SERVICE MANUAL
(DOMESTIC)
IMPINGER CONVEYOR OVENS
MODEL 1450,1451
WITH PUSH BUTTON CONTROLS
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
United States of America
Phone: (800) 374-3004
U.S. Fax: (888) 790-8193 • Int’l Fax: (260) 436-0735
Technical Service Hot Line
(800) 678-9511
www.lincolnfp.com
1450digservice |
REV 1/30/08 |
SEQUENCE OF OPERATION
IMPINGER ADVANTAGE
SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)
MODEL 1450 |
120VAC |
60 HZ. |
NAT. GAS |
MODEL 1451 |
120VAC |
60 HZ. |
LP GAS |
POWER SUPPLY
CONTROL BOX AUTO COOL DOWN
MAIN FAN CIRCUIT
BURNER CIRCUIT
IGNITION CONTROL
TEMPERATURE CONTROL
CONVEYOR DRIVE
Electrical power is supplied to the oven by a three conductor cordset. Voltage from the black conductor to the white conductor is 120VAC. The white conductor is neutral. The green conductor is ground.
When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C), the cooling fan thermostat will switch power to the control box cooling fan. The thermostat will interrupt power to the cooling fan when the control box temperature falls to 100°F ± 3° (37.0°C ± 1.7°C).
Electrical power is permanently supplied, through a 10 Amp fuse, to the normally open contacts of the oven power switch. Power is also supplied to the normally open control box cooling fan thermostat. Closing the oven power switch supplies 120VAC to the main fan motor and to the control box cooling fan. Closing the oven power switch also supplies 120VAC to the burner blower motor, the primary of the oven control transformer and to the centrifugal switch of the main fan motor.
Closing the oven power switch supplies 120VAC to the burner blower motor and to the normally open centrifugal switch of the main fan motor. As the main fan motor reaches approx.900 RPM, the centrifugal switch closes supplying 120VAC to the oven control and to the primary of the burner transformer. The transformer secondary supplies 24VAC, through the centrifugal switch of the burner blower motor, to the ignition control.
When the ignition control is supplied with 24VAC, the pilot valve and spark igniter are energized. Ignition should now occur. After the pilot flame is proven, the main valve is energized.
Closing the oven fan switch supplies 120VAC to the primary of the control transformer and, through the centrifugal switch of the main fan motor, to the oven control. Secondary voltage, 24VAC, is supplied to the oven control. The oven control is set to desired temperature. The thermocouple will provide varying millivolts to the oven control. The oven control supplies 120VAC to the temperature regulation valve at intermittent intervals to maintain the desired temperature. The display on the oven control will indicate when the temperature regulation valve is energized.
NOTE: The display also indicates oven temperature.
Closing the oven power switch supplies 120VAC to the conveyor motor and to the primary of the control transformer. Secondary voltage, 24VAC, is supplied to the oven control. Setting the oven control to the desired time outputs voltage, through a reversing switch, to the conveyor motor.
NOTE: The conveyor system uses a hall effect sensor and magnet to prove operation of the conveyor motor. If the conveyor motor is not running, “BELT JAM” is indicated on the display.
2 |
Impinger I – 1450 Series Service Manual - Domestic |
SCHEMATIC DIAGRAM
MODEL 1450, 1451
SERIAL NUMBER N28654 AND ABOVE
Impinger I – 1450 Series Service Manual - Domestic |
3 |
TROUBLESHOOTING GUIDE
IMPINGER ADVANTAGE GAS OVENS SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)
SYMPTOM |
POSSIBLE CAUSE |
EVALUATION |
Oven fan will not run |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
|
|
plug to be sure it is firmly in receptacle. Measure |
|
|
incoming power, call power co. if needed. |
|
Fuse, 10 Amp |
Check, replace if necessary. |
|
Fuse holder |
Check, replace if necessary. |
|
Switch, oven power |
Check for 120VAC supply to switch. If no voltage is |
|
|
present, trace wiring back to fuse holder. Check |
|
|
continuity between switch terminals. Replace switch as |
|
|
needed. |
|
Motor, main fan |
Check for 120VAC supply to the motor. If no voltage is |
|
|
present, trace wiring back to the switch. Check motor |
|
|
for opens, shorts or grounds. |
|
|
WITH POWER OFF: Turn fan blade to check for locked |
|
|
rotor. |
No control box cooling |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
|
|
plug to be sure it is firmly in receptacle. Measure |
|
|
incoming power, call power co. if needed. |
