CyberAiR DX Floor Mounted IOM Manual
2.8 Utility Connections
2.8.1
Main Power
It is important that the unit nameplate be examined to
determine the operating voltage, frequency and
phase of the system (see Figure 15). The nameplate
also provides the full load amps (FLA), the current the
unit will draw under full design load, the minimum
circuit ampacity (MCA) for wire sizing, and the
maximum fuse or HACR (Heating, Air Conditioning,
Refrigeration) breaker size (MAX FUSE/CKT BKR)
for circuit protection. The unit’s nameplate is located
inside the cabinet, within the electrical box.
Figure 15- Sample Nameplate
NOTE
If the nameplate states MAX FUSE/CKT BKR, it
is required to use fuses or a HACR type
circuit breaker to protect the system. Other
protection devices are not allowed based
upon the product listing.
2-13
The unit is provided with terminals for all required
field-wiring. Refer to the electrical schematic
supplied with the unit when making the power and
control field-wiring connections. It is important to
identify the options that were purchased with the
unit in order to confirm which field connections are
required.
CAUTION
Improper wire connections will result in the
reverse rotation of the scroll compressors
and may eventually result in damage to the
compressor. To correct this problem,
exchange any two of the incoming main power
wires at the main power disconnect switch. Do
NOT rewire the unit’s individual components.
WARNING
Verify power is turned off before making
connections to the equipment.
NOTE
All wiring must conform to local and national
electrical code requirements. Only use
copper conductors. Wiring terminations may
become loose during transit of the equipment;
therefore, it is required to verify that all wiring
terminations be checked to verify they are
secure.
It is important to verify that the main power supply
coincides with the voltage, phase and frequency
information specified on the system nameplate. The
supply voltage measured at the unit must be within
±10% of the voltage specified on the system nameplate.
Downflow units are provided with pilot holes in the
floor of the cabinet for the entry of the main power
and control field-wiring. If necessary, these holes may
be enlarged to properly fit the connector. A label
stating “MAIN POWER INPUT” is in close proximity.
As an option, piping and wiring may be routed
through the top of the cabinet.
For upflow units with top piping, pilot holes for entry
of power and control wiring are located in the top
of the cabinet. For upflow units without top piping,
pilot entrance holes are provided in the cabinet floor
or may be field drilled into a side wall if necessary.
See the installation drawing provided with your unit
for recommended entrance hole locations.
Route the main power wires into the electric box and
terminate the wires at the line side of the main power
disconnect switch as shown in the electrical drawing.
A
