E9 to E28 NKR Service Manual.pdf - Industrial Air

13.13.2.2 Infrared Sensor Abnormality
Abnormality detection:
o Connector disconnection / Wire cut abnormality
Sensor judge Hi level continuously for 25 seconds
o Circuit abnormality
70 seconds after power ON, if infrared sensor judge Lo level continuously for 25 seconds
Error Code judgment
o When abnormality happened, internal counter increase by 1 time.
o Infrared sensor power OFF, retry after 5 seconds.
o When the infrared sensor maintains normal condition for 120 seconds, the counter reset or AC reset.
o When abnormality counter reached 4 times, H59 occurred – No TIMER indicator blinking.
When error code happened, the unit is able to operate without AUTO COMF / ECO NAVI.
13.13.2.3 Infrared Sensor Check Mode
To enable Infrared sensor abnormality check mode:
During ECO NAVI is ON, when CHECK signal received, if either sensors has abnormality, the 4 times
abnormality counter is ignored, ECO NAVI Indicator will blink immediately and error code is memorized.
The unit could operate without ECO NAVI or AUTO COMF.
The ECO NAVI indicator blinking could be cancelled by pressing ECO NAVI button again.
If the Infrared sensor has no abnormality, the CHECK process will end and continue with normal operation.
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