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AEC/Applicalion Engineering
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Unit will not heat.
Defective heater contactor.
Repair/replace defective
contactors.
Check resistance on all three
legs of heater with an ohm
Defective immersion heater.
meter. If not all equal, contact
factory for replacement
heater.
Check resistance on all three
Heater burnout.
legs of heater with an ohm
meter. Replace heater as
required.
Check the heater output with
Controller heater output
an ohmmeter. It should read
in the mega-ohm range.
open.
Infinite readings indicate a
defective output.
Unit overheats/unable to
Water supply to unit is turned
Open water supply.
cool.
OFF.
Drain is plugged or excessive
Clear drain line or eliminate
back pressure in drain line.
back pressure condition.
Heat exchanger tubes
Remove tube bundles.
plugged by lime deposits
Clean/replace as required.
Test solenoid valve by
•
Faulty solenoid valve.
switching to Manual Cool
and listen for valve operation.
Replace if faulty.
Cooling water temperature is
Lower the cooling water
too hot; cooling water flow is
temperature; increase
insufficient.
cooling water flow.
Heat exchanger is
Contact your AEC sales
undersized.
representative.
•
Page 58
TDH TrueTemp"' Series Hot Oil Temperature Control Units
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