American Standard INSTALLER'

11-AC29D1-8-EN
Installer’s Guide
Condensing Units
4A7A3
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. All of the manufacture’s split
systems are AHRI rated only with TXV/EEV indoor 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..................................................................... 5
Section 4. Setting the Unit...................................................................... 5
Section 5. Refrigerant Line Considerations.......................................... 6
Section 6. Refrigerant Line Routing...................................................... 8
Section 7. Refrigerant Line Brazing....................................................... 8
Section 8. Refrigerant Line Leak Check.............................................. 10
Section 9. Evacuation............................................................................ 12
Section 10. Service Valves.................................................................... 12
Section 11. Electrical - Low Voltage..................................................... 13
Section 12. Electrical - High Voltage.................................................... 15
Section 13. Start Up............................................................................... 16
Section 14. System Charge Adjustment.............................................. 17
Section 15. Checkout Procedures and Troubleshooting.................... 22
Section 16. Refrigerant Circuits........................................................... 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 or
APP-APG012-EN.
▲! 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.
▲! 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
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 APPROVED 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.
211-AC29D1-8-EN
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
Table 2.1
W
Unit Dimensions and Weight
Models
H x D x W (in)
Weight* (lb)
4A7A3018H
29 x 26 x 29
133
4A7A3024H
29 x 26 x 29
130
4A7A3030H
29 x 26 x 29
137
4A7A3036H
29 x 30 x 33
147
4A7A3042E
29 x 30 x 33
172
4A7A3048E
37 x 30 x 33
184
4A7A3060D
37 x 34 x 37
226
H
* Weight values are estimated.
When mounting the outdoor unit on a roof, be
sure the roof will support the unit’s weight.
D
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*.
Standard
Line Set
150’ Max
TOTAL Line Length
3. Standard and alternate line sizes and
service valve connection sizes are shown in
Table 5.1.
* See Table 5.1 for exceptions for certain tonnages.
50’
Max
Vertical
Change
Note: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN
or Refrigerant Piping Software Program, 323312-xx (latest revision).
50’
Max
Vertical
Change
11-AC29D1-8-EN
3
2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for
at least five (5) feet above the unit.
Avoid Install
Near Bedrooms
Three (3) feet clearance must be provided in
front of the control box (access panels) and any
other side requiring service.
It is not recommended to install in a location
where noise may distract the building occupants. Some examples of these types of locations are sleeping quarters and by windows of
a living area. Please discuss location with the
building owner prior to installation.
Min 5’ Unrestricted
Min. 12” to
Shrubbery
Min 3’
Unrestricted
Access Panel
Avoid locations such as near windows where
condensation and freezing defrost vapor can
annoy a customer.
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 or icicles from falling directly on the unit.
Min. 12” to
Shrubbery
Min. 12”
to Wall
2.4 Cold Climate Considerations
NOTE: It is recommended that these precautions be taken for units being installed in areas
where snow accumulation and prolonged below
freezing temperatures occur.
• Units should be elevated 3-12 inches above
the pad or roof­top, depending on local
weather. This additional height will allow
drainage of snow and ice melted during
defrost cycle prior to its refreezing. Ensure
that drain holes in unit base pan are not
­obstructed preventing draining of defrost
water.
• If possible, avoid locations that are likely to
accumulate snow drifts. If not possible, a
snow drift barrier should be installed around
the unit to prevent a build-up of snow on the
sides of the unit.
Min. 12”
Snow
Barrier
Snow Legs
3-12” Elevation
Pad
411-AC29D1-8-EN
2.5 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 sharp tool.
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.
For other applications refer to application guide.
11-AC29D1-8-EN
5
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
RATED
LINE SIZES
Line Sizes
Service Valve Connection Sizes
Max Line & Lift Lengths
Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
TOTAL Max
Line Length (ft.)
Max Lift (ft.)
4A7A3018H
3/4
3/8
3/4
3/8
150
50
4A7A3024H
3/4
3/8
3/4
3/8
150
50
4A7A3030H
3/4
3/8
3/4
3/8
150
50
4A7A3036H
3/4
3/8
3/4
3/8
150
50
4A7A3042E
7/8
3/8
7/8
3/8
150
50
4A7A3048E
7/8
3/8
7/8
3/8
150
50
4A7A3060D
7/8
3/8
7/8
3/8
150
50
Note: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping
Software Program, 32-3312-xx (latest revision).
