Carrier 30Hxa Users Manual

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30HXA,HXC076-186
Water-Cooled and Condenserless Chillers
50/60 Hz

Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
Step 1 — Inspect Shipment . . . . . . . . . . . . . . . . . . . 1
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 1
Step 3 — Piping Connections . . . . . . . . . . . . . . . . . 9
• COOLER FLUID, VENT, AND DRAIN
• BRINE UNITS
• PREPARATION FOR YEAR-ROUND
OPERATION
• 30HXA REFRIGERANT PIPING
• 30HXC CONDENSER CONNECTIONS
• INSTALL PRESSURE RELIEF REFRIGERANT
VENT PIPING
Step 4 — Make Electrical Connections . . . . . . . 14
• FIELD POWER CONNECTIONS
• FIELD CONTROL POWER CONNECTIONS
Step 5 — Install Accessories . . . . . . . . . . . . . . . . 26
• ELECTRICAL
• 30HXA LOW-AMBIENT OPERATION
• MINIMUM LOAD ACCESSORY
• MISCELLANEOUS ACCESSORIES
Step 6 — Leak Test Unit . . . . . . . . . . . . . . . . . . . . . 26
• 30HXC UNITS
• 30HXA UNITS
Step 7 — Refrigerant Charge . . . . . . . . . . . . . . . . 26
• 30HXC UNITS
• 30HXA UNITS

SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can
be hazardous due to system pressures, electrical components, and equipment location. Only trained, qualified
installers and service mechanics should install, start up, and
service this equipment.
When working on the equipment, observe precautions in
the literature, and on tags, stickers, and labels attached to the
equipment.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging, and setting bulky
equipment.

INTRODUCTION
These instructions cover installation of 30HX liquid chillers with electronic controls and units with factory-installed
options (FIOPSs).

IMPORTANT: This equipment generates, uses, and can
radiate radio frequency energy. If not installed and
used in accordance with these instructions, this equipment may cause radio interference. The equipment has
been tested and found to comply with the limits of a
Class A computing device as defined by the FCC
(Federal Communications Commission, U.S.A.) Regulations, Subpart J of Part 15, which are designed to
provide reasonable protection against such interference when operated in a commercial environment.

INSTALLATION
Step 1 — Inspect Shipment — Inspect unit for damage upon arrival. If damage is found, file a claim with the
shipping company right away. Do not store units in an area
exposed to weather because of sensitive control mechanisms and electronic devices.
Locate unit indoors. When considering unit location, consult National Electrical Code (NEC, U.S.A.) and local code
requirements. Allow sufficient space for wiring, piping, and
service. Install unit in an area which will not be exposed to
subfreezing weather. See Fig. 1-4 for clearance details.
Allow the following clearances for service access:
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft (914 mm)
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft (914 mm)
Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ft (610 mm)
Ends . . . . . . . . . . . . . . . tube removal at one (either) end;
3 ft (914 mm) at opposite end.
Be sure surface beneath the unit is level and is capable of
supporting the operating weight of the unit. See Fig. 5 and
Tables 1A and 1B for unit operating weights. If necessary,
add supporting structure (steel beams or reinforced concrete
slabs) to floor to transfer weight to nearest beams.

Step 2 — Rig and Place Unit
Rig unit from the top heat exchanger only. Rigging from
the bottom heat exchanger will cause the unit to be lifted
unsafely. Personal injury or damage to the unit may
occur.
Do not remove unit from skid until unit is in its
final location. Rig from the rigging holes provided in the top
heat exchanger. See Fig. 1-5 for rigging and center of gravity information. Lower the unit carefully onto the floor or
roller. Push or pull only on the skid, not the unit. If the
unit is moved on rollers, use a minimum of 3 evenly-spaced
rollers.
Copy continued on page 9.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2
PC 903
Catalog No. 563-052
Printed in U.S.A.
Form 30HX-1SI
Pg 1
5-96
Replaces: New
Tab 5c

LEGEND
K.O. — Knockout
THK — Thick
TYP — Typical

NOTES:
1.
Denotes center of gravity.
2. Dimensions are in inches. Dimensions ( ) are in millimeters.
3. Recommended service clearance around unit (front, back, and one side) is
369 (914).

DIMENSIONS — in. (mm)
UNIT
30HXC
076
086
096
106
116
126
136
146

A

B

C

D

E

F

G

H

J

K

L

M

N

P

102.12
(2594)
102.12
(2594)
102.12
(2594)
102.12
(2594)
132.56
(3367)
132.56
(3367)
132.56
(3367)
132.56
(3367)

45.87
(1165)
45.87
(1165)
37.63
(956)
37.63
(956)
72.12
(1832)
72.12
(1832)
72.12
(1832)
72.12
(1832)

45.87
(1165)
45.87
(1165)
54.12
(1375)
54.12
(1375)
50.63
(1286)
50.63
(1286)
50.63
(1286)
50.63
(1286)

9.87
(251)
9.87
(251)
9.87
(251)
10.47
(266)
9.87
(251)
9.87
(251)
9.87
(251)
9.87
(251)

9.36
(236)
9.36
(236)
9.36
(236)
10.28
(261)
9.36
(236)
9.36
(236)
9.36
(236)
9.36
(236)

43.50
(1105)
43.50
(1105)
43.50
(1105)
45.50
(1156)
43.50
(1105)
43.50
(1105)
43.50
(1105)
43.50
(1105)

15.60
(396)
15.60
(396)
15.60
(396)
15.60
(396)
31.11
(790)
31.11
(790)
31.11
(790)
31.11
(790)

85.15
(2163)
85.15
(2163)
85.15
(2163)
85.15
(2163)
100.66
(2557)
100.66
(2557)
100.66
(2557)
100.66
(2557)

4.00
(102)
4.00
(102)
4.00
(102)
5.00
(127)
4.00
(102)
4.00
(102)
4.00
(102)
4.00
(102)

95.00
(2413)
95.00
(2413)
95.00
(2413)
95.00
(2413)
126.00
(3200)
126.00
(3200)
126.00
(3200)
126.00
(3200)

65.22
(1657)
65.22
(1657)
65.22
(1657)
67.22
(1707)
65.22
(1657)
65.22
(1657)
65.22
(1657)
65.22
(1657)

1.90
(48)
1.90
(48)
1.90
(48)
1.90
(48)
1.70
(43)
1.70
(43)
1.70
(43)
1.70
(43)

47.00
(1194)
47.00
(1194)
47.00
(1194)
47.00
(1194)
62.20
(1580)
62.20
(1580)
62.20
(1580)
62.20
(1580)

30.80
(782)
30.80
(782)
30.80
(782)
30.80
(782)
29.40
(747)
29.40
(747)
29.40
(747)
29.40
(747)

Fig. 1 — Base Unit Dimensions, 30HXC076-146 Units
2

DIMENSIONS — in. (mm)

NOTES:

UNIT
30HXC

A

B

C

D

E

161

72.12
(1832)
61.37
(1559)
61.37
(1559)

50.63
(1286)
61.37
(1559)
61.37
(1559)

2.00
(51)
2.00
(51)
2.00
(51)

63.50
(1588)
63.50
(1588)
63.50
(1588)

31.00
(787)
31.00
(787)
31.00
(787)

171
186

1.
Denotes center of gravity.
2. Dimensions are in inches. Dimensions ( ) are in millimeters.
3. Recommended service clearance around unit (front, back, and one side) is
369 (914).
LEGEND
K.O. — Knockout
THK — Thick
TYP — Typical

Fig. 2 — Base Unit Dimensions, 30HXC161-186 Units

3

LEGEND
K.O. — Knockout
SAE — Society of Automotive
Engineers, U.S.A.
THK — Thick
TYP — Typical

NOTES:
1.
Denotes center of gravity.
2. Dimensions are in inches. Dimensions ( ) are in millimeters.
3. Recommended service clearance around unit (front, back, and one side) is
369 (914).

