Carrier | 38AH044 38AH044-134 | Specifications | Carrier 38AH044 38AH044-134 Specifications

38AH044-134
Air-Cooled Condensing Units
50/60 Hz
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38
Step 1 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 1
• DOMESTIC UNITS
• EXPORT UNITS
• PLACING UNITS
Step 2 — Check Compressor Mounting . . . . . . . . . . 4
• UNITS 38AH044-084
• UNITS 38AH094-134
Step 3 — Make Refrigerant Piping
Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
• UNITS 38AH124-134
• CONNECT TUBING FROM EVAPORATOR TO
CONDENSING UNIT
Step 4 — Make Electrical Connections . . . . . . . . . . 24
• POWER SUPPLY
• FIELD POWER CONNECTIONS
• MAIN POWER
• CONTROL CIRCUIT WIRING
Step 5 — Install Accessories . . . . . . . . . . . . . . . . . . . . 38
• LOW-AMBIENT OPERATION
• MISCELLANEOUS ACCESSORIES
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38,39
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-47
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47-52
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 53,54
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can be
hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment.
Untrained personnel can perform basic maintenance functions, such as cleaning coils. All other operations should be
performed by trained service personnel.
When working on the equipment, observe precautions in the
literature, and on tags, stickers, and labels attached to the
equipment and any other safety precautions that may apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging, and setting bulky
equipment.
WARNING
Open all remote disconnects before servicing this equipment. Electric shock can cause personal injury.

WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from system using both high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen
and the work area should be well ventilated. Refrigerant in contact with an open flame produces toxic
gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit. Use a pan to catch
any oil that may come out of the lines and as a gage
for how much oil to add to the system.
e. Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal
injury or death.

CAUTION
DO NOT re-use compressor oil or any oil that has been
exposed to the atmosphere. Dispose of oil per local codes
and regulations. DO NOT leave refrigerant system open to
air any longer than the actual time required to service the
equipment. Seal circuits being serviced and charge with
dry nitrogen to prevent oil contamination when timely
repairs cannot be completed. Failure to follow these procedures may result in damage to equipment.
INSTALLATION
Step 1 — Rig and Place Unit — All units are de-
signed for overhead rigging, and it is important that this method be used. Lifting holes are provided in the frame base rails,
which are marked for rigging (see rigging label on the unit and
Tables 1, 2A and 2B, and Fig. 1 for rigging weights and center
of gravity). It is recommended that field-supplied pipes, of sufficient length to extend at least 12 in. (305 mm) beyond the
frame, be passed through the holes.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53380004-01
Printed in U.S.A.
Form 38AH-22SI
Pg 1
612 3-09
Replaces: 38AH-20SI
Fig. 1 — Rigging Label
PLACING UNITS — Refer to Fig. 1 for rigging details. The
placement area must be level and strong enough to support the
operating weight of the unit (see Table 3A-4B). When unit is in
proper location, use of mounting holes in base rails is recommended for securing unit to supporting structure. For mounting
unit on vibration isolators, 4 x 24 in. perimeter support “c”
channels between the unit and the isolators are recommended
with a minimum of 4 channels per unit. Fasteners for mounting
unit are field supplied. Be sure to mount unit level to ensure
proper oil return to compressors. See Fig. 2.
IMPORTANT: To maintain unit stability while lifting,
use 4 cables, chains or straps of equal length. Attach one
end of each cable to one pipe end and the other end of
each cable to the overhead rigging point.
Use spreader bars or frame to keep the cables, chains, and
straps clear of the unit sides. Leave standard coil protection
packaging in place during rigging to provide protection to
coils. Remove and discard all coil protection after rigging cables are detached.
DOMESTIC UNITS — For units 38AH044-084, 124, and
134; standard unit packaging consists of coil protection only.
There is no standard packaging provided for units 38AH094
and 104. Skids are not provided. If overhead rigging is not
available at the jobsite, place the unit on a skid or pad before
dragging or rolling. When rolling, use a minimum of 3 rollers.
When dragging, pull the pad or skid. Do not apply force to the
unit. When in final position, raise from above to lift unit off the
pad or skid.
EXPORT UNITS — All export units are mounted on skids
with vertical coil protection. Leave the unit on the skid until it
is in final position. While on the skid, the unit can be rolled or
skidded. Apply force to the skid, not to the unit. Use a minimum of 3 rollers when rolling. When in final position, raise
from above to remove the skid.
CAUTION
Do not forklift these units unless the unit is attached to a
skid designed for forklifting. Failure to follow this requirement could result in equipment damage or personal injury.
Units 38AH044-084 — Refer to Fig. 3 and 4 for airflow
clearances. Recommended minimum clearances are 6 ft
(1829 mm) for unrestricted airflow and service on sides of
unit, 5 ft (1524 mm) on ends, and unrestricted clear air space
above the unit. Provide ample space to connect liquid and suction lines to indoor unit. For multiple units, allow 8 ft
(2440 mm) separation between units for airflow and service.
2
Table 1 — Rigging Center of Gravity — in. (mm)
UNIT
38AH
Dimension X
Dimension Y
Dimension X-C
Dimension Y-C
Dimension K
Dimension L
Dimension K-C
Dimension L-C
044
054
064
074
084
094
104
49 (1232)
39 (984)
49 (1234)
39 (993)
—
—
—
—
48 (1224)
39 (978)
48 (1229)
39 (991)
—
—
—
—
50 (1260)
38 (968)
50 (1261)
39 (986)
—
—
—
—
57 (1443)
39 (993)
56 (1425)
40 (1006)
—
—
—
—
57 (1448)
39 (991)
56 (1422)
40 (1008)
—
—
—
—
66 (1676)
31 (787)
66 (1676)
31 (787)
—
—
—
—
63 (1600)
34 (851)
63 (1600)
34 (851)
—
—
—
—
MODULE
124A
50 (1260)
38 (968)
50 (1260)
39 (986)
—
—
—
—
MODULE
124B
—
—
—
—
50 (1260)
38 (968)
50 (1260)
39 (986)
MODULE
134A
50 (1260)
38 (968)
50 (1260)
39 (986)
—
—
—
—
MODULE
134B
—
—
—
—
57 (1443)
39 (993)
56 (1425)
40 (1006)
LEGEND
— — Not Applicable
C — Copper Fin Coils
124, 134 UNITS ONLY
TOP VIEW, TYPICAL
The placement area must be level and strong enough to support the operating weight of the unit. See Table 4A or 4B. Refer
to the following paragraphs for the proper placement of the
unit.
Units 38AH094,104 — For mounting units on vibration isolators, a perimeter support channel is required between the unit
and the support isolators. The perimeter support channel must
be sized to support the fully assembled unit. Do not support
units on individual isolation supports. Support channel, hardware, and fasteners are field supplied. When unit is in proper
location, level unit and bolt into position with field-supplied
bolts.
Units 38AH124,134 — For ease of shipment and handling,
unit 38AH124 is shipped as 2 modules (124A and 124B) and
unit 38AH134 is shipped as 2 modules (134A and 134B). The
modules must be connected at the final installation site with the
factory-shipped piping and sheet metal trim kit mounted on
module 124A or 134A. See Fig. 9.
CAUTION
Do not move assembled 38AH124 or 134 units as a single
assembly. Always move modules individually during
installation or at any other time. Failure to follow this
requirement could result in equipment damage or personal
injury.
Fig. 2 — Perimeter Support Channel
Units 38AH094-134 — Refer to Fig. 5-8 for airflow
clearances. Recommended minimum clearances are 6 ft
(1829 mm) for unrestricted airflow and service on sides of unit,
5 ft (1524 mm) on ends, and unrestricted clear air space above
unit. Provide ample space to connect liquid and suction lines to
indoor unit. For multiple units, allow 8 ft (2440 mm) separation
between units for airflow and service.
Mark installation site for placement of modules 124A and
124B or modules 134A and 134B. See Fig. 7 and 8 for final
assembled dimensions. A service space of 24 in. (610 mm) is
required between the 2 modules for piping and sheet metal trim
installation.
Place module 124A or 134A in position, ensuring that the
control box is at the end opposite the service space. See Fig. 10.
Remove sheet metal and tubing from module 124A or 134A
sheet metal trim kit (Fig. 9). Remove sheet metal cover panels
from return-bend end of unit facing the service space. See
Fig. 10 and 11. These panels may be discarded or saved for reinstallation if module is moved from site.
CAUTION
Do not forklift these units unless the unit is attached to a
skid designed for forklifting. Failure to follow this requirement could result in equipment damage or personal injury.
3
Remove sheet metal cover panels from return-bend end of
module 124B or 134B. Place module 124B or 134B in position. The exposed return-bend ends of each module are now
opposite each other and facing the service space. The compressors of each module are on opposite sides of the unit.
Step 2 — Check Compressor Mounting
UNITS 38AH044-084 — Compressors are mounted on pans
and are held down by 4 bolts during shipment. After unit is
installed, loosen each of these bolts until the snubber washer
can be moved with finger pressure. See Fig. 12.
UNITS 38AH094-134 — Unit 38AH094 and 104 compressors are mounted on rails and held down by rail bolts during
shipment. After unit is installed, loosen the rail bolts to allow
the rails and compressors to float freely on the springs located
under the rails. See Fig. 12.
Unit 38AH124 and 134 compressors are mounted on pans
and are held down by 4 bolts during shipment. After unit is installed, loosen each of these bolts until snubber washer can be
moved with finger pressure. See Fig. 12.
IMPORTANT: Modules must be placed 24 in. (610 mm)
apart and square relative to each other.
The modules are now in position for piping installation and
final assembly. See Fig. 10. For mounting units on vibration
isolators, a perimeter support channel is required between the
assembled unit and the support isolators. The perimeter support
channel must be sized to support the fully assembled unit. Do
not support modules on individual isolation supports. Support
channel, hardware, and fasteners are field supplied.
When unit is in proper location, level unit and bolt into position with field-supplied bolts.
Table 2A — Operational Corner Weights with
Refrigerant Charge (Approximate) — Lb
UNIT
38AH
044
044C
054
054C
064
064C
074
074C
084
084C
094
094C
104
104C
MODULE
38AH
124A
124A-C
124B
124B-C
134A
134A-C
134B
134B-C
TOTAL
WEIGHT
3259
3547
3309
3597
3565
3998
3812
4229
4057
4735
5088
5813
5435
6160
3630
4063
3630
4063
3630
4063
3877
4294
Table 2B — Operational Corner Weights with
Refrigerant Charge (Approximate) — Kg
OPERATIONAL CORNER WEIGHT
A
B
C
D
939
893
695
732
1013
967
765
802
964
905
697
742
1034
978
771
814
1018
1011
765
771
1125
1117
874
879
1146
986
777
903
1272
1059
862
1035
1220
1049
827
961
1425
1186
965
1159
1114
2192
1182
601
1273
2504
1350
686
1240
2138
1302
755
1405
2423
1476
856
1037
1144
1037
1144
1037
1144
1167
1293
1030
1137
1030
1137
1030
1137
997
1080
779
889
779
889
779
889
789
874
UNIT
38AH
044
044C
054
054C
064
064C
074
074C
084
084C
094
094C
104
104C
MODULE
38AH
124A
124A-C
124B
124B-C
134A
134A-C
134B
134B-C
785
894
785
894
785
894
924
1047
TOTAL
WEIGHT
1478
1609
1501
1632
1617
1813
1729
1918
1840
2145
2308
2637
2465
2794
1647
1843
1647
1843
1647
1843
1759
1948
OPERATIONAL CORNER WEIGHT
A
B
C
D
426
405
316
332
460
438
347
364
437
411
316
337
469
444
350
369
462
459
347
350
510
508
397
399
520
447
352
410
577
481
391
470
553
476
375
436
646
538
438
526
505
994
536
272
577
1136
612
311
562
970
591
342
637
1099
670
388
470
519
470
519
470
519
529
587
467
516
467
516
467
516
452
490
353
403
353
403
353
403
358
396
356
405
356
405
356
405
419
475
LEGEND
C — Copper Fin Coils
LEGEND
C — Copper Fin Coils
NOTE: Total weight may differ from summation of corner weights
due to rounding of numerals.
NOTE: Total weight may differ from summation of corner weights
due to rounding of numerals.
TOP VIEW, TYPICAL
4
5
—
—
LEGEND
Mounting
Society of Automotive Engineers
NOTES:
1. The approximate operating weight of the unit is:
38AH044
3259 lb (1478 kg)
38AH044C
3547 lb (1609 kg)
38AH054
3309 lb (1501 kg)
38AH054C
3597 lb (1632 kg)
38AH064
3565 lb (1617 kg)
38AH064C
3998 lb (1813 kg)
2. Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
MTG
SAE
FIELD POWER SUPPLY CONNECTIONS
38AH Unit Size
V-Ph-Hz
Diameter, in. [mm]
230-3-50
35/8 [92]
208/230-3-60
35/8 [92]
044
380/460/575-3-60
21/2 [63.5]
346/380-415/3/50
21/2 [63.5]
208/230-3-60
35/8 [92]
054
380/460/575-3-60
21/2 [63.5]
346-380/415-3-50
21/2 [63.5]
208/230-3-60
21/2 [63.5]
064
380/460/575-3-60
21/2 [63.5]
346-380/415-3-50
35/8 [92]
Qty
1
1
1
1
1
1
1
2
1
1
UNIT SUCTION AND LIQUID LINES
Dual Circuit,
Single Circuit,
ft-in. [mm]
ft-in. [mm]
1
0-25/8 [67]
Suction Connection(s)
0-2 /8 [54]
0-7/ [22]
Liquid Connection(s)
0-11/8 [29]
8
Suction C
2-11/16 [627]
1-105/16 [567]
Liquid D
1-101/16 [561]
1-105/16 [567]
Suction (Ckt A)
1-713/16 [503]
2-5/8 [626]
Suction (Ckt B)
2-5/8 [626]
—
Liquid (Ckt A)
2-53/4 [756]
2-111/8 [892]
Liquid (Ckt B)
2-105/8 [879]
—
Description
Fig. 3 — Dimensions — Units 38AH044-064
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
3. Mounting holes may be used to mount unit to concrete pad.
They are not recommended for mounting unit to spring isolators.
If spring isolators are used, a perimeter support channel
between the unit and the isolators is recommended.
4. Two 2 in. (51 mm) dia holes are recommended for parallel conductors on 044 (230-v) units and on 044 and 054 (208/230-v)
units.
5. A 35/8 in. (86 mm) hole is recommended for single entry power
on 064 (208/230-v) units.
6. “C” in the package number indicates copper coils.
7. See Table 1 for rigging center of gravity (Dimensions X,Y). See
Tables 2A and 2B for A-D corner weights.
8. Circled numerals in Top View refer to condenser fans by position.
(SEE NOTES 4 AND 5 AND CONNECTIONS TABLE)
a38-7056
6
NOTES:
1. The approximate operating weight of the unit is:
38AH074
3812 lb [1729 kg]
38AH074C
4229 lb [1918 kg]
38AH084
4057 lb [1840 kg]
38AH084C
4730 lb [2145 kg]
2. Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
LEGEND
MTG — Mounting
SAE — Society of Automotive Engineers
FIELD POWER SUPPLY CONNECTIONS
38AH Uunit
Diameter,
V-Ph-Hz
Qty
Size
in. [mm]
2
230-3-60
21/2 [63.5]
460-3-60
21/2 [63.5]
1
575-3-60
21/2 [63.5]
1
074
380-3-60
35/8 [92.0]
1
346-380/415-3-50
35/8 [92.0]
1
208/230-3-60
35/8 [92.0]
2
460-3-60
35/8 [92.0]
1
084
575-3-60
21/2 [63.5]
1
380-3-60
35/8 [92.0]
1
346-380/415-3-50
35/8 [92.0]
1
Fig. 4 — Dimensions — Units 38AH074,084
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
3. Mounting holes may be used to mount unit to concrete
pad. They are not recommended for mounting unit to
spring isolators. If spring isolators are used, a perimeter
support channel between the unit and the isolators is
recommended.
4. “C” in the package number indicates copper coils.
5. See Table 1 for rigging center of gravity (Dimensions X,Y).
See Tables 2A and 2B for A-D corner weights.
6. Circled numerals in Top View refer to condenser fans by
position.
(SEE CONNECTIONS TABLE)
SUCTION AND LIQUID LINES
Dual Circuit,
Single Circuit,
ft-in. [mm]
ft-in. [mm]
1
Suction Connection(s) 0-2 /8 [54]
0-25/8 [67]
Liquid Connection(s)
0-7/8
[22]
0-11/8 [29]
Suction C
2-11/16 [627]
1-105/16 [567]
Liquid D
1-101/16 [561]
1-105/16 [567]
Suction (Ckt A)
1-713/16 [503]
2-5/8
[626]
Suction (Ckt B)
2-5/8
[626]
—
Liquid (Ckt A)
2-53/4 [756]
2-111/8 [892]
Liquid (Ckt B)
2-105/8 [879]
—
Description
a38-7080
7
NOTES:
1.The approximate operating weight of the unit is:
38AH094 — 5088 lb [2308 kg]
38AH094C — 5813 lb [2637 kg]
2.Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
LEGEND
MTG — Mounting
SAE — Society of Automotive Engineers
Fig. 5 — Dimensions — Units 38AH094
3. Mounting holes may be used to mount unit to concrete pad. They
are not recommended for mounting unit to spring isolators. If
spring isolators are used, a perimeter support channel between
the unit and the isolators is recommended.
4. Two 35/8 [92 mm] diameter holes are recommended for parallel
conductors on 208/230-v units.
5. “C” in the package number indicates copper coils.
6. See Table 1 for rigging center of gravity (Dimensions X,Y). See
Tables 2A and 2B for A-D corner weights.
7. Numerals in Top View refer to condenser fans by position.
460-575-380-3-60
35/8 [92]
1
FIELD POWER SUPPLY CONNECTIONS
38AH
Diameter
V-Ph-Hz
Qty
Unit
in. [mm]
1
346-380/415-3-50
35/8 [92]
208/230-3-60
35/8 [92]
2
094
(SEE NOTE 4 AND CONNECTIONS TABLE)
a38-7081
8
2
1
1
Qty
NOTES:
1. The approximate operating weight of the unit is:
38AH-104--5435 lb [2465 kg]
38AH-104--C
6160 lb [2794 kg]
2. Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
LEGEND
MTG — Mounting
SAE — Society of Automotive Engineers
FIELD POWER SUPPLY CONNECTIONS
38AH Unit
Diameter,
V-Ph-Hz
Size
in. [mm]
208/230-3-60
35/8 [92.0]
380-460-575-3-60
35/8 [92.0]
104
346-380/415-3-50
35/8 [92.0]
Fig. 6 — Dimensions — Units 38AH104
3. Mounting holes may be used to mount unit to concrete pad. They are not recommended for mounting
unit to spring isolators. If spring isolators are used, a
perimeter support channel between the unit and the
isolators is recommended.
4. Two 35/8 in. [92-mm] diameter hole are recommended for parallel conductors on 208/230-v units.
5. “C” in the package number indicates copper coils.
6. See Table 1 for rigging center of gravity (Dimensions
X,Y). See Tables 2A and 2B for A-D corner weights.
7. Numerals in Top View refer to condenser fans by
position.
a38-7082
(SEE NOTE 4 AND CONNECTIONS TABLE)
9
2
1
1
2
1
1
Qty
NOTES:
1. The approximate operating weight of the unit is:
38AH124 — 7260 lb [3293 kg]
38AH124C — 8126 lb [3686 kg]
2. Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
3. Mounting holes may be used to mount unit to concrete pad. They
are not recommended for mounting unit to spring isolators. If
spring isolators are used, a perimeter support channel between
MTG —
SAE —
LEGEND
Mounting
Society of Automotive Engineers
FIELD POWER SUPPLY CONNECTIONS
38AH Unit
Diameter,
V-Ph-Hz
Size
in. [mm]
208/230-3-60
21/2 [63.5]
380-460-575-3-60
21/2 [63.5]
124A
346-380/415-3-50
35/8 [92.0]
208/230-3-60
21/2 [63.5]
380-460-575-3-60
21/2 [63.5]
124B
346-380/415-3-50
35/8 [92.0]
a38-7083
10.
