American Standard 2A7C3000A 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-AC19D1-1
Theseinstructionsdonotcoverallvariationsinsystemsnor
provideforeverypossible contingencytobemet inconnec-
tion with installation. All phases of this installation must
comply with NATIONAL, STATE AND LOCAL CODES.
Should further information be desired or should particular prob-
lems 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
▲ WARNING:
This information is intended
foruseby individualspossessingadequatebackgrounds 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-
tureror seller cannotbe responsibleforthe interpretation
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.
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 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
wallorsurrounding shrubberytoinsureadequate airflow. Clear-
ancemustbe provided infrontof control box(accesspanels) & any
other side requiring service access to meet National Electrical
Code. Also, the unit location must be far enough away from any
structuretopreventexcessroofrun-offwaterfrompouringdirectly
on the unit. When choosing the location of the unit(s), sound
transmission through air and 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. Thetopdischarge area mustbeunrestrictedforatleast five (5)
feet above the unit.
5. Whentheoutdoorunitismountedonaroof,besuretheroofwill
support the unit’s weight. Properly selected isolation is recom-
mended 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. Ifoutdoorunitismounted above theairhandler,maximumlift
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).
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: 2A7C3030-060A3/4000A
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.

PAGE 2 Pub.No. 11-AC19D1-1
INSTALLER'S GUIDE
8. Locateandinstallindoor coil orairhandler in accordancewith
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).
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.
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 com-
pressor, 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 name-
plate charge is the same.
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 vibra-
tiontransmissionfromtherefrigerant lines, thefollowingprecau-
tions should be taken:
a. Whentherefrigerantlineshaveto be fastenedtofloorjoists
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 ex-
ercised 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
torque is required.
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.
TheGasLineServiceValveisfullopenwitha1/4turn.SeeFigure 4.
BRAZING REFRIGERANT LINES
1. Remove lower access cover to access service valves.
2. Beforebrazing,remove plugs fromexternalcopperstub 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.
BASEPANTAB REMOVAL
2
3LIQUID LINE SERVICE VALVE

Pub.No. 11-AC19D1-1 PAGE 3
INSTALLER'S GUIDE
SYSTEM EVACUATION
NOTE: Sincetheoutdoorunithasarefrigerantcharge,thegas 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:Unnecessaryswitchingofhosescanbeavoidedandcomplete
evacuationofalllinesleadingtosealedsystemcanbeaccomplished
withmanifoldcenterhoseandconnectingbranch hose to acylinder
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. Closeoffvalve to vacuumpumpandobserve themicrongauge.
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 HCFC-22 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: A3/16"Allenwrench is requiredtoopenliquidline service
valve. A1/4"OpenEndorAdjustablewrenchisrequiredtoopengas
linevalve. A3/4"Open End wrenchisrequiredto take offthevalve
stem cap.
9. The liquid line shut-off valve can now be opened. Remove
shut-offvalvecap. Fullyinsert hexwrenchintothe stem andback
out counterclockwise until valve stem just touches rolled edge
(approximately five [5] turns) observing WARNING statement
on page 2. See Figure 3.
5. DoNOTallowuninsulated liquidlinetocome in directcontact
with bare gas line.
6. Precautionsshould be takentoavoidheatdamageto the
pressuretapvalve coreduringbrazing. It isrecommended
thatthe pressuretap portvalve corebe removedand awet
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.
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. UseaDryNitrogenPurgeandBrazingAlloywithoutfluxwhen
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.
Afterthebrazingoperation of refrigerantlinestoboth the outdoor
and indoor unit is completed, the field brazed connections 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!
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
HEATING
GAS LINE BALL SERVICE VALVE
45
GAS LINE SERVICE VALVE

