Lincoln Impinger Conveyor Ovens 1633 000 EA User Manual

SERVICE MANUAL  
(INTERNATIONAL)  
IMPINGER CONVEYOR OVENS  
LOW PROFILE 1600 INTERNATIONAL ADVANTAGE  
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  
1600expadv  
REV: 1/8/07  
SEQUENCE OF OPERATIONS  
MODEL 1633-000-EA 230 VAC 50HZ NATURAL GAS  
MODEL 1634-000-EA 230 VAC 50HZ L.P. GAS  
POWER SUPPLY  
Electrical power to be supplied to the oven by a three conductor service.  
Brown conductor is hot  
Blue conductor is neutral.  
Green conductor is ground.  
CONTROL BOX  
AUTO COOL DOWN  
When the temperature in either one of the control boxes reaches 120°F ±3° (49°C ± 1.7° ) , the cooling fan  
thermostats will switch power to the cooling fans . The thermostats will interrupt power to the cooling fans when  
the temperature falls to 100°F ± 3° (37°C ± 1.7° )  
MAIN FAN CIRCUIT  
Line voltage is permanently supplied to a normally open contact of the oven power switch. Line voltage is  
permanently supplied to the two normally open cooling fan thermostats, a normally open contact of the oven  
power relay. Closing the oven power switch supplies line voltage to oven power relay, its contacts now close,  
supplying line voltage to the two main fan motors and the two burner circuits. Closing the oven power switch also  
supplies line voltage to the control box cooling fans, the temp. display, and the conveyor circuit.  
BURNER CIRCUIT  
NOTE: This oven utilizes two complete burner/ temperature control systems. The sequence of operations is the  
same for each system.  
Closing the main fan switch supplies line voltage, through the oven power relay, through a three amp. fuse,  
through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit  
thermostat, to the ignition control. The combustion motor is energized. The normally open combustion air switch  
closes upon sensing air pressure. After a pre-purge period of between 30 and 60 seconds, the ignition  
transformer and the main gas valve are energized. Ignition should now occur.  
TEMPERATURE CONTROL  
Closing the oven power switch supplies line voltage, through the oven power relay, through a three amp. fuse,  
through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit  
thermostat, to the temperature control board. The 1.0K temperature pot. is adjusted to desired temperature. The  
thermocouple will provide varying millivolts to the temperature control. The temperature control supplies line  
voltage to the solenoid valve at intermittent intervals to maintain desired temperature.  
CONVEYOR DRIVE  
Closing the oven power switch supplies line voltage, through the oven power relay, through the electromagnetic  
filter to the conveyor control. AC volts are converted to DC volts and are supplied to the conveyor motor at  
terminals A+ and A-.  
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Adjustments of the speed control potentiometer will change resistance at terminals P1 and P2 varying the DC  
voltage to the motor. The speed of the conveyor motor will increase or decrease as the DC voltage from the board  
increases or decreases respectively.  
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor that senses motor  
speed. Any change in motor load ( ± RPM ) is detected by the sensor and the voltage to the motor is adjusted  
accordingly.  
TEMPERATURE DISPLAY  
Closing the power switch supplies line voltage to the primary of the temperature display transformer. The  
secondary of this transformer supplies 12 VAC to the temperature display. The thermocouple supplies DC  
millivolts to the temperature display. The display converts this millivolt reading to a temperature reading.  
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Low Profile – 1600 Advantage Series Service Manual – International  
SCHEMATIC MODELS 1633-000-EA AND 1634-000-EA  
Low Profile – 1600 Advantage Series Service Manual – International  
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TROUBLESHOOTING GUIDE  
MODEL 1633-000 EA NATURAL GAS 230 VAC 50 HZ 1 PHASE  
MODEL 1634-000-EA L.P. GAS  
230 VAC 50 HZ 1 PHASE  
NOTE: When checking components on left side of unit, be sure to check for proper  
connections in power connector, ( marked P. C. on schematic diagram ) located inside  
motor cover.  
SYMPTOM  
POSSIBLE CAUSE  
EVALUATION  
Oven fan will  
not run  
Incoming power supply  
Oven fan switch  
Check breakers/ reset if required  
call Power company if needed  
Check continuity between  
switch terminals.  
Thermostat, hi-limit  
Terminals are normally closed, if  
open, reset thermostat and test  
oven for proper operation. If it  
will not reset, replace thermostat.  
Check, replace if necessary.  
Check, replace if necessary.  
Check for power to coil of oven  
fan relay. If no voltage is present,  
trace wiring back to hi-limit thermostat.  
Check for supply voltage at terminal  
#6 of the relay. If no voltage is present,  
trace wiring back to fuse holder. If  
voltage is present, at the relay coil, check  
to insure the contacts are closing.  
Check for opens, shorts, or grounds.  
Check for opens, shorts, or grounds.  
(SEE OVEN  
Fan fuse  
Fuse holder  
Oven fan relay  
Capacitor(s)  
Motor (s)  
Fan switch  
Hi-limit  
Oven fan relay  
Cooling fan(s)  
No control box cooling  
FAN WILL  
NOT RUN.)  
Supply voltage should now be at these  
motors. If voltage is present, check  
motor for open, shorts, or grounds.  
WITH POWER OFF: check for  
locked rotor.  
No automatic control  
box cooling  
Incoming power supply  
Cooling fan thermostats  
Check circuit breakers, reset if needed.  
Call power company if needed.  
Thermostat closes at 120°F and  
opens at 100°F. With the cooling  
fan thermostat preheated, check  
for continuity. If switch is open, replace.  
Supply voltage should now be at these  
motors. If voltage is present, check  
motor for opens, shorts or grounds.  
WITH POWER OFF: Check for  
locked rotor.  
Cooling fan(s)  
Oven will not heat  
Gas supply  
Check for adequate gas supply to oven.  
Check to see that the manual gas shut  
off valve is open.  
Check to see that the fan switch is on.  
Check if main oven fan is operating.  
if not, refer to “oven fan will not run”.  
Manual gas shut off valve  
Fan switch  
Main oven fan  
NOTE: These ovens utilize 2 complete Burner/Temperature control systems. Each system will  
Follow the same troubleshooting sequence.  
Fuse, burner 3A.  
Check, replace if necessary.  
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Low Profile – 1600 Advantage Series Service Manual – International  
Fuse holder  
Gas pressure switch  
(internal to gas valve)  
Check, replace if necessary.  
Check for supply voltage to neutral  
on both sides of switch. If voltage is  
present on one side of switch only,  
check the following. Check for proper  
gas pressure supply to gas valve.(Marked  
on oven spec. plate.) Check for proper  
adjustment of gas pressure switch.  
should be set at 10 Nat., 27 for L.P.  
or 4.5 for town gas. Check gas filter in  
gas valve for blockage or damage. (See  
Adjustment section for location.)  
If the above checks OK, but switch is  
still not closed replace gas valve.  
Check for supply voltage on both sides  
of switch. If voltage is present on one  
side only, check for air tube blockage.  
Adjust air pressure switch. If the above  
fails, replace air pressure switch.  
Terminals are normally closed. If open,  
reset and test oven for proper operation.  
If thermostat will not hold for maximum  
oven temperature, and oven is not  
exceeding maximum temperature dial  
setting, check for proper location of  
capillary bulb in its spring holder.  
If above checks OK, replace hi-limit.  
Check for supply voltage to ignition  
control at terminal #1 and neutral.  
If voltage is not present, trace wiring  
back to hi-limit thermostat. Check for  
supply voltage at terminal #6 to neutral.  
If no voltage is present, wait 30 seconds  
and check reset button. If above fails,  
replace ignition control.  
Oven air pressure switch  
Hi-limit thermostat  
Ignition control  
Burner reset switch  
Burner blower motor  
Switch is normally open. Check to see  
that the switch closes when reset button  
is pushed. Replace as needed.  
Check for supply voltage to burner  
blower motor.  
WITH POWER OFF: Turn blower  
wheel to check for locked rotor. If  
supply voltage is present and motor does  
not run, replace motor.  
Check for supply voltage switching to  
terminal N. O. as the air pressure switch  
closes. Check for air tube blockage or  
misalignment, adjust air pressure switch.  
If the above fails, replace air pressure  
switch.  
After a pre-purge time of 30 to 60  
seconds after blower motor starts,  
check for supply voltage to spark  
generator. If voltage is not present,  
Check reset button located on rear of  
control box. If voltage is still not  
Burner blower motor  
Air pressure switch  
Spark generator  
present, replace ignition control.  
If voltage is present, visually check  
for spark at igniter head.  
Check for visible damage to igniter/  
sensor assembly. If there is no visible  
damage to the components, and no spark,  
Igniter/sensor assembly  
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replace the spark generator. If there  
is visible damage to the igniter/sensor  
assembly, replace. Also check for frayed  
or damaged wires in burner tube.  
Check for supply voltage to gas valve.  
If there is no voltage present, check  
reset button, check all connections for  
tightness. If there still is no voltage at  
gas valve, replace ignition control.  
If there is voltage present, check for  
gas pressure at gas pressure tap located  
in gas piping at burner manifold.  
Gas valve  
If there is no gas pressure, replace  
gas valve.  
Flame will not stay on  
Flame sensor  
To check for flame sensor operation,  
connect a digital multimeter (capable  
of measuring D.C. micro amps) in  
series with the flame sensor wire and  
ignition control. Sensor current is 3  
micro amps D.C. minimum.  
NOTE: The D.C. micro amp test must  
be conducted with the oven in low  
flame (bypass) operation. Turn the  
temperature control to its lowest  
setting. If these readings are not  
achieved, replace igniter/sensor assy.  
Also, check for any type of damage to  
flame sensor wire and connections.  
If there is sufficient flame sensor current,  
but the burner will not remain ignited,  
check the reset button on ignition control.  
NOTE: Check for proper polarity of  
the power supply. If all of the above  
are OK, replace ignition control.  
Ignition control  
Pilot lamp is on,  
But no main flame  
Temperature control  
Check for supply voltage across  
terminals L2 and 240 on temperature  
control board. If no voltage is present,  
check wiring back to hi-limit thermostat.  
Turn the temperature adjustment knob to  
the maximum temperature position and  
check for supply voltage at the load  
terminal #7 and #8. If voltage is present  
and unit is not heating, refer to  
“temperature regulation valve” for next  
check. If voltage is not present, proceed.  
With power on and thermocouple leads  
attached to board, measure the millivolt  
out put of the thermocouple. Refer to the  
thermocouple chart in section D for  
proper readings.  
