The 38AYC Split-System Heat Pumps
are designed for quiet, reliable heating
and cooling. With SEER ratings from
11.0 to 12.5 and HSPF ratings from 7.0
to 8.3, these heat pump systems provide
efficient operation. These units provide
heat during the winter months by
transferring heat from the outdoors.
They then reverse this process during
the summer months to reliably provide
cooling and dehumidification. All
models are listed with UL, (U.S. and
Canada), CEC and ARI.
AVAILABLE OPTIONS
Electrical Range — All units are
offered in single phase 208–230v.
Size Range — 38AYC is available in 7
nominal sizes from 018 through 060 to
meet the needs of residential and light
commercial applications.
Compressor — This unit features a
scroll compressor which is
significantly more efficient than
conventional compressors. Its simple
design offers improved reliability.
Each compressor is mounted on rubber
isolators for additional sound
reduction. For improved serviceability,
all models are equipped with a
compressor terminal plug. Continuous
operation is approved down to –30°F
(–34.4°C) in the heating mode and
down to 55°F (12.8°C) in the cooling
mode. (See heating and cooling
performance tables.)
Built-in-Reliable Components —
Includes a suction-tube accumulator
that reduces the amount of liquid
refrigerant that reaches the compressor,
a loss of charge switch, and an internal
pressure relief valve (except 018–024
sizes) for high-pressure protection.
Copyright 2004 Carrier CorporationForm 38AYC-5PD
Page 2
Defrost Control Board —
Incorporates a defrost relay, defrost
unit with a hard, smooth finish that will
last for many years.
timer, and low-voltage terminations.
The defrost control is a time/
temperature initiation/termination
control which includes 3 fieldselectable time periods of 30, 50, and
90 minutes.
Discharge Muffler — Incorporated to
minimize low frequency sound and
pressure pulsation generated by
compressor discharge gas.
Cabinet Protection — Steel is
protected with a galvanized coating
and treated with a layer of zinc
phosphate. A coat of modified
polyester powder coating is then
applied and baked on, providing each
All screws on cabinet exterior are
coated for a long-lasting, rust-resistant,
quality appearance.
Unit Design — All units are equipped
with totally enclosed fan motors for
greater reliability under rain and snow
conditions. The large, wraparound coil
uses copper tube and enhanced
aluminum fin and is designed for
optimum heat transfer during heating
and cooling. The vertical air discharge
carries the sound and air up and away
from adjacent patio areas and foliage.
The condenser coil can be cleaned with
a common garden hose.
Model number nomenclature
38AYC018
301
Stabilizer Top — Outlet grille
incorporates stabilizing technology that
provides smooth, sturdy operation.
External Service Valves — Both
service valves are brass, front seating
type. The 38AYC has sweat field
connections. Valves are externally
located so refrigerant tube connections
can be made quickly and easily. Each
valve has a service port for ease of
checking operating refrigerant pressures.
Limited Warranty — Standard
5-year limited warranty on parts, and a
5-year limited warranty on the
compressor.
Air Discharge
Air Qty (CFM)
Motor HP
Motor RPM (60 Hz)
CONDENSER COIL
Face Area (Sq Ft)
Fins per In.
Rows
Circuits
VALVE CONNECTION (In. ID)
Vapor
Liquid
REFRIGERANT TUBES *
(In. OD)
Vapor
Liquid
Tube sizes are for runs up to 50 ft. For tube set over 50 ft horizontal or 20 ft vertical differential, consult Residential Split Systems Long-Line Appli-
cation Guideline.
NOTE: See unit Installation Instructions for proper installation.
115166188208209250278
Scroll
R-22
5.55.637.889.8810.6311.1314.0
Propeller Type, Direct Drive
Thermidistat™ Control — Programmable Thermostat with Humidity Control
Thermostat — Auto Changeover, 7-Day Programmable, °F/°C, Dual Fuel
Must be used with Outdoor Sensor (TSTATXXSEN01-B). High-pressure switch must be added
if not supplied with the system.
For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential, refer to Residential Split Systems Long-Line Application Guideline.