DIMENSIONS — in. (mm)
UNIT
30HXA
076
086
096
106
116
126
136
146

A

B

C

D

E

F

G

H

J

K

L

M

102.12
(2594)
102.12
(2594)
102.12
(2594)
102.12
(2594)
132.56
(3367)
132.56
(3367)
132.56
(3367)
132.56
(3367)

45.87
(1165)
45.87
(1165)
37.63
(956)
37.63
(956)
72.12
(1832)
72.12
(1832)
72.12
(1832)
72.12
(1832)

45.87
(1165)
45.87
(1165)
54.12
(1375)
54.12
(1375)
50.63
(1286)
50.63
(1286)
50.63
(1286)
50.63
(1286)

27.81
(706)
27.81
(706)
27.81
(706)
28.41
(721)
27.81
(706)
27.81
(706)
27.81
(706)
27.81
(706)

9.36
(236)
9.36
(236)
9.36
(236)
10.28
(261)
9.36
(236)
9.36
(236)
9.36
(236)
9.36
(236)

43.50
(1105)
43.50
(1105)
43.50
(1105)
45.50
(1156)
43.50
(1105)
43.50
(1105)
43.50
(1105)
43.50
(1105)

15.60
(396)
15.60
(396)
15.60
(396)
15.60
(396)
31.11
(790)
31.11
(790)
31.11
(790)
31.11
(790)

85.15
(2163)
85.15
(2163)
85.15
(2163)
85.15
(2163)
100.66
(2557)
100.66
(2557)
100.66
(2557)
100.66
(2557)

4.00
(102)
4.00
(102)
4.00
(102)
5.00
(127)
4.00
(102)
4.00
(102)
4.00
(102)
4.00
(102)

95.00
(2413)
95.00
(2413)
95.00
(2413)
95.00
(2413)
126.00
(3200)
126.00
(3200)
126.00
(3200)
126.00
(3200)

65.22
(1657)
65.22
(1657)
65.22
(1657)
67.22
(1707)
65.22
(1657)
65.22
(1657)
65.22
(1657)
65.22
(1657)

13.93
(354)
13.93
(354)
22.15
(563)
22.15
(563)
40.16
(1020)
40.16
(1020)
40.16
(1020)
40.16
(1020)

N

P

59.48 5.72
(1511) (145 )
59.48 5.72
(1511) (145)
42.77 5.72
(1086) (145)
42.77 5.87
(1086) (149)
64.23 5.72
(1631) (145)
64.23 5.72
(1631) (145)
64.23 5.72
(1631) (145)
64.23 5.72
(1631) (145)

Fig. 3 — Base Unit Dimensions, 30HXA076-146 Units
4

R

S

T

U

V

45.81
(1164)
45.81
(1164)
54.06
(1373)
54.06
(1373)
72.06
(1830)
72.06
(1830)
72.06
(1830)
72.06
(1830)

46.25
(1175)
46.25
(1175)
38.00
(965)
38.00
(965)
51.01
(1296)
51.01
(1296)
51.01
(1296)
51.01
(1296)

2.40
(61)
2.40
(61)
2.40
(61)
2.40
(61)
2.30
(58)
2.30
(58)
2.30
(58)
2.30
(58)

46.40
(1179)
46.40
(1179)
46.40
(1179)
46.40
(1179)
61.00
(1549)
61.00
(1549)
61.00
(1549)
61.00
(1549)

35.00
(889)
35.00
(889)
35.00
(889)
35.00
(889)
34.30
(871)
34.30
(871)
34.30
(871)
34.30
(871)

LEGEND
K.O. — Knockout
SAE — Society of Automotive
Engineers, U.S.A.
THK — Thick
TYP — Typical

NOTES:
1.
Denotes center of gravity.
2. Dimensions are in inches. Dimensions ( ) are in millimeters.
3. Recommended service clearance around unit (front, back, and one side) is
369 (914).

DIMENSIONS — in. (mm)
UNIT
30HXA

A

B

C

D

E

F

G

H

J

161

72.12
(1832)
61.37
(1559)
61.37
(1559)

50.63
(1386)
61.37
(1559)
61.37
(1559)

48.56
(1233)
43.25
(1099)
43.25
(1099)

46.62
(1184)
46.62
(1184)
46.62
(1184)

72.06
(1830)
61.31
(1572)
61.31
(1572)

51.00
(1295)
61.75
(1568)
61.75
(1568)

2.70
(69)
2.70
(69)
2.70
(69)

62.50
(1588)
62.50
(1588)
62.50
(1588)

35.20
(894)
35.20
(894)
35.20
(894)

171
186

Fig. 4 — Base Unit Dimensions, 30HXA161-186 Units
5

WEIGHT DISTRIBUTION AT EACH MOUNTING PLATE,
30HXC UNITS — Lb (Kg)
UNIT
30HXC
076
086
096
106
116
126
136
146
161
171
186

1
738
(335)
738
(335)
686
(311)
730
(331)
728
(330)
738
(335)
758
(344)
763
(346)
817
(371)
936
(425)
962
(436)

MOUNTING
2
3
943
595
(428)
(270)
947
597
(430)
(271)
968
693
(439)
(314)
1028
744
(466)
(337)
1114
777
(505)
(352)
1127
780
(511)
(354)
1176
811
(533)
(368)
1182
815
(536)
(370)
1272
908
(577)
(412)
1318
840
(598)
(381)
1361
860
(617)
(390)

PLATE NO.
4
5
1110
1418
(503)
(643)
1112
1427
(504)
(647)
1027
1447
(466)
(656)
1073
1510
(487)
(685)
1053
1615
(478)
(733)
1061
1628
(481)
(738)
1083
1689
(491)
(766)
1085
1697
(492)
(770)
1219
1890
(553)
(857)
1379
1946
(626)
(883)
1410
1996
(640)
(905)

WEIGHT DISTRIBUTION AT EACH MOUNTING PLATE,
30HXA UNITS — Lb (Kg)
UNIT
30HXA

6
896
(406)
902
(409)
1034
(469)
1092
(495)
1127
(511)
1131
(513)
1171
(531)
1172
(532)
1346
(610)
1241
(563)
1265
(574)

076
086
096
106
116
126
136
146
161
171
186

1
555
(252)
555
(252)
509
(231)
555
(252)
530
(240)
540
(245)
548
(249)
551
(250)
560
(254)
627
(284)
648
(294)

NOTE: See Fig. 1-4 for center of gravity details.

Fig. 5 — Rigging Information

6

MOUNTING
2
3
793
418
(360)
(190)
798
418
(362)
(190)
808
493
(367)
(224)
869
541
(394)
(245)
895
540
(406)
(245)
905
541
(410)
(245)
926
555
(420)
(252)
930
555
(422)
(252)
965
598
(438)
(271)
968
534
(439)
(242)
1004
552
(455)
(250)

PLATE NO.
4
5
926
1326
(420)
(601)
928
1340
(421)
(608)
848
1350
(385)
(612)
896
1410
(406)
(640)
855
1456
(388)
(660)
864
1468
(392)
(666)
8743
1498
(396)
(679)
883
1506
(400)
(683)
954
1650
(433)
(748)
1072
1658
(486)
(752)
1110
1703
(504)
(772)

6
699
(317)
705
(320)
827
(375)
880
(399)
887
(402)
887
(402)
908
(412)
908
(412)
1025
(465)
918
(416)
939
(426)

Table 1A — Physical Data, English
UNIT SIZE
UNIT WEIGHT (lb)
Fluid Cooled (HXC)
Condenserless (HXA)
COMPRESSORS
Quantity
Nominal Capacity per
Compressor (tons)
Economizer
No. Capacity Steps
Standard
Optional (maximum)
Minimum Step Capacity (%)
Standard
Optional
REFRIGERANT TYPE
Charge* (lb)
Circuit A/Circuit B
COOLER TYPE
Part No. 10HX400−
Net Fluid Volume (gal)
Maximum Refrigerant Pressure
(psig)
Maximum Fluid-Side Pressure
(psig)
Fluid Connections (in.)
Inlet and Outlet
Drain (NPT)
30HXA OIL SEPARATOR
Part No. 09RX400−
Maximum Refrigerant Pressure
(psig)
Refrigerant Connections (in.)
Discharge
Liquid
CONDENSER (HXC)
Part No. 09RX400−
Net Fluid Volume (gal)
Maximum Refrigerant Pressure
(psig)
Maximum Water-Side Pressure
(psig)
Water Connections (in.)
Inlet and Outlet
Drain (NPT)

076

086

096

106

5700
4717

5723
4744

5855
4835

6177
5151

116

126

136

146

161

171

186

6415
6465
6688
6718
5162
5205
5308
5333
Semi-Hermetic, Twin Screw
2
2
2
2

7452
5752

7660
5777

7854
5946

2

2

2

2

2

2

2

39/39
No

46/39
No

56/39
No

66/39
No

66/46
No

66/56
No

80/56
No

80/66
No

80/56
Yes

66/80
Yes

80/80
Yes

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

20
10

20
10

20
10

20
10

20
10

20
20
10
10
R-134a

20
10

20
10

20
10

20
10

55/55

66/55

79/55

95/55

95/66

114/95

130/90

109/130

130/130

012
28.5

013
33.4

95/79

114/79

001
17.0

001
17.0

002
19.0

Shell and Tube with Enhanced Copper Tubes
010
007
007
006
006
104
22.6
21.4
21.4
24.0
24.0
28.5

