Lincoln 1100 Series Switch, Heat, to neutral. Replace if defective, Air Pressure Switch

Switch, Heat	With switch on, check for 120 VAC on both terminals
	to neutral. Replace if defective.
Air Pressure Switch	This normally open switch should close when the
	main fan is activated. Adjust if necessary (Refer to
	Section D). Replace if defective.
Fuse, 3 Amp	Check, replace if necessary.
Fuseholder	Check, replace if necessary.
Temperature Control	Check for 120 VAC supply at terminal #11 to neutral
	on temperature control. If no voltage is present, trace
	wiring back to 3 amp fuse. Turn the temperature
	adjustment knob to maximum temperature position
	and check for 120 VAC at the load terminal (#9) and
	neutral. If 120 VAC is present and unit is not heat
	-ing, refer to “Mercury Contactor” for next check.
	If 120 VAC is not present, proceed.
Thermocouple Probe	WITH POWER ON AND THERMOCOUPLE
	LEADS ATTACHED TO THE TEMPERATURE
	CONTROL BOARD: measure D. C. millivolt output of
	these leads. Refer to thermocouple chart in Section
	D for proper readings. If these readings are not
	achieved, replace thermocouple.
Temperature Control	WITH POWER OFF: remove the
Potentiometer	potentiometer leads from the
	temperature control board and measure ohms from
	black to white leads. The reading should be from
	approximately 0 to 2.5k ohms as the dial of the
	potentiometer is turned throughout its full rotation.
	From black to red leads, the reading should be
	approximately 2.5k ohms (constant) throughout the
	full rotation of the dial. If these readings are not
	achieved, replace potentiometer. If the thermocouple
	probe and the control potentiometer check good,
	then the problem is usually with the temperature
	control board.
Mercury Contactor	Check for 120 VAC to the contactor coil. If voltage is
	present and contact will not activate, replace the
	contactor.Also, check each contactor for proper
	high voltage input and output.
Heater Elements	Check the Amp. draw on each hot leg for
	proper load.
	Check the specifications plate for rating
	information.
	If the Amp. draw is low or high, check
	the individual elements for opens,
	shorts, and proper resistance.
	WITH POWER OFF: To check resistance
	of the elements, remove all leads from
	the elements and use an accurate digital
	VOM. The element resistance should be

Impinger II - 1100 Series Service Manual - International 35