6-20
Filter Drier Replacement
Refrigeration System Diagnosis and Service
CSR-20 & CSR-40, September 1999
Filter Drier/In-line Filter Replacement
NOTE: CSR Hermetic units use a one-piece, combi-
nation filter drier/in-line filter, P/N 66-9306.
Removal
1.
Recover the refrigerant charge from the unit (see
“Refrigerant Recovery” in this chapter).
2.
Unsolder the filter drier inlet and outlet connections.
3.
Remove the filter bracket clamping nuts and bolts.
4.
Remove the old filter drier from the unit.
Installation
1.
Clean the liquid line tubes for soldering.
2.
Remove the sealing caps from the new filter drier/in-line
filter.
3.
Place new filter drier in position.
NOTE: To prevent incorrect installation of the
dehydrator (or in-line filter), the inlet and outlet
fittings are different sizes.
4.
Solder inlet and outlet connections.
5.
Reinstall clamping brackets, nut and bolts. Tighten the bolts.
6.
Pressurize the refrigeration system and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
7.
If no leaks are found, recover the refrigerant used for the
leak test (see “Refrigerant Recovery” in this chapter).
8.
Evacuate the system (see “Evacuation and Cleanup of the
Refrigeration System” in this chapter).
9.
Recharge the unit with R-404A (see “Refrigerant Charge” in
this chapter). Then perform a controller Pretrip Test to
verify system operation.
Expansion Valve Replacement
NOTE: CSR hermetic units use a non-adjustable,
factory sealed expansion valve. Do NOT attempt to
remove the seal or adjust the valve.
Removal
1.
Recover the refrigerant charge from the unit (see
“Refrigerant Recovery” in this chapter).
2.
Remove insulating tape and unclamp feeler bulb from the
suction line in the condenser section. Note the position of
the feeler bulb on the side of the suction line.
3.
Remove insulating tape from expansion valve outlet line.
4.
Heat and unsolder the equalizer line from expansion
valve.
5.
Heat and unsolder the liquid line inlet and outlet connec-
tions to expansion valve in condenser section.
6. Remove expansion valve from unit.
Installation
1.
Clean the liquid lines and equalizer lines for soldering.
2.
Place new expansion valve in position in liquid line.
3.
Solder liquid line inlet and outlet line connections to
valve.
NOTE: Thermo King strongly recommends that
dry nitrogen be used to purge the system during
any solder operations (see “Using Pressurized
Nitrogen” in this chapter).
4.
Solder equalizer line to expansion valve.
5.
Pressurize the refrigeration system and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
6.
If no leaks are found, recover the refrigerant used for the
leak test (see “Refrigerant Recovery” in this chapter).
7.
Evacuate the system (see “Evacuation and Cleanup of the
Refrigeration System” in this chapter).
8.
Clean the suction line to a bright polished condition.
Install the feeler bulb of new power head in the feeler bulb
clamp on the suction line. Locate bulb on the suction line
in former position. The feeler bulb must make good con-
tact with the suction line or operation will be faulty.
Cover with insulating tape.
9.
Cover expansion valve outlet line with insulating tape.
10. Recharge the unit with R-404A (see “Refrigerant Charge” in
this chapter). Then perform a controller Pretrip Test to
verify system operation and correct feeler bulb installa-
tion.