220

220

220

220

220

300

300

300

300

300

12

4
⁄

12

4
⁄

12

4
⁄

12

007
320

007
320

008
320

008
320

21⁄8
11⁄8

2 1 ⁄8
1 1 ⁄8

21⁄8
11⁄8

001
16.8
220

001
16.8
220

002
18.3
220

2 1 ⁄8
21⁄8
1 1 ⁄8
11⁄8
Shell and Tube
002
003
18.3
23.9
220
220

300

300

300

300

5
⁄

12

5
⁄

12

5
⁄

12

12

5
⁄

5
⁄

220

220

220

220

220

300

300

300

300

12

4
⁄

12

5
⁄

12

5
⁄

12

009
320

009
320

010
320

010
320

2 1 ⁄8
21⁄8
21⁄8
21⁄8
1 1 ⁄8
11⁄8
11⁄8
13⁄8
with Enhanced Copper Tubes
003
004
004
005
23.9
27.5
27.5
30.6
220
220
220
220

21⁄8
13⁄8

21⁄8
13⁄8

006
37.6
220

006
37.6
220

300
300
Steel Weld Couplings
4
4
4
1⁄2
1⁄2
1 ⁄2

009
320

009
320

300

009
320

300
300
Steel Weld Couplings
5
5
5
1⁄2
1⁄2
1 ⁄2

*Charges listed are for 30HXC units. The 30HXA units are shipped with a holding charge only.

7

220

5
⁄

300

300

300

300

5
⁄

12

5
⁄

12

5
⁄

12

12

5
⁄

Table 1B — Physical Data, SI
UNIT SIZE
UNIT WEIGHT (Kg)
Fluid Cooled (HXC)
Condenserless (HXA)
COMPRESSORS
Quantity
Nominal Capacity per
Compressor (kW)
Economizer
No. Capacity Steps
Standard
Optional (maximum)
Minimum Step Capacity (%)
Standard
Optional
REFRIGERANT TYPE
Charge* (Kg)
Circuit A/Circuit B
COOLER TYPE
Part No. 10HX400−
Net Fluid Volume (L)
Maximum Refrigerant
Pressure (kPa)
Maximum Fluid-Side
Pressure (kPa)
Fluid Connections (in.)
Inlet and Outlet
Drain (NPT)
30HXA OIL SEPARATOR
Part No. 09RX400−
Maximum Refrigerant
Pressure (kPa)
Refrigerant Connections (in.)
Discharge
Liquid
CONDENSER (HXC)
Part No. 09RX400−
Net Fluid Volume (L)
Maximum Refrigerant
Pressure (kPa)
Maximum Water-Side
Pressure (kPa)
Water Connections (in.)
Inlet and Outlet
Drain (NPT)

076

086

096

106

2586
2140

2596
2152

2656
2193

2802
2336

2

2

2

2

116

126

136

2910
2933
3034
2341
2361
2408
Semi-Hermetic, Twin Screw
2
2
2

146

161

171

186

3047
2419

3380
2609

3476
2620

3563
2697

2

2

2

2

137/137 162/137 197/137 232/137 232/137 232/197 281/197 281/232 281/197 232/281 281/281
No
No
No
No
No
No
No
No
Yes
Yes
Yes
6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

6
8

20
10

20
10

20
10

20
10

20
10

20
10
R-134a

20
10

20
10

20
10

20
10

20
10

24.9/
24.9

29.9/
24.9

35.8/
24.9

001
64.3
1517

001
64.3
1517

2068

12

4
⁄

43.1/
43.1/
51.7/
29.9
35.8
35.8
Tube with Enhanced Copper
007
007
006
81.0
81.0
90.8
1517
1517
1517

51.7/
43.1
Tubes
006
90.8
1517

59.0/
40.8

49.4/
59.0

59.0/
59.0

002
71.9
1517

43.1/
24.9
Shell and
010
85.5
1517

104
107.9
1517

012
107.9
1517

013
126.4
1517

2068

2068

2068

2068

2068

2068

2068

12

4
⁄

12

4
⁄

12

2068
2068
2068
Steel Weld Couplings
4
4
4
1⁄2
1⁄2
1⁄2

12

4
⁄

12

5
⁄

12

5
⁄

12

007
2205

007
2205

008
2205

008
2205

009
2205

009
2205

009
2205

010
2205

010
2205

21⁄8
11⁄8

2 1 ⁄8
1 1 ⁄8

21⁄8
11⁄8

2 1 ⁄8
1 3 ⁄8

002
69.3
1517

2 1 ⁄8
1 1 ⁄8
Tubes
004
104.1
1517

21⁄8
13⁄8

001
63.6
1517

2 1 ⁄8
21⁄8
21⁄8
1 1 ⁄8
11⁄8
11⁄8
Tube with Enhanced Copper
003
003
004
90.5
90.5
104.1
1517
1517
1517

2 1 ⁄8
1 3 ⁄8

001
63.6
1517

21⁄8
11⁄8
Shell and
002
69.3
1517

105
115.8
1517

006
142.3
1517

006
142.3
1517

2068

2068

2068

2068

2068

2068

2068

2068

5
⁄

12

5
⁄

12

5
⁄

12

2068
2068
2068
Steel Weld Couplings
5
5
5
1⁄2
1⁄2
1⁄2

5
⁄

12

5
⁄

12

5
⁄

12

12

5
⁄

5
⁄

009
2205

*Charges listed are for 30HXC units. The 30HXA units are shipped with a holding charge only.

8

009
2205

12

5
⁄

5
⁄

IMPORTANT: Some of the unit skids are larger than
standard door openings. Be sure that the path to the
unit’s final destination is wide enough to accommodate unit shipping skid. Remove the skid if necessary.
If skid is removed and rollers are used, attach rollers
to unit tube sheets while moving unit.

Tighten all cooler head bolts to 250 ft-lb (339 N-m)
before filling system with water (or brine).
6. Install field-supplied differential flow switches in the cooler
piping for protection against loss of flow. The differential
flow switches must be installed on top of the pipe in a
horizontal run and should be at least 5 pipe diameters from
any bend. Install the low-pressure differential flow switch
into the outlet line piping, and install the high-pressure
differential flow switch into the inlet line piping as shown
in Fig. 8.
7. Provide openings in fluid piping for pressure gages and
thermometers (if used). These openings should be 5 to 10
pipe diameters from the unit water nozzles. For thorough
mixing and temperature stabilization, wells in the leaving fluid pipe should extend at least 2 in. (50 mm) into
the pipe.

Areas where unit mounting points will be located must be
level to within 1⁄16 in. per ft (1 mm per m) along the long
axis of the unit. Once unit is in place and level, bolt unit to
the floor. Use isolation pads under the unit to aid in vibration
isolation as required.

Step 3 — Piping Connections — See Fig. 6 and
7 for typical piping applications.
COOLER FLUID, VENT, AND DRAIN — The inlet (return) fluid connection is always the lower of the 2 cooler
connections. See Fig. 6 for locations. A screen strainer with
a minimum of 20 mesh should be installed ahead of the cooler
inlet to prevent debris from damaging internal tubes of the
cooler. Outlet (supply) fluid connection is the upper connection of the 2 cooler connections.
The cooler has weld flanges to connect the field-supplied
piping. Plan the piping arrangement in accordance with good
piping practices and so that the piping does not cross in front
of the cooler head. Use flexible connections on cooler piping to reduce vibration transmission. Offset the piping to permit removal of the cooler head for maintenance. Install pipe
hangers where needed. Make sure no weight or stress is placed
on the water nozzle.
To install cooler piping:
1. Remove bolts on weld flanges, and remove flanges from
cooler fluid heads.

Accessory Victaulic-type connections are available. Follow the connection directions provided with the accessory.
Although cooler has an air vent, it is recommended that a
field-supplied air vent be installed in the system to facilitate
servicing. Field-supplied shut-off and balancing valves should
also be installed to facilitate servicing and flow balancing.
Locate valves in return and supply fluid lines as close to the
chiller as possible. Locate air vent at highest point of the
cooler fluid system. See Fig. 6.
Provide drain connections at all low points to permit complete drainage of the system.
BRINE UNITS — Special factory modifications to the units
are required to allow them to operate at fluid temperatures
less than 34 F (1.1 C). Be sure that the fluid has sufficient
inhibited ethylene glycol or other suitable corrosionresistant antifreeze solution to prevent cooler freeze up.

Remove the weld flanges before welding piping to
the flanges. Refer to Fig. 1-4 for weld flange locations. Failure to remove the flanges may damage the
sensors and insulation.

