Carrier start-up and Installationshandbuch PDF herunterladen (Seite 13)

11 13

L2 L3

CTB1

208/230-3-60

460-3-60

575-3-60

Units Without Disconnect Option

Units With Disconnect Option

Optional

Disconnect

Switch

Disconnect factory test leads; discard.

Factory

Wiring

Disconnect

per

NEC

C10204

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 7. 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 7, 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 opining unit for service. Locate its

disconnect switch, if appropriate, and open it. Tag--out

this switch, if necessary.

WARNING

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.

Control Box

Access Panel

Pwd-CO

Transformer

Convenience

Outlet

GFCI

Pwd-CO

Fuse

Switch

C10205

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 115-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

transformer primary leads can be connected at the

line-side terminals on the unit-mounted non-fused

disconnect or HACR breaker switch; this will provide

service power to the unit when the unit disconnect switch

or HACR switch is open. Other connection methods will

result in the convenience outlet circuit being de-energized

when the unit disconnect or HACR switch is open. See

Fig. 11.

Duty Cycle: The unit-powered convenience outlet has a

duty cycle limitation. The transformer is intended to

provide power on an intermittent basis for service tools,

lamps, etc; it is not intended to provide 15-amps loading

for continuous duty loads (such as electric heaters for

overnight use). Observe a 50% limit on circuit loading

above 8-amps (i.e., limit loads exceeding 8-amps to 30

minutes of operation every hour).

Test the GFCI receptacle by pressing the TEST button on

the face of the receptacle to trip and open the receptacle.

Check for proper grounding wires and power line phasing

if the GFCI receptacle does not trip as required. Press the

RESET button to clear the tripped condition.

Fuse on power type: The factory fuse is a Bussman

“Fusetron” T-15, non-renewable screw-in (Edison base)

type plug fuse.

38AUQ

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 47 48

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