CSR-20 & CSR-40, September 1999
Refrigeration System Diagnosis and Service
Condenser Coil Replacement
6-19
6.
Clean the tubes for soldering. Position the new valve in
position in the suction line.
7.
Solder both modulation valve connections.
CAUTION: Use a heat sink or wrap the valve with
wet rags to prevent damage to the new valve.
8.
Pressurize the refrigeration system and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
9.
If no leaks are found, recover the refrigerant used for the
leak test (see “Refrigerant Recovery” in this chapter).
10. Evacuate the system (see “Evacuation and Cleanup of the
Refrigeration System” in this chapter).
11. Plug the coil wire harness into the unit wire harness.
12. 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.
Condenser Coil Replacement
Removal
1.
Recover the refrigerant charge from the unit (see
“Refrigerant Recovery” in this chapter).
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 liquid inlet and outlet connections.
5.
Support the coil and unbolt the condenser coil mounting
brackets. Slide the coil from the unit.
6.
Drain and measure any compressor oil that may be
trapped in the condenser coil.
Installation
1.
If compressor oil was drained from the condenser coil,
add a equal amount of new compressor oil to the new coil.
CAUTION: Use ONLY Polyol Ester based refrig-
eration compressor oil, P/N 203-433. Keep
Polyol Ester based compressor oil in tightly
sealed containers. If Ester based oil becomes
contaminated with moisture or standard oils, dis-
pose of properly — DO NOT USE!
2.
Clean the tubes for soldering.
3.
Slide the coil into the unit and install the bolts in the
mounting brackets.
4.
Solder the inlet line and liquid line connections.
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).
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.
Replace the condenser coil support brackets, condenser
fan shroud and condenser fan grille.
9.
Recharge the unit with R-404A (see “Refrigerant Charge” in
this chapter). Then perform a controller Pretrip Test to
verify system operation.
