American Standard 4A6H4018D1000A Service manual

IMPORTANT — This document contains a wiring diagram, a parts list, and service information. This is customer prop-
erty and is to remain with this unit. Please return to service information pack upon completion of work.
NOTICE: Manufacturer has a policy of continuous product and product data improvement and it
reserves the right to change design and specifications without notice.
WARNING
!
THIS INFORMATION IS INTENDED FOR USE BY INDIVIDUALS POS-
SESSING ADEQUATE BACKGROUNDS OF ELECTRICAL AND ME-
CHANICAL EXPERIENCE. ANY ATTEMPT TO REPAIR A CENTRAL AIR
CONDITIONING PRODUCT MAY RESULT IN PERSONAL INJURY AND
OR PROPERTY DAMAGE. THE MANUFACTURER OR SELLER CAN-
NOT BE RESPONSIBLE FOR THE INTERPRETATION OF THIS INFOR-
MATION, NOR CAN IT ASSUME ANY LIABILITY IN CONNECTION WITH
ITS USE.
CAUTION
!
RECONNECT ALL GROUNDING DEVICES.
ALL PARTS OF THIS PRODUCT CAPABLE OF CONDUCTING
ELECTRICAL CURRENT ARE GROUNDED. IF GROUNDING
WIRES, SCREWS, STRAPS, CLIPS, NUTS OR WASHERS USED
TO COMPLETE A PATH TO GROUND ARE REMOVED FOR
SERVICE, THEY MUST BE RETURNED TO THEIR ORIGINAL
POSITION AND PROPERLY FASTENED.
WARNING:
HAZARDOUS VOLTAGE - DISCONNECT POWER and DISCHARGE
CAPACITORS BEFORE SERVICING
CAUTION
!
UNIT CONTAINS R-410A REFRIGERANT!
R-410A OPERATING PRESSURE EXCEEDS THE
LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS
REQUIRED. FAILURE TO USE PROPER SERVICE
TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR
PERSONAL INJURY.
SERVICE
USE ONLY R-410A REFRIGERANT AND
APPROVED POE COMPRESSOR OIL.
04/15
PRODUCT SPECIFICATIONS
OUTDOOR UNIT 12
POWER CONNS. — V/PH/HZ 3
MIN. BRCH. CIR. AMPACITY
BR. CIR. PROT. RTG. – MAX. (AMPS)
COMPRESSOR
NO. USED - NO. SPEEDS
VOLTS/PH/HZ
R.L. AMPS 7- L.R. AMPS
FACTORY INSTALLED
START COMPONENTS 8
INSULATION/SOUND BLANKET
COMPRESSOR HEAT
OUTDOOR FAN
DIA. (IN.) - NO. USED
TYPE DRIVE - NO. SPEEDS
CFM @ 0.0 IN. W.G. 4
NO. MOTORS - HP
MOTOR SPEED R.P.M.
VOLTS/PH/HZ
F.L. AMPS
OUTDOOR COIL — TYPE
ROWS - F.P.I.
FACE AREA (SQ. FT.)
TUBE SIZE (IN.)
REFRIGERANT CONTROL
REFRIGERANT
LBS. — R-410 (O.D. UNIT) 5
FACTORY SUPPLIED
LINE SIZE - IN. O.D. GAS 6
LINE SIZE - IN. O.D. LIQ. 6
CHARGING SPECIFICATION
SUBCOOLING
DIMENSIONS
CRATED (IN.)
WEIGHT
SHIPPING (LBS.)
NET (LBS.)
Service Facts
© 2015 American Standard Heating & Air Conditioning
4A6H4018D-SF-1A-EN
Split System
Heat Pump
4A6H4018D1000A
1Certified in accordance with the Air-Source Unitary Heat Pump Equipment certification
program, which is based on AHRI standard 210/240.
2Rated in accordance with AHRI standard 270.
3Calculated in accordance with Natl. Elec. Codes. Use only HACR circuit breakers or
fuses.
4Standard Air — Dry Coil — Outdoor
5This value approximate. For more precise value see unit nameplate.
6Max. linear length 60 ft.; Max. lift - Suction 60 ft.; Max lift - Liquid 60 ft.
For greater length consult refrigerant piping software Pub. No. 32-3312-0*
(* denotes latest revision).
7This value shown for compressor RLA on the unit nameplate and on this specification
sheet is used to compute minimum branch circuit ampacity and max. fuse size. The
value shown is the branch circuit selection current.
8No means no start components. Yes means quick start kit components. PTC means
positive temperature coefficient starter.
CONTAINS REFRIGERANT!
SYSTEM CONTAINS OIL AND REFRIGERANT UNDER
HIGH PRESSURE. RECOVER REFRIGERANT TO RELIEVE
PRESSURE BEFORE OPENING SYSTEM.
Failure to follow proper procedures can result in personal
illness or injury or severe equipment damage.
CAUTION
!
HOT SURFACE!
DO NOT TOUCH TOP OF COMPRESSOR.
May cause minor to severe burning.
CAUTION
!
4A6H4018D1000A
208/230/1/60
9
15
DURATION™
1 - 1
208/230/1/60
6.4 - 38.6
YES
NO
NO
PROPELLER
23 - 1
DIRECT - 1
3150
1 - 1/8
825
200/230/1/60
0.77
SPINE FIN™
1 - 24
13.43
3/8
EXPANSION VALVE
5 LBS. - 14 OZ.
YES
5/8
3/8
12°F
H X W X D
34 x 30.1 x 33
204
176
TUBING INFORMATION
LINE TYPE REFRIGERANT TO ADD AT SPECIFIED
ADDITIONAL LENGTH
Suction Liquid 20 ft 30 ft 40 ft 50 ft 60 ft
5/8" 3/8" 3 oz 8 oz 14 oz 20 oz 25 oz

