Lincoln 1600-000-A, 1601-000-A User Manual

SERVICE MANUAL

(DOMESTIC)

IMPINGER CONVEYOR OVENS

MODEL 1600-000-A, 1601-000-A

WITH PUSH BUTTON CONTROLS

Lincoln Foodservice Products, LLC

1111 North Hadley Road

Fort Wayne, Indiana 46804

United States of America

Phone : [phone]

U.S. Fax: [phone] • Int’l Fax: [phone]

Technical Service Hot Line

[phone]

www.lincolnfp.com

1600AdvDigSvc REV: 1/8/07

SEQUENCE OF OPERATIONS / 1600-000-A, 1601-000-A

SERIAL NUMBERS L28563 and ABOVE

(with push button control)

MODEL 1600-000-A / 120 VAC / 60 HZ / NATURAL GAS

MODEL 1601-000-A / 120 VAC / 60 HZ / L.P. GAS

POWER SUPPLY Electrical power to be supplied to the oven by a three conductor cordset. Voltage from

the black conductor to the white conductor to be 120 VAC.
White conductor is Neutral.

Green conductor is Ground.
CONTROL BOX AUTO
COOL DOWN

MAIN FAN CIRCUIT 120 VAC is permanently supplied to the normally open Power Switch, both normally

BURNER CIRCUIT Closing the Oven Power Relay supplies 120 VAC to the two burner systems.

TEMPERATURE
CONTROL

CONVEYOR DRIVE Closing the main Power Switch supplies 120 VAC through the Oven Power Relay to

When the temperature in either one of the Control Boxes reaches 120° F ± 3° F (49° C

± 1.7° C), the Cooling Fan Thermostats will switch power to the Cooling Fans. The

thermostats will interrupt the power to the Cooling Fans when temperature falls to

100° F ± 3° F (37° C ± 1.7° C).

open Cooling Fan Thermostats, and one of the normally open contacts of the Power

Relay. Closing the normally open Power Switch supplies 120 VAC through the Cooling

Fan Motor Fuse, and through both normally closed control box Hi-limit Thermostats

energizing the coil of the Oven Power Relay. These normally open contacts now close

supplying 120 VAC through the 10 Amp Main Fan Motor Fuse to the two Main Fan

Motors and the two Burner Motors. Power is also supplied to the four cooling fan

motors, the Control Transformer, heat, and conveyor control systems.

NOTE: This oven utilizes two complete burner systems. The sequence of operations is

the same for each system. 120 VAC is supplied through the Centrifugal Switch of the

Main Fan Motor (this switch closes when the Main Fan reaches approximately 1600

R.P.M.) through the 10 Amp Fuse, to the Ignition Control, the oven Temperature

Control, and the Burner Transformer. As the Burner Blower reaches approximately

1600 R.P.M., its internal Centrifugal Switch will close, supplying 24 VAC to the Ignition

Control. The Ignition Control operates on both 24 VAC and 120 VAC. When the Ignition

Control is energized by 24 VAC, 120 VAC is switched to the Hot Surface Igniter for 45

seconds for Hot Surface Igniter warm up. The igniter glows red, 24 VAC is switched to

the Gas Valve which opens, and ignition should occur. If ignition does not occur in 6

seconds, the control will lock out. To recycle after lockout, turn the Power Switch off for

45 seconds and then turn back on.

When the Centrifugal Switch of the Main Motor Fan closes, power is applied to the

oven Control. The Oven Control is set to the desired temperature. The thermocouple

will provide varying millivolts to the Oven Control. The Oven Control supplies 120 VAC

to the Temperature Regulation Valve at intermittent intervals to maintain the desired

temperature. The display on the Oven Control will indicate when the Temperature

Control Valve is energized.

NOTE: The display also indicates oven temperature.

the Conveyor Motor and to the primary of the Control Transformer. Secondary voltage,

24 VAC, is supplied to the Oven Control. Setting the Control to the desired time outputs

voltage through a Reversing Switch to the Conveyor Motor.

NOTE: The conveyor system uses a Magnet and a Hall Effect Sensor to prove

operation of the Conveyor Motor. If the Conveyor Motor is not running, “BELT JAM” is

indicated on the display.

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SCHEMATIC DIAGRAM

1600-000-A, 1601-000-A SERIAL NUMBER L28563 AND ABOVE

Low Profile – 1600 Series Advantage Digital Service Manual – Domestic

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TROUBLESHOOTING GUIDE

normally closed. If open, reset and test oven for proper operation.

check to insure contacts are closing. Check for 120 VAC supplied

No automatic control box

GAS OVENS

MODEL 1600-000-A NATURAL GAS 120 VAC. 60 HZ. 1 PHASE
MODEL 1601-000-A LP GAS 120 VAC. 60 HZ. 1 PHASE

NOTE: When checking components on left side of oven, 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

Power switch Check continuity between switch terminals. Replace switch as

Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Fuse, 3 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat(s),

control box

Relay, oven power Check for 120 VAC to the relay coil. If voltage is not present,

Check circuit breakers, reset if required. Check power plug to be
sure it is firmly in receptacle. Measure the incoming voltage. Call
power co. if needed.

needed.