6.
7.
8.
9.
5.
4.
Fig. 7 — Dimensions — Units 38AH124
the assembled unit and the isolators is required. Do not support
each module separately.
One 35/8 (92 mm) diameter hole is recommended for single
power entry into each module (124A and 124B) of the unit.
Each module must be rigged into position separately. The unit
must not be rigged after modules have been connected.
Suction and liquid connections can exit on either side of the unit.
Field power supply connections are required for each module.
“C” in the package number indicates copper coils.
See Table 1 for rigging center of gravity (Dimensions K,L,X,Y).
See Tables 2A and 2B for A-D corner weights.
Numerals in Top View refer to condenser fans by position.
(SEE NOTE 4 AND CONNECTIONS TABLE)
10
2
1
1
2
1
1
1
Qty
NOTES:
1. The approximate operating weight of the unit is:
38AH134 — 7507 lb [3405 kg]
38AH134C — 8357 lb [3791 kg]
2. Unit must have clearances for airflow as follows:
Top — Do not restrict in any way.
Ends — 5 ft [1524 mm]
Sides — 6 ft [1829 mm]
3. Mounting holes may be used to mount unit to concrete pad. They
are not recommended for mounting unit to spring isolators. If
MTG —
SAE —
LEGEND
Mounting
Society of Automotive Engineers
FIELD POWER SUPPLY CONNECTIONS
38AH Unit
Diameter,
V-Ph-Hz
Module
in. [mm]
208/230-3-60
21/2 [63.5]
380-460-575-3-60
21/2 [63.5]
134A
346-380/415-3-50
35/8 [92.0]
208/230-3-60
21/2 [63.5]
460-575-3-60
21/2 [63.5]
134B
380-3-60
35/8 [92.0]
346-380/415-3-50
35/8 [92.0]
a38-7084
10.
6.
7.
8.
9.
5.
4.
Fig. 8 — Dimensions — Units 38AH134
spring isolators are used, a perimeter support channel between
the assembled unit and the isolators is required. Do not support
each module separately.
One 35/8 in. [92 mm] diameter hole is recommended for single
power entry into the 134A (208/230-v) module of the unit. Single
power entry into the 134B module is not recommended.
Each module must be rigged into position separately. The unit
must not be rigged after modules have been connected.
Suction and liquid connections can exit on either side of the unit.
Field power supply connections are required for each module.
“C” in the package number indicates copper coils.
See Table 1 for rigging center of gravity (Dimensions K,L,X,Y).
See Tables 2A and 2B for A-D corner weights.
Numerals in Top View refer to condenser fans by position.
(SEE NOTE 4 AND CONNECTIONS TABLE)
Table 3A — Units 38AH044-084 Physical Data — 50/60 Hz (English)
38AH
OPERATING WEIGHT WITH
REFRIGERANT (Approx) — lb
SHIP WEIGHT WITH COIL PROTECTION ONLY
(Approx) — lb
REFRIGERANT*
Total Typical Operating Charge (Approx) — lb
Qty of Circuits
COMPRESSOR Type...rpm
(Qty Cylinder) Compressor†
Model No. 06E
(Qty Cylinder) Compressor†
Model No. 06E
Oil Charge (pt)
Cu-Al
Cu-Cu
044
3259
3547
054
3309
3597
Cu-Al
Cu-Cu
3250
3538
3290
3578
62
2
1
Std
Opt
Std
Std
Opt
Opt
Std
Opt
Capacity Control Steps**
CONDENSER FANS (6 Blade) — 60 Hz
Qty...Dia (in.)
Airflow (cfm)
Speed (rpm)
Total Power (kW)
CONDENSER FANS (6 Blade) — 50 Hz
Qty...Dia (in.)
Airflow (cfm)
Speed (rpm)
Total Power (kW)
CONDENSER COIL
Rows...Fins per in.
Face Area (sq ft)
Storage Capacity (lb per circuit) at 120 F
CONNECTIONS
Suction, ODF (in.)††
Liquid, ODF (in.)††
Hot Gas Bypass, ODF (in.)
(4) A1
250
(4) A1
250
17
17
(4) B1
250
(4) A2
250
17
17
064
3565
3998
074
3812
4229
3530
3780
3963
4197
R-22
72
88
104
2
2
2
1
1
1
Reciprocating Semi-Hermetic...1750 at 60 Hz; 1458 at 50 Hz
(4) A1
(6) B1
(6) A1
(6) B1
(6) A1
(6) B1
250
265
265
275
275
299
(6) A1
(4) A2
(6) A1
(6) A2
(6) A1
(6) A2
265
250
275
265
299
275
17
21
21
21
21
19
21
17
21
21
19
21
4
4...30
35,000
1140
6.2
4000
4678
130
2
1
(6) A1
299
(6) A1
299
19
19
(6) B1
299
(6) A2
299
19
19
6...30
52,000
51,000
1140
9.3
4...30
35,000
52,000
950
6.2
Enhanced Copper Tubes, Aluminum Lanced Fin
2...17
3...17
2...19
80.5
80.5
116.7
35
55
55
2...17
80.5
35
084
4057
4735
6...30
51,000
950
9.3
3...17
116.7
80
21/8
7/
8
5/8
Table 3B — Units 38AH044-084 Physical Data — 50/60 Hz (SI)
38AH
OPERATING WEIGHT WITH
REFRIGERANT (Approx) — kg
SHIP WEIGHT WITH COIL PROTECTION ONLY
(Approx) — kg
REFRIGERANT*
Total Typical Operating Charge (Approx) — kg
Qty of Circuits
COMPRESSOR Type...R/s
(Qty Cylinder) Compressor†
Model No. 06E
(Qty Cylinder) Compressor†
Model No. 06E
Oil Charge (L)
Capacity Control Steps**
CONDENSER FANS (6 Blade) — 50 Hz
Qty...Dia (mm)
Airflow (L/s)
Speed (r/s)
Total Power (kW)
CONDENSER FANS (6 Blade) — 60 Hz
Qty...Dia (mm)
Airflow (L/s)
Speed (r/s)
Total Power (kW)
CONDENSER COIL
Rows...Fins per m
Face Area (sq m)
Storage Capacity (kg per circuit) at 48.9 C
CONNECTIONS
Suction, ODF (in.)††
Liquid, ODF (in.)††
Hot Gas Bypass, ODF (in.)
Cu-Al
Cu-Cu
ODF
Opt
Std
—
—
—
—
—
Cu-Al
Cu-Cu
044
1478
1609
054
1501
1632
Cu-Al
Cu-Cu
1474
1605
1492
1623
Std
Opt
28.1
2
1
Std
Std
Opt
Opt
Std
Opt
(4) A1
250
(4) A1
250
8.0
8.0
(4) B1
250
(4) A2
250
8.0
8.0
064
1617
1813
074
1729
1918
1601
1715
1798
1904
R-22
32.7
39.9
47.2
2
2
2
1
1
1
Reciprocating Semi-Hermetic...29.2 at 60 Hz; 24.3 at 50 Hz
(4) A1
(6) B1
(6) A1
(6) B1
(6) A1
(6) B1
250
265
265
275
275
299
(6) A1
(4) A2
(6) A1
(6) A2
(6) A1
(6) A2
265
250
275
265
299
275
8.0
9.9
9.9
9.9
9.9
9.0
9.9
8.0
9.9
9.9
9.0
9.9
4
4...762
16,500
15.8
6.2
1814
2122
58.9
2
1
(6) A1
299
(6) A1
299
9.0
9.0
(6) B1
299
(6) A2
299
9.0
9.0
6...762
24,500
24,100
15.8
9.3
4...762
16,500
24,500
19.0
6.2
Enhanced Copper Tubes, Aluminum Lanced Fin
2...669
3...669
2...782
7.48
7.48
10.84
16
25
25
2...669
7.48
16
084
1840
2145
6...762
24,100
19.0
9.3
3...669
10.84
36
21/8
7/
8
5/
8
LEGEND
Copper Tubes with Aluminum Fins
Copper Tubes with Copper Fins
Outside Diameter, Female
Optional Single-Circuit Units
Standard Dual-Circuit Units
††For single-circuit units, suction ODF is 25/8 in. (66.7 mm) and liquid ODF is
11/8 in. (28.6 mm). Single circuits have a factory-installed manifold; no
field modification is required.
NOTES:
1. Certified dimensional drawings available on request.
2. Equivalent connection values in mm are as follows:
mm
in.
5/
15.9
8
7/
22.2
8
54.0
21/8
*Unit is factory supplied with nitrogen holding charge.
†Compressor A1 is lead on standard and optional single-circuit units.
**Capacity control steps listed are for constant-volume units with no accessories. Refer to page 48, Capacity Control, for additional system capacity
information.
11
Table 4A — Units 38AH094-134 Physical Data — 50/60 Hz (English)
38AH
094
104
OPERATING WEIGHT WITH
Cu-Al
REFRIGERANT (Approx) — lb
Cu-Cu
SHIP WEIGHT WITH
Cu-Al
COIL PROTECTION AND SKID
Cu-Cu
(Approx) — lb
REFRIGERANT†
Total Typical Operating Charge (Approx) — lb
Qty of Circuits
COMPRESSOR Type...rpm
(Qty Cylinder) Compressor**
Model No. 06E
Oil Charge (pt)
Capacity Control Steps††
CONDENSER FANS (6 Blade) — 60 Hz
Qty...Dia (in.)
Airflow (cfm)
Speed (rpm)
Total Power (kW)
CONDENSER FANS (6 Blade) — 50 Hz
Qty...Dia (in.)
Airflow (cfm)
Speed (rpm)
Total Power (kW)
CONDENSER COIL
Rows...Fins per in.
Face Area (sq ft)
Storage Capacity
(lb per circuit) at 120 F
CONNECTIONS
Suction, ODF (in.)
Liquid, ODF (in.)
Hot Gas Bypass, ODF (in.)
5088
5813
5630
6355
5435
6160
5990
6715
124
124A
3630*
4063*
3907*
4340*
134
124B
3630*
4063*
3907*
4340*
134A
3630*
4063*
3907*
4340*
134B
3877*
4294*
4080*
4497*
R-22
135
88
88
88
104
2
1
1
1
1
Reciprocating Semi-Hermetic...1750 at 60 Hz; 1460 at 50 Hz
(6)A1 (4)A2 (6)B1 (6)A1 (4)A2 (6)B1 (6)B2 (6)A1 (6)A2 (6)A1 (6)A2 (6)A1 (6)A2 (6)A1 (6)A2
–275 –250 –299 –265 –250 –265 –265 –275 –265 –275 –265 –275 –265 –299 –275
21
17
19
21
17
21
21
21
21
21
21
21
21
19
21
6
8
4
4
4
4
148
2
6...30
52,000
1140
9.4
6...30
52,000
1140
9.5
6...30
52,000
950
9.4
4...30
35,000
1140
6.4
4...30
35,000
1140
6.4
6...30
4...30
4...30
52,000
35,000
35,000
950
950
950
9.5
6.4
6.4
Enhanced Copper Tubes, Aluminum Lanced Fin
3...17
3...17
3...17
128.3
80.5
80.5
3...17
128.3
4...30
35,000
1140
6.4
6...30
52,000
1140
9.2
4...30
35,000
950
6.4
6...30
52,000
950
9.2
3...17
80.5
2...19
116.7
178
178
110
110
110
110
21/8
7/8
5/
8
21/8
7/8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
Table 4B — Units 38AH094-134 Physical Data — 50/60 Hz (SI)
38AH
094
104
OPERATING WEIGHT WITH
Cu-Al
REFRIGERANT (Approx) — kg
Cu-Cu
SHIP WEIGHT WITH
Cu-Al
COIL PROTECTION AND SKID
Cu-Cu
(Approx) — kg
REFRIGERANT†
Total Typical Operating Charge (Approx) — kg
Qty of Circuits
COMPRESSOR Type...R/s
(Qty Cylinder) Compressor**
Model No. 06E
Oil Charge (L)
Capacity Control Steps††
CONDENSER FANS (6 Blade) — 60 Hz
Qty...Dia (mm)
Airflow (L/s)
Speed (r/s)
Total Power (kW)
CONDENSER FANS (6 Blade) — 50 Hz
Qty...Dia (mm)
Airflow (L/s)
Speed (r/s
Total Power (kW)
CONDENSER COIL
Rows...Fins per m
Face Area (sq m)
Storage Capacity
(lb per circuit) at 49 C
CONNECTIONS
Suction, ODF (in.)
Liquid, ODF (in.)
Hot Gas Bypass, ODF (in.)
2308
2637
2554
2883
2465
2794
2717
3046
Cu-Al
Cu-Cu
ODF
124
124A
1647*
1843*
1860*
1968*
134
124B
1647*
1843*
1860*
1968*
134A
1647*
1843*
1860*
1968*
134B
1759*
1948*
1851*
1968*
R-22
61.2
39.9
39.9
39.9
47.2
2
1
1
1
1
Reciprocating Semi-Hermetic...29.2 at 60 Hz; 24.3 at 50 Hz
(6)A1 (4)A2 (6)B1 (6)A1 (4)A2 (6)B1 (6)B2 (6)A1 (6)A2 (6)A1 (6)A2 (6)A1 (6)A2 (6)A1 (6)A2
–275 –250 –299 –265 –250 –265 –265 –275 –265 –275 –265 –275 –265 –299 –275
10
8
9
10
8
10
10
10
10
10
10
10
10
9
10
5
6
3
3
3
3
67.1
2
6...762
24,544
19
9.4
6...762
24,544
19
9.5
6...762
24,544
15.8
9.4
4...762
16,520
19
6.4
4...762
16,520
19
6.4
6...762
4...762
4...762
24,544
16,520
16,520
15.8
15.8
15.8
9.5
6.4
6.4
Enhanced Copper Tubes, Aluminum Lanced Fin
3...669.3
3...669.3
3...669.3
11.9
7.5
7.5
3...669.3
11.9
4...762
16,520
19
6.4
6...762
24,544
19
9.2
4...762
16,520
15.8
6.4
6...762
24,544
15.8
9.2
3...669.3
7.5
2...781.6
10.8
81
81
50
50
50
50
21/8
7/
8
5/
8
21/8
7/
8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
25/8
11/8
5/
8
LEGEND
— Copper Tubes with Aluminum Fins
— Copper Tubes with Copper Fins
— Outside Diameter, Female
††Capacity control steps listed are for constant volume units with no accessories. Refer to page 48, Capacity Control, for additional system capacity
information.
NOTES:
1. Unit 38AH124 consists of one 124A module and one 124B module. Unit
38AH134 consists of one 134A module and one 134B module.
2. Certified dimensional drawings available on request.
3. Equivalent connection values in mm are as follows:
mm
in.
5/
15.9
8
7/
22.2
8
*Includes piping and trim kit.
†Unit is factory supplied with nitrogen holding charge.
**Compressors are shipped with minimum oil charge.
12
Fig. 9 — Modules 38AH124A or 134A — Shipping Locations of Piping
and Sheet Metal Trim Kit
CONTROL
BOX
SHEET METAL COVER
PANEL (REMOVED)
RIG
HERE
RIG
HERE
RIG
HERE
a38-7079
24-in. (610-mm)
SERVICE SPACE
RIG
HERE
Fig. 10 — Correct Placement of Modules Without Piping
and Sheet Metal Trim (Unit 38AH134 Shown)
13
FACTORYINSTALLED
SUCTION
LINE LOOP
Fig. 11 — Typical Module with Cover Panels Removed
38AH044-084, 124, 134
MOUNTING SPRINGS
SHIPMENT BOLTS
SHIPMENT BOLTS
38AH094,104
MOUNTING
BOLTS
MOUNTING
BOLTS
RAIL BOLT (3) (2 SHOWN)
RAIL BOLT (3) (2 SHOWN)
Fig. 12 — Outer View, Compressor Mounting
14
Install a field-supplied filter drier and sight glasses in
each refrigerant system. Select the filter drier for maximum
unit capacity and minimum pressure drop. Figure 13 (for
38AH044-084 dual-circuit and 38AH094-134 units) or Fig. 14
(for 38AH044-084 optional single-circuit units) shows required location of solenoid valves and recommended locations
for the filter driers and sight glasses. Complete the refrigerant
piping from the evaporator to the condenser before opening the
liquid and suction lines at the condenser.
Step 3 — Make Refrigerant Piping
Connections
CAUTION
The field-supplied liquid line solenoid valve must be
installed at the evaporator to avoid possible compressor
damage during unit operation. See Fig. 13 (for 38AH044084 dual-circuit and 38AH094-134 units) or Fig. 14 (for
38AH044-084 optional single-circuit units).
IMPORTANT:
underground.
Do
not
bury
refrigerant
Table 5 — Liquid Lift
piping
UNIT
38AH
044
054
064
074
084
094
104
124
134
The units have large suction lines to minimize friction losses. The units also have the ability to operate at low capacity.
Because of these capabilities, use special care with suction piping and suction risers to ensure proper compressor oil return
under all operating conditions. Maximum allowable vertical
separation between the condensing unit and the evaporator is
shown in Table 5. Size suction lines in accordance with
Tables 6A-9B and Fig. 15. Mount liquid line solenoid valve
just ahead of the TXVs (thermostatic expansion valves)
which will be mounted at the evaporator. See Fig. 13 (for
38AH044-084 dual-circuit and 38AH094-134 units) or Fig. 14
(for 38AH044-084 optional single-circuit units).
To achieve good mixing of the refrigerant leaving the evaporator suction header for proper sensing by the TXV bulb:
1. Install a minimum of two 90-degree elbows upstream
of the TXV bulb location. See Fig. 16 (for 38AH044084 dual-circuit and 38AH094-134 units) or Fig. 17
(for 38AH044-084 optional single-circuit units).
2. Locate the TXV bulb on a vertical riser, where possible. If a horizontal location is necessary, secure the
bulb at approximately the 4 o’clock position.
3. Size the suction line from the evaporator to the common suction line to achieve high refrigerant velocity.
See Tables 6A-9B and Fig. 15.
If an oil return connection at the bottom of the suction header is supplied with an evaporator, tee-in this connection ahead
of first mixing elbow. See Fig. 16 (for 38AH044-084 dualcircuit and 38AH094-134 units) or Fig. 17 (for 38AH044-084
optional single-circuit units). When the compressor is below
the evaporator, the riser at the evaporator should extend to the
top of the evaporator section. After the riser is installed, the
suction line can elbow down immediately.
ft
69
75
75
45
75
55
50
75
45
MAXIMUM LIQUID LIFT
60 Hz
50 Hz
m
ft
21.0
57.5
23.0
75.0
23.0
65.0
13.7
37.5
23.0
75.0
16.7
46.0
15.2
42.0
23.0
65.0
13.7
37.5
m
17.5
23.0
19.8
11.4
23.0
14.0
12.8
19.8
11.4
CAUTION
System is factory charged with nitrogen. Relieve pressure
before connecting pipe. Failure to do so could result in personal injury.
IMPORTANT: Protect the liquid valves from the heat of
brazing.
Do not remove the run-around loop from the suction and
liquid line stubs until the piping connections are ready to be
made (see Fig. 18). Relieve the factory-supplied nitrogen
charge. Uncap the suction line and cut the run-around loop at
the liquid line as close to the loop elbow as possible. This will
leave approximately 2 in. (50 mm) of straight tube for liquid
line connection.
For 38AH124 and 134 units, see Piping Kit Connections on
page 22.
