Carrier 39LF, 39LB, 39LD, 39LA, 39LC Belt Small Deflection Force LB Sheave, Cross, PD Range, Section

Page 13

Fig. 14 — Sheave Alignment

6.To determine correct belt tension, use the deflection formula given below and the tension data from Fig. 15 as follows:

EXAMPLE: Given

Belt Span

16 in.

Belt Cross-Section A, Super Belt

Small Sheave PD

5 in.

Deflection = (Belt Span) 64

Solution

1.From Fig. 15 find that deflection force for type A, super belt with 5-in. small sheave PD is 4 to 51/2 lb.

2.

Deflection = 1664

3.Increase or decrease belt tension until force required for 1/4-in. deflection is 51/2 lb.

Check belt tension at least twice during first operating day. Readjust as required to maintain belt tension within the recommended range.

With correct belt tension, belts may slip and squeal momentarily on start up. This slippage is normal and disap- pears after unit reaches operating speed. Excessive belt tension shortens belt life and may cause bearing and shaft damage.

After run-in, set belt tension at lowest tension at which belts will not slip during operation.

Record information on the label (Fig. 16) found on the door of the fan section.

BELT

SMALL

 

DEFLECTION FORCE — LB

SHEAVE

Super

Notch

Steel Cable

CROSS

PD RANGE

Belts

Belts

Belts

SECTION

 

(in.)

Min

 

Max

Min

Max

Min

Max

 

 

 

 

 

3.0-

3.6

3

 

41/4

37/8

51/2

3

4

A

3.8-

4.8

31/2

 

5

41/2

61/4

33/4

43/4

 

5.0-

7.0

4

 

51/2

5

67/8

41/4

51/4

 

3.4-

4.2

4

 

51/2

53/4

8

41/2

51/2

B

4.4-

5.6

51/8

 

71/8

61/2

91/8

53/4

71/4

 

5.8-

8.6

63/8

 

83/4

73/8

101/8

7

83/4

C

7.0-

9.4

111/4

 

143/8

133/4

177/8

111/4

14

9.6-16.0

141/8

 

181/2

151/4

201/4

141/4

173/4

 

 

3V

2.65-3.65

31/2

 

5

37/8

51/2

4.12-6.90

43/4

 

67/8

51/4

77/8

 

 

 

4.40-6.70

 

10

15

5V

7.1-10.9

101/2

 

153/4

127/8

183/4

 

11.8-16.0

13

 

191/2

15

22

8V

12.5-17.0

27

 

401/2

18.0-22.4

30

 

45

 

 

PD — Pitch Diameter, inches

Fig. 15 — Fan Belt Tension Data

NOTICE

TENSION BELTS TO SPECIFICATION SHOWN ON DRIVE LABEL. OVER TENSIONING BELTS WILL SEVERELY REDUCE BELT AND BEARING LIFE.

REPLACEMENT PARTS

BEARINGS

DRIVE _______________________

FREE ________________________

SHAFT ________________________

WHEEL ________________________

INLET CONE ____________________

TO ORDER REPLACEMENT PARTS,

CONTACT: RCD

(REPLACEMENT COMPONENTS DIVISION)

1-800-443-4410

Fig. 16 — Fan Section Label

13

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Contents → Safety Considerations ContentsUnit Identification IntroductionPage Preinstallation Size Service Area RequirementsUnit Size Physical DataUnit Rigging Details Mixing Box InstallationMixing Box Damper Operating Torque In.-lb 39L Unit Size TorqueRecommended Actuators Page IGV Actuator Bracket Installation Install Sheaves on Motor and Fan ShaftsDetermining Sheave-Shaft Overhang Cross Belt Small Deflection Force LB SheavePD Range SectionCoil Freeze-Up Protection Water and Steam Coil Piping RecommendationsLow, Medium or High Pressure Coil Piping Dripping Steam Supply to Condensate Return Chilled Water Coil Circuiting Data Steam Coil Connection Sizes Face Split Coil Suction Line Piping Direct Expansion Coil Circuiting Data ROW COIL†† Small Face Area 39LB, 39LC, 39LF Unit Size Circuiting TypeDistributor Part Numbers Side Connector Hot Gas Bypass Data= 1.68 x .33 x Face Split Coil Manifolding Typical Electric Heater Installation Typical Electric Heater Wiring Schematic Steps FLA Electric Heater DataFan Discharge Positions, Fans without IGVs Wire Size Load AmpsBolt Size Torque START-UPFan Motor Replacement ServiceCoil Cleaning GeneralCoil Removal Field-Installed Coils 39LA,LD OnlyHorizontal Unit Slant Coil Removal 39LA Units Sizes Vertical Unit Slant Coil Removal 39LD Units Sizes Page Changing Coil Hand Fan Shaft Bearing Removal FiltersDX and ALL Water Coils Steam Coils Only Filter Arrangement, 2-in. and 4-in. Flat Filter DataLubricant Data LubricationManufacturer Lubricant 39L Unit Size Cutoff Cutoff ClearanceMetric Conversion Chart Copyright 2004 Carrier Corporation

39LG, 39LH03-25, 39LD, 39LE, 39LB specifications

The Carrier 39 series, encompassing models 39LA, 39LF, 39LC, 39LB, and 39LE, represents a prominent line of rooftop packaged units that combine robust performance, energy efficiency, and advanced technology for commercial applications. Designed to provide reliable heating and cooling solutions, these units stand out for their versatility and innovative features.

The 39LA model offers high efficiency and flexibility, making it ideal for various building types. It incorporates advanced economizer capabilities that enhance indoor air quality while reducing energy costs. The unit is equipped with a dual-walled cabinet, which not only improves durability but also ensures quiet operation, making it suitable for noise-sensitive environments.

The 39LF model further enhances energy savings, featuring a unique hybrid heat pump system. This system allows for both heating and cooling through an integrated design, reducing the need for separate systems and streamlining maintenance requirements. The 39LF also boasts high Seasonal Energy Efficiency Ratio (SEER) ratings, contributing to lower operating costs without compromising comfort.

The 39LC variant excels in humid climates, employing advanced dehumidification technologies that effectively manage indoor moisture levels. This model is often utilized in environments such as gyms, restaurants, and hotels where humidity control is vital. Its variable-speed compressors adjust output based on demand, optimizing energy consumption while maintaining consistent comfort levels.

The 39LB model focuses on enhanced filtration and air quality improvements. Its engineered design accommodates high-efficiency particulate air (HEPA) filters, crucial for spaces that require stringent air quality standards. This model also includes smart controls that allow for precise temperature adjustments, ensuring optimal comfort in any setting.

Finally, the 39LE unit emphasizes user-friendly interfaces and smart technology integration. The built-in Wi-Fi capability enables remote monitoring and operation, allowing managers to adjust settings from anywhere, improving overall energy management. Additionally, the 39LE’s compatibility with Building Management Systems (BMS) facilitates seamless integration into existing setups.

In summary, the Carrier 39 series 39LA, 39LF, 39LC, 39LB, and 39LE present a comprehensive array of features designed for various commercial heating and cooling applications. With an emphasis on energy efficiency, advanced air quality management, and user-friendly technology, these units continue to set the standard for rooftop packaged units in the industry. Their innovative characteristics not only enhance comfort but also promote sustainability, making them a smart choice for modern commercial environments.