Carrier 38AUZ - Manual (Page 10)

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leads according to required operation of the convenience outlet.
If an always-energized convenience outlet operation is desired,
connect the source leads to the line side of the unit-mounted
disconnect. (Check with local codes to ensure this method is
acceptable in your area.) If a de-energize via unit disconnect
switch operation of the convenience outlet is desired, connect
the source leads to the load side of the unit disconnect. On a
unit without a unit-mounted disconnect, connect the source
leads to the factory connection leads (pigtails) in the unit’s
main control box (see Fig. 8).
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 ¼-in. female
spade connector from the 230-v connection and moving it to
the 208-v ¼-in. male terminal on the primary side of the
transformer. Refer to unit label diagram for to line-side
information. Field power wires will be connected line-side
pressure lugs on the power terminal block or at factory-
installed option non-fused disconnect.
Field power wires are connected to the unit at the leads to the
factory connection leads (pigtails) in the unit’s main control
box (see Fig. 8) or at factory-installed option non-fused
disconnect switch. Max wire size is #4 AWG (copper only).
NOTE: TEST LEADS - Unit may be equipped with short
leads (pigtails) on the field line connection points on the
optional disconnect switch. These leads are for factory
run-test purposes only; remove and discard before connect-
ing field power wires to unit connection points.
Fig. 7 — Disconnect Switch and Unit
Units Without Factory-Installed Disconnect —
When installing units, provide a disconnect switch per NEC
(National Electrical Code) of adequate size. Disconnect sizing
data is provided on the unit informative plate. Locate on unit
cabinet or within sight of the unit per national or local codes.
Do not cover unit informative plate if mounting the disconnect
on the unit cabinet.
Units with Factory-Installed Disconnect —
The factory-installed option disconnect switch is located in a
weatherproof enclosure located under the main 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. 8 for power wiring connections to
the unit power terminal block and equipment ground.
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.
Fig. 8 — Power Wiring Connections
All field wiring must comply with the NEC and local
requirements.
Affix the crankcase heater warning sticker to the unit
disconnect switch.
Convenience Outlets —
Two types of convenience outlets are offered on 38AUZ
models: Non-powered and unit-powered. Both types 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. 9.
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch
and condensing unit. Use only copper wire.
(See Fig. 7.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
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 opening unit for service. Locate its disconnect
switch, if appropriate, and open it. Tag-out this switch, if
necessary.
Ground Lug
Splice Terminals
(field supplied)
DISCONNECT
BLK
YEL
BLU
LEGEND
Factory Power Connection Lead
Field Power Supply Conductor