American Standard 4TWA3036B3000A Service manual

Service Facts
IMPORTANT — This document contains a wiring diagram, a parts list, and service information. This is customer property and
is to remain with this unit. Please return to service information pack upon completion of work.
© 2016 Trane
NOTICE: The manufacturer has a policy of continuous product and product data improvement
and it reserves the right to change design and specifications without notice.
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 MANUFACTURER OR SELLER CANNOT
BE RESPONSIBLE FOR THE INTERPRETATION OF THIS INFORMATION,
NOR CAN IT ASSUME ANY LIABILITY IN CONNECTION WITH ITS USE.
CAUTION
!
RECONNECT ALL GROUNDING DEVICES.
ALL PARTS OF THIS PRODUCT CAPABLE OF CONDUCTING
ELECTRICAL CURRENT ARE GROUNDED. IF GROUNDING
WIRES, SCREWS, STRAPS, CLIPS, NUTS OR WASHERS USED
TO COMPLETE A PATH TO GROUND ARE REMOVED FOR
SERVICE, THEY MUST BE RETURNED TO THEIR ORIGINAL
POSITION AND PROPERLY FASTENED.
WARNING:
HAZARDOUS VOLTAGE - DISCONNECT POWER and DISCHARGE
CAPACITORS BEFORE SERVICING
CAUTION
!
UNIT CONTAINS R-410A
REFRIGERANT!
R-410A OPERATING PRESSURE EXCEEDS THE
LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS
REQUIRED. FAILURE TO USE PROPER SERVICE
SERVICE
USE ONLY R-410A REFRIGERANT AND
APPROVED POE COMPRESSOR OIL.
PRODUCT SPECIFICATIONS
OUTDOOR UNIT 12
POWER CONNS. — V/PH/HZ 3
MIN. BRCH. CIR. AMPACITY
BR CIR PROT RTG – MAX. (AMPS)
COMPRESSOR
NO. USED - NO. SPEEDS
VOLTS/PH/HZ
R.L. AMPS 7- L.R. AMPS
FACTORY INSTALLED
START COMPONENTS 8
INSUL/SOUND BLANKET
COMPRESSOR HEAT
OUTDOOR FAN
DIA. (IN.) - NO. USED
TYPE DRIVE - NO. SPEEDS
CFM @ 0.0 IN. W.G. 4
NO. MOTORS - HP
MOTOR SPEED R.P.M.
VOLTS/PH/HZ
F.L. AMPS
OUTDOOR COIL — TYPE
ROWS - F.P.I.
FACE AREA (SQ. FT.)
TUBE SIZE (IN.)
REFRIGERANT
LBS — R-410A (O.D. UNIT) 5
FACTORY SUPPLIED
LINE SIZE - IN. O.D. GAS 6
LINE SIZE - IN. O.D. LIQ. 6
CHARGING SPECIFICATION
SUBCOOLING
DIMENSIONS
CRATED (IN.)
WEIGHT
SHIPPING (LBS.)
NET (LBS.)
4TWA3B-SF3-3F-EN
Split System
Cooling
4TWA3036B3000A, 4TWA3042B3000A,
4TWA3048B3000B, 4TWA3060B3000A
02/17
4TWA3060B3000A
208/230/3/60
20
35
SCROLL
1 - 1
208/230/3/60
15.6 - 110
NO
NO
YES
PROPELLER
27.6 - 1
DIRECT - 1
4760
1 - 1/5
850
200/230/1/60
.93
SPINE FIN™
1 - 24
27.86
3/8
8 LBS., 14 OZ.
YES
7/8
3/8
8°F
H X W X D
46.4 x 35.1 x 38.7
280
244
4TWA3042B3000A
208/230/3/60
18
30
SCROLL
1 - 1
208/230/3/60
13.6 - 83
NO
NO
YES
PROPELLER
27.6 - 1
DIRECT - 1
4395
1 - 1/5
850
200/230/1/60
.93
SPINE FIN™
1 - 24
21.99
3/8
7 LBS., 7 OZ.
YES
3/4
3/8
8°F
H X W X D
38.4 x 35.1 x 38.7
248
214
4TWA3036B3000A
208/230/3/60
14
20
SCROLL
1 - 1
208/230/3/60
10.4 - 73
NO
NO
YES
PROPELLER
27.6 - 1
DIRECT - 1
4385
1 - 1/5
850
200/230/1/60
.93
SPINE FIN™
1 - 24
21.99
3/8
7 LBS., 14 OZ.
YES
3/4
3/8
10°F
H X W X D
38.4 x 35.1 x 38.7
228
197
4TWA3048B3000B
208/230/3/60
18
30
SCROLL
1 - 1
208/230/3/60
13.7 - 83
NO
NO
YES
PROPELLER
27.6 - 1
DIRECT - 1
4400
1 - 1/6
835
200/230/1/60
1.30
SPINE FIN™
1 - 24
27.86
3/8
8 LBS., 10 OZ.
YES
7/8
3/8
10°F
H X W X D
46.4 x 35.1 x 38.7
279
243
1Certified in accordance with the Air-Source Unitary Air-conditioner
Equipment certification program, which is based on AHRI standard
210/240.
2Rated in accordance with AHRI standard 270.
3Calculated in accordance with Natl. Elec. Codes. Use only HACR circuit
breakers or fuses.
4Standard Air — Dry Coil — Outdoor
5This value approximate. For more precise value see unit nameplate.
6Max. linear length 60 ft.; Max. lift - Suction 60 ft.; Max lift - Liquid 60 ft.
For greater length consult refrigerant piping software Pub. No. 32-3312-
0* (* denotes latest revision).
7This value shown for compressor RLA on the unit nameplate and on this
specification sheet is used to compute minimum branch circuit ampacity
and max. fuse size. The value shown is the branch circuit selection cur-
rent.
8No means no start components. Yes means quick start kit components.
PTC means positive temperature coefficient starter.
CONTAINS REFRIGERANT!
SYSTEM CONTAINS OIL AND REFRIGERANT
UNDER
HIGH PRESSURE. RECOVER REFRIGERANT TO
RELIEVE PRESSURE BEFORE OPENING SYSTEM.
CAUTION
!
HOT SURFACE!
DO NOT TOUCH TOP OF
CAUTION
!
TUBING INFORMATION
LINE TYPE REFRIGERANT TO ADD AT SPECIFIED
ADDITIONAL LENGTH
Suction Liquid 20 ft 30 ft 40 ft 50 ft 60 ft
3/4" 3/8" 3 oz 9 oz 15 oz 21 oz 27 oz
7/8" 3/8" 3 oz 9 oz 16 oz 22 oz 28 oz

