Lincoln Impinger Conveyor Ovens 1100 Series - Manual (Page 26)

No main fan cool down 20 Minute Time Delay Check for 120 VAC at pin#2 and #3
Relay while main fan is running. Turn off
main fan switch and 120 VAC should
continue to be present for 20 minutes.
Main Fan Relay Check if relay is operating and
terminals are remaining closed for
main fan cool down of 20 minutes.
Main fan runs after NOTE: The time delay relay will
20 minute cool down keep the coil of the main fan relay
closed, maintaining main fan operation for
cool down for approximately 20 minutes.
Cool Down Relay Contacts of the relay should
open when main fan is switched off.
Time Delay 120 VAC at terminal 2 should
discontinue approximately 20 minutes after main
fan is switched off. If cool down relay is open and
voltage continues at terminal 2,
replace time delay.
Main Fan Relay When voltage at terminal 2 of time
delay ceases, main fan relay must open.
No control box cooling Incoming Power Check main circuit breakers, reset if
required, call power company if
needed.
Main Fan Switch Check continuity between switch
terminals.
Control Box High Limit Terminals are normally closed, and
Thermostat open at 170°F ± 5°F (76.6°C ± 2.8°C).
Note: Discontinued at Check for over heating and reset
S/N 2011821 thermostat. Test for proper operation.
If it will not reset and hold, replace.
Fuse, 1 Amp Check, replace if necessary.
Fuseholder Check, replace if necessary.
Step Down Transformer 120 VAC should be present on
secondary. Replace as needed.
Cooling Fans 120 VAC should now be at these fan
motors. If voltage is present, check
motors for shorts or opens.
WITH POWER OFF: Check for locked rotor.
No automatic control Incoming Power Supply Check circuit breakers, reset if
box cooling required, call power company if needed
Cooling Fan Thermostat Thermostat is normally
open and closes at 120°F ± 3 (48.9°C ± 1.7°),
and opens at 100°F ± 3°F
(37.8°C ± 1.7°C).
Control Box Hi Limit Terminals are normally closed, but
Discontinued at S/N open at 170°C ± 5°F (76.6°C ± 2.8°C).
2011821 Check for over heating and reset
thermostat. Test for proper operation.
If it will not reset and hold, then
replace.
Fuse, 1 Amp Check, replace if necessary.
Fuseholder Check, replace if necessary.
Step Down Transformer 120 VAC ± 10% should be present at
secondary of transformer. If proper
voltage is not present, check
transformer primary for proper
input. Replace as needed.
Impinger II - 1100 Series Service Manual - International 26