Dantherm DanX 1 - FAULTFINDING; 7.1 Introduction; 7.2 Fault Finding

7. FAULTFINDING
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7.1 Introduction
Normally an operation fault will give an alarm in the display of the control panel. For
details, please refer to section 4 Controls in this manual.
7.2 Fault finding
1)
If the frost thermostat is manual, you have to reset the thermostat before starting the
unit. The thermostat is normally located on the upper deck of the unit near the heating coil.
2)
The fire thermostat must be reset before the unit is started again. Press the red button
on the thermostat to reset. The thermostats are located in the exhaust (70°C thermostat)
and supply (40°C) air.
3)
The HP pressostat has to be reset before the
compressor can start again. The red reset
button (1) is placed inside the unit, just above
the compressor.
Alarm
Problem
Cause
Action
Service
Filter is dirty
• Filter blocked
• Change filter
Fan
Fan stopped
• Thermal overload
• Wait until motor has cooled
down. Start the unit. If fan
stops quickly again
change/repair motor
Frost
1)
Valve not opening
• Defect actuator
• Valve stuck
• Change/Repair actuator
• Change/Repair valve
No hot water
• Pump not working
• Boiler problem
• Change/Repair pump
• See boiler manual
Fire
2)
Return air
temperature > 40°C
• Fire in the building
• Check reason for high
temperature in return air
duct
Supply air
temperature > 70°C
• After heating coil not
working correct at low
air volume
• Fire in the unit
• Check heating coil controls
HP/ LP
3)
Compressor
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
LP pressure under
1.5 bar
• Leakage in the cooling
circuit
• Evaporator iced up
• Repair cooling circuit
• De-ice evaporator/check
de-icing function