11-BC39D1-1B-EN
Installer’s Guide Heat Pumps 4A6H6
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 A.H.R.I. 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...................................................... 7 Section 7. Refrigerant Line Brazing....................................................... 8 Section 8. Refrigerant Line Leak Check.............................................. 10 Section 9. Evacuation............................................................................ 11 Section 10. Service Valves.................................................................... 11 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 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-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.
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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)
4A6H6024H
33 x 30 x 33
174
4A6H6030H
37 x 34 x 37
198
4A6H6036H
37 x 34 x 37
199
4A6H6042H
45 x 34 x 37
227
4A6H6048H
45 x 34 x 37
250
4A6H6060H
45 x 34 x 37
251
W
H
* Weight values are estimated.
D
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 length of refrigerant lines from outdoor to indoor unit should NOT exceed sixty (60) feet. 2. The maximum vertical change should not exceed sixty (60) feet*. 3. Service valve connection diameters are shown in Table 5.1. Note: For line lengths greater than sixty (60) feet, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping Software Program, 32-3312-03 (or latest revision).
Standard Line Set 60’ Max Line Length
*
60’ Max Vertical Change
*
60’ Max Vertical Change
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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. Do not locate close to bedrooms as operational sounds may be objectionable.
Min 5’ Unrestricted
Min. 12” to Shrubbery
Avoid locations such as near windows where condensation and freezing defrost vapor can annoy a customer.
Min 3’ Unrestricted
Access Panel
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
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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.
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Section 5. Refrigerant Line Considerations 5.1 Refrigerant Line and Service Valve Connection Sizes Table 5.1 Line Sizes
Service Valve Connection Sizes
Model
Vapor Line
Liquid Line
Vapor Line Connection
Liquid Line Connection
4A6H6024H
3/4
3/8
3/4
3/8
4A6H6030H
3/4
3/8
3/4
3/8
4A6H6036H
7/8
3/8
3/4
3/8
4A6H6042H
7/8
3/8
7/8
3/8
4A6H6048H
7/8
3/8
7/8
3/8
4A6H6060H
1-1/8
3/8
7/8
3/8
5.2 Factory Charge American Standard Heating & Air Conditioning 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. Line Length
Total Vertical Change (lift) = __________ Ft.
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
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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
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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.
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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.
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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.
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.
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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
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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.
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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.
Table 11.1 24 VOLTS WIRE SIZE
MAX. WIRE LENGTH
18 AWG
150 Ft.
16 AWG
225 Ft.
14 AWG
300 Ft.
11.2 Low Voltage Hook-up Diagrams
With TEM 3, 4, 6 Thermostat
With TAM 4, 5, 7
Air Handler
Outdoor Unit
R
Thermostat
R
R
R
FAN
G
G
B/C
Blue
B
B
SOV
O
O
O
COOL/HEAT 1st STAGE
Yl
Yl
R
R
FAN
G
G
B/C
Blue
B
B
24 VAC Common
SOV
O
O
O
COOL/HEAT 1st STAGE
Y
Y*
Y
HEATING 2nd STAGE
W
W1
EMERGENCY HEAT
X2
W2
YO
White
Pink
Outdoor Unit
24 VAC HOT
24 VAC HOT
24 VAC Common
Air Handler
X2
HEATING 2nd STAGE
W
W1
EMERGENCY HEAT
X2
W2
Black
YO
White
Pink
X2
Black
• Units with pigtails require wirenuts for connections. • In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
* Y2 for TEM6
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11.3 Defrost Control Defrost controls have a selectable termination temperature. As shipped, defrost will terminate at 47°F. For a higher termination temperature, cut Jumper J2 to achieve 70°F. See Service Facts shipped in the outdoor unit for more information.
Defrost Board Detail
Pin Identification on J5 (See Illustration) 1. TEST_COMMON (Shorting to FRC_DFT causes the control to initiate Forced Defrost. Leaving this pin open results in the normal mode of operation.) 2. FRC_DFT = Forced Defrost (Short TEST_ COMMON to this pin for two (2) seconds to initiate a forced defrost. Remove the short after defrost initiates.) Defrost Control Checkout Normal operation requires: • Status LED on board flashing 1 time/second in standby or 2 times/second with a call for Jumper J2 J5 Test Pins heating or cooling. • 24V AC between R & B • 24V AC between Y, Y0 & B with unit operating • Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin. If a defrost control problem is suspected, refer to the service information in control box.
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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.
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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
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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.
