User Guide

1. Determine the extent of the burnout. For mild burnouts
where contamination has not spread through the system,
it may be economical to save the refrigerant. Normally
it is not economical to save the refrigerant charge if the
system used less than 25 pounds of refrigerant.
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 caution should
be exercised to avoid breathing the acid vapors and avoid
contact with the skin of contaminated liquid. Dispose of
the contaminated refrigerant in a caustic solution.
2. Thoroughly clean and replace all system controls such as
thermal expansion valves, solenoids, check valves, re-
versingvalves,etc.Removeallstrainersandlter-driers.
3. Install replacement compressor and make a complete
electrical check.
4. Make sure the suction line adjacent to compressor is
clean. Install an Emerson STAS suction line shell com-
pletewithnewlter-drierblocks.Installanewoversized
Emersonliquidlinelter-drier.
5. Pressurize and leak-test the system according to unit
manufacturer’s recommendations.
6. Triple evacuate to a least 50 microns. Break the vacuum
with clean, dry refrigerant at 0 psig.
7. Charge the system to equipment manufacturer’s recom-
mendations.
Compressor Motor Burnout Clean-Up Procedure Suction Line Filter-Drier Method
8. Start the compressor and put the system in operation.
Record the pressure drop across the STAS suction line
shell on the enclosed label and apply to the side of the
shell.
9. Replacethesuctionlinelter-drierblocksifthepressure
drop becomes excessive.
10.Observethesystemduringtherstfourhours.Repeat
step 9 as often as required until no further change in
pressure drop is observed.
11. After the system has been in operation for 48 hours,
check the condition of the oil with the Acid Alert test kit.
If the oil test indicates an acid condition, replace both the
liquidandsuctionlinelter-drier.
12. Check the system again after approximately two weeks
of operation. If the oil is still discolored, replace the liquid
andsuctionlinelter-drier.
13. Clean-up is complete when the oil is clean and odor free,
and is determined to be acceptable with the Acid Alert
test kit.
14.Replacethesuctionlinelter-drierblockswithsuction
linelterstominimizesuctionlinepressuredrop,butstill
providing compressor protection.
For detailed burnout clean-up procedure and recommenda-
tions, consult the RSES Service Manual Section 91.
NOTE: Allow the liquid-line lter-drier to remain in the
system for continued compressor protection.
STAS Series Specications
Filter-Drier Service Suction Filter Service
STAS Required Desiccant
Shell # of Blocks Filter-Drier Volume Filter Area Suction Filter Area
or Cores Blocks Cu. In. Sq. In. Filter Sq. In.
STAS-48 1 48 69 105
STAS-96 2 96 138 F-48 210
STAS-144 3 144 207 F-48R 315
STAS-192 4 192 276 420
D-48
H-48
W-48