Operating instructions
Step 10—INSTALL ELECTRICAL CONNECTIONS
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of serious injury
if an electrical fault should occur. This ground may consist of
an electrical wire connected to the unit ground lug in the
control compartment, or conduit approved for electrical
ground when installed in accordance with NEC (National
Electrical Code) ANSI/NFPA (latest edition) and local elec-
trical codes. In Canada, follow Canadian Electrical Code
CSA (Canadian Standards Association) C22.1 and local
electrical codes. Failure to adhere to this warning could result
in serious injury or death.
Failure to follow these precautions could result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connec-
tions must be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduit, etc. On
3-phase units, ensure phases are balanced within 2 percent.
Consult local power company for correction of improper
voltage and/or phase imbalance.
HIGH-VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a field-
supplied, waterproof, disconnect switch mounted at, or within
sight from, the unit. Refer to the unit rating plate for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for
wire sizing (See Tables 4 and 5 for electrical data).
The field-supplied disconnect switch box may be mounted on the
unit over the high-voltage inlet hole when the standard power and
low-voltage entry points are used (See Fig. 2 and 3 for acceptable
location).
See unit wiring label and Fig. 11 for reference when making high
voltage connections. Proceed as follows to complete the high-
voltage connections to the unit.
Single phase units:
1. Run the high-voltage (L1, L2) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Connect L1 to pressure lug connection 11 of the compressor
contactor.
4. Connect L2 to pressure lug connection 23 of the compressor
contactor.
Three-phase units:
1. Run the high-voltage (L1, L2, L3) and ground leads into the
control box.
Table 4—Electrical Data—Unit 48GS
UNIT
SIZE
48GS
V-PH-HZ
VOLTAGE
RANGE
COMPRESSOR
OUTDOOR FAN
MOTOR
INDOOR FAN
MOTOR
POWER SUPPLY
Min Max RLA LRA FLA FLA MCA
Max Fuse or
Ckt Bkr
018 208/230–1–60 187 253 9.0 45.0 0.8 1.8 13.9 20
024 208/230–1–60 187 253 12.8 61.0 0.8 2.0 18.8 30
030
208/230–1–60 187 253 14.4 73.0 0.8 2.0 20.8 30
208/230–3–60 187 253 12.6 68.0 0.8 2.0 13.2 20
036
208/230–1–60 187 253 13.0 81.0 1.6 3.6 24.0 35
208/230–3–60 187 253 9.0 78.0 1.6 3.6 16.5 25
460–3–60 414 506 4.5 40.0 0.9 1.9 8.4 15
042
208/230–1–60 187 253 18.6 105.0 1.6 3.8 27.5 45
208/230–3–60 187 253 10.7 85.0 1.6 3.8 18.8 25
460–3–60 414 506 5.3 42.0 0.9 2.0 9.5 15
048
208/230–1–60 197 253 25.3 131.0 1.6 3.8 37.0 60
208/230–3–60 187 253 13.5 108.0 1.6 3.8 22.3 35
460–3–60 414 506 6.7 47.5 0.9 2.0 11.3 15
060
208/230–1–60 187 253 28.9 147.0 1.6 6.2 43.9 60
208/230–3–60 187 253 18.6 125.0 1.6 6.2 31.1 45
460–3–60 414 506 8.5 66.5 0.9 3.2 14.7 20
Fig. 11—High- and Control-Voltage Connections
C99018
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GND
CONTROL BOX
SPLICE BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
W
Y
G
R
C
WHT(W1)
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL)
12