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•
Check the dehumidifier on delivery for any transport damage.
•
The dehumidifier should be protected from rain and snow.
•
The dehumidifier should always stand upright on its feet.
•
Transport and lift the dehumidifier by the two handles on each
side of the transportation box.
9. NOISE DATA (DHA 250)
Noise path (Fig. 5.):
A. Open intake for process air.
B. Open intake for processair. Dry air outlet ducted and air
discharged at 2-3 m above floor.
C. Ducted outlet for dry air. Wet air outlet ducted with short 90
degree angle duct.
D. Only dry air and wet air outlet ducted.
E. All outlets completelyducted.
MALFUNCTION
None, or reduced dehumidification
capacity
Main fuse faulty
Dehumidifier does not start
Rotor does not rotate
No dry- or wet air volume
Symbols
L
L
K = Correction for calculation of LWAO (L
dB(A) = Noise power level at room condition R = 10
10. FAULT FINDING
POSSIBLE CAUSE OF TROUBLE
Filter clogged
Electrical heater faulty
Airflow reduced
No rotation of rotor
Internal leakage in unit
Altered air volumes
Altered reactivation temperature
Air leakage
Fan faulty
Too large air volume
Rotor does not rotate
Reactivation heater faulty
No control circuit
Faulty control signal
Fuse for controls faulty
Drive belt is slipping
Drive belt broken or worn
Rotor jammed
Drive motor faulty
Filter clogged
Fan faulty
Ducts blocked
Correction of K dB at ISO-band No/Centre frequency (Hz)
A
65
-26
-14
-10
B
66
-22
-11
C
67
-27
-12
D
67
-27
-13
E
59
-24
-10
-11
= Total noise level in dB(A) (rel. 10
WA
= Noise power level in octave band dB(A) (rel. 10
WAO
Clean or replace filters
Check fuses
Check openings and dampers
Check belt tensioning
Check springs
Measure and check air volumes
Check reactivation heater
Check panel and casing
Check fan and motors
Check air volumes and dampers
Check drive motor and drive belt
Check reactivation heater
Check control fuses
Check external start/stop signal
Check electrical components
Check belt tensioning
Replace drive belt
Check centre shaft, rim of rotor
Replace complete gear motor
Clean or replace filters
Check fan, motor and impeller
Check dampers and ducts
-10
-9
-3
-9
-6
-10
-10
-3
-9
-7
-7
-10
-3
-8
-7
-10
-10
-3
-8
-6
-4
-5
-14
-12
W)
-12
= L
+ K)
WAO
WA
2
Sab
CORRECTIVE ACTION
-15
-15
-14
-14
-20
W)
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