Refrigeration Service Operations
146
System Clean-up
Existing clean up devices such as suction line
filter P/N 204-498, adapters and manifold
P/N 204-500, and compressor oil filters may be
used if they are thoroughly cleaned and new filter
elements are installed. All standard compressor
oils must be removed from clean-up devices to
prevent contamination of R-404A systems.
Dangerous contamination will result if other
refrigerants or standard oils are introduced to
R-404A systems.
NOTE: For additional information on parts and
supplies, consult your local Thermo King dealer
and the Thermo King Tool Catalog.
Refrigerant Recovery
Present systems can be adapted to the recovery of
R-404A but should be dedicated to the recovery of
these refrigerants. Consult the manufacturer of
your recovery equipment for details.
Throttling Valve
Removal
1. Pump down the unit using the refrigerant
recovery system.
2. Front seat the suction service valve. Release
remaining pressure.
3. Remove the suction valve and line.
4. Unbolt and remove the throttling valve from
the unit.
Disassembly
1. Remove the piston end cap.
2. Remove the cotter pin from the castle nut and
remove the nut.
3. Remove the spring and piston.
4. Loosen all the bolts on bellows end cap.
5. Break the gasket free and remove the end cap.
6. Note the number of shims next to the cap.
These can be reused.
7. Remove bellows (discard).
8. Inspect all the parts (replace if excess wear is
found).
a. Piston and cap for wear (scuff marks)
b. Body for stripped threads
c. Bellows end cap for damage in pilot hole
NOTE: Bellows is normally replaced.
.
CAUTION: This end cap is under slight
spring pressure.
1. Inspect Cap
2. Inspect Spring
3. Shims
Figure 168: Throttle Valve, Cap and Spring
1. Inspect for Wear
Figure 169: Throttle Valve Piston
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