Heatcraft Refrigeration Products PARALLEL COMPRESSOR SYSTEMS 25000102 - Manual (Page 29)

Parallel Compressor Systems Installation & Operations Manual, October 2004 29
Parallel Compressor Systems
Suction Filter
Replaceable core suction filters are supplied as standard
on all units. The flanged shell holds replaceable pleated
filter elements suitable for installation in the suction line of
refrigeration systems. In this way any contaminants left in the
system at start-up can be removed before they circulate back
to the compressor. The suction filters are shipped loose for
field installation. (See No. 3 of Leak Checking, Evacuation, and
Start-up section in this manual).
Compressor Motor Burnout Cleanup Procedure
Another benefit of the suction filter is its use in cleanup of a
system after a burnout. Standard liquid cores can be installed in
the shell to aid in the cleanup of acids and other contaminants
from a motor burnout.
The following procedure can be used in case of a motor
burnout.
1. Determine the extent of the burnout. For mild burnout’s
where contamination has not spread through the system,
it may be economical to save the refrigerant. Normally
it is economical to save the refrigeration charge if the
system has service valves. A severe burnout exists if the oil
is discolored, an acid odor is present and contamination
products are found in the high and low side. With this
condition, extreme caution should be exercised to avoid
breathing the acid vapors and to prevent contaminated
liquid from making contact with the skin.
2. Thoroughly clean and replace all system controls, such
as expansion valves, solenoids, check valves, reversing
valves, oil separators, suction accumulators, etc. Remove
all strainers and filter-driers.
3. Install a replacement compressor and make a complete
electrical check.
4. Make sure the suction line adjacent to the compressor
is clean. Install a liquid line filter-drier or a replaceable
cartridge designed for “cleanup” into the suction line
shell.
5. Install a burnout core in the liquid line shell.
6. If the refrigerant is removed from the system, follow the
evacuation procedure found on page 17 of this manual.
7. Start the compressor and put the system in operation.
Record the pressure drop across the suction line filter and
keep for reference.
8. Replace the suction line filter-drier blocks if the pressure
drop becomes excessive.
9. Observe the system during the first 4 hours. Repeat step
8 as often as required, until no further change in pressure
drop is observed.
10. After the system has been in operation for 48 hours, check
the condition of the oil for Acids. If the oil test indicates an
acid condition, replace the liquid and suction line filter-
driers.
11. Check the system again after approximately 2 weeks of
operation. If the oil is still discolored, or checks acid, replace
the liquid and suction line filter-driers.
12. Cleanup is complete when the oil is clean, odor free, and is
determined to be acceptable by testing for acids or other
contaminants.
13. Replace the suction line filter-drier with suction line filters
cores to minimize suction line pressure drop and to provide
maximum compressor protection.
For more detailed information on burnout cleanup procedures
and recommendations, consult the RSES Service Manual,
section 91.
Sporlan Valve Company
Replaceable Suction Filter
The correct replacement suction filter element in Sporlan Valve
replaceable shells is Sporlan part number RFE-48-BD. However
any suitable filter that is sized to fit a 48 cu. inch vessel will
substitute.