Lincoln Impringer Conveyor Oven 1200 - Manual (Page 31)

Impinger I -–1000 Series Service Manual - International 31
Model 1030 - 1031
SYMPTION POSSIBLE CAUSE EVUALATION
Gas Supply Manual Gas
Shut-Off Valve Check for adequate gas supply to oven. Check to
see that manual shut-off valve is open.
Fan Switch Check to see that the fan switch is on
Main Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run."
Burner Switch Check for 220 VAC to neutral on both sides of
switch. If switch is closed, and 220 VAC is present
on one side only, replace switch .
Gas Pressure Switch (internal
to gas valve) Check for 220 VAC 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 8.8 Nat., 23 L.P.
2.0 Town Gas. Check gas filter in gas valve for
blockage or damage. (See Adjustment Section for
location) If the above checks okay, but switch still
not closed, replace gas valve.
Air Pressure Switch Check for 220 VAC on both side of switch. If
voltage present on one side only, check for air tube
blockage or misalignment adjust air switch. If above
fails, replace air pressure switch.
Hi-Limit Thermostat 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 temperature dial setting, check for
proper location of capillary bulb in its spring holder.
If above checks okay, replace hi-limit thermostat.
Ignition Control Check for 220 VAC supply to ignition control at pin
#1 and neutral. If voltage is not present, retrace
wiring back to hi-limit thermostat. Check for 220
VAC at pin #6 to neutral. (Power to burner motor
relay). If voltage present, proceed. If no voltage is
present, wait 30 seconds and check reset button. If
above fails, replace ignition control.
Burner Motor Relay Check for continuity to 220 VAC coil. Check for
power to relay coil (220 VAC). Check for 120 VAC
to relay contact terminals. Visually check for
contact pull-in.
Burner Blower Motor Check for 120 VAC supply to burner blower motor.
WITH POWER OFF: turn blower wheel to check for
locked rotor. If 120 VAC is present and motor does
not run, replace motor.
Burner Blower Motor Air
Pressure Switch Check for 220 VAC switching to pin "N.O." as the
air pressure switch closes. Connect a temporary
jumper wire (for testing purposes only) from pin "C"
to pin "N.O." on ignition control (to bypass air
switch). NOTE: For Honeywell control only. Check
for air tube blockage or misalignment, adjust air
pressure switch. If the above fails, replace air
pressure switch.
Oven will not heat
Spark Generator After a pre-purge time of 30 to 60 seconds after
blower motor starts, check for 220 VAC to spark
generator. If voltage is not present, check reset
button on ignition control. If voltage is still not
present, replace ignition control. f voltage is
present, visually check for spark at ignitor head.