SCHEMATIC DIAGRAM
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
The manufacturer recommends installing approved matched indoor and outdoor
systems.
All split systems are AHRI rated with only EEV/TXV indoor systems.
The benefits of installing approved indoor and outdoor split systems are maxi-
mum efficiency, optimum performance and the best overall system reliability.
The following charging methods are therefore prescribed for systems with indoor
EEV/TXVs.
1. Subcooling (in the cooling mode) is the only recommended method of charg-
ing above 55°F ambient temperatures.
2. For best results - the indoor temperature should be kept between 70°F to
80°F. Add system heat if needed.
3. At start-up, or whenever charge is removed or added, the system must be
operated for a minimum twenty (20) minutes to stabilize before accurate
measurements can be made.
4. Measure Liquid Line Temperature and Refrigerant Pressure at service
valves.
5. Determine total refrigerant line length, and height (lift) if indoor
section is above the condenser. Use the Subcool Charging
Chart Corrections Table to calculate any additional subcooling
required for your specific application.
6. Determine the Design Subcooling from the unit nameplate or Ser-
vice Facts. Add any additional amount of subcooling calculated
in Step 5 to the Design Subcooling to arrive at the final subcooling
value.
7. Locate this value in the appropriate column of the R-410-A Re-
frigerant Charging Chart. Locate your liquid line temperature in
the left column of the chart, and the intersecting liquid line pres-
sure under your calculated subcooling value column. Add refriger-
ant to raise the pressure to match the chart, or remove refrigerant
to lower the pressure. Again, wait twenty (20) minutes for the
system conditions to stabilize before adjusting charge again.
8. When system is correctly charged, you can refer to System Pres-
sure Tables to verify typical performance.
2 4TWA3B-SF3-3F-EN