611-AC29D1-8-EN
5.2 Factory Charge
American Standard outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, fifteen (15) feet of tested connecting line, and the smallest indoor evaporative coil match.
If connecting line length exceeds fifteen (15) feet and/or a larger indoor evaporative coil is installed, then
final refrigerant charge adjustment is necessary.
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.
Line Length
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.
11-AC29D1-8-EN
Liquid Line
Vapor Line
Insulation
7
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
Line Set
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
811-AC29D1-8-EN
8 Feet Maximum
Wall
Isolator
8 Feet Maximum
Side View
Line Set
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
Sealant
Ductwork
Insulation
Vapor Line
Isolator
Line Set
Isolation Through Wall
DO NOT hang line sets from ductwork
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.
11-AC29D1-8-EN
9
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.
3-4” from valve
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.
1011-AC29D1-8-EN
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.
150 PSIG
STEP 2 - Check for leaks by using a soapy solution or bubbles at each brazed location.
Remove nitrogren pressure and repair any leaks
before continuing.
11-AC29D1-8-EN
11
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.
0350
Microns
STEP 1 - Evacuate until the micron gauge reads
no higher than 350 microns, then close off the
valve to the vacuum pump.
ON
OFF
STEP 2 - Observe the micron gauge. Evacuation
is complete if the micron gauge does not rise
above 500 microns in one (1) minute.
1 MIN.
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.
CAP
NOTE: Do not vent refrigerant gases into the
atmosphere.
VALVE STEM
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.
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
UNIT SIDE
OF VALVE
PRESSURE TAP PORT
GAS LINE CONNECTION
1211-AC29D1-8-EN
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.
Cap
Unit Side
of Service
Valve
3/16” Hex Wrench
Rolled Edge to
Captivate Stem
Important: Leak check and evacuation must be
completed before opening the service valves.
Hex Headed
Valve System
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.)
Service Port
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.
11-AC29D1-8-EN
Table 11.1
24 VOLTS
WIRE SIZE
MAX. WIRE LENGTH
18 AWG
150 Ft.
16 AWG
225 Ft.
14 AWG
300 Ft.
13
11.2 Low Voltage Hook-up Diagrams
With TEM 3, 4, 6
Thermostat
R
R
FAN
G
G
B/C
Outdoor
Unit
Air Handler
24 VAC HOT
24 VAC
Common
With TAM 4, 7
B
Blue
COOL/HEAT
1st STAGE
Y
Y1
Air Handler
24 VAC HOT
R
R
FAN
G
G
B/C
Blue
**
B
O
SOV
Thermostat
24 VAC
Common
B
COOL/HEAT
1st STAGE
Yl
Yl
Y2*
HEATING
2nd STAGE
EMERGENCY
HEAT
YO
W1
W1
HEATING
2nd STAGE
W1
W1
W2
W2
EMERGENCY
HEAT
W2
W2
BK
WH/BLK
White
Pink
B
O
SOV
Y
Outdoor
Unit
BK
White
Pink
BK
WH/BLK
YO
BK
WH/BLK
WH/BLK
• 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
With Variable Speed Furnace
Outdoor
Unit
Thermostat
Furnace
24 VAC HOT
R
R
24 VAC HOT
R
R
FAN
G
G
FAN
G
G
B/C
B
B/C
B
24 VAC
Common
B
24 VAC
Common
Outdoor
Unit
B
O
COOL
HEATING
Y1
Y
W1
W1
* W2
W2
Y
COOL
HEATING
Y1
**
Y
Y
YLO
W1
W1
* 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
1411-AC29D1-8-EN
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.
11-AC29D1-8-EN
15
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.
OFF
DONE
CANCEL
STEP 3 - Turn on disconnect(s) to apply power
to the indoor and outdoor units.
ON
OFF
STEP 4 - Wait one (1) hour before starting the
unit if compressor crankcase heater accessory is used and the Outdoor Ambient is below
70ºF.
60 MIN.
STEP 5 - Set system thermostat to ON.
