American Standard 4A7A5018 06 Condensing Units User Manual

4A7A5018 06 Condensing Units

11-AC46D1-1B-EN
Installation and Operation Manual Condensing Units
4A7A5018 ­ 060
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES 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 or provide for every possible contingency to be met in connection with the installation. 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. Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. Some of the benefits of installing approved matched indoor and outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.
Table of Contents
Section 1. Safety…………………………………………………………………………. 2 Section 2. Unit Location Considerations ……………………………………… 3 Section 3. Unit Preparation………………………………………………………….. 4 Section 4. Setting the Unit …………………………………………………………… 5 Section 5. Refrigerant Line Considerations………………………………….. 5 Section 6. Refrigerant Line Routing …………………………………………….. 6 Section 7. Refrigerant Line Brazing……………………………………………… 7 Section 8. Refrigerant Line Leak Check ……………………………………….. 9 Section 9. Evacuation …………………………………………………………………. 9 Section 10. Service Valves ………………………………………………………… 10 Section 11. Electrical – Low Voltage …………………………………………… 10 Section 12. Electrical – High Voltage ………………………………………….. 13 Section 13. Start Up…………………………………………………………………… 13 Section 14. System Charge Adjustment……………………………………… 14 Section 15. Checkout Procedures ……………………………………………… 19 Section 16. Refrigeration Circuits………………………………………………..20 Section 17. Wiring Diagrams……………………………………………………….22 Section 18. Pressure Curves……………………………………………………….26

Section 1. Safety
! WARNING
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 manufacture or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.
! WARNING
These units use R-410A refrigerant which operates at 50 to 70% higher pressures than R-22. Use only R-410A approved service equipment. Refrigerant 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 moisture from the atmosphere. To limit this “hygroscopic” action, the system should remain sealed whenever possible. 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 replacement. For specific handling concerns with R-410A and POE oil reference Retrofit Bulletins SS-APG006-EN and APP-APG011-EN.
! WARNING
UNIT CONTAINS R-410A REFRIGERANT! R-410A operating pressures exceed 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 AP-
PROVED POE COMPRESSOR OIL.
! WARNING
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in abrupt release of system charge and may result in personal injury and /or property damage.

! WARNING
LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and troubleshooting of this product, it may be necessary to work with live electrical components. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.
! WARNING
The appliance is not to be used by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction.
! WARNING
Children should be supervised to ensure that they do not play with the appliance.
! CAUTION
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
! CAUTION
Scroll compressor dome temperatures may be hot. Do not touch the top of compressor; it may cause minor to severe burning.
! WARNING
WARNING! This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight

Table 2.1

Unit Dimensions and Weight

Models

H x D x W (in)

Weight* (lb)

4A7A5018N

29 x 30 x 33

161

4A7A5024N

29 x 30 x 33

162

4A7A5030N

37 x 30 x 33

184

4A7A5036N

37 x 34 x 37

212

4A7A5042N

45 x 34 x 37

252

4A7A5048N

45 x 34 x 37

256

4A7A5060N

45 x 34 x 37

252

• Weight values are estimated.

When mounting the outdoor unit on a roof, be sure the roof will support the unit’s weight.
Properly selected isolation is recommended to alleviate sound or vibration transmission to the building structure.

2.2 Refrigerant Piping Limits
1. The maximum TOTAL length of refrigerant lines from outdoor to indoor unit should NOT exceed 150 feet (including lift).
2. The maximum vertical change should not exceed 50 feet.
3. Service valve connection diameters are shown in Table 5.1.
Note: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping Software Program, 323312-03 (or latest revision).

W
H
D
Standard Line Set 150′ Max TOTAL Line Length
50′ Max Vertical Change

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50′ Max Vertical Change
3

2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for at least five (5) feet above the unit.
Three (3) feet clearance must be provided in front of the control box (access panels) and any other side requiring service.
Do not locate close to bedrooms as operational sounds may be objectionable.
Position the outdoor unit a minimum of 12″ from any wall or surrounding shrubbery to ensure adequate airflow.
Outdoor unit location must be far enough away from any structure to prevent excess roof runoff water from pouring directly on the unit.

