American Standard 4A7A5 Instructions de montage

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

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

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

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.

▲

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

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

▲

If using existing refrigerant lines

make certain that all joints are brazed, not soldered.

Condensing units have provisions for braze connections.

BASEPAN TAB REMOVAL

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

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

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

PSPSS S S S

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

Add 10 psig to Subcool Charging Table Pressure

Use Design Subcool Value from Table

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

(

DESIGN SUBCOOLING (

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.

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