APPLICATIONS
(Below 55°F)
Ye sYesNo
Ye sN oN o
NoNoNo
Ye sYesNo
Ye sN oN o
See Low-Ambient InstructionsNoNo
NoNoYes
REQUIRED FOR
LONG-LINE
APPLICATIONS
(Over 50 Ft)
See Long-Line
Application
GuidelineNo
REQUIRED FOR
SEA COAST
APPLICATIONS
(Within 2 Miles)
Accessory description and usage (Listed alphabetically)
Ball-Bearing Fan Motor
A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.
Usage Guideline:
Coastal Filter
A mesh screen inserted under the top cover and inside the base pan to protect the condenser coil from salt damage without restricting airflow.
Compressor Start Assist – Capacitor and Relay
Start capacitor and relay gives a "hard" boost to compressor motor at each start up.
Usage Guideline:
4. Compressor Start Assist – PTC Type
Solid-state electrical device which gives a "soft" boost to the compressor motor at each start up.
Usage Guideline:
Crankcase Heater
An electric resistance heater which mounts to the base of the compressor to keep the lubricant warm during off cycles. Improves compressor lubrication on
restart and minimizes the chance of liquid slugging.
Note:
Some heat pumps are factory supplied with a crankcase heater. See accessory list for units that come standard with a crankcase heater. For units that do
not, use the guideline below.
Usage Guideline:
6. Evaporator Freeze Thermostat
An SPST temperature-actuated switch that stops unit operation when evaporator reaches freeze-up conditions.
Usage Guideline:
Filter Drier
A device for removing contaminants from refrigerant circulating in a heat pump system: two-direction flow.
Usage Guideline:
High-Pressure Switch
Auto reset SPST switch activated by refrigerant pressure on high side of refrigerant circuit. Cycles compressor off if refrigerant pressure rises to 426 ± 10 psig
and resets at 320 ± 20 psig. Provides protection against compressor damage due to loss of outdoor airflow.
Usage Guideline:
Isolation Relay
An SPDT relay which switches the low-ambient controller out of the outdoor fan motor circuit when the heat pump switches to heating mode.
Usage Guideline:
Required on all units when MotorMaster®—Low-Ambient Controller is installed.
Required for single-phase reciprocating
Long line
Low ambient cooling
Hard shut off expansion valve on indoor coil
Liquid line solenoid on indoor coil
Required for single-phase scroll compressors in the following applications:
Long line
Low ambient cooling
Suggested for all compressors in areas with a history of low voltage problems
Suggested when compressor power supply is marginal.
Suggested in reciprocating compressor applications with rapid pressure balance (RPB) expansion valve on indoor coil.
Required in low ambient cooling applications.
Required in long line applications.
Suggested in all commercial applications.
Required when low-ambient kit has been added.
Suggested in all field-connected split-system heat pumps.
Suggested in installations exposed to "very dirty" outdoor air.
Suggested in installations where condenser inlet air temperature exceeds 125°F (51.7°C).
Required in all heat pumps where low-ambient kit has been added.
compressors in the following applications:
5
Page 6
Accessory description and usage (Listed alphabetically)
10. Liquid-Line Solenoid Valve (LLS)
An electrically operated shutoff valve which stops and starts refrigerant liquid flow in response to compressor operation. It maintains a column of refrigerant
liquid ready for action at next compressor operation cycle. It also provides system protection against off-cycle refrigerant migration.
Note: When LLS is used with reciprocating compressors, Compressor Start Assist — Capacitor and Relay is required.
Usage Guideline:
11. Low-Ambient Pressure Switch
A long life pressure switch which is mounted to outdoor unit service valve. It is designed to cycle the outdoor fan motor in order to maintain head pressure
within normal operating limits (approximately 100 psig to 225 psig). The control will maintain working head pressure at low-ambient temperatures down to 0°F
(–17.8°C) when properly installed.
Usage Guideline:
12. MotorMaster®—Low-Ambient Controller
A fan speed control device activated by a temperature sensor. Designed to control condenser fan motor speed in response to the saturated, condensing temperature during operation in cooling mode only. For outdoor temperatures down to –20°F (–28.9°C), it maintains condensing temperature at 100°F ± 10°F (37.8°C
± –12°C).