LEGEND
LLS — Liquid Line Solenoid
TXV — Thermostatic Expansion Valve
*Field-Supplied.
Fig. 13 — Required Location of Solenoid Valves and Recommended Filter Drier and
Sight Glass Locations for 38AH044-084 Dual-Circuit and 38AH094-134 Units
15
*Field-Supplied.
Fig. 14 — Required Location of Solenoid Valves and Recommended Filter Drier and
Sight Glass Locations for 38AH044-084 Optional Single-Circuit Units
A
B
C
D
RED.
STR
—
—
—
—
—
—
LEGEND
Pipe A, Suction Riser, without Trap
Pipe B, Suction Riser with Trap
Suction Line to Condensing Unit
Pipe D, Suction Riser Short Lift
Reducer
Street
UNIT
38AH
044
054
064
074
084
094, 104
124, 134
NOTES:
1. Short riser, pipe D, is used when routing suction line to condensing unit connection. See table at right.
2. See Tables 6A-9B for values of A, B, and C.
PIPE D DIAMETER
Dual Circuit*
Single Circuit*
A
B
in.
mm
in.
mm
in.
mm
41
1 5 /8
41
21/8
54
1 5 /8
41
1 5 /8
41
21/8
54
15 / 8
15 / 8
41
2 1 /8
54
21/8
54
21 / 8
54
2 1 /8
54
21/8
54
54
2 1 /8
54
25/8†
67†
21 / 8
21 / 8
54
2 1 /8
54
—
—
25/8
67
2 5 /8
67
—
—
*Maximum length of riser is 3 ft (914 mm).
†Double suction riser required if accessory unloader is field
installed.
Fig. 15 — Double Suction Riser Construction
16
Table 6A — Refrigerant Piping Requirements — 38AH044-104 Dual-Circuit Units — 60 Hz
UNIT
38AH
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
044
054
064
074
084
094
104
15-25
(4.6-7.6)
L
S
5/
1 5 /8
8
5 /8
1 5 /8
5/
1 5 /8
8
7/
1 5 /8
8
7 /8
1 5 /8
7/
2 1 /8
8
7/
2 1 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
7/
2 1 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
7/
2 1 /8
8
7 /8
2 1 /8
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
25-50
50-75
75-100
100-150
(7.6-15.2)
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
L
S
L
S
L
S*
L
S*
7/
7/
7/
7/
1 5 /8
21/8
2 1 /8
2 1 /8
8
8
8
8
7 /8
7 /8
7 /8
7 /8
1 5 /8
21/8
2 1 /8
2 1 /8
7/
7/
7/
7/
1 5 /8
21/8
2 1 /8
2 1 /8
8
8
8
8
7/
7/
2 1 /8
21/8
1 1 /8
2 1 /8
1 1 /8
2 1 /8
8
8
7 /8
7
7
1
1
1
1
2 /8
/8
2 /8
/8
2 /8
1 /8
2 1 /8
7/
7/
2 1 /8
21/8
1 1 /8
2 1 /8
1 1 /8
2 5 /8
8
8
1/
1/
1/
1/
1/
7/
7/
2
2
1
2
1
25/8**
8
8
8
8
8
8
8
1 1 /8
2 1 /8
1 1 /8
21/8
1 1 /8
2 5 /8
1 3 /8
2 5 /8
1 1 /8
2 1 /8
1 1 /8
21/8
1 1 /8
25/8**
1 3 /8
25/8**
1 1 /8
2 1 /8
1 1 /8
21/8
1 1 /8
2 5 /8
1 3 /8
2 5 /8
1 1 /8
2 1 /8
1 1 /8
25/8**
1 1 /8
25/8**
1 3 /8
25/8**
7/
2 1 /8
1 1 /8
21/8
1 1 /8
2 5 /8
1 1 /8
2 5 /8
8
1
1
1
5
1
5
3
1 /8
2 /8
1 /8
2 /8**
1 /8
2 /8**
1 /8
25/8**
1 1 /8
2 1 /8
1 1 /8
25/8
1 1 /8
2 5 /8
1 3 /8
31/8††
LEGEND
L — Liquid Line
S — Suction Line
150-200
(45.7-61.0)
L
S*
7/
2 1 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
1 1 /8
2 5 /8 †
1
1 /8
25/8**
1 1 /8
2 5 /8
1 1 /8
25/8**
1 3 /8
2 5 /8
1 3 /8
25/8**
1 3 /8
2 5 /8
1 3 /8
31/8††
1 3 /8
2 5 /8
3
1 /8
31/8††
1 3 /8
31/8††
4. Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
5. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher pressure
drop design criteria may allow selection of smaller pipe sizes,
but at a penalty of decreased system capacity and efficiency.
6. Double suction risers may be required if condensing unit is elevated above the evaporator. See footnotes and double suction
riser table below.
7. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
8. All pipe sizes are OD inches. Equivalent sizes in millimeters
follow:
*Field-supplied suction accumulators (P/N 38AK500410 qty 2) are
required on constant volume 38AH044-084 units if lineal length of
refrigerant piping exceeds 75 ft.
†Double suction riser required on units with field-installed unloader
on circuit B compressor if condensing unit is elevated above
evaporator.
**Double suction riser required on units with field-installed unloader
on circuit B compressor if condensing unit is elevated above
evaporator.
††Double suction riser required on all unit configurations if condensing unit is elevated above evaporator.
in.
5/
8
7/8
11/8
13/8
15/8
21/8
25/8
31/8
NOTES:
1. Addition of 2 unloaders to circuit B compressor is not
recommended.
2. 38AH094 and 38AH104 piping sizes apply only to factory supplied unit configurations. They do NOT take into account any
field-installed unloaders.
3. Piping sizes are based on unit operation above 40 F (4.4 C)
saturated suction temperature (SST). When operating below
40 F (4.4 C), refer to Carrier System Design Manual, E20-II®
piping design program, or ASHRAE Handbook to select proper
line sizes.
mm
15.9
22.2
28.6
34.9
41.3
54.0
66.7
79.4
Table 6B — Refrigerant Piping Requirements for Double Suction Risers,
38AH054-104 Dual-Circuit Units — 60 Hz
UNIT
38AH
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
054
064
074
084
094
104
—
Pipe A
Pipe B
Pipe C
—
—
—
—
A
—
—
—
—
—
—
—
—
1 5 /8
—
1 3 /8
—
50-75
(15.2-22.9)
B
—
—
—
—
—
—
—
—
2 1 /8
—
2 1 /8
—
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
75-100*
100-150*
(22.9-30.5)
(30.5-45.7)
C
A
B
C
A
B
C
A
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
15/8
—
—
—
—
—
—
—
1 5 /8
—
—
—
—
—
—
—
—
2 1 /8
2 5 /8
1 5 /8
—
—
—
—
1 5 /8
—
—
—
—
—
—
—
—
21/8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
15/8
—
—
—
—
—
—
—
—
25/8
15/8
21/8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
—
—
—
—
—
—
—
25/8
13/8
21/8
2 5 /8
1 3 /8
2 1 /8
2 5 /8
1 5 /8
—
—
—
—
1 3 /8
2 5 /8
3 1 /8
1 5 /8
LEGEND
Not Required
Suction Riser Without Trap
Suction Riser With Trap
Suction Line to Condensing Unit
150-200*
(45.7-61.0)
B
—
2 1 /8
2 1 /8
—
2 1 /8
—
2 1 /8
—
2 5 /8
—
2 5 /8
2 5 /8
C
—
2 5 /8
2 5 /8
—
2 5 /8
—
2 5 /8
—
3 1 /8
—
3 1 /8
3 1 /8
2. Pipe sizes are based on the total linear length, shown for each
column, plus a 50% allowance for fittings.
3. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher design
pressure drop criteria may allow selection of smaller pipe sizes
but at a penalty of decreased system capacity and efficiency.
4. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
5. All pipe sizes are OD inches. See Table 6A notes for metric
equivalents.
6. Refer to Fig. 15 for double suction riser construction.
*Field-supplied suction accumulators (P/N 38AK500410 qty 2) are
required on constant volume 38AH044-084 units if lineal length of
refrigerant piping exceeds 75 ft.
NOTES:
1. See Table 6A at top of page to determine need for double suction risers.
17
Table 7A — Refrigerant Piping Requirements, 38AH044-104 Dual-Circuit Units — 50 Hz
UNIT
38AH
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
044
054
064
074
084
094
104
15-25
(4.6-7.6)
L
S
5/
1 3 /8
8
5 /8
1 3 /8
5/
1 3 /8
8
7/
1 5 /8
8
7 /8
1 5 /8
7/
1 5 /8
8
7/
1 5 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
7/
2 1 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
7/
2 1 /8
8
7 /8
2 1 /8
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
25-50
50-75
75-100
100-150
(7.6-15.2)
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
L
S
L
S
L
S*
L
S*
7/
7/
7/
7/
1 5 /8
15/8
21/8
2 1 /8
8
8
8
8
7 /8
7 /8
7 /8
7 /8
1 5 /8
15/8
21/8
2 1 /8
7/
7/
7/
7/
1 5 /8
15/8
21/8
2 1 /8
8
8
8
8
7/
7/
7/
1 5 /8
21/8
21/8
1 1 /8
2 1 /8
8
8
8
7 /8
7
5
1
7
1
1
1 /8
/8
2 /8**
/8
2 /8**
1 /8
21/8**
7/
7/
7/
2 1 /8
21/8
21/8
1 1 /8
25/8†
8
8
8
1/
1/
1/
1/
7/
7/
7/
2
2
2
1
25/8**
8
8
8
8
8
8
8
7 /8
2 1 /8
1 1 /8
21/8
1 1 /8
25/8
1 1 /8
2 5 /8
7/
2 1 /8
1 1 /8
21/8
1 1 /8
25/8**
1 1 /8
25/8**
8
7/
2 1 /8
1 1 /8
21/8
1 1 /8
25/8
1 1 /8
2 5 /8
8
1 1 /8
2 1 /8
1 1 /8
25/8††
1 1 /8
25/8††
1 1 /8
25/8**
7/
2 1 /8
1 1 /8
21/8
1 1 /8
25/8†**
11 / 8
25/8†**
8
1
1
1
1
5
1
7/
2 /8
1 /8
2 /8
1 /8
2 /8††
1 /8
25/8††
8
1 1 /8
2 1 /8
1 1 /8
25/8
1 1 /8
25/8
1 3 /8
2 5 /8
LEGEND
L — Liquid Line
S — Suction Line
150-200
(45.7-61.0)
L
S*
7/
2 1 /8
8
7 /8
2 1 /8
7/
2 1 /8
8
1 1 /8
25/8†**
1
1 /8
25/8††
1 1 /8
2 5 /8 †
1 1 /8
25/8**
1 1 /8
2 5 /8
1 1 /8
25/8**
1 1 /8
2 5 /8
1 3 /8
31/8††
11/8
25/8†**
3
1 /8
31/8††
1 3 /8
31/8††
4. Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
5. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher pressure
drop design criteria may allow selection of smaller pipe sizes,
but at a penalty of decreased system capacity and efficiency.
6. Double suction risers may be required if condensing unit is elevated above the evaporator. See footnotes and double suction
riser table below.
7. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
8. All pipe sizes are OD inches. Equivalent sizes in millimeters
follow:
*Field-supplied suction accumulators (P/N 38AK500410 qty 2) are
required on constant volume 38AH044-084 units if lineal length of
refrigerant piping exceeds 75 ft.
†Double suction riser required on units with field-installed unloader
on circuit B compressor if condensing unit is elevated above
evaporator.
**Double suction riser required on units with field-installed unloader
on circuit B compressor if condensing unit is elevated above
evaporator.
††Double suction riser required on all unit configurations if condensing unit is elevated above evaporator.
in.
5/
8
7/
8
1
1 /8
3
1 /8
15/8
21/8
25/8
31/8
NOTES:
1. Addition of 2 unloaders to circuit B compressor is not
recommended.
2. 38AH094 and 38AH104 piping sizes apply only to factory supplied unit configurations. They do NOT take into account any
field-installed unloaders.
3. Piping sizes are based on unit operation above 40 F (4.4 C)
saturated suction temperature (SST). When operating below
40 F (4.4 C), refer to Carrier System Design Manual, E20-II®
piping design program, or ASHRAE Handbook to select proper
line sizes.
mm
15.9
22.2
28.6
34.9
41.3
54.0
66.7
79.4
Table 7B — Refrigerant Piping Requirements for Double Suction Risers,
38AH054-104 Dual-Circuit Units — 50 Hz
UNIT
38AH
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
Ckt A
Ckt B
054
064
074
084
094
104
—
Pipe A
Pipe B
Pipe C
—
—
—
—
A
—
—
1 3 /8
—
—
—
—
—
1 3 /8
—
—
—
50-75
(15.2-22.9)
B
—
—
1 5 /8
—
—
—
—
—
2 1 /8
—
—
—
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
75-100*
100-150*
(22.9-30.5)
(30.5-45.7)
C
A
B
C
A
B
C
A
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
15/8
21/8
13/8
15/8
21/8
1 5 /8
1 5 /8
2 5 /8
1 5 /8
—
—
—
—
1 5 /8
2 1 /8
2 5 /8
1 5 /8
5
1
5
—
—
—
—
1 /8
2 /8
2 /8
1 5 /8
—
—
—
—
—
—
—
—
21/8
25/8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
15/8
—
—
—
—
—
—
—
—
25/8
13/8
21/8
25/8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
13/8
21/8
25/8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
13/8
21/8
25/8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
—
—
—
—
—
—
—
1 5 /8
LEGEND
Not Required
Suction Riser Without Trap
Suction Riser With Trap
Suction Line to Condensing Unit
150-200*
(45.7-61.0)
B
—
2 1 /8
2 1 /8
2 1 /8
2 1 /8
—
2 1 /8
—
2 5 /8
2 1 /8
2 5 /8
2 5 /8
C
—
2 5 /8
2 5 /8
2 5 /8
2 5 /8
—
2 5 /8
—
3 1 /8
2 5 /8
3 1 /8
3 1 /8
2. Pipe sizes are based on the total linear length, shown for each
column, plus a 50% allowance for fittings.
3. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher design
pressure drop criteria may allow selection of smaller pipe sizes
but at a penalty of decreased system capacity and efficiency.
4. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
5. All pipe sizes are OD inches. See Table 7A notes for metric
equivalents.
6. Refer to Fig. 15 for double suction riser construction.
*Field-supplied suction accumulators (P/N 38AK500410 qty 2) are
required on constant volume 38AH044-084 units if lineal length of
refrigerant piping exceeds 75 ft.
NOTES:
1. See Table 7A at top of page to determine need for double suction risers.
18
Table 8A — Refrigerant Piping Requirements for 38AH044-084 Optional Single-Circuit Units and
38AH124,134 Modular Units (Dual-Circuit) — 60 Hz
UNIT
38AH
044
054
064;
Modules 124A,
124B,134A
074;
Module 134B
084
CV
L
S
VAV
—
—
—
—
15-20
(4.6-6.1)
L
S
7/
2 1 /8
8
7/
2 1 /8
8
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
20-50
50-75
75-100
100-150
(6.1-15.2)
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
L
S
L
S
L
S
L
S
7/
2 1 /8
1 1 /8
2 1 /8
1 1 /8
2 5 /8 *
13/8
2 5 /8 *
8
1 1 /8
2 5 /8
1 1 /8
2 5 /8
1 1 /8
2 5 /8
13/8
3 1 /8 *
150-200
(45.7-61.0)
L
S
1 3 /8
3 1 /8 *
1 3 /8
3 1 /8 *
1 1 /8
2 1 /8
1 1 /8
2 5 /8 †
1 1 /8
2 5 /8 †
1 3 /8
3 1 /8 *
13/8
3 1 /8 *
1 3 /8
3 1 /8 *
1 1 /8
2 1 /8
1 1 /8
2 5 /8 †
1 3 /8
3 1 /8 †
1 3 /8
3 1 /8 †
13/8
3 1 /8 †
1 5 /8
3 5 /8 *
1 1 /8
2 5 /8 †
1 1 /8
2 5 /8 †
1 3 /8
3 1 /8 †
1 3 /8
3 1 /8 †
15/8
3 5 /8 †
1 5 /8
3 5 /8 *
LEGEND
Constant Volume
Liquid Line
Suction Line
Variable Air Volume
4. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher pressure
drop design criteria may allow selection of smaller pipe sizes,
but at a penalty of decreased system capacity and efficiency.
5. Double suction risers may be required if condensing unit is elevated above the evaporator. See footnotes and double suction
riser table below.
6. Refer to Carrier System Design Manual, E20-II design program,
or ASHRAE Handbook for further information on selecting pipe
sizes for split systems.
7. All pipe sizes are OD inches. Equivalent sizes in millimeters
follow:
*Double suction riser required on all units configurations if condensing unit is elevated above evaporator.
†Double suction riser required on units with factory-installed VAV
option or CV units with additional field-installed unloader on circuit
A1 (lead) compressor if condensing unit is elevated above
evaporator.
in.
7/
8
11/8
3
1 /8
15/8
21/8
25/8
31/8
35/8
NOTES:
1. Addition of field-installed unloaders on A2 (lag) compressor is
not recommended.
2. Piping sizes are based on unit operation above 40 F (4.4 C)
saturated suction temperature (SST). When operating below
40 F (4.4 C), refer to Carrier System Design Manual, E20-II®
piping design program, or ASHRAE Handbook to select proper
line sizes.
3. Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
mm
22.2
28.6
34.9
41.3
54.0
66.7
79.4
92.1
Table 8B — Refrigerant Piping Requirements for Double Suction Risers,
38AH044-084 Optional Single-Circuit Units and 38AH124,134
Modular Units (Dual-Circuit) — 60 Hz
044
15-50
(4.6-15.2)
A
B
C
—
—
—
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
50-75
75-100
100-150
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
A
B
C
A
B
C
A
B
C
—
—
—
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
054
—
—
—
—
—
—
—
—
—
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
064;
Modules 124A,
124B,134A
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
074;
Module 134B
15/8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
2 1 /8
3 1 /8
3 5 /8
084
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
2 1 /8
3 1 /8
3 5 /8
2 1 /8
3 1 /8
3 5 /8
UNIT
38AH
—
Pipe A
Pipe B
Pipe C
—
—
—
—
LEGEND
Not Required
Suction Riser Without Trap
Suction Riser With Trap
Suction Line to Condensing Unit
150-200
(45.7-61.0)
A
B
C
1 5 /8
2 5 /8
3 1 /8
3. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher design
pressure drop criteria may allow selection of smaller pipe sizes
but at a penalty of decreased system capacity and efficiency.
4. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
5. All pipe sizes are OD inches. See Table 8A notes for metric
equivalents.
6. Refer to Fig. 15 for double suction riser construction.
NOTES:
1. See Table 8A at top of page to determine need for double suction risers.
2. Pipe sizes are based on the total linear length, shown for each
column, plus a 50% allowance for fittings.
