9.5.2 Replacement Compressors
Replacement compressors are available through your Vertiv sales office. If the unit is under warranty, the replacement
compressor must be obtained from and the original compressor returned to your local Vertiv sales office. Compressors are
shipped in reusable packaging, and the original compressor should be returned in the same packaging.
9.5.3 Rotalock Valve on Digital Scroll Compressors
CAUTION: Risk of explosive discharge of high pressure refrigerant. Can cause serious injury. Neutral and
service ports on the rotalock valve do not have a valve core. Front seat the service valves and relieve pressure
from the compressor before loosening a part or a component attached to the service valve. Follow local codes
to properly reclaim refrigerant.
• The Neutral port remains open to the compressor side in all positions of the valve stem, see Figure 9.1 below.
A high pressure cut out switch or low pressure switch/transducer will be connected to this port.
• The Service port is closed to the system when valve stem is back-seated, see Figure 9.1 below. It is open to
the system as soon as the valve is adjusted away from the back seated position.
Figure 9.1 Rotalock Valve
Item Description
1 Service port (gauge)
2 Front seat
3 Back seat
4 Compressor side of valve
5 Neutral port
6 System side of valve
9.5.4 Unloading Solenoid(s) on a Digital Scroll Compressor
When replacing a digital scroll compressor, the digital solenoid valve and coil must be replaced. The compressor and valve
kit are shipped separately. The valve kit must be field brazed to the top of the compressor in proper orientation and
supported with the original factory bracket.
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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