WITH POWER OFF: Remove the  
potentiometer leads from the temperature  
control board. Place ohm meter test leads  
on the blue and green pot leads. Reading  
should be 1 K ohms. Place meter leads  
across the blue and purple pot leads and  
rotate knob from high to low. Repeat on  
green and purple leads. Check for even  
rise and fall of ohms reading to insure  
that there are no open or dead spots in  
the potentiometer. Check each lead to  
ground for shorts. Replace potentiometer  
Thermocouple probe  
Temperature control  
Potentiometer  
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Low Profile – 1600 Advantage Series Service Manual – International  
as needed.  
Temperature regulation  
valve  
If supply voltage is present on the  
temperature control board at the load  
terminals #7 and #8, 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 if required.  
The main fan motors and the burner  
blower motors are equipped with  
internal thermal protection and will  
cease to operate if overheating occurs.  
As the motors overheat and then cool,  
this will cause the units to cycle on  
and off intermittently. This may be  
caused by improper ventilation or lack  
of preventive maintenance. Also, most  
Intermittent heating  
Thermal overload of  
main fan and burner  
blower motors  
of the problems listed under “Oven  
will not heat” can cause intermittent  
failure.  
Check for supply voltage at terminals  
L1 and L2. If voltage is not present,  
check breakers.  
See procedure for checking on page 6.  
Check and/or replace.  
Check and/or replace.  
Check for supply voltage input to  
filter. If there is no voltage, trace wiring  
back to relay. If there is input voltage,  
check for output voltage. If there is  
input voltage but no output voltage,  
replace filter.  
Conveyor will not run  
Power supply  
Fan switch  
Fuse, 10 Amp.  
Fuse holder  
Filter E.M.I.  
Speed adjustment  
potentiometer  
This is a 0 to 10K ohm, 1 turn  
potentiometer. With power off, remove  
the black and white pot leads from the  
conveyor control board at terminals  
P1 and P2. Place the meter leads on  
black lead (P2) and the white lead (P1).  
Rotating the pot. slowly, from low to  
high, the meter reading should show  
an even transition from 0 to 10K ohms  
± 5%. There should be no dead or open  
spots through the one turn of the pot.  
Check both leads to ground. There  
should be no continuity to ground.  
If any of the above fail, replace  
the potentiometer.  
D.C. motor  
Check for supply voltage input to  
the control board at terminals L1 and L2  
control board  
If not present, check wiring back to  
the filter. If supply voltage is present,  
check both fuses on the control board  
( 8 Amp. line and 1Amp. armature).  
Check the D.C. voltage output at  
terminals A+ and A-. If A.C. voltage  
is at terminals L1 and L2, and no  
D.C. voltage is present at A+ and A-,  
replace control board. If A.C. voltage is  
present and D.C. voltage is present but  
the motor will not run, check gear motor  
as follows:  
If D.C. voltage is present at A+ and A-  
Conveyor  
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gear motor  
and the motor does not run, first check  
the mini breaker and then the conveyor.  
Refer to the next possible cause. Check  
the leads to the motor for evidence of  
any shorts or opens , and each lead to  
ground. Check motor brushes . From  
the top of the motor, rotate motor shaft  
to determine if there is a locked rotor  
or a locked gearbox (use care so magnet  
and Hall Effect sensor board are not  
damaged). Replace motor as needed.  
Check for any mechanical misalignment.  
Also, check for worn bearings.  
Conveyor  
A conveyor belt that is over tightened  
will cause excessive bearing wear and  
sometimes, irregular speed.  
Check power supply at the D.C. control  
board for supply voltage at board terminals  
L1 and L2.  
Place the test meter probes on terminals  
A+ and A-. (with speed potentiometer  
set to maximum speed – approximately  
2 min.). The meter reading should be  
approximately 100VDC(±3%), if  
voltage is not steady within limits,  
then the board is usually bad.  
Conveyor speed varying  
or intermittent  
Power supply  
Motor control board  
Always check the speed potentiometer,  
be sure it is OK before changing a  
control board. This test is not always  
100% accurate as this test is not  
performed at operating speeds, However,  
this test is the best method currently  
available.  
If the D.C. control board is steady,  
then the problem may be the motor or  
gearbox. Check the brushes in the  
motor for excessive arching or  
D.C. Gearmotor  
unusual wear. Check the motor and  
gearbox from instructions located on  
page 9 under “possible cause”  
listing “conveyor gear motor”  
Magnet  
Check to insure that the magnet  
(cemented to shaft of conveyor drive  
motor) has not been damaged, or come  
loose from the motor shaft. Replace  
as needed.  
Hall Effect  
Sensor  
Check for any physical damage to  
hall effect sensor (mounted on  
conveyor drive motor). Check all  
wiring and connections for tightness  
and proper location. Replace as needed.  
Connect new hall effect to system  
and check for steady operation.  
Measure the transformer primary  
for supply voltage input. If voltage is  
not present, trace wiring back to the  
fan relay. If voltage is present,  
Temperature display  
inoperative  
Display transformer  
measure the secondary output of the  
transformer. Voltage across terminals  
1-3 should be 12-15VAC. Terminals  
1-2 and 2-3 should be ½ the voltage  
reading from terminals 1-3. If the above  
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Low Profile – 1600 Advantage Series Service Manual – International  
secondary readings are not achieved,  
replace transformer.  
