American Standard 4A7A5 Assembly instructions

© 2007 American Standard Inc. All Rights Reserved
Since the manufacturer has a policy of continuous product
and product data improvement, it reserves the right to
change design and specifications without notice.
11-AC24D1-1
These instructions do not cover all variations in systems
nor provide for every possible contingency to be met in
connection with installation. All phases of this installa-
tion must comply with NATIONAL, STATE AND LOCAL
CODES. Should further information be desired or should
particular problems arise which are not covered sufficiently for
the purchaser’s purposes, the matter should be referred to your
installing dealer or local distributor.
A. GENERAL
▲ WARNIN
G
:
This information is intended
for use by individuals possessing adequate backgrounds
of electrical and mechanical experience. Any attempt to
repair a central air conditioning product may result in
personal injury and or property damage. The manufac-
turer or seller cannot be responsible for the interpreta-
tion of this information, nor can it assume any liability in
connection with its use.
NOTE: AMERICAN STANDARD HAS ALWAYS RECOM-
MENDED INSTALLING AMERICAN STANDARD AP-
PROVED MATCHED INDOOR AND OUTDOOR SYSTEMS.
THE BENEFITS OF INSTALLING APPROVED MATCHED
SYSTEMS ARE MAXIMUM EFFICIENCY, OPTIMUM PER-
FORMANCE AND BEST OVERALL SYSTEM RELIABILITY.
▲ WARNIN
G
:
These units use R-410A refrig-
erant which operates at 50 to 70% higher pressures than
R-22. Use only R-410A approved service equipment. Re-
frigerant cylinders are painted a “Rose” color to indicate
the type of refrigerant and may contain a “dip” tube to
allow for charging of liquid refrigerant into the system.
All R-410A systems use a POE oil that readily absorbs
moisturefromtheatmosphere.Tolimitthis“hygroscopic”
action, the system should remain sealed whenever pos-
sible. If a system has been open to the atmosphere for
more than 4 hours, the compressor oil must be replaced.
Never break a vacuum with air and always change the
driers when opening the system for component replace-
ment. For specific handling concerns with R-410A and
POE oil, reference Retrofit Bulletin APB2001-01.
Check for transportation damage after unit is uncrated. Report
promptly, to the carrier, any damage found to the unit.
To determine the electrical power requirements of the unit, refer
to the nameplate of the unit. The electrical power available must
agree with that listed on the nameplate.
B. LOCATION AND PREPARATION OF THE UNIT
1. When removing unit from the pallet, notice the tabs on the
basepan. Remove tabs by cutting with a sharp tool as shown on
page 2, Figure 2, and slide unit off of pallet.
2. The unit should be set on a level support pad at least as large
as the unit base pan, such as a concrete slab.
Condensing Units
INSTALLER'S GUIDE
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
5 FT. ABOVE UNIT — UNRESTRICTED
1
Models: 4A7A5
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.
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.

PAGE 2 Pub.No.11-AC24D1-1
INSTALLER'S GUIDE
Pressure taps are provided on the service valves of outdoor unit
for compressor suction and liquid pressures.
The indoor end of the recommended refrigerant line sets may be
straight or with a 90 degree bend, depending upon situation
requirements. This should be thoroughly checked out before
ordering refrigerant line sets.
The gas line must always be insulated.
▲
C
A
U
TI
O
N:
Inscrollcompressorapplications,
dome temperatures may be hot. Do not touch top of
compressor, may cause minor to severe burning.
The units are factory charged with the system charge required
when using fifteen (15) feet of rated connecting line. Unit
nameplate charge is with twenty-five (25) feet of line set.
Final refrigerant charge adjustment is necessary. Use the
Charging Information on Page 6 or in the unit Service Facts.
1. Determine the most practical way to run the lines.
2. Consider types of bends to be made and space limitations.
NOTE: Largediameter tubing will be verydifficult to rebend once
it has been shaped.