Usage Guideline:
13. Outdoor Air Temperature Sensor
Designed for use with Carrier Thermostats listed in this publication. This device enables the thermostat to display the outdoor temperature. This device also is
required to enable special thermostat features such as auxiliary heat lock out.
Usage Guideline:
14. Outdoor Thermostat
An SPDT temperature-actuated switch which turns on supplemental electric heaters when outdoor air temperature drops below a user-selected set point.
Usage Guideline:
15. Secondary Outdoor Thermostat
An SPDT temperature-actuated switch which turns on third-stage of supplemental electric heaters when outdoor air temperature drops below the second-stage
set point.
Usage Guideline:
16. Sound Hood
Wraparound sound reducing cover for the compressor. Reduces the sound level by about 2 dBA.
Usage Guideline:
17. Thermostatic Expansion Valve (TXV) Bi-Flow
A modulating flow-control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving the
evaporator. Kit includes valve, adapter tubes, and external equalizer tube. Both hard shutoff and RPB valves are available.
Note: When using a hard shut off TXV with single phase reciprocating compressors, a Compressor Start Assist — Capacitor and Relay is required
Usage Guideline:
18. Time-Delay Relay
An SPST delay relay which briefly continues operation of indoor blower motor to provide additional cooling after the compressor cycles off.
Note: Most indoor unit controls include this feature. For those that do not, use the guideline below.
Usage Guideline:
Required in all heat pump long line applications to control refrigerant off cycle migration in the heating mode. A second LLS or hard shut off
TXV is required in heat pump long line applications for refrigerant off cycle migration in the cooling mode. See Long Line Application Guideline.
A Low-Ambient Pressure Switch or MotorMaster ®—Low-Ambient Controller must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).
A MotorMaster ®—Low-Ambient Controller or Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).
Suggested for all commercial applications.
Suggested for all Carrier thermostats listed in this publication.
Electric supplemental heat applications in non-variable speed indoor units when electric heat staging is desired.
Outdoor Thermostat applications where electric heater is capable of 3-stage operation.
Suggested when unit is installed closer than 15 ft to quiet areas—bedrooms, etc.
Suggested when unit is installed between two houses less than 10 ft apart.
Required to achieve ARI ratings in certain equipment combinations. Refer to combination ratings.
Required for use on all zoning systems.
See long line guideline.
For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to ARI Unitary Directory.
6
Page 7
Electrical data
UNIT
SIZE
018
024
030
036
042
048
060
VOLTS/PH
60 HZ
208-230/1253197
OPER VOLTS*COMPRESSOR
45.0
54.0
73.0
93.0
103.0
137.0
148.0
* Per missible limits of the voltage range at which unit will operate sat-
isfactorily. Operation outside these limits may result in unit failure.
† Time-delay fuse.
‡ Length shown is as measured 1 way along the wire path between
the unit and the service panel for voltage drop not to exceed 2%.
** If wire is applied at ambient greater than 30°C (86°F), consult Table
310-16 of the NEC (ANSI/NFPA 70). The ampacity of nonmetallic-
sheathed cable (NM), trade name ROMEX, shall be that of 60°C
MIN WIRE
SIZE
60°C/ 75°C**
14/14
14/14
12/12
12/12
10/10
8/10
6/8
10.6
12.0
16.6
18.5
21.6
23.9
32.1
FAN
FLAMCA
0.5
1.1
1.1
1.1
1.1
1.1
1.4
13.8
16.1
21.9
24.2
28.1
31.0
41.5
FLA— Full Load Amps
LRA— Locked Rotor Amps
MCA — Minimum Circuit Amps
RLA— Rated Load Amps
NOTE: Control circuit is 24v on all units and requires external power
source. Copper wire must be used from service disconnect to unit. All
motors/compressors contain internal overload protection.
MAX
LENGTH
(FT)
60°C/ 75°C‡
71/67
60/57
71/67
64/61
88/83
124/76
156/88
(140°F) conductors, per the NEC (ANSI/NFPA 70) Article 336-26.