If proper voltage is present at terminals  
1,2, and 3 on temperature display, but  
but the display is not lighted, recheck  
all connections for tightness. If  
temperature display is still not operating,  
replace the temperature display.  
Connect the thermocouple of a  
Temperature display  
Thermocouple  
Temperature display  
Inaccurate, erratic  
Or inoperative  
pyrometer to the thermocouple on  
the temperature control board. (be sure  
to maintain proper polarity of  
thermocouple leads—see adjustment  
section for proper procedure.) The  
pyrometer will indicate oven temperature  
display. Measure D.C. millivolts of  
thermocouple at the temperature display.  
See thermocouple chart in section D for  
proper readings. Replace thermocouple  
if proper readings are not achieved. If  
readings are correct on the thermocouple,  
replace temperature display.  
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REMOVAL, INSTALLATION & ADJUSTMENTS  
MODEL SERIES 1633-000-EA, 1634-000-EA  
CAUTION !  
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE  
IMPINGER OVEN BE SURE TO DISCONNECT ELECTRICAL POWER AND GAS SUPPLY.  
IGNITION CONTROL – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove front portion of relay by releasing tabs on side pulling straight out (rocking motion).  
C. Remove wires from plug-in terminal strip, note wire numbers and location.  
D. Remove two screws from mounting bracket and remove.  
E. Reassemble in reverse order. Check system operation.  
BURNER BLOWER MOTOR – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Unplug motor connector.  
C. Remove three screws from blower tube at burner housing.  
D. Remove air shutter assy. From old motor for installation on new motor assy.  
E. Reassemble in reverse order and check system operation  
NOTE : CHECK AIR SHUTTER ADJUSTMENT – should be set at ½ open.  
BURNER INDICATOR LIGHT – REPLACEMENT  
A. Remove control box cover.  
B. Remove two wires from light housing.  
C. Slide light housing sideways to remove.  
D. Reassemble in reverse order and check system operation.  
AIR PRESSURE SWITCH – REPLACEMENT  
A. Remove control panel top.  
B. Disconnect wires from switch making note of wire number and location for reinstallation.  
C. Remove air tube from switch assembly.  
D. Remove switch from wire hanger.  
E. Install new switch in reverse, make sure air tube is not blocked or misaligned.  
To adjust air pressure switch, remove cover from the switch to expose adjusting screw. To  
increase sensitivity, turn screw counter- clockwise ; to decrease sensitivity, turn screw  
clockwise. Check for proper line voltage switching from N.C. to N.O. as the air pressure  
switch closes.  
CONVEYOR CONTROL POTENTIOMETER (10 K OHM ) – REPLACEMENT  
A. Remove control box cover.  
B. Loosen two allen screws and remove knob by sliding off shaft.  
C. Remove nut from potentiometer shaft and push out.  
D. Unplug wire connector from conveyor control board.  
E. Reassemble in reverse order and check system operation.  
F. Recalibrate conveyor control board.  
CONVEYOR CONTROL BOARD – REPLACEMENT  
A. Shut off power at main breaker.  
B. Remove control panel top and front cover.  
C. Disconnect wiring ( push on connectors ) from control board, note proper location of  
connectors for reinstallation and exchange boards on the mounting bracket before  
reinstallation.  
D. Reassemble in reverse order and check system operation.  
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CONVEYOR CONTROL BOARD – CALIBRATION  
A. Connect digital volt meter to the hall effect sensor. Black meter lead connected to black hall  
effect sensor lead, red meter lead to white hall affect sensor lead.  
B. Turn conveyor control knob fully counter clockwise. Loosen knob and align with calibration  
line and tighten knob.  
C. Set knob to 2 minute setting. Adjust “max” pot. On conveyor control to 219 Hz.  
D. Set control knob to 20 minute setting, and adjust “min” pot. On conveyor control to 21.9 Hz.  
Recheck at 2 minute and 20 minutes until proper readings are achieved. seal pots with  
glyptol or nail polish.  
CIRCUIT BREAKER  
A. Shut off power at main breaker.  
B. Remove control top and front panel.  
C. Disconnect 2 wires from circuit breaker.  
D. Remove knurled mounting nut and push out.  
E. Reassemble in reverse order.  
NOTE: Be sure to reset breaker before operation.  
CONVEYOR DRIVE MOTOR – REPLACEMENT  
A. Shut off power at main breaker.  
B. Remove conveyor.  
C. Remove control panel top and front cover.  
D. Disconnect wiring from motor and mark for reassembly.  
E. Remove sprocket from motor shaft.  
F. Remove 4 screws and remove conveyor motor and mounting bracket.  
G. Remove mounting bracket from conveyor motor assembly.  
H. Reassemble in reverse order.  
REVERSING CONVEYOR DIRECTION  
A. Shut off power at main breaker.  
B. Remove control panel top .  
C. Reverse wires fastened to terminals A+ and A- on conveyor control board.(See schematic  
diagram for wire numbers)  
D. Reassemble in reverse order.  
HALL EFFECT SENSOR – REPLACEMENT  
A. Shut off power at main breaker.  
B. Remove control panel top and front cover.  
C. Remove conveyor motor assembly.  
D. Remove wire connector from hall affect sensor board.  
E. Remove 2 screws from conveyor drive motor.  
F. Remove sensor board from mounting bracket.  
G. Reassemble in reverse order.  
FUSEHOLDER – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires, note wire number and location.  
