Condenser-Fan Adjustment (Fig. 40)

1.Shut off unit power supply.

2.Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews.

3.Adjust fan height as shown in Fig. 40.

4.Tighten setscrews and replace condenser-fan assembly.

48TJ UNIT VOLTAGE

FAN HEIGHT ``A'' (in.)

208/230 V

2.75

460 V and 575 V

3.50

Fig. 40 Ð Condenser-Fan Adjustment

Manual Outdoor-Air Damper Ð If outdoor-air damper blade is required, see Manual Outdoor-Air Damper section on page 11.

Economizer Adjustment Ð Refer to Optional Econo- mizer sections on pages 12 and 15.

Condenser Coil Grille Ð Condenser coil grille is shipped factory-installed. No adjustments are required.

Refrigerant Charge Ð Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to Carrier GTAC 2-5 Charging, Recovery, Recycling, and Rec- lamation training manual and the following procedures.

Unit panels must be in place when unit is operating dur- ing charging procedure.

NO CHARGE Ð Use standard evacuating techniques. After evacuating system, weigh in the speci®ed amount of refrig- erant (refer to Table 1).

LOW CHARGE COOLING Ð Using Cooling Charging Charts, Fig. 41-44, vary refrigerant until the conditions of the appropriate chart are met. Note the charging charts are different from the type normally used. The charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gage and tempera- ture sensing device are required. Connect the pressure gage

to the service port on the suction line. Mount the tempera- ture sensing device on the suction line and insulate it so that outdoor ambient temperature does not affect the reading. Indoor- air cfm must be within the normal operating range of the unit.

TO USE COOLING CHARGING CHART Ð Take the out- door ambient temperature and read the suction pressure gage. Refer to appropriate chart to determine what suction tem- perature should be. If suction temperature is high, add re- frigerant. If suction temperature is low, carefully recover some of the charge. Recheck the suction pressure as charge is ad- justed. Example (Fig. 44, Circuit 2):

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 psig Suction Temperature should be . . . . . . . . . . . . . . . . . . 56 F (Suction temperature may vary ± 5 F.)

If Chargemaster charging device is used, temperature and pressure readings must be accomplished using the charging charts.

Fig. 41 Ð Cooling Charging Chart; 48TJ008

26

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Carrier 48TJF008-012, 48TJE008-014, 48TJD008-014 Condenser-Fan Adjustment Fig, 48TJ Unit Voltage, FAN Height ``A
Page 25 Page 27

48TJF008-012, 48TJD008-014, 48TJE008-014 specifications

Carrier's 48TJD008-014, 48TJE008-014, and 48TJF008-012 series are high-performance packaged rooftop units engineered to meet the heating, ventilation, and air conditioning (HVAC) needs of commercial and industrial applications. These units are renowned for their reliability, energy efficiency, and advanced technologies, making them a popular choice among facility managers and HVAC professionals.

One of the standout features of these Carrier units is their robust construction. Designed to withstand diverse environmental conditions, these units come with durable cabinets that are resistant to corrosion and UV degradation. This durability extends the product lifespan and reduces maintenance needs, providing long-term savings for facility operators.

The series includes models ranging from 8 to 14 tons, catering to a variety of space requirements. Each unit is equipped with a high-efficiency scroll compressor that enhances performance while minimizing energy consumption. This compressor technology guarantees quieter operation, reduced vibrations, and exceptional reliability, which are critical factors in commercial settings.

Energy efficiency is a hallmark of the 48TJD, 48TJE, and 48TJF series. These units come with high Seasonal Energy Efficiency Ratios (SEER) and Energy Efficiency Ratios (EER), which result in lower energy bills and a reduced carbon footprint. The incorporation of advanced digital controls allows for precise temperature management and integration with building management systems, ensuring optimal performance throughout the year.

In terms of comfort features, the Carrier series utilizes variable-speed technology, enabling the fan to adjust its speed according to the load requirements. This results in more consistent temperature control and enhanced indoor air quality. The units also include options for enhanced filtration systems, which can accommodate various filter types, ensuring the removal of airborne particles and allergens.

Installation is simplified with these packaged rooftop units. Their compact design fits well on rooftops or in limited spaces, and they come with factory-installed components, which streamline the setup process. Additionally, the units feature easy access panels for maintenance, allowing technicians to conduct service with minimal disruption to operations.

Finally, Carrier's dedication to innovation is evident in the incorporation of smart technologies within these units. Integrated diagnostics and monitoring systems provide real-time performance data, enabling proactive maintenance and reducing the likelihood of unexpected breakdowns.

In summary, Carrier's 48TJD008-014, 48TJE008-014, and 48TJF008-012 rooftop units are engineered for efficiency, reliability, and comfort. With their durable construction, advanced compressor technology, energy efficiency, comfort features, and ease of installation, these units are ideal for meeting the demanding HVAC needs of commercial spaces.
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