Van Air Systems FR-1200 - Manual (Page 11)

PAGE 11
MAINTENANCE SECTION 9
9.8 CLEANING THE Y-STRAINER
Shutdown and depressurize dryer system per SECTION 7.
Remove the air supply hose from the dryer system inlet connection.
Remove the cap/plug from the strainer.
Clean the screen and Y-strainer body. Take care to remove all
debris that may have fallen out of the Y-strainer into the dryer
system piping.
Reinstall the screen and the cap/plug. Replace the gasket if
necessary. See SECTION 11.3 for part number.
Place the dryer system on-stream per SECTION 5.1.
9.7 CLEANING THE INTERIOR OF THE PRE-COOLER
The inside of the pre-cooler core should be cleaned periodically if the
process air has an excessive amount of lubricating fluids. Excess
lubricating fluids can build up on the inside of the core and greatly
reduce the efficiency of the pre-cooler.
Shut down the dryer system per SECTION 7 and completely
depressurize the dryer system. Disconnect the core from the air
system.
The interior of the core can be cleaned by circulating a mild cleaning
solution through the core to remove the deposits. In most cases, a
mild alkaline solution such as OAKITE or equal is satisfactory. For
extreme conditions, it may be necessary to use a weak solution of
INHIBITED hydrochloric acid. Circulate the solution through the core
until it is clean. Once the core is clean, thouroughly rinse the core to
remove all traces of the cleaning solution before re-connecting it to the
air system.
9.6 CLEANING THE EXTERIOR OF THE PRE-COOLER
The pre-cooler core should be cleaned regularly. Accumulation of dirt
or other contaminants shch as oils will greatly reduce the efficiency of
the pre-cooler.
Normal accumulation of dirt can be removed by using compressed air
to blow off the core. If the core becomes contaminated with oil-laden
particles, it will need to be steam cleaned. Use extreme care when
cleaning the core as the aluminum fins can be easily damaged.
9.5 REPLACING SEPARATOR/PREFILTER, PREFILTER,
AND AFTERFILTER ELEMENTS
Shutdown and depressurize dryer system per SECTION 7.
Disconnect drain line as required.
Remove filter bowl by turning it counterclockwise (as viewed from
below). Pull element from filter head. Set bowl aside for use later.
Remove new element from packaging and make sure o-ring is in
place on element end cap. See SECTION 11.3 for replacement
element part number.
Install new element by pushing element onto filter head.
Inspect the head to bowl o-ring for nicks and/or cracks. If nicks
or cracks are present, replace the o-ring. Re-install the o-ring
in the filter head and make sure that it is in the proper position.
Thread filter bowl into filter head and tighten with strap wrench.
Do not over tighten. Overtightening could damage filter bowl or
make it difficult to remove.
SEPARATOR/PREFILTER - Make sure the ball valve on bottom
of separator/prefilter is open, so the auto drain will function. Re-
connect drain line to the fitting in the bottom of the filter.
PREFILTER - Make sure the ball valve on bottom of filter is
slightly cracked open. Reconnect drain line to the fitting in the
bottom of the filter.
AFTERFILTER - Make sure the ball valve on the bottom of the
filter is closed.
Place dryer system on stream per SECTION 5.1.
IMPORTANT
Leave prefilter valve slightly cracked open to allow for constant
draining or drain the prefilter daily.