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-.
Low Profile – 1600 Advantage Series Service Manual – International
3
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.
4
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
5
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.
6
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
Low Profile – 1600 Advantage Series Service Manual – International
7
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
8
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
Low Profile – 1600 Advantage Series Service Manual – International
9
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
10
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.
Low Profile – 1600 Advantage Series Service Manual – International
11
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.
12
Low Profile – 1600 Advantage Series Service Manual – International
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.
Low Profile – 1600 Advantage Series Service Manual – International
13
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.
14
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.
18
Low Profile – 1600 Advantage Series Service Manual – International
This page intentionally left blank.
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
29
This page intentionally left blank.
30
Low Profile – 1600 Advantage Series Service Manual – International
This page intentionally left blank.
Low Profile – 1600 Advantage Series Service Manual – International
31
32
Low Profile – 1600 Advantage Series Service Manual – International
|