Carrier 38AH044, 38AH054, 38AH064, 38AH074, 38AH084 Installation, Start-up And Service Instructions Manual

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Page 1

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 components, and equipment location (roofs, elevated structures, etc.).

Only trained, qualiﬁed installers and service mechanics should install, start up, and service this equipment.

Untrained personnel can perform basic maintenancefunctions, 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 protection to coils. Remove and discard all coil protection after rigging cables are detached.

DOMESTIC UNITS — For units 38AH044-084, 124, and 134; standard unit packaging consists of coilprotection 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. Whileon 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 — RefertoFig.1and 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

Page 2

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 perimeter support channel between the unit and the isolators is recommended. Fasteners for mounting unit are ﬁeld supplied. 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 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.

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 theproperplacement of the unit.

Units 38AH094,104 — For mounting units on vibration isolators, a perimeter support channel is required between the unit and the support isolators. The perimeter support channel must be sizedto support the fully assembled unit. Do not

support units on individual isolationsupports. Support channel, hardware, and fasteners are ﬁeld supplied. When unit is in proper location, level unit and bolt intoposition with ﬁeldsupplied 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 (134Aand 134B). The modules must be connected at the ﬁnal installation site with thefactory-shippedpipingandsheet 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 installation 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 124Aor 134Ain 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 panels 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

Page 3

Remove sheet metal cover panels fromreturn-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 sidesofthe 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 installation 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 isolation supports. Support channel, hardware, and fastenersare 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 mountedon 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 and104 compressors are mounted on rails and held down by rail bolts during shipment. After unit is installed, loosen the rail bolts to allow the rails and compressors to ﬂoat freely on the springs located under the rails. See Fig. 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 untilsnubber 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:Totalweight may differ fromsummationof 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:Totalweight may differ fromsummationof corner weights due

to rounding of numerals.

TOP VIEW, TYPICAL

Page 4

DUAL CKT SINGLE CKT

SUCTION CONNECTION(S)

21⁄89 Dia [54 mm] 25⁄89 Dia [67 mm]

LIQUID CONNECTION(S)

⁄89 Dia [22 mm] 11⁄89 Dia [29 mm]

SUCTION C 28-

⁄169 [627mm] 18-105⁄169 [567mm]

LIQUID D 18-10

⁄169 [561mm] 18-105⁄169 [567mm]

SUCTION (Ckt A) 18-7

⁄169 [503mm] 28-5⁄89 [626mm]

SUCTION (Ckt B) 28-

⁄89 [626mm] —

LIQUID (Ckt A) 28-5

⁄49 [756mm] 28-105⁄89 [879mm]

LIQUID (Ckt B) 28-10

⁄89 [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 mountunit 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

⁄89 (92mm) diameter holeis recommendedfor single-entry poweron size 064(208/230-v) units.

5. See Table1 forrigging center ofgravity (DimensionsX,Y). SeeTable2Aand 2B for A-Dcorner 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

⁄8[92] 1

044, 054

208/230 60 3

⁄8[92] 1

346, 380/415 50 2

⁄2[63] 1

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

⁄2[63] 1

064

208/230 60 2

⁄2[63] 2

346, 380/415 50 3

⁄8[92] 1

LEGEND

C—Copper Fin Coils MTG — Mounting SAE — Society of Automotive Engineers

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

Page 5

DUAL CKT SINGLE CKT

SUCTION CONNECTION(S)

21⁄89 Dia [54 mm] 25⁄89 Dia [67 mm]

LIQUID CONNECTION(S)

⁄89 Dia [22 mm] 11⁄89 Dia [29 mm]

SUCTION C 28-

⁄169 [627mm] 18-105⁄169 [567mm]

LIQUID D 18-10

⁄169 [561mm] 18-105⁄169 [567mm]

SUCTION (Ckt A) 18-7

⁄169 [503mm] 28-5⁄89 [626mm]

SUCTION (Ckt B) 28-

⁄89 [626mm] —

LIQUID (Ckt A) 28-5

⁄49 [756mm] 28-105⁄89 [879mm]

LIQUID (Ckt B) 28-10

⁄89 [879mm] —

Chart 1, Field Power Supply Connections

UNIT VOLTAGE Hz DIAMETER — in. [mm] QTY

074

208/230 60 2

⁄2[63] 2

460 60 2

⁄2[63] 1

074, 084

346, 380/415 50 3

⁄8[92] 1

380 60 3

⁄8[92] 1

575 60 2

⁄2[63] 1

084

208/230 60 3

⁄8[92] 2

460 60 3

⁄8[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 maybe used to mountunit to concrete pad. They are notrecommended for mounting unit to spring isolators. If spring isolators are used, a perimeter support channel between the unit and the isolators 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

Page 6

Chart 1, Field Power Supply Connections

UNIT

38AH

VOLTAGE Hz DIAMETER — in. (mm) QUANTITY

094

208/230 60 3

⁄8(92) 2

460, 575,

380

60 3

⁄8(92) 1

346, 380/415 50 3

⁄8(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

⁄89 (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

Page 7

Chart 1, Field Power Supply Connections

UNIT

38AH

VOLTAGE Hz DIAMETER — in. (mm) QUANTITY

104

208/230 60 3

⁄8(92) 2

460, 575,

380

60 3

⁄8(92) 1

346, 380/415 50 3

⁄8(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

⁄89 (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.

Page 8

Chart 1, Field Power Supply Connections

UNIT

38AH

VOLTAGE Hz

DIAMETER

(in.)

QUANTITY

124A 124B

208/230 60 3

⁄8(92) 1

460, 575,

380

60 2

⁄2(63) 1

346, 380/415 50 3

⁄8(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 usedto mount unit to concrete pad. They are notrecommended for mounting unit to spring isolators.

4. One 3

⁄89 (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 isolatorsare used, a perimeter support channelbetween the unit and the isolators is recommended. Do not support each module separately.

