Carrier 38Ah044 084 Users Manual

38AH044-084 to the manual 1ec8522d-b3b8-49ce-b05f-c705fe552dd5

2015-01-24

: Carrier Carrier-38Ah044-084-Users-Manual-310416 carrier-38ah044-084-users-manual-310416 carrier pdf

Open the PDF directly: View PDF .
Page Count: 56

Installation, Start-Up and

Service Instructions

CONTENTS Page

SAFETY CONSIDERATIONS ................ 1

INSTALLATION ............................ 1-37

Step 1 — Rig and Place Unit ............... 1

• DOMESTIC UNITS

• EXPORT UNITS

• PLACING UNITS

Step 2 — Check Compressor Mounting ..... 3

• UNITS 38AH044-084

• UNITS 38AH094-134

Step 3 — Make Refrigerant Piping

Connections .............................. 14

• UNITS 38AH044-084

• UNITS 38AH094-134

Step 4 — Make Electrical Connections ...... 23

• POWER SUPPLY

• FIELD POWER CONNECTIONS

• MAIN POWER

• CONTROL CIRCUIT WIRING

Step 5 — Install Accessories ............... 37

• LOW-AMBIENT OPERATION

• MISCELLANEOUS ACCESSORIES

PRE-START-UP .......................... 37,38

START-UP ................................38-45

SERVICE ..................................46-49

CONTROL ................................49-52

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 compo-

nents, 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 func-

tions, 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.

ELECTRIC SHOCK HAZARD.

Open all remote disconnects before servicing

this equipment.

INSTALLATION

Step 1 — Rig and Place Unit — All units are

designed 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 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.

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 pro-

tection packaging in place during rigging to provide protec-

tion 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.

PLACING UNITS

Units 38AH044-084 — Refer to Fig. 1 and 2 for airﬂow clear-

ances. 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.

Do not forklift these units unless the unit is attached to

a skid designed for forklifting.

38AH044-134

Air-Cooled Condensing Units

50/60 Hz

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 1

Tab 3a

PC 111 Catalog No. 563-704 Printed in U.S.A. Form 38AH-15SI Pg 1 10-98 Replaces: 38AH-14SI

The placement area must be level and strong enough to

support the operating weight of the unit (see Table 3A or

3B). 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, a perim-

eter support channel between the unit and the isolators is

recommended. Fasteners for mounting unit are ﬁeld sup-

plied. Be sure to mount unit level to ensure proper oil return

to compressors.

Units 38AH094-134 — Refer to Fig. 3-6 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 suc-

tion lines to indoor unit. For multiple units, allow

8 ft (2440 mm) separation between units for airﬂow and

service.

Do not forklift these units unless the unit is attached to

a skid designed for forklifting.

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 place-

ment of the unit.

Units 38AH094,104 — For mounting units on vibration iso-

lators, a perimeter support channel is required between the

unit and the support isolators. The perimeter support chan-

nel must be sized to support the fully assembled unit. Do not

support units on individual isolation supports. Support chan-

nel, 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. 7.

Do not move assembled 38AH124 or 134 units as a single

assembly. Always move modules individually during in-

stallation or at any other time.

Mark installation site for placement of Modules 124A and

124B or Modules 134A and 134B. See Table 4A or 4B 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. 8.

Remove sheet metal and tubing from Module 124Aor 134A

sheet metal trim kit (Fig. 7). Remove sheet metal cover pan-

els from return-bend end of unit facing the service space.

See Fig. 8. These panels may be discarded or saved for

reinstallation if module is moved from site. See Fig. 9.

Table 1 — Rigging Center of Gravity — in. (mm)

UNIT

38AH 044 054 064 074 084 094 104 MODULE

124A MODULE

124B MODULE

134A MODULE

134B

Dimension X 49 (1232) 48 (1224) 50 (1260) 57 (1443) 57 (1448) 66 (1676) 63 (1600) 50 (1260) — 50 (1260) —

Dimension Y 39 (984) 39 (978) 38 (968) 39 (993) 39 (991) 31 (787) 34 (851) 38 (968) — 38 (968) —

Dimension X-C 49 (1234) 48 (1229) 50 (1261) 56 (1425) 56 (1422) 66 (1676) 63 (1600) 50 (1260) — 50 (1260) —

Dimension Y-C 39 (993) 39 (991) 39 (986) 40 (1006) 40 (1008) 31 (787) 34 (851) 39 (986) — 39 (986) —

Dimension K ————————50(1260) — 57 (1443)

Dimension L ————————38(968) — 39 (993)

Dimension K-C ————————50(1260) — 56 (1425)

Dimension L-C ————————39(986) — 40 (1006)

LEGEND

——Not Applicable

C—Copper Fin Coils

TOP VIEW, TYPICAL 124, 134 ONLY

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.

IMPORTANT: Modules must be placed 24 in.

(610 mm) apart and square relative to each other.

The modules are now in position for piping installa-

tion and ﬁnal assembly. See Fig. 8. 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 iso-

lation 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.

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. 10.

UNITS 38AH094-134 — Units 38AH094 and 104 compres-

sors are mounted on rails and held down by rail bolts during

shipment. After unit is installed, loosen the rail bolts to al-

low the rails and compressors to ﬂoat freely on the springs

located under the rails. See Fig. 10.

Units 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. 10.

Table 2A — Operational Corner Weights with

Refrigerant Charge (Approximate) — Lb

UNIT

38AH TOTAL

WEIGHT OPERATIONAL CORNER WEIGHT

ABCD

044 3259 939 893 695 732

044C 3547 1013 967 765 802

054 3309 964 905 697 742

054C 3597 1034 978 771 814

064 3565 1018 1011 765 771

064C 3998 1125 1117 874 879

074 3812 1146 986 777 903

074C 4229 1272 1059 862 1035

084 4057 1220 1049 827 961

084C 4735 1425 1186 965 1159

094 5088 1114 2192 1182 601

094C 5813 1273 2504 1350 686

104 5435 1240 2138 1302 755

104C 6160 1405 2423 1476 856

MODULE

38AH

124A 3630 1037 1030 779 785

124A-C 4063 1144 1137 889 894

124B 3630 1037 1030 779 785

124B-C 4063 1144 1137 889 894

134A 3630 1037 1030 779 785

134A-C 4063 1144 1137 889 894

134B 3877 1167 997 789 924

134B-C 4294 1293 1080 874 1047

LEGEND

C—Copper Fin Coils

NOTE: Total weight may differ from summation of corner weights due

to rounding of numerals.

Table 2B — Operational Corner Weights with

Refrigerant Charge (Approximate) — Kg

UNIT

38AH TOTAL

WEIGHT OPERATIONAL CORNER WEIGHT

ABCD

044 1478 426 405 316 332

044C 1609 460 438 347 364

054 1501 437 411 316 337

054C 1632 469 444 350 369

064 1617 462 459 347 350

064C 1813 510 508 397 399

074 1729 520 447 352 410

074C 1918 577 481 391 470

084 1840 553 476 375 436

084C 2148 646 538 438 526

094 2308 505 994 536 272

094C 2637 577 1136 612 311

104 2465 562 970 591 342

104C 2794 637 1099 670 388

MODULE

38AH

124A 1647 470 467 353 356

124A-C 1843 519 516 403 405

124B 1647 470 467 353 356

124B-C 1843 519 516 403 405

134A 1647 470 467 353 356

134A-C 1843 519 516 403 405

134B 1759 529 452 358 419

134B-C 1948 587 490 396 475

LEGEND

C—Copper Fin Coils

NOTE: Total weight may differ from summation of corner weights due

to rounding of numerals.

TOP VIEW, TYPICAL

DUAL CKT SINGLE CKT

SUCTION

CONNECTION(S) 2

⁄

9Dia [54 mm] 2

⁄

9Dia [67 mm]

LIQUID

CONNECTION(S)

⁄

9Dia [22 mm] 1

⁄

9Dia [29 mm]

SUCTION C 28-

⁄

9[627mm] 18-10

⁄

9[567mm]

LIQUID D 18-10

⁄

9[561mm] 18-10

⁄

9[567mm]

SUCTION (Ckt A) 18-7

⁄

9[503mm] 28-

⁄

9[626mm]

SUCTION (Ckt B) 28-

⁄

9[626mm] —

LIQUID (Ckt A) 28-5

⁄

9[756mm] 28-10

⁄

9[879mm]

LIQUID (Ckt B) 28-10

⁄

9[879mm] —

NOTES:

1. The approximate operating weight of the unit is:

38AH-044--- 3259 lb [1478 kg]

38AH-044--C 3547 lb [1609 kg]

38AH-054--- 3309 lb [1501 kg]

38AH-054--C 3597 lb [1632 kg]

38AH-064--- 3565 lb [1617 kg]

38AH-064--C 3998 lb [1813 kg]

2. Unit must have clearances for airﬂow as follows:

Top — Do not restrict in any way.

Ends—5ft[1524 mm]

Sides—6ft[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. One 3

⁄

9(92 mm) diameter hole is recommended for single-entry power on size 064 (208/230-v) units.

5. See Table 1 for rigging center of gravity (Dimensions X,Y). See Table 2A and 2B forA-D corner weights.

6. Circled numerals in Top View refer to condenser fans by position.

Chart 1, Field Power Supply Connections

UNIT VOLTAGE Hz DIAMETER — in. [mm] QTY

044 230 50 3

⁄

[92] 1

044, 054 208/230 60 3

⁄

[92] 1

346, 380/415 50 2

⁄

[63] 1

044, 054, 064 460,575,380 60 2

⁄

[63] 1

064 208/230 60 2

⁄

[63] 2

346, 380/415 50 3

⁄

[92] 1

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

Fig. 1 — Dimensions — Units 38AH044,054,064

DUAL CKT SINGLE CKT

SUCTION

CONNECTION(S) 2

⁄

9Dia [54 mm] 2

⁄

9Dia [67 mm]

LIQUID

CONNECTION(S)

⁄

9Dia [22 mm] 1

⁄

9Dia [29 mm]

SUCTION C 28-

⁄

9[627mm] 18-10

⁄

9[567mm]

LIQUID D 18-10

⁄

9[561mm] 18-10

⁄

9[567mm]

SUCTION (Ckt A) 18-7

⁄

9[503mm] 28-

⁄

9[626mm]

SUCTION (Ckt B) 28-

⁄

9[626mm] —

LIQUID (Ckt A) 28-5

⁄

9[756mm] 28-10

⁄

9[879mm]

LIQUID (Ckt B) 28-10

⁄

9[879mm] —

Chart 1, Field Power Supply Connections

UNIT VOLTAGE Hz DIAMETER — in. [mm] QTY

074 208/230 60 2

⁄

[63] 2

460 60 2

⁄

[63] 1

074, 084

346, 380/415 50 3

⁄

[92] 1

380 60 3

⁄

[92] 1

575 60 2

⁄

[63] 1

084 208/230 60 3

⁄

[92] 2

460 60 3

⁄

[92] 1

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

NOTES:

1. The approximate operating weight of the unit is:

38AH-074--- 3812 lb (1729 kg)

38AH-074--C 4229 lb (1918 kg)

38AH-084--- 4057 lb (1840 kg)

38AH-084--C 4735 lb (2148 kg)

2. Unit must have clearances for airﬂow as follows:

Top — Do not restrict in any way.

Ends—5ft[1524 mm]

Sides—6ft[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 iso-

lators is recommended.

4. See Table 1 for rigging center of gravity (Dimensions X,Y). See Table 2A and 2B for A-D corner weights.

5. Circled numerals in Top View refer to condenser fans by position.

Fig. 2 — Dimensions — Units 38AH074,084

Chart 1, Field Power Supply Connections

UNIT

38AH VOLTAGE Hz DIAMETER — in. (mm) QUANTITY

094

208/230 60 3

⁄

(92) 2

460, 575,

380 60 3

⁄

(92) 1

346, 380/415 50 3

⁄

(92) 1

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

NOTES:

1. The approximate operating weight of the unit is:

38AH-094--- 5088 lb (2308 kg)

38AH-094--C 5813 lb (2637 kg)

2. Unit must have clearances for airﬂow as follows:

Top — Do not restrict in any way.

Ends—5ft[1524 mm]

Sides—6ft[1829 mm]

3. Mounting holes may be used to mount unit to concrete pad. They are not

recommended for mounting unit to spring isolators.

4. Two 3

⁄

9(92-mm) dia holes are recommended for parallel conductors on

208/230 v units.

5. Circled numerals in Top View refer to condenser fans by position.

6. If spring isolators are used, a perimeter support channel between the unit

and the isolators is recommended.

7. See Table 1 for rigging center of gravity (Dimensions X,Y). See Table 2A

and 2B for A-D corner weights.

Fig. 3 — Dimensions — Unit 38AH094

Chart 1, Field Power Supply Connections

UNIT

38AH VOLTAGE Hz DIAMETER — in. (mm) QUANTITY

104

208/230 60 3

⁄

(92) 2

460, 575,

380 60 3

⁄

(92) 1

346, 380/415 50 3

⁄

(92) 1

Fig. 4 — Dimensions — Unit 38AH104

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

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—5ft[1524 mm]

Sides—6ft[1829 mm]

3. Mounting holes may be used to mount unit to concrete pad. They are not

recommended for mounting unit to spring isolators.

4. Two 3

⁄

9(92-mm) dia holes are recommended for parallel conductors on

208/230 v units.

5. Circled numerals in Top View refer to condenser fans by position.

6. If spring isolators are used, a perimeter support channel between the unit

and the isolators is recommended.

7. See Table 1 for rigging center of gravity (Dimensions X,Y). See Table 2A

and 2B for A-D corner weights.

