Economizer Heat Exchanger Replacement

Removal

Recover the refrigerant charge from the unit (Refer to Recovering Refrigerant from System).
Unsolder the two liquid and two suction line connections.
Unbolt the economizer heat exchanger from the mounting bracket.
Lift the heat exchanger assembly from the unit.

Bolt the economizer heat exchanger to the mounting bracket in the condenser section.
Clean the two liquid and two suction lines for soldering.
重要 Thermo King strongly recommends that dry nitrogen be used to purge the system during any solder operations (Refer to Using Pressurized Nitrogen).
Solder the liquid and suction lines to the economizer heat exchanger.
Pressurize the low side and check for leaks (Refer to 制冷系统泄漏测试).
If no leaks are found, recover the leak test gas (Refer to 制冷系统泄漏测试).
Evacuate the low side (Refer to 制冷系统的排放和清洁).
Recharge the unit with R-404A/R-452A (Refer to 为设备注入制冷剂).
Recharge the unit with R-134a/R-513A (Refer to 为设备注入制冷剂).
Perform a controller pretrip test to verify system operation.