American Standard 2A7A1018A Assembly instructions

© 2005 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-AC11D2-5
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.
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 par-
ticular 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
Thefollowinginstructionscover2A7A5,2A7A4,2A7A2,&2A7A1
Condensing Units.
NOTE: The 2A7A4, 2A7A2,& 2A7A1 outdoor units, except
for the 5 ton models, may be used with indoor units
equippedwithThermostaticExpansionValveorAccutron™
Flow Control Check Valve (F.C.C.V.) assembly for refriger-
ant flow control only. The 2A7A5 & all 5 ton outdoor units
must be used with indoor units equipped with Thermo-
static Expansion Valve only.
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 & 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 in
Figure 2 (see page 2).
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. If this is not the
application used please reference ALG-APG0*-EN (*latest revi-
sion number).
3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12" from any
wall or surrounding shrubbery to insure adequate airflow.
Clearance must be provided in front of control box (access
panels) & any other side requiring service access to meet
National Electrical 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. When choosing the
location of the unit(s), sound transmission through air and
Condensing Units
Models:2A7A5024-048, 2A7A4018-060,
2A7A2018-060 & 2A7A1018-060
INSTALLER'S GUIDE
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
TOP DISCHARGE — UNRESTRICTED
5 FT. ABOVE UNIT
1
refrigerant lineset should be taken into consideration. It is
recommended to locate unit(s) away from areas (bedrooms, etc.)
where such sound could be objectionable.
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.
NOTE: Refer to “Refrigerant Piping Software” Pub. No.
32-3312-0*, and “Refrigerant Piping Manual” Pub. No.
32-3009-0* (the position of the * denotes latest revision
number).

PAGE 2 Pub. No. 11-AC11D2-5
INSTALLER'S GUIDE
SEALING CAP
ADAPTER
FLOW CONTROL
CHECK VALVE
(F.C.C.V.) ORIFICE
FIELD SUPPLIED
LIQUID LINE
AS SHIPPED
BODY
ACCUTRON
TM
COMPONENTS
C. ACCUTRON™ FLOW CONTROL VALVE
If the indoor unit System Refrigerant Flow control is an
Accutron™ orifice and check valve assembly, an orifice size
change may be necessary. See Figure 3.
The outdoor model determines the required orifice size. Check
the listed orifice size on nameplate of the selected outdoor model.
If the indoor unit is factory shipped with a different orifice size,
the orifice must be changed to obtain system rated performance.
IMPORTANT: The outdoor unit is shipped with the proper size
orifice and a stick-on orifice size label in an envelope attached to
the outdoor unit. Outdoor unit nameplate will have correct
orifice size specified as BAYFCCV --- A for rated performance.
D. INSTALLING REFRIGERANT LINES
▲ CAUTION:
Ifusingexistingrefrigerant lines
make certain that all joints are brazed, not soldered.
Condensing units have provisions for braze connections.
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.
▲ CAUTION:
In scroll compressor applica-
tions, 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 connecting line. Unit nameplate
charge is the same.
Final refrigerant charge adjustment is necessary. Use the
Charging Charts in the outdoor 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 willbe very difficultto 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.
E. 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
that follows).
▲ WARNIN
G
:
Extreme caution should be ex-
ercised when opening the Liquid Line Service Valve.
Turn valve stem counterclockwise only until the stem
contacts the rolled edge. (See Figure 4) No torque is
required.
BASEPAN TAB REMOVAL
2
BRAZE TYPE INDOOR END
3