3. Determine the best starting point for routing the refrigerant
tubing — INSIDE OR OUTSIDE THE STRUCTURE.
4. Provide a pull-thru hole of sufficient size to allow both liquid
and gas lines.
5. Be sure the tubing is of sufficient length.
6. Uncoil the tubing — do not kink or dent.
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the following
precautions should be taken:
a. When the refrigerant lines have to be fastened to floor
joists or other framing in a structure, use isolation type hangers.
b. Isolation hangers should also be used when refrigerant
lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant lines run through a wall or sill, they
should be insulated and isolated.
d. Isolate the lines from all ductwork.
D. SERVICE VALVE OPERATION
BRASS LIQUID AND GAS LINE SERVICE VALVES
The Brass Liquid and Gas Line Service Valves are factory shipped
in the seated position to hold factory charge. The pressure tap
service port (when depressed) opens only to the field brazing side
of the valve when the valve is in the seated position. The liquid
line valve is not a back seating valve (see WARNING below).
▲ WARNIN
G
:
Extreme caution should be
exercised when opening the Liquid and Gas Line Service
Valves. Turn valve stem counterclockwise only until the
stem contacts the rolled edge. (See Figures 3 and 5.) No
torqueisrequired. Failureto followthiswarningwillresult
in abrupt release of system charge and may result in per-
sonalinjuryand/orpropertydamage.
3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12" from any
wallor surrounding shrubbery toinsureadequateairflow. Clear-
ance must be provided in front of control box (access panels) &
any other side requiring service access to meet National Electri-
cal Code. Also, the unit location must be far enough away from
any structure to prevent excess roof run-off water from pouring
directly on the unit. Do not locate unit(s) close to bedroom(s).
4. The top discharge area must be unrestricted for at least
five (5) feet above the unit.
5. When the outdoor unit is mounted on a roof, be sure the roof
will support the unit’s weight. Properly selected isolation is
recommended to prevent transmission to the building structure.
6. The maximum length of refrigerant lines from outdoor to
indoor unit should NOT exceed sixty (60) feet.
7. If outdoor unit is mounted above the air handler, maximum
lift should not exceed sixty (60) feet (suction line). If air handler
is mounted above condensing unit, maximum lift should not
exceed sixty (60) feet (liquid line).
8. Locate and install indoor coil or air handler in accordance
with instruction included with that unit.
C. INSTALLING REFRIGERANT LINES
▲
C
A
U
TI
O
N:
If using existing refrigerant lines
make certain that all joints are brazed, not soldered.
Condensing units have provisions for braze connections.
BASEPAN TAB REMOVAL
2
3LIQUID LINE SERVICE VALVE

Pub.No.11-AC24D1-1 PAGE 3
INSTALLER'S GUIDE
NOTICE: Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the flame
directly off of the basepan.
7. Usea DryNitrogenPurgeandBrazing Alloywithoutfluxwhen
brazing the field line to the copper factory connection. Flow dry
nitrogen into either valve pressure tap port, thru the tubing and
out the other port while brazing.
8. Braze using accepted good brazing techniques.
LEAK CHECK
IMPORTANT: Replace pressure tap port valve core before
attaching hoses for evacuation.
After the brazing operation of refrigerant lines to both the
outdoor and indoor units is completed, the field brazed connec-
tions must be checked for leaks. Pressurize through the service
valve ports, the indoor unit and field refrigerant lines with dry
nitrogen to 350-400 psi. Use soap bubbles or other leak-checking
methods to see that all field joints are leak-free! If not, release
pressure; then repair!
SYSTEM EVACUATION
NOTE: Since the outdoor unit has a refrigerant charge, the gas
and liquid line valves must remain closed.
1. Upon completion of leak check, evacuate the refrigerant lines
and indoor coil before opening the gas and liquid line valves.
2. Attach appropriate hoses from manifold gauge to gas and
liquid line pressure taps.
NOTE: Unnecessary switching of hoses can be avoided and
complete evacuation of all lines leading to sealed system can be
accomplished with manifold center hose and connecting branch
hose to a cylinder of R-410A and vacuum pump.
