Numatic HZ 190 Owner's Instructions Manual page 10

Low Flow Indicator
This appliance is fitted with a low flow indicator to show that air flow has reduced.
In the event of the indicator light flashing, check the following:-
Cause
Dust caps still fitted
Blocked hose
Bag full
Cloth filter clogged
Hepa cartridge clogged
Variant
Model
Classification
Voltage
Frequency
Power rating
Sound Pressure (LpA)
Uncertainty (KpA)
Low flow operation
(NB 16L/sec corresponds to an airspeed of 20m/sec in a 32mm pipe)
(NB 22L/sec corresponds to an airspeed of 20m/sec in a 38mm pipe)
Simplex
HZ
190, 200, 250, 350,
450, 570, 750, 900
TYPE H
115 / 120 / 220 -240V
50 - 60Hz
1000 W
65 dB (A)
0.5 dB
16L/sec (0.96m /min)
3
Solution
Remove the caps.
Unblock the hose.
Remove and replace
Remove and replace, clean dirty filter by
vacuuming.
Replace, seek advice from an instructed
person or manufacturer.
450, 570, 750, 900
115 / 120 / 220 -240V
22L/sec (1.32m
Duplex
HZD
TYPE H
50 - 60Hz
1000 W x 2
67 dB (A)
0.5 dB
/min)
3