D-3
Z MED Medical Air System
4107 9022 67.00
Appendix D - Desiccant Dryer
flows downwards through the other tower,
regenerating (drying) the desiccant. A nozzle
for operation of the dryer at 7 bar is installed as
standard. The regeneration air is released via the
corresponding solenoid valve and the silencer.
The solenoid valves are controlled by the timer.
After a preset period, (or when triggered by
the PDP sensor), the function of the towers is
reversed. The fully regenerated tower will now
dry the air, while the desiccant in the other tower
will be regenerated.
By default, the regeneration timer will restart
from the beginning of the cycle in case of a
power failure during operation or in case the
dryer was switched off.
The working sequence of the controller is the
following:
When the ON/OFF push-button is pressed during
operation, the controller jumps automatically to
status 5 or 12 (equalization phase). After that,
the Stop status (0) will be reached. The following
start command will restart the sequence from
the state 2 or 9. The same happens when the
power is switched off.
On dryers equipped with the DC1 controller
when dryer is in purge saving mode, the
controller jumps automatically to status 5 or
12 (equalization phase). When the purge saving
mode is deactivated, the cycle will restart from
status 2 or 9.
Status
Left Vessel
Right Vessel
V1
V2
V3
V4
0
Stopped
Stopped
0
0
0
0
1
Adsorbing
Adsorbing
0
0
0
0
2
Shifting
Adsorbing
1
0
0
0
3
Depressurizing
Adsorbing
1
0
1
0
4
Regenerating
Adsorbing
1
0
1
1
5
Equalizing
Adsorbing
1
0
0
0
6
Freeze (compressor
synchronization)
Adsorbing
1
0
0
0
7
Standby
Adsorbing
1
0
0
0
8
Adsorbing
Adsorbing
0
0
0
0
9
Adsorbing
Shifting
0
1
0
0
10
Adsorbing
Depressurizing
0
1
1
0
11
Adsorbing
Regenerating
0
1
1
1
12
Adsorbing
Equalizing
0
1
0
0
13
Adsorbing
Freeze (compressor
synchronization)
0
1
0
0
14
Adsorbing
Standby
0
1
0
0
