b. After four hours, check the pressure readings and, if they have not changed, break vacuum with dry
nitrogen. Pull a second and third vacuum to 65 Pa(a) or 500 microns or less. Re-check the pressure after
two hours.
NOTE: The Fan/Power Failure alarm can be generated. This does not affect normal operation.
NOTE: Never use the compressor to evacuate the system. This invalidates its guarantee.
Figure 7.1 Schrader Valves in the System
Item
Description
Item
Description
1
Condenser coil
11
Schrader valve
2
Ball valve
12
Suction temperature sensor
3
Schrader valve
13
High pressure sensor
4
Check valve
14
Schrader valve
5
High pressure switch
15
Dry filter
6
Temperature sensor
16
Sight glass
7
Discharge pipe
17
Solenoid valve
7 Start-up
52
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual