American Standard 2A7A1018A Istruzioni per il montaggio

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

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

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

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

BRAZE TYPE INDOOR END

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

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

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

Fan Switch

TO CHECK Off Cool Heat Auto On

COMPONENT OPERATION

Indoor Outdoor Compressor

Comp. Furnace

Blower Fan Runs Sump Heat

Runs Runs Heater Comes On

Step

No.

CHECKOUT PROCEDURE WITH MAIN POWER DISCONNECTS CLOSED (ON)

Also set thermostat dial to call for cooling or heating as necessary.

Check only necessary if heating unit is used for indoor section and wiring has been disturbed during installation of cooling

equipment.

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

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

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