Avoid Install Near Bedrooms
Min. 12″ to Shrubbery

Min 5′ Unrestricted
Min 3′ Unrestricted
Access Panel

Min. 12″ to Shrubbery

Min. 12″ to Wall

2.4 Coastal Considerations If installed within one mile of salt water, including seacoasts and inland waterways, models without factory supplied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time.
Section 3. Unit Preparation
3.1 Prepare The Unit For Installation
STEP 1 – Check for damage and report promptly to the carrier any damage found to the unit.
STEP 2 – To remove the unit from the pallet, remove tabs by cutting with a sharptool.

4

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Section 4. Setting the Unit
4.1 Pad Installation
When installing the unit on a support pad, such as a concrete slab, consider the following:
· The pad should be at least 1″ larger than the unit on all sides.
· The pad must be separate from any structure. · The pad must be level. · The pad should be high enough above grade
to allow for drainage. · The pad location must comply with National,
State, and Local codes.

Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes

Model
4A7A5018N 4A7A5024N 4A7A5030N 4A7A5036N 4A7A5042N 4A7A5048N 4A7A5060N

Table 5.1

Line Sizes

Vapor Liquid Line Line

3/4

3/8

3/4

3/8

3/4

3/8

7/8

3/8

7/8

3/8

7/8

3/8

1-1/8

3/8

Service Valve Connection Sizes

Vapor Line Connection

Liquid Line Connection

3/4

3/8

3/4

3/8

3/4

3/8

3/4

3/8

7/8

3/8

7/8

3/8

7/8

3/8

5.2 Factory Charge
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Always verify proper system charge via subcooling (TXV/EEV) or superheat (fixed orifice) per the unit nameplate.
5.3 Required Refrigerant Line Length
Determine required line length and lift. You will need this later in STEP 2 of Section 14.

Total Line Length = __ Ft. Total Vertical Change (lift) = __ Ft. 11-AC46D1-1B-EN

Line Length 5

5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be insulated. DO NOT allow the Liquid Line and Vapor Line to come in direct (metal to metal) contact.

Liquid Line

Vapor Line Insulation

5.5 Reuse Existing Refrigerant Lines
! CAUTION
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
For retrofit applications, where the existing indoor evaporator coil and/or refrigerant lines will be used, the following precautions should be taken: · Ensure that the indoor evaporator coil and
refrigerant lines are the correct size.

· Ensure that the refrigerant lines are free of leaks, acid, and oil.

Section 6. Refrigerant Line Routing
6.1 Precautions

Important: Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines.

Comply with National, State, and Local Codes when isolating line sets from joists, rafters, walls, or other structural elements.

For Example: · When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers. · Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings. · Where the refrigerant lines run through a wall or sill, they should be insulated and isolated. · Isolate the lines from all ductwork. · Minimize the number of 90º turns.

8 Feet Maximum

Joist/Rafter

Isolator

Side View

8 Feet Maximum Secure Vapor line from joists using isolators every 8 ft. Secure Liquid Line directly to Vapor line using tape, wire, or other appropriate method every 8 ft.
Isolation From Joist/Rafter

Line Set

6

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8 Feet Maximum

Side View

8 Feet Maximum Secure Vapor Line using isolators every 8 ft. Secure Liquid Line directly to Vapor Line using tape, wire, or other appropriate method every 8 ft.
Isolation In Wall Spaces

Wall Isolator
Line Set

Wall

Sealant Insulation Vapor Line

Isolation Through Wall
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines STEP 1 – Remove caps or plugs. Use a deburing tool to debur the pipe ends. Clean both internal and external surfaces of the tubing using an emery cloth.