Chart 1, Field Power Supply Connections

UNIT

38AH VOLTAGE Hz DIAMETER

(in.) QUANTITY

124A

124B

208/230 60 3

⁄

(92) 1

460, 575,

380 60 2

⁄

(63) 1

346, 380/415 50 3

⁄

(92) 1

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

NOTES:

1. The approximate operating weight of the unit is:

38AH-124--- 7260 lb (3293 kg)

38AH-124--C 8126 lb (3686 kg)

2. Unit must have clearances for airﬂow as follows:

Top — Do not restrict in any way.

Ends—5ft[1524 mm]

Sides—6ft[1829 mm]

3. Mounting holes may be used to mount unit to concrete pad. They are not rec-

ommended for mounting unit to spring isolators.

4. One 3

⁄

9(92-mm) dia hole is recommended for single-entry power into each

module (124A and 124B) of the 208/230-v units.

5. Circled numerals in Top View refer to condenser fans by position.

6. If spring isolators are used, a perimeter support channel between the unit and

the isolators is recommended. Do not support each module separately.

7. Each module of the unit must be rigged into position separately. The unit must

not be rigged after modules have been connected.

8. Suction and liquid connections can exit on either side of the unit.

9. Field power supply connections are required for each module.

10. See Table 1 for rigging center of gravity (Dimensions K,L,X,Y). See Table 2A

and 2B for A-D corner weights.

Fig. 5 — Dimensions — Unit 38AH124

Chart 1, Field Power Supply Connections

UNIT

38AH VOLTAGE Hz DIAMETER —

in. (mm) QUANTITY

134A

208/230 60 3

⁄

(92) 1

460, 575, 380 60 2

⁄

(63) 1

346, 380/415 50 3

⁄

(92) 1

134B

208/230 60 2

⁄

(63) 2

460, 575 60 2

⁄

(63) 1

380 60 3

⁄

(92) 1

346, 380/415 50 3

⁄

(92) 1

LEGEND

C—Copper Fin Coils

MTG — Mounting

SAE — Society of Automotive Engineers

NOTES:

1. The approximate operating weight of the unit is:

38AH-134--- 7507 lb (3405 kg)

38AH-134--C 8357 lb (3791 kg)

2. Unit must have clearances for airﬂow as follows:

Top — Do not restrict in any way.

Ends—5ft[1524 mm]

Sides—6ft[1829 mm]

3. Mounting holes may be used to mount unit to concrete pad. They are not

recommended for mounting unit to spring isolators.

4. One 3

⁄

9(92-mm) dia hole is recommended for single-entry power into

Module 134A and 208/230-v units. Single entry power into Module 134B is

not recommended.

5. Circled numerals in Top View refer to condenser fans by position.

6. If spring isolators are used, a perimeter support channel between the as-

sembled unit and the isolators is recommended. Do not support each mod-

ule separately.

7. Each module of the unit must be rigged into position separately. The unit

must not be rigged after modules have been connected.

8. Suction and liquid connections can exit on either side of the unit.

9. Field power supply connections are required for each module.

10. See Table 1A or 1B for rigging center of gravity (Dimensions K,L,X,Y). See

Table 2A and 2B for A-D corner weights.

Fig. 6 — Dimensions — Unit 38AH134

Table 3A — Units 38AH044-084 Physical Data — 50/60 Hz (English)

38AH 044 054 064 074 084

OPERATING WEIGHT WITH Cu-Al 3259 3309 3565 3812 4057

REFRIGERANT (Approx) — Lb Cu-Cu 3547 3597 3998 4229 4735

SHIP WEIGHT WITH COIL PROTECTION ONLY

(Approx) — Lb Cu-Al 3250 3290 3530 3780 4000

Cu-Cu 3538 3578 3963 4197 4678

TYPICAL OPERATING REFRIGERANT R-22

Charge (Approx) — Lb 62 72 88 104 130

Qty of Circuits Std 22222

Opt 11111

COMPRESSOR Type...Rpm Reciprocating Semi-Hermetic...1750 @ 60 Hz; 1458 @ 50 Hz

(Qty Cylinder) Compressor* Std (4) A1 (4) B1 (4) A1 (6) B1 (6) A1 (6) B1 (6) A1 (6) B1 (6) A1 (6) B1

Model No. 06E Std 250 250 250 265 265 275 275 299 299 299

(Qty Cylinder) Compressor* Opt (4) A1 (4) A2 (6) A1 (4) A2 (6) A1 (6) A2 (6) A1 (6) A2 (6) A1 (6) A2

Model No. 06E Opt 250 250 265 250 275 265 299 275 299 299

Oil Charge (Pt) Std 17 17 17 21 21 21 21 19 19 19

Opt 17 17 21 17 21 21 19 21 19 19

Capacity Control Steps† 4

CONDENSER FANS (6 Blade) — 60 Hz

Qty...Dia (in.) 4...30 6...30

Airﬂow (Cfm) 35,000 52,000 51,000

Speed (Rpm) 1140 1140

Total Power (kW) 6.2 9.3

CONDENSER FANS (6 Blade) — 50 Hz

Qty...Dia (in.) 4...30 6...30

Airﬂow (Cfm) 35,000 52,000 51,000

Speed (Rpm) 950 950

Total Power (kW) 6.2 9.3

CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fin

Rows...Fins per in. 2...17 2...17 3...17 2...19 3...17

Face Area (sq ft) 80.5 80.5 80.5 116.7 116.7

Storage Capacity (Lb per Circuit) at 120 F 35 35 55 55 80

CONNECTIONS

Suction, ODF (in.)** 2

⁄

Liquid, ODF (in.)**

⁄

Hot Gas Bypass, ODF (in.)

⁄

Table 3B — Units 38AH044-084 Physical Data — 50/60 Hz (SI)

38AH 044 054 064 074 084

OPERATING WEIGHT WITH Cu-Al 1478 1501 1617 1729 1840

REFRIGERANT (Approx) — Kg Cu-Cu 1609 1632 1813 1918 2148

SHIP WEIGHT WITH COIL PROTECTION ONLY

(Approx) — Kg Cu-Al 1474 1492 1601 1715 1814

Cu-Cu 1605 1623 1798 1904 2122

TYPICAL OPERATING REFRIGERANT R-22

CHARGE (Approx) — Kg 28.1 32.7 39.9 47.2 58.9

Qty of Circuits Std 22222

Opt 11111

COMPRESSOR Type...R/s Reciprocating Semi-Hermetic...29.2 @ 60 Hz; 24.3 @ 50 Hz

(Qty Cylinder) Compressor* Std (4) A1 (4) B1 (4) A1 (6) B1 (6) A1 (6) B1 (6) A1 (6) B1 (6) A1 (6) B1

Model No. 06E Std 250 250 250 265 265 275 275 299 299 299

(Qty) Cylinder) Compressor* Opt (4) A1 (4) A2 (6) A1 (4) A2 (6) A1 (6) A2 (6) A1 (6) A2 (6) A1 (6) A2

Model No. 06E Opt 250 250 265 250 275 265 299 275 299 299

Oil Charge (L) Std 8.0 8.0 8.0 9.9 9.9 9.9 9.9 9.0 9.0 9.0

Opt 8.0 8.0 9.9 8.0 9.9 9.9 9.0 9.9 9.0 9.0

Capacity Control Steps† 4

CONDENSER FANS (6 Blade) — 50 Hz

Qty...Dia (mm) 4...762 6...762

Airﬂow (L/s) 16,500 24,500 24,100

Speed (R/s) 15.8 15.8

Total Power (kW) 6.2 9.3

CONDENSER FANS (6 Blade) — 60 Hz

Qty...Dia (mm) 4...762 6...762

Airﬂow (L/s) 16,500 24,500 24,100

Speed (R/s) 19.0 19.0

Total Power (kW) 6.2 9.3

CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fin

Rows...Fins per m 2...669 2...669 3...669 2...782 3...669

Face Area (sq m) 7.48 7.48 7.48 10.84 10.84

Storage Capacity (Kg per Circuit) at 48.9 C 16 16 25 25 36

CONNECTIONS

Suction, ODF (in.)** 2

⁄

Liquid, ODF (in.)**

⁄

Hot Gas Bypass, ODF (in.)

⁄

LEGEND

Cu-Al — Copper tubes with aluminum ﬁns

Cu-Cu — Copper tubes with copper ﬁns

ODF — Outside Diameter, Female

Opt — Optional Single-Circuit Units

Std — Standard Dual-Circuit Units

*Compressor A1 is lead on standard and optional single-circuit units.

†Capacity control steps listed are for constant-volume units with no accesso-

ries. Refer to Table 19A or 19B, page 48, for additional system capacity

information.

**For single-circuit units, suction ODF is 2

⁄

in. (66.7 mm) and liquid ODF is

⁄

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:

in. mm

⁄

15.9

⁄

22.2

⁄

54.0

Table 4A — Units 38AH094-134 Physical Data — 50/60 Hz (English)

38AH 094 104 124 134

124A 124B 134A 134B

OPERATING WEIGHT WITH Cu-Al 5088 5435 3630* 3630* 3630* 3877*

REFRIGERANT (Approx) — Lb Cu-Cu 5813 6160 4063* 4063* 4063* 4294*

SHIP WEIGHT WITH Cu-Al 5630 5990 3907* 3907* 3907* 4080*

COIL PROTECTION AND SKID Cu-Cu 6355 6715 4340* 4340* 4340* 4497*

(Approx) — Lb

TYPICAL OPERATING

REFRIGERANT CHARGE R-22

(Approx) — Lb 148 135 88 88 88 104

Qty of Circuits 2 2 1111

COMPRESSOR Type...Rpm Reciprocating Semi-Hermetic...1750 @ 60 Hz; 1460 @ 50 Hz

(Qty Cylinder) Compressor† (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

Model No. 06E −275 −250 −299 −265 −250 −265 −265 −275 −265 −275 −265 −275 −265 −299 −275

Oil Charge (Pt) 21 17 19 21 17 21 21 21 21 21 21 21 21 19 21

Capacity Control Steps** 5 6 3333

CONDENSER FANS (6 Blade) — 60 Hz

Qty...Dia (in.) 6...30 6...30 4...30 4...30 4...30 6...30

Airﬂow (Cfm) 52,000 52,000 35,000 35,000 35,000 52,000

Speed (Rpm) 1140 1140 1140 1140 1140 1140

Total Power (kW) 9.4 9.5 6.4 6.4 6.4 9.2

CONDENSER FANS (6 Blade) — 50 Hz

Qty...Dia (in.) 6...30 6...30 4...30 4...30 4...30 6...30

Airﬂow (Cfm) 52,000 52,000 35,000 35,000 35,000 52,000

Speed (Rpm) 950 950 950 950 950 950

Total Power (kW) 9.4 9.5 6.4 6.4 6.4 9.2

CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fin

Rows...Fins per in. 3...17 3...17 3...17 3...17 3...17 2...19

Face Area (sq ft) 128.3 128.3 80.5 80.5 80.5 116.7

Storage Capacity

(Lb per circuit) at 120 F 178 178 110 110 110 110

CONNECTIONS

Suction, ODF (in.) 2

⁄

Liquid, ODF (in.)

⁄

Hot Gas Bypass, ODF (in.)

⁄

Table 4B — Units 38AH094-134 Physical Data — 50/60 Hz (SI)

38AH 094 104 124 134

124A 124B 134A 134B

OPERATING WEIGHT WITH Cu-Al 2308 2465 1647* 1647* 1647* 1759*

REFRIGERANT (Approx) — Kg Cu-Cu 2637 2794 1843* 1843* 1843* 1948*

SHIP WEIGHT WITH Cu-Al 2554 2717 1860* 1860* 1860* 1851*

COIL PROTECTION AND SKID Cu-Cu 2883 3046 1968* 1968* 1968* 1968*

(Approx) — Kg

TYPICAL OPERATING

REFRIGERANT CHARGE R-22

(Approx) — Kg 67.1 61.2 39.9 39.9 39.9 47.2

Qty of Circuits 2 2 1111

COMPRESSOR Type...R/s Reciprocating Semi-Hermetic...29.2 @ 60 Hz; 24.3 @ 50 Hz

(Qty Cyliner) Compressor† (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

Model No. 06E −275 −250 −299 −265 −250 −265 −265 −275 −265 −275 −265 −275 −265 −299 −275

Oil Charge (L) 10 8 9 10 8 1010101010101010 9 10

Capacity Control Steps** 5 6 3333

CONDENSER FANS (6 Blade) — 60 Hz

Qty...Dia (mm) 6...762 6...762 4...762 4...762 4...762 6...762

Airﬂow (L/s) 24,544 24,544 16,520 16,520 16,520 24,544

Speed (R/s) 19 19 19 19 19 19

Total Power (kW) 9.4 9.5 6.4 6.4 6.4 9.2

CONDENSER FANS (6 Blade) — 50 Hz

Qty...Dia (mm) 6...762 6...762 4...762 4...762 4...762 6...762

Airﬂow (L/s) 24,544 24,544 16,520 16,520 16,520 24,544

Speed (R/s) 15.8 15.8 15.8 15.8 15.8 15.8

Total Power (kW) 9.4 9.5 6.4 6.4 6.4 9.2

CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fin

Rows...Fins per m 3...669.3 3...669.3 3...669.3 3...669.3 3...669.3 2...781.6

Face Area (sq m) 11.9 11.9 7.5 7.5 7.5 10.8

Storage Capacity

(Kg per circuit) at 49 C 81 81 50 50 50 50

CONNECTIONS

Suction, ODF (in.) 2

⁄

Liquid, ODF (in.)