7. Each module ofthe unit must beriggedinto 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

Page 9

Chart 1, Field Power Supply Connections

UNIT

38AH

VOLTAGE Hz

DIAMETER —

in. (mm)

QUANTITY

134A

208/230 60 3

⁄8(92) 1

460, 575, 380 60 2

⁄2(63) 1

346, 380/415 50 3

⁄8(92) 1

134B

208/230 60 2

⁄2(63) 2

460, 575 60 2

⁄2(63) 1

380 60 3

⁄8(92) 1

346, 380/415 50 3

⁄8(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

⁄89 (92-mm) dia hole is recommended for single-entry power into Module 134Aand 208/230-vunits.Single entry powerinto Module 134Bis 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 assembled unitand theisolators isrecommended.Do notsupport eachmodule 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 Table1A or1B for rigging centerof gravity (DimensionsK,L,X,Y). See Table 2A and 2B for A-D corner weights.

Fig. 6 — Dimensions — Unit 38AH134

Page 10

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

⁄8in. (66.7 mm) and liquid ODF is

11⁄8in. (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

Page 11

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

⁄

21⁄

25⁄

Liquid, ODF (in.)

⁄

11⁄

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

⁄

21⁄

25⁄

Liquid, ODF (in.)

⁄

11⁄

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

11⁄

28.6

⁄

54.0

25⁄

66.7

Page 12

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

and Sheet Metal Trim Kit

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)

Page 13

FACTORYINSTALLED 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

38AH094,104

MOUNTING BOLTS RAIL BOLT (3) (2 SHOWN)

RAIL BOLT (3) (2 SHOWN)

MOUNTING BOLTS

Fig. 10 — Outer View, Compressor Mounting

Page 14

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 38AH044084 dual-circuit and 38AH094-134 units), or Fig. 12 (for 38AH044-084 optional single-circuit units).

The units have largesuctionlinestominimizefrictionlosses. The units also have the ability to operate at low capacity. Because of these capabilities, use special care with suction piping and suction risers to ensure proper compressor oil return under all operating conditions. Maximum allowable vertical separation between the condensing unit and the evaporator is shown in Table 5. Size suction lines in accordance with Tables 6A or 6B through 9A or 9B and Fig. 13. Mount liquid line solenoid valve just ahead of the TXVs (thermostatic 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).

T oachievegood mixing of the refrigerant leaving the evaporator suction header for proper sensing by the TXV bulb:

1. Install a minimum of two 90-degree elbows upstream of

the TXV bulb location. See Fig. 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(for38AH044084 optional single-circuit units). When the compressor is below the evaporator, the riser at the evaporator should extend to the top of the evaporator section. After the riser is installed, the suction line can elbow down immediately.

Install a ﬁeld-supplied ﬁlter drier and sight glasses in each refrigerant system. Select the ﬁlter drier for maximum unit

capacity and minimum pressuredrop.Figure1 1(for 38AH044084 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 pressurecaused 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 completion of leak-checking procedure. Repair leak if one is found. When ﬁnished, evacuate and dehydrate system using the methods described in CarrierGTAC 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 cutting 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

Page 15

*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 condensing 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

⁄841 15⁄

41 21⁄

054 15⁄841 15⁄

41 21⁄

064 1

⁄841 21⁄

54 21⁄

074 21⁄854 21⁄

54 21⁄

084 21⁄854 21⁄

54 25⁄8† 67†

094, 104 2

⁄854 21⁄

54 — —

124, 134 25⁄867 25⁄

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

Page 16

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

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

Ckt B

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

054

Ckt A

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

Ckt B

⁄

15⁄

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*

064

Ckt A

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†

Ckt B

⁄

21⁄

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

074

Ckt A

⁄

21⁄

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†

Ckt B

⁄

21⁄

11⁄

21⁄

11⁄

21⁄

11⁄

25⁄

13⁄

25⁄

13⁄

25⁄

084

Ckt A

⁄

21⁄

11⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†13⁄825⁄8†13⁄825⁄8†

Ckt B

⁄

21⁄

11⁄

21⁄

11⁄

21⁄

11⁄

25⁄

13⁄

25⁄

13⁄

25⁄

094

Ckt A

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†13⁄825⁄8†13⁄831⁄8**

Ckt B

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

13⁄

25⁄

104

Ckt A

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†13⁄825⁄8†13⁄831⁄8**

Ckt B

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

13⁄

31⁄8** 13⁄

31⁄8**

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 supplied unit conﬁgurations. They do NOT take into account any ﬁeld installed unloaders.

3. Piping sizes are based on unit operation above 40F(4.4C)saturated suction temperature (SST). When operating below 40 F (4.4 C),referto Carrier System Design Manual,E20-IIT pipingdesign 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 linesizingis based onpressuredrop 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.Seefootnotesand 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

11⁄

28.6

⁄

34.9

15⁄

41.3

⁄

54.0

25⁄

66.7

31⁄

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

⁄82

⁄

064

Ckt A —————————1

⁄82

⁄

Ckt B ————————————

074

Ckt A ——————1

⁄82

⁄81

⁄82

⁄

Ckt B ————————————

084

Ckt A ———1

⁄82

⁄81

⁄82

⁄81

⁄82

⁄

Ckt B ————————————

094

Ckt A 1

⁄

21⁄

25⁄

15⁄

21⁄

25⁄

15⁄

21⁄

25⁄

15⁄

25⁄

31⁄

Ckt B ————————————

104

Ckt A 1

⁄

21⁄

25⁄

13⁄

21⁄

25⁄

13⁄

21⁄

25⁄

15⁄

25⁄

31⁄

Ckt B ——————1

⁄82

⁄83

⁄81

⁄82

⁄83

⁄

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 linesizingis based onpressuredrop equivalent to 2F(1.1 C) at nominalratingconditions. Higher design pressure drop criteriamay allow selection ofsmallerpipe sizes butata penalty of decreased system capacity and efﬁciency.

4. Refer to Carrier System Design Manual or to E20-II design programs for further information on selecting pipe sizes for split systems.