|
Fuse, 10 Amp |
Check, replace if necessary. |
|
Fuse holder |
Check, replace if necessary. |
|
Switch, oven power |
Check for 120VAC supply to switch. If no voltage is |
|
|
present, trace wiring back to fuse holder. Check |
|
|
continuity between switch terminals. Replace switch as |
|
|
needed. |
|
Cooling fan |
Check for 120VAC supply to the cooling fan. If no |
|
|
voltage is present, trace wiring back to the oven power |
|
|
switch. If voltage is present and motor does not run, |
|
|
check for opens, shorts or grounds. |
|
|
WITH POWER OFF: Check for locked rotor. |
No automatic control |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
box cooling |
|
plug to be sure it is firmly in receptacle. Measure |
|
|
incoming power. Call power co. if needed. |
|
Cooling fan thermostat |
Check cooling fan thermostat (thermostat closes at |
|
|
120°F and opens at 100°F). With cooling fan |
|
|
thermostat pre-heated, check for continuity. If |
|
|
thermostat is open, replace cooling fan thermostat. |
Control box cooling |
Cooling fan thermostat |
See “Cooling fan thermostat” (NOTE: Thermostat will |
fan continues to run |
|
remain closed if control box temperature remains |
|
|
above 120°F. |
Oven will not heat |
Main fan |
If not operating, refer to “Oven fan will not run”. |
|
Gas supply |
Check for adequate gas supply to oven. |
|
Centrifugal switch of main fan |
Check for 120VAC at wire #5 (input to centrifugal |
|
motor |
switch, located at 6-pin connector inside motor cover |
|
|
near main fan motor) to neutral. If no voltage is present, |
|
|
trace wiring back to oven power switch. If voltage is |
|
|
present, check for 120VAC at wire #9 (output of |
|
|
centrifugal switch) to neutral. If no voltage is present at |
|
|
wire #9, and the motor is running, replace the main fan |
|
|
motor. |
|
Burner blower motor |
Check for 120VAC supplied to burner blower motor. If |
|
|
no voltage is present, trace wiring back to primary of |
|
|
control transformer. If voltage is present and motor is |
4 |
|
Impinger I – 1450 Series Service Manual - Domestic |
|
|
not running, check for opens, shorts or grounds. |
|
|
WITH POWER OFF: Turn motor to check for locked |
|
|
rotor. Replace burner blower motor as needed. |
|
Burner transformer |
Check for 120VAC supplied to primary of burner |
|
|
transformer. If no voltage is present, trace wiring back |
|
|
to centrifugal switch of main fan motor. If voltage is |
|
|
present, check for 24VAC supply at transformer |
|
|
secondary. If there is primary voltage but no secondary |
|
|
voltage, replace burner transformer. |
|
Centrifugal switch of burner |
Check for 24VAC at motor connector, wire #19 (input to |
|
blower motor |
centrifugal switch) to neutral. If no voltage is present, |
|
|
trace wiring back to burner transformer. If voltage is |
|
|
present, check for 24VAC at wire #20 (output of |
|
|
centrifugal switch) to neutral. If no voltage is present at |
|
|
wire #20 and motor is running, replace burner blower |
|
|
motor. |
|
Ignition control |
Check for 24VAC supply to the ignition control. If no |
|
|
voltage is present, trace wiring back to centrifugal |
|
|
switch of burner blower motor. If voltage is present, |
|
|
check for 24VAC at pin #3 and ground (pilot valve). |
|
|
NOTE: The Honeywell ignition control has a 30 second |
|
|
pre-purge (time delay) built in. If voltage is not present, |
|
|
replace ignition control. If the pilot valve is energized, |
|
|
check to see that the high voltage igniter circuit is also |
|
|
energized. To check, disconnect the igniter lead from |
|
|
the ignition control. |
|
No pilot flame |
If the ignition control is supplied with 24Vac and the |
|
|
pilot valve (internal to valve assembly) and igniter |
|
|
circuits are energized, visually check for pilot flame. |
|
|
This may be done by opening the small inspection door |
|
|
on the end of the burner, or by opening the main oven |
|
|
door and looking under the lower finger housings on |
|
|
the right side of the oven. If no pilot flame is visible, |
|
|
check the pilot shut-off valve. |
|
Pilot shut-off valve |
Check to see that the pilot shut-off valve is open (shut- |
|
|
off valve is located between valve assembly and |
|
|
burner). |
|
Pilot tube |
Check for gas pressure at the pilot tube. Disconnect |
|
|
pilot tube at burner and connect a manometer to pilot |
|
|
tube. If no gas pressure is present during ignition, |
|
|
check for blockage in pilot tube or pilot shut-off valve. If |