If other than uncoated (non-plated), 60° or 75°C (140° or 167°F)
insulation, copper wire (solid wire for 10 AWG and smaller, stranded
wire for larger than 10 AWG) is used, consult applicable tables of
the NEC (ANSI/NFPA 70).
A-weighted sound power (dBA)
UNIT
SIZE-SERIES
018-33, 347864.467.771.873.869.466.863.5
024-33, 347857.563.669.474.266.963.661.3
030-33, 347856.759.367.874.467.465.664.5
036-33, 347855.560.066.573.573.067.559.0
042-33, 347953.559.567.575.571.565.561.0
048-33, 347862.961.468.373.371.266.861.5
060-33, 348064.963.470.375.373.268.863.5
STANDARD
RATING
1252505001000200040008000
NOTE: Tested in accordance with ARI Standard 270-95. (Not listed with ARI.)
TYPICAL OCTAVE BAND SPECTRUM (without tone adjustment)
MAX FUSE†
OR CKT
BKR AMPSMaxMinLRARLA
20
25
30
35
40
45
60
7
Page 8
Dimensions
-IN. DIA
8
/
3
-IN. DIA KNOCKOUT
8
-IN. DIA HOLE WITH
/
1
8
/
KNOCKOUT
FIELD POWER SUPPLY CONN
7
AND 1
1
ASQ
AIR DISCHARGE
-IN. DIA
8
/
7
FIELD CONTROL SUPPLY
CONN
HOLE
-IN. DIA LIQUID
8
/
LINE CONN
3
A97045
PAD DIMENSIONSAB C D E F G HJKLMNP
MINIMUM MOUNTING
C
/8″
7
2
/4″
1
1
AIR DISCHARGE
AIR IN
M
D DIA VAPOR LINE CONN
P
B
AIR IN
L
K
NOTES:
1. Allow 30 in. clearance to service side of
unit, 48 in. above unit, 6 in. on one side, 12 in.
3. Maximum outdoor operating ambient in heating mode
is 66°F.
4. Series designation is the 13th position of the unit
model number.
on remaining side, and 24 in. between units for proper airflow.
2. Minimum outdoor operating ambient in cooling mode is
55°F (unless low ambient control is used) max. 125°F.
5. Center of gravity .
DIMENSIONS (IN.)
J
AIR IN
H
G
F
E
N
AIR IN
TIEDOWN
/8 -IN. DIA
3
(2) PLACES
KNOCKOUTS
AIR DISCHARGE
8
01833, 3422-1/2 33-15/163-3/165/83-11/1618-1/819-3/421-5/814-3/818-7/822-1/1610-3/41114-1/422-1/2 x 22-1/2
SIZE SERIES
UNIT
02433, 343027-15/163-3/163/46-1/223-1/227-1/429-1/82026-3/829-9/1615-1/21511-3/430 x 30
03033, 343039-15/163-3/163/46-1/223-1/227-1/429-1/82026-3/829-9/1615-3/414-3/416-3/430 x 30
03633, 343029-15/163-3/163/46-1/223-1/227-1/429-1/82026-3/829-9/1614-1/4151430 x 30
04233, 343029-15/163-1/47/86-1/223-1/227-1/429-1/82026-3/829-9/1615-1/214-3/414-1/430 x 30
04833, 343033-15/163-1/47/86-1/223-1/227-1/429-1/82026-3/829-9/1615-1/214-1/414-1/230 x 30
06033, 343039-15/163-1/47/86-1/223-1/227-1/429-1/82026-3/829-9/1614-3/413-1/215-1/230 x 30
* Ratings are net values reflecting the effects of circulating fan heat. Supplemental electric heat is not included. Ratings are based on:
Cooling Standard: 80°F (27°C) db 67°F (19°C) wb indoor entering air temperature and 95°F (35°C) db air entering outdoor unit.
High-Temperature Heating Standard: 70°F (21°C) db indoor entering air temperature and 47°F (8°C) db 43°F (6°C) wb air entering outdoor unit.
Low-Temperature Heating Standard: 70°F (21°C) db indoor entering air temperature and 17°F (–8°C) db 15°F (11°C) wb air entering outdoor
unit.