⁄

Hot Gas Bypass, ODF (in.)

⁄

LEGEND

Cu-Al — Copper Tubes with Aluminum Fins

Cu-Cu — Copper Tubes with Copper Fins

ODF — Outside Diameter, Female

*Includes piping and trim kit.

†Compressors are shipped with minimum oil charge.

**Capacity control steps listed are for constant volume units with no accesso-

ries. Refer to Table 20, page 48, 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:

in. mm

⁄

15.9

⁄

22.2

⁄

28.6

⁄

54.0

⁄

66.7

Fig. 7 — Modules 38AH124A or 134A — Shipping Locations of Piping

and Sheet Metal Trim Kit

RIG

HERE

RIG

HERE

RIG

HERE

RIG

HERE

CONTROL

BOX

SHEET METAL COVER

PANEL (REMOVED)

24-in. (610-mm)

SERVICE SPACE

Fig. 8 — Correct Placement of Modules Without Piping

and Sheet Metal Trim (Unit 38AH134 Shown)

FACTORY-

INSTALLED

SUCTION

LINE LOOP

Fig. 9A — Typical Module with Cover

Panels Removed

Fig. 9B — Field-Installed Suction Line Loop

38AH044-084,124,134

MOUNTING SPRINGS

SHIPMENT BOLTS SHIPMENT BOLTS

38AH094,104

MOUNTING

BOLTS RAIL BOLT (3) (2 SHOWN)

RAIL BOLT (3) (2 SHOWN)

MOUNTING

BOLTS

Fig. 10 — Outer View, Compressor Mounting

Step 3 — Make Refrigerant Piping

Connections

The ﬁeld-supplied liquid line solenoid valve must be

installed at the evaporator to avoid possible compressor

damage during unit operation. See Fig. 11 (for 38AH044-

084 dual-circuit and 38AH094-134 units), or Fig. 12 (for

38AH044-084 optional single-circuit units).

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 evapo-

rator is shown in Table 5. Size suction lines in accordance

with Tables 6A or 6B through 9A or 9B and Fig. 13. Mount

liquid line solenoid valve just ahead of the TXVs (thermo-

static expansion valves) which will be mounted at the

evaporator. See Fig. 11 (for 38AH044-084 dual-circuit and

38AH094-134 units) or Fig. 12 (for 38AH044-084 optional

single-circuit units).

To achieve good mixing of the refrigerant leaving the evapo-

rator 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. 14 (for 38AH044-084

dual-circuit and 38AH094-134 units) or Fig. 15 (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 or 6B through 9A or 9B and Fig. 13.

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. 14 (for 38AH044-084

dual-circuit and 38AH094-134 units) or Fig. 15 (for 38AH044-

084 optional single-circuit units). When the compressor is

below the evaporator, the riser at the evaporator should ex-

tend to the top of the evaporator section. After the riser is

installed, the suction line can elbow down immediately.

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 11 (for 38AH044-

084 dual-circuit and 38AH094-134 units) or Fig. 12 (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.

Table 5 — Liquid Lift

UNIT

38AH

MAXIMUM LIQUID LIFT

60 Hz 50 Hz

FtMFtM

044 69 21.0 57.5 17.5

054 75 23.0 75.0 23.0

064 75 23.0 65.0 19.8

074 45 13.7 37.5 11.4

084 75 23.0 75.0 23.0

094 55 16.7 46.0 14.0

104 50 15.2 42.0 12.8

124 75 23.0 65.0 19.8

134 45 13.7 37.5 11.4

UNITS 38AH044-084 — Relieve the pressure caused by the

holding charge into a refrigerant recovery system. Uncap

the suction line and cut the run-around tube 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.

IMPORTANT: Protect the liquid valves from the heat

of brazing.

Leak test the entire system by using soap bubbles and

nitrogen or R-22 with an electronic leak detector.

Purge nitrogen or reclaim R-22 from system after com-

pletion 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.

UNITS 38AH094-134 — Relieve the R-22 holding charge

of each circuit into a refrigerant recovery system. Remove

the liquid line to factory-installed suction line loop by cut-

ting the loop at the liquid valve. (See Fig. 9A and 9B.) Cut

as close to the 90-degree bend in the loop as possible. The

remaining tube piece in the valve will be used for brazing

the liquid line. Unbraze and remove the cap from the liquid

line. For 38AH094 and 104 units, sweat-connect the liquid

and suction lines from the evaporator. For 38AH124 and 134

units, see Piping Kit Connections on page 21.

LEGEND

LLS — Liquid Line Solenoid

TXV — Thermostatic Expansion Valve

*Field-Supplied.Fig. 11 — Required Location of Solenoid Valves and Recommended Filter Drier and

Sight Glass Locations for 38AH044-084 Dual-Circuit and 38AH094-134 Units

*Field-Supplied.Fig. 12 — Required Location of Solenoid Valves and Recommended Filter Drier and

Sight Glass Locations for 38AH044-084 Optional Single-Circuit Units

LEGEND

A—Pipe A, Suction Riser, without Trap

B—Pipe B, Suction Riser with Trap

C—Suction Line to Condensing Unit

D—Pipe D, Suction Riser Short Lift

RED. — Reducer

STR — Street

NOTES:

1. Short riser, pipe D, is used when routing suction line to condens-

ing unit connection. See table at right.

2. See Tables 6A-9B for values of A, B, and C.

UNIT

38AH

PIPE D DIAMETER

Dual Circuit* Single Circuit*

in. mm in. mm in. mm

044 1

⁄

41 1

⁄

41 2

⁄

054 1

⁄

41 1

⁄

41 2

⁄

064 1

⁄

41 2

⁄

54 2

⁄

074 2

⁄

54 2

⁄

54 2

⁄

084 2

⁄

54 2

⁄

54 2

⁄

† 67†

094, 104 2

⁄

54 2

⁄

54 — —

124, 134 2

⁄

67 2

⁄

67 — —

*Maximum length of riser is 3 ft (914 mm).

†Double suction riser required if accessory unloader is ﬁeld

installed.

Fig. 13 — Double Suction Riser Construction

Table 6A — Refrigerant Piping Requirements — 38AH044-104 Dual-Circuit Units — 60 Hz

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

15-25

(4.6-7.6) 25-50

(7.6-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

LSLSL S L S L S L S

044 Ckt A

⁄

Ckt B

⁄

054 Ckt A

⁄

Ckt B

⁄

064 Ckt A

⁄

†

Ckt B

⁄

074 Ckt A

⁄

†1

⁄

†

Ckt B

⁄

084 Ckt A

⁄

†1

⁄

†1

⁄

†

Ckt B

⁄

094 Ckt A

⁄

†1

⁄

†1

⁄

†1

⁄

Ckt B

⁄

104 Ckt A

⁄

†1

⁄

†1

⁄

†1

⁄

Ckt B

⁄

** 1

⁄

LEGEND

L—Liquid Line

S—Suction Line

*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 condens-

ing unit is elevated above evaporator.

NOTES:

1. Addition of 2 unloaders to circuit B compressor is not

recommended.

2. 38AH094 and 38AH104 piping sizes apply only to factory sup-

plied 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) satu-

rated suction temperature (SST). When operating below 40 F

(4.4 C), refer to Carrier System Design Manual, E20-IITpiping de-

sign program, or ASHRAE Handbook to select proper line sizes.

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:

in. 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

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

ABCABCABCABC

054 Ckt A ————————————

Ckt B —————————1

⁄

064 Ckt A —————————1

⁄

Ckt B ————————————

074 Ckt A ——————1

⁄

Ckt B ————————————

084 Ckt A ———1

⁄

Ckt B ————————————

094 Ckt A 1

⁄

Ckt B ————————————

104 Ckt A 1

⁄

Ckt B ——————1

⁄

LEGEND

——Not Required

Pipe A — Suction Riser Without Trap

Pipe B — Suction Riser With Trap

Pipe C — Suction Line to Condensing Unit

NOTES:

1. See Refrigerant Piping Requirements table 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.

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 pen-

alty 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. 13 for double suction riser construction.

Table 7A — Refrigerant Piping Requirements, 38AH044-104 Dual-Circuit Units — 50 Hz

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

15-25

(4.6-7.6) 25-50

(7.6-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

LSLSLSLSLSLS

044 Ckt A

⁄

Ckt B

⁄

054 Ckt A

⁄

Ckt B

⁄

*†

064 Ckt A

⁄

†

⁄

†1

⁄

†1

⁄

Ckt B

⁄

074 Ckt A

⁄

†1

⁄

†

Ckt B

⁄

084 Ckt A

⁄

†1

⁄

†1

⁄

†

Ckt B

⁄

094 Ckt A

⁄

** 1

⁄

** 1

⁄

** 1

⁄

Ckt B

⁄

*† 1

⁄

*† 1

⁄

*†

104 Ckt A

⁄

** 1

⁄

** 1

⁄

Ckt B

⁄

LEGEND

L—Liquid Line

S—Suction Line

*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 condens-

ing unit is elevated above evaporator.

NOTES:

1. Addition of 2 unloaders to circuit B compressor is not

recommended.

2. 38AH094 and 38AH104 piping sizes apply only to factory sup-

plied 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) satu-

rated suction temperature (SST). When operating below 40 F

(4.4 C), refer to Carrier System Design Manual, E20-IITpiping de-

sign program, or ASHRAE Handbook to select proper line sizes.

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:

in. 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

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

ABCABCABCABC

054 Ckt A ————————————

Ckt B —————————1

⁄

064 Ckt A 1

⁄

Ckt B ——————1

⁄

074 Ckt A ——————1

⁄

Ckt B ————————————

084 Ckt A ———1

⁄

Ckt B ————————————

094 Ckt A 1

⁄

Ckt B ———1

⁄

104 Ckt A ———1

⁄

Ckt B —————————1

⁄

LEGEND

——Not Required

Pipe A — Suction Riser Without Trap

Pipe B — Suction Riser With Trap

Pipe C — Suction Line to Condensing Unit

NOTES:

1. See Refrigerant Piping Requirements table 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.

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 pen-

alty 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. 13 for double suction riser construction.

Table 8A — Refrigerant Piping Requirements for 38AH044-084

Optional Single-Circuit Units and 38AH124,134

Modular Units (Dual-Circuit) — 60 Hz

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

15-20

(4.6-6.1) 20-50

(6.1-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

LSLSLSLSLSLS

044

⁄

054

⁄

064;

Modules 124A,

124B,134A 1

⁄

†1

⁄

†1

⁄

074;

Module 134B 1

⁄

†1

⁄

†1

⁄

†1

⁄

†1

⁄

084 1

⁄

†1

⁄

†1

⁄

†1

⁄

†1

⁄

†1

⁄

LEGEND

CV — Constant Volume

L—Liquid Line

S—Suction Line

VAV — Variable Air Volume

*Double suction riser required on all units conﬁgurations if condens-

ing unit is elevated above evaporator.

†Double suction riser required on units with factory installed VAV op-

tion or CV units with additional ﬁeld installed unloader on circuit A1

(lead) compressor if condensing unit is elevated above evaporator.

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) satu-

rated suction temperature (SST). When operating below 40 F

(4.4 C), refer to Carrier System Design Manual, E20-IITpiping

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.

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:

in. 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

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT

15-50

(4.6-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

ABCABCABCABCABC

044 ——————1

⁄

054 —————————1

⁄

064

Modules 124A,

124B,134A 1

⁄

074;

Module 134B 1

⁄

084 1

⁄

LEGEND

——Not Required

Pipe A — Suction Riser Without Trap

Pipe B — Suction Riser With Trap

Pipe C — Suction Line to Condensing Unit

NOTES:

1. See Refrigerant Piping Requirements table at top of page to de-

termine 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.

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 pen-

alty 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. 13 for double suction riser construction.

Table 9A — Refrigerant Piping Requirements for 38AH044-084

Optional Single-Circuit Units and 38AH124,134

Modular Units (Dual Circuit) — 50 Hz

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

15-20

(4.6-6.1) 20-50

(6.1-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

LSLSLSL S LSLS

044

⁄

054

⁄

064;

Modules 124A,

124B, 134A

⁄

†1

⁄

†1

⁄

†1

⁄

074;

Module 134B

⁄

†1

⁄

†1

⁄

084 1

⁄

†1

⁄

LEGEND

CV — Constant Volume

L—Liquid Line

S—Suction Line

VAV — Variable Air Volume

*Double suction riser required on all units conﬁgurations if condens-

ing unit is elevated above evaporator.

†Double suction riser required on units with factory installed VAV op-

tion or CV units with additional ﬁeld installed unloader on circuit A1

(lead) compressor if condensing unit is elevated above evaporator.

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) satu-

rated suction temperature (SST). When operating below 40 F

(4.4 C), refer to Carrier System Design Manual, E20-IITpiping

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.

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:

in. 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

UNIT

38AH

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)

15-20

(4.6-6.1) 20-50

(6.1-15.2) 50-75

(15.2-22.9) 75-100

(22.9-30.5) 100-150

(30.5-45.7) 150-200

(45.7-61.0)

ABCABCABCABCABCABC

044 —————————1

⁄

054 ——— — — — 1

⁄

064;

Modules 124A,

124B, 134A ———1

⁄

074;

Module 134B ———1

⁄

084 ———1

⁄

LEGEND

——Not Required

Pipe A — Suction Riser Without Trap

Pipe B — Suction Riser With Trap

Pipe C — Suction Line to Condensing Unit

NOTES:

1. See Refrigerant Piping Requirements table 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.

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 pen-

alty 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. 13 for double suction riser construction.