PREPARATION FOR YEAR-ROUND OPERATION — In
areas where the piping or unit is exposed to 32 F (0 °C) or
lower ambient temperatures, freeze-up protection is recommended using inhibited ethylene glycol or other suitable
corrosion-resistant antifreeze solution and electric heater tapes.
Heater tapes should have a rating for area ambient temperatures and be covered with a suitable thickness of closed-cell
insulation. Route power for the heater tapes from a separatelyfused disconnect. Mount the disconnect within sight from
the unit per local or NEC codes. Identify disconnect as heater
tape power source with warning that power must not be turned
off except when servicing unit.
Fill the fluid loop with water (or brine) and a corrosionresistant inhibitor suitable for the water of the area. Consult
the local water authority for characteristics of area water and
a recommended inhibitor for the cooler fluid loop. It is recommended that once the cooler water lines have been
installed and leak checked that the cooler heads be insulated
with a suitable thickness of closed-cell insulation. This will
minimize the amount of condensation that will form on the
cooler heads.

2. To keep debris from entering the heat exchanger during
shipping and storage, the gaskets between the weld flanges
and the fluid heads do not have holes cut into them. The
gaskets have perforations where the holes are to be cut.
Carefully cut a hole along the designated perforations.
IMPORTANT: Be sure to remove flanges and cut
holes in the gaskets between the flanges and the fluid
heads as indicated.
3. Apply a thin coat of oil to both sides of each gasket to
help ensure a good seal, and reattach each gasket to each
fluid head.
4. Weld the field-supplied piping to the weld flanges.
5. Bolt the weld flanges back onto their respective fluid heads.
IMPORTANT: When bolting the weld flanges to the
fluid heads, be sure to locate the flange such that
the hole in each flange lines up completely with the
hole in each fluid head. If installed incorrectly, part
of the hole in the fluid head will be blocked off.
This will result in impaired fluid flow in high pressure drop applications.

IMPORTANT: Before starting the unit, be sure all of
the air has been purged from the system.
A drain connection is located at the bottom of the cooler
head. See Fig. 3 and 4 for connection location. Install shutoff valves to the drain line before filling the system with fluid.

9

10

Field Wiring
Field Piping

Fig. 6 — Typical Cooler (30HXA, HXC) and Condenser (30HXC Only) Piping and Wiring

NOTES:
1. Wiring and piping shown are for general point-of-connection only and are not
intended to show details for specific installation. Certified field wiring and
dimensional diagrams are available upon request. The 30HXA and HXC units
should be installed using certified drawings.
2. All wiring must comply with applicable codes.
3. Refer to Carrier System Design Manual for details regarding piping techniques.
4. Piping, wiring, switches, valves, vent, gages, strainers, drain, and vibration isolation are all field supplied.
LEGEND

NOTES:
1. Piping shown is for general point-of-connection only and is not intended to show details for a specific installation. Certified field wiring and dimensional drawings are available upon request. The 30HXA
units should be installed using certified drawings.
2. Refer to Carrier System Design Manual for details regarding piping techniques.
3. Piping and pressure relief devices are field supplied.
4. Vent pipes properly per local codes.

TO REMOTE
CONDENSER(S)
TO REMOTE
CONDENSER(S)
TO REMOTE
CONDENSER(S)

COOLER*

TO REMOTE
CONDENSER(S)

EXV

EXV

PRESSURE
RELIEF

OIL
SEPARATOR
LIQUID LINE
DISCHARGE
LINE
ANGLE
VALVE

LIQUID LINE

LEGEND
EXV — Electronic Expansion Valve
*See Fig. 6 for typical cooler piping.

Fig. 7 — Typical 30HXA Refrigerant Piping to Remote Condenser

30HXA REFRIGERANT PIPING (See Fig. 7) — Take
care when running the refrigerant piping from the 30HXA
unit to the remote condenser(s) to avoid excessive pressure drops. The pressure drop using R-134a refrigerant is
different than when using R-22 refrigerant. See Tables 2 and
3 for an example for a 2 F (1.1 C) pressure drop in saturated
temperature in the discharge (hot gas) line and liquid line,
respectively. Refer to Fig. 9 and 10 for line sizing information for the discharge and liquid lines for 30HXA (R-134a)
units.
Table 2 — Discharge Line 2 F (1.1 C) Drop in
Saturated Temperature Example
SATURATED
DISCHARGE
TEMP
F
C
126
52.2
124
51.1
D PRESSURE

PRESSURE
R-134a
Psig
187.5
182.0
5.5

kPa
1293
1255
38

R-22
Psig
281.6
274.3
7.3

kPa
1942
1891
51
LEGEND
COM — Common
N.O. — Normally Open

Fig. 8 — Differential Flow Switch

11

NOTES:
1. Values are for a 2° F pressure drop at 125 F (51.7 C) saturated discharge temperature, 120 F (48.9 C) saturated condensing temperature, and 105 F (40.6 C)
liquid refrigerant temperature.
2. Size each circuit separately.

Fig. 9 — R-134a Liquid Line Sizing, 30HXA Units

Table 3 — Liquid Line 2 F (1.1 C) Drop in
Saturated Temperature Example
SATURATED
LIQUID
TEMP
F
C
100
37.7
98
36.7
D PRESSURE

IMPORTANT: There is a Schrader-type fitting in each
of the two 1⁄4-in. fittings. These Schrader-type fittings
MUST BE REMOVED before running the line.

PRESSURE
R-134a
Psig
124.3
120.1
4.2

kPa
857
828
29

R-22
Psig
195.9
190.2
5.7

The 30HXA units are shipped from the factory with a holding charge of R-134a. Before opening the refrigerant system, relieve system pressure and recover system refrigerant
through the charging valve on the cooler.

kPa
1351
1311
40

30HXC CONDENSER CONNECTIONS — The inlet fluid
connection is always the lower of the 2 condenser connections. It is recommended that a screen strainer with a
minimum of 20 mesh be installed ahead of the condenser
inlet to prevent debris from damaging the internal condenser
tubes.
The outlet water connection is the upper connection of
the 2 connections. The condenser has weld couplings to
connect field-supplied piping. Plan the piping arrangement
in accordance with good piping practices and so that the piping does not cross in front of the condenser head. Use flexible connections on the condenser piping to reduce vibration
transmission. Offset the piping to permit condenser head removal for maintenance purposes. Install pipe hangers where
needed. Make sure no weight or stress is placed on the water
nozzle.

Discharge lines should be looped above the compressors
to avoid having charge flowing back to the oil separator and
compressor during unit shutdown. Wrap back-pressure valve
when brazing discharge line to avoid damaging the valve.
It is recommended that field-supplied pressure relief valves
be installed in each discharge line. Most local codes require
that the relief valves be vented directly to the outdoors. The
vent must not be smaller than the relief valve outlet, and the
pressure setting should be 320 psig (2205 kPa).
Run a field-supplied 1⁄4-in. (6.4 mm) copper line between
the back-pressure valve on the oil separator (bottom pressure vessel) to the fitting on the refrigerant line entering the
economizer port of the compressor to measure oil pressure
differential. See Fig. 11. The back-pressure valve and the fitting on the refrigerant line have a 1⁄4-in. flare fitting for making this connection. The flare nut is field supplied.

12

NOTES:
1. Values are for a 2° F pressure drop at 125 F (51.7 C) saturated discharge temperature, 120 F (48.9 C) saturated condensing temperature, and 105 F (40.6 C)
liquid refrigerant temperature.
2. Size each circuit separately.

Fig. 10 — R-134a Discharge Line Sizing, 30HXA Units

Fig. 11 — Field-Supplied 1⁄4-in. Copper Tube, 30HXA Units

13

INSTALL PRESSURE RELIEF REFRIGERANT VENT
PIPING — To facilitate refrigerant vent piping, units have
flares for all of the relief fittings. The low side relief valves
on all units are provided with a 3/4 in. NPT flare connections, and are located on the cooler shell. There are 2 relief
valves for the cooler; one on each circuit.
The 30HXA high side relief valve is provided with a
5/8 in. SAE (Society of Automotive Engineers, U.S.A.) flare
connection. The 30HXC high side relief valves are provided
with a 3/4 in. NPT flare connection, and are located on the
condenser shell.
There are 2 relief valves for the separator (30HXA) and
2 for the condenser (30HXC); one for each circuit. Most
local codes require that these devices be piped to the outside. If vent piping is required by local codes, these connections have been provided to aid in the connection of vent
piping in accordance with ASHRAE 15 (American Society
of Heating, Refrigeration, and Air Conditioning Engineers),
Safety Code for Mechanical Refrigeration. If vent piping is
required, do not restrict the vent flow in any way.
NOTE: When accessory suction service valve kit is installed, there are 2 additional high-side pressure relief valves.
Pipe these valves per local codes. These are located on the
discharge line between the muffler and the discharge shutoff valve.

