Carrier 39LE, 39LB Filters, Fan Shaft Bearing Removal, DX and ALL Water Coils Steam Coils Only

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Chilled and hot water coils must not be rotated horizon- tally. If coils are rotated horizontally, severe water blow-off will result.

STEAM INNER DISTRIBUTING TUBE COILS — Rotate in horizontal plane and reinstall. See Fig. 42.

PIPING — Direct expansion, chilled water, and hot water coils should always be piped for counterflow. (Fluid should enter the coil at the leaving-air side.) Steam coils must have the condensate connection at bottom of coil.

To determine intervals for cleaning coils in contaminated air operations, pressure taps should be installed across the coils and checked periodically. Abnormal air pressure drop will indi- cate a need for cleaning the coils.

Annual maintenance should include:

1.Clean the line strainers.

2.Blow down the dirt leg.

3.Clean and check operation of steam traps.

4.Check operation of control valves.

5.Check the operation of check valves to prevent conden- sate flowback.

6.Check operation of thermostatic air vents, if used. A float and thermostatic trap will contain a thermostatic air vent. When the bellows is ruptured, it will fail closed.

7.Check operation of vacuum breakers.

8.Check operation of the thermal protection devices used for freeze-up protection.

9.Steam or condensate should not be allowed to remain in the coil during the off season.This will prevent the forma- tion and build up of acids.

There are additional precautions and control strategies, as found in various catalogues and in the ASHRAE Fundamentals Handbook and in the Carrier System Design Guide — Piping Section, when the entering-air temperature to the coil falls be- low 35 F. These conditions occur when IDT coils are used for pre-heat and/or face and bypass applications.

Freeze up protection:

1.Use a strainer in the supply line and the dirt leg ahead of the trap.

DX AND ALL

WATER COILS

STEAM COILS

ONLY

Fig. 42 — Coil Rotation

2.Use a vacuum breaker in the return.

3.Do not use overhead returns from the coil. A floodback can occur.

4.An immersion thermostat to control outdoor-air dampers and the fan motor is recommended. This control is acti- vated when the steam supply fails or the condensate temperature drops below a predetermined temperature, usually 120 F.

5.On low pressure and vacuum systems, the immersion thermostat may be replaced by a condensate drain with a thermal element. This element opens and drains the coil when the condensate temperature drops below 165 F. Note the thermal condensate drain is limited to 5 psig pressure. At greater coil pressures they will not open.

In spite of the precautions listed above, a coil may still freeze up. An oversize capacity coil, at partial load, with a modulating steam control valve will occasionally freeze. Freezing occurs in the 20 F to 35 F range of entering-air temperatures. A better installation would be an undersize coil, with an on/off control valve with thermostatic control in the outside air, set at 35 F air temperature, installed downstream of the first coil; or setting the minimum steam pressure at 5 psig.

Filters

FILTER SECTIONS — See Table 12 for filter data. Filters are field supplied.

On the size 03 angle filter, a spacer is required on each side of the filters.

Flat filter section can use 2-in. or 4-in. thick filters. (Size 03 accepts 2-in. filters only.) The flat filter section as shipped ac- cepts 2-in. filters. Remove angle spacer in each filter track to provide the 4-in. space required to accommodate 4-in. filters.

On all filter sections except size 03, filters are pushed into the track until they touch the opposite side of the unit. Any re- maining space is taken up by the adjustable 2-piece sheet metal spacer. See Fig. 43 for filter arrangements.

Fan Shaft Bearing Removal

1.Lock open and tag electrical disconnect.

2.Enter through fan section access door or remove panels as required.

3.Place plywood or other rigid covering on floor to protect insulation from damage.

4.Block wheel so that it will not pinwheel due to natural draft through the unit.

5.Loosen motor base to frame bolts. Adjust motor to re- lease belt tension so removal of belts is done without stretching. Do not stretch belts over sheaves. Damage to belt can result.

6.Remove bolts on bushing of fan shaft sheave, insert bolts in jacking hole provided on bushing and slowly jack bushing from sheave. Then remove bushing on sheave.

7.Loosen bearing setscrews and locking collar.

8.Remove bearing holddown bolts.

9.Remove bearing while observing the following precautions:

a.Make certain fan shaft surface is not rough or scored. If so, clean up surface with fine emery cloth.

b.Add a few drops of oil after cleanup of shaft end.

It should not be necessary to drive a new bearing onto shaft. If light tapping is needed, do not tap against outer race.

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Contents Contents → Safety ConsiderationsIntroduction Unit IdentificationPage Preinstallation Service Area Requirements SizePhysical Data Unit SizeUnit Rigging Details Installation Mixing BoxMixing Box Damper Operating Torque In.-lb 39L Unit Size TorqueRecommended Actuators Page Install Sheaves on Motor and Fan Shafts IGV Actuator Bracket InstallationDetermining Sheave-Shaft Overhang Belt Small Deflection Force LB Sheave CrossPD Range SectionWater and Steam Coil Piping Recommendations Coil Freeze-Up ProtectionLow, 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 Small Face Area 39LB, 39LC, 39LF Unit Size Circuiting Type ROW COIL††Side Connector Hot Gas Bypass Data Distributor Part Numbers= 1.68 x .33 x Face Split Coil Manifolding Typical Electric Heater Installation Typical Electric Heater Wiring Schematic Electric Heater Data Steps FLAWire Size Load Amps Fan Discharge Positions, Fans without IGVsSTART-UP Bolt Size TorqueService Fan Motor ReplacementCoil Cleaning GeneralField-Installed Coils 39LA,LD Only Coil RemovalHorizontal Unit Slant Coil Removal 39LA Units Sizes Vertical Unit Slant Coil Removal 39LD Units Sizes Page Changing Coil Hand Filters Fan Shaft Bearing RemovalDX and ALL Water Coils Steam Coils Only Filter Data Filter Arrangement, 2-in. and 4-in. FlatLubrication Lubricant DataManufacturer 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.
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