19
Table 9A — Refrigerant Piping Requirements for 38AH044-084 Optional Single-Circuit Units and
38AH124,134 Modular Units (Dual Circuit) — 50 Hz
UNIT
38AH
044
054
064;
Modules 124A,
124B,134A
074;
Module 134B
084
CV
L
S
VAV
—
—
—
—
15-20
(4.6-6.1)
L
S
7/
2 1 /8
8
7/
2 1 /8
8
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
20-50
50-75
75-100
100-150
(6.1-15.2)
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
L
S
L
S
L
S
L
S
7/
2 1 /8
1 1 /8
2 1 /8
1 1 /8
2 5 /8 *
11/8
2 5 /8 *
8
1 1 /8
2 1 /8
1 1 /8
2 5 /8 *
1 1 /8
2 5 /8 *
11/8
2 5 /8 *
150-200
(45.7-61.0)
L
S
1 3 /8
2 5 /8 *
1 3 /8
3 1 /8 *
7/
8
2 1 /8
1 1 /8
2 5 /8 †
1 1 /8
2 5 /8 †
1 1 /8
2 5 /8 †
13/8
3 1 /8 *
1 3 /8
3 1 /8 *
7/
8
2 1 /8
1 1 /8
2 5 /8 †
1 1 /8
2 5 /8 †
1 3 /8
3 1 /8 *
13/8
3 1 /8 *
1 3 /8
3 1 /8 *
2 1 /8
1 1 /8
2 5 /8 †
1 3 /8
3 1 /8 *
1 3 /8
3 1 /8 *
13/8
3 1 /8 *
1 5 /8
3 5 /8 *
1 1 /8
LEGEND
Constant Volume
Liquid Line
Suction Line
Variable Air Volume
4. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher pressure
drop design criteria may allow selection of smaller pipe sizes,
but at a penalty of decreased system capacity and efficiency.
5. Double suction risers may be required if condensing unit is elevated above the evaporator. See footnotes and double suction
riser table below.
6. Refer to Carrier System Design Manual, E20-II design program,
or ASHRAE Handbook for further information on selecting pipe
sizes for split systems.
7. All pipe sizes are OD inches. Equivalent sizes in millimeters
follow:
*Double suction riser required on all units configurations if condensing unit is elevated above evaporator.
†Double suction riser required on units with factory-installed VAV
option or CV units with additional field-installed unloader on circuit
A1 (lead) compressor if condensing unit is elevated above
evaporator.
in.
7/
8
11/8
3
1 /8
15/8
21/8
25/8
31/8
35/8
NOTES:
1. Addition of field-installed unloaders on A2 (lag) compressor is
not recommended.
2. Piping sizes are based on unit operation above 40 F (4.4 C)
saturated suction temperature (SST). When operating below
40 F (4.4 C), refer to Carrier System Design Manual, E20-II®
piping design program, or ASHRAE Handbook to select proper
line sizes.
3. Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
mm
22.2
28.6
34.9
41.3
54.0
66.7
79.4
92.1
Table 9B — Refrigerant Piping Requirements for Double Suction Risers,
38AH044-084 Optional Single-Circuit Units and 38AH124,134
Modular Units (Dual Circuit) — 50 Hz
044
15-20
(4.6-6.1)
A
B
C
—
—
—
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — ft (m)
20-50
50-75
75-100
100-150
(6.1-15.2)
(15.2-22.9)
(22.9-30.5)
(30.5-45.7)
A
B
C
A
B
C
A
B
C
A
B
C
—
—
—
—
—
—
15/8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
2 5 /8
054
—
—
—
—
—
—
15/8
2 1 /8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
064;
Modules 124A,
124B,134A
—
—
—
15/8
2 1 /8
2 5 /8
15/8
2 1 /8
2 5 /8
1 5 /8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
074;
Module 134B
—
—
—
15/8
2 1 /8
2 5 /8
15/8
2 1 /8
2 5 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
3 1 /8
3 5 /8
084
—
—
—
15/8
2 1 /8
2 5 /8
15/8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
2 5 /8
3 1 /8
1 5 /8
3 1 /8
3 5 /8
UNIT
38AH
—
Pipe A
Pipe B
Pipe C
—
—
—
—
LEGEND
Not Required
Suction Riser Without Trap
Suction Riser With Trap
Suction Line to Condensing Unit
150-200
(45.7-61.0)
A
B
C
1 5 /8
2 5 /8
2 5 /8
3. Suction and liquid line sizing is based on pressure drop equivalent to 2 F (1.1 C) at nominal rating conditions. Higher design
pressure drop criteria may allow selection of smaller pipe sizes
but at a penalty of decreased system capacity and efficiency.
4. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split
systems.
5. All pipe sizes are OD inches. See Table 9A notes for metric
equivalents.
6. Refer to Fig. 15 for double suction riser construction.
NOTES:
1. See Table 9A at top of page to determine need for double suction risers.
2. Pipe sizes are based on the total linear length, shown for each
column, plus a 50% allowance for fittings.
20
LEGEND
TXV — Thermostatic Expansion Valve
TYP — Typical
NOTE: Lower split first on, last off.
Fig. 16 — Typical Piping Connections for Face Split Coils for 38AH044-084 Dual-Circuit
and 38AH094-134 Units
LEGEND
TXV — Thermostatic Expansion Valve
TYP — Typical
NOTE: Lower split first on, last off.
Fig. 17 — Typical Piping Connections for Face Split Coils for 38AH044-084
Optional Single-Circuit Units
21
post on module 134B. See Fig. 21. Top cover is in 2 pieces: one
vertical piece and one horizontal piece. Slide vertical top cover
partly under module 134B end cover flange; align holes and reinsert screws B. Place horizontal cover on top of module 134A
end cover with opposite side resting on the horizontal flange of
the installed module B vertical top cover piece. Align holes on
flange and top cover. Reinsert screws A through the top cover
holes into the end cover. From within the service space, insert
supplied screws up through the flange and horizontal cover to
make a secure connection between the horizontal and vertical
cover pieces.
Insert supplied screws into each of the 2 holes in the vertical
side flange of the top cover at each end of the service space.
Attach Side Panels — Insert side panels at the ends of the
service space and hook side panel flange over the 2 screws previously inserted in the top cover flange. Fasten panels to the
corner posts with supplied self-drilling screws. See Fig. 22.
CONNECT TUBING FROM EVAPORATOR TO CONDENSING UNIT
Fig. 18 — Factory-Installed Suction Line Loop
UNITS 38AH024-134
Piping Kit Connections — The 38AH124 and 134 units are
delivered with a factory-supplied suction and liquid piping kit
for installation in the 24-in. (610-mm) service space between
the 2 unit modules. The piping kit allows for a common unit
side piping connection from the indoor unit to each of the condensing unit refrigeration circuits. Fittings are provided and
shipped in the control box.
Remove the copper tubes from module 124A or 134A compressor rails. Save the pipe clamps for later use. Cut the 25/8-in.
(67-mm) suction tube into 2 pieces: 28 in. (711 mm) and 67 in.
(1702 mm). Connect the 2 formed 11/8-in. (29-mm) tubes to the
liquid line connection at the liquid valve. See Fig. 19.
NOTE: Piping kit is designed to allow air handler connections
to project from either side of the service space.
To prepare condensing unit modules for piping connection,
refer to beginning paragraphs of Step 3 — Make Refrigerant
Piping Connections, page 15.
Two 25/8-in. (67-mm) and one 11/8-in. (29-mm) elbows are
supplied for piping connections. Fit tubing to ensure proper installation. All tubes should have equal lengths projecting beyond unit corner posts. See Fig. 19. Ensure suction tube is level
for oil return requirements.
CAUTION
Protect liquid valves from the heat of brazing. Failure to
comply may result in equipment damage.
Braze the liquid and suction lines from the evaporator to the
condensing unit liquid and suction lines. Pass nitrogen or other
inert gas through the piping while brazing to prevent the formation of copper oxide. Leak test the entire system by the pressure
method described in the Carrier Refrigerant Service Techniques Manual. Use R-22 at approximately 25 psig (172 kPa)
backed up with an inert gas to a total pressure not to exceed
245 psig (1689 kPa). Purge nitrogen or reclaim R-22 from system after completion of leak-checking procedure. Repair leak
if one is found. When finished, evacuate and dehydrate system
using the methods described in Carrier GTAC II (General
Training Air Conditioning II), Module 4, System Dehydration.
CAUTION
Protect liquid valves from the heat of brazing. Failure to
comply may result in equipment damage.
Braze the piping connections.
Level the tubes and clamp to the corner posts with factorysupplied self-drilling screws and pipe clamps removed from
module 124A or 134A during piping kit removal.
Sheet Metal Trim Kit Installation— After the units are in
place and the piping kit is installed, install the sheet metal trim
kit.
NOTE: Install sheet metal trim kit before connection to air
handler tubing in case the modules must be repositioned to
accommodate the sheet metal installation.
Remove two 43-in. (1092 mm) base rail trim pieces from
module 124A or 134A base rail. Remove the 3 corner post
bolts from the bottom of each corner post at the service space.
Align the base rail trim piece holes over the bolt holes in the
corner rails. See Fig. 20. Reinsert corner post bolts through the
trim piece into the corner posts.
Attach Top Cover — To attach top cover, proceed as follows:
For Unit 38AH124, remove screws A from top of each of 4
corner posts at service space. See Fig. 21. Place cover on top of
service space and align top cover slots with corner post screw
holes. Reinsert screws A.
For Unit 38AH134, remove screws A from top of each corner
post on module 134A and screws B from top of each corner
NOTES:
1. Ensure suction tube is level for oil return requirements.
2. Protect liquid valves from heat of brazing.
Fig. 19 — Units 38AH124 and 134 with Installed
Piping Kit
22
MODULE CORNER
124B
POST (4 PER
OR 134B MODULE)
BASE RAIL
BOLTS (6)
SCREWS (2)
FOR
MOUNTING
SIDE PANEL
CORNER TOP
POST
COVER
(4 PER
FLANGE
MODULE)
MODULE
134A
OR 134A
CORNER
POST
CORNER POST
Fig. 20 — Units 38AH124 and 134 with Installed Trim
Kit Rails
SCREWS B
END COVER
FLANGES
CORNER
POST
FACTORY-SUPPLIED
SELF-DRILLING
SCREWS (4 PER
CORNER POST)
TOP COVER, SCREWS A
TOP COVER,
HORIZONTAL
VERTICAL
PIECE
PIECE
VERTICAL
TOP COVER
END COVER
FLANGE
(HIDDEN)
MODULE 124B 24-in. (610-mm)
SERVICE WAY
OR 134B
CORNER
POST
24-in. (610-mm)
SERVICEWAY
Fig. 22 — Fully Assembled Piping and Trim Kit
(Unit 38AH134 Shown)
MODULE 124A
OR 134A
Fig. 21 — Units 38AH124 and 134 with Installed Top
Cover (Unit 38AH134 Shown)
23
All field power enters the unit through a hole in the control
box shelf. Refer to Fig. 23-31 for field wiring details.
MAIN POWER — Units 38AH044-104 have single-point
power connection to simplify field-power wiring (all power
enters at one end). Units 38AH124 and 134 require 2 connection points, one for each module. Units may use copper,
copper-clad aluminum, or aluminum conductors at all voltages.
The maximum wire size units can accept per terminal block is
500 kcmil.
Power must be supplied as shown in Table 15.
CONTROL CIRCUIT WIRING — Control circuit wiring is
accomplished with a step-down transformer on voltage designations 500, 600, and 100. See Table 13 for control circuit information. For 208/230-v, 3-ph, 60-Hz units, ensure that the
transformer primary is wired properly for the voltage which
will be applied. All control wiring must comply with applicable local and national codes. The safety circuits are 24 v on all
units. The safety circuit voltage is created with a step-down
transformer where main control voltage is the transformer primary voltage.
Step 4 — Make Electrical Connections
POWER SUPPLY — Electrical characteristics of available
power supply must agree with unit nameplate rating. Supply
voltage must be within the limits shown in Tables 10A-12. See
Table 13 for control circuit data and Table 14 for fan motor
electrical data.
IMPORTANT: Operation of unit on improper supply
voltage or with excessive phase imbalance constitutes
abuse and can affect any Carrier warranty.
FIELD POWER CONNECTIONS — All power wiring must
comply with applicable local and national codes. Install fieldsupplied, branch circuit safety disconnect(s) of a type that
can be locked off/open. Disconnects must be located within
sight of, and readily accessible from, the unit in compliance
with NEC (National Electrical Code) (U.S.A. Standard)
Article 440-14.
Table 10A — Electrical Data — 50/60 Hz (38AH044-084 Dual-Circuit Units)
38AH
044
054
064
074
084
Voltage
Designation
500
800 (PW)
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
Compressor
A1/B1
Model No.
06E4250/250
06E4250/265
06E8265/275
06E8275/299
06E8299/299
STANDARD UNIT
Supply Voltage†
Nameplate
V-Ph-Hz
Min
Max
208/230-3-60
230-3-50
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
187
198
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
254
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
See page 25 for Legend and Notes.
24
COMPRESSOR*
A1
B1
MCA
MOCP
ICF
177.0
179.0
92.6
93.5
90.7
90.1
78.4
204.3
107.0
107.1
101.9
101.3
88.0
246.4
129.8
126.9
114.9
114.3
100.6
327.2
179.6
174.5
148.2
147.4
132.2
368.2
205.3
200.7
166.8
166.0
148.9
225
225
125
125
125
110
100
250
150
150
125
125
110
350
175
175
150
150
125
450
250
250
200
200
175
500
250
250
225
225
200
434.7
296.7
165.9
241.2
219.6
218.6
162.4
535.7
198.9
297.2
269.6
268.6
206.4
617.5
230.5
341.1
335.6
307.6
226.1
829.0
300.4
458.0
403.8
408.2
336.8
870.0
334.9
484.2
428.4
426.8
353.5
RLA
LRA
RLA
LRA
67.9
67.9
33.3
34.6
34.6
34.6
28.8
67.9
33.3
34.6
34.6
34.6
28.8
89.7
44.9
45.5
43.6
43.6
36.5
106.4
53.8
52.6
46.8
46.8
40.4
147.4
79.5
78.8
65.4
65.4
57.1
345
207
115
191
173
173
120
345
115
191
173
173
120
446
148
247
223
223
164
506
168
280
280
253
176
690
229
382
345
345
276
67.9
67.9
33.3
34.6
34.6
34.6
28.8
89.7
44.9
45.5
43.6
43.6
36.5
106.4
53.8
52.6
46.8
46.8
40.4
147.4
79.5
78.8
65.4
65.4
57.1
147.4
79.5
78.8
65.4
65.4
57.1
345
207
115
191
173
173
120
446
148
247
223
223
164
506
168
280
280
253
176
690
229
382
345
345
276
690
229
382
345
345
276
Table 10B — Electrical Data — 50/60 Hz (38AH044-084 Optional Single-Circuit Units)
38AH
044
054
064
074
084
Voltage
Designation
500
800 (PW)
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
Compressor
A1/B1
Model No.
06E4250/250
06E4250/265
06E8275/265
06E8299/275
06E8299/299
STANDARD UNIT
Supply Voltage†
Nameplate
V-Ph-Hz
Min
Max
208/230-3-60
230-3-50
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
187
198
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
187
325
342
342
414
518
254
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
254
367
418
440
508
632
LEGEND
— Full Load Amps
— Maximum Instantaneous Current Flow During Starting.
(The point in the starting sequence where the sum of the
LRA for the starting compressors, plus the total RLA for
all running compressors, plus the FLA for all running fan
motors is maximum.)
kcmil — Thousand Circular Mils
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (used for sizing; complies with
National Electrical Code [NEC] [U.S.A. Standard], section 430-24).
MOCP — Maximum Overcurrent Protection (used for sizing disconnect; complies with NEC Article 440, Section 22).
RLA — Rated Load Amps
PW
— Part Wind Only
COMPRESSOR*
A1
B1
MCA
MOCP
ICF
177.0
179.0
92.6
93.5
90.7
90.1
78.4
204.3
107.0
107.1
101.9
101.3
88.0
246.4
129.8
126.9
114.9
114.3
100.6
327.2
179.6
174.5
148.2
147.4
132.2
368.2
205.3
200.7
166.8
166.0
148.9
225
225
125
125
125
110
100
250
150
150
125
125
110
350
175
175
150
150
125
450
250
250
200
200
175
500
250
250
225
225
200
434.7
296.7
165.9
241.2
219.6
218.6
162.4
535.7
198.9
297.2
269.6
268.6
206.4
617.5
230.5
341.1
335.6
307.6
226.1
829.0
300.4
458.0
403.8
408.2
336.8
870.0
334.9
484.2
428.4
426.8
353.5
RLA
LRA
RLA
LRA
67.9
67.9
33.3
34.6
34.6
34.6
28.8
89.7
44.9
45.5
43.6
43.6
36.5
106.4
53.8
52.6
46.8
46.8
40.4
147.4
79.5
78.8
65.4
65.4
57.1
147.4
79.5
78.8
65.4
65.4
57.1
345
207
115
191
173
173
120
446
148
247
223
223
164
506
168
280
280
253
176
690
229
382
345
345
276
690
229
382
345
345
276
67.9
67.9
33.3
34.6
34.6
34.6
28.8
67.9
33.3
34.6
34.6
34.6
28.8
89.7
44.9
45.5
43.6
43.6
36.5
106.4
53.8
52.6
46.8
46.8
40.4
147.4
79.5
78.8
65.4
65.4
57.1
345
207
115
191
173
173
120
345
115
191
173
173
120
446
148
247
223
223
164
506
168
280
280
253
176
690
229
382
345
345
276
*All compressors are across-the-line start only except 38AH044
230 v, 3-phase, 50 Hz; and all 346 v, 3-phase, 50 Hz.
†Units are suitable for use on electrical systems where voltage supplied to unit terminals is within listed minimum to maximum limits.
FLA
ICF
NOTES:
1. Maximum allowable phase imbalance: voltage - 2%; amps - 10%.
2. Maximum incoming wire size for terminal block is 500 kcmil.
25
Table 11 — Electrical Data — 50/60 Hz (Units 38AH094,104)
UNIT
38AH
094
104
VOLTAGE
DESIGNATION
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
NAMEPLATE
V-Ph-Hz
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
SUPPLY
VOLTAGE*
MCA
MOCP
ICF
Min
187
325
342
342
414
518
187
325
342
342
414
518
396.0
212.9
209.1
182.8
182.0
160.9
396.8
205.6
205.9
196.7
196.7
168.0
500
250
250
225
225
200
450
250
250
225
225
200
897
343
493
444
443
366
722
298
396
363
361
286
Max
253
380
418
440
506
633
253
380
418
440
506
633
LEGEND
— Not Applicable
— Full Load Amps
— Maximum Instantaneous Current Flow During Starting.
(The point in the starting sequence where the sum of the
LRA for the starting compressors, plus the total RLA for
all running compressors, plus the FLA for all running fan
motors is maximum.)
kcmil — Thousand Circular Mils
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (used for sizing; complies with
National Electrical Code [NEC] [U.S.A. Standard], section
430-24).
MOCP — Maximum Overcurrent Protection (used for sizing disconnect; complies with NEC, section 440-22).
RLA — Rated Load Amps
A1
RLA LRA
106.4 506
53.8
168
52.6
280
46.8
280
46.8
253
40.4
176
89.7
446
44.9
148
45.5
247
43.6
223
43.6
223
36.5
164
COMPRESSOR†
A2
B1
RLA LRA RLA LRA
67.9 345 147.7 690
33.3 115
79.5
229
34.6 191
78.8
382
34.6 173
65.4
345
34.6 173
65.4
345
28.8 120
57.1
276
67.9 345
89.7
446
33.3 229
44.9
148
34.6 191
45.5
247
34.6 173
43.6
223
34.6 173
43.6
223
28.8 120
36.5
164
B2
RLA LRA
—
—
—
—
—
—
—
—
—
—
—
—
89.7 446
49.9 148
45.5 247
43.6 223
43.6 223
36.5 164
*Units are suitable for use on electrical systems where voltage supplied to unit terminals is within listed minimum to maximum limits.
†All compressors are across-the-line start only except 346-V, 3-ph,
50-Hz units.
—
FLA
ICF
NOTES:
1. Maximum allowable phase imbalance: voltage - 2%; amps -10%.
2. Maximum incoming wire size for terminal block is 500 kcmil.
3. For units 38AH094 and 104 compressor model numbers, see
table below:
UNIT
38AH
CKT
MODEL
NO. 06E
26
094
104
A1
A2
B1
A1
A2
B1
B2
–275
–250
–299
–265
–250
–265
–265
Table 12 — Electrical Data — 50/60 Hz (Units 38AH124, 134)
UNIT
38AH
MODULE
124A
124B
134A
134B
VOLTAGE
DESIGNATION
500
300 (PW)
200
900
600
100
500
300 (PW)
200
900
600
100
COMPRESSOR
A1/A2
MODEL NO.