|
|
these are clear, and there is gas supplied to the oven, |
|
|
replace the gas valve. |
|
Pilot orifice |
If there is gas pressure at the pilot tube, check the pilot |
|
|
orifice for obstructions. Replace as needed. |
|
Burner igniter |
Check the burner igniter head for any obstructions, also |
|
|
check for frayed or broken wire. Check spark gap (gap |
|
|
should be .100 to .125 inch). If there is visible damage, |
|
|
replace burner igniter. |
|
NOTE: Flame should be on |
|
|
at this time |
|
Pilot flame, but no |
Control transformer |
Check for 120VAC supply to the primary of the control |
main flame |
|
transformer. If no voltage is present, trace wiring back |
|
|
to the oven power switch. If voltage is present, check |
|
|
foe 24VAC at the transformer secondary. If there is |
|
|
primary voltage, but no secondary voltage, replace |
|
|
control transformer. |
|
Oven control |
Check for 24VAC supply to oven control. If no voltage |
|
|
is present, trace wiring back to control transformer. If |
|
|
24VAC is present, check for a read-out on the display. |
|
|
If there is 24VAC supplied, but there is no read-out on |
Impinger I – 1450 Series Service Manual - Domestic |
5 |
|
|
the display, replace oven control. If there is a read-out |
|
|
on the control, set the control to maximum temperature |
|
|
(see Installation operations manual for temperature |
|
|
adjustment). With the control set at maximum |
|
|
temperature, check for 120VAC at the temperature |
|
|
regulation valve. If there is voltage at the temperature |
|
|
regulation valve, proceed to “Temperature regulation |
|
|
valve” for next check. If there is no voltage at the |
|
|
temperature regulation valve, trace wiring back to the |
|
|
oven control. If there is no voltage output at the oven |
|
|
control, check the read-out on the oven control. If the |
|
|
control reads “PROBE FAIL”, this indicates that the |
|
|
thermocouple has failed or become disconnected from |
|
|
the oven control. |
|
Thermocouple |
Check to be sure that the thermocouple is securely |
|
|
connected to the oven control. If the thermocouple is |
|
|
connected to the oven control, and the control indicates |
|
|
“PROBE FAIL”, disconnect the thermocouple from the |
|
|
oven control and measure the resistance of the |
|
|
thermocouple. The thermocouple should read approx. |
|
|
11Ω. If these readings are not achieved, replace the |
|
|
thermocouple. If these readings are correct, proceed. |
|
Oven control |
If the thermocouple checks good, but the oven control |
|
|
display indicates that there is a thermocouple failure, |
|
|
replace the oven control. If the oven control indicates a |
|
|
temperature reading, but the oven will not heat, |
|
|
proceed. |
|
Thermocouple |
WITH POWER ON AND THERMOCOUPLE |
|
|
ATTACHED TO THE OVEN CONTROL: Measure the |
|
|
DC millivolt output of the thermocouple. Refer to the |
|
|
thermocouple chart (located in the “Removal” section of |
|
|
the manual) for proper millivolt readings. If these |
|
|
readings are not achieved, replace thermocouple. |
|
Oven control |
If the thermocouple checks good, but there is no |
|
|
120VAC output to the temperature regulation valve, |
|
|
replace the oven control. If there is 120VAC output to |
|
|
the temperature regulation valve, proceed. |
|
Temperature regulation valve |
Check for 120VAC supplied to the temperature |
|
|
regulation valve. If voltage is present, listen for valve to |
|
|
open and close. Also check for opens or shorts in the |
|
|
operating coil. Replace temperature regulation valve as |
|
|
needed. |
Intermittent heating |
Thermal/overload of main fan |
The main fan motor and burner blower motor are |
|
and burner blower motors |
equipped with internal thermal protection and will cease |
|
|
to operate if overheating occurs. As the motors |
|
|
overheat and then cool, this will cause the heating |
|
|
system to cycle on and off intermittently. Improper |
|
|
ventilation or lack of preventive maintenance may |
|
|
cause this problem. Also, most of the problems listed |
|
|
under “Oven will not heat” can cause intermittent |
|
|
failure. |
Conveyor will not run |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
|
|
plug to be sure it is firmly in receptacle. Measure |
|
|
incoming power, call power co. if needed. |
|
Fuse, 10 Amp |
Check, replace if necessary. |
|
Fuse holder |
Check, replace if necessary. |
|
Switch, oven power |
Check for 120VAC supply to switch. If no voltage is |
|
|
