Caution, Warning – Carrier 50TC User Manual

Page 13

All Units —

All field wiring must comply with the NEC and local

requirements.

Size wire based on MCA (Minimum Circuit Amps) on the

unit informative plate. See Fig. 23 and the unit label

diagram for power wiring connections to the unit power

terminal blocks and equipment ground. Maximum wire

size is 2/0 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.

Voltage to compressor terminals during operation must be

within voltage range indicated on unit nameplate. See

Table 9. 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 9 (see Note 2

on page 46) to determine the percent of voltage

imbalance.

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

-in. female spade connector from the 230--v

connection and moving it to the 200-v

-in. male

terminal on the primary side of the transformer. Refer to

unit label diagram for additional information.

UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment

damage.
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.

CAUTION

NOTE: Check all factory and field electrical connections
for tightness.
Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch of

adequate size per NEC (National Electrical Code).

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. Discard the

factory test leads (see Fig. 23). The factory disconnect is

an 80A disconnect.

Units Without Disconnect Option

Units With Disconnect Option

Optional

Disconnect

Switch

Disconnect factory test leads; discard.

Factory

Wiring

TB1

208/230-3-60

460-3-60
575-3-60

Disconnect

per

NEC

C10015

Fig. 23 -- Power Wiring Connections

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.

Lock--out and tag--out this switch, if necessary.

WARNING

Two types of convenience outlets are offered on the

50TC--D16 : 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 panel beneath the control box.

See Fig. 24.

50TC

*16