Lincoln 3240-2, 3270-2, 3262-2 User Manual

SERVICE MANUAL

(DOMESTIC & INTERNATIONAL)

IMPINGER X2 OVENS

WITH PUSH BUTTON CONTROLS

MODEL

3240-2, 3262-2, 3270-2

Lincoln Foodservice Products, LLC

1111 North Hadley Road

Fort Wayne, Indiana 46804

United States of America

Phone : (800) 374-3004

U.S. Fax: (888) 790-8193 • Int’l Fax: (260) 436-0735

Technical Service Hot Line

(800) 678-9511

www.lincolnfp.com

X2digservman REV: 1/7/08

SEQUENCE OF OPERATION

IMPINGER X2 OVENS - DOMESTIC

WITH PUSH BUTTON CONTROLS

3240-2* 230VAC 60 HZ. 1 PHASE 3240-2* 230VAC 60 HZ. 3 PHASE 3262-2* 230VAC 60 HZ. 1 PHASE 3262-2* 230VAC 60 HZ. 3 PHASE 3270-2* 230VAC 60 HZ. 1 PHASE 3270-2* 230VAC 60 HZ. 3 PHASE

*NOTE:

Model number ending in TS indicates top belt is split belt

Model number ending in SB indicates bottom belt is split belt

Model number ending in SS indicates both belts are split belts

POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service for single phase

or a four conductor service for three phase. Black conductor is hot. Red conductor is hot. Orange conductor is hot. Green conductor is ground.

MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the main fan relay.

Power is also supplied, through a 3 amp. fuse, to the 30 minute time delay relay. Closing the oven power switch enables the 30 minute time delay relay. The 30 minute time delay relay supplies line voltage to the coil of the main fan relay. These normally open contacts now close energizing the main fan motor. Closing the main power switch also supplies power to the burner and conveyor circuits.

BURNER CIRCUIT Closing the main power switch supplies line voltage to the oven control transformer. The

transformer’s secondary supplies 24VAC to the oven control and, through the burner blower air pressure switch, to the burner control. When the burner control is supplied with 24VAC, the pilot valve is energized and the igniter circuit is energized. Ignition should now occur. After the pilot flame is proven, the main gas valve is energized.

TEMPERATURE CONTROL Closing the main fan switch supplies line voltage to the oven control transformer. The

transformer’s secondary supplies 24VAC 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 line voltage to the temperature regulation valve at intermittent intervals to maintain desired temperature. The display on the oven control will indicate when the temperature regulation valve is energized. NOTE: The display also indicates oven temperature.

CONVEYOR DRIVE

AUTOMATIC COOL DOWN When the oven is started, the 30 minute time delay relay is enabled, permitting the oven

THE OVEN WILL CONTAIN BETWEEN TWO AND FOUR SEPARATE CONVEYOR DRIVE SYSTEMS. THE SEQUENCE OF OPERATIONS WILL BE THE SAME FOR EACH MOTOR SYSTEM. Closing the main fan switch supplies line voltage, to the conveyor motor and to the primary of the control transformer. Secondary voltage, 24VAC, is supplied to he oven control. Setting the oven control to the desired time, outputs voltage, through a reversing switch, to the conveyor motor. NOTE: The conveyor control uses a hall effect sensor and magnet to prove operation of the conveyor motor. If the conveyor motor is not running, “BELT JAM” is indicated on the display.

fan to operate for approximately 30 minutes after the oven is shut off, to cool the oven. When the oven is shut off, the 30 minute time delay relay will keep the coil of the main fan relay closed for 30 minutes, maintaining operation of the main fan motor.

