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Compressor
2.
Remove all mounting bolts from blower base which
MAY have been used for shipping purposes. The
blower is designed to vibrate freely on its vibration
pad during operation.
NOTE: The blower manufacturer cautions that the
blower should not be bolted down during operation.
3.
Reconnect the blower motor power connections to
the dryer unit according to the electrical drawings
in the back of this manual. Be sure to follow all
applicable electrical codes.
CAUTION: The blower and motor have been completely
checked and operated prior to shipment from the fac-
tory. After connecting the power supply to the motor,
momentarily energize the blower motor starter. Blower
rotation should match the indicator arrow on the blower
housing. If not, disconnect power and reverse the wiring
connections.
4.4 Piping and Connections
All external piping must be supplied by the user unless
otherwise specified. Refer to Figure 2 for connection
sizes. Inlet and outlet isolation valves and a vent valve
are recommended so the dryer can be isolated and
depressurized for servicing. The connections and pipe
fittings must be rated for or exceed the maximum oper-
ating pressure given on the dryer nameplate and must
be in accordance with industry-wide codes. Be sure all
piping is supported. Do not allow the weight of any pip-
ing to bear on the dryer or filters. Piping should be the
same size as or larger than the dryer connection. Piping
smaller than the dryer connections will cause high pres-
sure drop and reduce drying capacity.
If the purge exhaust piping must be extended outside the
dryer area, choose a combination of diameters, lengths,
and turns that limits the additional pressure drop to 1/4
psid or less. BACK PRESSURE WILL CAUSE DRYER
MALFUNCTION. Consult the factory for piping details
if required.
WARNING — Do not operate dryer without installed
mufflers. Exhausting compressed air directly to
atmosphere will result in noise levels above OSHA
permissible levels and rapidly expanding gas could
potentially cause harm to persons or property.
Aftercooler
Separator
Typical System Configuration
Receiver
Prefilters
Figure 1
Dryer bypass piping may be installed to allow uninter-
rupted airflow during servicing. If the downstream appli-
cation cannot tolerate unprocessed air for short periods,
install a second dryer in the bypass line.
CAUTION — Do not hydrostatically test the piping
with the dryer in the system. The desiccant will be
damaged if saturated with water.
4.5 Electrical Connections
WARNING — These procedures require entering
gaining access to the dryer's electrical enclosure(s).
All electrical work must be performed by a qualified
electrical technician.
Connect the proper power supply to the dryer according
to the electrical drawings in the back of this manual. Be
sure to follow all applicable electrical codes.
NOTE: A disconnect switch is not provided as standard
equipment and therefore, must be supplied by the cus-
tomer.
Dry contacts (voltage free) are provided in the low ten-
sion electrical enclosure for a remote alarm. The contact
ratings are shown on the electrical drawing.
Connections to voltage-free common alarm contacts
with a minimum 5-amp rating can be made at terminals
TB4-1 through 3.
• Terminal TB4-3 is the common alarm connection.
• Terminal TB4-1 is the N.O.. (normally open) contact
connection.
• Terminal TB4-2 is the N.C. (normally closed) contact
connection.
• The alarm relay coil is energized when power is
supplied to the controller input terminals and there
is no alarms.
• The coil is de-energized when power is removed or
when an alarm condition exists.
• The common alarm is designed to activate on:
a) either a dryer fault condition or a service reminder,
or b) a dryer fault condition. This is user selectable.
Desiccant Dryer
Afterfilter
Receiver
3
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