present, trace wiring back to fuse holder. Check |
|
|
continuity between switch terminals. Replace switch as |
|
|
needed. |
6 |
Impinger I – 1450 Series Service Manual - Domestic |
|
Control transformer |
Check for 120VAC supply to the primary of the control |
|
|
transformer. If no voltage is present, trace wiring back |
|
|
to the oven power switch. If voltage is present, check |
|
|
foe 24VAC at the transformer secondary. If there is |
|
|
primary voltage, but no secondary voltage, replace |
|
|
control transformer. |
|
Conveyor motor |
Check for 120VAC supply to conveyor motor at wire #6 |
|
|
to neutral. If no voltage is present, trace wiring back to |
|
|
oven power switch. If voltage is present and motor will |
|
|
not run, check the motor windings for opens or shorts. |
|
|
WITH POWER OFF: Check the motor windings as |
|
|
follows: |
|
|
Grey to black - 38Ω approx. |
|
|
Grey to blue - 38Ω approx. |
|
|
Blue to black - 75Ω approx. |
|
|
If any of the above fails, replace conveyor motor. |
|
Capacitor, conveyor motor |
Check for shorts or grounds. Replace capacitor as |
|
|
needed. |
|
|
WARNING: Capacitor has a stored charge, discharge |
|
|
before testing. |
|
Switch, conveyor reversing |
Check continuity between switch terminals. Replace as |
|
|
needed. |
|
Oven control |
If there is 120VAC supplied to the motor, and the |
|
|
motor, capacitor, and reversing switch check good, |
|
|
replace the oven control. |
Conveyor motor runs, |
NOTE: Display will indicate |
|
but there is no speed |
“BELT JAM” |
|
display |
|
|
|
Oven control |
Check for output voltage from oven control to hall effect |
|
|
sensor (sensor is located in conveyor motor). Measure |
|
|
voltage at the motor connector, red wire and yellow |
|
|
wire. Voltage should be approx. 10VDC. If no voltage is |
|
|
present, trace wiring back to oven control. If there is no |
|
|
voltage present at the oven control, replace the oven |
|
|
control. |
|
Conveyor motor |
If there is voltage supplied to the hall effect sensor, |
|
|
check for a frequency output from the hall effect |
|
|
sensor. Measure frequency across the yellow and white |
|
|
wires at the motor connector. Frequency reading |
|
|
should be approx. 25 – 100 Hz. If these readings are |
|
|
not achieved, replace conveyor motor. If these readings |
|
|
are achieved, proceed. |
|
Oven control |
If the hall effect sensor readings are correct, but there |
|
|
is no speed indicated on the display, replace the oven |
|
|
control. |
Impinger I – 1450 Series Service Manual - Domestic |
7 |
REMOVAL, INSTALLATION & ADJUSTMENTS
IMPINGER ADVANTAGE SERIES
CAUTION!
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE IMPINGER
OVEN BE SURE TO DISCONNECT ELECTRICAL POWER AND GAS SUPPLY
MOTOR, MAIN FAN - REPLACEMENT
1.Shut off power at main breaker.
2.Remove louvered motor cover from back of oven.
3.Remove wireway by taking out the (5) five hex screws.
4.Disconnect wiring from motor.
5.Remove the twelve (12) hex head bolts from the oven back and slide back straight out of the oven.
6.Remove two (2) bolts from fan hub and remove fan from motor shaft.
NOTE: Measure distance from fan blade to rear wall assembly before removal to aid in reassembly.
7.Remove the eight (8) hex head bolts from the motor mount and slide the motor assembly out of the oven back.
8.Remove motor by taking off motor clamp and removing the four (4) mounting nuts and washers.
9.Reassemble in reverse order. When motor mount assembly is set on the oven back, align motor shaft in the center of the hole. Set fan assembly on the motor shaft.
NOTE: A. Torque specs on bolts (150 in/lb. torque)
B. It is recommended that an anti-seize compound be brushed on to the bolts around the back and motor mount bracket before assembly.
FAN, MAIN - REPLACEMENT
1.Shut off power at main breaker.
2.Remove back assembly. (See MOTOR, MAIN FAN)
3.Reinstall and locate fan so that the bottom of the fan spider is 1 1/2" from the top of the oven back cone. (See Drawing)
FAN SPIDER |
NOTE: MEASUREMENT MUST BE |
|
MADE FROM CONE TO FAN SPIDER |
FAN HUB
1 1/2 INCH
CONE
CAPACITOR, MOTOR - REPLACEMENT
1.Shut off power at main breaker.
2.Remove motor cover from back of oven.
3.Discharge capacitor.
4.Remove and replace.
COOLING FAN, CONTROL BOX - REPLACEMENT
1.Shut off power at main breaker.
2.Remove control panel top and front cover.
3.Remove four (4) screws from the fan frame.
4.Disconnect cord and plug and remove fan.
5.Reassemble in reverse order.
8 |
Impinger I – 1450 Series Service Manual - Domestic |