To install condenser piping:
1. Remove bolts on weld flanges, and remove flanges from
condenser water heads.

Remove the weld flanges before welding piping to
the flanges. Refer to Fig. 1 and 2 for weld flange
locations. Failure to remove the flanges may damage the sensors and insulation.
2. To keep debris from entering the heat exchanger during
shipping and storage, the gaskets between the weld flanges
and the water heads do not have holes cut into them. The
gaskets have perforations where the holes are to be cut.
Carefully cut a hole along the designated perforations.
IMPORTANT: Be sure to remove flanges and cut
holes in the gaskets between the flanges and the water heads as indicated.
3. Apply a thin coat of oil to both sides of each gasket to
help ensure a good seal, and reattach each gasket to each
water head.
4. Weld the field-supplied piping to the weld flanges.
5. Bolt the weld flanges back onto their respective water
heads.

Step 4 — Make Electrical Connections — The
electrical characteristics of the available power supply must
agree with the unit nameplate rating. Supply voltage must
be within the limits shown.

IMPORTANT: When bolting the weld flanges to the
water heads, be sure to locate the flange such that
the hole in each flange lines up completely with the
hole in each water head. If installed incorrectly, part
of the hole in the water head will be blocked off.
This will result in impaired water flow in high pressure drop applications.

FIELD POWER CONNECTIONS (See Fig. 12) — All power
wiring must comply with applicable local and national codes.
Install field-supplied, branch circuit fused disconnect(s) of a
type that can be locked off or open. Disconnect(s) must be
located within sight and readily accessible from the unit in
compliance with NEC Article 440-14. See Tables 4A and 4B
for unit electrical data. See Tables 5A and 5B for compressor electrical data.

Provide openings in water piping for pressure gages and
thermometers (if used). These openings should be 5 to 10
pipe diameters from the unit water nozzles. For thorough mixing and temperature stabilization, wells in the leaving water
pipe should extend at least 2 in. (50 mm) into the pipe.
Accessory Victaulic-type connections and condenserwater thermistors are available. Follow the connection directions as provided with the accessory. If accessory differential pressure switch, water flow switch, or condenser water
thermistor is to be installed, install the proper fittings into
the condenser water lines before water is connected.
Although condenser has an air vent, it is recommended
that a field-supplied air vent be installed in the system to
facilitate servicing. Field-supplied shut-off and balancing valves
should also be installed to facilitate servicing and flow balancing. Locate valves in inlet and outlet lines as close to the
chiller as possible. Locate air vents at the highest point of
the system loop. See Fig. 6.
Provide drain connections at all low points in the loop to
permit complete system drainage.
For installations where entering condensing water temperature could be below 70 F (21 C), a field-supplied
leaving water temperature regulating valve is required.
Operation below 70 F (21.1 C) without this valve may cause
the unit to shut down on low oil pressure alarms.

IMPORTANT: the 30HX units have a factory-installed
option available for a non-fused disconnect for unit power
supply. If the unit is equipped with this option, all field
power wiring should be made to the non-fused disconnect since no terminal blocks are supplied.
All units have a single location for power entry to simplify the field power wiring. Maximum wire size that the
unit terminal block or non-fused disconnect will accept is
500 kcmil.
All 380/415-3-50, 460-3-60, and 575-3-60 units require
a single field-supplied power supply. All 230-3-50 and
208/230-3-60 units require 2 separate field-supplied power
supplies.
All 380-3-60 units (except the 30HXC/A186 units)
require a single field-supplied power supply. The
30HXC/A186 units require 2 field-supplied power supplies.
The 30HXA136-186 and 30HXC171,186, 346-3-50 units
require 2 field-supplied power supplies. All other 346-3-50
units require a single field-supplied source.
FIELD CONTROL POWER CONNECTIONS (See
Fig. 13) — Units with a power supply of 208/230-, 460-,
and 575-3-60 require 115-1-60 control circuit power. Units
with a 380-3-60 power supply require 230-1-60 control circuit power. All other units 230-1-50 control circuit power.
Field control power connections are made at terminals 1 and
2 of TB4.

NOTE: This valve should be a temperature-controlled
valve (DO NOT USE a pressure-controlled valve) which
controls to 80 F (26.7 C) leaving water temperature. Be sure
to add a bleed line between the entering and leaving water
lines.

Copy continued on page 26.

14

Table 4A — Unit Electrical Data, 30HXC Units*

UNIT
30HXC

076

086

096

106

116

126

136

146

VOLTAGE
Supplied
Nameplate
(3 Ph)
Min
Max
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342

253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440

POWER CIRCUIT
MCA

MOCP

Recommended
Fuse Size

123/123
100
80
121
115/115
138
126
148/123
111
89
135
140/115
154
140
181/122
126
101
153
169/115
173
158
219/123
143
115
174
202/115
195
178
219/148
153
122
185
202/140
208
190
219/181
165
131
199
202/169
224
204
263/181
184
147
222
245/169
252
230
263/219
198
158
240
245/202
270
246

200/200
150
110
175
200/200
175
175
250/200
150
125
200
250/200
225
200
300/200
175
150
225
300/200
250
225
350/200
200
175
250
350/200
300
250
350/250
225
175
250
350/250
300
250
350/300
225
175
250
350/300
300
300
450/300
250
200
300
400/300
350
300
450/350
250
225
350
400/350
400
350

175/150
125
100
150
150/150
175
150
200/150
125
100
175
75/150
175
175
225/150
150
125
175
225/150
200
200
300/150
175
150
200
250/150
225
225
300/200
175
150
225
250/175
250
225
300/225
200
150
225
250/225
250
250
350/225
225
175
300
300/225
300
300
350/300
225
200
300
300/250
350
300

See legend and notes on page 16.

15

CONTROL CIRCUIT
Voltage
(Single
Ph)
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50

Min

Max

104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198

127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254

MCA

ICF
MOCP

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

WD

XL

307
148
118
169
266
118
165
307
148
118
169
305
208
190
354
172
137
195
347
237
216
405
197
158
223
397
271
247
426
207
166
234
417
284
259
452
219
175
248
440
300
273
512
249
199
282
496
338
308
542
262
210
299
523
355
324

†
374
299
419
†
†
400
†
374
299
419
†
†
479
†
449
359
502
†
†
562
†
529
423
590
†
†
661
†
539
431
601
†
†
673
†
551
440
615
†
†
687
†
646
536
720
†
†
797
†
659
547
737
†
†
813

Table 4A — Unit Electrical Data, 30HXC Units* (cont)

UNIT
30HXC

161

171

186

VOLTAGE
Supplied
Nameplate
(3 Ph)
Min
Max
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342

253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440

POWER CIRCUIT

CONTROL CIRCUIT

MCA

MOCP

Recommended
Fuse Size

285/197
200
160
242
266/182
273
249
238/285
215
172
260
219/266
145/176
267
285/285
232
185
156/156
266/266
176/176
289

500/350
300
225
350
450/300
400
350
400/500
300
250
350
350/450
250/300
350
500/500
300
250
250/250
450/450
300/300
400

350/250
250
200
300
350/225
350
300
300/400
250
200
300
300/350
175/225
300
400/400
300
225
200/200
350/350
225/225
350

LEGEND
— Maximum Instantaneous Current Flow during start-up
(the point in the starting sequence where the sum of the
LRA for the start-up compressor, plus the total RLA for
all running compressors, plus the total FLA for all running fan motors is at a maximum)
MCA — Minimum Circuit Ampacity (for wire sizing)
MOCP — Maximum Overcurrent Protection
RLA
— Rated Load Amps
WD
— Wye-Delta Start
XL
— Across-the-Line Start
*Refer to Carrier’s electronic catalog for the most current electrical
data.
†Wye-Delta Start is standard. Not available in across-the-line start.
**The 30HX186 units have 2 terminal blocks/non-fused disconnects
and 6 parallel conductors/non-fused disconnects.
††The 30HXC171 and 186 units have 2 terminal blocks/non-fused
disconnects and 6 parallel conductors/non-fused disconnects.
NOTES:
1. Main power must be supplied from a field-supplied fused electrical service with a (factory- or field-installed) disconnect located in
sight from the unit.
2. Control circuit power must be supplied from a separate source through
a field-supplied disconnect. The control circuit accessory transformer may be applied to power from the main unit power supply.
3. Maximum incoming wire size for each terminal block is 500 kcmil.
4. Maximum allowable phase imbalance is: voltage, 2%; amps, 5%.
5. Units with one MCA value have one main terminal block. Units
with 2 MCA values require multiple conductors.
6. Use copper conductors only.

