Carrier 48AJ installation instructions Unbalanced 3-Phase Supply Voltage

Page 24

Table 8A — Electrical Data — 48AJ,AK,AW,AY Units without Convenience Outlet (cont)

UNIT

VOLTAGE

VOLTAGE

 

 

 

COMPRESSOR

 

 

 

CONDENSER

EVAPORATOR

POWER

POWER SUPPLY

SIZE

RANGE

Cir A, No. 1

Cir A, No. 2

Cir B, No. 1

Cir B, No. 2

FAN MOTOR

FAN MOTOR

EXHAUST

3 PH, 60 Hz

 

 

48A

 

Min

Max

RLA

LRA

RLA

 

LRA

RLA

 

LRA

RLA

LRA

Qty

FLA

Hp

FLA

FLA (total)

MCA

MOCP*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

59.4

250.5

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

285.9

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

74.8

269.7

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.5

35.4

305.1

350

 

208

187

229

34.3

265

34.3

 

265

34.3

 

265

34.3

265

6

 

 

 

 

 

(ea)

30

88

286.2

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

321.6

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

114

318.7

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

354.1

450

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

54

244.3

250

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

279.7

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

68

261.8

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6.6

35.4

297.2

350

 

230

207

253

34.3

265

34.3

 

265

34.3

 

265

34.3

265

6

 

 

 

 

 

(ea)

30

80

276.8

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

312.2

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

104

306.8

400

051

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

342.2

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

27

117.6

125

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

136.5

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

34

126.3

150

 

460

414

508

16

120

16

 

120

16

 

120

16

120

6

3.3

18.9

145.2

175

 

 

 

 

 

 

 

 

(ea)

30

40

133.8

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

152.7

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

52

148.8

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

167.7

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

22

94.7

110

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14.4

109.1

125

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

27

101.0

125

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.6

14.4

115.4

125

 

575

518

632

12.9

80

12.9

 

80

12.9

 

80

12.9

80

6

 

 

 

 

 

(ea)

30

32

107.2

125

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14.4

121.6

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

41

118.5

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14.4

132.9

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

75.0

308.1

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

343.5

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

208

187

229

40.8

265

47

 

380

40.8

 

265

47

380

6

6.5

30

88.0

324.6

400

 

 

 

(ea)

35.4

360.0

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

114.0

357.1

450

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

392.5

450

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

68.0

300.2

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

335.6

350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

230

207

253

40.8

265

47

 

380

40.8

 

265

47

380

6

6.6

30

80.0

315.2

350

 

 

 

(ea)

35.4

350.6

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

104.0

345.2

400

060

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35.4

380.6

450

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

34.0

147.5

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

166.4

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

460

414

508

20.2

135

22.4

 

175

20.2

 

135

22.4

175

6

3.3

30

40.0

155.0

175

 

 

 

(ea)

18.9

173.9

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

52.0

170.0

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

188.9

225

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

27.0

119.8

125

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

138.7

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

575

518

632

16.6

120

18.6

 

140

16.6

 

120

18.6

140

6

2.6

30

32.0

126.0

150

 

 

 

(ea)

18.9

144.9

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

41.0

137.3

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18.9

156.2

175

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LEGEND

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection NEC — National Electrical Code

RLA — Rated Load Amps

*Fuse or HACR circuit breaker per NEC.

NOTES:

1.In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. The Canadian units may be fuse or circuit breaker.

2.Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%. Use the following formula to determine the percent of voltage imbalance.

% Voltage imbalance

max voltage deviation from average voltage

= 100 x

average voltage

Example: Supply voltage is 460-3-60. AB = 452 v

BC = 464 v AC = 455 v

452 + 464 + 455

Average Voltage =

3

= 1371 3

= 457

Determine maximum deviation from average voltage. (AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v Maximum deviation is 7 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

7

 

457

 

= 1.53%

This amount of phase imbalance is satisfactory as it is below the max- imum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

24

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Contents Installation Instructions Make Unit Duct Connections Instructions onRoof Curb 48AJ,AK020-035 Units Roof Curb 48AJ,AK036-050 Units Roof Curb 48AJ,AK051 and 060 Units Base Unit Dimensions 48AJ,AK020-035 A48-8235Base Unit Dimensions 48AJ,AK036-050 A48-8236Base Unit Dimensions 48AJ,AK051 Base Unit Dimensions 48AW,AY020-035 A48-8380Base Unit Dimensions 48AW,AY036-050 Base Unit Dimensions 48AW,AY051 A48-8240Center of Gravity and Weights 48AJ,AK,AW,AY051,060 A50-8102Physical Data 48AJ,AK,AW,AY Units Compressor035 036 040 041 Nominal Capacity tons 050 051 060 Nominal Capacity tons Rigging Information A48-8246Unit Operating Weights Option and Accessory WeightsConstant Volume Fan Motor Weights Evaporator Fan Motor Data Air Distribution Thru-the-BottomInstall Flue Hood A48-3712A48-3823 A48-3714Make Electrical Connections 48A Series Staged Gas ControlA48-2524 Unit Voltage 48A Min Max 46.2 203.6 225 Unbalanced 3-Phase Supply Voltage Electrical Data 48AJ,AK,AW,AY Units with Convenience Outlet FLA MCA030 040 Hacr Size Stage A48-8243 A48-6854CCN Connection Approved Shield Cable Color Code RecommendationsMake Outdoor-Air Inlet Adjustments Adding Seal Strip to Top of Hood Sides48-1104 48-1105A48-4328 A48-8499Route VAV Static Pressure Sensors A48-8244A48-3808 Field Modifications Pressure Transducer LocationsSide Return Air Conversion A48-8245
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48AJ specifications

The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 are cutting-edge rooftop air conditioning units designed for commercial applications. These models are renowned for their reliability, energy efficiency, and innovative technologies aimed at providing optimal indoor comfort.

One of the standout features of these units is their advanced cooling and heating capabilities. They employ a multi-stage compressor system that allows for precise temperature control, accommodating various load requirements. This flexibility is particularly beneficial in commercial settings where the cooling load can fluctuate throughout the day.

Energy efficiency is paramount in today’s environmental landscape, and Carrier has ensured that these models meet stringent efficiency standards. They incorporate high-efficiency scroll compressors, which significantly reduce energy consumption while delivering powerful performance. The units are also equipped with variable speed fans that adjust airflow based on demand, further optimizing energy use.

In terms of construction, these rooftop units feature a robust design that enhances durability and longevity. The cabinet is constructed to withstand harsh weather conditions, ensuring reliable performance year-round. Additionally, the units are equipped with corrosion-resistant coatings, particularly useful in coastal environments where salt exposure can be a concern.

The Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY models utilize advanced controls and connectivity features, allowing for easy integration into building management systems. This connectivity enables remote monitoring and control, facilitating quick response to changing conditions and simplifying maintenance tasks.

Noise reduction is another key characteristic of these models. They are designed with sound-absorbing insulation and low-noise fan blades to ensure quiet operation, making them suitable for noise-sensitive environments such as schools and hospitals.

These units are also available with various options for air filtration and dehumidification. The use of high-efficiency air filters enhances indoor air quality by trapping dust, pollen, and other airborne particles. Enhanced dehumidification capabilities ensure that spaces remain comfortable even in humid conditions.

In conclusion, the Carrier 48EJ, 48AW, 48EK, 48AJ, and 48EY024-068 rooftop units are engineered to offer exceptional performance, energy efficiency, and durability. With their advanced technologies and user-friendly features, they stand out as reliable solutions for meeting diverse commercial cooling and heating needs, making them a popular choice for many businesses.