C. Remove lock nut on back side of fuse holder and push out.  
D. Reinstall in reverse order and check system operation.  
GAS VALVE – REPLACEMENT AND ADJUSTMENT  
A. Remove appropriate control box cover .  
B. Disconnect the gas piping from the back of the unit.  
C. Remove the 4 screws from the incoming nipple mounting bracket.  
D. Remove incoming nipple.  
E. Disconnect 2 plugs (1) 3prong and (1) 4 prong – note location.  
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F. Disconnect pipe union just above gas valve and remove assembly.  
G. Reassemble in reverse order (check all pipe fittings for leaks ). After assembled check for  
proper adjustment of gas pressure switch, 10 on dial for natural gas, 27 for L.P. gas, and 4.5  
for town gas.  
H. Check and adjust manifold pressure. Remove pressure tap located in gas piping above the  
gas valve prior to the burner orifice and install manometer. Adjustment screw is located on  
the front of the valve, remove plastic cap and adjust as needed : 3.5” W.C. for natural gas,  
10” W.C. for L.P. and 2.0” W.C. for town gas.  
I. Check gas filter by removing cover plate (located on either side of valve ) . Remove 4 screws  
and slide filter out of valve housing and inspect. Reassemble in reverse order and check for  
leaks around cover.  
BURNER ALARM - REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires from alarm , note wire numbers and location.  
C. Remove retainer cover from alarm and remove assembly from control box.  
D. Reassemble in reverse order and check system operation.  
SPARK GENERATOR – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires for spark generator.  
C. Unplug connector on bottom of spark generator.  
D. Remove 2 mounting screws and remove generator assembly.  
E. Reassemble in reverse order and check system operation.  
IGNITER SENSOR – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove gas valve assembly ( see gas valve )  
C. Remove screws from burner tube and pull burner assembly out.  
D. Remove wire connectors from igniter sensor assembly.  
E. Remove screws from mounting bracket and remove assembly.  
F. Reassemble in reverse order and check system operation.  
NOTE: After installation, check all pipe fittings for leaks.  
SWITCH, BURNER RESET – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Disconnect wires from ignition control (see ignition control ). Note wire number and location  
for reassembly.  
C. Pull off black operating knob and remove hex mounting nut.  
D. Reassemble in reverse order.  
TEMPERATURE REGULATING VALVE – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove bypass tube assembly.  
C. Remove 4 nuts from burner orifice bracket.  
D. Disconnect pipe union.  
E. Disconnect 2 wires from valve and remove assembly.  
F. Remove gas piping from old valve and install on new valve.  
G. Reassemble in reverse order and check system operation. NOTE: Check all gas line fittings  
for leaks and insure valve gas flow is in proper direction.  
MAIN ORIFICE – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove bypass tube assembly.  
C. Remove 4 nuts from burner orifice bracket.  
D. Disconnect pipe union.  
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Low Profile – 1600 Advantage Series Service Manual – International  
E. Remove assembly and replace main orifice.  
F. Reassemble in reverse order and check system operation.  
NOTE: Check all gas line fittings for leaks.  
TEMPERATURE CONTROL POTENTIOMETER – REPLACEMENT  
A. Remove control box cover.  
B. Loosen screw and slide knob off potentiometer shaft.  
C. Remove lock nut and push out.  
D. Remove 3 wires from electronic temperature control, note wire color and location for  
reinstallation.  
E. Reassemble in reverse order and check system operation.  
THERMOSTAT, HIGH LIMIT, OVEN CAVITY – REPLACEMENT  
A. Remove appropriate control box cover. Remove motor cover and remove oven back to  
access high limit thermostat.  
B. Remove wires from thermostat, note wire numbers for reinstallation.  
C. Remove mounting nut from high limit thermostat and remove high limit from oven.  
D. Reassemble in reverse order. Check system operation.  
ON-OFF SWITCH – REPLACEMENT  
A. Remove control box cover.  
B. Depress spring clips on side of switch and push out.  
C. Remove wires from back of switch, note wire number and location.  
D. Reassemble in reverse order and check system operation.  
NOTE: Make sure switch housing is fully seated in control box housing.  
DUAL TEMPERATURE DISPLAY – REPLACEMENT  
A. Shut off power at main breaker.  
B. Remove control panel top and front cover.  
C. Remove all wires from temperature display and mark wires for reassembly.  
D. Pry temperature display to remove from mounting tabs (this is a pressure fit  
E. Reassemble in reverse order.  
CALIBRATE TEMPERATURE  
A. (see page 16 for connection of temperature sensor ) Set temp. control to 500° F .  
Allow temperature to stabilize.  
B. “ Fine tune “ temperature setting to achieve measured temperature swings from 497°F to  
503°F. When actual temperature falls between 497°F and 503°F, the display must show  
500°F.  
C. Adjust temp. adj. Pot. on temp display to achieve a display reading of 500°F.  
TRANSFORMER, TEMPERATURE DISPLAY – REPLACEMENT  
A. Remove control box cover and front panel.  
B. Remove 5 wires (2 primary side, 3 secondary side ), note color and location of wires for  
reinstallation.  
