Thermo King 098916, Maintenance Manual

Page: 148 / 196

Refrigeration Maintenance
147
Economizer Heat Exchanger
Replacement
Economizer Heat Exchanger
Removal
Remove the economizer heat exchanger by
performing the following steps:
1. Recover the refrigerant charge from the unit
(see “Recovering Refrigerant” in this chapter).
2. Unsolder the two liquid and two suction line
connections.
3. Unbolt the economizer heat exchanger from
the mounting bracket.
4. Lift the heat exchanger assembly from the
unit.
Economizer Heat Exchanger
installation
Install the heat exchanger by performing the
following steps:
1. Bolt the economizer heat exchanger to the
mounting bracket in the condenser section.
2. Clean the two liquid and two suction lines for
soldering.
3. Solder the liquid and suction lines to the
economizer heat exchanger.
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. Pressurize the low side and check for leaks
(see “Refrigerant Leak Test Procedure” in this
chapter).
5. If no leaks are found, recover the leak test gas
(see “Refrigerant Leak Test Procedure” in this
chapter).
6. Evacuate the low side (see “Evacuation and
Cleanup of the Refrigeration System” in this
chapter).
7. Recharge the unit with R-404A (see
“Charging the System with Refrigerant” in
this chapter).
8. Perform a controller pretrip test to verify
system operation.