5. All pipe sizes are OD inches. See Table 6A notes for metric equivalents.

6. Refer to Fig. 13 for double suction riser construction.

Page 17

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

⁄

13⁄

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

Ckt B

⁄

13⁄

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

054

Ckt A

⁄

13⁄

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

Ckt B

⁄

15⁄

⁄

15⁄

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*†

064

Ckt A

⁄

15⁄

⁄

15⁄

⁄

21⁄8†

⁄

21⁄8†11⁄821⁄8†11⁄825⁄8**

Ckt B

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

11⁄

25⁄8*1

⁄82

⁄

074

Ckt A

⁄

15⁄

⁄

21⁄

⁄

21⁄

⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†

Ckt B

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

11⁄

25⁄

084

Ckt A

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†11⁄825⁄8†

Ckt B

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

11⁄

25⁄

094

Ckt A

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8** 11⁄

25⁄8** 13⁄

31⁄8**

Ckt B

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*† 11⁄

25⁄8*†

104

Ckt A

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8** 11⁄

25⁄8** 13⁄

31⁄8**

Ckt B

⁄

21⁄

11⁄

21⁄

11⁄

25⁄

11⁄

25⁄

13⁄

25⁄

13⁄

31⁄8**

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 supplied unit conﬁgurations. They do NOT take into account any ﬁeld installed unloaders.

4. Pipe sizes are based on the total linear length shown for each column, plus a 50% allowance for ﬁttings.

6. Double suction risers may be required if condensing unit is elevated above the evaporator.Seefootnotesand 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

11⁄

28.6

⁄

34.9

15⁄

41.3

⁄

54.0

25⁄

66.7

31⁄

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

⁄82

⁄

064

Ckt A 13⁄

15⁄

21⁄

13⁄

15⁄

21⁄

15⁄

21⁄

15⁄

21⁄

25⁄

Ckt B ——————1

⁄82

⁄81

⁄82

⁄

074

Ckt A ——————1

⁄82

⁄81

⁄82

⁄

Ckt B ————————————

084

Ckt A ———1

⁄82

⁄81

⁄82

⁄81

⁄82

⁄

Ckt B ————————————

094

Ckt A 1

⁄

21⁄

25⁄

13⁄

21⁄

25⁄

15⁄

21⁄

25⁄

15⁄

25⁄

31⁄

Ckt B ———1

⁄82

⁄81

⁄82

⁄81

⁄82

⁄

104

Ckt A ———1

⁄82

⁄81

⁄82

⁄81

⁄82

⁄83

⁄

Ckt B —————————1

⁄82

⁄83

⁄

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.

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.

Page 18

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

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*13⁄825⁄

⁄83

⁄

054

⁄

21⁄

11⁄

25⁄

11⁄

25⁄

11⁄

25⁄

13⁄

31⁄8*1

⁄83

⁄

064;

Modules 124A,

124B,134A

⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†13⁄831⁄

*13⁄831⁄

⁄83

⁄

074;

Module 134B

⁄

21⁄

11⁄

25⁄8†13⁄831⁄8†13⁄831⁄

†13⁄831⁄8†1

⁄83

⁄8*

084 1

⁄

25⁄8†11⁄825⁄8†13⁄831⁄8†13⁄831⁄

†15⁄835⁄8†1

⁄83

⁄8*

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-installedunloadersonA2 (lag) compressor isnot recommended.

2. Piping sizes are based on unit operation above 40F(4.4C)saturated suction temperature (SST). When operating below 40 F (4.4 C), refer to Carrier System Design Manual, E20-IIT piping design program,or ASHRAEHandbookto select properlinesizes.

3. Pipe sizes are based on the total linear length shown for each column, plus a 50% allowance for ﬁttings.

4. Suction and liquid linesizingis based onpressuredrop 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.Seefootnotesand 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

11⁄

28.6

⁄

34.9

15⁄

41.3

21⁄

54.0

⁄

66.7

31⁄

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

⁄821⁄825⁄815⁄821⁄825⁄815⁄825⁄831⁄

054 —————————15⁄825⁄831⁄815⁄825⁄831⁄

064

Modules 124A,

124B,134A

⁄

21⁄

25⁄

15⁄

21⁄825⁄

15⁄825⁄831⁄

15⁄

25⁄

31⁄

15⁄

25⁄

31⁄

074;

Module 134B

15⁄

21⁄

25⁄

15⁄

25⁄831⁄

15⁄825⁄831⁄

15⁄

25⁄

31⁄

21⁄

31⁄

35⁄

084 15⁄

21⁄

25⁄

15⁄

25⁄831⁄

15⁄825⁄831⁄

21⁄

31⁄

35⁄

21⁄

31⁄

35⁄

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.

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.

Page 19

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

⁄

21⁄

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*1

⁄82

⁄

⁄82

⁄

054

⁄

21⁄

11⁄

21⁄

11⁄

25⁄8*11⁄825⁄8*1

⁄82

⁄

⁄83

⁄

064;

Modules 124A,

124B, 134A

⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†11⁄825⁄8†1

⁄83

⁄

⁄83

⁄

074;

Module 134B

⁄

21⁄

11⁄

25⁄8†11⁄825⁄8†13⁄831⁄8*1

⁄83

⁄

⁄83

⁄

084 1

⁄

21⁄

11⁄

25⁄8†13⁄831⁄8*13⁄831⁄8*1

⁄83

⁄

⁄83

⁄

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-installedunloadersonA2 (lag) compressor isnot recommended.

3. Pipe sizes are based on the total linear length shown for each column, plus a 50% allowance for ﬁttings.

4. Suction and liquid linesizingis based onpressuredrop 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.Seefootnotesand 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

11⁄

28.6

⁄

34.9

15⁄

41.3

21⁄

54.0

⁄

66.7

31⁄

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

⁄821⁄825⁄815⁄825⁄825⁄815⁄825⁄825⁄

054 ——— — — — 15⁄821⁄825⁄815⁄821⁄825⁄815⁄821⁄825⁄815⁄825⁄831⁄

064;

Modules 124A,

124B, 134A

———15⁄821⁄825⁄815⁄821⁄825⁄815⁄821⁄825⁄815⁄825⁄831⁄815⁄825⁄831⁄

074;

Module 134B

———1

⁄821⁄825⁄815⁄821⁄825⁄815⁄825⁄831⁄815⁄825⁄831⁄815⁄831⁄835⁄

084 ———15⁄821⁄825⁄815⁄825⁄831⁄815⁄825⁄831⁄815⁄825⁄831⁄815⁄831⁄835⁄

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.

