Grounding; Overcurrent Protection - Nordyne P5RF-X24K Installation Instructions Manual

• The unit requires both power and control circuit electrical
connections. Refer to the wiring diagram / schematic for
identification and location of unit field wiring interfaces
(Figures 12 & 13). Make all electrical connections in
accordance with all applicable codes and ordinances.
• Overcurrent protection must be provided at the branch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes.
See the unit rating plate for minimum circuit ampacity
and maximum overcurrent protection limits.
• Use only copper wire for the line voltage power supply
to this unit as listed in Table 1. Use proper code agency
listed conduit and a conduit connector for connecting
the supply wires to the unit. Use of rain tight conduit is
recommended.
• 208/230 Volt units are shipped from the factory wired
for 230 volt operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
• Optional equipment requiring connection to the power
or control circuits must be wired in strict accordance
of the NEC (ANSI/NFPA 70), applicable local codes,
and the instructions provided with the equipment.
Line Voltage
Low Voltage
Figure 5. Power Entry

Grounding

WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with the
National Electrical Code (ANSI/NFPA 70) or CSA C22.1
Electrical Code. Ground the air conditioning unit using
the green grounding screw provided in the control panel.

Overcurrent Protection

Generally, the best fuse or breaker for any air conditioner
is the smallest size that will permit the equipment to run
under normal usage and provide maximum equipment
protection. Properly sized fuses and breakers also prevent
nuisance trips during unit startup. If a fuse blows or a
breaker trips, always determine the reason. Do not
arbitrarily install a larger fuse or breaker and do not,
in any case, exceed the maximum size listed on the
data label of the unit.
COPPER WIRE SIZE — AWG
(1% Voltage Drop)
Supply Wire Length-Feet
200 150 100
6 8 10
4 6 8
4 6 8
4 4 6
3 4 6
3 4 6
2 3 4
2 3 4
2 3 4
1 2 3
Wire Size based on N.E.C. for 60° type copper conductors.
Table 1. Copper Wire Size
Supply Circuit
Ampacity
50
14 15
12 20
10 25
10 30
8 35
8 40
6 45
6 50
6 55
4 60
7