C. Remove 2 screws from transformer base and replace assembly.  
D. Reassemble in reverse order and check system operation.  
Low Profile – 1600 Advantage Series Service Manual – International  
15  
CAPACITOR, MAIN FAN MOTOR – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires from capacitor, note wire number and location.  
C. WARNING: Capacitor has a stored charge, discharge before handling or testing.  
D. Cut 2 tyraps securing capacitor to base and replace.  
E. Reinstall in reverse order and check system operation.  
RELAY – REPLACEMENT  
A. Remove control box cover.  
B. Remove wires from relay, note wire numbers and location for reinstallation.  
C. Remove 2 screws from relay base and replace relay.  
D. Reassemble in reverse order making sure wire connections are properly seated.  
E. Check system operation.  
THERMOSTAT, COOLING FAN – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires from thermostat, note wire number and location.  
C. Remove 2 mounting screws and replace thermostat.  
D. Reassemble in reverse order and check system operation.  
ELECTRONIC TEMPERATURE CONTROL – REPLACEMENT  
A. Remove control box cover and front panel.  
B. Identify correct control and remove wires from control. Note wire number  
C. and location for reinstallation.  
D. Remove temperature control from mounting tabs.  
E. Reassemble in reverse order and check system operation.  
TEMPERATURE SETTING FOR NEW TEMPERATURE CONTROL BOARD  
PROCEDURE FOR SETTING MAXIMUM TEMPERATURE POTENTIOMETER  
NOTE: When replacing temp. control, turn oven temperature control to its maximum heat position  
and allow 30 minute preheat before calibrating. Connect temperature probe to the oven  
thermocouple leads at the temperature control board and adjust potentiometer to a maximum  
temperature of 600°F.(see diagram above )  
HIGH LIMIT THERMOSTAT – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 2 wires from thermostat, note wire numbers and location for reinstallation  
C. Remove screws from bracket and remove thermostat.  
D. Reassemble in reverse order and check system operation.  
NOTE: Depress reset button to insure thermostat is set for operation.  
COOLING FAN MOTOR – REPLACEMENT  
A. Remove appropriate control box cover.  
B. Remove 4 mounting screws.  
C. Unplug electrical connector and remove fan motor.  
D. Reassemble in reverse order and check system operation.  
MAIN FAN MOTOR – REPLACEMENT  
A. Shut off gas supply and remove gas line and manifold lines from back of oven.  
B. Remove screws from motor cover housing and lift off.  
NOTE: When ovens are stacked, all motor cover housings are fastened together.  
C. Unplug power connector.  
D. Unplug thermocouple.  
E. Unplug 2 motor connectors.  
F. Remove 8 bolts from oven back ( 4 left, 4 right ) and lift out.  
G. Remove 1 screw from fan hub and slide fan blade off of motor shaft.  
16  
Low Profile – 1600 Advantage Series Service Manual – International  
H. ( note location of fan blade for reinstallation )  
I. Loosen lock nuts on cone. Remove 2 mounting bolts and remove motor from  
J. back assembly.  
K. Remove 4 hex head screws from motor mount bracket. Remove motor mount from motor and  
reinstall on new motor.  
L. Reassemble in reverse order.  
M. NOTE: 1. Make sure motor is centered in back housing.  
N. 2. Verify correct location of fan blade and that it is not hitting fan shroud.  
O. 3. Make sure all connectors are properly seated and making good contact.  
P. 4. When reinstalling gas manifold across back of oven, check all fittings for leaks.  
Q. Check system operation ( allow 30 minute preheat for all checks ) NOTE: Position of the fan  
on the motor shaft will be 1.875” from the top of the oven back cone to the blade spider  
assembly on the fan hub. ( see drawing below ).  
THERMOCOUPLE ( TYPE J ) – REPLACEMENT  
A. Remove control box covers. Remove motor cover and remove oven back to access  
thermocouple.  
NOTE: Removal of oven back assy. Is required to replace thermocouples.  
B. Remove thermocouple from wire form in oven chamber and remove from chamber. NOTE: R.  
H. thermocouple ( viewed from front ) is connected directly to the temperature control board,  
remove 2 wires , make note of wire colors and location. When changing L. H> thermocouple (  
viewed from front , the back motor cover must also be removed to gain access to the  
thermocouple connector plug.  
C. Reassemble in reverse order making sure bulb is placed securely in the wire form in the oven  
chamber.  
D. Check system operation, recalibrate as needed. NOTE: The R. H. and L. H. thermocouples  
have different connectors on the wire ends and must be ordered accordingly.  
INFORMATION :  
When two wires composed of dissimilar metals are joined together and one of the ends is heated,  
a continuous current flow as generated. We use an iron constant ( type J ) thermocouple. The  
iron wire increases the number of dissimilar junctions.  
It is possible to check a thermocouple with a properly calibrated D. C. millivolt meter. At 32°F, the  
millivolt reading should be 0.00. This can be checked by inserting the thermocouple into an ice  
bath.  
The millivolt reading at 72°F should be 1.134.  
When using the following chart, the temperature at the terminal connections must be noted. This  
temperature is called the junction temperature.  
Low Profile – 1600 Advantage Series Service Manual – International  
17  
The following chart lists the thermocouple millivolt readings from 200°F to 600°F.  