3. Attach center hose of manifold gauges to vacuum pump.
4. Evacuate until the micron gauge reads no higher than
350 microns.
5. Close off valve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one (1)
minute, then evacuation is incomplete or system has a leak.
6. If vacuum gauge does not rise above 500 microns in one (1)
minute, the evacuation should be complete.
7. Blank off vacuum pump and micron gauge, close valves on
manifold gauge set.
NOTE: DO NOT VENT REFRIGERANT INTO THE
ATMOSPHERE.
8. The liquid line shut-off valve can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stem and
back out counterclockwise until valve stem just touches rolled
edge (approximately five [5] turns) observing WARNING
statement on page 2. See Figure 3.
NOTE: A 3/16" Allen wrench is required to open liquid line
service valve. A 1/4" Open End or Adjustable wrench is required
to open gas line valve. A 3/4" Open End wrench is required to take
off the valve stem cap.
9. Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE REPLACED to prevent leaks.
Replacevalve stemandpressuretap cap fingertight,then tighten
an additional 1/6 turn.
BRASS GAS LINE BALL SERVICE VALVE
The Brass Gas Line Ball Service Valve is shipped in the closed
position to hold the factory refrigerant charge. The pressure tap
service port (when depressed) opens only to the field brazing side
when the valve is in the closed position.
The Gas Line Service Valve is full open with a 1/4 turn. See
Figure 4.
BRAZING REFRIGERANT LINES
1. Remove lower access cover to access service valves.
2. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surfaces of stub tubes prior
to brazing.
3. Cut and fit tubing, minimizing the use of sharp 90° bends.
4. Insulate the entire gas line and its fittings.
5. Do NOT allow uninsulated liquid line to come in direct
contact with bare gas line.
6. Precautions should be taken to avoid heat damage to
the pressure tap valve core during brazing. It is recom-
mended that the pressure tap port valve core be removed
and a wet rag wrapped around the valve body.
NOTICE: Use care to make sure that no moisture enters pressure
tap port, while wet rag is being used.
CAP 1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
GAS LINE CONNECTION
UNIT SIDE
OF VALVE
PRESSURE TAP PORT
GAS LINE BALL SERVICE VALVE
4
5GAS LINE SERVICE VALVE

PAGE 4 Pub.No.11-AC24D1-1
INSTALLER'S GUIDE
10. The gas valve can now be opened. For a ball type gas valve,
openthe gas valve by removing theshut-offvalvecapand turning
the valve stem 1/4 turn counterclockwise, using 1/4" Open End or
Adjustable wrench. See Figure 4. For brass gas line service valve
opening, follow 8 and 9 on page 3. See Figure 5.
11. The gas valve is now open for refrigerant flow. Replace valve
stem cap to prevent leaks. Again, these caps MUST BE RE-
PLACED to prevent leaks. Replace valve stem and pressure tap
cap finger tight, then tighten an additional 1/6 turn. See Figure 4.
If refrigerant lines are longer than fifteen (15) feet and/or a
different size than recommended, it will be necessary to adjust
system refrigerant charge upon completion of installation. See
page 6 or unit Service Facts.
E. ELECTRICAL CONNECTIONS
▲ WARNIN
G
:
When installing or servicing
this equipment, ALWAYS exercise basic safety precau-
tions to avoid the possibility of electric shock.
1. Power wiring and grounding of equipment must comply with
local codes.
2. Power supply must agree with equipment nameplate.
3. Install a separate disconnect switch at the outdoor unit.
4. Ground the outdoor unit per local code requirements.
5. Provide flexible electrical conduit whenever vibration trans-
mission may create a noise problem within the structure.
6. The use of color coded low voltage wire is recommended to
simplify connections between the outdoor unit, the thermostat
and the indoor unit.
Table 1 — NEC Class II Wiring
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 FT
16 AWG 225 FT.
14 AWG 300 FT.
7. Table 1 defines maximum total length of low voltage wiring
from outdoor unit, to indoor unit, and to thermostat.
