Carrier 48LC - Units Without Thru- - Base Connections; Field Control Wiring; Thermostat; Unit Without Thru- - Base Connection Kit

25
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. 27.
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 installation 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. Locate the thermostat accessory
on a solid wall in the conditioned 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 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 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(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.
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 Connection Board. See Fig. 39.
NOTE: If thru--the--bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second--stage heating, when available.
C
G
C
G
O/B/Y2
Y2
R
R
Y1
Y1
Y3
Y3
(Note 1)
(Notes 2 & 3)
(Note 3)
W1
W1
W2
W2
T
H
E
R
M
O
S
T
A
T
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.
Field Wiring
Integrated
Staging Control
(ISC) Board
Typical
Thermostat
Connections
C13326
Fig. 38 -- Low--Voltage Connections
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 39 -- Field Control Wiring Raceway
RTU Open (Factory Option)
For details on operating 48LC*007 units equipped with the
factory installed RTU Open option refer to 48/50LC 07--26
Factory Installed Option RTU Open Multi--Protocol
Controller Controls, Start--up, Operation and
Troubleshooting (Catalog No. 48--50LC--7--26--1T, or later).
48HC48LC