18
Determine percent of voltage imbalance:
% Voltage Imbalance = 100 x
= 1.53%
This amount of phase imbalance is satisfactory as it is be-
low the maximum allowable 2%.
Unit operation on improper line voltage or excessive phase
imbalance may be considered abuse and any resulting damage
may not be covered by Carrier warranty.
All wiring must be in accordance with local or NEC
(National Electrical Code) regulations.
POWER WIRING — The units must have adequate overcur-
rent protection, fuses, or HACR (Heating, Air-Conditioning
and Refrigeration) breakers, according to the national and ap-
plicable local codes.
For field power connections, all main power wiring enters
the unit through a factory-punched access hole under the con-
trol box. Attach power wires to the power connections on the
main power terminal block in the unit control box. Be sure to
install a ground wire.
CONTROL WIRING — All units require an accessory ther-
mostat package to complete the unit control system. For a
room-mounted thermostat, the thermostat may be mounted in
an appropriate location in the conditioned space. Route the
wires from the thermostat to the low voltage connection of the
control box. Connect wires to the low voltage terminal block.
See Fig. 18. The fan switch on the thermostat will control fan
operations.
FREEZE PROTECTION THERMOSTAT — A standard
freeze protection thermostat is factory-installed.
Table 2 — Electrical Data
LEGEND
NOTES:
1. In compliance with NEC requirements for multimotor and com-
bination load equipment (NEC Articles 430 and 440), the over-
current protective device for the unit shall be fuse or HACR
circuit breaker. Canadian units may be fuse or circuit breaker.
2. Wire sizing amps are a sum of 125% of the compressor RLA
plus 100% of indoor fan motor FLA (full load amps).
3. Motors are protected against primary single phasing condition.
4. Indoor-fan motors are 3-phase motors of same voltage as unit.
IMPORTANT: If supply voltage phase imbalance is
more than 2%, contact your local electric utility com-
pany immediately.
7
457
UNIT
50XCW
V-PH-Hz
VOLTAGE
RANGE
COMPRESSOR
NO. 1
COMPRESSOR
NO. 2
Min
Max
RLA
LRA
RLA
LRA
06
208/230-3-60
187
253
18.3
136
—
—
460-3-60
414
506
8.8
66
—
—
575-3-60
518
632
6.6
55
—
—
08
208/230-3-60
187
253
23.0
149
—
—
460-3-60
414
506
11.0
75
—
—
575-3-60
518
632
8.0
54
—
—
12
208/230-3-60
187
253
15.6
110
15.9
110
460-3-60
414
506
7.8
52
7.1
52
575-3-60
518
632
5.8
39
5.1
39
14
208/230-3-60
187
253
19.6
136
19.2
136
460-3-60
414
506
8.2
66
8.7
66
575-3-60
518
632
6.6
55
6.9
55
16
208/230-3-60
187
253
28.7
191
23.0
149
460-3-60
414
506
13.3
100
11.0
75
575-3-60
518
632
10.0
78
8.0
54
24
208/230-3-60
187
253
40.7
240
28.7
191
460-3-60
414
506
19.3
140
13.3
100
575-3-60
518
632
15.6
107
10.0
78
LRA
—
Locked Rotor Amps
NEC
—
National Electrical Code
RLA
—
Rated Load Amps