Carrier 38AUZ User Manual download pdf (Page 10)

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

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Carrier 38AUZ User Manual Page 10

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