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.

Page 20

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

Page 21

Units 38AH124 and 134 Piping Kit Connections — The 38AH124 and 134 units are delivered with a factorysupplied suction and liquid piping kit for installation in the 24-in. (610-mm) service space between the 2 unit modules. The piping kit allows for a common unit side piping connection from the indoor unit to each of the condensing unit refrigeration circuits. Fittings are provided and shipped in the control box.

Remove the copper tubes from Module 124Aor134Acompressor rails. Save the pipe clamps for later use. Cut the 2

⁄8-in. (67-mm) suction tube into 2 pieces: 28 in. (711 mm) and 67 in. (1702 mm). Connect the 2 formed 11⁄8-in. (29-mm) tubes to the liquid line connection at the liquid valve. See Fig. 16.

NOTE: Piping kit is designed to allow air handler connections to project from either side of the service space.

To prepare condensing unit modules for piping connection, refer to beginning paragraphs of Step 3 — Make Refrigeration Piping Connections, page 14.

Two 2

⁄8-in. (67-mm) and one 11⁄8-in. (29-mm) elbows are supplied for piping connections. Fit tubing to ensure proper installation. All tubes should have equal lengths projecting beyond unit corner posts. See Fig. 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 cornerpostswith factorysupplied 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 servicespace. 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 corner 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 screwsAthrough the top cover holes into the endcover. From within the service space, insert supplied screws up through the ﬂange and horizontal cover to make a secure connection between the horizontal and vertical cover pieces.

Insert supplied screws into each of the 2 holes in the vertical side ﬂange of the top cover at each end of the service space.

Attach Side Panels — Insert side panels at the ends of the service space and hook side panel ﬂange over the 2 screws previously inserted in the top cover ﬂange. Fasten panels to the corner posts with supplied self-drilling screws, 3perside. 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 dehydrate 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

Page 22

BASE RAIL BOLTS (6)

CORNER POST

Fig. 17 — Units 38AH124 and 134 withInstalledT rim

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)

Page 23

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 ﬁeldsupplied, branch circuit safety disconnect(s) of a type that can be locked off/open. Disconnects must be located within sight of, and readily accessible from, the unit in compliance with NEC (National Electrical Code) (U.S.A. Standard) Article 440-14.

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 connection points, one for each module. Units may use copper, copper-clad aluminum, or aluminum conductors at all voltages. The maximum wire size units can accept per terminal block is 500 kcmil.

Power must be supplied as shown in Table 15. CONTROL CIRCUIT WIRING — Control circuit wiring is

accomplished with a step-down transformer on voltage designations 500, 600, and 100 in table below where the primary 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.

Page 24

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

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

LEGEND

FLA — Full Load Amps ICF — Maximum Instantaneous Current Flow During Starting.

(The point in the starting sequence where the sum of the LRAforthestartingcompressors,plusthetotalRLA 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.

Page 25

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 LRAforthestartingcompressors,plusthetotalRLA 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 38AH094and104 compressor modelnumbers,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

Page 26

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

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 LRAforthestartingcompressors,plusthetotalRLA 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.

Page 27

Table 14 — Fan Motor Electrical Data

UNIT

38AH

CONDENSER FAN

Nameplate

V-Ph-Hz

Qty

(kW)

Total

(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.

Page 28

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-06relay contacts are ratedfor1 amp/24 vac.

*To control heatingdevice andprovide automaticindoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

formerpowersource isused topower the33CSUCE-06 relay pack.

**Field-supplied.

NOTES:

1. Liquid linesolenoid valve LLS-Aisusedfor solenoiddropon circuitA. Liquidlinesolenoid valve LLS-B is used for solenoid drop for circuit B.

2. Solenoid drop is a safety feature which preventsrefrigerantmigration tothecompressor during the OFF cycle. It is recommended on all systems andrequiredonsystems 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 Cminimum.Usecopper, copper-clad aluminum, or aluminum conductors. Maximum incoming 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 rating 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 ﬁeldinstalled 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

Page 29

LEGEND

(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 heatingdevice andprovide automaticindoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

formerpowersource isused topower the33CSUCE-06 relay pack.

**Field-supplied. NOTES:

1. Liquid linesolenoid valves LLS-A1and A2are 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 wiringis inaccordance 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 minimum. Use copper, copper-clad aluminum, or aluminumconductors.Maximum incomingwire size for each terminal block is 500 kcmil.

6. Terminal blocks are for external ﬁeld control connections. 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 ﬁeldinstalled accessories.

11. Tominimize voltage drop,the following wiresizes 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

Page 30

LEGEND

(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 heatingdevice andprovide automaticindoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

formerpowersource isused topower the33CSUCE-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 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 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. Maximumincomingwire size for eachterminalblock is 500 kcmil.

6. Terminalblocks arefor external ﬁeldcontrol connections.Control 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 120vac and 0.13ampat 230 vac).Thermostats must have a minimum pilot duty rating as follows:

38AH

(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 liquidlinesolenoid valves installed at theevaporatorare required on all units.

10. Units 38AH094has 140va andunit 38AH104 has 130 va of power available for ﬁeldinstalled accessories.

11. Tominimize 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

Page 31

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-

formerpowersource isused topowerthe 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 linesolenoid valves LLS-A1and A2are used for solenoid drop on Module 124A or 134A on circuit A. Liquid line solenoid valves LLS-B1 and B2 areusedfor solenoiddrop forModule124B or134B. 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. Disconnectblackwire fromCR2 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 wiringis inaccordance 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 minimum. Use copper, copper-clad aluminum, or aluminumconductors.Maximum incomingwire size for each terminal block is 500 kcmil.

6. Terminalblocks (TB3) are for external ﬁeld control connections. Control connections must be Class1 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 ﬁeldinstalled 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

Page 32

*Field-supplied. NOTES:

1. Factory wiring is in accordance with NEC; ﬁeld modiﬁcations or additions must be in compliance with all applicable codes.