120º F
See Section 14.2 for Outdoor Temperatures Above 55º 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
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STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below. 2 1/2 Ton Heat Pump
60 50 40 30 25 20 15 10 0
Add 1º
Use Design Subcooling
10
20 25 30 40 TOTAL REFRIGERANT LINE LENGTH (FT)
60
REFRIGERANT LINE LIFT (FT)
REFRIGERANT LINE LIFT (FT)
2 Ton Heat Pump SUBCOOL CHARGING CHART CORRECTIONS TABLE
SUBCOOL CHARGING CHART CORRECTIONS TABLE 60 50 40 30 25 20 15 10 0
Add 2º Add 1º
Use Design Subcooling
10
REFRIGERANT LINE LIFT (FEET)
Add 5°
60
Add 4°
50
Add 3° of Subcooling
40 30
Add 2°
Add 1° of Subcooling
25 20 15
Use Design Subcool Value
10 0 10 20 25 30 40 60 TOTAL REFRIGERANT LINE LENGTH (FEET)
SUBCOOL CHARGING CHART CORRECTIONS TABLE 60 50 40 30 25 20 15 10 0
Add 6º Add 5º Add 3º Add 2º Add 1º Use Design Subcooling 10
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Add 2º Add 1º
Add 5º Add 4º Add 3º Add 2º
Use Design Subcooling
10
20 25 30 40 TOTAL REFRIGERANT LINE LENGTH (FT)
60
5 Ton Heat Pump
20 25 30 40 TOTAL REFRIGERANT LINE LENGTH (FT)
60
REFRIGERANT LINE LIFT (FT)
REFRIGERANT LINE LIFT (FT)
4 Ton Heat Pump 60 50 40 30 25 20 15 10 0
60
3 1/2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FT)
3 Ton Heat Pump
20 25 30 40 TOTAL REFRIGERANT LINE LENGTH (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE 60 50 40 30 25 20 15 10 0
30 ft. Maximum Lift Add 1º
Use Design Subcooling
10
20 25 30 40 TOTAL REFRIGERANT LINE LENGTH (FT)
60
Design Subcooling Value = __________º F (from nameplate or Service Facts)
Subcooling Correction = __________º F Final Subcooling Value = __________º F
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.
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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 = __________ PSIG Final Subcooling Value = __________ º F
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 PSIG. (This is the shown as the intersection of the Final Subcooling column and the Liquid Temperature row.
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
Special subcooling for application with TEM6 AH Outdoor Unit Model No.
Indoor Unit Model No.
Subcooling
4A6H6024H1000A
TEM6A0C36H31
13º
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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.
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.
(Example only - see Service Facts) PRESSURE CURVES FOR 4TWX5049E1 4TEE3F49C1
4TEE3F49C1
Cooling @ 1450 SCFM
Refer to System Pressure Curves in the Service Facts to verify typical performance.
DISCHARGE PRESSURE (PSIG)
550
Heating @ 1350 SCFM
500
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
500
(2)
450
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
450 400
400 350 350
(4)
(3)
300
300
250
250
(1)
200 40
60
80
200 100
-5
120
5
15
25
35
45
55
25
35
45
55
65
OUTDOOR TEMPERATURE (Degree F) 170
SUCTION PRESSURE (PSIG)
165 160
140
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
150 145
120 110 100
(5)
140
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
130
(2)
155
(3)
90
135
80
130
70 60
125
50
120 115
40
(1)
110 40
60
80
30 100
120
-5
5
15
65
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, DISCHARGE 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 DISCHARGE OR SUCTION PRESSURE IN LEFT COLUMN (4). EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION (4) DISCHARGE PRESSURE @ 1450 CFM IS 323 PSIG (5) SUCTION PRESSURE @ 1450 CFM IS 140 PSIG
ACTUAL: DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES GAS - 7/8" O.D. LIQUID - 3/8" O.D. DWG.NO. 4TWX5049E1
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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. (In Heating Only) The Subcooling Charging method in cooling is not recommended below 55º F outdoor temperature. The only recommended method of charging at outdoor temperatures below 55º F is weighing in the charge in heating mode.
Table 14.3
STEP 1 - Determine additional charge. From the nameplate label (shown in Section 12.1), record namplate charge below. 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 Table 14.3, find the charge associated with the additional length of tubing above 15 ft. and record it below.
TUBING INFORMATION LINE TYPE
REFRIGERANT TO ADD AT SPECIFIED ADDITIONAL LENGTH
Tonnage
Suction Line
Liquid Line
20 ft
30 ft
40 ft
2 - 2.5 Ton
3/4"
3/8"
3 oz
9 oz
15 oz 21 oz 27 oz
3 - 4 Ton
7/8"
3/8"
3 oz
9 oz
16 oz 22 oz 28 oz
1-1/8"
3/8"
4 oz
11 oz 18 oz 25 oz 32 oz
5 Ton
50 ft
60 ft
Namplate charge = ____________ Oz. Charge adder = ______________ Oz. (from Table 14.2)
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STEP 2 - 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 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.................................................... [ ]
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15.2 Troubleshooting . DEF OL NTR DEF. CO Y 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 ION V S CULAT /EE W R TXV RECI IRFLO R D. A BLES . . AI 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 F RE E INE S MP CO E FU CK AG C O I L STU VOLT R O LOW TACT STAT O N RM CO R THE ORME NSF ING TRA WIR OL G E AC T S NTR LTA CO W VO CONT AY EL LO TOR C TR NTA STAR CITOR 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
P P
S S 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
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
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-BC39D1-1B-EN
P
P P
*
S
S
S
P
P
- 3 Phase Only
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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. © 2014 American Standard Heating & Air Conditioning
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