6. FAULTFINDING
34
6.1 Introduction
Normally an operation fault will give an alarm in the display of the control panel. The alarm
messages may be named differently. For details, please refer to the manual of the control
panel.
If the frequency converter for the fan is showing an alarm, please refer to the manual of
the frequency converter.
6.2 Faultfinding
Alarm Problem
Cause
Action
Valve not opening
•
Defect actuator
•
Valve stuck
•
Change/Repair actuator
•
Change/Repair valve
Frost
1)
No hot water
•
Pump not working
•
Boiler problem
•
Change/Repair pump
•
See boiler manual
Return air
temperature > 40°C
•
Fire in the building
Fire
2)
Supply air
temperature > 70°C
•
After heating coil not
working correct at low
air volume
•
Fire in the unit
•
Check heating coil controls
Filter
Filter is dirty
•
Filter blocked
•
Change filter
Flow error
•
Fan belt broken
•
Fan motor broken
•
Damper not open
•
Change belt
•
Change/repair motor
•
Check damper/motor
Thermo relay
switched off
•
Fan motor broken
•
Phase missing
•
Fan belt broken
•
Thermo relay broken
•
Change/repair motor
•
Connect all phases correct
•
Change belt
•
Change thermo relay
Flow
Frequency
converter switched
off
3)
•
Fan motor overload
•
Fan motor broken
•
Phase missing
•
Check air volume/pressure
•
Change/repair motor
•
Connect all phases correct
HP pressure over
24 bar
•
Air volume too small
•
Blockage in cooling
circuit
•
Outside temperature too
high
•
Check air volume
•
Check/repair cooling
circuit
•
Reset pressure switch
HP/ LP
4)
LP pressure under
1.5 bar
•
Leakage in the cooling
circuit
•
Evaporator iced up
•
Repair cooling circuit
•
De-ice evaporator/check
de-icing function
Compressor
Thermo relay
switched off
•
Compressor broken
•
Phase missing
•
Thermo relay broken
•
Change compressor
•
Connect all phases correct
•
Change thermo relay
Summary of Contents for DanX 2/4 XKS
Page 2: ......