2. Wiring for ﬁeld power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3 and TB4 are for external ﬁeld control connections. Control connections are to be Class 1 wiring.

4. Field-supplied components (IFC,LLS-A, and LLS-B)must have amaximum sealedcoil rating of30 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 linesolenoid valves installedat theevaporator 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

Page 33

*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, oraluminum conductors. Maximumin coming wire size for each terminal block is 500 kcmil.

3. Terminalblocks TB3,TBX1, and TBX2are for externalﬁeld control connections. Control connections are to be Class 1 wiring.

4. Field-supplied components (IFC, LLS-A1, and LLS-A2) must have a maximum sealed coil rating of 30 va each (0.25 amp at 120 vac, 13 amp at 230 vac). AHMS IFC-AUX must have minimum pilot duty rating of 400va each (3.4amps at120 vac, 1.8amps at 230vac) each.

5. Replacement of factory wires must be with type 105 C wire or its equivalent.

6. Field-supplied liquid linesolenoid valves installedat theevaporator 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

(U.S.A. Standard)

SDR — Solenoid Drop Relay TB — Terminal Block TBX — Terminal Block for

VariableAir Volume Units

TM — Timer Motor TR — Timer Relay TRAN — Transformer U—Unloader Solenoid

Factory Wiring Field Wiring

Page 34

*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 ﬁeldpower supply mustberated 75 Cminimum.Use copper,copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3, TB4, TBX1, and TBX2 are for external ﬁeld control connections. Control connections are to be Class 1 wiring.

4. Field-supplied components(IFC,LLS-A1,A2,B1, andB2)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 linesolenoid valves installedatthe evaporator 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

Page 35

*Field-supplied. NOTES:

1. Factory wiring is in accordance with NEC. Field modiﬁcations or additions must be in compliance with all applicable codes.

2. Wiring for ﬁeld power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3, TB4, TBX1, and TBX2 are for external ﬁeld control connections. Control connections are to be Class 1 wiring.

4. Field-supplied components (IFC, LLS-A1, A2, B1, and B2) must have a maximum sealed coil rating of 30 va each (0.25 amp at 120 vac,0.13amp at 230 vac).AHMS IFC-AUX contactmust have minimum pilot duty rating of 375 va each (3.1 amps at 120 vac,

1.6 amps at 230 vac).

5. Replacement of factory wires must be with type 105 C wire or its equivalent.

6. Field-supplied liquid line solenoid valves installed at the evaporator are required on all units.

7. Control has35va of poweravailable for ﬁeld-installedaccessories.

LEGEND

(U.S.A. Standard)

SDR — Solenoid Drop Relay

TB — Terminal Block TBX — Terminal Block for

VariableAir 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

Page 36

*Field-supplied. NOTES:

1. Factory wiring is in accordance with NEC. Field modiﬁcations or additions must be in compliance with all applicable codes.

2. Wiring for ﬁeld power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is 500 kcmil.

3. Terminal blocks TB3 and TBX1 are for external ﬁeld control connections. Control connections are to be Class 1 wiring.

4. Field-supplied components(IFC, LLS-A1 andA2)musthave amaximum sealed coil rating of 30 va each (0.25 amp at 120 vac,

0.13 amp at 230 vac). AHMS IFC-AUX contact must have minimum pilot duty rating of 400 va each (3.4 amps at 120 vac,

1.8 amps at 230 vac).

5. Replacement of factory wires must be with type 105 C wire or its equivalent.

6. Field-supplied liquid line solenoid valves installed at the evaporator are required on all units.

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

LEGEND

AHMS — 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

Page 37

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, Motormastert III fan motor control is recommended. Refer to separate installation instructions for low-ambient operation guidelines.

Units 38AH094 and 104 — If operating temperatures below 45 F (7 C) are expected, Motormaster 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 reduction package, condenser coil protective grilles, compressor security grilles, ModuPanel™ control, and thermostat transformer relay package.

PRE-START-UP

IMPORTANT:Beforebeginning Pre-Start-Up or StartUp, review Start-Up Checklist at the back of this publication. The Checklist assures proper start-up of aunit and provides a record of unit condition, application requirements, system information, and operation at initial 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 airhandling equipment. Consult manufacturer’s instructions. If the unit has ﬁeld-installed accessories, be sure all are properly installed and wired correctly. Refer to unit wiring diagrams.

2. Backseat (open) compressor suction and discharge shutoffvalves.Closevalvesoneturntoallowrefrigerantpressure 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

⁄8to1⁄3of sight glass. Adjust the oil level as required. No oil should be removed unless the crankcase heater has been energized for at least 24 hours. See Preliminary Oil Charge section on page 38, for Carrierapproved oils.

6. Electrical power source must agree with unit nameplate.

Crankcase heaters on all units are wired into the control circuit, so theyare always operable as long as the main power supply disconnect is on (closed), even if any safety device is open. Compressor heaters must be on for 24 hours prior to the start-up of any compressor.

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 compressor rail springs.

10. On 38AH074,084 single-circuit units and Module 38AH134B, ensure that the packaging block located between the oil equalization tube and the compressor crossbrace has been removed.

Page 38

START-UP

Compressor crankcase heaters must be on for 24 hours before start-up. To energize the crankcase heaters, set the space thermostat above the ambient so there will be no demand for cooling. Close the ﬁeld disconnect and turn on the fan circuit breakers. Leave the compressor circuit breakers off/open. The crankcase heaters are now energized.

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 previously 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 remove oil to bring it to the proper level. One recommended oil level adjustment method is as follows:

ADD OIL — Close suction shutoff valve and pump down crankcase to 2 psig (14 kPa). (Low-pressure cutout must be jumped.) Wait a few minutes and repeat until pressure remains steady at 2 psig (14 kPa). Remove oil ﬁll plug above the oil level sight glass, add oil through plug hole, and replace plug. Run compressor for 20 minutes and check oil level.

IMPORTANT: For units with 2 compressors per refrigeration circuit, both compressors must be running to adjust the oil level. Two oil level equalizer lines between compressors distribute the oil to each compressor.

