Carrier 48HC Units Without Disconnect Option, Units With Disconnect Option

20
FIRE HAZARD
Failure to follow this warning could result in
intermittent operationor unsatisfactory performance.
Do not connect aluminum wire between disconnect
switch and air conditioning unit. Use only copper
wire.(SeeFig.24.)
!WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 24 --Disconnect Switch and Unit
Unitswithout Factory--InstalledDisconnect —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
Disconnect sizing data is provided on the unit informati ve
plate. Locate on unit cabinet or within sight of the unitper
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
Unitswith Factory--InstalledDisconnect —
The factory--installed option disconnect switch is located
in the main control box. The manual switch handle is
accessible on the corner postadjacent to the control box
access panel.
All Units --
All field wiringmust comply with NEC and all local code
requirements.
Size wire based on MCA (Minimum CircuitAmps) on the
unit informative plate. See Fig. 25 for power wiring
connections to the unit power terminal block and equipment
ground. Maximum wire size is 2/0 AWGper pole.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over--currentProtection) device size.
Voltageto compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table11. On 3--phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shownin the legend for Table 11 (see Note2
on page 49) to determine the percent of voltage
imbalance.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalida te
any applicable Carrier warranty.
CAUTION
!
11 12 13
L1 L2 L3
TB1
208/230-3-60
460-3-60
575-3-60
Units Without Disconnect Option
Units With Disconnect Option
T1 T2 T3
L1 L2 L3
L1 L2 L3
Factory
Wiring
Disconnect
per
NEC
Optional
Disconnect
Switch
C101000
Fig. 25 --Power Wiring Connections
Convenience Outlets —
ELECTRICALOPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Lock--outand tag--outthi sswitch, ifnecessary.
!WARNING
48HC