LEGEND

TXV — Thermostatic Expansion Valve

TYP — Typical

NOTE: Lower split ﬁrst on, last off.

Fig. 14 — 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. 15 — Typical Piping Connections for Face Split Coils for 38AH044-084

Optional Single-Circuit Units

Units 38AH124 and 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 con-

nection 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 124Aor 134A com-

pressor rails. Save the pipe clamps for later use. Cut the

⁄

-in. (67-mm) suction tube into 2 pieces: 28 in. (711 mm)

and 67 in. (1702 mm). Connect the 2 formed 1

⁄

-in.

(29-mm) tubes to the liquid line connection at the liquid valve.

See Fig. 16.

NOTE: Piping kit is designed to allow air handler connec-

tions to project from either side of the service space.

To prepare condensing unit modules for piping connec-

tion, refer to beginning paragraphs of Step 3 — Make

Refrigeration Piping Connections, page 14.

Two 2

⁄

-in. (67-mm) and one 1

⁄

-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. 16. Ensure suction tube

is level for oil return requirements.

Protect liquid valves from the heat of brazing.

Braze the piping connections.

Level the tubes and clamp to the corner posts with factory-

supplied self-drilling screws and pipe clamps removed from

Module 124A or 134A during piping kit removal.

Units 38AH124 and 134 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. 17. 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. 18. 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 cor-

ner post on Module 134A and screws B from top of each

corner post on Module 134B. See Fig. 18. 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 ver-

tical 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, 3 per side.

See Fig. 19.

Connect Tubing from Evaporator to Unit

Protect liquid valves from the heat of brazing.

Braze the liquid and suction lines from the evaporator to

the condensing unit liquid and suction lines. Leak test the

entire system by the pressure method described in the

Carrier Standard Service Techniques Manual, Chapter 1,

Section 1-6. 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). If a leak is detected, evacuate and de-

hydrate the system. Follow methods described in the Carrier

Service Manual, Chapter 1, Section 1-7.

NOTES:

1. Ensure suction tube is level for oil return requirements.

Protect liquid valves from heat of brazing.

Fig. 16 — Units 38AH124 and 134 with Installed

Piping Kit

BASE RAIL

BOLTS (6)

CORNER POST CORNER

POST

Fig. 17 — Units 38AH124 and 134 with Installed Trim

Kit Rails

END COVER

FLANGES

SCREWS B TOP COVER,

VERTICAL

PIECE VERTICAL

TOP COVER

FLANGE

(HIDDEN)

SCREWS A

END COVER

TOP COVER,

HORIZONTAL

PIECE

CORNER

POST MODULE 124B

OR 134B 24-in. (610-mm)

SERVICE WAY CORNER

POST MODULE 124A

OR 134A

Fig. 18 — Units 38AH124 and 134 with Installed Top

Cover (Unit 38AH134 Shown)

MODULE

124B

OR 134B

CORNER

POST (4 PER

MODULE)

SCREWS (2)

FOR

MOUNTING

SIDE PANEL

CORNER

POST

(4 PER

MODULE)

TOP

COVER

FLANGE

MODULE

124A

OR 134A

FACTORY-SUPPLIED

SELF-DRILLING

SCREWS (4 PER

CORNER POST) 24-in. (610-mm)

SERVICE WAY

Fig. 19 — Fully Assembled Piping and Trim Kit

(Unit 38AH134 Shown)

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 or

10B, 11 and 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 ﬁeld-

supplied, 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.

All ﬁeld power enters the unit through a hole in the con-

trol box shelf. Refer to Fig. 20-28 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 con-

nection points, one for each module. Units may use copper,

copper-clad aluminum, or aluminum conductors at all volt-

ages. 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 des-

ignations 500, 600, and 100 in table below where the pri-

mary voltage is ﬁeld voltage. 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.

See Table 13 for control circuit information.

Table 10A — Electrical Data — 50/60 Hz (38AH044-084 Dual-Circuit Units)

STANDARD UNIT COMPRESSOR*

38AH Voltage

Designation

Compressor

A1/B1

Model No.

Nameplate

V-Ph-Hz

Supply Voltage† MCA MOCP ICF A1 B1

Min Max RLA LRA RLA LRA

044

500

06E4250/250

208/230-3-60 187 254 179.4 225 434.7 67.9 345 67.9 345

600 460-3-60 414 508 91.3 100 218.6 34.6 173 34.6 173

100 575-3-60 518 632 78.4 100 162.4 28.8 120 28.8 120

200 380-3-60 342 418 93.5 125 241.2 34.6 191 34.6 191

800 (PW) 230-3-50 198 254 180.2 225 296.7 67.9 207 67.9 207

900 380/415-3-50 342 440 91.5 100 219.6 34.6 173 34.6 173

300 (PW) 346-3-50 325 367 100.0 125 165.9 33.3 115 33.3 115

054

500

06E4250/265

208/230-3-60 187 254 206.6 250 535.7 67.9 345 89.7 446

600 460-3-60 414 508 102.4 125 268.6 34.6 173 43.6 223

100 575-3-60 518 632 88.0 125 206.4 28.8 120 36.5 164

200 380-3-60 342 418 107.1 150 297.2 34.6 191 45.5 247

900 380/415-3-50 342 440 102.7 125 269.6 34.6 173 43.6 223

300 (PW) 346-3-50 325 367 107.0 150 198.9 33.3 115 44.9 148

064

500

06E8265/275

208/230-3-60 187 254 249.3 350 617.5 89.7 446 106.4 506

600 460-3-60 414 508 115.5 150 307.6 43.6 223 46.8 253

100 575-3-60 518 632 100.6 125 226.1 36.5 164 40.4 176

200 380-3-60 342 418 126.9 175 341.1 45.5 247 52.6 280

900 380/415-3-50 342 440 114.1 150 335.6 43.6 223 46.8 280

300 (PW) 346-3-50 325 367 129.8 175 230.5 44.9 148 53.8 168

074

500

06E8275/299

208/230-3-60 187 254 330.5 450 829.0 106.4 506 147.4 690

600 460-3-60 414 508 148.6 200 408.2 46.8 253 65.4 345

100 575-3-60 518 632 132.2 175 336.8 40.4 176 57.1 276

200 380-3-60 342 418 174.5 250 458.0 52.6 280 78.8 382

900 380/415-3-50 342 440 143.0 200 403.8 46.8 280 65.4 345

300 (PW) 346-3-50 325 367 170.8 250 300.4 53.8 168 79.5 229

084

500

06E8299/299

208/230-3-60 187 254 371.5 500 870.0 147.4 690 147.4 690

600 460-3-60 414 508 167.2 225 426.8 65.4 345 65.4 345

100 575-3-60 518 632 148.9 200 353.5 57.1 276 57.1 276

200 380-3-60 342 418 200.7 250 484.2 78.8 382 78.8 382

900 380/415-3-50 342 440 167.6 225 428.4 65.4 345 65.4 345

300 (PW) 346-3-50 325 367 205.3 250 334.9 79.5 229 79.5 229

See page 24 for Legend and Notes.

Table 10B — Electrical Data — 50/60 Hz (38AH044-084 Optional Single-Circuit Units)

OPTIONAL SINGLE-CIRCUIT UNIT COMPRESSOR*

38AH Voltage

Designation

Compressor

A1/A2

Model No.

Nameplate

V-Ph-Hz

Supply Voltage MCA MOCP ICF A1 A2

Min Max RLA LRA RLA LRA

044

500

06E4250/250

208/230-3-60 187 254 179.4 225 434.7 67.9 345 67.9 345

600 460-3-60 414 508 91.3 100 218.6 34.6 173 34.6 173

100 575-3-60 518 632 78.4 100 162.4 28.8 120 28.8 120

200 380-3-60 342 418 93.5 125 241.2 34.6 191 34.6 191

800 (PW) 230-3-50 198 254 180.2 225 296.7 67.9 207 67.9 207

900 380/415-3-50 342 440 91.5 100 219.6 34.6 173 34.6 173

300 (PW) 346-3-50 325 367 100.0 125 165.9 33.3 115 33.3 115

054

500

06E4265/250

208/230-3-60 187 254 206.6 250 535.7 89.7 446 67.9 345

600 460-3-60 414 508 102.4 125 268.6 43.6 223 34.6 173

100 575-3-60 518 632 88.0 125 206.4 36.5 164 28.8 120

200 380-3-60 342 418 107.1 150 297.2 45.5 247 34.6 191

900 380/415-3-50 342 440 102.7 125 269.6 43.6 223 34.6 173

300 (PW) 346-3-50 325 367 107.0 150 198.9 44.9 148 33.3 115

064

500

06E8275/265

208/230-3-60 187 254 249.3 350 617.5 106.4 506 89.7 446

600 460-3-60 414 508 115.5 150 307.6 46.8 253 43.6 223

100 575-3-60 518 632 100.6 125 226.1 40.4 176 36.5 164

200 380-3-60 342 418 126.9 175 341.1 52.6 280 45.5 247

900 380/415-3-50 342 440 115.7 150 335.6 46.8 280 43.6 223

300 (PW) 346-3-50 325 367 129.8 175 230.5 53.8 168 44.9 148

074

500

06E8299/275

208/230-3-60 187 254 330.5 450 829.0 147.4 690 106.4 506

600 460-3-60 414 508 148.6 200 408.2 65.4 345 46.8 253

100 575-3-60 518 632 132.2 175 336.8 57.1 276 40.4 176

200 380-3-60 342 418 174.5 250 458.0 78.8 382 52.6 280

900 380/415-3-50 342 440 143.0 200 403.8 65.4 345 46.8 280

300 (PW) 346-3-50 325 367 170.8 250 300.4 79.5 229 53.8 168

084

500

06E8299/299

208/230-3-60 187 254 371.5 500 870.0 147.4 690 147.4 690

600 460-3-60 414 508 167.2 225 426.8 65.4 345 65.4 345

100 575-3-60 518 632 148.9 200 353.5 57.1 276 57.1 276

200 380-3-60 342 418 200.7 250 484.2 78.8 382 78.8 382

900 380/415-3-50 342 440 167.6 225 428.4 65.4 345 65.4 345

300 (PW) 346-3-50 325 367 205.3 250 334.9 79.5 229 79.5 229

LEGEND

FLA — Full Load Amps

ICF — 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

Max — Maximum

MCA — Minimum Circuit Amps (used for sizing; complies with

National Electrical Code [NEC] [U.S.A. Standard],

section 430-24).

Min — Minimum

MOCP — Maximum Overcurrent Protection (used for sizing dis-

connect; complies with NEC Article 440, Section 22).

RLA — Rated Load Amps

PW — Part Wind Only

*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 sup-

plied to unit terminals is within listed minimum to maximum limits.

NOTES:

1. Maximum allowable phase imbalance: voltage - 2%; amps - 10%.

2. Maximum incoming wire size for terminal block is 500 kcmil.

Table 11 — Electrical Data — 50/60 Hz (Units 38AH094,104)

UNIT

38AH VOLTAGE

DESIGNATION NAMEPLATE

V-Ph-Hz

SUPPLY

VOLTAGE* MCA MOCP ICF

COMPRESSOR†

A1 A2 B1 B2

Min Max RLA LRA RLA LRA RLA LRA RLA LRA

094

500 208/230-3-60 187 253 398.5 500 897 106.4 506 67.9 345 147.7 690 — —

600 460-3-60 414 506 183.1 225 443 46.8 253 34.6 173 65.4 345 — —

100 575-3-60 518 633 160.9 200 366 40.4 176 28.8 120 57.1 276 — —

200 380-3-60 342 418 209.1 250 493 52.6 280 34.6 191 78.8 382 — —

900 380/415-3-50 342 440 183.6 225 444 46.8 280 34.6 173 65.4 345 — —

300 (PW) 346-3-50 325 380 212.9 250 343 53.8 168 33.3 115 79.5 229 — —

104

500 208/230-3-60 187 253 399.4 450 722 89.7 446 67.9 345 89.7 446 89.7 446

600 460-3-60 414 506 196.3 225 361 43.6 223 34.6 173 43.6 223 43.6 223

100 575-3-60 518 633 168.0 200 286 36.5 164 28.8 120 36.5 164 36.5 164

200 380-3-60 342 418 205.9 250 396 45.5 247 34.6 191 45.5 247 45.5 247

900 380/415-3-50 342 440 196.7 225 363 43.6 223 34.6 173 43.6 223 43.6 223

300 (PW) 346-3-50 325 380 205.6 250 298 44.9 148 33.3 229 44.9 148 49.9 148

LEGEND

——Not Applicable

FLA — Full Load Amps

ICF — 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 [U.S.A. Standard],

section 440-22).

RLA — Rated Load Amps

*Units are suitable for use on electrical systems where voltage sup-

plied 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.

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 094 104

CKT A1 A2 B1 A1 A2 B1 B2

MODEL

NO. 06E −275 −250 −299 −265 −250 −265 −265

Table 12 — Electrical Data — 50/60 Hz (Units 38AH124, 134)

UNIT

38AH

MODULE

VOLTAGE

DESIGNATION

COMPRESSOR

A1/A2

MODEL NO.