ON
DONE
CANCEL
1611-AC29D1-8-EN
Section 14. System Charge Adjustment
14.1 Temperature Measurements
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended method of charging above 55º F ambient outdoor temperature. See Section 14.2.
See Section 14.2 for
Outdoor
Temperatures
Above 55º F
120º F
55º F
Outdoor Temp 1
For outdoor temperatures below 55º F, see Section 14.3.
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.
See Section 14.3 for
Outdoor
Temperatures
Below 55º F
55º F
Outdoor Temp 2
For best results the indoor temperature should
be kept between 70º F to 80º F.
80º F
70º F
Indoor Temp
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
11-AC29D1-8-EN
17
STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 1°
50
4°
Add 1°
40
Add 2°
1°
30
25
1°
Use Design Subcooling
Add 1°
15
10
0
30
40
50
60
70
80
90 100 110 120 130 140 150
Add 1°
40
Add 2°
Add 1°
30
25
Use Design Subcooling
15
10
0
20
30
40
50
60
70
80
90 100 110 120 130 140 150
2.5 Ton Units
3 Ton Units
1°
50
Add 2°
Add 1°
40
Add 1°
30
25
Use Design Subcooling
1°
15
10
0
30
40
50
60
70
80
90 100 110 120 130 140 150
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
4°
50
Add 2°
Add 1°
40
Add 1°
30
25
Use Design Subcooling
1°
15
10
0
20
30
40
50
60
70
80
90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
3.5 Ton Units
4 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 4°
50
Add 1°
40
Add 1°
30
25
Add 2°
Use Design Subcooling
Add 1°
15
10
0
20
1°
50
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
20
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
REFRIGERANT LINE LIFT (FT)
20
REFRIGERANT LINE LIFT (FT)
2 Ton Units
30
40
50
60
70
80
90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
REFRIGERANT LINE LIFT (FT)
REFRIGERANT LINE LIFT (FT)
REFRIGERANT LINE LIFT (FT)
REFRIGERANT LINE LIFT (FT)
1.5 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 4°
1°
50
1°
40
Add 1°
30
25
Add 2°
Use Design Subcooling
Add 1°
15
10
0
20
30
40
50
60
70
80
90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
REFRIGERANT LINE LIFT (FT)
5 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 4°
1°
50
1°
40
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Add 2°
30
25
Use Design Subcooling
Add 1°
Subcooling Correction = __________º F
15
Add 1°
10
1°
0
20
30
40
50
60
70
80
90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Final Subcooling Value = __________º F
1811-AC29D1-8-EN
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.
20 MIN.
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
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.
107 °F
Table 14.2
R-410A REFRIGERANT CHARGING CHART
FINAL SUBCOOLING (°F)
LIQUID
8
9
10 11 12 13 14
TEMP
(°F)
LIQUID GAGE PRESSURE (PSI)
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
179
195
211
229
247
267
287
309
331
355
381
407
435
464
495
182
198
215
232
251
271
291
313
336
360
386
413
441
470
501
185
201
218
236
255
275
296
318
341
365
391
418
446
476
507
188
204
222
240
259
279
300
322
346
370
396
424
452
482
514
191
208
225
243
263
283
304
327
351
376
402
429
458
488
520
195
211
229
247
267
287
309
331
355
381
407
435
464
495
527
198
215
232
251
271
291
313
336
360
386
413
441
470
501
533
From Dwg. D154557P01 Rev. 3
11-AC29D1-8-EN
19
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.
20 MIN.
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 Tables to verify typical
performance.
(Example only - see Pressure Tables)
LIQUID
TEMP
(°F)
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
R-410A REFRIGERANT CHARGING CHART
DESIGN SUBCOOLING (°F)
8
9
179
195
211
229
247
267
287
309
331
355
381
407
435
464
495
182
198
215
232
251
271
291
313
336
360
386
413
441
470
501
10
11
12
13
14
LIQUID GAGE PRESSURE (PSI)
185
201
218
236
255
275
296
318
341
365
391
418
446
476
507
188
204
222
240
259
279
300
322
346
370
396
424
452
482
514
191
208
225
243
263
283
304
327
351
376
402
429
458
488
520
195
211
229
247
267
287
309
331
355
381
407
435
464
495
527
198
215
232
251
271
291
313
336
360
386
413
441
470
501
533
Refer to Service Facts or
Installer's Guide for charging method.