06E8275/
265
06E8299/
275
NAMEPLATE
V-Ph-Hz
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
SUPPLY
VOLTAGE*
MCA
MOCP
ICF
Min
187
325
342
342
414
518
187
325
342
342
414
518
246.4
129.8
126.9
114.9
114.3
100.6
327.2
170.8
174.5
149.0
147.4
132.2
350
175
175
150
150
125
450
250
250
200
200
175
617.5
230.5
341.1
335.6
307.6
226.1
829.0
300.4
458.0
403.8
408.2
336.8
LEGEND
— Full Load Amps
— Maximum Instantaneous Current Flow During Starting.
(The point in the starting sequence where the sum of the
LRA for the starting compressors, plus the total RLA for
all running compressors, plus the FLA for all running fan
motors is maximum.)
kcmil — Thousand Circular Mils
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (used for sizing; complies with
National Electrical Code [NEC] [U.S.A. Standard], section
430-24).
MOCP — Maximum Overcurrent Protection (used for sizing disconnect; complies with NEC, section 440-22).
PW
— Part Wind
RLA — Rated Load Amps
Max
254
367
418
440
508
632
254
367
418
440
508
632
COMPRESSOR†
A1
A2
RLA
LRA
RLA
LRA
106.4 506
89.7
446
53.8
168
44.9
148
52.6
280
45.5
247
46.8
280
43.6
223
46.8
253
43.6
223
40.4
176
36.5
164
147.4 690 106.4 506
79.5
229
53.8
168
78.8
382
52.6
280
65.4
345
46.8
280
65.4
345
46.8
253
57.1
276
40.4
176
*Units are suitable for use on electrical systems where voltage supplied to unit terminals is within listed minimum to maximum limits.
†All compressors are across-the-line start only except 346-v, 3-ph,
50 Hz unit.
FLA
ICF
NOTES:
1. Maximum allowable phase imbalance: voltage - 2%; amps - 10%.
2. Maximum incoming wire size for terminal block is 500 kcmil.
Table 13 — Control Circuit Electrical Data — 50/60 Hz
UNIT
DESIGNATION
–500
–800
–300
–200
–900
–600
–100
UNIT POWER
V-Ph-Hz
208/230-3-60
230-3-50
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
V-Ph-Hz
115-1-60
230-1-50
200-1-50
230-1-60
230-1-50
115-1-60
115-1-60
NOTE: Units 38AH124 and 134 have 2 control boxes per unit, one in each module.
27
CONTROL POWER
Min
103
207
180
207
207
103
103
Max
127
253
220
253
253
127
127
AMPS
4.1
2.0
2.4
2.0
2.0
4.1
4.1
Table 14 — Fan Motor Electrical Data
UNIT
38AH
044
054
064
074
084
094
104
Nameplate
V-Ph-Hz
208/230-3-60
230-3-50
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
Qty
Hp
(kW)
CONDENSER FAN
Total
kW
4
1
(0.746)
6.2
4
1
(0.746)
6.2
4
1
(0.746)
6.2
6
1
(0.746)
9.3
6
1
(0.746)
9.3
6
1
(0.746)
9.4
6
1
(0.746)
9.5
(No.*) FLA Each
(No.*) LRA Each
(1,2) 5.5 (3,4) 6.6
(1,2) 5.5 (3,4) 6.8
(1-4) 4.4
(1-4) 3.9
(1-4) 3.4
(1,2) 2.8 (3,4) 3.3
(1-4) 3.4
(1,2) 5.5 (3,4) 6.6
(1-4) 4.4
(1-4) 3.9
(1-4) 3.4
(1,2) 2.8 (3,4) 3.3
(1-4) 3.4
(1,2) 5.5 (3,4) 6.6
(1-4) 4.4
(1-4) 3.9
(1-4) 3.4
(1,2) 2.8 (3,4) 3.3
(1-4) 3.4
(1,2) 5.5 (3-6) 6.6
(1-6) 4.4
(1-6) 3.9
(1-6) 3.4
(1,2) 2.8 (3-6) 3.3
(1-6) 3.4
(1,2) 5.5 (3-6) 6.6
(1-6) 4.4
(1-6) 3.9
(1-6) 3.4
(1,2) 2.8 (3-6) 3.3
(1-6) 3.4
(1,2) 5.5 (3-6) 6.6
(1-6) 4.4
(1-6) 3.9
(1-6) 3.4
(1,2) 2.8 (3-6) 3.3
(1-6) 3.4
(1,2) 5.5 (3-6) 6.6
(1-6) 4.4
(1-6) 3.9
(1-6) 3.4
(1,2) 2.8 (3-6) 3.3
(1-6) 3.4
(1,2) 30.0 (3,4) 31.6
(1,2) 30.0 (3,4) 31.6
(1-4) 20.9
(1-4) 20.9
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 20.9
(1-4) 20.9
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 20.9
(1-4) 20.9
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 20.9
(1-6) 20.9
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 20.9
(1-6) 20.9
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 20.9
(1-6) 20.9
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 20.9
(1-6) 20.9
(1-6) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 30.0
(1,2) 5.5 (3,4) 6.6
(1-4) 4.4
(1-4) 3.9
(1-4) 3.4
(1,2) 2.8 (3,4) 3.3
(1-4) 3.4
(1,2) 5.5 (3-6) 6.6
(1-6) 3.9
(1-6) 3.4
(1-6) 4.4
(1,2) 2.8 (3-6) 3.3
(1-6) 3.4
(1,2) 30.0 (3,4) 31.6
(1-4) 20.9
(1-4) 20.9
(1-4) 30.0
(1,2) 30.0 (3,4) 31.6
(1-4) 30.0
(1,2) 30.0 (3-6) 31.6
(1-6) 20.9
(1-6) 30.0
(1-6) 20.9
(1,2) 30.0 (3-6) 31.6
(1-6) 30.0
UNIT 38AH
MODULE
124A
124B
134A
134B
208/230-3-60
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
208/230-3-60
380-3-60
380/415-3-50
346-3-50
460-3-60
575-3-60
4
1
(0.746)
6.4
6
1
(0.746)
9.2
LEGEND
FLA — Full Load Amps
LRA — Locked Rotor Amps
*Refers to condenser fans by position: See circled numbers on top views of units in Fig. 3-8.
NOTE: All fans are protected by a single circuit breaker.
28
*To control heating device and provide automatic indoorfan operation on heating.
†Jumper removed only when separate 24-v transformer
power source is used to power the 33CSUCE-06 relay
pack.
**Field supplied.
NOTES:
1. Internal 33CSUCE-06 relay contacts are rated for
1 amp/24 vac.
2. Liquid line solenoid valve LLS-A is used for solenoid
drop on circuit A. Liquid line solenoid valve LLS-B is
used for solenoid drop for circuit B.
3. Solenoid drop is a safety feature which prevents
refrigerant migration to the compressor during the
OFF cycle. It is recommended on all systems and
required on systems where piping exceeds 75 ft
(22.9 m) in length.
4. The 33CSUCE-06 relay pack requires 10 va.
5. Factory wiring is in accordance with NEC; field modifications or additions must be in compliance with all
applicable codes.
6. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for
each terminal block is 500 kcmil.
7. Terminal blocks TB3 and TB4 are for external field
control connections. Control connections are to be
Class 1 wiring.
8. Field-supplied components (IFC, LLS-A, and LLS-B)
must have a maximum sealed coil rating of 30 va
each (0.25 amp at 120 vac and 0.13 amp at 230 vac).
Thermostats must have a minimum pilot duty rating
of 300 va (2.5 amps at 120 vac and 1.3 amps at
230 vac).
9. Replacement of factory wires must be with type
105 C wire or its equivalent.
10. Field-supplied liquid line solenoid valves installed at
the evaporator are required on all units.
11. Units have 175 va of power available for fieldinstalled accessories.
12. To minimize voltage drop, the following wire sizes are
recommended:
LENGTH —
Ft (M)
Up to 50
(15.2)
50-75
(15.2-22.9)
More Than
75 (22.9)
INSULATED WIRE — AWG
(35 C Minimum)
AWG
CR
HD
IFC
IFR
kcmil
LLS
NEC
R
RV
TB
LEGEND
American Wire Gage
Control Relay
Heating Device
Indoor-Fan Contactor
Indoor-Fan Relay
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
— Heating Relay (fieldsupplied 24-v sealed coil,
10 va maximum rating)
— Reversing Valve
— Terminal Block
Factory Wiring
Field Wiring
—
—
—
—
—
—
—
—
No. 18
No. 16
No. 14
Fig. 23 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Dual-Circuit Units
29
*To control heating device and provide automatic indoorfan operation on heating.
†Jumper removed only when separate 24-v transformer
power source is used to power the 33CSUCE-06 relay
pack.
**Field supplied.
NOTES:
1. Internal 33CSUCE-06 relay contacts are rated for
1 amp/24 vac.
2. Liquid line solenoid valves LLS-A1 and A2 are used
for solenoid drops.
3. Solenoid drop is a safety feature which prevents
refrigerant migration to the compressor during the
OFF cycle. It is recommended on all systems and
required on systems where piping exceeds 75 ft
(22.9 m) in length.
4. The 33CSUCE-01 relay pack requires 10 va.
5. Factory wiring is in accordance with NEC; field modifications or additions must be in compliance with all
applicable codes.
6. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for
each terminal block is 500 kcmil.
7. Terminal blocks are for external field control connections. Control connections are to be Class 1 wiring.
8. Field-supplied components (IFC, LLS-A1, and
LLS-A2) must have a maximum sealed coil rating of
30 va each (0.25 amp at 120 vac and 0.13 amp at
230 vac). Thermostats must have a minimum pilot
duty rating of 300 va (2.5 amps at 120 vac and
1.3 amps at 230 vac).
9. Replacement of factory wires must be with type 105 C
wire or its equivalent.
10. Field-supplied liquid line solenoid valves installed at
the evaporator are required on all units.
11. Units have 175 va of power available for field-installed
accessories.
12. To minimize voltage drop, the following wire sizes are
recommended:
LENGTH —
Ft (M)
Up to 50
(15.2)
50-75
(15.2-22.9)
More Than
75 (22.9)
INSULATED WIRE — AWG
(35 C Minimum)
AWG
CR
HD
IFC
IFR
kcmil
LLS
NEC
R
RV
TB
LEGEND
American Wire Gage
Control Relay
Heating Device
Indoor-Fan Contactor
Indoor-Fan Relay
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
— Heating Relay (fieldsupplied 24-v sealed coil,
10 va maximum rating)
— Reversing Valve
— Terminal Block
Factory Wiring
Field Wiring
—
—
—
—
—
—
—
—
No. 18
No. 16
No. 14
Fig. 24 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Optional Single-Circuit Units
30
*To control heating device and provide automatic indoorfan operation on heating.
†Jumper removed only when separate 24-v transformer
power source is used to power the 33CSUCE-06 relay
pack.
**Field supplied.
NOTES:
1. Internal 33CSUCE-06 relay contacts are rated for
1 amp/24 vac.
2. Liquid line solenoid valve LLS-A1 is used for solenoid
drop on circuit A. Liquid line solenoid valve LLS-B1 is
used for solenoid drop for circuit B.
3. Solenoid drop is a safety feature which prevents refrigerant migration to the compressor during the OFF
cycle. It is recommended on all systems and required
on systems where piping exceeds 75 ft (22.9 m) in
length.
4. The 33CSUCE-06 relay pack requires 10 va.
5. Factory wiring is in accordance with NEC; field modifications or additions must be in compliance with all
applicable codes.
6. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum
conductors. Maximum incoming wire size for each terminal block is 500 kcmil.
7. Terminal blocks are for external field control connections. Control connections are to be Class 1 wiring.
8. Field-supplied components (IFC, LLS-A1, and LLS-B1)
must have a maximum sealed coil rating of 30 va each
(0.25 amp at 120 vac and 0.13 amp at 230 vac).
Thermostats must have a minimum pilot duty rating as
follows:
38AH
VA (Each
Stage)
094
275
104
325
AMPS
VAC
2.29
1.15
2.70
1.35
120
240
120
240
9. Replacement of factory wires must be with type 105 C
wire or its equivalent.
10. Field-supplied liquid line solenoid valves installed at
the evaporator are required on all units.
11. Units have 175 va of power available for field-installed
accessories.
12. To minimize voltage drop, the following wire sizes are
recommended:
LENGTH —
Ft (M)
Up to 50
(15.2)
50-75
(15.2-22.9)
More Than
75 (22.9)
AWG
CR
HD
IFC
IFR
kcmil
LLS
NEC
R
RV
TB
LEGEND
American Wire Gage
Control Relay
Heating Device
Indoor-Fan Contactor
Indoor-Fan Relay
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
— Heating Relay (fieldsupplied 24-v sealed coil,
10 va maximum rating)
— Reversing Valve
— Terminal Block
Factory Wiring
Field Wiring
—
—
—
—
—
—
—
—
INSULATED WIRE — AWG
(35 C Minimum)
No. 18
No. 16
No. 14
Fig. 25 — Field Wiring, One 2-Stage Thermostat — Units 38AH094 and 104
31
7. Terminal blocks (TB3) are for external field control con*Jumper removed only when separate 24-v transformer
nections. Control connections are to be Class 1 wiring.
power source is used to power the 33CSUCE-06 relay
8. Field-supplied components (IFC, LLS-A1, A2, and LLSpack.
B1, B2) must have a maximum sealed coil rating of
†Field supplied.
30 va each (0.25 amp at 120 vac and 0.13 amp at
NOTES:
230 vac). Thermostats must have a minimum pilot duty
1. Internal 33CSUCE-06 relay contacts are rated for
rating of 300 va (2.5 amps at 120 vac).
1 amp/24 vac.
9. Replacement of factory wires must be with type 105 C
2. Disconnect black wire from CR2 terminal 6; cap loose
wire or its equivalent.
end and secure. Connect new field-supplied wire from
10. Field-supplied liquid line solenoid valves installed at the
CR2 terminal 6 to TB3 terminal 1 on module 124B or
evaporator are required on all units.
134B.
11. Units have 175 va of power available for field-installed
3. Liquid line solenoid valves LLS-A1 and A2 are used for
accessories.
solenoid drop on module 124A or 134A on circuit A.
12. To minimize voltage drop, the following wire sizes are
Liquid line solenoid valves LLS-B1 and B2 are used for
recommended:
solenoid drop for module 124B or 134B. Solenoid drop
is a safety feature which prevents refrigerant migration
to the compressor during the OFF cycle. It is recomLENGTH —
INSULATED WIRE — AWG
mended on all systems and required on systems where
Ft (M)
(35 C Minimum)
piping exceeds 75 ft (22.9 m) in length.
Up to 50
No. 18
4. The 33CSUCE-06 relay pack requires 10 va.
(15.2)
5. Factory wiring is in accordance with NEC; field modifi50-75
cations or additions must be in compliance with all
No. 16
(15.2-22.9)
applicable codes.
6. Wiring for field power supply must be rated 75 C miniMore Than
No. 14
mum. Use copper, copper-clad aluminum, or aluminum
75 (22.9)
conductors. Maximum incoming wire size for each terFig. 24 — Field Wiring, One 2-Stage Thermostat — Units 38AH124
minal block is 500 kcmil.
AWG
CR
IFC
IFR
kcmil
LLS
NEC
R
RV
TB
LEGEND
American Wire Gage
Control Relay
Indoor-Fan Contactor
Indoor-Fan Relay
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
— Heating Relay (fieldsupplied 24-v sealed coil,
10 va maximum rating)
— Reversing Valve
— Terminal Block
Factory Wiring
Field Wiring
—
—
—
—
—
—
—
and 134
Fig. 26 — Field Wiring, One 2-Stage Thermostat — Units 38AH124 and 134
32
33
— Solenoid Drop Relay
— Terminal Block
— Terminal Block for Variable
Air Volume Units
— Timer Motor
— Timer Relay
— Transformer
— Unloader Solenoid
Factory Wiring
Field Wiring
Fig. 27 — Field Wiring, Single ModuPanel™ Control, 38AH044-084 Dual-Circuit Units
LEGEND
SDR
AHMS — Air Handler Motor
TB
Starter
TBX
AUX
— Auxiliary
C
— Compressor Contactor
TM
FU
— Fuse
TR
GND — Equipment Ground
TRAN
IFC
— Indoor Fan Control
kcmil — Thousand Circular Mils U
LLS
— Liquid Line Solenoid
NEC — National Electrical Code
(U.S.A. Standard)
NOTES:
1. Factory wiring is in accordance with NEC; field modifications or
additions must be in compliance with all applicable codes.
2. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum in
coming wire size for each terminal block is 500 kcmil.
3. Terminal blocks TB3 and TB4 are for external field control connections. Control connections are to be Class 1 wiring.
4. Field-supplied components (IFC, LLS-A, and LLS-B) must have a
maximum sealed coil rating of 30 va each (0.25 amp at 120 vac,
0.13 amp at 230 vac). AHMS IFC-AUX must have minimum pilot
duty rating of 200 va (1.7 amps at 120 vac, 0.9 amps at 230 vac)
each.
5. Replacement of factory wires must be with type 105 C wire or its
equivalent.
6. Field-supplied liquid line solenoid valves installed at the evaporator
are required on all units.
7. Units have 175 va of power available for field-installed accessories.
*Field supplied.
34
—
—
—
—
—
—
—
—
—
Air Handler Motor Starter
Auxiliary
Compressor Contactor
Fuse
Equipment Ground
Indoor Fan Control
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
TM
TR
TRAN
U
SDR
TB
TBX
— Solenoid Drop Relay
— Terminal Block
— Terminal Block for Variable Air
Volume Units
— Timer Motor
— Timer Relay
— Transformer
— Unloader Solenoid
Factory Wiring
Field Wiring
Fig. 28 — Field Wiring, Single ModuPanel™ Control, 38AH044-084 Optional Single-Circuit Units
AHMS
AUX
C
FU
GND
IFC
kcmil
LLS
NEC
LEGEND
NOTES:
1. Factory wiring is in accordance with NEC; field modifications or
additions must be in compliance with all applicable codes.
2. Wiring for field power supply must be rated 75 C minimum. Use
copper, copper-clad aluminum, or aluminum conductors. Maximum
in coming wire size for each terminal block is 500 kcmil.
3. Terminal blocks TB3, TBX1, and TBX2 are for external field control
connections. Control connections are to be Class 1 wiring.
4. Field-supplied components (IFC, LLS-A1, and LLS-A2) must have a
maximum sealed coil rating of 30 va each (0.25 amp at 120 vac,
0.13 amp at 230 vac). AHMS IFC-AUX must have minimum pilot
duty rating of 400 va each (3.4 amps at 120 vac, 1.8 amps at
230 vac) each.
5. Replacement of factory wires must be with type 105 C wire or its
equivalent.
6. Field-supplied liquid line solenoid valves installed at the evaporator
are required on all units.
7. Control has 175 va of power available for field-installed accessories.
*Field supplied.
*Field supplied.
NOTES:
1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable
codes.
2. Wiring for field power supply must be rated 75 C minimum.
Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is
500 kcmil.
3. Terminal blocks TB3, TB4, TBX1, and TBX2 are for external
field control connections. Control connections are to be
Class 1 wiring.
4. Field-supplied components (IFC, LLS-A1, A2, B1, and B2)
must have a maximum sealed coil rating of 30 va each
(0.25 amp at 120 vac, 0.13 amp at 230 vac). AHMS
IFC-AUX contact must have minimum pilot duty rating of
325 va each (2.7 amps at 120 vac, 1.4 amps at 230 vac).