8. Mount the indoor thermostat in accordance with instruction
included with the thermostat. Wire per appropriate hookup
diagram (included in these instructions).
F. COMPRESSOR START-UP
After all electrical wiring is complete, SET THE THERMOSTAT
SYSTEMSWITCH IN THE OFFPOSITION SO COMPRESSOR
WILL NOT RUN, and apply power by closing the system main
disconnect switch. This will activate the compressor sump heat
(whereused). Do not change theThermostatSystemSwitchuntil
power has been applied for one (1) hour. Following this procedure
will prevent potential compressor overload trip at the initial
start-up.
G. OPERATIONAL AND CHECKOUT PROCEDURES
Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction on
page 8. To obtain proper performance, all units must be operated
and charge adjustments made in accordance with procedures
found on page 6 and in the Service Facts.
IMPORTANT: Perform a final unit inspection to be sure that
factory tubing has not shifted during shipment. Adjust tubing if
necessary so tubes do not rub against each other when the unit
runs. Also be sure that wiring connections are tight and wire
routing is secure.
H. SEACOAST SALT SHIELD
BAYSEAC001 (Seacoast Kit) is available for application on units
installed within one (1) mile of salt water, including seacoasts
and inland waterways.
I. TROUBLESHOOTING
REFRIGERANT CIRCUIT
Liquid Pressure Too High
Liquid Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback TXV System
I.D. Coil Frosting
Compressor Runs Inadequate or No Cooling
ELECTRICAL
Compressor & O.D. Fan Do Not Start
Compressor Will Not Start But O.D. Fan Runs
O.D. Fan Won’t Start
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start
SYSTEM FAULTS
P - Primary Causes S - Secondary Causes
P
P
P
S
S
PS
S
S
S
S
P
S
S
S
P
P
P
S
S
S
S
S
S
S
P
P
P
S
P
P
S
S
S
P
P
P
P
P
P
P
P
P
P
S
S
S
S
P
P
PP
P
S
S
PSPSS S S S
S
S
P
P
P
P
P
S
P
P
POWER SUPPLY
HIGH VOLTAGE WIRING
COMPR. IOL
RUN CAPACITOR
START CAPACITOR
START RELAY
CONTACTOR CONTACTS
LOW VOLTAGE WIRING
CONTROL TRANSFORMER
CONTACTOR COIL
LOW VOLTAGE FUSE
STUCK COMPRESSOR
INEFFICIENT COMPRESSOR
REFRIGERANT UNDERCHARGE
REFRIGERANT OVERCHARGE
EXCESSIVE EVAP. LOAD
NONCONDENSABLES
RESTRICTED O.D. AIRFLOW
O.D. AIR RECIRCULATION
TXV STUCK OPEN
SUPERHEAT
RESTRICTED I.D. AIRFLOW
REF. CIRCUIT RESTRICTIONS
O.D. FAN SPEED SWITCH
TROUBLESHOOTING CHART — WHAT TO CHECK

Pub.No.11-AC24D1-1 PAGE 5
INSTALLER'S GUIDE
TYPICAL FIELD WIRING DIAGRAMS
Notes:
1. Be sure power supply agrees with equipment nameplate.
2. Power wiring and grounding of equipment must comply with local codes.
3. Low voltage wiring to be No. 18 AWG minimum conductor.
4. ODT-B must be set lower than ODT-A.
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
LEGEND
FACTORY WIRING
FIELD WIRING
PRINTED FROM B152901 P02
PRINTED FROM B152903 P02
NOTE
*
*W2 present only on 2 stage
thermostat and furnace

PAGE 6 Pub.No.11-AC24D1-1
INSTALLER'S GUIDE
American Standard has always recommended installing
American Standard approved matchedindoorandoutdoor systems.
All American Standard split systems are ARI rated with only
TXV indoor systems.