DISCHARGE GAS THERMOSTAT

CYLINDER HEADS

OIL PRESSURE SWITCH AND CAPACITY CONTROL PRESSURE SWITCH CAPILLARIES

MUFFLER

HIGHPRESSURE SWITCH

FAN CYCLING PRESSURE SWITCH

DISCHARGE GAS THERMOSTAT

MOUNTING SPRING (HIDDEN)

SIGHT GLASS

LOWPRESSURE SWITCH

OIL EQUALIZER LINE

CRANKCASE HEATER

RAIL

SIGHT GLASS

PRESSURE RELIEF VALVE

NOTE: Units 38AH044-084and38AH124,134 compressors are pan mounted. Units38AH094 and 104 compressorsare mounted on rails.

Fig. 29 — 06E Compressors, Typical

Page 39

NOTE: Use only Carrier approved compressor oil. Approved sources are: Petroleum Specialties Inc. (Cryol 150A), Texaco, Inc. (CapellaWF-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 the1⁄4-in. (6.4-mm) pipe plug at the compressor base and allow the oil to seep out past the threads of the plug.

NOTE: The crankcase will be slightly pressurized. Do not remove the plug, or the entire oil charge will be lost.

Small amounts of oil can be removed throughtheoil pump

discharge connection while the compressor is running.

PreliminaryCharge— RefertoGTAC 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 procedure, 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 system. 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 setabove 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 temperature than lag refrigeration circuit thermostat TC2.

See Table 16 for lead/lag circuits on all units. Now set TC2 for cooling.

NOTE: Do not use circuit breakers to start and stop the compressor except in an emergency.

38AH044-084 DUAL-CIRCUIT UNITS — Start-up of lead compressor A1 (Table 16) will be delayed from 12 seconds to 5

⁄2minutes from the time the call for cooling is initiated by TC1.Afterthe lead compressor starts, close the TC2 thermostat to start lag circuit compressor B1. Compressor B1 will start a minimum of 60 seconds after thermostat TC2 is closed.

38AH044-084 OPTIONAL SINGLE CIRCUIT UNITS — Start-up of lead compressor A1 (Table 16) is delayed from 12 seconds to 5

⁄2minutes from the time the call for cooling is initiated by TC1. Closure of TC2 will actuate LLS-A2. Lag compressorA2 is controlled by D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compressor suction pressure. The lag compressor starts approximately 21⁄2minutes 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 51⁄2minutes from the time the call for cooling is initiated. After lead circuit A, compressor A1 starts, close refrigeration circuit thermostat TC2 to start lag circuit B, lead

compressor B1. Start-up of compressor B1 is delayed from 12 seconds to 5

⁄2minutes. (Circuit B of unit 38AH094 has

only one compressor.)

Each circuit’s lead compressor start-up is controlled by the unit control timer. The circuit’s lag compressor start-up is controlled by the D-D2 timer contacts and capacity control pressure switches (CCPSs) which monitor compressor suction pressure. The circuit’s lag compressor will start approximately 2

⁄2minutes 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 51⁄2minutes from the time the call for cooling is initiated by TC1. Lag compressor A2 is controlled by D-D2 timer contacts and capacitycontrol pressure switches (CCPSs) which monitor compressor suction pressure. The lag compressor starts approximately 21⁄2minutes after the lead compressor starts if the suction pressure is above the CCPS set point.

After the lead circuit (Module 124A or 134A) lead compressorA1(Table 16) starts,closetheTC2 thermostat to start the lag circuit (Module 124B or 134B) lead compressor(A1). Lag circuit compressor A1 start-up is delayed from 12 seconds to 5

⁄2minutes from the time the call for cooling is initiated by TC2. Lag compressor A2 is controlled by D-D2 timer contacts and CCPSs which monitor compressor suction pressure. Lag compressor A2 starts approximately 21⁄

minutes after lead compressor A1 starts if the suction pressure is above the CCPS set point.

Adjust Refrigerant Charge

Never charge liquid into the low-pressure side of system. Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating.

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 lineservicevalve,makingsureaSchrader depressor is used if required. Also, measure liquid line temperature as close to the liquid service valve as possible.Add charge until the pressure and temperature conditions of the charging chart curve are met. If liquid pressure and temperature point fall above curve, add charge. If liquid pressure and temperature point fall below curve, reduce the charge until the conditions match the curve.

If the sight glass at location A (Fig. 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.

Page 40

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 be1⁄8to1⁄3up 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 procedure with the unit operating at minimum load conditions.

UNITS 38AH044-084,124, AND 134 — For this minimum load check, run the lead compressor ofeach refrigeration circuit fully unloaded with the lag compressor not operating.

Unload the compressor(s) by turning the control set point adjustment nut counterclockwise until the adjustment nut stops. The unloader is now at 0 psig (0 kPag) set point. If

electrically actuated unloaders are installed, energizethe solenoid to unload the compressor. Recheck the compressor oil level as described inCheck 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 unloaded. See T able16.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 untiltheadjustmentnutstops. The unloader is now at 0 psig (0 kPag) set point. If electrically 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.

Page 41

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

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

Page 42

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

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

Page 43

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

Page 44

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

Page 45

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

Page 46

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.

CoilCleaning — 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 pressure in the system, introduce enough nitrogen to search for the leak. Repair the leak using good refrigeration practices.Afterleaks are repaired, system must be evacuated and dehydrated using methods described inGTAC 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 a1⁄4-in. Schrader connection for charging liquid refrigerant.

Charging with Unit Off and Evacuated — Close liquid line service valve before charging. Weigh in charge shown in Table 3A, 3B, 4A, or 4B. Open liquid line service valve; start unit and allow it to run several minutes fully loaded. Check for a clear sight glass. Be sure clear condition is liquid and not vapor. Complete charging the unit in accordance with Start-Up, Adjust Refrigerant Charge, page 39.