Voltage
(Single
Ph)
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50

Min

Max

104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198

127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254

MCA

ICF
MOCP

15

15

15

15

15

15

WD

XL

591
287
230
325
578
394
358
624
302
242
343
607
413
376
661
319
255
364
645
438
399

†
756
605
843
†
†
944
†
771
617
861
†
†
962
†
788
630
882
†
†
985

7. The MOCP is calculated as follows:
MOCP = (2.25) (largest RLA) + the sum of the other RLAs. Size
the fuse one size down from the result. The RLAs are listed on the
unit nameplate.
The recommended fuse size in amps (RFA) is calculated as
follows:
RFA = (1.50) (largest RLA) + the sum of the other RLAs. Size
the fuse one size up from the result. The RLAs are listed on the
unit nameplate.
8. Units have the following power wiring terminal blocks and parallel
conductors:

ICF

VOLTAGE
208/230
460
575
380**
230
346††
380/415

16

TERMINAL
BLOCKS
OR NON-FUSED
DISCONNECTS
2
1
1
1
2
1
1

PARALLEL
CONDUCTORS
OR NON-FUSED
DISCONNECTS
6
3
3
3
6
3
3

Table 4B — Unit Electrical Data, 30HXA Units*

UNIT
30HXA

076

086

096

106

116

126

136

146

VOLTAGE
Supplied
Nameplate
(3 Ph)
Min
Max
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342

253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440

POWER CIRCUIT
MCA

MOCP

Recommended
Fuse Size

180/180
146
117
177
169/169
201
183
215/180
162
130
196
205/169
225
206
262/180
183
147
222
248/169
254
231
319/180
209
167
253
300/169
289
263
319/215
222
177
269
300/205
308
281
319/262
239
191
289
300/248
331
302
389/262
271
216
328
369/248
245/164
343
389/319
291
233
353
369/300
245/199
369

300/300
200
150
250
300/300
250
250
350/300
225
175
250
350/300
300
300
450/300
250
200
300
400/300
350
350
500/300
300
250
350
500/300
400
400
500/350
300
250
400
500/350
450
400
500/450
350
250
400
500/400
400
400
700/450
400
300
450
600/400
400/250
500
700/500
400
300
500
600/500
400/350
500

225/225
175
150
200
225/225
225
225
300/225
200
150
225
250/225
300
250
350/225
225
175
300
300/225
300
300
400/225
250
200
300
400/225
350
300
400/300
300
200
350
400/250
350
350
400/350
300
225
350
400/300
400
350
500/350
350
250
400
450/300
300/200
400
500/400
350
300
400
450/400
300/250
450

See legend and notes on page 18.

17

CONTROL CIRCUIT
Voltage
(Single
Ph)
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50

Min

Max

104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198

127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254

MCA

ICF
MOCP

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

WD

XL

451
218
175
248
440
299
273
511
248
199
282
496
337
308
577
281
225
318
567
386
352
662
324
259
365
620
423
385
690
337
269
380
649
443
402
728
354
283
401
683
465
423
791
386
309
436
817
557
507
837
406
325
461
859
585
532

†
550
440
615
†
†
687
†
645
536
720
†
†
797
†
750
600
836
†
†
938
†
885
708
985
†
†
1042
†
898
718
1000
†
†
1059
†
915
732
1021
†
†
1080
†
1015
812
1132
†
†
1346
†
1035
828
1157
†
†
1371

Table 4B — Unit Electrical Data, 30HXA Units* (cont)

UNIT
30HXA

161

171

186

VOLTAGE
Supplied
Nameplate
(3 Ph)
Min
Max
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

187
414
518
342
207
325
342
187
414
518
342
207
325
342
187
414
518
342
207
325
342

253
506
633
418
253
380
440
253
506
633
418
253
380
440
253
506
633
418
253
380
440

POWER CIRCUIT

CONTROL CIRCUIT

MCA

MOCP

Recommended
Fuse Size

437/295
304
243
368
415/275
276/183
385
359/437
327
261
396
334/415
222/276
413
437/437
355
284
239/239
415/415
276/276
453

700/500
450
350
500
700/450
450/300
500
600/700
450
350
500
600/700
350/450
600
700/700
500
400
400/400
700/700
450/450
600

600/400
350
300
450
500/350
350/225
450
450/600
400
300
450
450/500
300/350
500
600/600
400
350
300/300
500/500
350/350
600

LEGEND
— Maximum Instantaneous Current Flow during start-up
(the point in the starting sequence where the sum of the
LRA for the start-up compressor, plus the total RLA for
all running compressors, plus the total FLA for all running fan motors is at a maximum)
MCA — Minimum Circuit Ampacity (for wire sizing)
MOCP — Maximum Overcurrent Protection
RLA
— Rated Load Amps
WD
— Wye-Delta Start
XL
— Across-the-Line Start
*Refer to Carrier’s electronic catalog for the most current electrical
data.
†Wye-Delta Start is standard. Not available in across-the-line start.
**The 30HX186 units have 2 terminal blocks/non-fused disconnects
and 6 parallel conductors/non-fused disconnects.
††The 30HXA136-186 units have 2 terminal blocks/non-fused
disconnects and 6 parallel conductors/non-fused disconnects.
NOTES:
1. Main power must be supplied from a field-supplied fused electrical service with a (factory- or field-installed) disconnect located in
sight from the unit.
2. Control circuit power must be supplied from a separate source through
a field-supplied disconnect. The control circuit accessory transformer may be applied to power from the main unit power supply.
3. Maximum incoming wire size for each terminal block is 500 kcmil.
4. Maximum allowable phase imbalance is: voltage, 2%; amps, 5%.
5. Units with one MCA value have one main terminal block. Units
with 2 MCA values require multiple conductors.
6. Use copper conductors only.

Voltage
(Single
Ph)
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50
115-60
115-60
115-60
230-60
230-50
230-50
230-50

Min

Max

104
104
104
207
198
198
198
104
104
104
207
198
198
198
104
104
104
207
198
198
198

127
127
127
254
254
254
254
127
127
127
254
254
254
254
127
127
127
254
254
254
254

MCA

ICF
MOCP

15

15

15

15

15

15

WD

XL

979
478
382
539
858
535
533
1030
501
401
567
905
616
562
1093
529
539
601
970
660
601

†
1282
1025
1428
†
†
1398
†
1305
1044
1456
†
†
1427
†
1333
1066
1490
†
†
1466

7. The MOCP is calculated as follows:
MOCP = (2.25) (largest RLA) + the sum of the other RLAs. Size
the fuse one size down from the result. The RLAs are listed on the
unit nameplate.
The recommended fuse size in amps (RFA) is calculated as
follows:
RFA = (1.50) (largest RLA) + the sum of the other RLAs. Size
the fuse one size up from the result. The RLAs are listed on the
unit nameplate.
8. Units have the following power wiring terminal blocks and parallel
conductors:

ICF

VOLTAGE
208/230
460
575
380**
230
346††
380/415

18

TERMINAL
BLOCKS
OR NON-FUSED
DISCONNECTS
2
1
1
1
2
1
1

PARALLEL
CONDUCTORS
OR NON-FUSED
DISCONNECTS
6
3
3
3
6
3
3

Table 5A — Compressor Electrical Data, 30HXC Units
UNIT SIZE
30HXC

076

076-WD

086

086-WD

096

096-WD

106

106-WD

116

116-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
44.3
35.4
53.7
*
*
55.8
98.1
44.3
35.4
53.7
92.1
61.1
55.8
*
53.6
42.8
64.9
*
*
67.7
118.6
53.6
42.8
64.9
111.8
74.2
67.7
*
65.5
52.3
79.2
*
*
81.7
144.9
65.5
52.3
79.2
134.9
89.5
81.7
*
79.2
63.3
95.9
*
*
97.8
175.4
79.2
63.3
95.9
161.7
107.3
97.8
*
79.2
63.3
95.9
*
*
87.8
175.4
79.2
63.3
95.5
161.7
107.3
97.8

B1
LRA
*
330
264
365
*
*
344
209
104
83
115
174
120
109
*
330
264
365
*
*
423
209
104
83
115
213
147
134
*
405
324
448
*
*
506
256
128
102
141
255
176
160
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
485
388
536
*
*
605
307
153
123
169
305
210
191

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

19

RLA
*
44.3
35.4
53.7
*
*
55.8
98.1
44.3
35.4
53.7
92.1
61.1
55.8
*
44.3
35.4
53.7
*
*
55.8
98.1
44.3
35.4
53.7
92.1
61.1
55.8
*
44.3
35.4
53.7
*
*
55.8
98.1
44.3
35.4
53.7
92.1
61.1
55.8
*
44.3
35.4
53.7
*
*
55.8
98.1
44.3
35.4
53.7
92.1
61.1
55.8
*
53.6
42.8
64.9
*
*
67.7
118.6
53.6
42.8
64.9
111.8
74.2
67.7

