6-18
Condenser Coil Replacement
Refrigeration Maintenance and Service Operations
CRR-20 & CRR-40, September 1999
Condenser Coil Replacement
Removal
1.
Recover the refrigerant charge from the unit (do NOT
vent refrigerant to the atmosphere).
2.
Remove the condenser fan grille, condenser fan blade and
condenser fan shroud.
3.
Remove the condenser coil support brackets from the coil.
4.
Unsolder the coil inlet and liquid line connections.
5.
Support the coil and unbolt the condenser coil mounting
brackets. Slide the coil from the unit.
Installation
1.
Clean the tubes for soldering.
2.
Slide the coil into the unit and install the bolts in the
mounting brackets.
3.
Solder the inlet line and liquid line connections.
NOTE: It is strongly recommended that dry nitro-
gen be used to purge the system during any sol-
der operations (see “Using Pressurized
Nitrogen” in this chapter).
4.
Pressurize the system and test for leaks (see “Refrigerant
Leak Test Procedure” in this chapter).
5.
If no leaks are found, recover the leak test gas (see
“Refrigerant Recovery” in this chapter).
6.
Then evacuate the system (see “Evacuation and Cleanup
of the Refrigeration System” in this chapter).
7.
Replace the condenser coil support brackets, condenser
fan shroud and condenser fan grille.
8.
Recharge the unit with R-134a refrigerant and check the
compressor oil level. Add oil if necessary.
Dehydrator (Filter Drier) or In-line Filter
Replacement
Removal
1.
Close the liquid line service valve and pump down the low
side. Open the outlet valve slightly to equalize the pres-
sure to 21 kPa, 0.21 bar, 3 psig.
2.
Place the new dehydrator (or in-line filter) near the unit
for immediate installation.
3.
Using two wrenches, “crack” both dehydrator (or in-line
filter) line mountings. Use two wrenches on flare fittings
to prevent line damage.
4.
Separate the dehydrator (or in-line filter) line mountings.
5.
Remove the filter bracket clamping nuts and bolts.
NOTE: Perform the following four procedures as
quickly as possible to prevent contamination.
6.
Remove the old dehydrator (or in-line filter) from the line.
Installation
1.
Remove the sealing caps from the new dehydrator (or in-
line filter).
2.
Apply clean compressor oil to dehydrator (or in-line filter)
threads.
3.
Assemble new dehydrator (or in-line filter) to lines.
Finger tighten mounting nuts.
NOTE: To prevent incorrect installation of the
dehydrator (or in-line filter), the inlet and outlet
fittings are different sizes.
4.
Reinstall clamping brackets, nut and bolts. Tighten the bolts.
5.
Tighten the dehydrator (or in-line filter) inlet line mount-
ing nut.
6.
Open the liquid line service valve on the inlet side of the
dehydrator (or in-line filter) slowly to release a small
amount of refrigerant from the receiver tank to purge the
air through the filter. Then tighten the outlet nut.
NOTE: When removing or replacing the o-ring
nuts on the dehydrator (or in-line filter), always
hold the body of the dehydrator (or in-line filter)
near the flange fittings to prevent twisting the
tubing when the nuts are being loosened or tight-
ened.
7.
Back seat (open) the liquid line service valve.
8.
Test the dehydrator (or in-line filter) for leaks (see
“Refrigerant Leak Test Procedure” in this chapter).
9.
If no leaks are found, place the unit in operation.
Summary of Contents for CRR-20
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