5
3.2 Electrical Specifications
MODEL
WATTS
7
13
20
25
30
35
50
27.5
27.5
27.5
31.8
31.8
33.0
17.0
FG
S2
A2
FG
S1
A2
FG
AC
1
AC
2
SOL.1
SOL.2
SOL.1 OUT
SOL.2 OUT
MAIN POWER
PCB
SW1
GROUND
G
1
2
3
4
G
L1
L2
ELECTRICAL
CONNECTION
L1
L2
E
LEGEND
All Models
SOL 1
Left Purge Valve
SOL 2
Right Purge Valve
All Models
SW1
On/Off Switch
Figure 4 Electrical Hook-up
3.3 Dryer Location in a Compressed Air System
NOTE:
Air Compressor should be adequately sized to handle
air system demands as well as purge loss. Failure to take
this into account could result in overloading air compressors
and/or insufficient air supply downstream.
NOTE:
It is desirable to install dryer where compressed
air is at the lowest possible temperature (downstream of
aftercoolers) and the highest possible pressure (upstream of
pressure reducing valves) without exceeding the maximum
working pressure.
A.
Aftercooler/separator
- Compressed air entering dryer
must be cooled to at least 120°F (49°C). Use aftercooler
and separator if higher temperatures are present.
A
1
2
1
2
C
DESICCANT
DRYER
COMPRESSOR
AFTERCOOLER
SEPARATOR
A
B
D
PREFILTERS
AFTERFILTERS
NOTE:
Installation of a refrigerated dryer ahead of a pres-
sure-swing desiccant dryer does not increase desiccant
dryer capacity or reduce purge flow requirements. How-
ever, if necessary, a cooling unit can be installed ahead of
the desiccant dryer to reduce the inlet air temperature to
the dryer, producing a correspondingly lower outlet dew
point.
B.
Prefilters
- Adequate filtration is required upstream of
the dryer in order to protect the desiccant bed from
contamination. The following filters are recommended:
1.
Air Line Filter
- On compressed air systems utiliz-
ing non-lubricated (oil-free) air compressors, use to
protect desiccant bed from solid and liquid contami-
nation. On systems with lubricated compressors, if
bulk liquid is present, use as a prefilter ahead of the oil
aerosol removal filter.
2.
Oil Aerosol Removal Filter
- On systems with lubri-
cated compressors, use to remove oil aerosols and
protect desiccant bed from oil contamination.
C.
Desiccant dryer