OD 13/14 SEER AC only
OD Temp ID Wet Bulb
110
71
67
63
59
100
71
67
63
59
90
71
67
63
59
80
71
67
63
59
70
71
67
63
59
60
71
67
63
59
OD Temp
115
110
105
100
18
160
154
148
142
156
150
144
138
152
146
140
136
150
144
138
134
148
142
136
130
146
140
134
128
24/25 30/31 36/37 42/43
Suction Pressure
159
156
157
158
152
150
149
150
144
144
142
142
137
138
135
135
155
152
153
154
148
146
145
147
141
140
138
138
134
134
132
131
152
150
149
152
145
144
143
143
138
138
135
136
131
132
129
129
149
148
147
150
142
142
141
141
135
136
133
134
129
130
127
127
147
146
145
147
140
140
138
139
133
134
131
132
126
128
125
125
145
144
143
145
138
138
136
137
131
132
129
130
124
126
123
123
Liquid Pressure
483
480
480
485
453
450
450
455
425
420
420
425
398
390
395
398
48
60
154
148
140
132
152
144
136
130
148
142
134
128
146
138
132
126
144
136
130
124
142
134
128
122
158
148
140
132
154
146
138
130
150
142
134
126
148
140
132
124
146
138
130
122
144
136
128
120
480
450
425
395
505
470
440
415
2011-AC29D1-8-EN
475
445
415
390
STEP 9 - Record System Information for reference.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Suction Line Temp = __________ º F
Measured Outdoor Ambient = __________ º F
Liquid Gage Pressure = __________ PSIG
Measured Indoor Ambient = __________ º F
Suction Gage Pressure = __________ PSIG
Measured Liquid Line Temp = __________ º F
14.3 Subcooling Charging Below 55º F Outdoor Temp.
The Subcooling Charging method in cooling is not recommended below 55º F outdoor temperature.
The recommended method of charging at outdoor temperatures below 55º F is weighing in the charge. Return
when weather conditions permit charge verification through subcooling.
STEP 1 - Determine additional charge.
Note: The nameplate charge value represents
the amount of refrigerant shipped in the outdoor
unit and is compatible with 15 feet of AHRI rated
refrigerant lines and the smallest AHRI rated
coil.
Using the method below, find the charge associated with the additional length of tubing above
15 ft. and record it below.
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
1) Measure in feet the distance between the
outdoor unit and the indoor unit. (Include
the entire length of the line from the service
valve to the IDU.) Subtract 15 ft from this
entire length and record on line 1.
1. Total Line length (ft) –15 ft _______________
2) Enter the charge multiplier (0.6 oz/ft). Each
linear foot of interconnecting tubing requires
the addition of 0.6 oz of refrigerant.
2. Charge multiplier
x ____0.6 oz______
3. Step 1 x Step 2
= ______________
4. Refrigerant (oz)
= ______________
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.
4) This is the amount of refrigerant to weigh-in
prior to opening the service valves.
11-AC29D1-8-EN
21
STEP 2 - Stabilize the system by operating for a
minimum of 20 minutes.
20 MIN.
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 3 - Check the liquid line temperature and
liquid gage pressure to obtain a minimum of 10º
subcooling in heating mode.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
STEP 4 - Add charge if a minimum of 10º subcooling is not obtained with the namplate charge
plus additional charge previously added.
STEP 5 - Return to site for adjustment.
Important: Return in the spring or summer to
accurately charge the system in the cooling
mode with outdoor ambient above 55º F.
Section 15. Checkout Procedures and Troubleshooting
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.................................................... [ ]
2211-AC29D1-8-EN
15.2 Troubleshooting
TROUBLESHOOTING
Compressor fails to start
Contactor check
Is contactor
energized?
(contacts closed)
YES
Go To: Compressor won’t run
NO
Check for 24 volts AC
across contactor coil
Is voltage
present at
contactor coil?
YES
Replace contactor
NO
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
Jumper R to Y low
voltage terminals
at thermostat sub
base.
YES
Does the
contactor
energize?
