Carrier 38AQS012 Installation, Start-Up And Service Instructions Manual page 11

IMPORTANT: The common (COM) terminals from all
three fan coil relay boards must be connected to the 'P'
terminal in condensing unit 'A'.
Route thermostat cable or equivalent single leads of no. 18
AWG (American wire Gage) colored wire from subbase termi-
nals through conduit in unit to low-voltage connections as
shown on unit wiring diagram and Fig. 10A-10C.
NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated
wire (35 C minimum). For 51 to 75 ft, use no. 16 AWG insu-
lated 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 a splice at the thermostat.
38AQS
Model
Name-
plate
501 208-230
012 601 460
101 575
501 208-230
016 601 460
101 575
38AQS
Model
Name-
plate
800 230
012
900 400
800 230
016
900 400
LEGEND
— Full Load Amps (fan motors)
FLA
ICF — Maximum Instantaneous Current Flow during start-up
(LRA of compressor plus total FLA of fan motors)
LRA — Locked Rotor Amps
— Minimum Circuit Amps per NEC Section 430-24
MCA
MOCP — Maximum Overcurrent Protection (fuse only)
RLA — Rated Load Amps (compressor)
THERMOSTAT NO.
SUBBASE NO.
Type
Display — °F or °C
CCN Compatible
2 Cooling Stages
2 Heating Stages
Auto Changeover
Fan Switch
Timeclock
Emergency Heat
LEGEND
CCN — Carrier Comfort Network
*Thermostat kit includes Temp System relay pack.
†Subbase has ON-AUTO fan switch.
Table 7A — Electrical Data (3 Ph/60 Hz)
UNIT
Volts
Supplied* MCA
Min Max
187 253 62.5
414 528 29.1
518 660 22.8
187 253 87.5
414 528 40.7
518 660 33.0
Table 7B — Electrical Data (3 Ph/50 Hz)
UNIT
Volts
Supplied* MCA
Min Max
198 264 47.5
342 457 31.4
198 264 66.9
342 457 43.0
Table 8 — Recommended Thermostats
33CSTKT-01*
—
Communicating, Programmable
X
X
X
X
X
X
X
ELECTRIC RESISTANCE CRANKCASE HEATER — The
crankcase heater is inserted into the compressor crankcase. The
crankcase heater is operated from the normally closed contacts
of the control relay (CR1) and is automatically energized when
compressor stops. This heater keeps crankcase warm to pre-
vent oil dilution by refrigerant, ensures good lubrication, and
minimizes loss of oil during start-up.
AIRFLOW SWITCH — Carrier recommends an indoor air-
flow switch (field supplied) be installed and interlocked with
the outdoor unit. This prevents the outdoor unit from operating
if indoor airflow fails (broken fan belt, etc.). Operation of the
compressor in vacuum can damage bearing surfaces. Install
indoor airflow switch in a convenient location at the indoor
supply air duct and wire per Fig. 11.
COMPRESSOR
MOCP
ICF (Amps) RLA
Fuse Only
178 100 43.6
81 40 20.0
65 35 15.7
274 125 63.6
124 60 29.3
100 50 23.8
COMPRESSOR
MOCP
ICF (Amps) RLA
Fuse Only
134.4 75 32.9
80.4 50 20.0
206.4 100 47.9
121.4 60 29.3
*Units are suitable for use on electrical systems where voltage sup-
plied to the unit terminals is not below or above the listed limits.
NOTES:
1. MCA and MOCP values are calculated in accordance with NEC
(National Electric Code) (U.S.A. Standard), Article 440.
2. Motor RLA and FLA values are established in accordance
with UL (Underwriters' Laboratories) Standard 1995 (U.S.A.
Standard).
33CSTK--01* HH07AT172 (°F)
— HH93AZ177†
X
X
X
X
X
X
11
FAN MOTORS (Single-Phase)
FLA (ea)
Total
Fan No.
LRA
Fans
1
170 4.3
77 2 2.3
62 1.8
266 4.3
120 2 2.3
96 1.8
FAN MOTORS (Single-Phase)
FLA (ea)
Total
Fan No.
LRA
Fans
1
128 3.5
2
74 3.5
200 3.5
2
115 3.5
HH07AT162 (°C)
HH93AZ177†
Standard
X X
X X
X X
X† X†
X X
2
3.7
1.9
1.8
3.7
1.9
1.8
2
2.9
2.9
2.9
2.9