NAMEPLATE

V-Ph-Hz

SUPPLY

VOLTAGE* MCA MOCP ICF

COMPRESSOR†

A1 A2

Min Max RLA LRA RLA LRA

124A

124B

134A

500

06E8275/

265

208/230-3-60 187 254 249.3 350 617.5 106.4 506 89.7 446

600 460-3-60 414 508 115.5 150 307.6 46.8 253 43.6 223

100 575-3-60 518 632 100.6 125 226.1 40.4 176 36.5 164

200 380-3-60 342 418 126.9 175 341.1 52.6 280 45.5 247

900 380/415-3-50 342 440 115.7 150 335.6 46.8 280 43.6 223

300 (PW) 346-3-50 325 367 129.8 175 230.5 53.8 168 44.9 148

134B

500

06E8299/

275

208/230-3-60 187 254 330.5 450 829.0 147.4 690 106.4 506

600 460-3-60 414 508 148.6 200 408.2 65.4 345 46.8 253

100 575-3-60 518 632 132.2 175 336.8 57.1 276 40.4 176

200 380-3-60 342 418 174.5 250 458.0 78.8 382 52.6 280

900 380/415-3-50 342 440 149.0 200 403.8 65.4 345 46.8 280

300 (PW) 346-3-50 325 367 170.8 250 300.4 79.5 229 53.8 168

LEGEND

FLA — Full Load Amps

ICF — 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 [U.S.A. Standard],

section 440- 22).

PW — Part Wind

RLA — Rated Load Amps

*Units are suitable for use on electrical systems where voltage sup-

plied 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.

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 UNIT POWER CONTROL POWER AMPS

V-Ph-Hz V-Ph-Hz Min Max

−500 208/230-3-60 115-1-60 103 127 4.1

−600 460-3-60 115-1-60 103 127 4.1

−100 575-3-60 115-1-60 103 127 4.1

−200 380-3-60 230-1-60 207 253 2.0

−800 230-3-50 230-1-50 207 253 2.0

−900 380/415-3-50 230-1-50 207 253 2.0

−300 346-3-50 200-1-50 180 220 2.4

NOTE: Units 38AH124 and 134 have 2 control boxes per unit, one in each module.

Table 14 — Fan Motor Electrical Data

UNIT

38AH

CONDENSER FAN

Nameplate

V-Ph-Hz Qty Hp

(kW) Total

kW (No.*) FLA Each (No.*) LRA Each

044

208/230-3-60

(0.746) 6.2

(1,2) 5.5 (3,4) 6.6 (1,2) 30.0 (3,4) 31.6

460-3-60 (1,2) 2.8 (3,4) 3.3 (1,2) 30.0 (3,4) 31.6

575-3-60 (1-4) 3.4 (1-4) 30.0

380-3-60 (1-4) 3.9 (1-4) 20.9

230-3-50 (1,2) 5.5 (3,4) 6.8 (1,2) 30.0 (3,4) 31.6

380/415-3-50 (1-4) 3.4 (1-4) 30.0

346-3-50 (1-4) 4.4 (1-4) 20.9

054

208/230-3-60

(0.746) 6.2

(1,2) 5.5 (3,4) 6.6 (1,2) 30.0 (3,4) 31.6

460-3-60 (1,2) 2.8 (3,4) 3.3 (1,2) 30.0 (3,4) 31.6

575-3-60 (1-4) 3.4 (1-4) 30.0

380-3-60 (1-4) 3.9 (1-4) 20.9

380/415-3-50 (1-4) 3.4 (1-4) 30.0

346-3-50 (1-4) 4.4 (1-4) 20.9

064

208/230-3-60

(0.746) 6.2

(1,2) 5.5 (3,4) 6.6 (1,2) 30.0 (3,4) 31.6

460-3-60 (1,2) 2.8 (3,4) 3.3 (1,2) 30.0 (3,4) 31.6

575-3-60 (1-4) 3.4 (1-4) 30.0

380-3-60 (1-4) 3.9 (1-4) 20.9

380/415-3-50 (1-4) 3.4 (1-4) 30.0

346-3-50 (1-4) 4.4 (1-4) 20.9

074

208/230-3-60

(0.746) 9.3

(1,2) 5.5 (3-6) 6.6 (1,2) 30.0 (3-6) 31.6

460-3-60 (1,2) 2.8 (3-6) 3.3 (1,2) 30.0 (3-6) 31.6

575-3-60 (1-6) 3.4 (1-6) 30.0

380-3-60 (1-6) 3.9 (1-6) 20.9

380/415-3-50 (1-6) 3.4 (1-6) 30.0

346-3-50 (1-6) 4.4 (1-6) 20.9

084

208/230-3-60

(0.746) 9.3

(1,2) 5.5 (3-6) 6.6 (1,2) 30.0 (3-6) 31.6

460-3-60 (1,2) 2.8 (3-6) 3.3 (1,2) 30.0 (3-6) 31.6

575-3-60 (1-6) 3.4 (1-6) 30.0

380-3-60 (1-6) 3.9 (1-6) 20.9

380/415-3-50 (1-6) 3.4 (1-6) 30.0

346-3-50 (1-6) 4.4 (1-6) 20.9

094

208/230-3-60

(0.746) 9.4

(1,2) 5.5 (3-6) 6.6 (1,2) 30.0 (3-6) 31.6

460-3-60 (1-2) 2.8 (3-6) 3.3 (1,2) 30.0 (3-6) 31.6

575-3-60 (1-6) 3.4 (1-6) 30.0

380-3-60 (1-6) 3.9 (1-6) 20.9

380/415-3-50 (1-6) 3.4 (1-6) 30.0

346-3-50 (1-6) 4.4 (1-6) 20.9

104

208/230-3-60

(0.746) 9.5

(1,2) 5.5 (3-6) 6.6 (1,2) 30.0 (3-6) 31.6

460-3-60 (1,2) 2.8 (3-6) 3.3 (1,2) 30.0 (3-6) 31.6

575-3-60 (1-6) 3.4 (1-6) 30.0

380-3-60 (1-6) 3.9 (1-6) 20.9

380/415-3-50 (1-6) 3.4 (1-6) 30.0

346-3-50 (1-6) 4.4 (1-6) 20.9

UNIT 38AH

MODULE

124A

124B

134A

208/230-3-60

(0.746) 6.4

(1,2) 5.5 (3,4) 6.6 (1,2) 30.0 (3,4) 31.6

460-3-60 (1,2) 2.8 (3,4) 3.3 (1,2) 30.0 (3,4) 31.6

575-3-60 (1-4) 3.4 (1-4) 30.0

380-3-60 (1-4) 3.9 (1-4) 20.9

380/415-3-50 (1-4) 3.4 (1-4) 30.0

346-3-50 (1-4) 4.4 (1-4) 20.9

134B

208/230-3-60

(0.746) 9.2

(1,2) 5.5 (3-6) 6.6 (1,2) 30.0 (3-6) 31.6

460-3-60 (1,2) 2.8 (3-6) 3.3 (1,2) 30.0 (3-6) 31.6

575-3-60 (1-6) 3.4 (1-6) 30.0

380-3-60 (1-6) 3.9 (1-6) 20.9

380/415-3-50 (1-6) 3.4 (1-6) 30.0

346-3-50 (1-6) 4.4 (1-6) 20.9

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. 1-6.

NOTE: All fans are protected by a single circuit breaker.

LEGEND

AWG — American Wire Gage

CR — Control Relay

HD — Heating Device

IFC — Indoor-Fan Contactor

IFR — Indoor-Fan Relay

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

R—Heating Relay (ﬁeld-

supplied 24-v sealed coil,

10 va maximum rating)

RV — Reversing Valve

TB — Terminal Block

Factory Wiring

Field Wiring

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

*To control heating device and provide automatic indoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

former power source is used to power the 33CSUCE-06

relay pack.

**Field-supplied.

NOTES:

1. Liquid line solenoid valve LLS-A is used for so-

lenoid drop on circuitA. Liquid line solenoid valve

LLS-B is used for solenoid drop for circuit B.

2. Solenoid drop is a safety feature which pre-

vents refrigerant migration to the compressor dur-

ing the OFF cycle. It is recommended on all

systems and required on systems where piping

exceeds 75 ft (22.9 m) in length.

3. The 33CSUCE-06 relay pack requires 10 va.

4. Factory wiring is in accordance with NEC; ﬁeld

modiﬁcations or additions must be in compli-

ance with all applicable codes.

5. Wiring for ﬁeld power supply must be rated

75 C minimum. Use copper, copper-clad alumi-

num, or aluminum conductors. Maximum in-

coming wire size for each terminal block is

500 kcmil.

6. Terminal blocks TB3 and TB4 are for external

ﬁeld control connections. Control connections

are to be Class 1 wiring.

7. Field-supplied components (IFC, LLS-A, and

LLS-B) must have a maximum sealed coil rat-

ing of 30 va each (0.25 amp at 120 vac and

Fig. 20 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Dual-Circuit Units

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).

8. Replacement of factory wires must be with type

105 C wire or its equivalent.

9. Field-supplied liquid line solenoid valves installed

at the evaporator are required on all units.

10. Units have 175 va of power available for ﬁeld-

installed accessories.

11. To minimize voltage drop, the following wire sizes

are recommended:

LENGTH —

Ft (M) INSULATED WIRE — AWG

(35 C Minimum)

Up to 50

(15.2) No. 18

50-75

(15.2-22.9) No. 16

More Than 75

(22.9) No. 14

LEGEND

AWG — American Wire Gage

CR — Control Relay

HD — Heating Device

IFC — Indoor-Fan Contactor

IFR — Indoor-Fan Relay

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

R—Heating Relay (ﬁeld-

supplied 24-v sealed coil,

10 va maximum rating)

RV — Reversing Valve

TB — Terminal Block

Factory Wiring

Field Wiring

*To control heating device and provide automatic indoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

former power source is used to power the 33CSUCE-06

relay pack.

**Field-supplied.

NOTES:

1. Liquid line solenoid valves LLS-A1 and A2 are used

for solenoid drops.

2. 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.

3. The 33CSUCE-01 relay pack requires 10 va.

4. Factory wiring is in accordance with NEC; ﬁeld modi-

ﬁcations or additions must be in compliance with

all applicable codes.

5. 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.

6. Terminal blocks are for external ﬁeld control con-

nections. Control connections are to be Class 1

wiring.

7. 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

Fig. 21 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Optional Single-Circuit Units

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

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).

8. Replacement of factory wires must be with type

105 C wire or its equivalent.

9. Field-supplied liquid line solenoid valves installed at

the evaporator are required on all units.

10. Units have 175 va of power available for ﬁeld-

installed accessories.

11. To minimize voltage drop, the following wire sizes are

recommended:

LENGTH —

Ft (M) INSULATED WIRE — AWG

(35 C Minimum)

Up to 50

(15.2) No. 18

50-75

(15.2-22.9) No. 16

More Than 75

(22.9) No. 14

LEGEND

AWG — American Wire Gage

CR — Control Relay

HD — Heating Device

IFC — Indoor-Fan Contactor

IFR — Indoor-Fan Relay

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

R—Heating Relay (ﬁeld-

supplied 24-v sealed coil,

10 va maximum rating)

RV — Reversing Valve

TB — Terminal Block

Factory Wiring

Field Wiring

*To control heating device and provide automatic indoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

former power source is used to power the 33CSUCE-06

relay pack.

**Field-supplied.

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

NOTES:

1. 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.

2. Solenoid drop is a safety feature which prevents refrigerant

migration to the compressor during the OFF cycle. It is rec-

ommended on all systems and required on systems where

piping exceeds 75 ft (22.9 m) in length.

3. The 33CSUCE-06 relay pack requires 10 va.

4. Factory wiring is in accordance with NEC; ﬁeld modiﬁcations

or additions must be in compliance with all applicable codes.

5. Wiring for ﬁeld power supply must be rated 75 C mini-

mum. Use copper, copper-clad aluminum, or aluminum con-

ductors. Maximum incoming wire size for each terminal block

is 500 kcmil.

6. Terminal blocks are for external ﬁeld control connections. Con-

trol connections must be Class 1 wiring.

7. 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

(Ea Stage) AMPS VAC

094 275 2.29 120

1.15 240

104 325 2.70 120

1.35 240

8. Replacement of factory wires must be with

type 105 C wire or its equivalent.

9. Field-supplied liquid line solenoid valves in-

stalled at the evaporator are required on all

units.

10. Units 38AH094 has 140 va and unit 38AH104

has 130 va of power available for ﬁeld-

installed accessories.

11. To minimize voltage drop, the following wire

sizes are recommended:

LENGTH —

Ft (M)

INSULATED WIRE —

AWG

(35 C Minimum)

Up to 50

(15.2) No. 18

50-75

(15.2-22.9) No. 16

More Than 75

(22.9) No. 14

Fig. 22 — Field Wiring, One 2-Stage Thermostat — Units 38AH094 and 104

LEGEND

AWG — American Wire Gage

C—Compressor Contactor

CCPS — Capacity Control Pressure

Switch

CR — Control Relay

HD — Heating Device

IFC — Indoor-Fan Contactor

IFR — Indoor-Fan Relay

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

R—Heating Relay (ﬁeld-

supplied 24-v sealed coil,

10 va maximum rating)

RV — Reversing Valve

SDR — Solenoid Drop Relay

TB — Terminal Block

TR — Timer Relay

Factory Wiring

Field Wiring

*Jumper removed only when separate 24-v trans-

former power source is used to power the 33CSUCE-06

relay pack.

†Field-supplied.

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

Fig. 23 — Field Wiring, One 2-Stage Thermostat — Units 38AH124 and 134

NOTES:

1. Liquid line solenoid valves LLS-A1 and A2 are used

for solenoid drop on Module 124A or 134A on cir-

cuit A. Liquid line solenoid valves LLS-B1 and B2

are used for 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 recommended on all systems

and required on systems where piping exceeds

75 ft (22.9 m) in length.

2. Disconnect black wire from CR2 terminal 6; cap loose

end and secure. Connect new ﬁeld-supplied wire

from CR2 terminal 6 to TB3 terminal 1 on module

124B or 134B.