Ductwork
Isolator Line Set DO NOT hang line sets from ductwork

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7

STEP 2 – Remove the pressure tap cap and valve cores from both service valves.
STEP 3 – Purge the refrigerant lines and indoor coil with dry nitrogen.
STEP 4 – Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge. Braze the refrigerant lines to the service valves. For units shipped with a field-installed external drier, check liquid line filter drier’s directional flow arrow to confirm correct direction of refrigeration flow (away from outdoor unit and toward evaporator coil) as illustrated. Braze the filter drier to the Liquid Line. Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed. Important: Remove the wet rag before stopping the dry nitrogen purge. Note: Install drier in Liquid Line. 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.
8

3-4″ from valve
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STEP 5 – Replace the pressure tap valve cores after the service valves have cooled.

Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks STEP 1 – Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen.
STEP 2 – Check for leaks by using a soapy solution or bubbles at each brazed location. Remove nitrogen pressure and repair any leaks before continuing.
Section 9. Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil Important: Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are complete. STEP 1 – Evacuate until the micron gauge reads no higher than 350 microns, then close off the valve to the vacuum pump.
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150 PSIG
0350
Microns ON OFF
9

STEP 2 – Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns in one (1) minute.
Once evacuation is complete blank off the vacuum pump and micron gauge, and close the valves on the manifold gauge set.
Section 10. Service Valves
10.1 Open the Gas Service Valve Important: Leak check and evacuation must be completed before opening the service valves.
NOTE: Do not vent refrigerant gases into the atmosphere
STEP 1 – Remove valve stem cap.
STEP 2 – Using an adjustable wrench, turn valve stem 1/4 turn counterclockwise to the fully open position.
STEP 3 – Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
10.1 Open the Liquid Service Valve
! WARNING
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in abrupt release of system charge and may result in personal injury and /or property damage.
Important: Leak check and evacuation must be completed before opening the service valves.
STEP 1 – Remove service valve cap. STEP 2 – Fully insert 3/16″ hex wrench into the stem and back out counterclockwise until valve stem just touches the rolled edge (approximately five (5) turns.) STEP 3 – Replace the valve cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
Section 11. Electrical – Low Voltage
11.1 Low Voltage Maximum Wire Length
Table 11.1 defines the maximum total length of low voltage wiring from the outdoor unit, to the indoor unit, and to the thermostat.
10

1 MIN.

CAP
UNIT SIDE OF VALVE

1/4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN POSITION
VALVE STEM

PRESSURE TAP PORT GAS LINE CONNECTION

Cap
Unit Side of Service
Valve

3/16″ Hex Wrench
Rolled Edge to Captivate Stem
Hex Headed Valve System

Service Port

Table 11.1

24 VOLTS

WIRE SIZE

MAX. WIRE LENGTH

18 AWG

150 Ft.

16 AWG

225 Ft.

14 AWG

300 Ft.

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11.2 Low Voltage Hook-up Diagrams

With TEM 3, 4, 6, 8

Thermostat

Air Handler

Outdoor Unit

R 24 VAC HOT

R

With TAM 4, 7, 9

Thermostat

Air Handler

Outdoor Unit

R 24 VAC HOT

R

FAN

G

24 VAC Common

B/C

SOV
Y COOL/HEAT
1st STAGE

W1 HEATING
2nd STAGE
W2 EMERGENCY
HEAT
BK
WH/BLK

G

**

B

B

Blue

O

Y1

Y

Y2*
W1
White
W2
Pink
BK
WH/BLK

FAN

G

24 VAC Common

B/C

SOV

Y COOL/HEAT

1st STAGE

l

W1 HEATING
2nd STAGE
W2 EMERGENCY
HEAT
BK
WH/BLK

G
B
Blue
O
Yl YO W1
White
W2
Pink
BK
WH/BLK

B YO

· Units with pigtails require wirenuts for connections. Cap all unused wires. · In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat. · TEM3/4 – Bypass air handler and connect Y from comfort control directly to OD unit * TEM6 Only ** TEM6 only – When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handler. Connect BK from comfort control to BK of the air handler · TAM4 only – Wire as shown, no BK is available · TAM7 only – When using a BK enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of the air handler