NO
Repair or replace
connecting wiring
Single Pole Contactor (MS)*
T2
Double Pole Contactor (MS)*
T1
HIGH
VOLTAGE
IN
Replace the room
thermostat
NO
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
OUT
YES
T2
T1
HIGH
VOLTAGE
Contactor Coil
24 VAC
L2
L1
OUT
L2
L1
IN
*Refer to Wiring Diagram to determine if a single pole or double pole contactor is used.
11-AC29D1-8-EN
23
TROUBLESHOOTING
Compressor won’t run
Contactor is closed
Check for high
voltage to contactor
Is high voltage present
at T1 and T2 ?
YES
Check for open IOL
(Internal Overload)
Check resistance of
C to S and C to R
NO
Check power
supply from
disconnect and/or
breaker panel.
Does the
resistance check
show an open
circuit from C to S
or C to R?
YES
Allow compressor
time to cool and
re-test
NO
Check for open
windings.
Does a resistance check
show an open circuit
between R and S?
YES
Replace the
compressor
NO
Check for locked
rotor
Is voltage present
at C to S and C
to R with locked
rotor amps on C?
YES
Check StartCapacitor and
Relay (if present)
and Run Capacitor
NO
Check wiring to
compressor
C, S and R
Do the start
components and
run capacitor
check good?
YES
Replace the
compressor
NO
Replace start
components and/
or run capacitor
2411-AC29D1-8-EN
15.2 Troubleshooting
.
DEF
OL F.
E
NTR
CO
YD
ST RELA ING
RO
K
T
D E F F RO S
LEA E
DE VALVE ECTIV
CK
DEF NG
CHE COIL LEAKI
S
SOV SOV CTION
T R I OW
RES AIRFL
IR.
EAT
.C
I.D.
R E F R E S. U P E R H N
S
PE
KO
TUC ATION
L
VS
/EE
W
RCU
TXV RECI IRFLO
A
R
S
.D.
. AI
BLE
O.D RES. O ENSA D
D
N
L OA
NCO AP.
NO E EV ARGE
H
IV
ESS
ERC GE
EXC EF. OV CHAR .
R
P
R
NDE COM
T
.U
REF FICIEN SSOR
E
F
INE OMPR USE
F
C
CK
IL
AG E
STU VOLT R CO
AT
CTO
L OW
OST
NTA
CO HERM ER
M
T
OR
NSF ING
TRA WIR
E
OL
G
TS
NTR OLTA NTAC
V
CO
CO LAY
E
LOW TOR
C
TR
NTA STAR ITOR
C
CO
A
CAP ITOR
C
RT
STA CAPA IOL
RUN SSOR G
RE IRIN
MP
CO AGE W PLY
OLT
SUP E
H V ER
H I G P OW K M O D
C
CHE
TO
AT
*
WH
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback (TXV/EEV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won’t 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
P
P
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
S
S
S
S
P
P
S
S
P
S
P
S
S
P
P
P
P
P
P
S
S
S
S
S
S
S
S
P
S
S
S
S
S
S
P
P
S
S
S
S
P
P
P
P
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
P
P
S
S
P
P
S
S
P
P
S
S
S
S
S
S
P
P
P
S
S
P
S
S
P
P
S
S
P
S
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
S
S
S
S
P
P
P
P
S
S
P
P
S
S
P
P
S
S
S
S
S
S
S
S
S
DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
C - Cooling
H - Heating
C
H
C
H
C
H
P - Primary Causes
P
P
P
S - Secondary Causes
11-AC29D1-8-EN
P
P
P
*
S
S
S
P
P
- 3 Phase Only
25
16.0 Refrigerant Circuits
1.5 & 2 Ton Units
PRINTED FROM D157394P02 REV A
2.5 & 3.5 Ton Units
PRINTED FROM D157394P01
2611-AC29D1-8-EN
3 & 4 Ton Units
PRINTED FROM D158796P01 REV A
5 Ton Units
PRINTED FROM C151867
11-AC29D1-8-EN
27
6200 Troup Highway
Tyler, TX 75707
www.americanstandardair.com
The manufacturer has a policy of continuous product and product data improvement
and it reserves the right to change design and specifications without notice.
Representative-only illustrations included in this document.
© 2016 American Standard Heating & Air Conditioning
07/16
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