Carrier 48SD - Install Electrical Connections; High- -Voltage Connections; Special Procedures for 208- -V Operation; Control Voltage Connections

11
Step 10—Install Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment,or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
!
WARNING
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFP A (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical
connections 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 unitis within operating
voltage range indicated on unit rating plate. On 3 --phase
units, ensure phases are balanced within 2 percent.Consult
local power company for correction of improper voltage
and/or phase imbalance.
4. Insulate low--voltage wires for highest voltage contained
withinconduitwhen low--voltagecontrol wiresare in same
conduit as high-- voltage wires.
5. Do not damageinternal componentswhen drilling through
any panel to mount electrical hardware, conduit, etc.
!
CAUTION
HIGH--VOLTAGE CONNECTIONS
When routing power leads into unit, use only copper wire between
disconnect and unit. The high voltage leads should be in a conduit
until they enter the duct panel; conduit termination at the duct panel
must be watertight.
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, NEC and local
codes for maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing.
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. 3 and 4 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 lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire connected to 11 terminal of
the compressor contactor.
5. Connect field wire L2 to yellow wire connected to 23
terminal of the compressor contactor.
Three--phase units:
1. Run the high-- voltage (L1, L2, L3) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor, and blue wire from compressor.
4. Connect field L1 to black wire on connected to 11 terminal
of the compressor contactor.
5. Connect field wire L3 to yellow wire connected to 13
terminal of the compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
SPECIAL PROCEDURES FOR 208 --V OPERATION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Beforemaking any wiring changes, make sure the gas supply
is switched off first. Then switch off the power supply to the
unit and install lockout tag.
!
WARNING
CONTROL VOLTAGE CONNECTIONS
Do not use any type of power--stealing thermostat. Unit control
problems may result.
Use no. 18 American Wire Gage (AWG) color--coded, insulated
(35_C minimum) wires to make the control voltage connections
between the thermostat and the unit. Ifthe thermostat is located more
than 100 ft from the unit (as measured along the control voltage
wires), use no. 16 AWG color-- coded, insulated (35_C minimum)
wires.
Standard
Connection
Remove knockout hole located in the flue panel adjacent to the
control access panel (See Fig. 3 and 4). Remove the rubbergrommet
from the installer’s packet (included with unit) and install grommet
in the knockout opening. Provide a drip loop before running wire
through panel.
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GR
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)
THERMOSTA
T
(TYPICAL)
A05144
Fig. 11 -- High-- and Control--Voltage Connections
48SD