O
V
E
N
T
E
M
P
200°F 250°F 300°F 325°F 350°F 400°F 425°F 450°F 500°F 550°F 600°F  
90°F  
88°F  
86°F  
84°F  
82°F  
80°F  
78°F  
76°F  
75°F  
74°F  
72°F  
70°F  
68°F  
66°F  
64°F  
62°F  
60°F  
3.26  
3.32  
3.37  
3.43  
3.49  
3.55  
3.60  
3.66  
3.69  
3.72  
3.78  
3.83  
3.89  
3.95  
4.01  
4.06  
4.12  
4.77  
4.83  
4.88  
4.94  
5.00  
5.06  
5.11  
5.17  
5.20  
5.23  
5.29  
5.34  
5.40  
5.46  
5.52  
5.57  
5.63  
6.30  
6.36  
6.41  
6.47  
6.53  
6.59  
6.64  
6.70  
6.73  
6.76  
6.82  
6.87  
6.93  
6.99  
7.05  
7.10  
7.16  
7.06  
7.12  
7.17  
7.23  
7.29  
7.35  
7.40  
7.46  
7.49  
7.52  
7.58  
7.63  
7.69  
7.75  
7.81  
7.86  
7.92  
7.83  
7.89  
7.94  
8.00  
8.06  
8.12  
8.17  
8.23  
8.26  
8.29  
8.35  
8.40  
9.37 10.14 10.91 12.46 14.00 15.53  
9.43 10.20 10.97 12.51 14.05 15.59  
9.49 10.26 11.03 12.57 14.11 15.65  
9.54 10.31 11.09 12.63 14.19 15.71  
9.60 10.37 11.14 12.69 14.23 15.76  
9.66 10.43 11.20 12.74 14.28 15.82  
9.72 10.49 11.26 12.80 14.34 15.86  
9.77 10.55 11.32 12.86 14.40 15.94  
9.80 10.57 11.35 12.89 14.43 15.97  
9.83 10.60 11.37 12.92 14.46 15.99  
9.89 10.66 11.43 12.97 14.51 16.05  
9.95 10.72 11.49 13.03 14.57 16.11  
J
U
N
C
T
I
O
N
T
E
M
P
8.46 10.00 10.78 11.55 13.09 14.63 16.17  
8.52 10.06 10.83 11.61 13.15 14.69 16.23  
8.58 10.12 10.89 11.66 13.20 14.74 16.28  
8.63 10.18 10.95 11.72 13.26 14.80 16.34  
8.69 10.24 11.01 11.78 13.32 14.86 16.40  
BEARING, CONVEYOR – REPLACEMENT  
A. Remove conveyor from oven and place on a flat work surface.  
B. Remove connecting links from conveyor belting. See Installation and Operating Instructions  
Manual.  
C. Remove conveyor belting from conveyor. Remove drive sprocket from drive shaft.  
D. Move drive shaft or idle shaft toward end of conveyor, and shaft with bearings will now slip  
out of holding bracket.  
E. Replace bearing and reassemble in reverse order.  
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Low Profile – 1600 Advantage Series Service Manual – International  
19  
GENERAL PARTS  
ADVANTAGE SERIES  
LETTER  
PART #  
DESCRIPTION  
A
B
C
D
E
F
G
H
I
369110  
369929  
369926  
369925  
369927  
369930  
369211  
369058  
370253  
1609  
370252  
369745  
369723  
369783  
369717  
369057  
369501  
369238  
369030  
369390  
370167  
370663**  
370166  
370662**  
370168  
370665***  
370169  
370664***  
Access window assembly  
Window retainer  
Window frame bottom  
Glass, access window  
Window frame, top  
Screw, 10-32x1/4  
Thumb screw  
Baffle  
Drive cover, L.H.  
J
Oven top  
K
L
Drive cover, R.H.  
Hinge assy., right  
M
N
O
P
Q
R
S
Door assy., small  
Latch, spring  
Finger retaining bracket  
Screw, finger retaining bracket  
Latch  
Leg  
Caster, High stand  
Caster, Low stand  
T
U
V
Baffle, air return U.L., L.R. (S/N 35950 & Below)  
Baffle, air return U.L. (S/N 35951 & Above)  
Baffle, air return U.R., L.L. (S/N 35950 & Below)  
Baffle, air return U.R. (S/N 35951 & Above)  
Finger housing T-1, T-3, B-2, B-4 (S/N 35950 & Below)  
Finger housing T-1, T-3, B-2, B-4 (S/N 35951 & Above)  
Finger housing T-2, T-4, B-1, B-3 (S/N 35950 & Below)  
Finger housing T-2, T-4, B-1, B-3 (S/N 35951 & Above)  
Columnating plates- see Installation  
Operations manual.  
W
X
369707  
369740  
369718  
369931  
369746  
Finger cover  
Handle assy.  
Y
Z
Door assy. , large  
AA  
BB  
Screw, 8-32x3/8  
Hinge assy. , left  
** Units from S/N 35951 and above DO NOT contain lower Air Return Baffles. These units only contain  
a total of two (2) Air Return Baffles which are placed above the top finger assemblies.  