WIRING DIAGRAM
SUBCOOLING CHARGING BELOW 55°F OD AMBIENT – IN HEATING ONLY
8910 11 12 13 14
55 179 182 185 188191 195 198
60 195 198 201 204208 211 215
65 211 215 218 222225 229 232
70 229 232 236 240243 247 251
75 247 251 255 259263 267 271
80 267 271 275 279283 287 291
85 287 291 296 300304 309 313
90 309 313 318 322 327 331 336
95 331 336 341 346 351 355 360
100 355 360 365 370 376 381 386
105 381 386 391 396 402 407 413
110 407 413 418 424 429 435 441
115 435 441 446 452 458 464 470
120 464 470 476 482 488 495 501
125 495 501 507 514 520 527 533
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or
Installer's Guide for charging method.
LIQUID
TEMP
(˚F)
DESIGN SUBCOOLING (˚F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev. 2
1. The Subcool Charging Method in cooling is not recom-
mended below 55°F outdoor ambient.
2. The only recommended method of charging at outdoor
ambients below 55°F, is to weigh in the charge in the
heating mode.
3. Use Nameplate charge plus standard charge adders for
line length.
4. Check liquid line temperature and pressure (at the OD
valves) to obtain
a minimum of 10°F subcooling.
5. Add charge if a minimum of 10°F subcooling is not
obtained with the nameplate charge plus line length cor-
rection.
6. It is important to return in the spring
or summer to accurately charge the system in the cooling
mode at outdoor ambients above 55°F.
4TWA3B-SF3-3F-EN 3

3 1/2 Ton
Add 6°
Add 5°
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10 20 25 30 40 60
Add 3° of Subcooling
Add 2° of Subcooling
Add 1° of Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
5 Ton
Add 6°
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10 20 25 30 40 60
Add 5° of Subcooling
Add 4° of Subcooling
Add 3° of Subcooling
Add 2° of Subcooling
Add 1° of Subcooling
Design
60
50
40
30
25
20
15
10
0
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TROUBLESHOOTING
Measure sub-cooling at
the outdoor unit.
Is subcooling greater
than 8°?
NO
YES
Is outdoor
ambient above
55 °F?
Remove sensing bulb from the
suction line. Observe liquid
pressure and suction pressure while
holding the bulb in bare hand for
one minute.
Does Liquid pressure decrease and
suction pressure increase?
YES
Replace the
TXV
TXV is OK
Measure superheat on suction
line at TXV sensing bulb.
Is superheat over 6°F and
under 20°F?
NO
YES
Verify system charge
using Service Facts
Before starting, insure proper fan motor
operation and both indoor and outdoor
coils are clean and clear of ice.
Stop. Outdoor
ambient is too
warm for this
test
NO
YES
NO
Troubleshooting Outdoor TXV / Heating Mode
4 Ton
Add 6°
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10 20 25 30 40 60
Add 4° of Subcooling
Add 3° of Subcooling
Add 2° of Subcooling
Add 1° of Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
3 Ton
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET
)
10 20 25 30 40 60
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
Add 5°
Add 4°
Add 2°
Add 3° of Subcooling
Add 1° of Subcooling
4 4TWA3B-SF3-3F-EN

Is contactor
energized?
(contacts closed)
Is voltage
present at
contactor coil?
Replace contactor
YES
NO NO
Check for 24 volts AC
across contactor coil
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
NO
YES
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
Jumper R to Y low
voltage terminals
at thermostat sub
base.
Does the
contactor
energize?
NO
Repair or replace
connecting wiring
YES Go To: Compressor won’t run
Replace the room
thermostat
YES
Compressor fails to start
Contactor check
TROUBLESHOOTING
L2 L1
T2 T1
IN
OUT
L2 L1
T2 T1
Single Pole Contactor (MS)* Double Pole Contactor (MS)*
Contactor Coil
24 VAC
HIGH
VOLTAGE
IN
OUT
HIGH
VOLTAGE
*Refer to Wiring Diagram to determine if a single pole or double pole contactor is used.
Check for open IOL
(Internal Overload)
Check resistance of
C to S and C to R
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.
YES
Does a resistance check
show an open circuit
between R and S?
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 Start-
Capacitor and
Relay (if present)
and Run Capacitor
Do the start
components and
run capacitor
check good?
YES Replace the
compressor
NO
Replace start
components and/
or run capacitor
NO
Check wiring to
compressor
C, S and R
Check for high
voltage to contactor
Is high voltage present
at T1 and T2 ?
YES
NO
Check power
supply from
disconnect and/or
breaker panel.
Compressor won’t run
Contactor is closed
TROUBLESHOOTING
4TWA3B-SF3-3F-EN 5

