control box. The manual switch handle is accessible
through an opening in the access panel.
All Units -
All field wiring must comply with NEC and all local codes.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 9 for power wiring
connections to the unit power terminal block and equipment
ground. Maximum wire size is #4 ga AWG per pole.
Provide a ground-fault and short-circuit over-current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over-current Protection) device size.
Units Without Disconnect Option
c TB1
I I I
_ J.=_L__I__
I Disconnect I
I per I
I NEC I
=7--r--r-
L1 L2 L3
208/230 3 60
460 3 60
575 3 60
El ....
L2 ....
L3 ....
Units With Disconnect Option
,@ DiOPcfi°n;Ict @_ } _i;ti°g y
swi,ch
DisConnect factory test leads; discard.
010204
Fig. 9 - Power Wiring Connections
electrical components. Such operation would invalidate
any applicable Carrier warranty.
Convenience Outlets
ELECTRICAL OPERATION 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 opining unit for service. Locate its
disconnect switch, if appropriate, and open it. Tag-out
this switch, if necessary.
Two types of convenience outlets are offered on 38AUQ
models: Non-powered and unit-powered. Both types
11
provide a 125-volt GFCI (ground-fault circuit-interrupter)
duplex receptacle rated at 15-A behind a hinged
waterproof access cover, located on the end panel of the
unit. See Fig. 10.
Convenience _;L>]
Outlet '
GFCI _'SJ*_ I
I
Pwd-CO
Fuse I
30
Transformer
)1Box
Access Panel
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the 1/4-in. female spade connector from the 230-v
connection and moving it to the 208-v 1/4-in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information.
All field wiring must comply with the NEC and local
requirements.
Voltage and Current Balance --
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 8. On 3-phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shown in the legend for Table 8, Note 5 (see
page 14) to determine the percent of voltage imbalance.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
C11038
Fig. 10 - Convenience Outlet Location
Non-powered type: This type requires the field
installation of a general-purpose 125-volt 15-A circuit
powered from a source elsewhere in the building. Observe
national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and
location. Route 125-v power supply conductors into the
bottom of the utility box containing the duplex receptacle.
Unit-powered type: A unit-mounted transformer is
factory-installed to stepdown the main power supply
voltage to the unit to l15-v at the duplex receptacle. This
option also includes a manual switch with fuse, located in
a utility box and mounted on a bracket behind the
convenience outlet; access is through the unit's control
box access panel. See Fig. 10.
The primary leads to the convenience outlet transformer
are not factory-connected. Selection of primary power
source is a customer-option. If local codes permit, the
13
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