Carrier 38AK012 User Manual

Page 8

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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
average temperature in accordance with thermostat instal-
lation instructions.

Route thermostat cable or equivalent single leads of

colored wire from subbase terminals to low-voltage connec-
tions on unit (shown in Fig. 6) as described in Steps 1 through
3 below.
NOTE: For wire runs, use the following insulated wire:

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

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 liq-

uid line solenoid valve and indoor (evaporator) fan con-
tactor must not exceed 22 va. If the specified va must be
exceeded, use a remote relay to switch the load.

LEGEND

AHA

Adjustable Heat Anticipator

C

Contactor, Compressor

CB

Circuit Breaker

CC

Cooling Compensator

CLO

Compressor Lockout

HPS

High-Pressure Switch

IFC

Indoor (Evaporator) Fan

Contactor

LLSV — Liquid Line Solenoid Valve
LPS

Low-Pressure Switch

TB

Terminal Block

TC

Thermostat-Cooling

TDR

Time-Delay Relay

TH

Thermostat-Heating

TRAN — Transformer

Terminal (Marked)

Splice

Factory Wiring
Field Control Wiring

To Indicate Common Potential
Only; Not to Represent Wiring

Fig. 6 — Typical Control Wiring Connections (38AK Shown)

24-V BARRIER

LOW-VOLTAGE
THERMOSTAT
CONNECTION
BOARD

RACEWAY

CORNER
POST

Fig. 7 — Field Control Wiring Raceway

(38AKS Unit Shown)

8

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