Installation, Operation and Maintenance 3 - 1
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General Recommendations
For proper electrical component operation, do not
locate the unit in areas exposed to dust, dirt,
corrosive fumes, or excessive humidity. If any of
these conditions exist, corrective action must be
taken.
WARNING
Hazardous Voltage! Disconnect all
electrical power, including remote
disconnects before servicing. Fail-
ure to disconnect power before
servicing can cause severe per-
sonal injury or death.
All wiring must comply with local and National
Electric Codes. Minimum circuit ampacities and other
unit electrical data is on the unit nameplate. See the
unit order specifications for actual electrical data.
Specific electrical schematics and connection
diagrams are shipped with the unit.
NOTE: typical wiring diagrams are in the back of this
manual.
CAUTION
CAUTION: It is strongly recom-
mended that only copper conductors
be used! Unit terminals are not
designed to accept other types of
conductors. Failure to do so may
cause damage to the equipment.
Do not allow conduit to interfere with other
components, structural members or equipment. All
conduit must be long enough to allow compressor
and starter removal.
NOTE: To prevent control malfunctions, do not run
low voltage wiring (<30V) in conduit with conductors
carrying more than 30 volts.
Power Supply Wiring
Model RTHC chillers are designed according to NEC
Article 310-15; therefore, all power supply wiring
must be sized and selected accordingly by the
project engineer.
For a complete discussion on the use of conductors,
see Trane Engineering Bulletin EB-MSCR-40.
Refer to Trane Engineering Bulletin CTV-EB-93 for
power wire sizing.
Water Pump Power Supply
Provide power supply wiring with fused disconnect
for both the chilled water and condenser water
pumps.
Electrical Panel Power Supply
Power supply wiring instructions for the starter/
control panel are:
1 Run line voltage wiring in conduit to access
opening(s) on starter/control panel or pull-box.
See CTV-EB-93 for wire sizing and selection
information and refer to
Table 12
and
Figure 22
that show typical electrical connection sizes and
locations. Always refer to submittal information for
your actual unit specifications.
Table 12
Wire Selection Chart for Starter Panels
Min. Wire
Size
Copper 75
°
C
Supply Leads for All Starters (0 - 2000 Volts)
1 Conduit
3 Wire
1 Conduit
6 Wire
1 Conduit
9 Wire
2 Conduits
6 Wire
2 Conduits
12 Wire
3 Conduits
9 Wire
4 Conduits
12 Wire
840
******
652
******
468
******
360
******
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