Small Chassis See Fig, Large Chassis See Fig

When installing the new filter(s), note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.

3.Reinstall filter access panel ensuring opening is air and watertight.

If you have difficulty locating your air filter(s) or have questions concerning proper filter maintenance, contact your dealer for instructions. When replacing filters, always use the same size and type of filter that was supplied originally by the installer.

Replacing or inspecting filters in units with economizers

Small Chassis (See Fig. 9)

1.Remove return air duct cover at rear of unit using a 5/16-in. nut driver.

2.Remove the filter(s) by pulling it out and through the unit duct opening. If filter is dirty, replace both filters with new ones.

When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.

3. Reinstall duct cover ensuring opening is air and watertight.

Table 2 – Indoor Air Filter Data with Economizer


48EZ Unit Size		Filter Size in. (mm)
30-040/060		2 each 20 x 12 x 1
30-040/060		(508 x 305 x 25)
		(508 x 305 x 25)
36-060/090		2 each 20 x 12 x 1
36-060/090		(508 x 305 x 25)
		(508 x 305 x 25)
42-060/090		1 each 24 x 14 x 1 (610 x 356 x 25),
42-060/090		24 x 16 x 1 (610 x 406 x 25)
		24 x 16 x 1 (610 x 406 x 25)
48-090/115/130		1 each 24 x 14 x 1 (610 x 356 x 25),
48-090/115/130		24 x 16 x 1 (610 x 406 x 25)
		24 x 16 x 1 (610 x 406 x 25)
60-090/115/130*		1 each 24 x 16 x 1 (610 x 406 x 25),
60-090/115/130*		24 x 18 x 1 (610 x 457 x 25)
		24 x 18 x 1 (610 x 457 x 25)
*Units with bent indoor	coil.


48VT Unit Size		Filter Size in. (mm)
30-040/060		2 each 20 x 12 x 1
30-040/060		(508 x 305 x 25 mm)
		(508 x 305 x 25 mm)
36-060/090		1 each 24 x 14 x 1 (610 x 406 x 25),
36-060/090		24 x 16 x 1 (610 x 406 x 25)
		24 x 16 x 1 (610 x 406 x 25)
42-060/090		1 each 24 x 14 x 1 (610 x 356 x 25),
42-060/090		24 x 16 x 1 (610 x 406 x 25)
		24 x 16 x 1 (610 x 406 x 25)
48-090/115/130*		1 each 24 x 16 x 1 (610 x 406 x 25),
48-090/115/130*		24 x 18 x 1 (610 x 457 x 25)
		24 x 18 x 1 (610 x 457 x 25)
60-090/115/130*		1 each 24 x 16 x 1 (610 x 406 x 25),
60-090/115/130*		24 x 18 x 1 (610 x 457 x 25)
		24 x 18 x 1 (610 x 457 x 25)
*Units with bent indoor	coil.

Large Chassis (See Fig. 10)

1.Remove filter access door using a 5/16-in. nut driver.

2.Remove the filter(s) by pulling it out and through the unit filter access door. If filter is dirty, replace both filters with new ones.

Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25 mm) filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.

When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.

3.Reinstall filter access door ensuring opening is air and watertight.

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in property damage.

Never operate your unit without filters in place. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and blower motor and/or compressor damage.

RETURN DUCT COVER (Remove for

filter access)

SMALL CHASSIS

A10063

Fig. 9 - Small Chassis Filter Access

FILTER

ACCESS

PANEL

LARGE CHASSIS

A10062

Fig. 10 - Large Chassis Filter Access

Fans and Fan Motors

Periodically check the condition of fan wheels and housings and fan motor shaft bearings. Contact your dealer for the required annual maintenance.

Indoor and Outdoor Coils

Cleaning of the coils should only be done by qualified service personnel. Contact your dealer for the required annual maintenance.

48VT-A, 48EZ-A specifications

The Carrier 48EZ-A and 48VT-A are two advanced rooftop unit air conditioners that exemplify innovation and efficiency in HVAC technology. Designed for commercial applications, these units provide optimal comfort while ensuring energy conservation and reliability.

One of the standout features of the Carrier 48EZ-A is its high-efficiency cooling system. With SEER ratings reaching up to 16, this model uses advanced compressor technology to ensure that energy consumption stays low while maximizing cooling output. The 48EZ-A incorporates a two-stage scroll compressor that enhances performance during partial load conditions, making it ideal for varying temperature demands throughout the day.

Meanwhile, the Carrier 48VT-A is designed with variable speed technology that allows for precise modulation of airflow and cooling capacity, adapting seamlessly to real-time building conditions. This technology not only improves comfort but also significantly reduces energy usage by optimizing operational efficiency.

Both units are equipped with advanced microprocessor controls that facilitate superior management of the HVAC system. The controls offer programmable options allowing for enhanced control over system operation, scheduling, and diagnostics. This promotes easy maintenance and ensures long-term reliability.

In terms of construction, the Carrier 48EZ-A and 48VT-A units are built with corrosion-resistant materials, ensuring durability and longevity even in challenging environments. The cabinet is designed with insulated panels to minimize sound levels, making them suitable for installation in noise-sensitive locations.

Moreover, both models are equipped for easy installation and serviceability. The logical wiring design and access ports streamline maintenance, reducing downtime and optimizing overall performance. Additionally, they feature an energy-efficient fan design that maximizes airflow while minimizing energy use.

In summary, the Carrier 48EZ-A and 48VT-A rooftop units stand out in the HVAC market for their energy efficiency, advanced technology, and durable construction. These features make them ideal choices for various commercial applications where comfort, efficiency, and reliability are paramount. The combination of high-performance components and user-friendly features positions these models as leaders in modern HVAC solutions.