5. Replacement of factory wires must be with type 105 C wire
or its equivalent.
6. Field-supplied liquid line solenoid valves installed at the
evaporator are required on all units.
7. Control has 25 va of power available for field-installed
accessories.
LEGEND
AHMS
AUX
C
FU
GND
IFC
kcmil
LLS
NEC
—
—
—
—
—
—
—
—
—
Air Handler Motor Starter
Auxiliary
Compressor Contactor
Fuse
Equipment Ground
Indoor Fan Control
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
SDR
TB
TBX
TM
TR
TRAN
U
— Solenoid Drop Relay
— Terminal Block
— Terminal Block for Variable Air
Volume Units
— Timer Motor
— Timer Relay
— Transformer
— Unloader Solenoid
Factory Wiring
Field Wiring
Fig. 29 — Field Wiring, Single ModuPanel™ Control, Unit 38AH094
35
*Field supplied.
NOTES:
1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable codes.
2. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum
incoming wire size for each terminal block is 500 kcmil.
3. Terminal blocks TB3, TB4, TBX1, and TBX2 are for external field control connections. Control connections are to be Class 1 wiring.
4. Field-supplied components (IFC, LLS-A1, A2, B1, and B2) must have
a maximum sealed coil rating of 30 va each (0.25 amp at 120 vac,
0.13 amp at 230 vac). AHMS IFC-AUX contact must have minimum
pilot duty rating of 375 va each (3.1 amps at 120 vac,1.6 amps at
230 vac).
5. Replacement of factory wires must be with type 105 C wire or its
equivalent.
6. Field-supplied liquid line solenoid valves installed at the evaporator
are required on all units.
7. Control has 35 va of power available for field-installed accessories.
LEGEND
AHMS
AUX
C
FU
GND
IFC
kcmil
LLS
NEC
—
—
—
—
—
—
—
—
—
Air Handler Motor Starter
Auxiliary
Compressor Contactor
Fuse
Equipment Ground
Indoor Fan Control
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
SDR
TB
TBX
TM
TR
TRAN
U
— Solenoid Drop Relay
— Terminal Block
— Terminal Block for Variable Air
Volume Units
— Timer Motor
— Timer Relay
— Transformer
— Unloader Solenoid
Factory Wiring
Field Wiring
Fig. 30 — Field Wiring, Single ModuPanel™ Control, Unit 38AH104
36
*Field supplied.
NOTES:
1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable
codes.
2. Wiring for field power supply must be rated 75 C minimum.
Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is
500 kcmil.
3. Terminal blocks TB3 and TBX1 are for external field control
connections. Control connections are to be Class 1 wiring.
4. Field-supplied components (IFC, LLS-A1 and A2) must
have a maximum sealed coil rating of 30 va each (0.25 amp
at 120 vac, 0.13 amp at 230 vac). AHMS IFC-AUX contact
must have minimum pilot duty rating of 400 va each
(3.4 amps at 120 vac,1.8 amps at 230 vac).
5. Replacement of factory wires must be with type 105 C wire
or its equivalent.
6. Field-supplied liquid line solenoid valves installed at the
evaporator are required on all units.
7. Units have 175 va of power available for field-installed
accessories.
LEGEND
AHMS
AUX
C
FU
GND
IFC
kcmil
LLS
NEC
—
—
—
—
—
—
—
—
—
Air Handler Motor Starter
Auxiliary
Compressor Contactor
Fuse
Equipment Ground
Indoor Fan Control
Thousand Circular Mils
Liquid Line Solenoid
National Electrical Code
(U.S.A. Standard)
SDR
TB
TBX
TM
TR
TRAN
U
— Solenoid Drop Relay
— Terminal Block
— Terminal Block for Variable Air
Volume Units
— Timer Motor
— Timer Relay
— Transformer
— Unloader Solenoid
Factory Wiring
Field Wiring
Fig. 31 — Field Wiring, Single ModuPanel™ Control, Units 38AH124 and 134
37
Table 15 — Main Power Connection and Control Circuit Wiring
Electrical
Characteristics
(V-Ph-Hz)
208/230-3-60
230-3-50
346-3-50
380-3-60
380/415-3-50
460-3-60
575-3-60
MAIN POWER CONNECTION
Qty
Qty
Terminal
Parallel
Blocks
Conductors*
1
6
1
6
1
3
CONTROL CIRCUIT
Max Wire
Size
(kcmil)
500
500
500
Control Power
(V)
Safety Circuit
(V)
115†
230
200
24
24
24
1
3
500
230
24
1
3
500
115†
24
LEGEND
kcmil — Thousand Circular Mils
*Conductors are from the safety disconnect.
†Control power is accomplished with a step-down transformer where
primary voltage is field voltage.
3. Open liquid line service valves.
4. Check tightness of all electrical connections.
5. Oil should be visible in the compressor sight glasses.
See Fig. 32. An acceptable oil level in the compressor
is from 1/8 to 1/3 up on the sight glass. Adjust the oil
level as required. No oil should be removed unless the
crankcase heater has been energized for at least 24
hours. See Preliminary Oil Charge section on page 40,
for Carrier-approved oils.
6. Electrical power source must agree with unit
nameplate.
Step 5 — Install Accessories
LOW-AMBIENT OPERATION
Units 38AH044-084, 124, and 134 — If operating temperatures below 55 F (13 C) are expected, Motormaster® V fan
motor control is recommended. Refer to separate installation
instructions for low-ambient operation guidelines.
Units 38AH094 and 104 — If operating temperatures below
45 F (7 C) are expected, Motormaster V fan motor control is
recommended. Refer to separate installation instructions for
low-ambient operation guidelines.
MISCELLANEOUS ACCESSORIES — For applications
requiring special accessories, the following packages are
available: condenser coil hail guard package, gage panel,
unloader package, unloader conversion kits, sound reduction
package, condenser coil protective grilles, compressor security
grilles, ModuPanel™ control, and thermostat transformer relay
package.
CAUTION
Crankcase heaters on all units are wired into the control circuit, so they are always operable as long as the main power
supply disconnect is on (closed), even if any safety device
is open. Compressor heaters must be on for 24 hours prior
to the start-up of any compressor. Failure to comply could
result in equipment damage.
PRE-START-UP
IMPORTANT: Before beginning Pre-Start-Up or StartUp, review Start-Up Checklist at the back of this publication. The checklist assures proper start-up of a unit and
provides a record of unit condition, application requirements, system information, and operation at initial startup.
7. Crankcase heaters must be firmly locked into compressors, and must be on for 24 hours prior to start-up.
8. Fan motors are 3-phase. Check rotation of fans during
first start-up check. Fan rotation is clockwise as
viewed from top of unit. If fan is not turning clockwise, reverse 2 of the power wires.
9. Check compressor suspension. On units 38AH044084, 124, and 134, snubber washers (for noise suppression) can be moved with finger pressure. On units
38AH094 and 104, rails allow compressors to float
freely on compressor rail springs.
10. On 38AH074,084 single-circuit units and module
38AH134B, ensure that the packaging block located
between the oil equalization tube and the compressor
cross-brace has been removed.
Do not attempt to start the air-conditioning system until the
following checks have been completed.
System Check
1. Check all system components, including the airhandling equipment. Consult manufacturers instructions. If the unit has field-installed accessories, be sure
all are properly installed and wired correctly. Refer to
unit wiring diagrams.
2. Backseat (open) compressor suction and discharge
shutoff valves. Close valves one turn to allow refrigerant pressure to reach the test gages.
38
CYLINDER
HEADS
PRESSURE RELIEF
VALVE
SIGHT
GLASS
OIL PRESSURE SWITCH AND
CAPACITY CONTROL
PRESSURE SWITCH CAPILLARIES
RAIL
CRANKCASE
HEATER
MUFFLER
OIL
EQUALIZER
LINE
HIGHPRESSURE
SWITCH
FAN CYCLING
PRESSURE SWITCH
LOWPRESSURE
SWITCH
SIGHT
GLASS
MOUNTING
SPRING
(HIDDEN)
NOTE: Units 38AH044-084 and 38AH124, 134 compressors are pan mounted. Units 38AH094 and 104 compressors are mounted on rails.
Fig. 32 — 06E Compressors, Typical
Approximately 21/2 minutes after TC1 closes, timer contacts
D-D1 open and D-D2 close. If pressure is insufficient to close
the low-pressure switch, the low-pressure switch relay is open,
the compressor shuts down, and the Time Guard control is initiated. (Time Guard control prevents compressor from restarting for 5 minutes after the demand for cooling is satisfied.)
START-UP
Compressor crankcase heaters must be on for 24 hours before start-up. To energize the crankcase heaters, set the space
thermostat above the ambient so there will be no demand for
cooling. Close the field disconnect and turn on the fan circuit
breakers. Leave the compressor circuit breakers off/open. The
crankcase heaters are now energized.
Unit Control Box — (See Fig. 33.) Viewed facing compressors, the control box is at the left end of the unit. All incoming power enters through the control box. The control box
contains power components and electronic controls. Outer panels are hinged and latched for easy opening. Remove screws to
remove inner panels. Outer panels can be held open for service
and inspection by using door retainer on each panel. Remove
bottom pin from door retainer assembly, swing retainer out
horizontally, and engage pin in one of the retainer ears and the
hinge assembly.
Sequence of Operation — Units are controlled with
electromechanical components. Each refrigeration circuit (except 38AH044-084 optional single-circuit units) is operated by
an independent timer which controls the operation sequence of
each circuit.
On a call for cooling, first stage cooling thermostat TC1
closes. Condenser fans and timer (TM) are energized. After
approximately 7 seconds, timer contacts E-E1 close. Approximately 12 seconds after TC1 closes, normally open timer contacts B-B1 close for 1 second. This energizes compressor A1
contacts CA1 and starts the compressor. At the same time, solenoid drop relays (SDRs) and liquid line solenoid valve no. 1
(LLS-A for 38AH044-084 dual-circuit units; LLS-A1 for all
other units) opens, and timer relay no. 1 (TR2) is energized.
Normally open TR2 contacts close, completing a circuit around
B-B1 and through compressor A1 contactors to maintain compressor operation when B-B1 contacts open. Contacts E-E1
remain closed for approximately 40 seconds to bypass the oil
pressure switch (OPS). If oil pressure is insufficient when contacts E-E1 open, the compressor stops, the timer cycles off, and
the control circuit locks out. At start-up, timer contacts D-D1
are closed, bypassing low-pressure relay contacts LPR-A for
21/2 minutes. This provides a winter start-up feature.
Condenser Fans — Each fan is supported by a formed
wire mount bolted to the fan deck and covered with a wire
guard. The exposed end of the fan motor shaft is protected
from weather by grease. If fan motor must be removed for service or replacement, be sure to regrease fan shaft and reinstall
fan guard. For proper performance, fan should be 7/8 in.
(22 mm) below top of venturi on the fan deck to top of the fan
hub for 60-Hz units, and 1/2 in. (13 mm) for 50-Hz units. (See
Fig. 34.) Tighten setscrews to 15 ± 1 ft-lbs (20  1.3 N-m).
Figure 34 shows proper position of mounted fan.
IMPORTANT: Check for proper fan rotation (clockwise
viewed from above). If necessary, switch leads to
reverse.
39
TRANSFORMERS
FAN CONTACTORS
TIMERS
TIME-DELAY
RELAY
COMPRESSOR
CIRCUIT
BREAKERS
FAN CIRCUIT
BREAKER
TERMINAL
BLOCKS
OIL PRESSURE
SWITCHES
FUSE
HOLDERS
TERMINAL
BLOCKS
COMPRESSOR
CONTACTORS
Fig. 33 — Unit Control Box
Preliminary Checks
1. Ensure that compressor service valves are backseated.
2. Verify that each compressor on units 38AH044-084,
124, and 134 floats freely on its mounting springs. Verify that each compressor on units 38AH094 and 104
floats freely on its rails.
3. Check that electric power supply agrees with unit
nameplate data.
4. Verify that compressor crankcase heaters are securely
in place.
5. Check that compressor crankcase heaters have been on
at least 24 hours.
6. Note that compressor oil level is visible in the sight
glass.
7. Recheck for leaks using same procedure as previously
outlined in Step 3 — Make Refrigerant Piping Connections, page 15.
8. If any leaks are detected, evacuate and dehydrate as
previously outlined in Step 3 — Make Refrigerant Piping Connections, page 15.
Preliminary Oil Charge — Each compressor is factory charged with oil (see Tables 3A-4B). When oil is checked at
start-up, it may be necessary to add or remove oil to bring it
to the proper level. One recommended oil level adjustment
method is as follows:
ADD OIL — Close suction shutoff valve and pump down
crankcase to 2 psig (14 kPa). (Low-pressure cutout must be
jumpered.) Wait a few minutes and repeat until pressure remains steady at 2 psig (14 kPa). Remove oil fill plug above the
oil level sight glass, add oil through plug hole, and replace
plug. Run compressor for 20 minutes and check oil level.
NOTE: Fan rotation is clockwise when viewed from top of unit.
Fig. 34 — Condenser Fan Adjustment
Required Compressor Modification for
38AH044-084 Optional Single-Circuit Units,
When Compressor A1 is Out — To maintain unit
operation, compressor no.1 must be operable. If it is not operable, the following temporary modifications must be made to
keep the unit running:
1. Change the oil pressure switch connections from compressor A1 to compressor A2.
2. Connect compressor A2 into the Time Guard circuit as
compressor A1 was originally.
3. Open compressor A1 circuit breaker.
NOTE: Make sure the crankcase heaters are energized when
compressors are off.
IMPORTANT: For units with 2 compressors per refrigeration circuit, both compressors must be running to
adjust the oil level. Two oil level equalizer lines between
compressors distribute the oil to each compressor.
40
38AH094,104 UNITS — Start-up of lead circuit A, compressor A1 (Table 16) is delayed from 12 seconds to 51/2 minutes
from the time the call for cooling is initiated. After lead circuit
A, compressor A1 starts, close refrigeration circuit thermostat
TC2 to start lag circuit B, lead compressor B1. Start-up of compressor B1 is delayed from 12 seconds to 51/2 minutes. (Circuit
B of unit 38AH094 has only one compressor.)
Each circuit’s lead compressor start-up is controlled by the
unit control timer. The circuit’s lag compressor start-up is controlled by the D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compressor suction
pressure. The circuit’s lag compressor will start approximately
21/2 minutes after a call for cooling if compressor pressure is
above CCPS set point.
38AH124,134 UNITS — Start-up of the lead circuit (module
124A or 134A) lead compressor A1 (Table 16) is delayed from
12 seconds to 51/2 minutes from the time the call for cooling is
initiated by TC1. Lag compressor A2 is controlled by D-D2
timer contacts and capacity control pressure switches (CCPSs)
which monitor compressor suction pressure. The lag compressor starts approximately 21/2 minutes after the lead compressor
starts if the suction pressure is above the CCPS set point.
After the lead circuit (module 124A or 134A) lead compressor A1 (Table 16) starts, close the TC2 thermostat to start the
lag circuit (module 124B or 134B) lead compressor (A1). Lag
circuit compressor A1 start-up is delayed from 12 seconds to
51/2 minutes from the time the call for cooling is initiated by
TC2. Lag compressor A2 is controlled by D-D2 timer contacts
and CCPSs which monitor compressor suction pressure. Lag
compressor A2 starts approximately 21/2 minutes after lead
compressor A1 starts if the suction pressure is above the CCPS
set point.
NOTE: Use only Carrier approved compressor oil. Approved
sources are:
Totaline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Witco Suniso . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3GS
Shrieve Chemical . . . . . . . . . . . . . . . . . . . . . . . . . . . Zerol 150*
Texaco Ind. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WFI-32-150
IGI Petroleum Ind. . . . . . . . . . . . . . . . . . . . . . . . . . . .Cryol-150
*Alkyl Benzene Oil.
Do not reuse oil that has been drained out, or oil that has
been exposed to atmosphere.
REMOVE OIL — Pump down compressor to 2 psig
(14 kPa). Loosen the 1/4-in. (6.4-mm) pipe plug at the compressor base and allow the oil to seep out past the threads of the
plug.
NOTE: The crankcase will be slightly pressurized. Do not
remove the plug, or the entire oil charge will be lost.
Small amounts of oil can be removed through the oil pump
discharge connection while the compressor is running.
Preliminary Charge — Refer to GTAC II (General
Training Air Conditioning), Module 5, Charging, Recovery,
Recycling, and Reclamation for charging procedures. Using
the liquid charging method and charging by weight procedure,
charge each circuit with the amount of R-22 listed in Table 3A,
3B, 4A, or 4B.
CAUTION
Never charge liquid into the low-pressure side of system.
Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating. Failure to comply could result in equipment damage.
Adjust Refrigerant Charge
Start Unit — The field disconnect is closed, the fan circuit
breaker is closed, and the space thermostats are set above ambient so that there is no demand for cooling. Only the crankcase
heaters are energized.
Close the compressor circuit breakers and then reset both
space thermostats below ambient so that a call for stage one
cooling is ensured. Lead refrigeration circuit thermostat TC1
must be set to call for cooling at a lower temperature than lag
refrigeration circuit thermostat TC2. See Table 16 for lead/lag
circuits on all units. Now set TC2 for cooling.
NOTE: Do not use circuit breakers to start and stop the compressor except in an emergency.
38AH044-084 DUAL-CIRCUIT UNITS — Start-up of lead
compressor A1 (Table 16) will be delayed from 12 seconds to
51/2 minutes from the time the call for cooling is initiated by
TC1. After the lead compressor starts, close the TC2 thermostat to start lag circuit compressor B1. Compressor B1 will start
a minimum of 60 seconds after thermostat TC2 is closed.
38AH044-084 OPTIONAL SINGLE CIRCUIT UNITS —
Start-up of lead compressor A1 (Table 16) is delayed from
12 seconds to 51/2 minutes from the time the call for cooling is
initiated by TC1. Closure of TC2 will actuate LLS-A2. Lag
compressor A2 is controlled by D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compressor suction pressure. The lag compressor starts approximately 2 minutes after the lead compressor starts if the suction
pressure is above the CCPS set point.
CAUTION
Never charge liquid into the low-pressure side of system.
Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating. Failure to comply could result in equipment damage.
With all fans operating, and all compressors on the circuit
being serviced operating at full capacity, adjust the refrigerant
charge in accordance with the unit charging charts located on
the inside of the control box doors and in Fig. 35-48. Charge
vapor into compressor low-side service port located above oil
pump crankshaft housing. Measure pressure at the liquid line
service valve, making sure a Schrader depressor is used if required. Also, measure liquid line temperature as close to the
liquid service valve as possible. Add charge until the pressure
and temperature conditions of the charging chart curve are met.
If liquid pressure and temperature point fall above curve, add
charge. If liquid pressure and temperature point fall below
curve, reduce the charge until the conditions match the curve.
If the sight glass at location A (Fig. 13 and 14) is cloudy,
check refrigerant charge again. Ensure all fans and compressors on the circuit being serviced are operating. Also ensure
maximum allowable liquid lift has not been exceeded.
If the sight glass at location A is clear and the sight glass at
location B is cloudy, a restriction exists in the line between the
2 sight glasses. Check for a plugged filter drier or partially
open solenoid valve. Replace or repair, as needed.
41
Table 16 — Index of Lead/Lag Circuits and Compressors
UNIT
38AH
LEAD CIRCUIT
Compressor, Lead
Compressor; Lag
LAG CIRCUIT
Compressor, Lead
Compressor; Lag
044-084
STD
044-084
OPT
094
104
124
134
A
A
A
A
A1
*
A1
A2
A1
A2
A1
A2
B
†
Module
124A
A1
A2
Module
124B
A1
A2
Module
134A
A1
A2
Module
134B
A1
A2
B1
*
B
B
B1
*
B1
B2
LEGEND
OPT — Optional Single-Circuit Units
STD — Standard Dual-Circuit Units
*Circuit has only one compressor.