Charging with Unit Running —Ifchargeistobeaddedwhile unit is operating, it is necessary to have all condenser fans and compressors operating. It may be necessary to block condenser coils at low-ambient temperatures to raise condensing pressure to approximately 280 psig (1931 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 toTroubleshooting 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 thatcircuit 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 —Amanual reset, calibrated trip circuit breaker for each compressor protects against overcurrent. Do not bypass connections or increase size of circuit

breakerforany reason.Iftrouble 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 orpower 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 compressor is off. The heater keeps the oil at a temperature that prevents excessive absorption of refrigerant during shutdown periods.

Energize the crankcase heaters when the unit is not running except during prolonged shutdown or servicing. Ener-

gize the heaters at least 24 hours before restarting the unit after prolonged shutdown.

TIME GUARDt FUNCTION —Thisfunctionpreventscompressors 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 Motormastert III control accessory (ﬁeld installed).

FAN CYCLING —All condensing units have standard provision for fully automatic intermediate season head pressure control through fan cycling (see Table 17).

38AH044-084 Dual-Circuit Units — Fans no. 3 and 4 are cycled by pressure control on all units. On 38AH074 and 084, fans no. 5 and 6 are also cycled by pressure control.

38AH044-084 Optional Single Circuit Units — Fans no. 3 and 4 are cycled by pressure control on all units. On 38AH074 and 084, fans no. 5 and 6 are cycled by an air-temperature switch located in the bottom shelf of the control box.

Units 38AH094,104 — Fans no. 3 through 6 are cycled by pressure control.

Units 38AH124,134 — Fans no. 3 and 4 on each unit module are cycled by pressure control. On module 134B only, fans no. 5 and 6 are cycled by an air-temperature switch located in the bottom shelf of the control box.

Pressure control is achievedviaafancyclingpressureswitch located on the cylinder head of the unit or circuit lead compressor (see Fig. 29).

The air-temperature switch used to control fans no. 5 and 6 on 38AH074,084 optional single-circuitunits and on module 134B is closed and cycles the fans on when the ambientair 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: Fansno.1 and 2 arenoncycling.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

Page 47

WinterStartControl— A2

⁄2-minute low-pressure switch (LPS) bypass function in the timer prevents nuisance LPS trips during start-up in low-ambient conditions.

High-Pressure Switch — This switch has nonadjust-

able settings. Figure 29 shows connection on acylinderhead. See Table 18 for pressure switch settings.

NOTE: High-pressure switch must be removed from cylinder head before removing compressor from the unit.

TO CHECK — Slowly close the discharge shutoff valve until the compressor shuts down. This should be at approximately 426 psig (2935 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 Guardt controls.

Low-PressureSwitch— Thelow-pressureswitch(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 control is achieved by a pressure-actuated cylinder bank unloader on lead compressor A1.As the cooling load decreases and the suction pressure drops, the unloader actuates at the pre-set suction pressure and unloads the cylinder bank. (See Fig. 44 and Table 19A.) The unloading of the compressor cylinder bank has no effect on the operation of lag compressor B2, which is controlled by TC2.

38AH044-084 SINGLE-CIRCUIT UNITS AND MODULES 124A, 124B, 134A, AND 134B — Capacity control is achieved by a pressure-actuated cylinder bank unloader on lead compressor A1. See Table 16. As the cooling load decreases and the suction pressure drops, the unloader actuates at the pre-set suction pressure and unloads the cylinder bank. (See Fig. 44 and Table 19B and 20.) Lag compressorA2 is controlled by ﬁxed settingcapacitycontrolpressure 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 compressor A1 unloads and lag compressor A2 is operating, A2 will stop operating when the suction pressure drops to the CCPS cutout point.

38AH094,104 — Capacity control is achieved bya pressureactuated cylinder bank unloader on the lead compressor (A1, B1) on each of the 2 refrigeration circuits.As the cooling load decreases and the suction pressure drops, the unloader actuates at the pre-set suction pressure and unloads the cylinder bank. (See Fig.44 and Table 20.) The unloading of the compressor cylinder bank has no effect on the operation of the circuit lag compressor (A2,B2 [except 38AH094, circuit B]) which is controlled by ﬁxed setting capacity control pressure switches (CCPSs) as follows:

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 except38AH044-084 dualcircuit, constant-volume units). See Fig. 45. The 38AH044084 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

Page 48

Table 19A — One 2-Stage Thermostat Capacity

Control for 38AH044-084 Dual-Circuit Units

UNIT

38AH

QUANTITY OF LOADED

COMPRESSOR CYLINDERS

SYSTEM

CAPACITY

(%)

Circuit

Total

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:Unitshave 2 independentrefrigerationcircuits. CircuitA islead circuit.

Table 19B — One 2-Stage Thermostat Capacity

Controlfor38AH044-084OptionalSingle-CircuitUnits

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*

*RequiresVAV(variableair volume) unitoraccessory unloader(s)field

installed oncircuit lead compressor.Lead compressor is identiﬁedin Table 16, page 40.

†Requires ﬁeld-installedaccessory unloader on circuitleadcompres-

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

NOTES:

1. Temperatures calculated with the minimum number of fans operating 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 adjustment 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 counterclockwise to back stop position. The differential pressure is now adjusted to 6 psig (41 kPag). Turntheadjustmentscrewclockwise to adjust the differential pressure. Every full clockwise turn increases the differential by 1.5 psig (10 kPag).

Page 49

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

refrigeration circuit is controlled by an independent timer which allows for the independent operation of each refrigeration circuit.

NOTE: Unit 38AH044-084 optional single-circuit units have one timer which controls the lead compressor. Lag compressor is controlled by CCPS (capacity controlpressure switch).

SWITCHA— The timer is energized through contacts A-A1 or A-A2. This establishes the Time Guardt function 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

⁄2-minute bypass of the low-pressure switch at start-up for winter-start control. On 38AH044-084 optional single-circuit units, contacts D-D2 control start-up of compressor A2.

SWITCH E — Contacts E-E1 provide a 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 cooling 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 pressure. To reset the control circuit, open and close the fan circuit breaker (FCB). This resets the timer, and the unit restarts under Time Guard control. At start-up, if the lowpressure switch (LPS) does not close after 21⁄2minutes, 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 operated by an independent timer which controls the operation sequence of each circuit.

