Factory-Option Thru-Base Connections; Field Control Wiring; Unit Without Thru-Base Connection Kit - Carrier WeatherExpert 50LC 07 Series Installation Instructions Manual

from the factory. See unit nameplates for the proper fuse,
HACR or maximum over-current protection device required on
the unit with field-installed accessories.
Fig. 32 — HACR Caution Label

FACTORY-OPTION THRU-BASE CONNECTIONS

This service connection kit consists of two
bulkhead connectors and a
tor, all factory-installed in the embossed (raised) section of the
unit basepan in the condenser section. The
connector enables the low-voltage control wires to pass
through the basepan. The 1
allows the high-voltage power wires to pass through the base-
pan. See Fig. 33.
Fig. 33 — Thru-Base Connection Fittings
Check tightness of connector lock nuts before connecting elec-
trical conduits.
Field-supplied and field-installed liquid tight conduit connec-
tors and conduit may be attached to the connectors on the base-
pan. Pull correctly rated high voltage and low voltage through
appropriate conduits. Connect the power conduit to the internal
disconnect (if unit is so equipped) or to the external disconnect
(through unit side panel). A hole must be field cut in the main
control box bottom on the left side so the 24-v control connec-
tions can be made. Connect the control power conduit to the
unit control box at this hole.
UNITS WITHOUT THRU-BASE CONNECTIONS
1. Install power wiring conduit through side panel openings.
Install conduit between disconnect and control box.
2. Install power lines to terminal connections as shown in
Fig. 18.

FIELD CONTROL WIRING

The 50LC unit requires an external temperature control device
such as a thermostat (field-supplied).
1 / -in. electrical
2
3 / -in. electrical bulkhead connec-
4
3 / -in. bulkhead
4
/ -in. electrical bulkhead connector
2
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
THERMOSTAT
Install a Carrier-approved accessory thermostat according to
installation instructions included with the accessory. For com-
plete economizer function and 3 stage compressor operation
select a three-stage cooling thermostat. If a 3-stage cooling
thermostat is not available, use a 2-stage cooling thermostat in-
stead, but note that this will limit cooling to just 2 stages. When
electric heat is installed in the 50LC unit, the thermostat must
be capable of energizing the G terminal (to energize the Indoor
Fan Contactor) whenever there is a space call for heat (energiz-
ing the W1 terminal). The accessory thermostats listed on the
unit price pages can provide this signal but they are not config-
ured to enable this signal as shipped.
Locate the thermostat accessory on a solid wall in the condi-
tioned space to sense average temperature in accordance with
the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v power,
use a thermostat cable or equivalent single leads of different col-
ors with minimum of eight leads. If the thermostat does not re-
quire a 24-v source (no "C" connection required), use a thermo-
stat cable or equivalent with minimum of seven leads. Check the
thermostat installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (American
Wire Gage) insulated wire (35°C minimum). For 50 to 75 ft
(15 to 23 m), use no. 16 AWG insulated wire (35°C minimum).
For over 75 ft (23 m), use no. 14 AWG insulated wire (35°C
minimum). All wire sizes larger than no. 18 AWG cannot be
directly connected to the thermostat and will require a junction
box and splice at the thermostat.
Typical
Thermostat
Connections
C
W1
W2
G
Y3
(Note 3 & 4)
O/B/Y2
(Notes 2, 3 & 4)
(Note 1)
Y1
R
Note 1: Typical multi-function marking. Follow manufacturer's configuration
Instructions to select Y2.
Note 2: Y2 to Y3 connection required for 2-stage cooling operation and when
integrated economizer function is desired.
Note 3: To Connect a 2-Stage Thermostat:
Y2 to Y3 connection required for 2-stage cooling operation which
provides low and high cooling states.
Note 4: SystemVu controller is default configured for 3-stage cooling and
2-stage heating thermostats; it can be configured for other thermostat types.
Field Wiring
Fig. 34 — Low-Voltage Connections

UNIT WITHOUT THRU-BASE CONNECTION KIT

Pass the thermostat control wires through the hole provided in
the corner post; then feed the wires through the raceway built
into the corner post to the control box. Pull the wires over to
the terminal strip on the upper-left corner of the Controls Con-
nection Board. See Fig. 35.
22
Integrated Staging Control
(ISC) Board or
SystemVu TM Controller
C
W1
T
H
W2
E
R
G
M
O
Y3
S
T
Y2
A
T
Y1
R