34
Fig. 42 — HACR Caution Label
FACTORY-OPTION THRU-BASE CONNECTIONS
This service connection kit consists of two
1
/
2
-in. electrical bulk-
head connectors and a
3
/
4
-in. electrical bulkhead connector, all
factory-installed in the embossed (raised) section of the unit
basepan in the condenser section. The
3
/
4
-in. bulkhead connector
enables the low-voltage control wires to pass through the base-
pan. The
1
/
2
-in. electrical bulkhead connector allows the high-
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.
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.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
Disconnect
per
NEC
13
L1 L2 L3
IFTB
C
208/230-3-60
460-3-60
575-3-60
Units Without Disconnect or HACR Option
Units With Disconnect or HACR Option
L1
L2
L3
2
4
6
1
5
Optional
Disconnect
Switch
Factory
Wiring
3
Ground
(GR)
Equip
GR Lug
Equip GR Lug
Ground
(GR)
3 Phase Only 3 Phase Only
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