Carrier 48VL-E Installation Instructions Manual page 12

48VL-(E, F): Installation Instructions
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
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
that they do not interfere with operation of unit.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 10). A gray wire is standard on
Fig. 10). Secure all cut wires, so
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(W)
W
YEL(Y)
Y
GRN(G)
G
THERMOSTAT
RED(R) (TYPICAL)
R
BRN(C)
C
BLU(DH)
DH
GRA(Y2)
3-Phase
Only
A09053