check, replace if necessary
Fuseholder Check, replace if necessary
Switch, Main Fan Check for continuity between switch terminals.
Main Fan Relay Check continuity of 120 VAC coil. Check for power to
relay coil (120 VAC). Check for 208/240 VAC to the relay
erminals
Main Fan Motor Check for opens, shorts, or grounds. WITH POWER
OFF: Turn fan blade to check for locked rotor
Capacitor Check for opens, shorts, or grounds.
No control box cooling Check for main fan operation. If not operating, refer to
"Oven fan will not run". Cooling Fan Motor 120 VAC
should be present at the fan motor. If voltage is present,
check for opens or shorts. .WITH POWER OFF: Check
or locked rotor of the fan motor.
No main fan cool down Cool Down Thermostat Check cool down thermostat (thermostat closes at 160°F
and opens at 140°F). Check for power (120 VAC) at cool
down thermostat. With cool down thermostat preheated,
check for continuity. If switch is open, replace.
Oven will not heat Main Fan Motor Check for main fan operation. If it is not operating, refer
o "Oven fan will not run".
High Limit Thermostat, Oven
Cavity
Switc h, Heat
Fuse, 3 Amp Check, replace if necessary.
Fuseholder Check, replace if necessary
ir Pressure Switch
emperature Control Check for 120 VAC supply at terminal #11 to neutral on
hermocouple Probe
erminals are normally closed. If open, reset the
hermostat and test for proper operation. If it will not
reset and hold, then replace.
ith switch on, check for 120 VAC on both terminals to
neutral. Replace if defective
his normally open switch should close when the main
an is activated. If adjustment is necessary (Refer to
Section D). Replace if defective.
emperature control. If no voltage is present, trace wiring
back to 3 amp fuse. Turn the temperature adjustment
knob to maximum temperature position and check for
120 VAC at the load terminal (#9) and neutral. If 120
AC is present and unit is not heating, refer to "Mercury
Contactor" for next check. If 120 VAC is not present,
proceed.
ITH POWER ON AND THERMOCOUPLE LEADS
TTACHED TO THE TEMPERATURE CONTROL
BOARD: measure D. C. millivolt output of these leads.
Refer to thermocouple chart on page 36 for proper
readings. If these readings are not achieved, replace
hermocouple.
22
Impinger II –1100 Series Service Manual - Domestic
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