RTHD-SVX02H-EN 65
Installation Electrical
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.
D
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote dis-
connects and discharge all motor start/run capacitors
before servicing. Follow proper lockout/tagout pro-
cedures to ensure the power cannot be inadvertently
energized. Verify with an appropriate voltmeter that
all capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
All wiring must comply with local and National Electric
Codes. Minimum circuit ampacities and other unit elec-
trical 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.
Typical wiring diagrams are in the back of this manual.
D
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors may
result in equipment damage.
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 RTHD 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 open-
ing(s) on starter/control panel or pull-box. See CTV-
EB-93 for wire sizing and selection information and
refer to Table 18 that show typical electrical connec-
tion sizes and locations. Always refer to submittal
information for your actual unit specifications.
Table 18. 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 Conduit
6 Wire
2 Conduit
12 Wire
3 Conduit
9 Wire
4 Conduit
12 Wire
8 40 * * * * * *
6 52 * * * * * *
4 68 * * * * * *
3 60 * * * * * *
2 92 * * * * * *
1 104 * * * * * *
0 120 192 252 360 384 360 480
00 140 224 294 420 448 420 560
000 160 256 336 480 512 480 640
0000 184 294 386 552 589 552 736
250 204 326 428 612 653 612 816
300 228 356 479 684 730 684 912
350 248 397 521 744 794 744 992
400 268 429 563 804 858 804 1072
500 304 486 638 912 973 912 1216
Conductors to the starter and motor connected in parallel (electrically joined at both ends to form a single conductor) must be sized 0 (1/0)
or larger per NEC 310-4. Each phase must be equally represented in each conduit.
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