SXIH-SVX01C-EN
17
Installation
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
Supply Power Wiring
It is the installer's responsibility to provide power supply wiring to the unit. Wiring should conform
to NEC and all applicable code requirements. To ensure the unit supply power wiring is properly
sized and installed, follow the guidelines below:
1.
Verify the power supply available is compatible with the unit nameplate ratings. The supply
power must be within 10% of the rated voltage listed on the unit nameplate.
2. Reference the electrical data.
refers to standard motor, and
refers to oversized
motor. Protect the electrical service from over current and short circuit conditions in accordance
with NEC requirements. Size protection devices according to the electrical date on the unit
nameplate.
3. If using a field-supplied disconnect, install it at or near the unit in accordance with NEC. Do not
mount a field-supplied disconnect on the unit. Reference the electrical service entrance location
on unit submittals.
4. Complete the unit power wiring connections onto either the main terminal block or the field-
provided non-fused disconnect switch.
5. Provide proper unit grounding in accordance with local and national codes.
Electrical Data Calculations
RLA = Rated Load Amps
Compressor LRA = Locked Rotor Amps
Fan Motor LRA = Locked Rotor Amps, N.E.C. Table 430 - 151
FLA = Full Load Amps, N.E.C., Table 430 - 150
Voltage utilization range is ±10 percent
Determination of Minimum Circuit Ampacity (MCA)
MCA = 1.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.
Determination of Maximum Fuse Size (MFS)
MFS = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.
If the rating value determined does not equal a standard current rating of over current protective
device, use the next lower standard rating for the marked maximum rating.
electrical requirements