Check for voltage on both sides of the switch. Terminals are

If thermostat will not hold, and control box temperature is not
exceeding 140°F (60°C), replace thermostat

Trace wiring back to the hi-limit thermostat. If voltage is present,

to terminal #2 of the relay. If voltage is not present at terminal #2,
trace wiring back to the 10 Amp fuse. Replace relay as needed.

Motor, main fan Check for opens, shorts or grounds. WITH POWER OFF: turn

fan blade to check for locked rotor.

Capacitor Check for shorts or grounds. WARNING: Capacitor has a stored

charge, discharge before testing.

No control box cooling Incoming power Check circuit breakers, reset if required. Check power plug to be

sure it is firmly in receptacle. Call power co. if needed.

Power switch Check continuity between switch terminals. Replace switch as

needed.
Fuse, 3 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat(s),

control box

Cooling fan(s) 120 VAC should now be at the fan motor. If voltage is not

Incoming power
cooling
Cooling fan

Fuse, 3 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat(s)

supply

thermostat(s)

control box

Check for voltage on both sides of the switch. Terminals are
normally closed. If open, reset and test oven for proper
operation. If thermostat will not hold and control box temperature
is not exceeding 140°F (60°C), replace thermostat.

present, trace wiring back to hi-limit thermostat. Check motor for
opens, shorts or grounds. WITH POWER OFF: Check for locked
rotor.
Check circuit breakers, reset if required. Check power plug to be
sure it is firmly in receptacle. Call power co. if required.

Check the cooling fan thermostat. (thermostat closes at 120°F
and opens at 100°F) With the cooling fan thermostat preheated,
check for continuity. If switch is open, replace thermostat.

Check for voltage on both sides of switch. Terminals are
normally closed. If open, reset and test oven for proper
operation. If thermostat will not hold, and control box

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temperature is not exceeding 140° F (60°C), replace thermostat.

Cooling fan(s) 120 VAC should be at the motor. If voltage is not present, trace

wiring back to hi-limit thermostat. Check motor for opens, shorts
or grounds. WITH POWER OFF: Check for locked rotor.

Oven will not heat Gas supply Check for adequate gas supply and closed manual gas valves.

Also check flexible gas line connection for any damage.
Main fan If not operating, refer to “Oven fan will not run”.
NOTE: These ovens utilize 2 complete burner/temperature control systems. Each system will follow the same
troubleshooting sequence.
Oven power relay Check for 120 VAC to the relay coil. If voltage is not present,

trace wiring back to the control box hi-limit. If voltage is present,

check to insure contacts are closing. Check for 120 VAC

supplied to terminal #6 of the relay. If voltage is not present at

terminal #6, trace wiring back to the power source. Replace

relay as needed.
Centrifugal switch of

main fan motor

Check for 120 VAC supplied to the centrifugal switch. If no

voltage is present, trace wiring back to the oven power relay. If

voltage is supplied to the centrifugal switch, and the motor is

running, but there is no voltage out of the centrifugal switch,

replace the main fan motor.

NOTE: See schematic diagram for proper wire numbers on

motors.
Fuse, burner 10Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Burner blower motor Check for 120 VAC supplied to burner blower motor. If voltage is

not present, trace wiring back to oven power relay. If voltage is

present and motor does not run, replace burner blower motor.

WITH POWER OFF: Check for locked rotor.
Burner transformer Check for 120 VAC to the primary of the 24 VAC burner

transformer. If voltage is not present, trace wiring back to the

burner fuse. If voltage is present, check for 24 VAC at the

transformer secondary. If no secondary voltage is present,

replace the transformer.
Centrifugal switch of

burner blower motor

Check for 24 VAC to the centrifugal switch of burner blower

motor (see schematic diagram for proper wire numbers). If no

voltage is present, trace wiring back to the burner transformer. If

voltage is present, check for 24 VAC at the output of the

centrifugal switch. If there is no output, and the burner blower

motor is running, replace the burner blower motor.
Ignition control Check for 24 VAC supply to the ignition control at terminals 24V

and 24Vgnd. If voltage is not present, trace wiring back to the

centrifugal switch. Check for 120 VAC supply to the ignition

control at terminals L1 and L2. If no voltage is present, trace

wiring back to burner fuse. If the above checks are okay,

proceed. The ignition control should switch 120 VAC to the hot

surface igniter, across the two terminals marked HSI. If no

voltage is present, replace the ignition control.
Hot surface igniter

(located inside
burner assy.