DEFROST TERMINATION TEMPERATURE
J1
U1
J2
J3
FRC_DFT
TST
TEST_COMMON
JUMPER 2
TEST PINS
Defrost controls have a selectable termination temper-
ature. Cutting jumper J2 (shown below) will achieve a
termination temperature of 70° when the ambient tem-
perature is below 30° (see table at left).
Defrost Board
Detail
Defrost Termination Temperatures
Outdoor
Temperature
Termination
Temperature
As
Shipped
>22°F 47°F
10°F–22°F ODT + 25°F
6°F–10°F 35°F
Cut
Jumper 2
>30°F 47°F
6°F–30°F 70°F
All < 6°F 12 min. or 35°F
every 3 hrs.
Heating Refrigeration Cycle
Cooling Refrigeration Cycle
Printed from D154705
REFRIGERANT CIRCUITS
6 4TWA3B-SF3-3F-EN

PRESSURE CURVES FOR 4TWA3042B3/4
TAM4A0B42S31 TAM4A0B42S31
Cooling Heating
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
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, 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) or (5). EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION
ACTUAL:
(4) DISCHARGE PRESSURE IS 333 PSIG
DISCHARGE PRESSURE SHOULD BE +/- 10 PSIG OF CHART
(5) SUCTION PRESSURE IS 138 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES GAS - 3/4" O.D. LIQUID - 3/8" O.D.
DWG.NO. 4TWA3042B3/4
(2)
(5) (3)
(1)
110 115 120 125 130 135 140 145 150 155 160
55 65 75 85 95
105115
(2)
(4) (3)
(1)
225 275 325 375 425 475 525
55 65 75 85 95
105115
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30 40 50 60 70 80 90
100 110 120 130 140 150
-5 5 15 25 35 45 55 65
225 275 325 375 425
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
INDOOR ENTERING DRY BULB CURVESTOP TO BOTTOM 80, 70, AND 60 DEG F.
PRESSURE CURVES FOR 4TWA3036B3/4
TEM3A0C42S41+TDR
TEM3A0C42S41+TDR
Cooling @ 1350 SCFM Heating @ 1350 SCFM
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTION PRESSURE (PSIG)
125
130 135 140 145 150 155 160 165 170
200 250 300 350 400 450 500
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
40 50 60 70 80 90
100 110 120 130 140
200 250 300 350 400 450 500
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F. INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
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, 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
ACTUAL:
(4) DISCHARGE PRESSURE @ 1350 CFM IS 315 PSIG.
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1350 CFM IS 143 PSIG.
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 3/4" O.D.
LIQUID - 3/8" O.D.
DWG.NO.
4TWA3036B3/4
125 130 135 140 145 150 155 160 165 170
40 60 80 100 120
200 250 300 350 400 450 500
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30 40 50 60 70 80 90
100 110 120 130 140
-5 5 15 25 35 45 55 65
200 250 300 350 400 450 500
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F. INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
4TWA3B-SF3-3F-EN 7

02/17
The manufacturer has a policy of continuous product and product data improvement and it reserves the
right to change design and specifications without notice.
PRESSURE CURVES FOR 4TWA3060B3/4
TAM4A0C60S51 TAM4A0C60S51
Cooling Heating
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
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, 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) or (5). EXAMPLE: (1) OUTDOOR TEMP. 82 F. (2) INDOOR WET BULB 67 F. (3) AT INTERSECTION
ACTUAL:
(4) DISCHARGE PRESSURE IS 356 PSIG
DISCHARGE PRESSURE SHOULD BE +/- 10 PSIG OF CHART
(5) SUCTION PRESSURE IS 136 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES GAS - 7/8" O.D. LIQUID - 3/8" O.D.
DWG.NO. 4TWA3060B3/4
(2)
(5) (3)
(1)
110 115 120 125 130 135 140 145 150 155 160
55 65 75 85 95
105115
(2)
(4) (3)
(1)
250 300 350 400 450 500 550 600
55 65 75 85 95
105115
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30 40 50 60 70 80 90
100 110 120 130 140
-5 5 15 25 35 45 55 65
225 275 325 375 425 475
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
INDOOR ENTERING DRY BULB CURVESTOP TO BOTTOM 80, 70, AND 60 DEG F.
PRESSURE CURVES FOR 4TWA3048B4
TAM4A0C48S41
TAM4A0C48S41
Cooling with Thermal Expansion Valve
Heating
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
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, 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 ACTUAL:
(4) DISCHARGE PRESSURE @ 1550 CFM IS 330 PSIG.
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1550 CFM IS 138 PSIG.
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 7/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4TWA3048B4
110 115 120 125 130 135 140 145 150 155 160 165 170
40 60 80 100 120
200 250 300 350 400 450 500
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30 40 50 60 70 80 90
100 110 120 130 140
-5 5 15 25 35 45 55 65
200 250 300 350 400 450 500
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60 DEG F.