Delta HEX150PC Instruction Manual page 6

User can follow dry contact definition that is Normal Close (N.C.) to
detect abnormal status from pin 10 & pin 11
Definition
Connection
Control board, NTC and fan are in
normal status
NTC resistance is over range such as
"open circuit" or "short circuit"
Fan speed is lower than 50% of
definition or fan is locked
Dry contact max. rating : 75VDC/50mA
LED indicator
INNER FAN / OUTER FAN / STATUS LEDs indicate fan and NTC
sensor status .
Depress "TEST" button to start auto-test of outer and inner fans
running from low to high speed. Turn off by depressing the "TEST" button
again .
Normal
Failed*
Normal
(touch TEST / CLEAN)
Failed*
(touch TEST / CLEAN)
* FAN failed : Fan speed is lower than 50% of definition or fan is locked
* STATUS Failed : NTC resistance is over range such as "open circuit" or
HEX150PC Heat Exchanger Instruction Manual
INNER FAN
GREEN
RED
Blinking
GREEN
Blinking
RED
"short circuit"
Page 4
N. C
Pin 10 & Pin 11
CLOSE
OPEN
OPEN
OUTER FAN STATUS
GREEN
RED
Blinking
GREEN
Blanking
RED
GREEN
RED
N/A
N/A