With Furnace

Thermostat

Furnace

R 24 VAC HOT

R

Outdoor Unit

With Variable Speed Furnace

Thermostat

Furnace

Outdoor Unit

R 24 VAC HOT

R

FAN

G

G

24 VAC Common

B/C

B

B

COOL

Y1

Y

Y

HEATING

W1

W1

FAN

G

G

24 VAC Common

B/C

B

B

O

COOL

Y1

Y

Y

**

YLO

HEATING

W1

W1

• W2

W2

• W2

W2

BK

BK

**

· Units with pigtails require wirenuts for connections. Cap all unused wires. · In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat. * If equipped with second stage heat ** When using a BK enabled comfort control, cut BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control to BK of the furnace

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11

2 Stage AC Thermostat

AUX 1 AUX 2 24VAC HOT COMMON SOV COOLING FAN HEATING
ODT RS

AUX 1 AUX 1 AUX 2 AUX 2
RC RH B/C O Y1 Y2 G BK W1 W2 W3 ODT ODT RS1 RS1

INDOOR UNIT
R

OUTDOOR UNIT

B/C

B

O

Y1/YIo

Y

Y/Y2

G

BK

W1 W2

12

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Section 12. Electrical – High Voltage
12.1 High Voltage Power Supply ! WARNING
LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and troubleshooting of this product, it may be necessary to work with live electrical components. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. The high voltage power supply must agree with the equipment nameplate. Power wiring must comply with national, state, and local codes. Follow instructions on unit wiring diagram located on the inside of the control box cover and in the Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch Install a separate disconnect switch at the outdoor unit. For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may create a noise problem within the structure.
12.3 High Voltage Ground Ground the outdoor unit per national, state, and local code requirements.
Section 13. Start Up
13.1 System Start Up STEP 1 – Ensure Sections 7 through 12 have been completed.
STEP 2 – Set System Thermostat to OFF.
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OFF

DONE

CANCEL

13

STEP 3 – Turn on disconnect(s) to apply power to the indoor and outdoor units.
STEP 4 – Wait one (1) hour before starting the unit if compressor crankcase heater accessory is used and the Outdoor Ambient is below 70ºF.

ON OFF
60 MIN.

STEP 5 – Set system thermostat to ON.

ON

DONE

CANCEL

Section 14. System Charge Adjustment
14.1 Temperature Measurements (Systems can be rated with TXV, EEV or Piston. Ensure charging method is correct).

STEP 1 – Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended* method of charging above 55º F ambient outdoor temperature.

120º F 55º F

Note: For Superheat (In Cooling Mode), refer to the Superheat Charging Table on pg 18.
*Weigh-In Method can be used for initial installation, or system replacement when power is not available or when the desired temperatures for the standard charging method are outside normal bounds. See Section 14.3.

Outdoor Temp

For best results the indoor temperature should be kept between 70º F to 80º F.
Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode when outdoor ambient temperature is above 55º F.

80º F 70º F
Indoor Temp

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14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
STEP 1 – Use the refrigerant line total length and lift measurements from Section 5.3.

Total Line Length = __ Ft.

Vertical Change (Lift) = __ Ft.

LIFT

STEP 2 – Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.