2 4A6H4018D-SF-1A-EN
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
The manufacturer recommends installing approved matched indoor and
outdoor systems.
All split systems are AHRI rated with only EEV/TXV indoor systems.
The benefits of installing approved indoor and outdoor split systems are maxi-
mum efficiency, optimum performance and the best overall system reliability.
The following charging methods are therefore prescribed for systems with
indoor EEV/TXVs.
1. Subcooling (in the cooling mode) is the only recommended method of
charging above 55°F ambient temperatures.
2. For best results - the indoor temperature should be kept between 70°F
to 80°F. Add system heat if needed.
3. At start-up, or whenever charge is removed or added, the system must
be operated for a minimum twenty (20) minutes to stabilize before ac-
curate measurements can be made.
4. Measure Liquid Line Temperature and Refrigerant Pressure at service
valves.
5. Determine total refrigerant line length, and height (lift) if indoor section is
above the condenser. Use the Subcool Charging Chart Corrections
Table to calculate any additional subcooling required for your specific
application.
6. Determine the Design Subcooling from the unit nameplate or Service
Facts. Add any additional amount of subcooling calculated in Step 5 to
the Design Subcooling to arrive at the final subcooling value.
7. Locate this value in the appropriate column of the R-410-A Refrigerant
Charging Chart. Locate your liquid line temperature in the left column
of the chart, and the intersecting liquid line pressure under your calcu-
lated subcooling value column. Add refrigerant to raise the pressure to
match the chart, or remove refrigerant to lower the pressure. Again, wait
twenty (20) minutes for the system conditions to stabilize before adjust-
ing charge again.
8. When system is correctly charged, you can refer to System Pressure
Tables to verify typical performance.
SCHEMATIC DIAGRAM
1 1/2 Ton
Add 3°
Add 2°
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10 20 25 30 40 60
Add 1° of Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

4A6H4018D-SF-1A-EN 3
SUBCOOLING CHARGING BELOW 55°F OD
AMBIENT – IN HEATING ONLY
1. The Subcool Charging Method in cooling is not recommended below
55°F outdoor ambient.
2. The only recommended method of charging at outdoor ambients
below 55°F, is to weigh in the charge in the heating mode.
3. Use Nameplate charge plus standard charge adders for line length.
4. Check liquid line temperature and pressure (at the OD valves) to
obtain
a minimum of 10°F subcooling.
5. Add charge if a minimum of 10°F subcooling is not obtained with the
nameplate charge plus line length correction.
6. It is important to return in the spring
or summer to accurately charge the system in the cooling mode at
outdoor ambients above 55°F.
8910 11 12 13 14
55 179 182 185 188191 195 198
60 195 198 201 204208 211 215
65 211 215 218 222225 229 232
70 229 232 236 240243 247 251
75 247 251 255 259263 267 271
80 267 271 275 279283 287 291
85 287 291 296 300304 309 313
90 309 313 318 322 327 331 336
95 331 336 341 346 351 355 360
100 355 360 365 370 376 381 386
105 381 386 391 396 402 407 413
110 407 413 418 424 429 435 441
115 435 441 446 452 458 464 470
120 464 470 476 482 488 495 501
125 495 501 507 514 520 527 533
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or
Installer's Guide for charging method.
LIQUID
TEMP
(˚F)
DESIGN SUBCOOLING (˚F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev. 2
WIRING DIAGRAM

