Special Procedures For 208-V Operation; Control Voltage Connections; Standard Connection; Transformer Protection - Carrier Performance 50VG-K Installation Instructions Manual

50VG-K: Installation Instructions
Fig. 10 – High- and Control-Voltage Connections
5. Connect field wire L2 to yellow wire from 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.
4. Connect field L1 to black wire from connection 11 of the
compressor contactor.
5. Connect field wire L3 to yellow wire from 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.
Before installing or servicing system, always turn off main power to
system and install lockout tag. 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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Control Voltage Connections

NOTE: 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

Locate the eight low voltage thermostat leads (seven for 460 VAC
models) in 24 volt splice box. See
the low-voltage leads from the thermostat, through the control wiring
inlet hole grommet
box. Provide a drip loop before running wires through panel. Secure and
strain relief all wires so that they do not interfere with operation of unit.
If an accessory electric heater is installed, low voltage leads from heater
must be connected to factory supplied control leads from Indoor Fan
Board P4 connector.
IMPORTANT: Dehumidification control must open control circuit on
humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of either a 24
A12565
VAC dehumidistat or a thermostat which includes control of a 24 VAC
dehumidistat connection. In either case, the dehumidification control
must open the control circuit on humidity rise above the
dehumidification set point.
NOTE: If the unit 24V wires do not have a matching receptacle, cut the
24V wires from the electric heater plug, strip the ends, and wire nut
together to match the schematic connections. If the electric heater 24V
wires do not have a matching plug, cut the 24V wires from the unit
receptacle, strip the ends, and wire nut together to match the schematic
connections.
Factory wires are provided for electric heat staging W1 and W2 (W2 and
W3 on IFB). If room thermostat has only one stage of supplemental heat,
connect white and violet wires shown in
field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.

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 blower fuse on Indoor Fan
Board. Replace fuse as required with correct size and rating.
11
Fig. 10 for connection diagram. Run
(Fig. 2 and Fig. 3), and into the low-voltage splice
Fig. 10 to second stage heat