Pumped Refrigerant System Operation and Maintenance10
The example below shows two RDUs employed to control three groups of CMs.
RDU
ID: 1
CM
Unit: 1
RDU: 1
Group: 1
CM
Unit: 2
RDU: 1
Group: 1
CM
Unit: 3
RDU: 1
Group: 1
CAN Bus
Liquid Supply
Vapor Return
RDU
ID: 2
CM
Unit: 1
RDU: 2
Group: 2
CM
Unit: 2
RDU: 2
Group: 2
CM
Unit: 3
RDU: 2
Group: 2
Group 1
CM
Unit: 1
RDU: 2
Group: 3
CM
Unit: 2
RDU: 2
Group: 3
CM
Unit: 3
RDU: 2
Group: 3
CM
Unit: 1
RDU: 1
Group: 2
CM
Unit: 2
RDU: 1
Group: 2
CM
Unit: 3
RDU: 1
Group: 2
Group 2
Group 3
Two RDUs, Three Groups
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