Impinger X2 – Digital Service Manual – Dom & Int’l

SEQUENCE OF OPERATION

IMPINGER X2 OVENS - INTERNATIONAL

WITH PUSH BUTTON CONTROLS

3240-2* 230VAC 50 HZ. 1 PHASE 3262-2* 230VAC 50 HZ. 1 PHASE 3270-2* 230VAC 50 HZ. 1 PHASE

*NOTE:

Model number ending in TS indicates top belt is split belt

Model number ending in SB indicates bottom belt is split belt

Model number ending in SS indicates both belts are split belts

POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service for single phase

or a four conductor service for three phase. Black conductor is hot. Red conductor is hot. Orange conductor is hot. Green conductor is ground.

MAIN FAN CIRCUIT Power is permanently supplied to the normally open contacts of the main fan relay.

BURNER CIRCUIT Closing the oven power switch supplies line voltage, through the air pressure switch and

through the oven cavity hi-limit thermostat, to the burner control. The burner control supplies line voltage to the burner blower motor. The normally open air pressure switch closes upon sensing air pressure. The spark and pilot valve are now energi zed. Ignition should now occur. After the pilot flame is proven, the main gas valve is energized.

TEMPERATURE CONTROL Closing the main fan switch supplies line voltage, through a filter, to the oven control

transformer. The transformer’s secondary supplies 24VAC 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 line voltage to the temperature regulation valve at intermittent intervals to maintain desired temperature. The display on the oven control will indicate when the temperature regulation valve is energized. NOTE: The display also indicates oven temperature.

CONVEYOR DRIVE

AUTOMATIC COOL DOWN When the oven is started, the 30 minute time delay relay is enabled, permitting the oven

THE OVEN WILL CONTAIN BETWEEN TWO AND FOUR SEPARATE CONVEYOR DRIVE SYSTEMS. THE SEQUENCE OF OPERATIONS WILL BE THE SAME FOR EACH MOTOR SYSTEM. Closing the main fan switch supplies line voltage, through a filter, to the conveyor motor and, through a filter, to the primary of the control transformer. Secondary voltage, 24VAC, is supplied to he oven control. Setting the oven control to the desired time, outputs voltage, through a reversing switch, to the conveyor motor. NOTE: The conveyor control uses a hall effect sensor and magnet to prove operation of the conveyor motor. If the conveyor motor is not running, “STALL” is indicated on the display.

Impinger X2 – Digital Service Manual – Dom & Int’l

SCHEMATIC DIAGRAM MODELS 3240-2, 3262-2, 3270-2 60 HZ.

WITH PUSH BUTTON CONTROLS

Impinger X2 – Digital Service Manual – Dom & Int’l

SCHEMATIC DIAGRAM MODELS 3262-2, 3270-2 50 HZ.

WITH PUSH BUTTON CONTROLS

Impinger X2 – Digital Service Manual – Dom & Int’l

TROUBLESHOOTING GUIDE - DOMESTIC

3240-2* 230VAC 60 HZ. 1 PHASE 3240-2* 230VAC 60 HZ. 3 PHASE 3262-2* 230VAC 60 HZ. 1 PHASE 3262-2* 230VAC 60 HZ. 3 PHASE 3270-2* 230VAC 60 HZ. 1 PHASE 3270-2* 230VAC 60 HZ. 3 PHASE

*NOTE:

Model number ending in TS indicates top belt is split belt

Model number ending in SB indicates bottom belt is split belt

Model number ending in SS indicates both belts are split belts

SYMPTOM POSSIBLE CAUSE EVALUATION Oven fan will not run Incoming power supply Check circuit breakers. Reset if required. Call power

co. if needed. Fuse, 3 Amp, control Check, replace if necessary. Fuse holder Check, replace if necessary. Switch, oven fan Check continuity between switch terminals. Replace

switch as needed. 30 minute time delay relay Check for supply voltage to 30 minute time delay relay

at terminals #1 and #3. If no voltage is present, trace

wiring back to main power switch. If there is supply

voltage at terminals #1 and #3, check for output voltage

at terminals #2 and #3. If there is incoming voltage but

no output voltage, and the main power switch is on,

replace the 30 minute time delay relay. Relay, main fan Check for supply voltage to relay contacts, if no voltage

is present, trace wiring back to power supply. Check for

208/240VAC to the coil of the main fan relay. If no

voltage is present, trace wiring back to the 30 minute

time delay relay, check to be sure that the Overload

Protector contacts are closed. If contacts are open, see

“Overload Protector” below. If voltage is present, check

to insure relay contacts are closing. Replace relay as

needed. Overload protector, main fan Check to be sure overload contacts are closed. If not

closed, re-set overload. If contacts do not close,

replace overload protector. If contacts close, test for

proper operation. If the overload contacts do not stay

closed, and the amperage is below the overload

setting, replace the overload protector.

3240 should be set at 13A

3262 should be set at 18A

3270 should be set at 18A Main fan motor Check for supply voltage at motor. If no voltage is

present, trace wiring back to the overload protector.

WITH POWER OFF: Check for opens, shorts or

grounds. Turn motor shaft to check for locked rotor. Capacitor Check for shorts or grounds.

WARNING: Capacitor has a stored charge, discharge

before testing. Drive belt Check for loose or broken drive belt. Adjust motor for

proper belt tension (maximum of 3/8-inch deflection), or

replace drive belt as needed. Bearings, Fan shaft Check for any damage or excessive wear on the shaft

bearings. Replace bearings as needed. 6

Impinger X2 – Digital Service Manual – Dom & Int’l

Oven will not heat Gas supply Check for adequate gas supply to oven. Manual gas shut off valve Check to see that the manual gas shut off valve is

open. Also, check flexible gas line connection for any

damage. Main fan motor Check for main fan operation. If it is not operating, refer

to “Oven fan will not run”. Relay, main fan Check for 208/240VAC supplied to relay terminal #13.

If voltage is not present, trace wiring back to power

supply. If voltage is present, check for 208/240VAC at

terminal #14. If there is no voltage at terminal #14, and

the relay is energized, replace the main fan relay. Air pressure switch, Main fan

motor

Check for 208/240VAC to the air pressure switch. If no

voltage is present, trace wiring back to main fan switch.

This normally open switch should close when the main

fan is activated. Check air switch tube for blockage or

any obstructions, repair as needed. Refer to the

“Removal and installation” section for proper

adjustment of air pressure switch. Replace air pressure

switch as needed. Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset

thermostat and retest. If thermostat will not hold for

maximum oven temperature, and oven is not exceeding

temperature setting, check for proper location of

capillary bulb in its spring holder. If the capillary checks

okay, replace the hi-limit thermostat. Transformer, burner/control Check for 208/240VAC supplied to primary of

transformer. If no voltage is present, trace wiring back

to the main fan switch. If voltage is present, check for

24VAC at transformer secondary.

NOTE: This is a dual secondary transformer, it is

important to check BOTH 24VAC outputs.

If there is primary voltage but no secondary voltage,

replace burner/control transformer. Motor, burner blower Check for 208/240VAC supplied to the burner blower

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

hi-limit thermostat. If voltage is present, and the motor

is not turning, check for opens, shorts or grounds.

WITH POWER OFF: Check for locked rotor.

Replace burner blower motor as needed. Air pressure switch, burner

blower motor

Check for 24VAC to the air pressure switch. If no

voltage is present, trace wiring back to the

burner/control transformer. This normally open switch

should close when the burner blower motor is

activated. Check air switch tube for blockage or any

obstructions, repair as needed. Refer to the “Removal

and installation” section for proper adjustment of air

pressure switch. Replace air pressure switch as

needed. Burner control Check for 24VAC supply to the ignition control. If no

voltage is present, trace wiring back to centrifugal

switch of burner blower motor. If voltage is present,

check for 24VAC at pin #3 and ground (pilot valve).

