Unit Without Thru- - Base Connection Kit; Heat Anticipator Settings; Electric Heaters - Carrier WeatherExpert 50LC Installation Instructions Manual

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. 32 - - 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 Connection Board. See Fig. 33.
NOTE: If thru- - the- - bottom connections accessory is used,
refer to the accessory installation instructions for
information on routing power and control wiring.
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 33 - - Field Control Wiring Raceway
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.
Integrated Staging Control
(ISC) Board or
SystemVu Controller
TM
C
W1
T
H
W2
E
R
G
M
O
Y3
S
T
Y2
A
T
Y1
R
a48--- 9346
C08027

Electric Heaters

50LC units may be
field- - installed electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, line- - break limit
switches and a control contactor. One or two heater
modules may be used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 34, Fig. 35 and Fig. 36.
Not all available heater modules may be used in every
unit. Use only those heater modules that are UL/ETL
listed for use in a specific size unit. Refer to the label on
the unit cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).
DISCONNECT MOUNTIN G
LOCATIO N
UNI BLOCK-OFF T
P ANEL
Fig. 34 - - Access Panel Locations
DISCONNECT EMT OR RIGID CONDUIT
MOUNTING (FIELD-SUPPLIED)
LOCATION
SINGLE POINT
MAIN BRACKET AND BOX
CONTROL CONDUIT MOUNTING
BOX DRIP BOOT SCREW
CONTROL WIRE TERMINAL BLOCK
Fig. 35 - - Component Locations
23
equipped with factory
INDOOR
OUTDOOR
ACCESS
ACCESS PANEL
PANEL
C13204
SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER
COVERS
HEATER HEATER HEATER
MODULE MODULE MOUNTING
(LOCATION 1) (LOCATION 2) BRACKET
C13205
or