018 Units

024 Units

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

Add 1° Use Design Subcooling

Add 1°

4° Add 2° 1° 1°
Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° Add 1°
Use Design Subcooling

Add 2° Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

030 Units

036 Units

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° Add 1°

Add 2°

Add 1°

Use Design Subcooling

1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

042 Units

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

4°

Add 1°

Add 2°

Add 1°

Use Design Subcooling

1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

048 Units

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

Add 1° Add 1°
Use Design Subcooling

Add 4° Add 2°
Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

060 Units

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° 1°
Use Design Subcooling

Add 1°

Add 4° Add 2°
Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

REFRIGERANT LINE LIFT (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° 1°
Use Design Subcooling

Add 4°
Add 2° Add 1°

Add 1° 1°
30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) – [ includes lift ]

Design Subcooling Value = __º F
(from nameplate or Service Facts)

Subcooling Correction = __º F

Final Subcooling Value = __º F

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15

STEP 3 – Stabilize the system by operating for a minimum of 20 minutes. At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes to stabilize before accurate measurements can be made.
STEP 4 – Measure the liquid line temperature and pressure at the outdoor unit’s service valve. Measured Liquid Line Temp = __ º F Liquid Gage Pressure = __ PSI Final Subcooling Value = __ º F

20 MIN.
107 °F

STEP 5 – Use the final subcooling value, refrigerant temperature and pressure from STEP 4, to determine the proper liquid gage pressure using Table 14.2.
Example: Assume a 12º F Final Subcooling value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2. 2. Locate the Liquid Temperarature (90º F) in the left column. 3. The Liquid Gage Pressure should be approximately 327 PSI. (This is the shown as the intersection of the Final Subcooling column and the Liquid Temperature row.
16

Table 14.2

R-410A REFRIGERANT CHARGING CHART

LIQUID
TEMP
(°F)

FINAL SUBCOOLING (°F)
8 9 10 11 12 13 14
LIQUID GAGE PRESSURE (PSI)

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
From Dwg. D154557P01 Rev. 3

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STEP 6 – Adjust refrigerant level to attain proper gage pressure. Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1. Connect gages to refrigerant bottle and unit as illustrated.
2. Purge all hoses. 3. Open bottle. 4. Stop adding refrigerant when liquid
line temperature and Liquid Gage Pressure matches the charging chart Final Subcooling value. Recover refrigerant if the Liquid Gage Pressure is higher than the chart value.
STEP 7 – Stabilize the system. 1. Wait 20 minutes for the system condition to stabilize between adjustments.
Note: When the Liquid Line Temperature and Gage Pressure approximately match the chart, the system is properly charged.
2. Remove gages. 3. Replace service port caps to prevent
leaks. Tighten finger tight plus an additional 1/6 turn.
STEP 8 – Verify typical performance.
Refer to System Pressure Curves at the end of the document to verify typical performance.
STEP 9 – Record System Information for reference
Record system pressures and temperatures after charging is complete. Outdoor model number = _____ Measured Outdoor Ambient = __ º F Measured Indoor Ambient = __ º F
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20 MIN.

DISCHARGE PRESSURE (PSIG)

PRESSURE CURVE SAMPLE

Cooling @ 1450 SCFM

Heating @ 1350 SCFM

550 INDOOR ENTERING WET BULB CURVES
500 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
450

400

350 (4)

(3)

300

250

(1) 200

40

60

80

100

(2) 120

500 INDOOR ENTERING DRY BULB CURVES
450 TOP TO BOTTOM 80, 70, AND 60 DEG F.
400

350

300

250

200

-5

5

15 25 35 45 55 65

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING
165 WET BULB CURVES TOP TO BOTTOM
160 71, 67, 63 AND 59 DEG F.
155

150

145 (5) 140

(3)

135

130

125

120

115

(1)

110

40

60

80

100

(2) 120

140 INDOOR ENTERING
130 DRY BULB CURVES TOP TO BOTTOM
120 80, 70, AND 60 DEG F.
110

100

90

80

70

60

50

40

30

-5

5

15 25 35 45 55 65

SUCTION PRESSURE (PSIG)

Measured Liquid Line Temp = __ º F Measured Suction Line Temp = __ º F Liquid Gage Pressure = __ PSI Suction Gage Pressure = __ PSI

