American Standard 4A7A5018 06 Condensing Units User Manual
- June 9, 2024
- American Standard
Table of Contents
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
2
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-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.
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.
11-AC46D1-1B-EN
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.
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-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.
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.
11-AC46D1-1B-EN
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
14
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
11-AC46D1-1B-EN
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
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11-AC46D1-1B-EN 05 Jul 2022 Supersedes 11-AC46D1-1A-EN (April 2022)
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