NOTE: The Honeywell ignition control has a 30 second

pre-purge (time delay) built in. If voltage is not present,

replace ignition control. If the pilot valve is energized,

check to see that the high voltage igniter circuit is also

energized. To check, turn power off, disconnect the

igniter lead from the ignition control. Turn power on. If

no spark is visible, replace burner control. If a spark is

visible at burner control, proceed. Pilot valve Check for 24VAC supplied to pilot valve. If no voltage is

Impinger X2 – Digital Service Manual – Dom & Int’l

present, trace wiring back to burner control. If voltage is

present, check for gas pressure at the pilot line

connection. If no gas pressure is present during

ignition, check for any blockage in the assembly. If

there are no obstructions, and there is gas supplied to

the oven, replace the gas valve. No pilot flame If the ignition control is supplied with 24VAC and the

pilot valve and igniter circuits are energized, visually

check for a pilot flame. This may be done by looking

through the inspection view port on the end of the

burner. If no pilot flame is visible, check the pilot tube. Pilot tube Check for gas pressure at the pilot tube. Disconnect

pilot tube at the burner And connect manometer to pilot

tube. If no gas pressure is present during ignition,

check for blockage of the pilot tube. If the pilot tube is

clear, proceed. Pilot orifice If there is gas pressure at the pilot tube, check the pilot

orifice for blockage or obstructions. Replace pilot orifice

as needed. Burner igniter Check the burner igniter head for any damage or

obstructions also check for frayed or broken wire.

Check spark gap, gap should be 3/32” If there is visible

damage, replace burner igniter. NOTE: Flame should be

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

Transformer, burner/control Check for 208/240VAC supplied to primary of

transformer. If no voltage is present, trace wiring back to the main fan switch. If voltage is present, check for 24VAC at transformer secondary. NOTE: This is a dual secondary transformer, it is important to check BOTH 24VAC outputs. If there is primary voltage but no secondary voltage, replace burner/control transformer.

Oven control Check for 24VAC supply to oven control. If no voltage

is present, trace wiring back to control transformer. If 24VAC is present, check for a read-out on the display. If there is 24VAC supplied, but there is no read-out on the display, replace oven control. If there is a read-out on the control, set the control to maximum temperature (see Installation operations manual for temperature adjustment). With the control set at maximum temperature, check for 208/240VAC at the temperature regulation valve. If there is voltage at the temperature regulation valve, proceed to “Temperature regulation valve” for next check. If there is no voltage at the temperature regulation valve, trace wiring back to the oven control. If there is no voltage output at the oven control, check the read-out on the oven control. If the control reads “PROBE FAIL”, this indicates that the thermocouple has failed or become disconnected from the oven control.

Thermocouple probe Check to be sure that the thermocouple is securely

connected to the oven control. If the thermocouple is connected to the oven control, and the control indicates “PROBE FAIL”, disconnect the thermocouple from the oven control and measure the resistance of the thermocouple. The thermocouple should read approx. 11Ω. If these readings are not achieved, replace the thermocouple. If these readings are correct, proceed.

Oven control If the thermocouple checks good, but the oven control

display indicates that there is a thermocouple failure,

Impinger X2 – Digital Service Manual – Dom & Int’l

replace the oven control. If the oven control indicates a temperature reading, but the oven will not heat, proceed.

Main gas valve Check to see that the switch on the valve is in the “ON”

position. Check for 24VAC supplied to main valve. If there is voltage present, check to see that valve is opening. Connect manometer to pressure tap on outlet side of valve. If there is voltage to the valve, but no output gas pressure, replace the valve.

Temperature regulation valve Check for 208/240VAC at temperature regulation valve.

If no voltage is present, trace wiring back to electronic temperature control. 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.

Oven control Check for 3 – 24VDC from the oven control at terminals

#J2-6 and J2-9. If there is no output voltage, replace oven control. If there is output voltage, Proceed.

Modulating valve Check for 3-24VDC at the modulating valve. If no

voltage is present, trace wiring back to the oven control. If voltage is present, listen for valve to open and close. Also check for opens or shorts in the operating coil. Replace modulating valve as needed.