17

Fixed Orifice Superheat Charging Table

Indoor Wet Bulb Temp (F)

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78

55 7 9 10 11 12 14 15 17 18 20 21 23 24 26 27 29 30

60 5 7 8 9 10 12 13 15 16 18 19 21 22 24 25 27 28 30 31

65

4 6 8 10 11 13 14 16 17 18 19 21 22 24 25 27 28 27 31

70

5 7 8 10 11 13 14 16 17 18 19 21 22 24 25 27 28 30 31

75
Outdoor

Dry

80

Bulb 85 Temp.

(F)

90

95

5 6 7 9 10 12 14 16 18 19 21 22 24 26 28 29 31 32 4 6 7 9 10 11 12 14 16 18 19 21 23 25 26 28 29 31 33 4 6 7 9 10 13 14 16 18 20 21 23 24 26 28 29 30 31 32 4 6 8 10 11 13 14 16 18 20 22 24 25 27 28 30 31 4 6 8 10 13 14 16 18 20 22 23 25 26 28 29

100

6 8 10 12 13 16 18 20 21 23 25 27 29

105

4 6 7 9 11 13 15 18 20 22 24 26 28

110

4 7 9 11 13 16 18 21 23 26 28

115

6 9 12 14 16 19 21 24 26

Using a digital psychrometer, measure the return air wet-bulb temperature at the unit just before the coil. Also measure the outdoor dry-bulb temperature. Use these temperatures to locate the target superheat on the charging table. Do not attempt to charge the system if these conditions fall outside of this charging table. ADD refrigerant to DECREASE total superheat. REMOVE refrigerant to INCREASE total superheat. Always allow 10 to 15 minutes of operature after any refrigerant or air flow change prior to determining the final superheat.

14.3 Weigh-In Method for Charging
Weigh-In Method can be used for the initial installation, or anytime a system charge is being replaced. Weigh-In Method can also be used when power is not available to the equipment site or operating conditions (indoor/outdoor temperatures) are not in range to verify with the subcooling charging method.

Calculating Charge Using the Weigh-In Method STEP 1 – Measure in feet the distance between the outdoor unit and the indoor unit and record on Line 1. Include the entire length of the line from the service valve to the IDU.
STEP 2 – Enter the charge multiplier (0.6 oz/ft). Each linear foot of interconnecting tubing requires the addition of 0.6 oz of refrigerant.
STEP 3 – Multiply the total length of refrigerant tubing (Line 1) times the value on Step 2. Record the result on Line 3 of the Worksheet.
STEP 4 – This is the amount of refrigerant to weigh-in prior to opening the service valves.

1. Line length (ft) 2. Charge multiplier 3. Step 1 x Step 2 4. Refrigerant

__ x 0.6 __ = =

18

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Section 15. Checkout Procedures
15.1 Operational And Checkout Procedures

Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units must be operated and charge adjustments made.
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 properly secured.
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:

1. Leak check refrigerant lines. …………………………………. [ ] 2. Properly insulate suction lines and fittings……………….. [ ] 3. Properly secure and isolate all refrigerant lines………… [ ] 4. Seal passages through masonry. If mortar is used, prevent mortar from coming into direct contact with copper tubing. …………………….. [ ] 5. Verify that all electrical connections are tight……………. [ ] 6. Observe outdoor fan during on cycle for clearance and smooth operation…………………………………………… [ ]

7. Be sure that indoor coil drain line drains freely. Pour water into drain pan………………………………………………………. [ ] 8. Be sure that supply registers and return grilles are open and unobstructed…………………………………………………. [ ] 9. Be sure that a return air filter is installed…………………. [ ] 10. Be sure that the correct airflow setting is used. (Indoor blower motor) …………………………………………… [ ] 11. Operate complete system in each mode to ensure safe operation…………………………………………… [ ]

