AQS51/61-KAM COMBINED CO
2
-/TEMPERATURE DUCT SENSOR/CONTROLLER
Home and Building Control
Honeywell AG
Böblinger Straße 17
D-71101 Schönaich
Germany
http://europe.hbc.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-1023 GE02R0700
DIN
EN ISO 9001
Manufacturing location is certified according to
SELF DIAGNOSTICS
The system contains complete self diagnostics, which is
executed automatically every time the power is turned on.
This function checks returns an error byte to system RAM. If
the error message equals 8, it will not be cleared until a new
self diagnostic procedure is activated after a power up. The
other codes are reset when the causes have vanished.
For AQS51/61-KAM the tests comprise checking internal
voltage regulators and output values. In addition, constantly
during operation, the sensor probes are checked against
failure by checking the valid dynamic measurement ranges.
Error Code and Actions
Error Code
Suggested Action
4
Indicate problems with the power
supply.
Check power supply voltage.
8
Indicates problem with OUT1.
Could be too high an output load
connected to the output. Check OUT1
with a voltmeter and compare the
output with the LCD reading (for
AQS61-KAM).
Disconnect the output wiring
to
check if the external load is too high
and causes the error indication. To start
the internal output diagnostic, switch
the power off and restart the unit.
32
Sensor out of range.
Occurs during over exposure of CO
2
sensor, in which case the error code
will automatically reset when the
measurement values return to normal.
Could also indicate the need of zero
point calibration. If the CO
2
reading is
correct and the error code remains, the
temperature sensor must be broken.
NOTE:
If several errors are detected at the same time,
the different error code numbers will be added
together into one single error code.
