11
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation
instructions included with the accessory. Locate thermostat
assembly on a solid wall in the conditioned space to sense aver-
age temperature in accordance with thermostat installation
instructions.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals to low-voltage connections on
unit (shown in Fig. 9A or 9B) as described in Steps 1 through 4
below.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice at the
thermostat.
1. If mounted on a roof curb and electrical power is to be
run through the basepan, an accessory thru-the-bottom
connection kit is required. This is available through the
local Carrier distributor. This kit is required to ensure a
reliable water-tight connection.
2. If unit is mounted on roof curb and accessory thru-the-
bottom service connections are used, route wire through
connections.
3. Pass control wires through the hole provided on unit (see
connection D in Connection Sizes table in Fig. 7).
4. Feed wire through the raceway built into the corner post
to the 24-v barrier located on the left side of the control
box. See Fig. 10. The raceway provides the UL required
clearance between the high-voltage and low-voltage
wiring.
5. Connect thermostat wires to screw terminals of low-
voltage connector (see Fig. 9A or 9B).
NOTE: If thru-the-bottom power connections are used refer to
the accessory installation instructions for information on power
wiring. Refer to Fig. 7 for drilling holes in basepan.
HEAT ANTICIPATOR SETTINGS — For units with electric
heat, set heat anticipator settings as shown in Table 4.
W2
C
Y1
G
R
Y2
W1
C
G
R
Y2
W1
X
W2
C
Y1
G
R
Y2
W1
X
24 VAC
RMTOCC
CMPSAFE
FSD
NOT USED
C
X
SFS
THERMOSTAT CONTROL
CONNECTION
BOARD
BOARD
CONNECTION
CONTROL
Fig. 9B — Low Voltage Connections
(Units with PremierLink™ Controls)
CONNECTION
BOARD
FACTORY-
INSTALLED
DISCONNECT
(OPTION)
RACEWAY
COMPRESSOR
NO. 2
COMPRESSOR
NO. 1
CONVENIENCE
OUTLET
(OPTION)
HOLE IN
END
PANEL
Fig. 10 — Field Control Wiring Raceway
WIRE
CONNECTIONS
TO
LOW-VOLTAGE
SECTION
(CONNECTION
BOARD)
COOL STAGE 1
FAN
HEAT STAGE 1
COOL STAGE 2
HEAT STAGE 2
24 VAC HOT
24 VAC COM
N/A
OUTDOOR AIR
SENSOR
Y1/W2
G
W/W1
Y/Y2
O/W2
R
C
S1
S2
THERMOSTAT DIPSWITCH SETTINGS
R
G
Y1
Y2
W1
W2
C
IPD/X
ON
OFF
A
B
C
D
LEGEND
NOTE: Underlined letter indicates active thermostat output when
configured for A/C operation.
Fig. 9A — Low-Voltage Connections
(Standard Controls)
Field Wiring
To Next Page
Loading...