11-AC46D1-1B-EN

19

Section 16. Refrigeration Circuits
5018 & 5024 Models

PRINTED FROM D157394P01
5030 & 5036 Models

PRINTED FROM D158514P01

20

11-AC46D1-1B-EN

5042 & 5048 Models

5060 Models

Printed from D157878

11-AC46D1-1B-EN

Printed from D159175 21

Section 17. Wiring Diagrams
4A7A5018 – 048 Models

22

11-AC46D1-1B-EN

4A7A5018 – 048 Models

11-AC46D1-1B-EN

23

4A7A5060 Models

24

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4A7A5060 Models

11-AC46D1-1B-EN

25

Section 18. Pressure Curves
PRESSURE CURVES (Refer below table for models)

LIQUID PRESSURE (PSIG)

520 INDOOR ENTERING

WET BULB CURVES

470 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

(2)

420

370

320

(4)

(3)

270

220

(1)
170

40

50

60

70

80

90

100

110

120

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING
165 WET BULB CURVES
160 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
155

150

145
140 (5)

135

130

125

120

115

110

40

50

60

70

(3)

(1)

80

90

71
67 (2)
63 59

100

110

120

OD Model Cooling @SCFM
4A7A5018N1 600

SUCTION PRESSURE (PSIG)

OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F. TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .

EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION (4) LIQUID PRESSURE @ 600 CFM IS 286 PSIG (5) SUCTION PRESSURE @ 600 CFM IS 143 PSIG

ACTUAL: LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

26

11-AC46D1-1B-EN

PRESSURE CURVES (Refer below table for models)

LIQUID PRESSURE (PSIG)

520 INDOOR ENTERING

WET BULB CURVES 470 TOP TO BOTTOM

(2)

71, 67, 63 AND 59 DEG F.

420

370

320 (4)

(3)

270

220

(1)
170

40

50

60

70

80

90

100

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING
165 WET BULB CURVES
160 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
155

150

145

(3)

140 (5)

135

130

125

120

115

110

(1)

40

50

60

70

80

90

100

110

120

71
67 (2)
63 59

110

120

OD Model
4A7A5024N1 4A7A5030N1 4A7A5036N1 4A7A5042N1 4A7A5048N1

Cooling @SCFM
800 800 950 1250 1400

SUCTION PRESSURE (PSIG)

OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F. TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .

EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION (4) LIQUID PRESSURE @ 600 CFM IS 300 PSIG (5) SUCTION PRESSURE @ 600 CFM IS 143 PSIG

ACTUAL: LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

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27

PRESSURE CURVES (Refer below table for models)

LIQUID PRESSURE (PSIG)

520

INDOOR ENTERING WET BULB CURVES

(2)

470 TOP TO BOTTOM

71, 67, 63 AND 59 DEG F.

420

370

320 (4)

(3)

270

220

(1)
170

40

50

60

70

80

90

100

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING
165 WET BULB CURVES
160 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
155

150

145

140

135 (5)

(3)

130

125

120

115

110

(1)

40

50

60

70

80

90

100

110

120

71
67 (2)
63 59

110

120

OD Model 4A7A5060N1

Cooling @SCFM
1450

SUCTION PRESSURE (PSIG)

OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F. TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .

EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION (4) LIQUID PRESSURE @ 600 CFM IS 313 PSIG (5) SUCTION PRESSURE @ 600 CFM IS 134 PSIG

ACTUAL: LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

About American Standard Heating and Air Conditioning American Standard has been creating comfortable and affordable living environments for more than a century. For more information, please visit www.americanstandardair.com.
11-AC46D1-1B-EN 05 Jul 2022 Supersedes 11-AC46D1-1A-EN (April 2022)

The AHRI Certified mark indicates company participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org.
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.
© 2022 American Standard Heating and Air Conditioning

References

• American Standard® | Air Conditioning and Heating | HVAC Systems
• P65Warnings.ca.gov

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