Van Air Systems FR-400 - Manual (Page 12)

PAGE 12
MAINTENANCE SECTION 9
9.7 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 locator. 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 onto element locator on 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. Check to make sure that the o-ring in the head
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 bot-
tom of separator/prefilter is open, so the auto drain will function.
Reconnect drain line to the auto drain.
PREFILTER - Make sure the ball valve on bottom of prefilter is
open, so the auto drain will function. Reconnect drain line to
the auto drain.
AFTERFILTER - Make sure the ball valve on the bottom of the
filter is closed.
Place dryer system on stream per SECTION 5.1.
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.
9.6 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.