Carrier 38AUQ appendix Convenience Outlets, Fire Hazard, Units Without Factory-InstalledDisconnect

Field power wires are connected to the unit at line-side pres- sure lugs on compressor contactor C and TB1 (see wiring dia- gram label for control box component arrangement) or at facto- ry-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 con- tactor C or optional disconnect switch. These leads are for factory run-test purposes only; remove and discard before connecting field power wires to unit connection points. Make field power connections directly to line connection pressure lugs only.

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. 8.)

ELECTRIC

DISCONNECT

SWITCH

COPPER

WIRE ONLY

ALUMINUM

WIRE

Fig. 8 — 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. 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

11 13

Disconnect

per

NEC

L1 L2 L3

208/230-3-60

460-3-60

575-3-60

Units With Disconnect Option

L1	2		1
		Optional		Factory
L2	4	Disconnect	3
				Wiring
		Switch
L3	6		5

Disconnect factory test leads; discard.

Fig. 9 — Power Wiring Connections

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 10. 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 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 opening 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 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.

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