ATREA DUPLEX RA5 - Page 32

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STOP circuit active
The emergency stop contact
is opened.
The stop contact has been activated
by a fire or other safety system;
check its status.
Temperature sensor TU1
Communication breakdown
or failure of the TU1 fan
temperature sensor in the
unit.
Contact a service technician.
Temperature sensor TU2
Communication breakdown
or failure of the TU2 fan
temperature sensor in the
unit.
Contact a service technician.
Set orientation
(applies only to DUPLEX EC5 units)
The orientation of the unit is
not set; that is, it has not
been determined which is the
supply and exhaust fan.
This blocks the operation of the unit;
this parameter must be set in the
service menu. Contact a service
technician.
Cooler / heater setting
The cooler / heater type is
not set (water or electric.
This blocks the operation of the unit;
this parameter must be set in the
service menu. Contact a service
technician.
Pressure gauge fault
If the unit is fitted with air flow
rate gauges, one of them is
not working properly or has a
fault.
Contact a service technician.
Flow rate out of balance
The unit’s air flow rate is out
of balance, fans are not
working in keeping with the
settings.
Contact a service technician.
AHU overheating
One of the temperature
sensors detected
temperature exceeding 77°C.
Disconnect the unit from the power
supply and then reconnect provided
that there is no risk of ambient
space overheating (fire etc.).
Communication error
Breakdown of
communication between the
controller and AHU.
Check whether the cable between
the unit and controller is not
interrupted, or contact a service
technician.
Unit overheating
The emergency stop contact
has opened or the unit’s
temperature has exceeded
maximum permitted limit
77°C.
Switch off the power supply to the
AHU and wait 10 minutes.
Reconnect the power supply. If the
error message is still indicated on
the display, contact a service
technician.
Heat pump
Heat pump defrost status.
One of the possible operating
conditions of the heat pump, lasting
several minutes.