Pub. No. 11-AC11D2-5 PAGE 3
INSTALLER'S GUIDE
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 Ball Service Valve is full open with a 1/4 turn. See
Figure 5.
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.
NOTE: Use care to make sure that no moisture enters
pressure tap port, while wet rag is being used.
NOTE: 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. Use a Dry Nitrogen Purge and Brazing Alloy without flux
whenbrazing the fieldline to thecopperfactory 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 be-
fore attaching hoses for evacuation.
After the brazing operation of refrigerant lines to both the
outdoor and indoor unit 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 HCFC-22 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. With vacuum pump and micron gauge blanked off, open valve
on R-410A cylinder and charge refrigerant lines and indoor coil
with vapor to tank pressure of HCFC-22 supply.
NOTE: DO NOT VENT REFRIGERANT INTO THE
ATMOSPHERE.
8. Close valve on HCFC-22 supply cylinder. Close valves on
manifold gauge set and remove refrigerant charging hoses from
liquid and gas pressure tap ports.
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. 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 state-
ment on page 2. See Figure 4.
LIQUID LINE SERVICE VALVE
4GAS LINE SERVICE VALVE

PAGE 4 Pub. No. 11-AC11D2-5
INSTALLER'S GUIDE
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).
G. COMPRESSOR START UP
After all electrical wiring is complete, SET THE THERMOSTAT
SYSTEMSWITCH IN THE OFF POSITIONSO COMPRESSOR
WILL NOT RUN, and apply power by closing the system main
disconnect switch. This will activate the compressor sump heat
(where used). Do not change the Thermostat System Switch
until power has been applied for one (1) hour. Following this
procedure will prevent potential compressor overload trip at the
initial start-up.
H. 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
in the Service Facts.
I. ELECTRIC HEATERS
Electric heaters, if used, are to be installed in the air handling
device according to the instructions accompanying the air han-
dler and the heaters.
J. START CONTROL
Some models have quick start components which are factory
installed. For models that do not have factory installed start
components, provisions are made for a field installed start kit
accessory. When adding an accessory, follow the instructions
provided with the kit.
K. OUTDOOR THERMOSTAT
An outdoor thermostat TAYSTAT250B may be field installed.
For data, see wiring diagram attached to unit and instruction
sheet packaged with outdoor thermostat.
L. SEACOAST SALT SHIELD
The 2A7A4 & 2A7A5 models are shipped with a black Seacoast
Salt Shield. The 2A7A2 & 2A7A1 units installed within one mile
of salt water, including seacoasts and inland waterways, require
the addition of BAYSEAC001 (Seacoast Kit) at the time of
installation.
IMPORTANT: See Limited Warranty information in Use
and Care Manual.
10. Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE REPLACED to prevent leaks.
Replace valve stem and pressure tap cap finger tight, then
tighten an additional 1/6 turn.
11. The gas valve can now be opened. Open the gas valve by
removing the shut-off valve cap and turning the valve stem
1/4 turn counterclockwise, using 1/4" Open End or Adjustable
wrench. See Figure 5.
12. 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 5.
If refrigerant lines are longer than 15 feet and/or a different size
than recommended, it will be necessary to adjust system
refrigerant charge upon completion of installation. See unit
Service Facts.
F. 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 Control Wiring
CAP 1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
GAS LINE CONNECTION
UNIT SIDE
OF VALVE
CAP
BODY
COOLING
CORE
PRESSURE TAP PORT
GAS LINE BALL SERVICE VALVE
524 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 FT
16 AWG 225 FT.
14 AWG 300 FT.

Pub. No. 11-AC11D2-5 PAGE 5
INSTALLER'S GUIDE
TYPICAL FIELD WIRING DIAGRAMS
PRINTED FROM B152901 P02
PRINTED FROM B152908 P02
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.
PRINTED FROM B152903 P02
NOTE *
*
W2 present only on 2 stage
thermostat and furnace
PRINTED FROM B152907 P03
NOTE
*
*
W2 present only on 2 stage
thermostat and furnace
LEGEND
FACTORY WIRING
FIELD WIRING

