Van Air Systems HL-2500 - Manual (Page 5)

PAGE 5
INSTALLING THE DRYER SECTION 4
Basic bypass piping should include an inlet isolation valve, a bypass
valve, and an outlet isolation valve. The isolation and bypass valves
must be bubble-tight.
4.2-2 FILTERS
CAUTION
A PROPERLY RATED COALESCING PREFILTER MUST BE
INSTALLED BEFORE THE DRYER TO REMOVE LUBRICATING
OILS, DUST AND PIPE SCALE CONTAMINATION. FAILURE TO
USE A PREFILTER WILL RESULT IN DAMAGE TO THE DRYER
AND VOIDS THE WARRANTY.
Make sure that the elements are installed in all filter housings
prior to start up.
THE DRYER AND PREFILTER ARE NOT DESIGNED TO HANDLE
LIQUID WATER. IF LIQUID WATER IS PRESENT IN THE AIR
SYSTEM, A SEPARATOR WITH AN AUTOMATIC DRAIN MUST BE
INSTALLED UPSTREAM TO THE PREFILTER AND DRYER TO
PREVENT FLOODING.
A coalescing prefilter must be installed before the dryer to remove
lubricating oils, dust and pipe scale contamination. It is recommended
that a high efficiency coalescing filter with an automatic drain or
electric drain valve be installed. The filter should be equipped with a
pressure differential indicator to monitor the condition of the element.
A particulate afterfilter should be installed downstream of the dryer to
remove any desiccant dust. The filter should be equipped with a
pressure differential indicator to monitor the condition of the element.
Make sure that the filters are properly installed according to the
instructions provided with them.
4.3 INSTALLING THE PRESSURE RELIEF VALVES
CAUTION
THESE ASME CODE VESSELS MUST BE PROTECTED BY
PRESSURE RELIEF VALVES. Refer to OSHA 1910.169 Par. b,
Sub. Par (3) and ASME Boiler and Pressure Vessel Code, Section
VIII, Division 1, UG-125 through UG-136. Also check government
regulations, i.e., state and local codes.
Connections are provided on the top of the vessels for the installation
of pressure relief valves. Reference SECTION 3.2 for location and
connection size.
Install the pressure relief valves into the provided connections. If
pressure relief valves were not purchased with the dryer, they are
available from your local VAN AIR representative under part number
14-0990 quantity 2.
4.1 LOCATION
WARNING
DO NOT INSTALL THIS DRYER IN AN ENVIRONMENT OF
CORROSIVE CHEMICALS, EXPLOSIVE GASSES, POISONOUS
GASSES, OR SATURATED STEAM HEAT.
Locate dryer in a protected, well vented area where ambient
temperatures are between 40
o F and 120 o F. Allow sufficient clearance
over and around the dryer for access to desiccant fill and drain ports
and controls. Refer to SECTION 3.2 for dryer dimensions.
If this dryer must be installed where ambient temperatures are below
40
o F, insulation and heat tracing must be properly installed on the inlet
piping, purge exhaust line and the desiccant towers to prevent freezing
of the equipment.
Position the dryer in the upright position on a solid, level, vibration free
surface capable of supporting the dryer’s weight. Refer to SECTION
3.1 for dryer specifications.
The dryer should not be located in extremely dirty areas where
airborne contaminants can accumulate on the dryer. If this cannot be
prevented, the dryer should be cleaned periodically.
4.2 PIPING AND ANCILLARY EQUIPMENT
CAUTION
Make sure that the inlet air piping is connected at the bottom and the
outlet air piping is connected at the top of the dryer.
Make sure that the inlet and outlet piping to and from the dryer is
properly supported. Excessive stress may cause damage and/or
dryer malfunction.
Remove protective caps or covers from all valves before installing this
dryer.
If this dryer is to be installed into an existing piping system, clean the
existing inlet piping to remove all accumulated dirt, pipe scale, etc.,
before connecting the dryer. Make sure that the inlet and outlet
shutoff valves are tightly closed before connecting to the existing
piping system.
If excessive vibrations are present in the piping, install a flexible hose
between the compressor and the dryer inlet.
When installing the piping and any additional components, make sure
that adequate pipe supports are used. Excessive stress on the dryer
and components may cause damage or premature failure. Use either
overhead or stiff-leg type supports.
Make sure that the piping is correctly connected to the dryer. The inlet
is the bottom connection and the outlet is the top connection.
Reference SECTION 3.2 for dryer dimensions and connection
locations.
Once the location has been determined, place the dryer into position.
Lift the dryer by the lifting lugs only. Reference SECTION 1 for
handling instructions.
When the dryer is in place, it can be fastened to the mounting surface.
Reference SECTION 3.2 for dryer dimensions.
4.2-1 BYPASS PIPING (optional)
The installation of bypass piping is not required, but will allow the
dryer and filters to be taken off stream without interrupting the air
system.
In Figure 4A, several recommended bypass piping layouts and
additional components are shown.