62
English 05/09
ACCURATE AX - AW - AD - AT - AF
See the controller manual.
The parameter settings on the
microprocessor controller are not correct.
Check and calculate the latent load; check the
flow-rate and the conditions of the outside air;
check the inflow of outside air.
Latent load higher than expected
See “THE COMPRESSOR/COMPRESSORS
DON'T START”.
The compressor isn't working during the
dehumidification phase.
Check the operation of the solenoid valve that
controls the dehumidification circuit.
The dehumidification valve doesn't close.
See the controller manual; check the
operation of the panel and/or the probe.
The control system isn't working.
AMBIENT HUMIDITY
TOO HIGH
Check the room temperature setting (see the
control panel manual).
The parameter settings on the microprocessor
controller are not correct.
Verificare la consistenza del carico latente.
Latent load lower than expected.
Check the pressure of the supply water;
Check the operation of the manual control
system and the steam production unit (see the
control panel manual)
The humidifier isn't working.
See the control panel manual; check the
operation of the panel and/or the probe.
The control system isn't working.
AMBIENT HUMIDITY
TOO LOW
Check the power supply to the fans.
The fans are not powered.
Clean the filter using a vacuum cleaner after
having shaken off the larger particles of dust.
Replace the filter if excessively clogged.
Check the correct calibration of the dirty filter
differential pressure switch F4.
The filters are blocked (possible activation of
the dirty filter alarm).
See the paragraph on AIR DISTRIBUTION
Obstructions to the air flow.
Check the resistance of the fan windings; after
resetting, measure the voltage and power
input.
The fan thermal cutout has tripped.
EC radial fan speed set too low
Check the sizing of the air distribution system
(ducting, false-ceiling, underfloor plenum, grills)
Excessive pressure drop in the air distribution
system.
LOW OR NO AIR
FLOW
FAULT
CAUSE
SOLUTION
