Carrier WeatherExpert 48LC Series Service And Maintenance Instructions page 34

Fig. 42 — HACR Caution Label
FACTORY-OPTION THRU-BASE CONNECTIONS
This service connection kit consists of two
head connectors and a / -in. electrical bulkhead connector, all
3
4
factory-installed in the embossed (raised) section of the unit
basepan in the condenser section. The
enables the low-voltage control wires to pass through the base-
pan. The / -in. electrical bulkhead connector allows the high-
1
2
voltage power wires to pass through the basepan. See Fig. 43.
Fig. 43 — Thru-Base Connection Fittings
Check tightness of connector lock nuts before connecting electri-
cal conduits.
Field-supplied and field-installed liquid tight conduit connectors
and conduit may be attached to the connectors on the basepan.
Pull correctly rated high voltage and low voltage through appro-
priate conduits. Connect the power conduit to the internal discon-
nect (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 connections 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. 44.
/ -in. electrical bulk-
1
2
/ -in. bulkhead connector
3
4
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
Units Without Disconnect or HACR Option
C
13
L1
Units With Disconnect or HACR Option
L1 2
4
L2
3 Phase Only
L3 6
Ground
(GR)
Fig. 44 — Power Wiring Connections
FIELD CONTROL WIRING
The 48LC unit requires an external temperature control device
such as a thermostat (field-supplied).
THERMOSTAT
Install a Carrier-approved accessory thermostat according to in-
stallation instructions included with the accessory. For complete
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 instead, but note
that this will limit cooling to just 2 stages. When electric heat is in-
stalled in the 48LC unit, the thermostat must be capable of ener-
gizing the G terminal (to energize the Indoor Fan Contactor)
whenever there is a space call for heat (energizing the W1 termi-
nal). The accessory thermostats listed on the unit price pages can
provide this signal but they are not configured to enable this signal
as shipped.
Locate the thermostat accessory on a solid wall in the conditioned
space to sense average temperature in accordance with the ther-
mostat installation instructions.
If the thermostat contains a logic circuit requiring 24-v power, use
a thermostat cable or equivalent single leads of different colors
with minimum of eight leads. If the thermostat does not require a
24-v source (no "C" connection required), use a thermostat cable
or equivalent with minimum of seven leads. Check the thermostat
installation instructions for additional features which might re-
quire 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 [95°F] minimum). For 50 to
75 ft. (15 to 23 m), use no. 16 AWG insulated wire (35°C [95°F]
minimum). For over 75 ft. (23 m), use no. 14 AWG insulated wire
(35°C [95°F] 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. See Fig. 45.
34
Equip
GR Lug
IFTB
Disconnect
per
NEC
L2 L3 Ground
(GR)
208/230-3-60
460-3-60
575-3-60
1
Optional
Disconnect
3
Switch 3 Phase Only
5
Equip GR Lug
Factory
Wiring