7. Install replacement compressor and make all connections.
8. Re-install the temperature thermistor at its original location (noted in step 4), which is within 6
inches of the compressor connection, and insulate making sure that the bulb makes good
contact with the discharge line.
9. Pressurize and leak-test the system.
10. Follow compressor manufacturer’s suggested clean-out procedures..
11. After completion of leak testing, release the test pressure, (observe local code) and pull an
initial deep vacuum of 500microns on the system with a suitable pump.
12. After 4 hours, check the pressure readings and, if they have not changed, break vacuum with
dry nitrogen. Pull a second and third vacuum to 500 microns or less, and verify that the
vacuum levels are maintained.
13. With the system in a 500micron or lower vacuum, charge the system based on the
requirements listed in Refrigerant Charge Requirements on page14.
8.3 Condensing Unit Maintenance
Restricted airflow will reduce operating efficiency and could result in high compressor-head pressure and
loss of cooling.
• Clear coil surface of all debris that will inhibit airflow.
• Check for bent or damaged coil fins and correct.
• Do not permit snow to accumulate around or under outdoor unit.
• Periodically consider commercial cleaning of coil surface
• Inspect fans, motors and controls for proper operation.
• Check all piping and capillaries for proper support.
• Inspect for leaks.
• Check contactors for pitting. Replace if pitted.
Vertiv | Liebert® PFD™ Installer/User Guide
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