*** These parts have minor design changes not shown in the exploded view drawing on page 21.  
20  
Low Profile – 1600 Advantage Series Service Manual – International  
Low Profile – 1600 Advantage Series Service Manual – International  
21  
CONTROL BOX, RIGHT PARTS  
1633-000-EA, 1634-000-EA  
LETTER  
PART#  
DESCRIPTION  
A
B
C
369158  
369705  
369757  
369758  
370186  
369590  
369937  
369773  
369401  
369589  
369580  
370031  
369557  
369173  
369571  
370296  
367378  
369575  
369154  
369192  
357107  
369013  
369014  
369507  
369431  
370177  
369465  
369573  
369856  
369422  
369810  
369823  
369824  
369822  
370244  
370251  
370058  
370249  
370256  
369467  
369449  
369809  
370277  
369432  
369316  
Sprocket, 10 tooth  
Thermocouple  
Main orifice, Nat.  
Main orifice, L.P.  
Solenoid valve  
Igniter/sensor assy.  
Venturi, Nat.  
Venturi, L.P.  
Air shutter assy.  
Burner blower motor  
Gas valve  
By-pass orifice, Nat.  
By-pass orifice, L.P.  
Transformer, temp. display  
Connector  
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
Wire hanger  
Cooling fan  
Air pressure switch  
Circuit breaker .7A  
Capacitor  
Fuse holder  
Fuse, 3A  
Fuse, 10A  
T
Thermostat, cooling fan  
Thermostat, control box hi-limit  
Conveyor control  
Temperature control  
Ignition control  
U
V
W
X
Y
Support stand-off  
Relay  
Cable, hall effect sensor  
Hall effect sensor  
Bracket, hall effect sensor  
Magnet, 8 pole  
Conveyor motor assy. (includes BB,CC,DD)  
Control box top, R.H.  
Jumper, thermocouple  
Temperature display, dual  
Side panel, R.H.  
Pilot light, 250V.  
Temperature control pot. assy.  
Conveyor pot. assy.  
Knob guard  
Z
AA  
BB  
CC  
DD  
EE  
FF  
GG  
HH  
II  
JJ  
KK  
LL  
MM  
NN  
OO  
Switch on/off  
Knob  
22  
Low Profile – 1600 Advantage Series Service Manual – International  
Low Profile – 1600 Advantage Series Service Manual – International  
23  
CONTROL BOX, LEFT PARTS  
1633-000-EA, 1634-000-EA  
LETTER  
PART#  
DESCRIPTION  
A
B
C
D
E
F
G
H
I
369706  
369507  
369431  
369573  
369771  
357107  
369014  
369368  
369378  
369192  
370296  
369575  
369025  
369580  
369571  
369589  
369590  
369937  
369773  
369757  
369758  
369689  
370186  
370031  
369557  
369574  
370272  
370250  
369579  
Thermocouple with extension  
Thermostat, cooling fan  
Thermostat, control box hi-limit  
Ignition control  
Reset switch, ignition control  
Fuse holder  
Fuse, 10A  
Thermostat, hi-limit  
cooling fan  
Capacitor  
Wire hanger  
J
K
L
Air pressure switch  
Air pressure switch  
Gas valve  
M
N
O
P
Q
R
Connector  
Burner blower motor  
Igniter/ sensor assy.  
Venturi, Nat.  
Venturi, L.P.  
S
Main orifice, Nat.  
main orifice, L.P.  
Pressure tap fitting  
Solenoid valve  
T
U
V
By-pass orifice, Nat.  
By-pass orifice, L.P.  
Spark generator  
Side panel, L.H.  
Control box top, L.H.  
Alarm  
W
X
Y
Z
24  
Low Profile – 1600 Advantage Series Service Manual – International  
Low Profile – 1600 Advantage Series Service Manual – International  
25  
OVEN BACK PARTS  
1633-000-EA, 1634-000-EA  
LETTER  
PART#  
DESCRIPTION  
A
B
C
D
E
F
G
H
I
369547  
369724  
369776  
369777  
369778  
369761  
369759  
1627  
369033  
370245  
370246  
368725  
369085  
369376  
353082  
369698  
370184  
Wire form thermostat bulb  
Fan, clockwise rotation  
Fan shroud  
Stand-off  
Rear wall assy.  
Motor mount  
Motor, main fan 220/240V 50 Hz.  
Duct cap  
Motor clamp  
J
Rear duct  
K
L
M
N
O
P
Q
Manifold assy.  
Fan, counter-clockwise rotation  
Junction box  
Terminal block 3-pole  
Ground lug  
Cover, junction box  
Filter, RFI  
26  
Low Profile – 1600 Advantage Series Service Manual – International  
Low Profile – 1600 Advantage Series Service Manual – International  
27  
CONVEYOR PARTS  
1633-000-EA, 1634-000-EA  
LETTER  
PART#  
DESCRIPTION  
369830  
369816  
369825  
369813  
369314  
369812  
369160  
369814  
369811  
369161  
369806  
370050  
369162  
Complete conveyor  
Conveyor belting  
Belt, 1ft. section  
Conveyor bearing block  
Roll, conveyor, notched  
Conveyor idler shaft  
Conveyor pan stop  
Connecting link  
Conveyor drive shaft  
Roller chain sprocket  
Crumb pan  
Conveyor frame  
Drive chain  
A
B
C
D
E
F
G
H
J
K
L
M
28  
Low Profile – 1600 Advantage Series Service Manual – International  
Low Profile – 1600 Advantage Series Service Manual – International  
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Low Profile – 1600 Advantage Series Service Manual – International  
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Low Profile – 1600 Advantage Series Service Manual – International  

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