INSTALLATION & OPERATION MANUAL
14 | P a g e w w w . n t e n g i n e e r s . i n
LED Diagnosis OF Ohmic IHS Unit.
Cut D8 D7-IHS D4
Description
On
If D8 turns on that means IHS board is getting 24V from
THC, if NOT check 24V supply to THC DB25 Pin 18,19,20
Off On
If D4 turns on when Work&Shield Shorted means 230V
T led should be OFF to test this
Off On On On
If D4 and IHS Turns on when Work&Shield shorted means
230V & 24V Present and board working Ok, Ohmic=1 shold
show in diagnosison THC
On On Off Off
If Cut LED is ON then Ohmic will not work even when
Work&Shield is shorted. This is for protection. Press down
momentarily or IHS to disable this LED and enable ohmic
again. L15/Ohmic LED inside the THC should glow when
Work&Shield is shorted
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