If 120 VAC is present at HSI terminals, visually check to see that

the hot surface igniter is heating (igniter may be viewed through

port in the end of burner tube). The igniter should glow bright

red. Check all connections to be sure they are tight. If the igniter

does not heat, replace hot surface igniter.

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Ignition control After 45 seconds of hot surface igniter pre-heat, the ignition

control will switch 24 VAC to the gas control valves. Check for

24 VAC output from the ignition control, across terminals

marked “valve” and “valve gnd”. If no voltage is present, replace

the ignition control.

NOTE: The ignition control contains a safety lockout circuit. If a

flame is not detected within 6 seconds after the gas control

valve is energized, the ignition control will lockout. To reset, turn

the power switch “off”, wait 45 seconds and switch the system

“on” to retry ignition.
Gas control valves Check for 24 VAC supplied to the gas control valves. If voltage

is present, the valves should open. Check for gas pressure at

the pressure tap, located in the gas piping just prior to the

burner. If there is no gas pressure, and the voltage is supplied to

the valves, check piping for obstructions. If there are no

obstructions, replace gas control valves.
Flame will not stay lit Hot surface igniter The ignition control will keep the gas control valves energized

for 6 seconds. At the end of 6 seconds, the hot surface igniter

must sense a flame, or the ignition control will go into lockout.

(The ignition control requires a minimum of 0.8 micro-amps DC)

To check the flame sensing operation, connect a digital

multimeter (capable of measuring DC micro-amps) between the

“GND burner” terminal on ignition control and the ground wire.

NOTE: This is a current measurement and the meter must be

connected in series.

If these readings are not achieved, check bypass orifice for

obstructions, if bypass orifice is clear, replace the hot surface

igniter.

NOTE: The DC micro-amp test must be conducted with the oven

in low flame (bypass) operation. Set the temperature control to

its lowest setting.
Power supply If there is sufficient micro-amp current, but the flame will not stay

lit, check for proper polarity of the 120 VAC power supply.
Ignition control If there is sufficient micro-amp current, and the 120 VAC polarity

is correct, but the flame will not stay lit, replace the ignition

control.

NOTE: check for proper ground connection of the ignition

control.
NOTE: Flame should

be lit at this time
Low flame is on, but no
main flame

Control transformer Check for 120 VAC supply to the primary of the control

transformer. If no voltage is present, trace wiring back to the
oven power relay. If voltage is present, check for 24 VAC at the
transformer secondary. If there is primary voltage but no
secondary voltage, replace control transformer.

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Oven control Check for 24 VAC supply to control. If no voltage is present,

trace wiring back to control transformer. If 24 VAC is present,
check for a read-out on the control display. If there is 24 VAC
supplied, but there is no read-out on the control display, replace
the 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 120 VAC at 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 control. If the control reads “LP FAIL”
or “RP FAIL”, this indicates that the thermocouple has failed or
has become disconnected from the control. “LP FAIL” indicates
a problem with the left thermocouple probe, and “RP FAIL”
indicates a problem with the right thermocouple probe.

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 “LP FAIL” or “RP FAIL”,
disconnect the thermocouple from the oven control and measure
the resistance of the thermocouple. The left thermocouple
should read approx. 21Ω. The right 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 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 and burner

blower motors

The main fan motors and 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 heating systems to cycle on and off intermittently.
Improper ventilation or lack of preventive maintenance may
cause this problem. Also, most of the problem listed under
“Oven will not heat” can cause intermittent failure.

Conveyor will not run Power supply Check for incoming voltage at line 1 to neutral. There should be

a voltage reading of 120VAC. If not present, check circuit
breakers.

Power switch Check continuity between switch terminals. Replace switch as

needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.

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Hi-limit thermostat(s),

control box

Check for voltage on both sides of the switch. Terminals are

normally closed. If open, reset and test oven for proper

operation. If thermostat will not hold, and control box

temperature is not exceeding 140°F (60°C), replace thermostat
Relay, oven power Check for 120 VAC to the relay coil. If voltage is not present,

Trace wiring back to the hi-limit thermostat. If voltage is present,

check to insure contacts are closing. Check for 120 VAC

supplied to terminal #2 of the relay. If voltage is not present at

terminal #2, trace wiring back to the 10 Amp fuse. Replace relay

as needed.
Control transformer Check for 120 VAC supply to the primary of the control

transformer. If no voltage is present, trace wiring back to the

oven power relay. If voltage is present, check for 24 VAC at the

transformer secondary. If there is primary voltage but no

secondary voltage, replace control transformer.
Conveyor motor Check for 120 VAC supply to the conveyor motor at wire #14 to

neutral. If no voltage is present, trace wiring back to the primary

of the control transformer. If voltage is present and the 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 switch 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,
but there is no speed

NOTE: Display will

indicate “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 the
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.

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Low Profile – 1600 Series Advantage Digital Service Manual – Domestic