† Outdoor section/indoor section combination tested in accordance with DOE test procedures for heat pumps. Ratings for other combinations are
determined under DOE computer simulation procedures.
‡ In most cases, only 1 method should be used to achieve TDR function. Using more than 1 method in a system may cause degradation in perfor-
mance. Use either the accessory Time-Delay Relay KAATD0101TDR or a furnace equipped with TDR.
** Requires field-installed TXV, except FC4 and FK4 which have TXV factory installed.
COP — Coefficient of Performance
HSPF — Heating Seasonal Performance Factor
SEER — Seasonal Energy Efficiency Ratio
TC— Total Capacity (Btuh)
TDR — Time-Delay Relay
TXV — Thermostatic Expansion Valve
14
Page 15
Detailed cooling capacities*
EVAPORATOR
AIR
CFMEWB
8595105115125
Capacity
MBtuh†
Total
System
kW**
Capacity
38AYC018-33, 34 Outdoor Section With F(A,B)4BN(F,C)024 Indoor Section
NOTE: When the required data falls between the published data, interpolation may be performed. Extrapolation is not an acceptable practice.
* Detailed cooling capacities are based on indoor and outdoor unit at same elevation per ARI standard 210/240-94. If additional tubing length and/or
indoor unit is located above outdoor unit, a slight variation in capacity may occur.
† Total and sensible capacities are net capacities. Blower motor heat has been subtracted.
‡ Sensible capacities shown are based on 80°F (27°C) entering air at the indoor coil. For sensible capacities at other than 80°F (27·C), deduct 835
Btuh (245 kW) per 1000 CFM (480 L/S) of indoor coil air for each degree below 80°F (27°C), or add 835 Btuh (245 kW) per 1000 CFM (480 L/S)
of indoor coil air per degree above 80°F (27°C).
** System kW is total of indoor and outdoor unit kilowatts.
†† At TVA rating indoor condition (75°F edb/63°F ewb). All other indoor air temperatures are at 80°F edb.
EWB – Entering Wet Bulb
Multipliers for Determining the Performance With Other Indoor Sections
Indoor
SectionSize
CC5A/CD5AA0601.001.13CK5A/CK5BT0601.001.03
CC5A/CD5AW0601.001.04CK5A/CK5BX0601.001.02
CE3AA0601.001.04COILS + 58CV(A,X)135-22 FURNACE
CK3BA0601.001.08CC5A/CD5AA0601.001.14
CK5A/CK5BA0601.001.08CC5A/CD5AW0601.001.07
CK5A/CK5BT0601.001.08CE3AA0601.001.06
CK5A/CK5BX0601.001.04CK3BA0601.001.03
FB4BNB0701.001.00CK5A/CK5BT0601.001.03
FC4CN(F,B)0601.001.04CK5A/CK5BX0601.001.02
FC4CNB0701.001.01
FG3AAA0601.001.06CC5A/CD5AA0601.001.14
FK4DNB0061.000.97CC5A/CD5AW0601.001.06
COILS + 58CV(A,X)110-22 FURNACECE3AA0601.001.06
CC5A/CD5AA0601.001.14CK3BA0601.001.02
CE3AA0601.001.06CK5A/CK5BA0601.001.02
CK3BA0601.001.03CK5A/CK5BT0601.001.02
CK5A/CK5BA0601.001.03CK5A/CK5BX0601.001.02
CapacityPowerCapacityPower
Heating
Indoor
SectionSize
COILS + 58CV(A,X)155-22 FURNACE
Heating
System Design
1. Intended for outdoor installation with free air inlet and outlet. Outdoor fan external static pressure available is less than 0.01-in. wc.
2. Minimum outdoor operating air temperature for cooling mode without low-ambient operation accessory is 55°F (12.8°C).
3. Maximum outdoor operating air temperature for cooling mode is 125°F (51.7°C).
4. Minimum outdoor operating air temperature for heating mode is –30°F (–34.4°C).
5. Maximum outdoor operating air temperature for heating mode is 66°F (18.9°C).
6. For reliable operation, unit should be level in all horizontal planes.
7. Maximum elevation of indoor coil above or below base of outdoor unit is: indoor coil above = 50 ft, indoor coil below = 150 ft.