PAGE 4 Pub.No. 11-AC19D1-1
INSTALLER'S GUIDE
10. Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE REPLACED to prevent leaks.
Replacevalvestemand pressure tapcapfingertight, then tighten
an additional 1/6 turn.
11. The gas valve can now be opened. For a ball type gas valve,
openthegas valvebyremoving theshut-offvalve cap andturning
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 9 and 10 above. 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 4.
If refrigerant lines are longer than 15 feet and/or a different size
than recommended, it will be necessary to adjust system refriger-
ant charge upon completion of installation. See page 6 and unit
Service Facts.
E. ELECTRICAL CONNECTIONS
▲ WARNIN
G
:
Wheninstallingorservicingthis
equipment, ALWAYS exercise basic safety precautions 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
ing the change in delta-T, we can determine the need for defrost.
The coil sensor also serves to sense outdoor coil temperature for
termination of the defrost cycle.
FAULT IDENTIFICATION
A fault condition is indicated by the flashing light on the defrost
control inside the heat pump control box.
In normal operation, the defrost control light will flash once each
second. If the light is flashing more than once per second or not at
all, refer to the service manual for that unit.
PIN IDENTIFICATION (See Figure 6)
1. TEST_COMMON (Shorting any of the other pins to this pin
causes the function of the other pin to be executed. Leaving this
pin open results in the normal mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin speeds up
all defrost board timings.)
3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this
pin for two (2) seconds to initiate a forced defrost. Remove the
short after defrost initiates.)
DEFROST CONTROL CHECKOUT
Normal operation requires:
a LED on board flashing 1 time/second.
b. 24V AC between R & B.
c. 24V AC between Y & B with unit operating.
d. Defrost initiation when FRC_DFT pin is shorted to
TEST_COMMON pin.
If a defrost control problem is suspected, refer to the service
information in control box.
▲ WARNIN
G
:
Do NOT connect 24 VAC to T1
(ODS-A) terminal. ODS-A thermistor WILL BE BLOWN.
G. COMPRESSOR START-UP
After all electrical wiring is complete, SET THE THERMOSTAT
SYSTEMSWITCH IN THEOFF POSITION SO COMPRESSOR
WILL NOT RUN, and apply power by closing the system main
disconnect switch. This will activate the compressor sump heat
(whereused). Donot change theThermostatSystem Switchuntil
power has been applied for one (1) hour. Following this procedure
will prevent potential compressor overload trip at the initial
start-up.
FRC_DFT
TEST_COMMON
TST
6PINIDENTIFICATION
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. DEFROST CONTROL
The demand defrost control measures heat pump outdoor ambi-
ent temperature with a sensor located outside the outdoor coil. A
second sensor located on the outdoor coil is used to measure the
coil temperature. The difference between the ambient and the
coldercoiltemperature isthedifference ordelta-Tmeasurement.
This delta-T measurement is representative of the operating
state and relative capacity of the heat pump system. By measur-

Pub.No. 11-AC19D1-1 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.
6. N/A to programmable thermostat.
LEGEND
FACTORY WIRING
FIELD WIRING
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 on page 6 and in the Service Facts.
I. ELECTRIC HEATERS
Electric heaters, if used, are to be installed in the air handling
deviceaccordingtotheinstructions accompanying theairhandler
and the heaters.
J. 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.
K. SEACOAST SALT SHIELD
BAYSEAC001 (Seacoast Kit) is available for application on units
installed within one mile of salt water, including seacoasts and
inland waterways.
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
L. TROUBLESHOOTING

PAGE 6 Pub.No. 11-AC19D1-1
INSTALLER'S GUIDE
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
R-22 SUBCOOLING CHARGING TABLE
LIQUID
TEMP.
(°F)
DESIGN SUBCOOLING VALUES (°F)
8101214
LIQUID LINE PRESSURE (psi)
45 89 93 96 100
50 98 102 105 109
55 107 111 115 119
60 117 121 126 130
65 128 132 137 141
70 139 144 148 153
75 151 156 161 166
80 163 168 174 179
85 176 182 187 193
90 190 196 202 208
95 205 211 217 223
100 220 226 233 239
105 236 243 249 256
110 253 260 267 274
115 271 278 285 293
120 289 297 305 313
125 309 317 325 333
AmericanStandard has always recommended installingAmerican
Standard approved matched indoor and outdoor systems.
All 13 SEER American Standard split systems are ARI rated
with only TXV indoor systems.
The benefits of installing approved indoor and outdoor split
systems are maximum efficiency, optimum performance and the
best overall system reliability.
The following charging methods are therefore prescribed for
systems with indoor 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 20 minutes to
stabilize before accurate measurements can be made.
4. MeasureLiquidLineTemperature and RefrigerantPressure
at service valves.
5. Determine total refrigerant line length, and height (lift) if
indoor section is above the condenser.
6. Determine the Design Subcool Charging Temperature from
the unit nameplate.
7. Locatethisvaluein theappropriatecolumnof the Subcooling
Charging Table. Locate your liquid line temperature in the
left column of the table, and the intersecting liquid line
pressure under your nameplate subcool value column. Add
refrigeranttoraisethepressure to matchthetable,orremove
refrigerant to lower the pressure. Again, wait 20 minutes for
the system conditions to stabilize before adjusting charge
again.
8. When system is correctly charged, you can refer to System
Pressure Curves (in Service Facts) to verify typical performance.
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE
60
50
40
30
25 Add 5 psig to Subcool Charging Table Pressure
20
15 Use Design Subcool Value from Table
10
0Subtract 5 psig from S.C. Table Pressure
10 20 25 30 40 60 80
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)

Pub.No. 11-AC19D1-1 PAGE 7
INSTALLER'S GUIDE
From Dwg. 21D153074 Rev. 10
2A7C3 OUTLINE DRAWING
NOTE: ALL DIMENSIONS ARE IN MM (INCHES).
MODELS BASE FIG. A B C D E F G H J K
2A7C3030A 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)
2A7C3036A 3 2 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 7/8 3/8 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2A7C3042A 4 1 841 (33-1/8) 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)
2A7C3048A 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)
2A7C3060A 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)

Pub.No. 11-AC19D1-1
P.I. 9/05
INSTALLER'S GUIDE
Technical Literature - Printed in U.S.A.
American Standard Inc.
Troup Highway
Tyler, TX 75707-9010
MOUNTING HOLE LOCATION Note: All Dimensions Are In MM (Inches).
NOTE:
For model base size,
see table on page 7.
From Dwg. 21D152989 Rev. 0
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. ................................. [ ]