Units Without Thru-Base Connections; Field Control Wiring; Thermostat; Unit Without Thru-Base Connection Kit - Carrier WeatherMaster 48HC14 Installation Instructions Manual

CONNECTOR
PLATE
ASSEMBLY
GASKET
Fig. 45 — Completing Installation of Thru-the-Base
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. 34.

FIELD CONTROL WIRING

The 48HC**14 unit requires an external temperature control
device. This device can be a thermostat (field-supplied) or a
PremierLink™ controller (available as factory-installed option
or as field-installed accessory, for use on a Carrier Comfort
Network ® or as a standalone control) or the RTU Open Con-
troller for Building Management Systems using non-CCN pro-
tocols (RTU Open controller is available as a factory-installed
option only).

THERMOSTAT

Install a Carrier-approved accessory 2-stage cooling/heating
thermostat according to installation instructions included with
the accessory. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in accor-
dance 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 seven leads. If the thermostat does not
require a 24-v source (no "C" connection required), use a ther-
mostat cable or equivalent with minimum of six 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 insu-
lated 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.
Option
Typical
Thermostat
Connections
C
G
W2
(Note 2)
W1
O/B/Y2
(Note 1)
Y1
R
Note 1: Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
Fig. 46 — Typical Low-Voltage Control Connections

UNIT WITHOUT THRU-BASE CONNECTION KIT

Pass the thermostat control wires through the bushing on the
unit end panel. Route the wire through the snap-in wire tie and
up to the web bushing near the control box. Route the wire
through the bushing and into the bottom left side of the control
box after removing one of the two knockouts in the corner of
the box. Using a connector at the control box to protect the
wire as it passes into the control box. Pull the wires over to the
terminal strip at the upper left corner of the Central Terminal
Board (CTB). Use the connector at the control box and the
wire tie to take up any slack in the thermostat wire to ensure
that it will not be damaged by contact with the condenser coil.
See Fig. 47.
NOTE: If thru-the-bottom connections accessory is used, refer to
the accessory installation instructions for information on routing
power and control wiring.
Fig. 47 — Thermostat Wire Routing

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.

Wiring Diagrams

See Fig. 48-50 for wiring diagrams.
24
Central
Terminal
Board
X
C
T
H
G
E
R
W2
M
O
W1
S
T
Y2
A
T
Y1
R
Thermostat Wire