Intermittent heating Thermal/Overload of main fan

and burner blower motors

The main fan motor and burner blower motor 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. Improper ventilation or lack of preventive maintenance may cause this. Also, most of the problems listed under “Oven will not heat” can cause intermittent failure.

Conveyor will not run NOTE: The ovens may contain two, three or four conveyor drive systems using like

components. The trouble shooting sequence will be the same for each of the conveyor

drive systems Power supply Check circuit breakers, reset if required. Check power

plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if needed.

Switch, oven power Check continuity between switch terminals. Replace

switch as needed.

Relay, main fan Check for 120VAC supplied to relay terminal #13. If

voltage is not present, trace wiring back to power supply. If voltage is present, check for 120VAC at terminal #14. If there is no voltage at terminal #14, and the relay is energized, replace the main fan relay.

Transformer, burner/control Check for 208/240VAC supplied to primary of

Switch, conveyor reversing Check for continuity between switch terminals. Replace

switch as needed.

Conveyor motor Check for 208/240VAC supplied to the motor. I no

voltage is present, trace wiring back to the reversing switch. If voltage is present, check motor windings for opens or shorts.

Impinger X2 – Digital Service Manual – Dom & Int’l

WITH POWER OFF: Check the motor windings as follows: Grey to Black – 114 ohm approx. Grey to Brown – 114 ohm approx. Brown to Black – 228 ohm approx. If any of the above fail, replace motor.

Capacitor, conveyor motor Check for shorts or grounds. Replace capacitor as

needed. WARNING: Capacitor has a stored charge, discharge before testing.

Conveyor Check for any mechanical problems in the conveyor

assembly. Check for damaged or torn belting. Check conveyor shaft bearings for damage or excessive wear. Repair or replace conveyor components as needed.

Oven control If there is voltage 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 display Oven control Check output voltage from oven control to hall effect

Motor, conveyor If there is voltage supplied to the hall effect sensor,

Oven control If the hall effect sensor readings are correct, but there

NOTE: Display will indicate “STALL”

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 the oven control. If there is

no voltage output present at the oven control, replace

the oven control.

check for a frequency output from the hall effect

sensor. Measure frequency across the yellow and white

wires at the motor connector. Frequency readings

should be between 15 Hz-500 Hz. If these readings are

not achieved, replace conveyor motor. If these readings

are achieved, proceed.

is no speed indicated on the display, replace the

control.

Impinger X2 – Digital Service Manual – Dom & Int’l

TROUBLESHOOTING GUIDE - INTERNATIONAL

3240-2* 230VAC 50 HZ. 1 PHASE 3262-2* 230VAC 50 HZ. 1 PHASE 3270-2* 230VAC 50 HZ. 1 PHASE

*NOTE:

Model number ending in TS indicates top belt is split belt

Model number ending in SB indicates bottom belt is split belt

Model number ending in SS indicates both belts are split belts

SYMPTOM POSSIBLE CAUSE EVALUATION Oven fan will not run Incoming power supply Check circuit breakers. Reset if required. Call power

co. if needed. Fuse, 3 Amp, control Check, replace if necessary. Fuse holder Check, replace if necessary. Switch, oven fan Check continuity between switch terminals. Replace

switch as needed. 30 minute time delay relay Check for supply voltage to 30 minute time delay relay

at terminals #1 and #3. If no voltage is present, trace

wiring back to fuse holder. If there is supply voltage at

terminals #1 and #3, check for output voltage at

terminals #2 and #3. If there is incoming voltage but no

output voltage, and the main power switch is on,

replace the 30 minute time delay relay. Relay, main fan Check for supply voltage to relay contacts, if no voltage

is present, trace wiring back to power supply. Check for

supply voltage to the coil of the main fan relay. If no

voltage is present, trace wiring back to the 30 minute

time delay relay, check to be sure that the Overload

Protector contacts are closed. If contacts are open, see

“Overload Protector” below. If voltage is present, check

to insure relay contacts are closing. Replace relay as

needed. Overload protector, main fan Check to be sure overload contacts are closed. If not

closed, re-set overload. If contacts do not close,

replace overload protector. If contacts close, test for

proper operation. If the overload contacts do not stay

closed, and the amperage is below the overload

setting, replace the overload protector.

