Trane Symbio CVRF Installation Instructions Manual page 35

Figure 45. Mounting starter sub-box
Starter control and power wires are connected to the terminal
block on the right side of the sub-panel. CTs and starter module
communications and power wires are connected directly to
starter module on the left side.
Figure 46. Starter sub-panel
Medium voltage potential transformer outputs are directly
wired to starter module current inputs L1, L2, and L3 per the
schematic drawing. Low voltage L1, L2, and L3 potential
signals are connected to the potential transformer white and
black leads on the sub-panel in the order below.
Note: If replacing a UCP2 starter module, you can remove
and discard the 27 VAC UCP2 starter module
transformer as it is not required for the CH530 type
starter module operation.
CVRF-SVN005C-EN
Figure 47. Low voltage potential transformer
connections
IMPORTANT NOTE FOR WYE DELTA AND AUTO
TRANSFORMER STARTER APPLICATIONS
Per the schematics, Wye Delta and Auto Transformer starter
require normally closed contactor interlock signals for proper
operation. In the case that the starters do not have available
auxiliary contacts, pilot relays can be substituted per the
schematic notes below. If space is available, the relay(s) can
be mounted on the sub-panel bracket.
Figure 48. Pilot relay terminal locations
Starter Work
35