8
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. 6) as described in Steps 1 through 3 below.
NOTE: For wire runs, use the following insulated wire:
LEGEND
AWG — American Wire Gage
All wire larger than no. 18 AWG cannot be directly con-
nected to the thermostat and will require a junction box and
splice at the thermostat.
1. Connect thermostat wires to screw terminals of low-
voltage connection board.
2. Pass the control wires through the hole provided in the
corner post. (See Fig. 7.)
3. Feed wire through the raceway built into the corner post
and into the 24 v thermostat connection board. The 24 v
thermostat connection is located on the left side of the
low-voltage connection compartment. The raceway pro-
vides the UL required clearance between high- and low-
voltage wiring.
Total combined amperage drain of the field-installed liquid
line solenoid valve and indoor (evaporator) fan contactor must
not exceed 22 va. If the specified va must be exceeded, use a
remote relay to switch the load.
LENGTH INSULATION
RATING (C)
SIZE
Ft M AWG sq mm
0-50 0-15.2 35 18 0.82
50-75 15.2-22.9 35 16 1.30
Over 75 Over 22.9 35 14 2.08
24-V BARRIER
LOW-VOLTAGE
THERMOSTAT
CONNECTION
BOARD
RACEWAY
CORNER
POST
Fig. 7 — Field Control Wiring Raceway
(38AKS Unit Shown)
Fig. 6 — Typical Control Wiring Connections/Component Arrangement (38AK Shown)
LEGEND
AHA — Adjustable Heat Anticipator
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Compensator
CLO — Compressor Lockout
COMP — Compressor Motor
HPS — High-Pressure Switch
IFC — Indoor (Evaporator) Fan Contactor
LLSV — Liquid Line Solenoid Valve
LPS — Low-Pressure Switch
NEC — National Electrical Code
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor
QT — Quadruple Terminal
TB — Termi na l B l oc k
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Term in a l B lo ck
Splice
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common
potential only.
Not to represent wiring.
Ground