3240 should be set at 13A

3262 should be set at 18A

3270 should be set at 18A Main fan motor Check for supply voltage at motor. If no voltage is

present, trace wiring back to the overload protector.

WITH POWER OFF: Check for opens, shorts or

grounds. Turn motor shaft to check for locked rotor. Capacitor Check for shorts or grounds.

WARNING: Capacitor has a stored charge, discharge

before testing. Drive belt Check for loose or broken drive belt. Adjust motor for

proper belt tension (maximum of 3/8-inch deflection), or

replace drive belt as needed. Bearings, Fan shaft Check for any damage or excessive wear on the shaft

bearings. Replace bearings as needed. Oven will not heat Gas supply Check for adequate gas supply to oven. Manual gas shut off valve Check to see that the manual gas shut off valve is

open. Also, check flexible gas line connection for any Impinger X2 – Digital Service Manual – Dom & Int’l

damage. Main fan motor Check for main fan operation. If it is not operating, refer

to “Oven fan will not run”. Relay, main fan Check for supply voltage to relay terminal #13. If

voltage is not present, trace wiring back to power

supply. If voltage is present, check for supply voltage at

terminal #14. If there is no voltage at terminal #14, and

the relay is energized, replace the main fan relay. Air pressure switch, Main fan

motor

Check for supply voltage to the air pressure switch. If

no voltage is present, trace wiring back to main fan

switch. This normally open switch should close when

the main fan is activated. Check air switch tube for

blockage or any obstructions, repair as needed. Refer

to the “Removal and installation” section for proper

adjustment of air pressure switch. Replace air pressure

switch as needed. Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset

thermostat and retest. If thermostat will not hold for

maximum oven temperature, and oven is not exceeding

temperature setting, check for proper location of

capillary bulb in its spring holder. If the capillary checks

okay, replace the hi-limit thermostat. Burner control Check for supply voltage to burner control at terminal

#1 and Neutral. If no voltage is present, trace wiring

back to hi-limit thermostat. If voltage is present, check

for supply voltage to burner blower motor at terminal #8

and neutral. If no voltage is present, wait thirty

seconds, reset burner control, and re-try. If the above

fails, replace burner control. Burner reset switch. Switch is normally open, check to see that the switch

closes when reset button is pushed. Replace switch as

needed. Motor, burner blower Check for supply voltage to the burner blower motor. If

no voltage is present, trace wiring back to the burner

control. If voltage is present, and the motor is not

turning, check for opens, shorts or grounds.

WITH POWER OFF: Check for locked rotor.

Replace burner blower motor as needed. Air pressure switch, burner

blower motor

Check for air pressure switch to be switching from “NC”

to “NO”. Check for air tube blockage or misalignment.

Replace air pressure switch as needed. Burner control A pre-purge time of 30 – 60 seconds occurs after

burner blower motor starts. Check for high voltage

spark output from the burner control. If there is no high

voltage spark output, check reset button for the burner

control. If there is still no high voltage output, replace

the burner control. Igniter/sensor assembly Check for visible damage to the igniter/sensor

assembly. If there is visible damage, replace

components as needed. If there is no visible damage to

the components, and there is no spark, replace the

igniter/sensor assembly. Also check for damaged wires

in the burner tube. Replace components as needed. Burner control Gas valve should open as the burner control generates

the high voltage spark. Check for supply voltage to pilot

valve at terminal #5 and neutral. If no voltage is

present, check reset button for the burner control. If

there is still no voltage the pilot valve, replace burner

control Gas valve Check for supply voltage at the pilot valve. If no voltage

is present, trace wiring back to the burner control. If 12

Impinger X2 – Digital Service Manual – Dom & Int’l

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