Ambient Air Temperature; Location And Clearance; System Arrangement; Piping And Connections - Sigma HRD Serie Manual De Instrucciones

Ambient Air Temperature

Locate the dryer under cover in an area where the am-
bient air temperature is between 35°F and 120°F.

Location and Clearance

Install the dryer on a level pad. The dryer is provided
with a minimum -inch diameter anchor bolt holes.
5
8
For dryers 56 through 600 scfm, anchor the dryer to
the floor with four ½-inch diameter bolts with a mini-
mum 4-inch thread engagement. For dryers 800 scfm
and larger, anchor the dryer to the floor with four ¾-
inch diameter bolts with a minimum 6-inch thread en-
gagement. Allow 24 inches clearance on all sides of
the dryer for servicing. Provide adequate clearance for
prefilter and afterfilter element replacement. Provide
protection for the dryer if it is installed where heavy
vehicles or similar portable equipment is likely to
cause damage.

System Arrangement

Install the dryer downstream of an aftercooler and sep-
arator so that the dryer inlet air is between 60°F and
120°F and contains no liquid water. Liquid water
and/or inlet air temperatures above 100°F can reduce
drying capacity. Contact your local distributor for in-
formation on proper dryer sizing at elevated inlet air
temperatures.
Oil contaminates the desiccant, reducing drying effi-
ciency and desiccant life. An oil-removing filter is in-
stalled at the dryer inlet to protect the desiccant from
oil contaminants. A particulate filter is installed after
the dryer to remove dirt and other solid particles.

Piping and Connections

All external piping must be supplied by the user unless
otherwise specified. Refer to Table 1 for connection
sizes. Inlet and outlet manual shutoff valves and a vent
valve are recommended so the dryer and filters can be
isolated and depressurized for servicing. Refer to Fig-
ure 1 for recommended piping layout. The connections
and pipe fittings must be rated for or exceed the maxi-
mum operating pressure given on the dryer data plate
and must be in accordance with industry-wide codes.
Table 1
CONNECTIONS
Model
HRD56 / HRD56EM
HRD100 / HRD100EM
HRD160 / HRD160EM
HRD200 / HRD200EM
1-4
Connections
(inches)
Inlet Outlet
¾ NPT ½ NPT
1 NPT ¾ NPT
1¼ NPT 1 NPT
1½ NPT 1¼ NPT
Model
HRD275 / HRD275EM
HRD350 / HRD350EM
HRD475 / HRD475EM
HRD600 / HRD600EM
HRD800 / HRD800EM
HRD1000 / HRD1000EM
HRD1200 / HRD1200EM
HRD1450 / HRD1450EM
HRD1710 / HRD1710EM
HRD2010 / HRD2010EM
HRD2250 / HRD2250EM
HRD2600 / HRD2600EM
HRD3250 / HRD3250EM
Be sure all piping is supported. Do not allow the
weight of any piping to bear on the dryer or filters.
Piping must be the same size as or larger than the
dryer connections. Piping smaller than the dryer con-
nections will cause high pressure drop and reduce dry-
ing capacity.
If the purge exhaust muffler piping must be extended
outside the dryer area, the piping must be sized so that
it will cause no more than 0.25 psig back pressure.
Back pressure reduces the capacity of the dryer.
Figure 1
RECOMMENDED PIPING LAYOUT
HRD and HRD-EM Series (Bulletin 378)
Connections
(inches)
Inlet Outlet
2 NPT 1¼ NPT
2 NPT 1¼ NPT
2 NPT 1½ NPT
2½ NPT 2 NPT
3 NPT 2½ NPT
3 NPT 2½ NPT
3 NPT 3 NPT
3 NPT 3 NPT
4 NPT 3 NPT
4 FLG 4 FLG
4 FLG 4 FLG
4 FLG 4 FLG
6 FLG 4 FLG