Gardner Denver RGD Series, Instruction Manual

Page: 4 / 24

2
Compressor
Oil Removal
Filter
Aftercooler
Automatic Drain
Dryer
Separator Receiver
TYPICAL COMPRESSED AIR SYSTEM
INSTALLATION
Ambient Air Temperature
Locate the dryer indoors where the ambient air temperature will
be between 37°F and 110°F. Intermittent operation at ambient
temperatures up to 113°F will not damage the dryer but may
result in a higher dew point or dryer shutdown due to high
refrigerant discharge pressure (see Field Service Guide).
Do not operate air-cooled dryers at ambient air temperatures
below 40°F. Such operation may result in low suction pressure,
causing freeze-up.
Location and Clearance
Mount the dryer on a level base. If the base vibrates, bolt the
unit down using vibration dampeners. Allow at least 24 inches
clearance on the sides and the front of the dryer for cooling
airflow and for service access.
System Arrangement
Liquid water in the inlet air will adversely affect the performance
of the dryer. Install the dryer downstream of an aftercooler or
separator so that the temperature of the dryer inlet air does not
exceed 120°F and the inlet air does not contain any liquid water.
If the compressed airflow is relatively constant and does not
exceed the dryer flow rating, it is recommended that the dryer
be located downstream of the receiver tank. If the nature of the
application is such that the air demand regularly exceeds the
dryer flow rating, it is recommended that the dryer be located
upstream of the receiver.
For safety and convenience, install inlet and outlet shutoff valves
and depressurization valves. These valves allow the dryer to be
isolated and depressurized for servicing. Bypass piping may
be installed around the dryer for uninterrupted airflow when
the dryer is serviced. If the compressed air operation cannot
tolerate undried air for short periods, install a second dryer in
the bypass line.
Compressed air systems commonly require filters to remove
compressor oils, particulates, condensed liquids and other
contaminants. When an oil-removal filter is used, it should be
installed downstream of the refrigerated dryer. At this location,
the life of the replaceable filter element is prolonged since
some of the entrained oil is removed by the dryer and drained
through the separator.
Piping and Connections
Piping must be furnished by the user unless otherwise speci-
fied. Connections and fittings must be rated for the maximum
operating pressure given on the dryer data plate and must be
in accordance with applicable codes. Support all piping; do not
allow the weight of any piping to stress the dryer or filter con-
nections. Inlet and outlet shutoff valves and a valved bypass
valve are recommended. Piping should be at least the size of
the inlet and outlet connections to minimize pressure drop in
the air system. See Engineering Data section for dryer inlet and
outlet connections.
Removing Condensate
Condensate must be drained from the dryer to prevent re-
entrainment. The dryers are equipped with automatic drain
valves and internal drain hoses up to the drain connections on
the dryer cabinets. The user must install a separate discharge
line at the drain connection to carry off condensate to an envi-
ronmentally approved condensate collection/disposal system.
Piping or copper tubing 1/2 inch or larger is recommended
for condensate discharge lines. Install the drain lines so that
condensate can be seen as it drains.
Electrical Connections
The dryers are constructed according to NEMA Type 1 electrical
standards. Field wiring must comply with local and national fire,
safety and electrical codes. Installation must be in accordance
with the National Electrical Code. Confirm that your line voltage
is the same as the voltage listed on the dryer data plate. Refer
to Figure 1 for electrical schematics.
Operation of dryers with improper line volt-
age constitutes abuse and could affect the dryer war-
ranty.