3. The 33CSUCE-06 relay pack requires 10 va.

4. Factory wiring is in accordance with NEC; ﬁeld modi-

ﬁcations or additions must be in compliance with

all applicable codes.

5. 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.

6. Terminal blocks (TB3) are for external ﬁeld control

connections. Control connections must be Class 1

wiring.

7. Field-supplied components (IFC, LLS-A1,A2, and

LLS-B1,B2) 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).

8. Replacement of factory wires must be with type

105 C wire or its equivalent.

9. Field-supplied liquid line solenoid valves installed

at the evaporator are required on all units.

10. Units have 175 va of power available for ﬁeld-

installed accessories.

11. To minimize voltage drop, the following wire sizes

are recommended:

LENGTH —

Ft (M) INSULATED WIRE — AWG

(35 C Minimum)

Up to 50

(15.2) No. 18

50-75

(15.2-22.9) No. 16

More Than 75

(22.9) No. 14

*Field-supplied.

NOTES:

1. Factory wiring is in accordance with NEC; ﬁeld modiﬁcations or addi-

tions must be in compliance with all applicable codes.

2. Wiring for ﬁeld power supply must be rated 75 C minimum. Use cop-

per, copper-clad aluminum, or aluminum conductors. Maximum

incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3 and TB4 are for external ﬁeld control connec-

tions. Control connections are to be Class 1 wiring.

4. Field-supplied components (IFC, LLS-A, and LLS-B) must have a maxi-

mum sealed coil rating of 30 va each (.25 amp at 120 vac, .13 amp at

230 vac). AHMS IFC-AUX must have a 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.

Fig. 24 — Field Wiring, Single ModuPanel™ Control, 38AH044-084 Dual-Circuit Units

LEGEND

AHMS — Air Handler Motor

Starter

AUX — Auxiliary

C—Compressor Contactor

FU — Fuse

GND — Equipment Ground

IFC — Indoor Fan Control

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block

TBX — Terminal Block for Variable

Air Volume Units

TM — Timer Motor

TR — Timer Relay

TRAN — Transformer

U—Unloader Solenoid

Factory Wiring

Field Wiring

*Field-supplied.

NOTES:

1. Factory wiring is in accordance with NEC; ﬁeld modiﬁcations or addi-

tions must be in compliance with all applicable codes.

2. Wiring for ﬁeld power supply must be rated 75 C minimum. Use cop-

per, copper-clad aluminum, or aluminum conductors. Maximum in com-

ing wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3, TBX1, and TBX2 are for external ﬁeld control con-

nections. 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,

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.

Fig. 25 — Field Wiring, Single ModuPanel™ Control, 38AH044-084 Optional Single-Circuit Units

LEGEND

AHMS — Air Handler Motor

Starter

AUX — Auxiliary

C—Compressor Contactor

FU — Fuse

GND — Equipment Ground

IFC — Indoor Fan Control

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block

TBX — Terminal Block for

Variable Air Volume

Units

TM — Timer Motor

TR — Timer Relay

TRAN — Transformer

U—Unloader Solenoid

Factory Wiring

Field Wiring

*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. Maxi-

mum 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 evapo-

rator are required on all units.

7. Control has 25 va of power available for ﬁeld-installed

accessories.

LEGEND

AHMS — Air Handler Motor Starter

AUX — Auxiliary

C—Compressor Contactor

FU — Fuse

GND — Equipment Ground

IFC — Indoor Fan Control

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block

TBX — Terminal Block for Variable

Air Volume Units

TM — Timer Motor

TR — Timer Relay

TRAN — Transformer

U—Unloader Solenoid

Factory Wiring

Field Wiring

Fig. 26 — Field Wiring, Single ModuPanel™ Control, Unit 38AH094

*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. Maxi-

mum 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 evapora-

tor are required on all units.

7. Control has 35 va of power available for ﬁeld-installed accessories.

LEGEND

AHMS — Air Handler Motor Starter

AUX — Auxiliary

C—Compressor Contactor

FU — Fuse

GND — Equipment Ground

IFC — Indoor Fan Control

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block

TBX — Terminal Block for

Variable Air Volume

Units

TM — Timer Motor

TR — Timer Relay

TRAN — Transformer

U—Unloader Solenoid

Factory Wiring

Field Wiring

Fig. 27 — Field Wiring, Single ModuPanel™ Control, Unit 38AH104

*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. Maxi-

mum incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3 and TBX1 are for external ﬁeld control con-

nections. Control connections are to be Class 1 wiring.

4. Field-supplied components (IFC, LLS-A1 and A2) must have a maxi-

mum 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 mini-

mum 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 evapora-

tor are required on all units.

7. Units have 175 va of power available for ﬁeld-installed

accessories.

LEGEND

AHMS — Air Handler Motor Starter

AUX — Auxilliary

C—Compressor Contactor

FU — Fuse

GND — Equipment Ground

IFC — Indoor Fan Control

kcmil — Thousand Circular Mils

LLS — Liquid Line Solenoid

NEC — National Electrical Code

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block

TBX — Terminal Block for Variable

Air Volume Units

TM — Timer Motor

TR — Timer Relay

TRAN — Transformer

U—Unloader Solenoid

Factory Wiring

Field Wiring

Fig. 28 — Field Wiring, Single ModuPanel™ Control, Units 38AH124 and 134

Table 15 — Main Power Connection and Control Circuit Wiring

MAIN POWER CONNECTION CONTROL CIRCUIT

Electrical

Characteristics

(V-Ph-Hz)

Qty

Terminal

Blocks

Qty

Parallel

Conductors*

Max Wire

Size

(kcmil)

Control Power

(V) Safety Circuit

(V)

208/230-3-60 1 6 500 115† 24

460-3-60

575-3-60 1 3 500 115† 24

230-3-50 1 6 500 230 24

380-3-60

380/415-3-50 1 3 500 230 24

346-3-50 1 3 500 200 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.

Step 5 — Install Accessories

LOW-AMBIENT OPERATION

Units 38AH044-084, 124, and 134 — If operating tempera-

tures below 55 F (13 C) are expected, MotormastertIII fan

motor control is recommended. Refer to separate installa-

tion instructions for low-ambient operation guidelines.

Units 38AH094 and 104 — If operating temperatures below

45 F (7 C) are expected, Motormaster III 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 reduc-

tion package, condenser coil protective grilles, compressor

security grilles, ModuPanel™ control, and thermostat trans-

former relay package.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start-

Up, review Start-Up Checklist at the back of this pub-

lication. The Checklist assures proper start-up of a unit

and provides a record of unit condition, application re-

quirements, system information, and operation at ini-

tial start-up.

Do not attempt to start the air-conditioning system until

following checks have been completed.

System Check

1. Check all system components, including the air-

handling equipment. Consult manufacturer’s instruc-

tions. 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 shut-

off valves. Close valves one turn to allow refrigerant pres-

sure to reach the test gages.

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. 29. An acceptable oil level in the compressor

is from

⁄

of sight glass. Adjust the oil level as

required. No oil should be removed unless the crank-

case heater has been energized for at least 24 hours. See

Preliminary Oil Charge section on page 38, for Carrier-

approved oils.

6. Electrical power source must agree with unit

nameplate.

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 heat-

ers must be on for 24 hours prior to the start-up of

any compressor.

7. Crankcase heaters must be ﬁrmly locked into compres-

sors, 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 38AH044-084,

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 com-

pressor rail springs.

10. On 38AH074,084 single-circuit units and Module

38AH134B, ensure that the packaging block located be-

tween the oil equalization tube and the compressor cross-

brace has been removed.

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 de-

mand 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.

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 name-

plate 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 out-

lined in Step 3 — Make Refrigerant Piping Connections,

page 14.

8. If any leaks are detected, evacuate and dehydrate as pre-

viously outlined in Step 3 — Make Refrigerant Piping

Connections, page 14.

Preliminary Oil Charge — Each compressor is fac-

tory charged with oil (see Table 3A, 3B, 4A, or 4B). When

oil is checked at start-up, it may be necessary to add or re-

move 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

jumped.) Wait a few minutes and repeat until pressure re-

mains steady at 2 psig (14 kPa). Remove oil ﬁll plug above

the oil level sight glass, add oil through plug hole, and re-

place plug. Run compressor for 20 minutes and check oil

level.

IMPORTANT: For units with 2 compressors per re-

frigeration circuit, both compressors must be running

to adjust the oil level. Two oil level equalizer lines

between compressors distribute the oil to each

compressor.

DISCHARGE

GAS THERMOSTAT CYLINDER

HEADS OIL PRESSURE SWITCH AND

CAPACITY CONTROL

PRESSURE SWITCH CAPILLARIES MUFFLER

HIGH-

PRESSURE

SWITCH

FAN CYCLING

PRESSURE SWITCH DISCHARGE GAS

THERMOSTAT

MOUNTING

SPRING

(HIDDEN)

SIGHT

GLASS

LOW-

PRESSURE

SWITCH

OIL

EQUALIZER

LINE

CRANKCASE

HEATER

RAIL

SIGHT

GLASS

PRESSURE RELIEF

VALVE

NOTE: Units 38AH044-084 and 38AH124, 134 compressors are pan

mounted. Units 38AH094 and 104 compressors are mounted on rails.

Fig. 29 — 06E Compressors, Typical

NOTE: Use only Carrier approved compressor oil. Ap-

proved sources are: Petroleum Specialties Inc. (Cryol 150A),

Texaco, Inc. (Capella WF-32-150), and Witco Chemical Co.

(Suniso 3GS). 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 kPag). Loosen the

⁄

-in. (6.4-mm) pipe plug at the com-

pressor 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 Train-

ing Air Conditioning), Module 5, Charging, Recovery,

Recycling, and Reclamation for charging procedures. Using

the liquid charging method and charging by weight proce-

dure, charge each circuit with the amount of R-22 listed in

Table 3A, 3B, 4A, or 4B.

Never charge liquid into the low-pressure side of sys-

tem. Do not overcharge. During charging or removal of

refrigerant, be sure indoor-fan system is operating.

Start Unit — The ﬁeld disconnect is closed, the fan cir-

cuit 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 ther-

mostat TC1 must be set to call for cooling at a lower tem-

perature 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 com-

pressor except in an emergency.

38AH044-084 DUAL-CIRCUIT UNITS — Start-up of lead

compressor A1 (Table 16) will be delayed from 12 seconds

to 5

⁄

minutes from the time the call for cooling is initiated

by TC1.After the lead compressor starts, close the TC2 ther-

mostat 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 5

⁄

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 ap-

proximately 2

⁄

minutes after the lead compressor starts if

the suction pressure is above the CCPS set point.

38AH094,104 UNITS — Start-up of lead circuit A,

compressor A1 (Table 16) is delayed from 12 seconds to

⁄

minutes from the time the call for cooling is initiated.

After lead circuit A, compressor A1 starts, close refrig-

eration circuit thermostat TC2 to start lag circuit B, lead

compressor B1. Start-up of compressor B1 is delayed from

12 seconds to 5

⁄

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 compres-

sor suction pressure. The circuit’s lag compressor will start

approximately 2

⁄

minutes after a call for cooling if com-

pressor 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 5

⁄

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 pres-

sure switches (CCPSs) which monitor compressor suction

pressure. The lag compressor starts approximately 2

⁄

min-

utes after the lead compressor starts if the suction pressure

is above the CCPS set point.

After the lead circuit (Module 124A or 134A) lead com-

pressor 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 sec-

onds to 5

⁄

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 suc-

tion pressure. Lag compressor A2 starts approximately 2

⁄

minutes after lead compressor A1 starts if the suction pres-

sure is above the CCPS set point.

Adjust Refrigerant Charge

Never charge liquid into the low-pressure side of sys-

tem. Do not overcharge. During charging or removal of

refrigerant, be sure indoor-fan system is operating.

With all fans operating, and all compressors on the cir-

cuit 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. 30-43. 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 tem-

perature 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 tempera-

ture 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. 11 and 12) is cloudy,

check refrigerant charge again. Ensure all fans and com-

pressors 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.

Table 16 — Index of Lead/Lag Circuits and Compressors

UNIT

38AH 044-084

STD 044-084

OPT 094 104 124 134

LEAD CIRCUIT AAAA

Module

124A Module

134A

Compressor, Lead A1 A1 A1 A1 A1 A1

Compressor; Lag *A2A2A2A2A2

LAG CIRCUIT B†BB

Module

124B Module

134B

Compressor, Lead B1 B1 B1 A1 A1

Compressor; Lag * * B2 A2 A2

LEGEND

OPT — Optional Single-Circuit Units

STD — Standard Dual-Circuit Units

*Circuit has only one compressor.

†Units have only one circuit.

Check Compressor Oil Level — After adjusting the

refrigerant charge, allow each circuit to run fully loaded for

20 minutes. Running oil level should be

⁄

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 for proper procedure for adding and removing oil.

When the above checks are complete, repeat the proce-

dure 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 cir-

cuit 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

stops. The unloader is now at 0 psig (0 kPag) set point. If

electrically actuated unloaders are installed, energize the so-

lenoid to unload the compressor. Recheck the compressor

oil level as described in Check Compressor Oil Level above.

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 un-

loaded. 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 kPag) set point. If electri-

cally actuated unloaders are installed, energize the solenoid

to unload the compressor.

Return unloader to original setting after checks are

complete.

Final Checks — Ensure all safety controls are operat-

ing, control panel covers are on, and the service panels are

in place.