LRA
*
330
264
365
*
*
344
209
104
83
115
174
120
109
*
330
264
365
*
*
344
209
104
83
115
174
120
109
*
330
264
365
*
*
344
209
104
83
115
174
120
109
*
330
264
365
*
*
344
209
104
83
115
174
120
109
*
330
264
365
*
*
423
209
104
83
115
213
147
134

Table 5A — Compressor Electrical Data, 30HXC Units (cont)
UNIT SIZE
30HXC

126

126-WD

136

136-WD

146

146-WD

161

161-WD

171

171-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
79.2
63.3
95.9
*
*
97.8
175.4
79.2
63.3
95.9
161.7
107.3
97.8
*
94.9
75.8
114.9
*
*
118.8
210.0
94.6
75.8
114.9
196.3
130.3
118.8
*
94.9
75.8
114.9
*
*
118.8
210.0
94.9
75.8
114.9
196.3
130.3
118.8
*
103.1
82.4
124.8
*
*
128.6
228.8
103.1
82.4
124.8
212.5
141.0
128.6
*
86.1
68.8
104.2
*
*
105.8
190.6
86.1
68.8
104.2
174.8
116.0
105.8

B1
LRA
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
580
484
641
*
*
715
367
183
147
203
361
248
226
*
580
484
641
*
*
715
367
183
147
203
361
248
226
*
685
548
757
*
*
856
433
216
173
239
432
297
270
*
580
484
641
*
*
715
367
183
147
203
361
248
233

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

20

RLA
*
65.5
52.3
79.2
*
*
81.7
144.9
65.5
52.3
79.2
134.9
89.5
81.7
*
65.5
52.3
79.2
*
*
81.7
144.9
65.5
52.3
79.2
134.9
89.5
81.7
*
79.2
63.3
95.9
*
*
97.8
175.4
79.2
63.3
95.9
161.7
107.3
97.8
*
71.2
56.9
86.2
*
*
88.2
157.6
71.2
56.9
86.2
145.7
96.7
88.2
*
103.1
82.4
124.8
*
*
128.6
228.8
103.1
82.4
124.8
212.5
141.0
128.6

LRA
*
405
324
448
*
*
506
256
128
102
141
255
176
160
*
405
324
448
*
*
506
256
128
102
141
255
176
160
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
525
420
580
*
*
600
350
175
140
193
348
232
200
*
685
548
757
*
*
856
433
216
173
239
432
297
270

Table 5A — Compressor Electrical Data, 30HXC Units (cont)
UNIT SIZE
30HXC

186

186-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
103.1
82.4
124.8
*
*
128.6
228.8
103.1
82.4
124.8
212.5
141.0
128.6

B1
LRA
*
685
548
757
*
*
856
433
216
173
239
432
297
270

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

21

RLA
*
103.1
82.4
124.8
*
*
128.6
228.8
103.1
82.4
124.8
212.5
141.0
128.6

LRA
*
685
548
757
*
*
856
433
216
173
239
432
297
270

Table 5B — Compressor Electrical Data, 30HXA Units
UNIT SIZE
30HXA

076

076-WD

086

086-WD

096

096-WD

106

106-WD

116

116-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
64.9
51.9
78.7
*
*
81.5
143.8
64.9
51.9
78.7
134.8
89.4
81.5
*
77.6
62.1
94.0
*
*
99.2
171.9
77.6
62.1
94.0
163.9
108.8
99.2
*
94.8
75.7
114.7
*
*
119.9
209.8
94.8
75.5
114.7
198.2
131.4
119.9
*
115.4
92.2
139.7
*
*
145.4
255.5
115.4
92.2
139.7
240.2
159.4
145.4
*
115.4
92.2
139.7
*
*
145.4
255.5
115.4
92.2
139.7
240.2
159.4
145.4

B1
LRA
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
580
484
641
*
*
715
367
183
147
203
361
248
226
*
685
548
757
*
*
856
433
216
173
239
432
297
270
*
820
656
906
*
*
960
518
259
207
286
485
334
303
*
820
656
906
*
*
960
578
259
207
286
485
334
303

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

22

RLA
*
64.9
51.9
78.7
*
*
81.5
143.8
64.9
51.9
78.7
134.8
89.4
81.5
*
64.9
51.9
78.7
*
*
81.5
143.8
64.9
51.9
78.7
134.8
89.4
81.5
*
64.9
51.9
78.7
*
*
81.5
143.8
64.9
51.9
78.7
134.8
89.4
81.5
*
64.9
51.9
78.7
*
*
81.5
143.8
64.9
51.9
78.7
134.8
89.4
81.5
*
77.6
62.1
94.0
*
*
99.2
171.9
77.6
62.1
94.0
163.9
108.8
99.2

LRA
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
485
388
536
*
*
685
307
153
123
169
305
210
191
*
485
388
536
*
*
605
307
153
123
169
305
210
191
*
580
484
641
*
*
715
367
183
147
203
361
248
226

Table 5B — Compressor Electrical Data, 30HXA Units (cont)
UNIT SIZE
30HXA

126

126-WD

136

136-WD

146

146-WD

161

161-WD

171

171-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
115.4
92.2
139.7
*
*
145.4
255.5
115.4
92.2
139.7
240.2
159.4
145.4
*
140.7
112.4
170.2
*
*
178.8
311.4
140.7
112.4
170.2
295.3
195.9
178.8
*
140.7
112.4
170.2
*
*
178.8
311.4
140.7
112.4
170.2
295.3
195.9
178.8
*
157.9
126.2
191.2
*
*
201.2
349.6
157.9
126.2
191.2
332.3
220.5
201.2
*
129.6
103.6
156.9
*
*
161.7
286.9
129.6
103.6
156.9
267.2
177.3
161.7

B1
LRA
*
820
656
906
*
*
960
518
259
207
286
485
334
303
*
920
736
1017
*
*
1226
581
291
233
321
619
426
387
*
920
736
1017
*
*
1226
581
291
233
321
619
426
387
*
1175
940
1299
*
*
1265
743
371
297
410
638
439
400
*
920
736
1017
*
*
1226
581
291
233
321
619
426
387

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

23

RLA
*
94.8
75.7
114.7
*
*
119.9
209.8
94.8
75.7
114.7
198.2
131.4
119.9
*
94.8
75.7
114.7
*
*
119.9
209.8
94.8
75.7
114.7
198.2
131.4
119.9
*
115.4
92.2
139.7
*
*
145.4
255.5
115.4
92.2
139.7
240.2
159.4
145.4
*
106.6
85.1
129.0
*
*
133.4
235.9
106.6
85.1
129.0
220.3
146.2
133.4
*
157.9
126.2
191.2
*
*
201.2
349.6
157.9
126.2
191.2
332.3
220.5
201.2

LRA
*
685
548
757
*
*
856
447
216
173
239
432
297
270
*
685
548
757
*
*
856
433
216
173
239
432
297
276
*
820
656
906
*
*
960
518
259
207
286
485
334
303
*
790
630
870
*
*
1045
527
263
211
290
607
402
348
*
1175
940
1299
*
*
1265
743
371
297
410
638
439
400

Table 5B — Compressor Electrical Data, 30HXA Units (cont)
UNIT SIZE
30HXA

186

186-WD

NAMEPLATE
V-Hz
(3 Phase)
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50
208/230-60
460-60
575-60
380-60
230-50
346-50
380/415-50

COMPRESSOR NUMBERS
A1
RLA
*
157.9
126.2
191.2
*
*
201.2
349.6
157.9
126.2
191.2
332.3
220.5
201.2

B1
LRA
*
1175
940
1299
*
*
1265
743
371
297
410
638
439
400

RLA
*
157.9
126.2
191.2
*
*
201.2
349.6
157.9
126.2
191.2
332.3
220.5
201.2

LRA
*
1175
940
1299
*
*
1265
743
371
297
410
638
439
400

LEGEND
LRA — Locked Rotor Amps
RLA — Rated Load Amps
WD — Wye-Delta Start
*Units are shipped with wye-delta start as standard. Across-the-line start is not available.

EQUIP
NEC
TB
Y-Delta
XL

—
—
—
—
—

LEGEND
Equipment
National Electrical Code (U.S.A.)
Terminal Block
Wye-Delta Start
Across-the-Line Start
Field Power Wiring
Field Control Wiring
Factory-Installed Wiring

NOTES:
1. Factory wiring is in accordance with NEC. Field modifications or
additions must be in compliance with all applicable codes.
2. Wiring for main field supply must be rated 75° C minimum. Use
copper for all units. Maximum incoming wire size for each terminal
block is 500 kcmil.