†Units have only one circuit.
stops. The unloader is now at 0 psig (0 kPa) set point. If
electrically actuated unloaders are installed, energize the solenoid to unload the compressor. Recheck the compressor oil level as described earlier in Check Compressor Oil Level.
Return unloader to original setting after checks are
complete.
UNITS 38AH094,104 — For this minimum load check, the
lead compressor (A1, B1) of each refrigeration circuit is unloaded. See Table 16. The lag compressor (A2, B2 38AH104
only) of each refrigeration circuit must not be operating.
Unload the compressor(s) by turning the control set point
adjustment nut counterclockwise until the adjustment nut
stops. The unloader is now at 0 psig (0 kPa) set point. If electrically actuated unloaders are installed, energize the solenoid to
unload the compressor.
Return unloader to original setting after checks are
complete.
Check Compressor Oil Level — After adjusting the
refrigerant charge, allow each circuit to run fully loaded for
20 minutes. Running oil level should be 1/8 to 1/3 up on the sight
glass. Stop the compressors at the field power supply disconnect and check the crankcase oil level. Add oil only if necessary to bring the oil into view in the sight glass. If oil is added,
run the circuit for an additional 10 minutes, then stop and check
oil level. If the level remains low, check the piping system for
proper design for oil return; also, check the system for leaks.
If the initial check shows too much oil (too high in the sight
glass) remove oil to proper level. See Preliminary Oil Charge
section on page 40 for proper procedure for adding and removing oil.
When the above checks are complete, repeat the procedure
with the unit operating at minimum load conditions.
UNITS 38AH044-084,124, AND 134 — For this minimum
load check, run the lead compressor of each refrigeration circuit fully unloaded with the lag compressor not operating.
Unload the compressor(s) by turning the control set point
adjustment nut counterclockwise until the adjustment nut
Final Checks — Ensure all safety controls are operating,
control panel covers are on, and the service panels are in place.
Fig. 35 — Charging Chart — Unit 38AH044; 50/60 Hz — Dual Circuit
42
Fig. 36 — Charging Chart — Unit 38AH054; 50/60 Hz — Dual Circuit
Fig. 37 — Charging Chart — Unit 38AH064; 50/60 Hz — Dual Circuit
43
Fig. 38 — Charging Chart — Unit 38AH074; 50/60 Hz — Dual Circuit
Fig. 39 — Charging Chart — Unit 38AH084; 50/60 Hz — Dual Circuit
44
Fig. 40 — Charging Chart — Unit 38AH044;
50/60 Hz — Optional Single Circuit
Fig. 42 — Charging Chart — Unit 38AH064;
50/60 Hz — Optional Single Circuit
Fig. 41 — Charging Chart — Unit 38AH054;
50/60 Hz — Optional Single Circuit
Fig. 43 — Charging Chart — Unit 38AH074;
50/60 Hz — Optional Single Circuit
45
Fig. 44 — Charging Chart — Unit 38AH084;
50/60 Hz — Optional Single Circuit
Fig. 45 — Charging Chart — Unit 38AH094; 50/60 Hz
Fig. 46 — Charging Chart — Unit 38AH104; 50/60 Hz
46
Fig. 47 — Charging Chart — Modules 124A,124B,
and 134A; 50/60 Hz
Fig. 48 — Charging Chart — Modules 134B;
50/60 Hz
SERVICE
Troubleshooting — Refer to Troubleshooting section
on page 53.
WARNING
Oil Pressure Safety Switch (OPS) — An oil pressure safety switch for each of the independent refrigerant circuits shuts off the compressor in that circuit if oil pressure is
not established at start-up or maintained during operation. If
the OPS stops the unit, determine and correct the cause before
restarting the unit. Failure to do so constitutes equipment abuse
and could affect the warranty.
Turn off all power to unit before servicing. The ON-OFF
switch on control panel does not shut off control power;
use field disconnect. Electric shock can cause personal
injury.
Coil Cleaning — Clean the coils with a vacuum cleaner,
Compressor Motor Protection
compressed air, water, or a non-wire bristle brush.
CIRCUIT BREAKER — A manual reset, calibrated trip circuit breaker for each compressor protects against overcurrent.
Do not bypass connections or increase size of circuit breaker
for any reason. If trouble occurs, determine the cause and correct it before resetting the breaker.
CRANKCASE HEATER (See Fig. 32) — Each compressor
has an electric crankcase heater located in the bottom cover.
The heater is held in place by a clip and bracket and must be
tightly connected since exposure to the air causes the heater to
burn out. Each heater is wired into the compressor control circuit through a relay which energizes only when the compressor
is off. The heater keeps the oil at a temperature that prevents
excessive absorption of refrigerant during shutdown periods.
Energize the crankcase heaters when the unit is not running
except during prolonged shutdown or servicing. Energize the
heaters at least 24 hours before restarting the unit after prolonged shutdown.
TIME GUARD FUNCTION — This function prevents compressors from short-cycling.
Refrigerant Circuit
LEAK TESTING — Units are shipped with a nitrogen holding charge. If there is no pressure in the system, introduce
enough nitrogen to search for the leak. Repair the leak using
good refrigeration practices. After leaks are repaired, system
must be evacuated and dehydrated using methods described in
GTAC II, Module 4, System Dehydration.
REFRIGERANT CHARGE (Refer to Table 3A, 3B, 4A, or
4B) — At the liquid line connection point on each circuit is
a factory-installed liquid line service valve. On each valve is
a 1/4-in. Schrader connection for charging liquid refrigerant.
Charging with Unit Off and Evacuated — Close liquid line
service valve before charging. Weigh in charge shown in Table
3A, 3B, 4A, or 4B. Open liquid line service valve; start unit
and allow it to run several minutes fully loaded. Check for a
clear sight glass. Be sure clear condition is liquid and not vapor.
Complete charging the unit in accordance with Adjust Refrigerant Charge section on page 41.
Charging with Unit Running — If charge is to be added while
unit is operating, it is necessary to have all condenser fans and
compressors operating. It may be necessary to block condenser
coils at low-ambient temperatures to raise condensing pressure
to approximately 280 psig (1931 kPa) to turn all condenser fans
on. Do not totally block a coil to do this. Partially block all
coils in uniform pattern. Charge vapor into compressor lowside service port located above oil pump crankshaft housing.
Charge each circuit until sight glass shows clear liquid.
Fan Motor Protection — Fan motors are protected by a
single circuit breaker for all motors.
Head Pressure Control — Head pressure control reduces condenser capacity under low-ambient conditions. This
is achieved by fan cycling control (standard, all units) and
Motormaster® V control accessory (field installed).
47
FAN CYCLING — All condensing units have standard provision for fully automatic intermediate season head pressure control through fan cycling (see Table 17).
38AH044-084 Dual-Circuit Units — Fans no. 3 and 4 are cycled by pressure control on all units. On 38AH074 and 084,
fans no. 5 and 6 are also cycled by pressure control.
38AH044-084 Optional Single-Circuit Units — Fans no. 3
and 4 are cycled by pressure control on all units. On 38AH074
and 084, fans no. 5 and 6 are cycled by an air-temperature
switch located in the bottom shelf of the control box.
Units 38AH094,104 — Fans no. 3 through 6 are cycled by
pressure control.
Units 38AH124,134 — Fans no. 3 and 4 on each unit module
are cycled by pressure control. On module 134B only, fans no.
5 and 6 are cycled by an air-temperature switch located in the
bottom shelf of the control box.
Pressure control is achieved via a fan cycling pressure
switch located on the cylinder head of the unit or circuit lead
compressor (see Fig. 32).
The air-temperature switch used to control fans no. 5 and 6
on 38AH074,084 optional single-circuit units and on module
134B is closed and cycles the fans on when the ambient-air
temperature is above 70 F (21 C).
Low-Pressure Switch — The low-pressure switch
(LPS) has fixed nonadjustable settings. It is located at the pump
end of the compressor above the bearing head. See Table 18 for
pressure switch settings.
TO CHECK — Slowly close the suction cut-off valve and allow the compressor to shut down. This should occur at approximately 27 psig (186 kPa). Slowly open the valve. The compressor restarts under Time Guard control when the pressure
builds to approximately 67 psig (462 kPa).
Table 18 — Pressure Switch Settings, Psig (kPa)
SWITCH
High
Low
CUTOUT
426  7
(2935  48)
27  4
(186  28)
CUT-IN
320  20
(2205  138)
67  7
(462  48)
Capacity Control
38AH044-084 DUAL-CIRCUIT UNITS — Capacity control
is achieved by a pressure-actuated cylinder bank unloader on
lead compressor A1. As the cooling load decreases and the
suction pressure drops, the unloader actuates at the pre-set suction pressure and unloads the cylinder bank. (See Fig. 49 and
Table 19A.) The unloading of the compressor cylinder bank
has no effect on the operation of lag compressor B2, which is
controlled by TC2.
38AH044-084 SINGLE-CIRCUIT UNITS AND MODULES 124A, 124B, 134A, AND 134B — Capacity control
is achieved by a pressure-actuated cylinder bank unloader on
lead compressor A1. See Table 16. As the cooling load decreases and the suction pressure drops, the unloader actuates at
the pre-set suction pressure and unloads the cylinder bank. (See
Fig. 49 and Table 19B and 20.) Lag compressor A2 is controlled by fixed setting capacity control pressure switches
(CCPSs) as follows:
Table 17 — Head Pressure Control through Fan
Cycling
FAN CYCLING CONTROL, psig (kPa)
Control by Pressure*
10 (69)
Switch Opens
160 (1103)
Switch Closes
255 (1758)
*On all units, fans no. 3 and 4; also on unit 38AH074, 084 (dualcircuit units only) and 38AH094,104, fans no. 5 and 6.
NOTE: Fans no. 1 and 2 are noncycling. Units 38AH074,084
optional single-circuit units and module 134B fans no. 5 and 6 are
cycled by an air-temperature switch which operates above 70 F
(21 C) ambient-air temperature.
SWITCH
CCPS 1
CCPS 2
CUT-IN —
psig (kPa)
83 (572)
80 (551)
CUTOUT —
psig (kPa)
63 (531)
53 (365)
CCPS — Capacity Control Pressure Switch
38AH044-064,
Modules 124A, 124B,
134A
If suction pressure continues to drop after lead compressor
A1 unloads and lag compressor A2 is operating, A2 will stop
operating when the suction pressure drops to the CCPS cutout
point.
38AH094,104 — Capacity control is achieved by a pressureactuated cylinder bank unloader on the lead compressor (A1,
B1) on each of the 2 refrigeration circuits. As the cooling load
decreases and the suction pressure drops, the unloader actuates
at the pre-set suction pressure and unloads the cylinder bank.
(See Fig. 49 and Table 20.) The unloading of the compressor
cylinder bank has no effect on the operation of the circuit lag
compressor (A2, B2 [except 38AH094, circuit B]) which is
controlled by fixed setting capacity control pressure switches
(CCPSs) as follows:
38AH074-104,
Module 134B
Winter Start Control — A 21/2-minute low-pressure
switch (LPS) bypass function in the timer prevents nuisance
LPS trips during start-up in low-ambient conditions.
High-Pressure Switch — This switch has nonadjust-
able settings. Figure 32 shows connection on a cylinder head.
See Table 18 for pressure switch settings.
NOTE: High-pressure switch must be removed from cylinder
head before removing compressor from the unit.
TO CHECK — Slowly close the discharge shutoff valve until
the compressor shuts down. This should be at approximately
426 psig (2935 kPa). Slowly open the valve. When the pressure
drops to approximately 320 psig (2205 kPa), the pressure
switch resets. To reenergize the control circuit, manually
switch the fan circuit breaker off and then on. The compressor
starts again under Time Guard controls.
SWITCH
CCPS 1
CCPS 2
CUT-IN —
psig (kPa)
83 (572)
80 (551)
CCPS — Capacity Control Pressure Switch
48
CUTOUT —
psig (kPa)
63 (531)
53 (365)
Table 19B — One 2-Stage Thermostat Capacity
Control for 38AH044-084 Optional Single-Circuit Units
SYSTEM
CAPACITY
(%)
8
100
6
75
044
4
50
2
25
10
100
8
81
6
60
054
6
56
4
37
2*
19*
12
100
10
82
8
64
064
6
56
4
36
2†
18
12
100
10
81
8
62
074
6
57
4
38
2†
19
12
100
10
83
8
66
084
6
50
4
33
2†
17
*Requires accessory unloader on lead 06E-265 compressor (A1).
†Requires VAV (variable air volume) factory-installed option or accessory
unloader.
UNIT38AH
Unloader Settings
Unload, psig (kPa)
Load, psig (kPa)
*Unloader location.
QUANTITY OF
LOADED CYLINDERS
Table 20 — One 2-Stage Thermostat Capacity
Control for 38AH094-134 Units
UNIT
38AH
56 (386)
76 (524)
Fig. 49 — Unloader Location and Setting
094
Table 19A — One 2-Stage Thermostat Capacity
Control for 38AH044-084 Dual-Circuit Units
QUANTITY OF LOADED
SYSTEM
COMPRESSOR CYLINDERS
CAPACITY
Circuit
Circuit
(%)
Total
A
B
4
4
8
100
2
4
6
75
044
4
0
4
50
2
0
2
25
4
6
10
100
2
6
8
79
054
2
4
6*
59
4
0
4
42
2
0
2
21
6
6
12
100
4
6
10
84
2
6
8*
68
064
6
0
6
48
4
0
4
32
2
0
2*
16
6
6
12
100
4
6
10
86
2
6
8*
72
074
6
0
6
43
4
0
4
29
2
0
2*
15
6
6
12
100
4
6
10
83
2
6
8*
66
084
6
0
6
50
4
0
4
33
2
0
2*
17
*Requires units with VAV (variable air volume) factory-supplied option.
NOTE: Units have 2 independent refrigeration circuits. Circuit A is lead circuit.
UNIT
38AH
104
124
134
QUANTITY OF LOADED
COMPRESSOR CYLINDERS
Ckt A
Ckt B
Total
10
6
16
10
4
14
10
2
12
10
0
10
8
0
8
6
0
6
4
0
4
10
12
22
10
10
20
10
8†
18
10
6
16
10
4
14
10
2†
12
10
0
10
8
0
8
6
0
6
4
0
4
2†
0
2
12
12
24
12
10
22
12
8†
20
12
6
18
12
4
16
12
2†
14
12
0
12
10
0
10
8
0
8
6
0
6
4
0
4
2
0
2
12
12
24
10
12
22
10
10
20
8*
10
18
6
10
16
6
8*
14
6
6
12
4
6
10
6
0
6
4
0
4
2*
0
2
SYSTEM
CAPACITY
(%)
100
85
70*
55
44
33
22
100
91
82
74
65
56
47
38
26
17
9†
100
91
82*
77
68
59
50
41
32*
27
18
9†
100
92
83
75*
67
58*
50
42
25
17
8*
*Requires VAV (variable air volume) unit or accessory unloader(s) field
installed on circuit lead compressor. Lead compressor is identified in
Table 16, page 42.
†Requires field-installed accessory unloader on circuit lead compressor. Lead
compressor is identified in Table 16, page 42.
NOTES:
1. Temperatures calculated with the minimum number of fans operating per
circuit.
2. See Table 16, page 42, for information on lead and lag circuits.
49
Pressure Relief — High-side pressure relief is provided
by a fusible plug in the liquid line at the service valve. For lowside pressure relief, a fusible plug is inserted in the side of the
accumulator (all units except 38AH044-084 dual-circuit,
constant-volume units). See Fig. 50. The 38AH044-084 dualcircuit, constant-volume units have a fusible plug in the suction
tubing. A pressure relief valve installed on the compressor relieves at 450 psig (3102 kPa) (see Fig. 3-8).
Timer Functions — (See Timer Cycle, Fig. 52.) Each
refrigeration circuit is controlled by an independent timer
which allows for the independent operation of each refrigeration circuit.
NOTE: The 38AH044-084 optional single-circuit units have
one timer which controls the lead compressor. Lag compressor
is controlled by CCPS (capacity control pressure switch).
CONDENSER
COIL
FUSIBLE
PLUG
SUCTION
LINE
a38-190tf
Fig. 52 — Timer Cycle
SWITCH A — The timer is energized through contacts A-A1
or A-A2. This establishes the Time Guard function which prevents compressor short-cycling. Start of compressor is delayed
approximately 51/2 minutes after shutdown.
SWITCH B — The compressor is initially energized through
contacts B-B1.
SWITCH D — Contacts D-D1 provide a 21/2-minute bypass
of the low-pressure switch at start-up for winter-start control.
On 38AH044-084 optional single-circuit units, contacts D-D2
control start-up of compressor A2.
SWITCH E — Contacts E-E1 provide a 2-minute bypass of
the oil pressure switch at start-up. If oil pressure does not build
to the required minimum pressure in 2 minutes, the compressor
shuts down and the control circuit locks out.
On 38AH044-084 dual-circuit and 38AH094,104 units, lag
circuit B start-up is delayed 60 seconds after a call for cooling
is made to the circuit. This prevents compressor(s) in both lead
and lag circuits from starting at the same time.
BYPASS/SPEEDUP PINS — Bypass and speedup shorting
pins are provided for service troubleshooting purposes. Shorting the bypass pins will eliminate the 330-second short cycle
time delay. Shorting the speedup pins will decrease all timing
functions by a factor of 8. The bypass and speedup pin jumpers
must be removed after servicing.
NOTE: Black denotes closed contacts.
ACCUMULATOR
DISCHARGE
LINE
COMPRESSOR RAIL
Fig. 50 — Accumulator and Fusible Plug
CONTROL SET POINT — Control set point (cylinder load
point) is adjustable from 0 to 85 psig (0 to 586 kPa). To adjust
the set point, turn the control set point adjustment nut clockwise to bottom stop. (See Fig. 51.) In this position, load-up set
point is 85 psig (586 kPa). Turn adjustment counterclockwise
to desired control set point. Every full turn counterclockwise
decreases the load-up set point by 7.5 psig (52 kPa).
Control Circuit Reset — The control circuit locks out
if the unit shuts down because of low oil pressure or excessive
high-side pressure. To reset the control circuit, open and close
the fan circuit breaker (FCB). This resets the timer, and the unit
restarts under Time Guard control. At start-up, if the lowpressure switch (LPS) does not close after 21/2 minutes, the unit
shuts down. When the pressure builds enough for the LPS to
cut in, the control circuit is energized automatically and startup proceeds under Time Guard control.
38AH044-084 DUAL-CIRCUIT UNITS; 38AH094,104 —
If circuit A operation is insufficient for the cooling requirements, the thermostat second stage TC2 closes to bring
circuit B on-line for cooling. This circuit follows the same
sequence of operation as the lead circuit, except a 60-second
time delay relay (TDR) delays compressor start-up for 60 seconds after the call for cooling.
Fig. 51 — Pressure-Actuated
Capacity Control Valve
PRESSURE DIFFERENTIAL — Pressure differential (difference between cylinder load and unload points) is adjustable
from 6 to 22 psig (41 to 152 kPa). To adjust, turn pressure
differential adjustment screw counterclockwise to back stop
position. The differential pressure is now adjusted to 6 psig
(41 kPa). Turn the adjustment screw clockwise to adjust the
differential pressure. Every full clockwise turn increases the
differential by 1.5 psig (10 kPa).
50
38AH044-084 OPTIONAL SINGLE-CIRCUIT UNITS:
MODULES 124A, 124B, 134A, AND 134B
NOTE: This sequence of operation assumes that 2 thermostats
control units 38AH124 or 134 with one thermostat controlling
each module.