Fig. 30 — Charging Chart — Unit 38AH044; 50/60 Hz — Dual Circuit

Fig. 31 — Charging Chart — Unit 38AH054; 50/60 Hz — Dual Circuit

Fig. 32 — Charging Chart — Unit 38AH064; 50/60 Hz — Dual Circuit

Fig. 33 — Charging Chart — Unit 38AH074; 50/60 Hz — Dual Circuit

Fig. 34 — Charging Chart — Unit 38AH084; 50/60 Hz — Dual Circuit

Fig. 35 — Charging Chart — Unit 38AH044;

50/60 Hz — Optional Single Circuit Fig. 36 — Charging Chart — Unit 38AH054;

50/60 Hz — Optional Single Circuit

Fig. 37 — Charging Chart — Unit 38AH064;

50/60 Hz — Optional Single Circuit Fig. 38 — Charging Chart — Unit 38AH074;

50/60 Hz — Optional Single Circuit

Fig. 39 — Charging Chart — Unit 38AH084;

50/60 Hz — Optional Single Circuit

Fig. 40 — Charging Chart — Unit 38AH094; 50/60 Hz

Fig. 41 — Charging Chart — Unit 38AH104; 50/60 Hz

Fig. 42 — Charging Chart — Modules 124A, 124B,

and 134A; 50/60 Hz Fig. 43 — Charging Chart — Module 134B;

50/60 Hz

SERVICE

ELECTRIC SHOCK HAZARD

Turn off all power to unit before servicing.

The ON-OFF switch on control panel

does not shut off control power; use ﬁeld

disconnect.

Coil Cleaning — Clean the coils with a vacuum cleaner,

compressed air, water, or a non-wire bristle brush.

Refrigerant Circuit

LEAK TESTING — Units are shipped with a holding charge

of R-22 (see Table 3A, 3B, 4A, or 4B) and should be under

sufficient pressure to conduct a leak test. If there is no pres-

sure in the system, introduce enough nitrogen to search

for the leak. Repair the leak using good refrigeration prac-

tices. 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

⁄

-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 liq-

uid and not vapor. Complete charging the unit in accordance

with Start-Up, Adjust Refrigerant Charge, page 39.

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 con-

denser coils at low-ambient temperatures to raise condens-

ing pressure to approximately 280 psig (1931 kPag) 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 low-side service port located above

oil pump crankshaft housing. Charge each circuit until sight

glass shows clear liquid.

Troubleshooting — Refer to Troubleshooting chart lo-

cated at back of book.

Oil Pressure Safety Switch (OPS) — An oil pres-

sure 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 equip-

ment abuse and could affect the warranty.

Compressor Motor Protection

CIRCUIT BREAKER — A manual reset, calibrated trip cir-

cuit breaker for each compressor protects against overcur-

rent. 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.

DISCHARGE GAS THERMOSTAT — A sensor in the

cylinder head of each compressor (Fig. 29) shuts down the

compressor if excessively high discharge gas temperature is

sensed. If the discharge gas thermostat shuts the unit down,

it may be reset by the thermostat or power disconnect switch.

CRANKCASE HEATER (See Fig. 29) — 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 com-

pressor is off. The heater keeps the oil at a temperature that

prevents excessive absorption of refrigerant during shut-

down periods.

Energize the crankcase heaters when the unit is not run-

ning except during prolonged shutdown or servicing. Ener-

gize the heaters at least 24 hours before restarting the unit

after prolonged shutdown.

TIME GUARDtFUNCTION — This function prevents com-

pressors from short-cycling.

Fan Motor Protection — Fan motors are protected

by a single circuit breaker for all motors.

Head Pressure Control — Head pressure control re-

duces condenser capacity under low-ambient conditions. This

is achieved by fan cycling control (standard, all units) and

MotormastertIII control accessory (ﬁeld installed).

FAN CYCLING — All condensing units have standard pro-

vision 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 mod-

ule are cycled by pressure control. On module 134B only,

fans no. 5 and 6 are cycled by an air-temperature switch lo-

cated 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 com-

pressor (see Fig. 29).

The air-temperature switch used to control fans no. 5 and

6 on 38AH074,084 optional single-circuit units and on mod-

ule 134B is closed and cycles the fans on when the ambient-

air temperature is above 70 F (21 C).

Table 17 — Fan Cycling Control — Psig (kPag)

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 (dual-

circuit 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.

38AH044-064,

Modules 124A, 124B,

134A

38AH074-104,

Module 134B

Winter Start Control — A2

⁄

-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 29 shows connection on a cylinder head.

See Table 18 for pressure switch settings.

NOTE: High-pressure switch must be removed from cylin-

der head before removing compressor from the unit.

TO CHECK — Slowly close the discharge shutoff valve un-

til the compressor shuts down. This should be at approxi-

mately 426 psig (2935 kPag). Slowly open the valve. When

the pressure drops to approximately 320 psig (2205 kPag),

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 Guardtcontrols.

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 kPag). Slowly open the valve.

The compressor restarts under Time Guard control when the

pressure builds to approximately 67 psig (462 kPag).

Table 18 — Pressure Switch Settings,

Psig (kPag)

SWITCH CUTOUT CUT-IN

High 426 ± 7 320 ± 20

(2935 ± 48) (2205 ± 138)

Low 27 ± 4 67 ± 7

(186 ± 28) (462 ± 48)

Capacity Control

38AH044-084 DUAL-CIRCUIT UNITS — Capacity con-

trol is achieved by a pressure-actuated cylinder bank un-

loader 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. 44 and Table 19A.) The unloading of the compressor

cylinder bank has no effect on the operation of lag compres-

sor B2, which is controlled by TC2.

38AH044-084 SINGLE-CIRCUIT UNITS AND MOD-

ULES 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 cyl-

inder bank. (See Fig. 44 and Table 19B and 20.) Lag com-

pressorA2 is controlled by ﬁxed setting capacity control pressure

switches (CCPSs) as follows:

CUT-IN —

Psi (kPa) CUTOUT —

Psi (kPa)

CCPS 1 83 (572) 63 (531)

CCPS 2 80 (551) 53 (365)

CCPS — Capacity Control Pressure Switch

If suction pressure continues to drop after lead compres-

sor 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 pressure-

actuated cylinder bank unloader on the lead compressor

(A1, B1) on each of the 2 refrigeration circuits. As the cool-

ing load decreases and the suction pressure drops, the un-

loader actuates at the pre-set suction pressure and unloads

the cylinder bank. (See Fig. 44 and Table 20.) The unloading

of the compressor cylinder bank has no effect on the opera-

tion of the circuit lag compressor (A2, B2 [except 38AH094,

circuit B]) which is controlled by ﬁxed setting capacity con-

trol pressure switches (CCPSs) as follows:

CUT-IN —

Psi (kPa) CUTOUT —

Psi (kPa)

CCPS 1 83 (572) 63 (531)

CCPS 2 80 (551) 53 (365)

CCPS — Capacity Control Pressure Switch

Pressure Relief — High-side pressure relief is pro-

vided by a fusible plug in the liquid line at the service valve.

For low-side 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. 45. The 38AH044-

084 dual-circuit, constant-volume units have a fusible plug

in the suction tubing. A pressure relief valve installed on the

compressor relieves at 450 psig (3102 kPag) (see Fig. 1-6).

Unloader Settings

Unload, psig (kPag) 56 (386)

Load, psig (kPag) 76 (524)

*Unloader location.

Fig. 44 — Unloader Location and Settings

Table 19A — One 2-Stage Thermostat Capacity

Control for 38AH044-084 Dual-Circuit Units

UNIT

38AH

QUANTITY OF LOADED

COMPRESSOR CYLINDERS SYSTEM

CAPACITY

(%)

Circuit

ACircuit

BTotal

044

4 4 8 100

24675

40450

20225

054

4 6 10 100

26879

2 4 6* 59

40442

20221

064

6 6 12 100

4 6 10 84

2 6 8* 68

60648

40432

2 0 2* 16

074

6 6 12 100

4 6 10 86

2 6 8* 72

60643

40429

2 0 2* 15

084

6 6 12 100

4 6 10 83

2 6 8* 66

60650

40433

2 0 2* 17

*Requires units with VAV (variable air volume) factory-supplied

option.

NOTE: Units have 2 independent refrigeration circuits. Circuit Ais lead

circuit.

Table 19B — One 2-Stage Thermostat Capacity

Control for 38AH044-084 Optional Single-Circuit Units

UNIT

38AH QUANTITY OF

LOADED CYLINDERS

SYSTEM

CAPACITY

(%)

044

8 100

675

450

225

054

10 100

881

660

656

437

2* 19*

064

12 100

10 82

864

656

436

2† 18

074

12 100

10 81

862

657

438

2† 19

084

12 100

10 83

866

650

433

2† 17

*Requires accessory unloader on lead 06E-265 compressor (A1).

†Requires VAV (variable air volume) factory-installed option or ac-

cessory unloader.

Table 20 — One 2-Stage Thermostat Capacity

Control for 38AH094-134 Units

UNIT

38AH

QUANTITY OF LOADED

COMPRESSOR CYLINDERS SYSTEM

CAPACITY

(%)

Ckt A Ckt B Total

10 6 16 100

10 4 14 85

10 2 12 70*

10 0 10 55

094 80844

60633

40422

104

10 12 22 100

81220 91

81018 82

10 6 16 73

6 6 12 55

6 4 10 45

06627

40418

04418

2† 0 2 9†

124

12 12 24 100

10 12 22 92

10 10 20 83

8* 10 18 75*

61016 67

6 8* 14 58*

6 6 12 50

4 6 10 42

60625

40417

2* 0 2 8*

134

12 12 24 100

10 12 22 92

10 10 20 83

8* 10 18 75*

61016 67

6 8* 14 58*

6 6 12 50

4 6 10 42

60625

40417

2* 0 2 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 40.

†Requires ﬁeld-installed accessory unloader on circuit lead compres-

sor. Lead compressor is identiﬁed in Table 16, page 40.

NOTES:

1. Temperatures calculated with the minimum number of fans oper-

ating per circuit.

2. See Table 16, page 40, for information on lead and lag circuits.

CONTROL SET POINT — Control set point (cylinder load

point) is adjustable from 0 to 85 psig (0 to 586 kPag).

To adjust the set point, turn the control set point adjust-

ment nut clockwise to bottom stop. (See Fig. 46.) In this

position, load-up set point is 85 psig (586 kPag). Turn

adjustment counterclockwise to desired control set point.

Every full turn clockwise decreases the load-up set point by

7.5 psig (52 kPag).

PRESSURE DIFFERENTIAL — Pressure differential

(difference between cylinder load and unload points) is

adjustable from 6 to 22 psig (41 to 152 kPag). To adjust,

turn pressure differential adjustment screw counterclock-

wise to back stop position. The differential pressure is now

adjusted to 6 psig (41 kPag). Turn the adjustment screw clock-

wise to adjust the differential pressure. Every full clockwise

turn increases the differential by 1.5 psig (10 kPag).

Timer Functions — (See Timer Cycle, Fig. 47.) Each

refrigeration circuit is controlled by an independent timer

which allows for the independent operation of each refrig-

eration circuit.

NOTE: Unit 38AH044-084 optional single-circuit units have

one timer which controls the lead compressor. Lag compres-

sor is controlled by CCPS (capacity control pressure switch).

SWITCH A — The timer is energized through contacts A-A1

or A-A2. This establishes the Time Guardtfunction which

prevents compressor short-cycling. Start of compressor is

delayed approximately 5.5 minutes after shutdown.

SWITCH B — The compressor is initially energized through

contacts B-B1.

SWITCH D — Contacts D-D1 provide a 2

⁄

-minute bypass

of the low-pressure switch at start-up for winter-start con-

trol. On 38AH044-084 optional single-circuit units, contacts

D-D2 control start-up of compressor A2.

SWITCH E — Contacts E-E1 provide a 40-second bypass

of the oil pressure switch at start-up. If oil pressure does not

build to the required minimum pressure in 40 seconds, 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 cool-

ing is made to the circuit. This prevents compressor(s) in

both lead and lag circuits from starting at the same time.

Control Circuit Reset — The control circuit locks out

if the unit shuts down because of low oil pressure, high

discharge gas temperature (DGT), or excessive high-side pres-

sure. 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 low-

pressure switch (LPS) does not close after 2

⁄

minutes, the

unit shuts down. When the pressure builds enough for the

LPS to cut in, the control circuit is energized automatically

and start-up proceeds under Time Guard control.

CONTROL

Sequence of Operation — Units are controlled with

electromechanical components. Each refrigeration circuit

(except 38AH044-084 optional single-circuit units) is oper-

ated 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) open, 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 approxi-

mately 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 cir-

cuit locks out. At start-up, timer contacts D-D1 are closed,

bypassing low-pressure relay contacts LPR-A for 2

⁄

min-

utes. This provides a winter start-up feature.

Approximately 2

⁄

minutes after TC1 closes, timer con-

tacts 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 compres-

sor from restarting for 5 minutes after the demand for cool-

ing is satisﬁed.)

CONDENSER

COIL

FUSIBLE

PLUG

SUCTION

LINE

DISCHARGE

LINE COMPRESSOR RAIL

ACCUMULATOR

Fig. 45 — Accumulator and Fusible Plug

Fig. 46 — Pressure-Actuated Capacity Control Valve

38AH044-084 DUAL-CIRCUIT UNITS; 38AH094,104 —

If circuit A operation is insufficient for the cooling require-

ments, the thermostat second stage TC2 closes to bring cir-

cuit B on-line for cooling. This circuit follows the same se-

quence 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.