Thebenefitsofinstallingapprovedindoorandoutdoorsplitsystems
aremaximumefficiency,optimumperformanceandthebestoverall
system reliability.
The following charging methods are therefore pre-
scribed for systems with indoor TXVs.
1. Subcooling(in thecooling mode)is theonlyrecom-
mendedmethod ofchargingabove55°Fambient
temperatures.
2. Forbest results-theindoor 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 mini-
mum twenty (20) minutes to stabilize before
accurate measurements can be made.
4. Measure Liquid Line Temperature and Refriger-
ant Pressure at service valves.
5. Determinetotalrefrigerantlinelength,andheight
(lift) if indoor section is above the condenser.
6. Determine the Design Subcool Charging Tem-
perature from the unit nameplate.
7. Locate this value in the appropriate column of the
Subcooling Charging Table. Locate your liquid
line temperature in the left column of the table,
and the intersecting liquid line pressure under
yournameplatesubcool value column. Add refrig-
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE
60
50
40
30
25
Add 10 psig to Subcool Charging Table Pressure
20
15
Use Design Subcool Value from Table
10
0
Subtract 10 psig from S.C. Table Pressure
10 20 25 30 40 60 80
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
8 9 10 11 12 13 14
55 179 182 185 188 191 195 198
60 195 198 201 204 208 211 215
65 211 215 218 222 225 229 232
70 229 232 236 240 243 247 251
75 247 251 255 259 263 267 271
80 267 271 275 279 283 287 291
85 287 291 296 300 304 309 313
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
erant to raise the pressure to match the table, or remove
refrigerant to lower the pressure. Again, wait twenty (20)
minutes for the system conditions to stabilize before adjusting
chargeagain.
8. When system is correctly charged, you can refer to System
Pressure Curves (in Service Facts) to verify typical performance.

Pub.No.11-AC24D1-1 PAGE 7
INSTALLER'S GUIDE
From Dwg. 21D152862 Rev. 20
4A7A5 OUTLINE DRAWING
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).
MODELS BASE FIG. A B C D E F G H J K
4A7A5018A 4 1 841 (33-1/8) 946 (37-1/4) 870 (34-1/4) 1/2 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5024A 4 1 841 (33-1/8) 946 (37-1/4) 870 (34-1/4) 5/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5030A 4 1 841 (33-1/8) 946 (37-1/4) 870 (34-1/4) 3/4 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5036A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 3/4 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5042A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 3/4 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5048A 4 1 1147 (45-1/8) 946 (37-1/4) 870 (34-1/4) 7/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
4A7A5060A 4 1 1147 (45--1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)

Pub.No.11-AC24D1-1
7/07
INSTALLER'S GUIDE
Technical Literature - Printed in U.S.A.
American Standard Inc.
Troup Highway
Tyler, TX 75707
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
1. Refrigerant Line, Leak checked...................... [ ]
2. Suction Lines and Fittings
properly insulated ........................................... [ ]
3. Have all Refrigerant Lines been secured and
isolated properly? ........................................... [ ]
4. Have passages through masonry been
sealed? If mortar is used, prevent mortar
from coming into direct contact with
copper tubing.................................................. [ ]
5. Verify tightness of all electrical connects ........ [ ]
6. Observe outdoor fan during on cycle for
clearance and smooth operation .................... [ ]
7. Indoor coil drain line drains freely.
Pour water into drain pan ............................... [ ]
8. Supply registers and return grilles
open and unobstructed................................... [ ]
9. Return air filter installed .................................. [ ]
10. Thermostat thermometer is accurate.
Check against a reliable thermometer.
Adjust per instructions with thermostat ........... [ ]
11. Is correct speed tap being used?
(Indoor blower motor) ..................................... [ ]
12. Operate complete system in each mode
to insure safe operation. ................................. [ ]
MOUNTING HOLE LOCATION
From Dwg. 21D152989 Rev. 0
Note: All Dimensions Are
In MM (Inches).
NOTE:
For model base size,
see table on page 7.