Standard Connection; Control Voltage Connections; Transformer Protection; Heat Anticipator Setting - Carrier Performance 48VL-A Installation Instructions Manual

2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor (if equipped).
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 23 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 (if equipped).
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L3 to yellow wire on connection 13 of
the compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
Special Procedures for 208- - v Operation
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Make sure the power supply to the unit is switched OFF and
install lockout tag. before making any wiring changes. With
disconnect switch open, move black wire from transformer
(3/16 in. [4.8 mm]) terminal marked 230 to terminal marked
208. This retaps transformer to primary voltage of 208 vac.
WARNING
!
ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury or death and property damage.
Before making 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.

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. If the thermostat is located
more than 100 ft (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color- -coded, insulated
(35_C minimum) wires.

Standard Connection

Run the low- -voltage leads from the thermostat, through the inlet
hole, and into unit low- -voltage splice box.
Locate six (seven for 3- -phase) 18- -gage wires leaving control box.
These low- -voltage connection leads can be identified by the colors
red, green, yellow, brown, blue, and white (See Fig. 10). A gray
wire is standard on 3- -phase units for connection to an economizer.
Ensure the leads are long enough to be routed into the low- -voltage
splice box (located below right side of control box). Route leads
through hole in bottom of control box and make low- -voltage
connections (See Fig. 10). Secure all cut wires, so that they do not
interfere with operation of unit.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
EQUIP GR
LEADS
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
Fig. 10 - - High- - and Control- -Voltage Connections
Heat Anticipator Setting (Electro- - Mechanical
Thermostats only)
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the W and R terminals to determine the exact
required setting.
NOTE: For thermostat selection purposes, use 0.18 amp for the
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discomfort
to the occupants of the conditioned space, and inefficient energy
utilization; however, the required setting may be changed slightly
to provide a greater degree of comfort for a particular installation.

Transformer Protection

The transformer is of the energy- -limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blown fuse on
Indoor Fan board or Integrated Gas Controller. Replace fuse as
required with correct size and rating.
12
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
WHT(W1)
W
YEL(Y)
Y
GRN(G)
G
THERMOSTAT
RED(R)
(TYPICAL)
R
BRN(C)
C
BLU(DH)
DH
GRA(Y2)
3-Phase
Only
A09053