If compressor A1 is insufficient for the cooling requirements, the thermostat second stage closes, which opens the liquid line solenoid valve LLS-A2. Compressor A2 starts only after D-D2 contacts in the timer close and the suction pressure is
sufficient to close the capacity control switches.
ALL UNITS — When the fan switch is set for automatic
(AUTO) operation, the indoor-fan contactor (IFC) is cycled
with the lead compressor. If the fan switch is set for continuous
(CONT), the IFC is energized as long as the unit power is on.
CAUTION
Harsh chemicals, household bleach or acid or basic cleaners should not be used to clean outdoor or indoor coils of
any kind. These cleaners can be very difficult to rinse out
of the coil and can accelerate corrosion at the fin/tube interface where disimilar materials are in contact. If there is dirt
below the surface of the coil, use the Totaline environmentally sound coil cleaner as described above.
CAUTION
High velocity water from a pressure washer, garden
hose, or compressed air should never be used to clean a
coil. The force of the water or air jet will bend the fin
edges and increase airside pressure drop. Reduced unit
performance or nuisance unit shutdown may occur.
Condenser Coil Maintenance and Cleaning
Recommendation — Routine cleaning of coil surfaces
is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will
greatly increase the life of the coil and extend the life of the
unit. The following maintenance and cleaning procedures are
recommended as part of the routine maintenance activities to
extend the life of the coil.
REMOVE SURFACE LOADED FIBERS — Surface loaded fibers or dirt should be removed with a vacuum cleaner. If a
vacuum cleaner is not available, a soft non-metallic bristle
brush may be used. In either case, the tool should be applied in
the direction of the fins. Coil surfaces can be easily damaged
(fin edges bent over and damage to the coating of a protected
coil) if the tool is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a
surface loaded coil will drive the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded
fibers must be completely removed prior to using low velocity
clean water rinse.
PERIODIC CLEAN WATER RINSE — A periodic clean
water rinse is very beneficial for coils that are applied in
coastal or industrial environments. However, it is very important that the water rinse is made with very low velocity water
stream to avoid damaging the fin edges. Monthly cleaning as
described below is recommended.
ROUTINE CLEANING OF COIL SURFACES — Monthly
cleaning with Totaline® environmentally sound coil cleaner
is essential to extend the life of coils. This cleaner is available
from Carrier Replacement parts division as part number
P902-0301 for a one gallon container, and part number
P902-0305 for a 5 gallon container. It is recommended that all
coils, including standard aluminum, pre-coated, copper/copper,
or E-coated coils are cleaned with the Totaline environmentally sound coil cleaner as described below. Coil cleaning
should be part of the unit’s regularly scheduled maintenance
procedures to ensure long life of the coil. Failure to clean the
coils may result in reduced durability in the environment.
Avoid the use of:
• coil brighteners
• acid cleaning prior to painting
• high pressure washers
• poor quality water for cleaning
Totaline environmentally sound coil cleaner is nonflammable, hypoallergenic, non-bacterial, and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces
or insulation. Use of non-recommended coil cleaners is strongly
discouraged since coil and unit durability could be affected.
Totaline Environmentally Sound Coil Cleaner Application
Equipment
• 21/2 gallon garden sprayer
• Water rinse with low velocity spray nozzle
Totaline Environmentally Sound Coil Cleaner Application
Instructions
1. Proper eye protection such as safety glasses is recommended during mixing and application.
2. Remove all surface loaded fibers and dirt with a vacuum
cleaner as described above.
3. Thoroughly wet finned surfaces with clean water and a
low velocity garden hose, being careful not to bend fins.
4. Mix Totaline environmentally sound coil cleaner in a
21/2 gallon garden sprayer according to the instructions
included with the cleaner. The optimum solution temperature is 100 F.
NOTE: Do NOT USE water in excess of 130 F, as the enzymatic activity will be destroyed.
5. Thoroughly apply Totaline environmentally sound coil
cleaner solution to all coil surfaces including finned area,
tube sheets, and coil headers.
6. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid
spraying in horizontal pattern to minimize potential for
fin damage.
7. Ensure cleaner thoroughly penetrates deep into finned areas.
8. Interior and exterior finned areas must be thoroughly
cleaned.
9. Finned surfaces should remain wet with cleaning solution
for 10 minutes.
10. Ensure surfaces are not allowed to dry before rinsing. Reapply cleaner as needed to ensure 10-minute saturation is
achieved.
11. Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray nozzle.
Protect fins from damage from the spray nozzle.
Restart After Stoppage by Safety Control —
The high-pressure switch and the oil pressure switch must be
reset manually by breaking the control power supply at any of
the following points: control circuit fuse, fan motor circuit
breaker, or the thermostat. Restart follows the Time Guard
control delay.
Stoppage by low-pressure switch results in Time Guard
control delay, then unit attempts normal restart.
The compressor motor overcurrent protectors are manualreset circuit breakers. Reset of control circuit may also be
necessary.
51
Compressor Replacement — Perform the following:
Independent Refrigerant Circuit Controls —
Each refrigeration circuit is controlled by independent circuitry. Therefore, it is possible to maintain partial cooling
capability even if one compressor is inoperable.
NOTE: The 38AH044-084 optional single-circuit units do not
have independent control circuitry.
1. Reverse procedure in Compressor Removal section
from Step 9 through Step 5.
2. Reinstall service valves and safety switches, and
tighten to torques as listed:
Torque
Compressor(s)
Tighten discharge valves to —
20-25 ft-lb (27-34 N-m)
06E-250
80-90 ft-lb (109-122 N-m)
06E-265,275,299
Tighten suction valves to —
80-90 ft-lb (109-122 N-m)
06E-250
90-120 ft-lb (122-163 N-m) 06E-265,275,299
Tighten the following fittings as specified —
60 ft-lb (81 N-m)
Discharge Gas Thermostat
120 in.-lb (13.5 N-m)
High-Pressure Switch, FanCycling Pressure Switch
120 in.-lb (13.5 N-m)
Low-Pressure Switch
Compressor Removal — Access to the pump end of
the compressor is from the compressor side of the unit. Access
to the motor end of the compressor is from the inside of the
unit. All compressors can be removed from the compressor
side of the unit.
IMPORTANT: All compressor mounting hardware and
support brackets removed during servicing must be reinstalled prior to start-up.
1. Disconnect power to unit; lockout power to compressor.
2. Close suction and discharge service valves.
3. Relieve refrigerant pressure into a refrigerant recovery
system.
4. Remove:
• fan-cycling pressure switch (FCPS)
• high-pressure switch
• low-pressure switch
• oil-pressure switch
• discharge gas temperature switch
5. Disconnect power wires at terminal box and disconnect conduit.
6. Disconnect wires from crankcase heater.
7. Disconnect service valves from compressor.
NOTE: On 38AH044-084 optional single-circuit units
and units with 2 compressors per circuit, disconnect
both oil equalizer lines located on the motor barrel and
on the oil pump sump.
8. Units 38AH044-084, 124, and 134:
a. Remove 4 large screws securing compressor
mounting pan to unit base rail.
b. Slide compressor (on mounting pan) to outside of
unit frame; support and/or lower to ground.
c. Unbolt compressor from mounting pan and
remove.
9. Units 38AH094, 104:
a. Remove 4 large screws securing compressor to the
compressor rails.
b. Lift compressor off mounting bolts and remove.
3. Leak-check and evacuate system; recover refrigerant.
4. Recharge system per pre-start-up and start-up
sequences. Recheck oil levels.
5. Energize crankcase heater for 24 hours prior to restart
of system.
OIL CHARGE — (Refer to Table 3A, 3B, 4A, or 4B.) All
units are factory charged with oil. Acceptable oil level for each
compressor is from 1/8 to 1/3 up on the sight glass (see Fig. 32,
page 39).
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.
Approved oils are:
Totaline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Witco Suniso . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3GS
Shrieve Chemical . . . . . . . . . . . . . . . . . . . . . . . . . . . Zerol 150*
Texaco Ind. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WFI-32-150
IGI Petroleum Ind. . . . . . . . . . . . . . . . . . . . . . . . . . . .Cryol-150
*Alkyl Benzene Oil.
COMPRESSOR
06E-250
06E-265
06E-275
06E-299
OIL REQUIRED
pts
17
21
21
19
L
8.0
9.9
9.9
9.0
Do not reuse drained oil, and do not use any oil that has
been exposed to atmosphere.
Adjust oil level in accordance with Preliminary Oil Charge
section on page 40.
52
TROUBLESHOOTING
PROBLEM
COMPRESSOR DOES NOT RUN
Contactor Open
1. Power off.
2. Fuses blown in field power circuit.
3. No control power.
4. Thermostat circuit open.
5. Multi-function timer not operating.
6. Compressor circuit breaker tripped.
7. Safety device lockout circuit active.
8. Low-pressure switch open.
9. High-pressure switch open.
10. Loose electrical connections.
11. Compressor stuck.
Contactor Closed
1. Compressor leads loose.
2. Motor windings open.
3. Single phasing.
COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH
Outdoor Fan On
1. High-pressure switch faulty.
2. Airflow restricted.
3. Air recirculating.
4. Noncondensables in system.
5. Refrigerant overcharge.
6. Line voltage incorrect.
7. Refrigerant system restrictions.
Outdoor Fan Off
1. Fan slips on shaft.
2. Motor not running.
3. Motor bearings stuck.
4. Motor overload open.
5. Motor burned out.
COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH
Indoor-Air Fan Running
1. Filter drier plugged.
2. Expansion valve power head defective.
3. Low refrigerant charge.
Airflow Restricted
1. Coil iced up.
2. Coil dirty.
3. Air filters dirty.
4. Dampers closed.
Indoor-Air Fan Stopped
1. Electrical connections loose.
2. Fan relay defective.
3. Motor overload open.
4. Motor defective.
5. Fan belt broken or slipping.
SOLUTION
1. Restore power.
2. After finding cause and correcting, replace with correct size fuse.
3. Check secondary fuse(s); replace with correct type and size. Replace transformer if primary windings receiving power.
4. Check thermostat setting.
5. Check timer for proper operation; replace if defective.
6. Check for excessive compressor current draw. Reset breaker; replace if
defective.
7. Reset lockout circuit at thermostat or circuit breaker.
8. Check for refrigerant undercharge, obstruction of indoor airflow, or whether compressor suction shutoff valve is fully open. Make sure liquid line solenoid valve(s)
is open.
9. Check for refrigerant overcharge, obstruction of outdoor airflow, air in system or
whether compressor discharge valve is fully open. Be sure outdoor fans are
operating correctly.
10. Tighten all connections.
11. See 06E compressor service literature.
1. Check connections.
2. See 06E compressor service literature.
3. Check for blown fuse. Check for loose connection at compressor terminal.
1.
2.
3.
4.
5.
6.
7.
Replace switch.
Remove obstruction.
Clear airflow area.
Purge and recharge as required.
Purge as required.
Consult power company.
Check or replace filter drier, expansion valve, etc. Check that compressor
discharge valve is fully open.
1.
2.
3.
4.
5.
Tighten fan hub setscrews.
Check power and capacitor.
Replace bearings.
Check overload rating. Check for fan blade obstruction.
Replace motor.
1. Replace filter drier.
2. Replace power head.
3. Add charge. Check low-pressure switch setting.
1.
2.
3.
4.
Check refrigerant charge.
Clean coil fins.
Clean or replace filters.
Check damper operation and position.
1.
2.
3.
4.
5.
Tighten all connections.
Replace relay.
Power supply.
Replace motor.
Replace or tighten belt.
53
TROUBLESHOOTING (cont)
PROBLEM
COMPRESSOR STOPS ON OIL PRESSURE SWITCH
1. Oil level too low or too high.
2. Compressor is short cycling.
3.
4.
5.
6.
7.
8.
Crankcase heater off.
Low refrigerant charge.
Refrigerant floodback.
Evaporator coil is blocked or iced.
Evaporator fan not operating.
Distributor and/or TXV (thermostatic expansion valve) too
large.
9. Suction riser too large.
10. Defective oil pressure switch.
11. Plugged oil pump inlet screen.
12. Faulty oil pump drive segment.
13. Worn oil pump.
14. Worn compressor bearings.
COMPRESSOR RUNNING BUT COOLING INSUFFICIENT
Suction Pressure Low
1. Refrigerant charge low.
2. Head pressure low.
3. Air filters dirty.
4. Expansion valve power head defective.
5. Indoor coil partially iced.
6. Indoor airflow restricted.
Suction Pressure High
1. Unloaders not functioning.
2. Compressor valve defective.
3. Heat load excessive.
UNIT OPERATES TOO LONG OR CONTINUOUSLY
1. Low refrigerant charge.
2. Control contacts fused.
3. Air in system.
4. Partially plugged expansion valve or filter drier.
SYSTEM IS NOISY
1. Piping vibration.
2. Compressor noisy.
COMPRESSOR LOSES OIL
1. Leak in system.
2. Crankcase heaters not energized during shutdown.
3. Improper interconnecting piping design.
FROSTED SUCTION LINE
1. Expansion valve admitting excess refrigerant.
HOT LIQUID LINE
1. Shortage of refrigerant due to leak.
2. Expansion valve opens too wide.
FROSTED LIQUID LINE
1. Restricted filter drier.
COMPRESSOR WILL NOT UNLOAD
1. Defective unloader.
2. Defective capacity control solenoid valve (if used).
3. Miswired capacity control liquid line solenoid (if used).
4. Weak, broken, or wrong valve body spring.
COMPRESSOR WILL NOT LOAD
1. Miswired capacity control liquid line solenoid (if used).
2. Defective capacity control solenoid valve (if used).
3. Plugged strainer (high side).
4. Stuck or damaged unloader piston or piston ring(s).
SOLUTION
1. Check oil level requirements; adjust oil level until sight glass is filled 1/8
to 1/3 when running.
2. Check for
a) Thermostat location and operation.
b) Safety device lockout circuit operation.
c) End-of-cycle control and timer operation.
d) Low-pressure switch and relay operation.
3. Check relay operation; replace crankcase heater(s), if defective.
4. Adjust charge as required.
5. Adjust TXV (thermostatic expansion valve) superheat.
6. Check and correct as required.
7. Check and correct as required.
8. Check sizing at design conditions; change if incorrect for current
application.
9. Check line sizing at minimum design condition; change piping if
incorrect.
10. Check switch for proper operation; check capillary lines for plugged
lines.
11. Clean oil pump screen.
12. Replace drive segment.
13. Replace bearing head assembly.
14. Replace compressor; see 06E service instructions.
1.
2.
3.
4.
5.
6.
Add refrigerant.
Check refrigerant charge. Check outdoor-air fan thermostat settings.
Clean or replace filters.
Replace power head.
Check low-pressure setting.
Remove obstruction.
1. Check unloader adjustments. Check unloader setting.
2. See 06E compressor service literature.
3. Check for open doors or windows in vicinity of fan coil.
1.
2.
3.
4.
Add refrigerant.
Replace control.
Purge and evacuate system.
Clean or replace.
1. Support piping as required.
2. Check valve plates for valve noise. Replace compressor if bearings are
worn.
1. Repair leak.
2. Check wiring and relays. Check heater and replace if defective.
3. Check piping for oil return. Replace if necessary.
1. Adjust expansion valve.
1. Repair leak and recharge.
2. Adjust expansion valve.
1. Remove restriction or replace.
1.
2.
3.
4.
Replace unloader.
Replace valve.
Rewire correctly.
Replace spring.
1.
2.
3.
4.
Rewire correctly.
Replace valve.
Clean or replace strainer.
Clean or replace the necessary parts.
Copyright 2009 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53380004-01
Printed in U.S.A.
Form 38AH-22SI
Pg 54
612 3-09
Replaces: 38AH-20SI
START-UP CHECKLIST
I. PRELIMINARY INFORMATION
OUTDOOR: MODEL NO. ______________________________ SERIAL NO. ________________________________
INDOOR: AIR HANDLER MANUFACTURER _________________________________________________________
MODEL NO. ______________________________ SERIAL NO. ________________________________
ADDITIONAL ACCESSORIES ____________________________________________________________________
II. PRE-START-UP
OUTDOOR UNIT
IS THERE ANY SHIPPING DAMAGE? ________________
(Y/N) _____
IF SO, WHERE: _______________________________________________________________________________
WILL THIS DAMAGE PREVENT UNIT START-UP?
(Y/N) _____
CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT?
HAS THE GROUND WIRE BEEN CONNECTED?
(Y/N) _____
(Y/N) _____
HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY?
(Y/N) _____
ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY?
(Y/N) _____
HAVE COMPRESSOR HOLDDOWN BOLTS BEEN LOOSENED?
(Y/N) _____
CONTROLS
ARE THERMOSTAT(S) AND INDOOR FAN CONTROL WIRING
CONNECTIONS MADE AND CHECKED?
(Y/N) _____
ARE ALL WIRING TERMINALS (including main power supply) TIGHT?
HAVE CRANKCASE HEATERS BEEN ENERGIZED FOR 24 HOURS?
(Y/N) _____
(Y/N) _____
INDOOR UNIT
HAS WATER BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE?
ARE PROPER AIR FILTERS IN PLACE?
(Y/N) _____
(Y/N) _____
HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT?
DO THE FAN BELTS HAVE PROPER TENSION?
(Y/N) _____
(Y/N) _____
PIPING
ARE LIQUID LINE SOLENOID VALVES LOCATED AT THE EVAPORATOR COILS AS REQUIRED?
(Y/N) _____
HAVE LEAK CHECKS BEEN MADE AT COMPRESSORS, CONDENSERS, EVAPORATORS,
TXVs (thermostatic expansion valves), SOLENOID VALVES, FILTER DRIERS, AND FUSIBLE PLUGS
WITH A LEAK DETECTOR?
(Y/N) _____
LOCATE, REPAIR, AND REPORT ANY LEAKS.
HAVE ALL COMPRESSOR SERVICE VALVES BEEN FULLY OPENED (BACKSEATED)?
ARE THE COMPRESSOR OIL SIGHT GLASSES SHOWING ABOUT 1/8 TO 1/3 FULL?
CHECK VOLTAGE IMBALANCE
LINE-TO-LINE VOLTS:
AB ______ V
AC ______ V
BC ______ V
(AB + AC + BC)/3 = AVERAGE VOLTAGE = _________ V
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE = _________ V
VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) = _________ %
IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM!
CALL LOCAL POWER COMPANY FOR ASSISTANCE.
CL-1
(Y/N) _____
(Y/N) _____
CHECK EVAPORATOR FAN SPEED AND RECORD.
CHECK CONDENSER FAN SPEED AND RECORD.
AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:
OIL PRESSURE
SUCTION PRESSURE
SUCTION LINE TEMP
DISCHARGE PRESSURE
DISCHARGE LINE TEMP
ENTERING CONDENSER AIR TEMP
LEAVING CONDENSER AIR TEMP
EVAP ENTERING AIR DB TEMP
EVAP ENTERING AIR WB TEMP
EVAP LEAVING AIR DB TEMP
EVAP LEAVING AIR WB TEMP
COMPRESSOR AMPS (L1)
COMPRESSOR AMPS (L2)
COMPRESSOR AMPS (L3)
COMP A1
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
COMP A2
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
COMP B1
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
COMP B2
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
__________
CHECK THE COMPRESSOR OIL LEVEL SIGHT GLASSES; ARE THE SIGHT GLASSES SHOWING
OIL LEVEL AT 1/8 TO 1/3 FULL?
(Y/N) _____
NOTES:
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
______________________________________________________________________________________________
Copyright 2009 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53380004-01
Printed in U.S.A.
Form 38AH-22SI
Pg CL-2
612 3-09
Replaces: 38AH-20SI
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - CUT ALONG DOTTED LINE
CUT ALONG DOTTED LINE
III. START-UP
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