On a call for cooling, ﬁrst stage cooling thermostat TC1 closes. Condenser fans and timer (TM) are energized. After approximately 7 seconds, timer contacts E-E1 close. Approximately 12 seconds after TC1 closes, normally-open timer contacts B-B1 close for 1 second. This energizes compressor A1 contacts CA1 and starts the compressor. At the same time, solenoid drop relays (SDRs) and liquid line solenoid valve no. 1 (LLS-A for 38AH044-084 dual-circuit units; LLS-A1 for all other units) open, and timer relay no. 1 (TR2) is energized. Normally openTR2contactsclose, completing a circuit around B-B1 and through compressor A1 contactors to maintain compressor operation when B-B1 contacts open. Contacts E-E1 remain closed for approximately 40 seconds to bypass the oil pressure switch (OPS). If oil pressure is insufficient when contacts E-E1 open, the compressor stops, the timer cycles off, and the control circuit locks out. At start-up, timer contacts D-D1 are closed, bypassing low-pressure relay contacts LPR-A for 2

⁄2min-

utes. This provides a winter start-up feature.

Approximately 2

⁄2minutes after TC1 closes, timer contacts D-D1 open and D-D2 close. If pressure is insufficient to close the low-pressure switch, the low-pressure switch relay is open, the compressor shuts down, and the Time Guard control is initiated. (Time Guard control prevents compressor from restarting for 5 minutes after the demand for cooling is satisﬁed.)

CONDENSER COIL

FUSIBLE PLUG

SUCTION LINE

DISCHARGE LINE

COMPRESSOR RAIL

ACCUMULATOR

Fig. 45 — Accumulator and Fusible Plug

Fig. 46 — Pressure-Actuated Capacity Control Valve

Page 50

38AH044-084 DUAL-CIRCUIT UNITS; 38AH094,104 — If circuit A operation is insufficient for the cooling requirements, the thermostat second stage TC2 closes to bring circuit B on-line for cooling. This circuit follows the same sequence of operation as the lead circuit, except a 60-second time delay relay (TDR) delays compressor start-up for 60 seconds after the call for cooling.

38AH044-084 OPTIONALSINGLE-CIRCUIT UNITS: MODULES 124A, 124B, 134A, AND 134B

NOTE: This sequence of operation assumes that 2 thermostats control units 38AH124 or 134with one thermostat controlling each module.

If compressor A1 is insufficient for the cooling requirements, the thermostat second stage closes, which opens the liquid line solenoid valve LLS-A2. CompressorA2starts only after D-D2 contacts in the timer close and the suction pressure is sufficient to close the capacity control switches.

ALL UNITS — When the fan switch is set for automatic (AUTO) operation, the indoor-fan contactor (IFC) is cycled with the lead compressor. If the fan switch is set for continuous (CONT), the IFC is energized as long as the unit power is on.

RestartAfterStoppage by SafetyControl— The

high-pressure switch, compressor discharge gas thermostats, and the oil pressure switch must be reset manually by breaking the control power supply at any of the following points: control circuit fuse, fan motor circuit breaker, or the thermostat. Restart follows the Time Guardt control delay.

Stoppage by low-pressure switch results in Time Guard control delay, then unit attempts normal restart.

The compressor motor overcurrent protectors are manualreset circuit breakers. Reset of control circuit may also be necessary.

IndependentRefrigerant Circuit Controls — Each

refrigeration circuit is controlled by independent circuitry. Therefore, it is possible to maintain partial cooling capability even if one compressor is inoperable.

NOTE: The 38AH044-084 optional single-circuit units do not have independent control circuitry.

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

pressors, the control box is at left end of the unit. All incoming power enters through the control box. The control box contains power components and electronic controls. Outer panels are hingedandlatchedforeasyopening.Removescrews to remove inner panels. Outer panels can be held open for service and inspection by using door retainer on each panel. Remove bottom pin from door retainer assembly, swing retainer out horizontally, and engage pin in one of the retainer ears and the hinge assembly.

Condenser Fans — Each fan is supported by a formed

wire mount bolted to fan deck and coveredwitha wire guard. The exposed end of fan motor shaft is protected fromweather by grease. If fan motor must be removed for service or replacement, be sure to regrease fan shaft, and reinstall fan guard. For proper performance, fan should be7⁄8in. (22 mm) below top of venturi on the fan deck to top of the fan hub for 60-Hz units, and1⁄2in. (13 mm) for 50-Hz units. (See Fig. 49.) Tighten set screws to 15 ± 1 ft-lbs (20 ± 1.3 N-m). Figure 49shows proper position of mounted fan.

IMPORTANT: Check for proper fan rotation (clockwise viewed from above). If necessary to reverse, switch leads.

NOTE: Black denotes closed contacts.

Fig. 47 — Timer Cycle

Page 51

RequiredCompressor Modiﬁcation for 38AH044084 Optional Single-Circuit Units, When CompressorA1 is Out —

To maintain unit operation, compressor no.1 mustbeoperable.Ifitis 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 Guardt circuit 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

Page 52

Compressor Removal — Access to the pump end

of the compressor is from the compressor side of the unit. Access to the motor end of the compressor is from the inside of the unit. All compressors can be removed from the compressor side of the unit.

IMPORTANT:All compressor mounting hardwareand support brackets removed during servicing mustbe reinstalled prior to start-up.

1. Disconnect power to unit; lockout power to compressor.

2. Close suction and discharge service valves.

3. Relieve refrigerant pressure into a refrigerant recovery system.

4. Remove: 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. Remove4largescrewssecuringcompressortothecom-

pressor rails.

b. Lift compressor off mounting bolts and remove.

CompressorReplacement — 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

⁄8to1⁄3of 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(factoryoil 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.

Page 53

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.

Page 54

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

⁄8to1⁄3when 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

Page 55

START-UP CHECKLIST

A. Preliminary Information

OUTDOOR:MODELNO. SERIALNO. 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 ABOUT1⁄2FULL? (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

Page 56

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 AT1⁄8TO1⁄3FULL? (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