PAGE 6 Pub. No. 11-AC11D2-5
INSTALLER'S GUIDE
From Dwg. D152862 Rev. 17
2A7A5, 2A7A4, 2A7A2, & 2A7A1 OUTLINE DRAWING
3
MODELS BASE FIG. A B C D E F G H J K
2A7A1018A 1 3 1045 (25-1/2) 502 (19-3/4) 476 (18-3/4) 5/8 1/4 149 (5-7/8) 19 (3/4) 89 (3-1/2) 16 (5/8) 460 (18-1/8)
2A7A1024A 1 3 1045 (25-1/2) 502 (19-3/4) 476 (18-3/4) 3/4 5/16 149 (5-7/8) 19 (3/4) 89 (3-1/2) 16 (5/8) 460 (18-1/8)
2A7A1030A 2 2 651 (25-5/8) 724 (28-1/2) 651 (25-5/8) 3/4 5/16 127 (5) 57 (2-1/4) 180 (7-1/8) 44 (1-3/4) 457 (18)
2A7A1036A
2A7A1042A 2 2 651 (25-5/8) 724 (28-1/2) 651 (25-5/8) 7/8 3/8 127 (5) 57 (2-1/4) 180 (7-1/8) 44 (1-3/4) 457 (18)
2A7A1048A 2 2 730 (28-3/4) 724 (28-1/2) 651 (25-5/8) 1-1/8 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2A7A1060A 3 1 933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A2018A 2 2 651 (25-5/8) 724 (28-1/2) 651 (25-5/8) 5/8 1/4 127 (5) 57 (2-1/4) 180 (7-1/8) 44 (1-3/4) 457 (18)
2A7A2024A
2A7A2030A 2 2 730 (28-3/4) 724 (28-1/2) 651 (25-5/8) 3/4 5/16 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2A7A2036A
2A7A2042B 2 2 832 (32-3/4) 724 (28-1/2) 651 (25-5/8) 7/8 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2A7A2048A 3 1 933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A2060B 4 1 1045 (41-1/8) 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)
2A7A4018B 3 2 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 5/8 1/4 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A4024B 3 2 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 3/4 5/16 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A4030B 3 1 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 3/4 5/16 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A4036B 3 1 933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 7/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7A4042B 4 1 943 (37-1/8) 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)
2A7A4048B
2A7A4060B 4 1 1045 (41-1/8) 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)
2A7A5024A 4 2 943 (37-1/8) 946 (37-1/4) 870 (34-1/4) 3/4 5/16 143 (5-5/8) 98 (3-7/8) 219 (8-5/8) 89 (3-1/2) 508 (20)
2A7A5030A 4 1 943 (37-1/8) 946 (37-1/4) 870 (34-1/4) 3/4 5/16 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
2A7A5036A
2A7A5042A 4 1 1045 (41-1/8) 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)
2A7A5048A 4 1 1045 (41-1/8) 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)
NOTE: ALL DIMENSIONS
ARE IN MM (INCHES).

Pub. No. 11-AC11D2-5 PAGE 7
INSTALLER'S GUIDE
MOUNTING HOLE LOCATION
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).
NOTE: For model base size,
see table on page 6.
From Dwg. 21D152989 Rev. 1

INSTALLER'S GUIDE
PAGE 8 Pub. No. 11-AC11D2-5
P.I. 1/05
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. ..................................................... [ ]
INDOOR THERMOSTAT
SWITCH SETTING
11
Fan Switch
TO CHECK Off Cool Heat Auto On
COMPONENT OPERATION
Indoor Outdoor Compressor 3 Comp. Furnace
Blower Fan Runs Sump Heat
Runs Runs Heater Comes On
Step
No.
CHECKOUT PROCEDURE WITH MAIN POWER DISCONNECTS CLOSED (ON)
1 Also set thermostat dial to call for cooling or heating as necessary.
2 Check only necessary if heating unit is used for indoor section and wiring has been disturbed during installation of cooling
equipment.
3 When applicable.
1 Sump Heat X X X
2 Indoor Fan Operation X X X X
3 Cooling Operation X X X X X X
4 Checking Performance X X X X X X
& Charge USE CHARTS ATTACHED TO O.D. UNIT
5 Heating 2 XX X X X
6 Inform owner on how to operate system and what to expect of it. At the same time deliver Owner’s Use and Care Booklet.
Technical Literature - Printed in U.S.A.
American Standard Inc.
Troup Highway
Tyler, TX 75707-9010