Step 9 — Adjust Evaporator-Fan Speed — Ad-

just evaporator-fan rpm to meet jobsite conditions. Table 5 shows fan rpm at motor pulley settings. Table 6 shows motor performance. See Table 7 for Accessory/FIOP Static Pressure. Refer to Tables 8-29 to determine fan speed settings.

DIRECT-DRIVE MOTORS — The evaporator-fan motor factory speed setting is shown on label diagram affixed to base unit. If other than factory setting is desired, refer to label diagram for motor reconnection. See Fig. 39 for direct drive motor location.

BELT-DRIVE MOTORS — Fan motor pulleys are factory set for speed shown in table 1. See Fig. 40 for belt drive motor location.

NOTE: Before adjusting fan speed, make sure the new fan speed will provide an air temperature rise range as shown in Table 1.

To change fan speed:

1.Shut off unit power supply.

2.Loosen belt by loosening fan motor mounting nuts. See Fig. 40.

3.Loosen movable pulley flange setscrew (see Fig. 41).

4.Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. In- creasing fan speed increases load on motor. Do not ex- ceed maximum speed specified in Table 1.

5.Set movable flange at nearest keyway of pulley hub and tighten setscrew. (See Table 1 for speed change for each full turn of pulley flange.)

Fig. 39 — Direct Drive Motor Mounting

To align fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

Make angular alignment by loosening motor from mounting.

To adjust belt tension:

1.Loosen fan motor mounting nuts.

2.Slide motor mounting plate away from fan scroll for proper belt tension (1/2-in. deflection with one finger).

3.Tighten motor mounting nuts.

4.Adjust bolt and tighten nut to secure motor in fixed position.

MOTOR MOUNTING

PLATE NUTS

Fig. 40 — Belt Drive Motor Mounting

Fig. 41 — Evaporator-Fan Pulley Adjustment

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Carrier 48TF004-007 specifications Adjust Evaporator-Fan Speed Ad, Direct Drive Motor Mounting
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48TF004-007 specifications

The Carrier 48TF004-007 is part of the brand's renowned rooftop unit series, designed to deliver efficient, reliable performance for commercial applications. Ideal for spaces such as offices, retail stores, and small manufacturing facilities, these units encapsulate advanced technology to enhance indoor air quality and optimize climate control.

One of the standout features of the Carrier 48TF004-007 units is their variable speed compressor technology. This innovation not only allows for precise temperature control but also reduces energy consumption by modulating the compressor's speed according to the cooling or heating demand. By operating at lower speeds during less demanding conditions, these units significantly decrease energy usage compared to traditional single-speed compressors, contributing to lower utility bills and a reduced carbon footprint.

Energy efficiency is further enhanced with the inclusion of high-performance scroll compressors, which are known for their reliable operation and quiet performance. Coupled with an Energy Efficiency Ratio (EER) that meets or exceeds industry standards, these systems are designed to offer economical operation without sacrificing comfort.

Incorporating smart controls and connectivity features, the Carrier 48TF004-007 units allow for easy integration into building management systems (BMS). This enhances the ability to monitor and manage energy usage in real time, further promoting efficiency. The units are also compatible with various thermostat options, allowing for user-friendly operation and customization of settings.

Another significant characteristic of the Carrier 48TF004-007 is its durable construction. Built with galvanized steel and powder-coated finishes, these units are designed to withstand the rigors of outdoor installation, ensuring long-lasting performance even in harsh weather conditions. Additionally, the units come equipped with advanced filtration systems that help improve indoor air quality by effectively removing dust, allergens, and other particulate matter from the air.

Maintenance is simplified with the Carrier 48TF004-007, providing easy access to vital components, which supports reduced downtime and service costs. The units also feature low operating sound levels, making them suitable for noise-sensitive applications.

In conclusion, the Carrier 48TF004-007 rooftop units stand out for their energy efficiency, advanced technology, durability, and ease of maintenance, making them an excellent choice for any commercial space looking to enhance comfort while effectively managing operational costs.
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