Moisture Over-Ride; Technical Specification - Parker CDAS HL 050 Guide D'utilisation

2.3 Moisture Over-ride

In certain geographical locations, a dryer can be operated for extended periods with low amounts of water vapour in the inlet air (for example,
some countries can have an ambient temperature up to +40 °C in summer and as low as -40 °C in winter). As the dryer must be sized for summer
conditions, during winter, months, the EST - Energy Saving Technology will save the user air, energy & money.
However, due to the way a desiccant bed adsorbs water vapour, during winter months with low levels of water vapour in the incoming air, the
saturation profile of the desiccant bed changes and a condition may occur where the bed becomes too saturated to be regenerated by the
standard purge regeneration cycle.
Therefore, the CDAS / OFAS EST - Energy Saving Technology also incorporates a safety feature to protect the desiccant material. The safety
feature, called Moisture Override activates after 30 minutes, interrupting the energy management function and changing the drying columns over.
This allows a full 2 ½ minute regeneration cycle of the desiccant material to take place before going back into energy saving mode. This allows
energy savings to be realised without causing damage to the desiccant bed.
CDAS / OFAS dryers are typically fitted with a dewpoint monitor as standard (not on pneumatic models). This can be in the form of a digital PDS
(Parker Dewpoint Sensor) or analogue hygrometer (-70 °C PDP / -100°F PDP dryers). This moisture override functionality is only applicable if
either a are fitted. If neither is fitted, this feature has no effect upon the timing cycles.

2.4 Technical Specification

Dryer Performance
Dryer Model
CDAS HL
OFAS HL
Important Note Regarding -70°C (-100°F) Dewpoint.
A compressed air dryer supplying a pressure dewpoint of -70°C (-100°F) requires a different desiccant fill to dryers supplying a standard -40°C / -
20°C pressure dewpoint. During shipping, desiccant material adsorbs atmospheric moisture. Following installation, commissioning and initial
operation, the dryer will start to "dry down" until it provides the desired -70°C (-100°F). Once achieved, the dryer will continue to supply air at the
required dewpoint, however it is important to note that the dry down period may take several days / weeks to achieve the -70°C (-100°F)
dewpoint.
Technical Data
Dryer Model
CDAS/OFAS HL
Flow Rates
Pipe Size BSPP
Dryer Model
CDAS/OFAS HL 050
CDAS/OFAS HL 055
CDAS/OFAS HL 060
CDAS/OFAS HL 065
CDAS/OFAS HL 070
CDAS/OFAS HL 075
CDAS/OFAS HL 080
CDAS/OFAS HL 085
Stated flows are for operation at 7 bar g (100 psi g / 0.7 MPa g) with reference to 20ºC, 1 bar a, 0% relative water vapour pressure.
Pressure
ISO 8573-1:2010
Dewpoint
Water Classification
(Standard)
o o
(Standard)
C F
-40 -40 Class 2.2.2
-40 -40 Class 2.2.0
Min Operating Max Operating
Pressure
bar g psi g bar g
4 58 16
or NPT
1/2"
1/2"
1/2"
1/2"
3/4"
1"
1"
1 1/2"
Pressure
ISO 8573-1:2010
Dewpoint
Water Classification
(Optional)
o o
C F
-70 -100
-70 -100
Min Operating
Pressure Temperature
o
psi g
C
232 5
Inlet Flow Rates
3
L/s
m /min
15 0.92
19 1.17
25 1.50
31 1.84
42 2.51
51 3.09
61 3.67
83 5.01
Pressure
Dewpoint
(Optional)
o o
(Optional)
C
-20 -4
Class 2.1.2
Class 2.1.0 -20 -4
Max Operating
Temperature
o o o
F C F
41 50 122
3
m /hr
55
70
90
110
150
185
220
300
ISO 8573-1:2010
Water Classification
(Optional)
F
Class 2.3.2
Class 2.3.0
Max Ambient
Temperature
o o
C F
55 131
cfm
32
41
53
65
88
109
129
177
5