71
018717 • Version
1.1 • 23.01.2007
Fault finding guide
Introduction
This section will give you an instruction in locating the fault, when the fail LED on the
control panel is active.
DanLink
Besides fault finding from the LED signals Dantherm Air Handling can provide DanLink
as accessory. DanLink can provide you with specific information of where the fault is
located.
For further information about DanLink, please see section “Accessories”, page 35.
Fail LEDs
The control board is equipped with three failure or alarm relays.
These three relay’s give alarms depending on the degree of alarm. The alarms are
categorized as follows:
Category
Fail LED
When to be cleared…
Warning
Permanently lit
To be cleared when convenient
Fail
Slowly flashing (½ Hz ~once
every 2 seconds)
To be cleared soon but not
immediately
Alarm
Fast flashing (2 Hz ~ 2 per
second)
To be cleared as soon as possible
Fault
during test
Flashing (1 Hz ~1 each
second) for 30 seconds after
the test has ended
After the 30 seconds the LED will act
according to the severity of the fault
(one of the 3 above), and you should
act accordingly
The following gives you a description of each type of alarm.
Warning
A warning is activated on one of the following events:
•
The condenser temperature sensor is missing or short circuited
•
The hot spot temperature sensor is short circuited
•
The return air temperature is 20 °C above the compressor set point. The alarm will
be cleared when the temperature again is less than 18 °C above the set point
•
The return air temperature is 5 °C below the heater set point. 2 °C above this
temperature the alarm will be cleared.
•
The condenser temperature has been above 75 °C. This warning will be cleared at
condenser temperature again is below 60 °C and have been for at least two
minutes
•
The filter input is activated
•
The unit is working in occupied mode
•
Fail on the supply air sensor – open or short circuited
Continued overleaf