8. For interconnecting refrigerant tube lengths greater than 50 ft horizontal or 20 ft vertical differential, consult Residential Split-System Long-Line
Application Guideline available from equipment distributor.
9. For more than 36 in. of refrigerant tubing buried in the ground, consult your local distributor.
10. Use only copper wire for electric connection at unit. Aluminum and clad aluminum are not acceptable for the type of connector provided.
11. Mismatches of indoor coil capacity more than 1 size larger than outdoor unit capacity may result in inadequate indoor comfort.
27
Page 28
Guide specifications
GENERAL
System Description
Outdoor-mounted, air-cooled, split-system heat pump unit
suitable for ground or rooftop installation. Unit consists of a
hermetic compressor, an air-cooled coil, propeller-type
condenser fan, and a control box. Unit will discharge supply
air upward as shown on contract drawings. Unit will be used
in a refrigeration circuit to match up to a packaged fan coil or
coil unit.
Quality Assurance
Unit will be rated in accordance with the latest edition of
ARI Standard 240.
Unit will be certified for capacity and efficiency, and listed
in the latest ARI directory.
Unit construction will comply with latest edition of ANSI/
ASHRAE and with NEC.
Unit will be constructed in accordance with UL standards
and will carry the UL label of approval. Unit will have C-UL
approval.
Unit cabinet will be capable of withstanding Federal Test
Method Standard No. 141 (Method 6061) 500-hr salt spray
test.
Air-cooled condenser coils will be leak tested at 217 psig
and pressure tested at 450 psig.
Delivery, Storage, and Handling
Unit will be shipped as single package only and is stored
and handled per unit manufacturer’s recommendations.
Warranty (for inclusion by specifying engineer)
U.S. and Canada only.
PRODUCTS
Equipment
Factory-assembled, single-piece, air-cooled heat pump unit.
Contained within the unit enclosure will be all factory wiring,
piping, controls, compressor, refrigerant charge (Puron®), and
special features required prior to field start-up.
Unit Cabinet
Unit cabinet will be constructed of galvanized steel,
bonderized, and coated with a powder coat paint.
Fans
Condenser fan will be direct-drive propeller type,
discharging air upward.
Air-Cooled, Split-System
Heat Pump
38AYC
1-1/2 to 5 Tons Nominal
Condenser fan motors will be totally enclosed, 1-phase type
with class B insulation and permanently lubricated bearings.
Shafts will be corrosion resistant.
Fan blades will be statically and dynamically balanced.
Condenser fan openings will be equipped with steel wire
safety guards.
Compressor
Compressor will be hermetically sealed.
Compressor will be mounted on rubber vibration isolators.
Condenser Coil
Condenser coil will be air cooled.
Coil will be constructed of aluminum fins mechanically
bonded to copper tubes which are then cleaned, dehydrated,
and sealed.
Refrigeration Components
Refrigeration circuit components will include liquid tube
shutoff valve with sweat connections, suction tube shutoff
valves with sweat connections, system charge of Puron®
refrigerant, POE compressor oil, accumulator, and reversing
valve.
Operating Characteristics
The capacity of the unit will meet or exceed Btuh at a
suction temperature of °F. The power consumption at
full load will not exceed kW.
Combination of the unit and the evaporator or fan coil unit
will have a total net cooling capacity of Btuh or greater
at conditions of CFM entering air temperature at the
evaporator at °F wet bulb and °F dry bulb, and air
entering the unit at °F.
The system will have a SEER of Btuh/watt or greater
at DOE conditions.
Electrical Requirements
Nominal unit electrical characteristics will be v,
phase, 60 hz. The unit will be capable of satisfactory
operation within voltage limits of v to v.
Unit electrical power will be single point connection.
Control circuit will be 24v.
Special Features
Refer to section of this literature identifying accessories and
descriptions for specific features and available enhancements.
Carrier Corporation • Indianapolis, IN 4623102-04
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4Page 28Catalog No. 523-80069Printed in U.S.A.PC 101Form 38AYC-5PD
Tab5a 5a
Replaces: 38AYC-4PD
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