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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 500 microns 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 500 micron or lower vacuum, charge the system based on the
requirements listed in
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.
30
Refrigerant Charge Requirements
on page 14.
Vertiv | Liebert® PFD™ Installer/User Guide
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