4 4A6H4018D-SF-1A-EN
TROUBLESHOOTING
DEFROST TERMINATION TEMPERATURE
Measure sub-cooling at
the outdoor unit.
Is subcooling greater
than 8°?
NO
YES
Is outdoor
ambient above
55 °F?
Remove sensing bulb from the
suction line. Observe liquid
pressure and suction pressure while
holding the bulb in bare hand for
one minute.
Does Liquid pressure decrease and
suction pressure increase?
YES
Replace the
TXV
TXV is OK
Measure superheat on suction
line at TXV sensing bulb.
Is superheat over 6°F and
under 20°F?
NO
YES
Verify system charge
using Service Facts
Before starting, insure proper fan motor
operation and both indoor and outdoor
coils are clean and clear of ice.
Stop. Outdoor
ambient is too
warm for this
test
NO
YES
NO
Troubleshooting Outdoor TXV / Heating Mode
J1
U1
J2
J3
FRC_DFT
TST
TEST_COMMON
JUMPER 2
TEST PINS
Defrost controls have a selectable termination temper-
ature. Cutting jumper J2 (shown below) will achieve a
termination temperature of 70° when the ambient tem-
perature is below 30° (see table at left).
Defrost Board
Detail
Defrost Termination Temperatures
Outdoor
Temperature
Termination
Temperature
As
Shipped
>22°F 47°F
10°F–22°F ODT + 25°F
6°F–10°F 35°F
Cut
Jumper 2
>30°F 47°F
6°F–30°F 70°F
All < 6°F 12 min. or 35°F
every 3 hrs.

4A6H4018D-SF-1A-EN 5
TROUBLESHOOTING
Check for open IOL
(Internal Overload)
Check resistance of
C to S and C to R
Does the
resistance check
show an open
circuit from C to S
or C to R?
YES Allow compressor
time to cool and
re-test
NO
Check for open
windings.
YES
Does a resistance check
show an open circuit
between R and S?
Replace the
compressor
NO
Check for locked
rotor
Is voltage present
at C to S and C
to R with locked
rotor amps on C?
YES
Check Start-
Capacitor and
Relay (if present)
and Run Capacitor
Do the start
components and
run capacitor
check good?
YES Replace the
compressor
NO
Replace start
components and/
or run capacitor
NO
Check wiring to
compressor
C, S and R
Check for high
voltage to contactor
Is high voltage present
at T1 and T2 ?
YES
NO
Check power
supply from
disconnect and/or
breaker panel.
Compressor won’t run
Contactor is closed

6 4A6H4018D-SF-1A-EN
L2 L1
T2 T1
IN
OUT
L2 L1
T2 T1
Single Pole Contactor (MS)* Double Pole Contactor (MS)*
Contactor Coil
24 VAC
HIGH
VOLTAGE
IN
OUT
HIGH
VOLTAGE
*Refer to Wiring Diagram to determine if a single pole or double pole contactor is used.
Is contactor
energized?
(contacts closed)
Is voltage
present at
contactor coil?
Replace contactor
YES
NO
NO
Check for 24 volts AC
across contactor coil
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
NO
YES
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
Jumper R to Y low
voltage terminals
at thermostat sub
base.
Does the
contactor
energize?
NO
Repair or replace
connecting wiring
YES Go To: Compressor won’t run
Replace the room
thermostat
YES
Compressor fails to start
Contactor check
TROUBLESHOOTING

4A6H4018D-SF-1A-EN 7
Heating Refrigeration Cycle
Cooling Refrigeration Cycle
Printed from D156861 REV A
*DRIER MAY BE SHIPPED WITH THE UNIT AND
IS REQUIRED TO BE INSTA LLED EXTERNALLY.
*DRIER MAY BE SHIPPED WITH THE UNIT AND
IS REQUIRED TO BE INSTA LLED EXTERNALLY.
REFRIGERANT CIRCUITS

American Standard Heating & Air Conditioning
www.americanstandardair.com
American Standard Heating & Air Conditioning has a policy of continuous product and product data
improvement and it reserves the right to change design and specifications without notice.
PRESSURE CURVES FOR 4A6H4018D1
TAM7A0A24H21
TAM7A0A24H21
Cooling Heating
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ DISCHARGE OR SUCTION PRESSURE IN LEFT
COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION ACTUAL:
(4) DISCHARGE PRESSURE IS 315 PSIG. DISCHARGE PRESSURE SHOULD BE +/- 10 PSIGOF CHART
(5) SUCTION PRESSURE IS 144 PSIG. SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 5/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4A6H4018D1
(2)
(5) (3)
(1)
110
115
120
125
130
135
140
145
150
155
160
165
170
175
55 65 75 85 95 105 115
(2)
(4) (3)
(1)
200
250
300
350
400
450
500
55 65 75 85 95 105 115
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
40
50
60
70
80
90
100
110
120
130
140
150
160
170
-5 515 25 35 45 55 65
200
250
300
350
400
450
-5 515 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.
INDOOR ENTERING DRY BULB CURVESTOP TO BOTTOM
80, 70, AND 60 DEG F.