38AH044-084 OPTIONALSINGLE-CIRCUIT UNITS: MOD-

ULES 124A, 124B, 134A, AND 134B

NOTE: This sequence of operation assumes that 2 thermo-

stats control units 38AH124 or 134 with one thermostat con-

trolling each module.

If compressor A1 is insufficient for the cooling require-

ments, 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 pres-

sure 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 con-

tinuous (CONT), the IFC is energized as long as the unit

power is on.

Restart After Stoppage by Safety Control — The

high-pressure switch, compressor discharge gas thermostats,

and the oil pressure switch must be reset manually by break-

ing the control power supply at any of the following points:

control circuit fuse, fan motor circuit breaker, or the ther-

mostat. Restart follows the Time Guardtcontrol delay.

Stoppage by low-pressure switch results in Time Guard

control delay, then unit attempts normal restart.

The compressor motor overcurrent protectors are manual-

reset circuit breakers. Reset of control circuit may also be

necessary.

Independent Refrigerant Circuit Controls — Each

refrigeration circuit is controlled by independent circuitry.

Therefore, it is possible to maintain partial cooling capabil-

ity even if one compressor is inoperable.

NOTE: The 38AH044-084 optional single-circuit units do

not have independent control circuitry.

Unit Control Box — (See Fig. 48.) Viewed facing com-

pressors, the control box is at left end of the unit. All in-

coming 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 re-

tainer out horizontally, and engage pin in one of the retainer

ears and the hinge assembly.

Condenser Fans — Each fan is supported by a formed

wire mount bolted to fan deck and covered with a wire guard.

The exposed end of fan motor shaft is protected from weather

by grease. If fan motor must be removed for service or re-

placement, be sure to regrease fan shaft, and reinstall fan

guard. For proper performance, fan should be

⁄

in.

(22 mm) below top of venturi on the fan deck to top of

the fan hub for 60-Hz units, and

⁄

in. (13 mm) for 50-Hz

units. (See Fig. 49.) Tighten set screws to 15 ± 1 ft-lbs

(20 ± 1.3 N-m). Figure 49 shows proper position of mounted

fan.

IMPORTANT: Check for proper fan rotation (clock-

wise viewed from above). If necessary to reverse, switch

leads.

NOTE: Black denotes closed contacts.

Fig. 47 — Timer Cycle

Required Compressor Modiﬁcation for 38AH044-

084 Optional Single-Circuit Units, When Com-

pressor A1 is Out — To maintain unit operation, com-

pressor 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 com-

pressor A1 to compressor A2.

2. Connect compressor A2 into the Time Guardtcircuit as

compressor A1 was originally.

3. Open compressor A1 circuit breaker.

NOTE: Make sure the crankcase heaters are energized when

compressors are off.

FAN CONTACTORS

COMPRESSOR

CIRCUIT

BREAKERS

FAN CIRCUIT

BREAKER

TERMINAL

BLOCKS

TIMERS

TIME-DELAY

RELAY

OIL PRESSURE

SWITCHES FUSE

HOLDERS COMPRESSOR

CONTACTORS

TERMINAL

BLOCKS

TRANSFORMERS

Fig. 48 — Unit Control Box

NOTE: Fan rotation is clockwise when viewed from top of unit.

Fig. 49 — Condenser Fan Adjustment

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 com-

pressor side of the unit.

IMPORTANT:All compressor mounting hardware and

support brackets removed during servicing must be re-

installed 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:

a. Fan-cycling pressure switch (FCPS)

b. High-pressure switch

c. Low-pressure switch

d. Oil-pressure switch

e. 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 mount-

ing 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 com-

pressor rails.

b. Lift compressor off mounting bolts and remove.

Compressor Replacement — Perform the following:

1. Reverse procedure in Compressor Removal section to end

of Step 4.

2. Reinstall service valves and safety switches, and tighten

to torques as listed:

Torque Compressor(s)

Tighten discharge valves to —

20-25 ft-lbs ( 27- 34 N-m) 06E-250

80-90 ft-lbs (109-122 N-m) 06E-265,275,299

Tighten suction valves to —

80- 90 ft-lbs (109-122 N-m) 06E-250

90-120 ft-lbs (122-163 N-m) 06E-265,275,299

Tighten the following ﬁttings as speciﬁed —

60 ft-lbs (81 N-m) Discharge Gas Thermostat

120 in.-lbs (13.5 N-m) High-Pressure Switch, Fan-

Cycling Pressure Switch

120 in.-lbs (13.5 N-m) Low-Pressure Switch

3. Leak-check and evacuate system, reclaim 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

⁄

of sight glass (see Fig. 29,

page 38).

When additional oil or a complete charge is required, use

only Carrier-approved compressor oil.

Approved oils are:

Petroleum Specialties, Inc. — Cryol 150A (factory oil charge)

Texaco, Inc. — Capella WF-32-150

Witco Chemical Co. — Suniso 3GS

COMPRESSOR OIL REQUIRED

Pts L

06E-250 17 8.0

06E-265 21 9.9

06E-275 21 9.9

06E-299 19 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 Start-Up, Preliminary

Oil Charge, page 38.

TROUBLESHOOTING

PROBLEM SOLUTION

COMPRESSOR DOES NOT RUN

Contactor Open

1. Power off. 1. Restore power.

2. Fuses blown in ﬁeld power circuit. 2. After ﬁnding cause and correcting, replace with correct

size fuse.

3. No control power. 3. Check secondary fuse(s); replace with correct type and

size. Replace transformer if primary windings receiving

power.

4. Thermostat circuit open. 4. Check thermostat setting.

5. Multi-function timer not operating. 5. Check timer for proper operation; replace if defective.

6. Compressor circuit breaker tripped. 6. Check for excessive compressor current draw. Reset

breaker; replace if defective.

7. Safety device lockout circuit active. 7. Reset lockout circuit at thermostat or circuit breaker.

8. Low-pressure switch open. 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. High-pressure switch 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. Discharge gas temperature switch open. 10. Check for open condition. Allow for reset. Replace if

defective.

11. Loose electrical connections. 11. Tighten all connections.

12. Compressor stuck. 12. See 06E compressor service literature.

Contactor Closed

1. Compressor leads loose. 1. Check connections.

2. Motor windings open. 2. See 06E compressor service literature.

3. Single phasing. 3. Check for blown fuse. Check for loose connection at

compressor terminal.

COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH

Outdoor Fan On

1. High-pressure switch faulty. 1. Replace switch.

2. Airﬂow restricted. 2. Remove obstruction.

3. Air recirculating. 3. Clear airﬂow area.

4. Noncondensables in system. 4. Purge and recharge as required.

5. Refrigerant overcharge. 5. Purge as required.

6. Line voltage incorrect. 6. Consult power company.

7. Refrigerant system restrictions. 7. Check or replace ﬁlter drier, expansion valve, etc. Check

that compressor discharge valve is fully open.

Outdoor Fan Off

1. Fan slips on shaft. 1. Tighten fan hub setscrews.

2. Motor not running. 2. Check power and capacitor.

3. Motor bearings stuck. 3. Replace bearings.

4. Motor overload open. 4. Check overload rating. Check for fan blade obstruction.

5. Motor burned out. 5. Replace motor.

COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH

Indoor-Air Fan Running

1. Filter drier plugged. 1. Replace ﬁlter drier.

2. Expansion valve power head defective. 2. Replace power head.

3. Low refrigerant charge. 3. Add charge. Check low-pressure switch setting.

Airﬂow Restricted

1. Coil iced up. 1. Check refrigerant charge.

2. Coil dirty. 2. Clean coil ﬁns.

3. Air ﬁlters dirty. 3. Clean or replace ﬁlters.

4. Dampers closed. 4. Check damper operation and position.

Indoor-Air Fan Stopped

1. Electrical connections loose. 1. Tighten all connections.

2. Fan relay defective. 2. Replace relay.

3. Motor overload open. 3. Power supply.

4. Motor defective. 4. Replace motor.

5. Fan belt broken or slipping. 5. Replace or tighten belt.

TROUBLESHOOTING (cont)

PROBLEM SOLUTION

COMPRESSOR STOPS ON OIL PRESSURE SWITCH

1. Oil level too low or too high. 1. Check oil level requirements; adjust oil level until sight

glass is ﬁlled

⁄

when running.

2. Compressor is short cycling. 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. Crankcase heater off. 3. Check relay operation; replace crankcase heater(s), if

defective.

4. Low refrigerant charge. 4. Adjust charge as required.

5. Refrigerant ﬂoodback. 5. Adjust TXV superheat.

6. Evaporator coil is blocked or iced. 6. Check and correct as required.

7. Evaporator fan not operating. 7. Check and correct as required.

8. Distributor and/or TXV too large. 8. Check sizing at design conditions; change if incorrect

for current application.

9. Suction riser too large. 9. Check line sizing at minimum design condition; change

piping if incorrect.

10. Defective oil pressure switch. 10. Check switch for proper operation; check capillary lines

for plugged lines.

11. Plugged oil pump inlet screen. 11. Clean oil pump screen.

12. Faulty oil pump drive segment. 12. Replace drive segment.

13. Worn oil pump. 13. Replace bearing head assembly.

14. Worn compressor bearings. 14. Replace compressor; see 06E service instructions.

COMPRESSOR RUNNING BUT COOLING INSUFFICIENT

Suction Pressure Low

1. Refrigerant charge low. 1. Add refrigerant.

2. Head pressure low. 2. Check refrigerant charge.

Check outdoor-air fan thermostat settings.

3. Air ﬁlters dirty. 3. Clean or replace ﬁlters.

4. Expansion valve power head defective. 4. Replace power head.

5. Indoor coil partially iced. 5. Check low-pressure setting.

6. Indoor airﬂow restricted. 6. Remove obstruction.

Suction Pressure High

1. Unloaders not functioning. 1. Check unloader adjustments.

Check unloader setting.

2. Compressor valve defective. 2. See 06E compressor service literature.

3. Heat load excessive. 3. Check for open doors or windows in vicinity of fan coil.

UNIT OPERATES TOO LONG OR CONTINUOUSLY

1. Low refrigerant charge. 1. Add refrigerant.

2. Control contacts fused. 2. Replace control.

3. Air in system. 3. Purge and evacuate system.

4. Partially plugged expansion valve or ﬁlter drier. 4. Clean or replace.

SYSTEM IS NOISY

1. Piping vibration. 1. Support piping as required.

2. Compressor noisy. 2. Check valve plates for valve noise. Replace compressor

if bearings are worn.

COMPRESSOR LOSES OIL

1. Leak in system. 1. Repair leak.

2. Crankcase heaters not energized during shutdown. 2. Check wiring and relays. Check heater and replace if

defective.

3. Improper interconnecting piping design. 3. Check piping for oil return. Replace if necessary.

FROSTED SUCTION LINE

1. Expansion valve admitting excess refrigerant. 1. Adjust expansion valve.

HOT LIQUID LINE

1. Shortage of refrigerant due to leak. 1. Repair leak and recharge.

2. Expansion valve opens too wide. 2. Adjust expansion valve.

FROSTED LIQUID LINE

1. Restricted ﬁlter drier. 1. Remove restriction or replace.

COMPRESSOR WILL NOT UNLOAD

1. Defective unloader. 1. Replace unloader.

2. Defective capacity control solenoid valve (if used). 2. Replace valve.

3. Miswired capacity control liquid line solenoid (if used). 3. Rewire correctly.

4. Weak, broken, or wrong valve body spring. 4. Replace spring.

COMPRESSOR WILL NOT LOAD

1. Miswired capacity control liquid line solenoid (if used). 1. Rewire correctly.

2. Defective capacity control solenoid valve (if used). 2. Replace valve.

3. Plugged strainer (high side). 3. Clean or replace strainer.

4. Stuck or damaged unloader piston or piston ring(s). 4. Clean or replace the necessary parts.

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 1

Tab 3a

PC 111 Catalog No. 563-704 Printed in U.S.A. Form 38AH-15SI 54 10-98 Replaces: 38AH-14SI

START-UP CHECKLIST

A. Preliminary Information

OUTDOOR: MODEL NO. SERIAL NO.

INDOOR: AIR HANDLER MANUFACTURER

MODEL NO. SERIAL NO.

ADDITIONAL ACCESSORIES

B. 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? (Y/N)

HAS THE GROUND WIRE BEEN CONNECTED? (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? (Y/N)

HAVE CRANKCASE HEATERS BEEN ENERGIZED FOR 24 HOURS? (Y/N)

INDOOR UNIT

HAS WATER BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE? (Y/N)

ARE PROPER AIR FILTERS IN PLACE? (Y/N)

HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT? (Y/N)

DO THE FAN BELTS HAVE PROPER TENSION? (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)? (Y/N)

ARE THE COMPRESSOR OIL SIGHT GLASSES SHOWING ABOUT

⁄

FULL? (Y/N)

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

C. Start-Up

CHECK EVAPORATOR FAN SPEED AND RECORD.

CHECK CONDENSER FAN SPEED AND RECORD.

AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:

COMP A1 COMP A2 COMP B1 COMP B2

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)

CHECK THE COMPRESSOR OIL LEVEL SIGHT GLASSES; ARE THE SIGHT GLASSES SHOWING

OIL LEVEL AT

⁄

FULL? (Y/N)

NOTES:

----------------------------------------------------------------------------------------

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 1

Tab 3a

PC 111 Catalog No. 563-704 Printed in U.S.A. Form 38AH-15SI CL-2 10-98 Replaces: 38AH-14SI

Carrier 38Ah044 084 Users Manual

38AH044-084 to the manual 1ec8522d-b3b8-49ce-b05f-c705fe552dd5

Navigation menu

Versions of this User Manual:

Views

Navigation