Fig. 12 — Field Power Wiring
24

ALM
CCN
COMM
CWFS
CWP
CWPI
EQUIP
GND, GRD
NEC
TB

—
—
—
—
—
—
—
—
—
—

LEGEND
Alarm
Carrier Comfort Network
Communications
Chilled Water (Fluid) Flow Switch
Chilled Water (Fluid) Pump
Chilled Water (Fluid) Pump Interlock
Equipment
Ground
National Electrical Code (U.S.A.)
Terminal Block
Field Power Wiring
Field Control Wiring
Factory-Installed Wiring

NOTES:
1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable codes.
2. Wiring for main field supply must be rated 75° C minimum. Use copper for all units. Maximum incoming wire size
for each terminal block is 500 kcmil.
3. Power for control circuit should be supplied from a separate source through a field-supplied, fused disconnect with
15 amp maximum protection for all control circuits. Connect control circuit power to terminals 1 and 2 of TB4.
Connect neutral side of supply to terminal 2 of TB4. Control circuit conductors for all units must be copper only.
4. Terminals 13 and 14 of TB2 are for field external connection for remote on-off. The contacts must be rated for dry
circuit application capable of handling a 24 vac to 50 mA load. Remove jumper between 13 and 14 of TB2 if remote
on-off is installed.
5. Terminals 11 and 12 of TB2 are for chilled water flow switch (CWFS) and chilled water pump interlock (CWPI)
functions. The contacts must be rated for dry circuit application capable of handling a 24 vac to 50 mA load.
6. Terminals 4 and 5 of TB2 are for control of chilled water pump starter. The maximum load allowed for the chilled
water pump relay is 125 va sealed, 1250 va inrush.
7. Terminals 2 and 3 of TB2 are for alarm. The maximum load allowed for the alarm is 125 va sealed, 1250 va inrush.

Fig. 13 — Field Control Wiring

25

30HXA LOW-AMBIENT OPERATION — If outdoor
ambient operating temperatures below 60 F (15 C) are expected, refer to separate installation instructions for lowambient operation using accessory Motormastert III control.

Terminals TB2-11 and TB2-12 are provided for field installation of a chilled water (fluid) pump interlock (CWPI)
and a chilled water (fluid) flow switch (CWFS). These devices are to be installed in series. Contacts must be rated for
day circuit applications capable of handling a 24-vac to
50 mA load.
Accessory remote on-off switch can be wired into TB2-13
and TB2-14. To use this feature, remove the factory-installed
jumper and install the device in series. See Fig. 13 for remote on-off, CWPI, and CWFS wiring. Contacts must be
rated for dry load application capable of handling a 24-vac
to 50 mA load.

MINIMUM LOAD ACCESSORY — If minimum load
accessory is required, use the appropriate package. Refer to
unit Price Pages or contact your local Carrier representative
for more details. For installation details, refer to separate installation instructions supplied with the accessory package.
MISCELLANEOUS ACCESSORIES — For applications requiring special accessories, the following packages are available: control power transformer, minimum load control, sound
reduction enclosure, external vibration isolation, expanded
display, Victaulic-type connections, temperature reset sensor, and chilled fluid flow switch. Refer to individual accessory installation instructions for installation details.

Do not use interlocks or other safety device contacts
connected between TB2 terminals 13 and 14 as remote
on-off. Connection of safeties or other interlocks between these 2 terminals will result in an electrical
bypass if the REMOTE-OFF-LOCAL switch is in the
LOCAL position. If remote on-off unit control is required, a field-supplied relay must be installed in the
unit control box and wired as shown in Fig. 13. Failure
to wire the remote on-off as recommended will result in
tube freeze damage.

Step 6 — Leak Test Unit
30HXC UNIT — These units are shipped from the factory
with a full charge of R-134a (See Tables 1A and 1B). Perform a leak test to ensure that leaks have not developed
during unit shipment. Dehydration of the system is not required unless the entire refrigerant charge has been lost. There
are a number of Swage-Lok fittings used on the refrigerant
piping. If a leak is detected at any of these fittings, tighten
outside nut 1⁄8 turn.

Terminals 2 and 3 of TB2 have been provided for a
field-supplied remote alarm (ALM). If an audible alarm is
installed, an alarm shutoff is also recommended. Contacts
are rated for 125 va at either 115 or 230 v control power. See
Fig. 13.
Terminals 4 and 5 of TB2 have been provided for a
field-supplied chilled water (fluid) pump relay (CWP). A
field-supplied power supply of appropriate voltage must be
provided. Contacts are rated for 125 va at either 115 or
230 v control power. See Fig. 13.
Terminals 1 and 6 of TB2 have been provided for a
field-supplied control relay for the remote condenser (30HXA)
or a condenser pump relay (30HXC). A field-supplied power
supply of appropriate voltage must be provided.

DO NOT OVERTIGHTEN THESE FITTINGS. Overtightening will result in the tube being crushed and will
cause a refrigerant system leak.
30HXA UNITS — These units are shipped with a holding
charge of R-134a. Leak test and dehydrate the complete system (including both field and factory installed piping).

Step 7 — Refrigerant Charge

Step 5 — Install Accessories

IMPORTANT: These units are designed for use with
R-134a only. DO NOT USE ANY OTHER refrigerant in these units without first consulting your
Carrier representative.

ELECTRICAL — Several optional control accessories are
available to provide the following features:
• control transformer
• cooler pump/flow switch interlock
• cooler pump control
• expanded display panel
• remote alarm
• remote on-off
• pulldown control
• occupancy scheduling
• demand limit control
• temperature reset (from occupied space or outdoor-air
temperature)
• dual set point control
• condenser water sensors
• level II communications (CCN
[Carrier Comfort Network])

The liquid charging method is recommended for complete charging or when additional charge is required.

When charging, circulate water through the condenser and cooler at all times to prevent freezing. Freezing
damage is considered abuse and may void the Carrier
warranty.

DO NOT OVERCHARGE system. Overcharging results in higher discharge pressure with higher cooling
fluid consumption, possible compressor damage, and higher
power consumption.

Refer to Start-Up and Operation literature and separate accessory installation instructions for additional
information.

26

30HXC UNITS — The 30HXC units are shipped from the
factory with a full charge of R-134a. Unit should not need
to be charged at installation unless a leak was detected in
Step 6 — Leak Test Unit section on page 26. If dehydration
and recharging is necessary, use industry standard practices
or refer to Carrier Standard Services Techniques Manual as
required.

NOTE: On the units equipped with economizers
(30HXA161-186), the EXV is located inside the economizer so the temperature must be measured entering the
economizer (tube entering bottom of economizer).
3. Check for a clear sight glass. If the unit is not fully loaded,
the sight glass might be flashing. This is normal for a
partially-loaded unit.

30HXA UNITS — The 30HXA units are shipped with a holding charge of R-134a. The complete charge for the 30HXA,
the remote condenser(s), and interconnecting piping must be
field supplied.

Table 6 — 30HXA System Charge for
Start-Up
UNIT
30HXA

To charge the 30HXA systems:
1. Add liquid charge into the cooler using the 1⁄4-in. Schradertype fitting located on the tube going into the bottom
of the cooler. This fitting is located between the electronic expansion valve (EXV) (076-146 units) or the
economizer (161-186 units) and the cooler. Add approximately 2 lb/nominal ton (0.9 kg/nominal kW). This amount
of charge should be sufficient to allow the unit to start.
The approximate system charges are shown in Table 6.
2. Raise the compressor discharge to approximately 125 F
(51.7 C) saturated discharge temperature (185 psig
[1276 kPa]) by throttling the condenser air (or water) intake. Add charge until there is approximately 18 to 20 F
(10.0 to 11.1 C) of system subcooling (saturated discharge temperature − actual temperature entering the EXV).

076
086
096
106
116
126
136
146
161
171
186

27

CIRCUIT A
CHARGE
Lb
Kg
75
34.0
94
42.6
114
51.7
134
60.8
137
62.1
137
62.1
147
66.7
161
73.0
190
86.2
154
69.9
186
84.4

CIRCUIT B
CHARGE
Lb
Kg
75
34.0
80
36.3
80
36.3
80
36.3
95
43.1
116
52.6
125
56.7
132
59.9
132
59.9
186
84.4
186
84.4

PACKAGED SERVICE TRAINING
Our packaged service training programs provide an excellent way to increase your knowledge of the
equipment discussed in this manual. Product programs cover:
• Unit Familiarization
• Maintenance
• Installation Overview
• Operating Sequence
A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.

Copyright 1996 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2
PC 903
Catalog No. 563-052
Printed in U.S.A.
Form 30HX-1SI
Pg 28
5-96
Replaces: New
Tab 5c



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