Lincoln IMPINGER CONVEYOR OVENS 1600 Manuale Utente

Low Profile – 1600-000-A Advantage Series Service Manual – Domestic

Cooling Fan(s)

120 VAC should be at the motor. If voltage is present, check

motor for shorts, opens, or grounds. WITH POWER OFF:

check for locked rotor.

Gas Supply

Check for adequate gas supply and closed manual gas valves.

Also, check flexible gas line connection.

Main Fan

If not operating, refer to "Oven fan will not run".

Oven will not heat

NOTE: These ovens utilize 2 complete burner/temperature control systems. Each system will follow the same

troubleshooting sequence.

Centrifugal Switch of

Main Fan Motor

Check for 120 VAC supplied to the centrifugal switch, if

voltage is not present, trace the wiring back to the oven power

relay. Check for 120 VAC out of the centrifugal switch. If

voltage is supplied to the centrifugal switch, and motor is

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

replace the fan motor.

(NOTE: See Schematic Diagram of proper wire numbers on

motors.)

Fuse, Burner 10A

Check, replace if necessary.

Fuse holder

Check, replace if necessary

Burner Blower Motor

Check for 120 VAC supply to the burner blower motor, if 120

VAC is present and motor does not turn, replace the motor.

Burner Transformer

Check for 120 VAC to primary of the 24 VAC burner

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

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

if no secondary voltage is present, replace the transformer.

Centrifugal Switch of

Burner Blower Motor

Check for 24 VAC supply to the centrifugal switch of burner

blower motor (see Schematic for proper wire numbers). If no

voltage is present, trace wiring back to the 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

marked 24V and 24Vgnd. If voltage is not present, trace

wiring back to the centrifugal switch. Check for 120VAC

supply to the ignition control at terminals L1 and L2. If no

voltage is present, trace wiring back to fuse. If the above

checks are okay, proceed. The ignition control should switch

120VAC to the hot surface igniter, across the (2) terminals

marked HIS. 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 glass in 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.

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, and 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 valves, check piping for obstructions. If there