30
HUMIDITY CONTROL
FANS
ELECTRIC HEATER
PROBLEM
POSSIBLE CAUSE
CHECK/CORRECTIVE ACTION
rooM HUMiDitY too
HiGH
A) the parameter settings on the control panel
are not correct.
See control panel instruction manual.
B) the latent load is higher then expected.
Check the latent load, fresh air conditions and
volume; external air infiltration.
C) the compressor does not function during
dehumidification.
See “tHe CoMPreSSor DoeSn’t WorK”.
rooM HUMiDitY too
LoW
A) the parameter settings on the control panel
are not correct.
Check the room humidity settings (see control
panel instruction manual).
B) the latent load is lower than expected.
Check the quantity of latent heat.
C) The humidifier doesn’t work.
1) Check the water supply pressure.
2) Check the function of the manual control
system and of the steam production group (see
panel instruction manual).
D) the control system does not work.
See the control panel instruction manual; check
that the control panel and/or sensors work
properly.
PROBLEM
POSSIBLE CAUSE
CHECK/CORRECTIVE ACTION
ABSent or LoW Air
FLoW
A) there is no power to the fans.
Check the power supply to the fans
B) The air filters are clogged (dirty filter alarm
enabled).
1) Shake the dust out of the cartridge and clean
with a vacuum cleaner. Replace the filter if it is
completely blocked.
2) Check the correct setting of the dirty filter
pressure switch PFS.
C) The air flow is obstructed.
Check that the air flow is not obstructed, not
even partially.
D) the fans’ thermal protection intervenes.
Check the resistance of the fan motor
windings. re-set then measure the voltage and
absorption.
E) The power supply to the fans is insufficient.
Change the power supply voltage to the fans.
(See paragraph. ‘Setting and adjustment).
F) the air distribution output pressure is too
high.
Check the air pressure distribution (ducts,
ceiling or floor plenum, grilles).
PROBLEM
POSSIBLE CAUSE
CHECK/CORRECTIVE ACTION
interVention oF
one or BotH oF tHe
eLeCtriCAL HeAterS’
SAFetY tHerMoStAtS
A) There is insufficient air flow.
See “LACK oF / ABSent Air FLoW”.
B) the thermostat connection wire is interrupted Check the continuity of the connection of the
safety thermostats and the control system
C) one or both of the thermostats are broken
replace one or both of the electrical heaters’
safety thermostats
