UNIT INTRODUCTION

This 48XL-A unit is a small packaged gas heat/electric cooling sys- tem that can utilize the comfort of gas heating packaged along with efficient electric air conditioning. This unit uses Puron®, the envi- ronmentally friendly refrigerant, for cooling.

OPERATING YOUR UNIT

The operation of your unit is controlled by the Infinityr User Inter- face (UI). You simply program the UI and it maintains the indoor temperature at the level you select. See UI manual for detailed in- structions.

To better protect your investment and to eliminate unnecessary ser- vice calls, familiarize yourself with the following facts:

To start unit gas heat:

Refer to Fig. 2 for location of unit front access panel. Refer to Fig. 3 for location of gas valve. Refer to Fig. 4 while proceeding with the following steps.

1.Set the temperature selector on UI to the lowest temperature setting and set system switch to HEAT.

2.Close the external manual gas shutoff valve.

3.Turn off the electrical supply to the unit.

4.Remove the control access panel with a 5/16-in. nut driver. (See Fig. 3.)

5.Move the selector switch on the internal gas valve to the OFF position and wait 5 minutes.

6.Move the selector switch on the internal gas valve to the ON position.

7.Replace the control access panel.

8.Turn on the electrical supply to unit.

9.Open the external manual gas shutoff valve.

10.Set the temperature selector on UI slightly above room tem- perature to start unit. The induced-draft combustion air fan will start. Main gas valve will open and main burners should ignite within 5 seconds. If the burner does not light within 5 seconds, the ignition module will go into a Retry Mode after a period of approximately 22 seconds (following the 5-second ignition period). If the burners do not light within 15 minutes of the initial call for heat, there is a lockout.

11.Set the temperature selector on UI to desired setting.

Filter Access Panel

For Accessory Filter Rack

Access Panels

A09045

Fig. 2 - Accessory Filter Rack Access Panel

Flue Hood

Burners Gas Valve

A09043

Fig. 3 - Gas Heating/Electric Cooling Unit with Access Panel Removed (Standard unit shown. Actual appearance is shown in Fig. 2.)

!WARNING

FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

1.If the main burners fail to light, or the blower fails to start, shut down gas heating section and call your dealer for service.

2.Never attempt to manually light the main burners on unit with a match, lighter, or any other flame. If the electric sparking device fails to light the main burners, refer to the following shutdown procedures, then call your dealer as soon as possible.

To shut off unit gas heat:

!WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Do not turn off the electrical power to unit without first turning off the gas supply.

Note:If the unit is being shut down because of a malfunction, call your dealer as soon as possible.

Should overheating occur or the gas supply fail to shut off, shut off the external manual gas valve to the unit before shutting off the elec- trical supply. Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water.

Refer to Fig. 4 while proceeding with the following steps.

1.Set the temperature selector on UI to lowest temperature set- ting and set system SWITCH to OFF.

2.Close the external manual shutoff valve.

3.Turn off the electrical power supply to the unit.

4.Remove the control access panel.

5.Move the selector switch on the internal gas valve to the OFF position.

To start unit electric cooling:

Refer to Fig. 5 while proceeding with the following steps.

1.Set the temperature selector on UI to highest temperature setting and set system SWITCH to OFF.

2.Close the external manual shutoff valve, if not already closed.

3.Turn off the electrical power supply to the unit.

3

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Carrier 48XL-A manual Unit Introduction, Operating Your Unit, To start unit gas heat, To shut off unit gas heat
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48XL-A specifications

The Carrier 48XL-A is a highly efficient packaged air conditioning unit designed to meet the rigorous demands of commercial environments. Known for its reliability and advanced technology, this unit delivers superior cooling performance, ensuring optimal comfort in various applications.

One of the standout features of the Carrier 48XL-A is its energy efficiency. With a high Seasonal Energy Efficiency Ratio (SEER) rating, the unit maximizes energy savings while effectively cooling large spaces. This makes it not only economical for users but also environmentally friendly, as it helps reduce carbon emissions associated with cooling.

The 48XL-A incorporates innovative technologies such as advanced scroll compressors, which provide better durability and quieter operation compared to traditional compressors. These scroll compressors are designed for high efficiency and reliability, offering performance that meets the highest industry standards. Additionally, the unit comes equipped with variable-speed blowers, which allow for precise airflow control. This enhances comfort levels by maintaining consistent temperature and humidity in the conditioned space.

Built with a robust design, the Carrier 48XL-A features a durable cabinet constructed to withstand harsh environmental conditions, ensuring long-lasting performance. The unit is also designed for easy maintenance, equipped with accessible components that simplify servicing and reduce downtime.

Another characteristic that stands out is the integrated microprocessor control system, which allows for enhanced diagnostics and operational flexibility. This system provides real-time monitoring and adjustments, ensuring optimal performance and operational efficiency.

The Carrier 48XL-A also includes a range of customizable options, allowing for tailored installations. Users can choose from various cooling and heating configurations to best suit their specific needs.

In summary, the Carrier 48XL-A is a top-tier packaged air conditioning solution that combines energy efficiency, advanced technology, and robust design. Its features and customizable options make it an excellent choice for commercial applications where reliability and performance are paramount. With its focus on energy savings and superior comfort, the Carrier 48XL-A is positioned as a leader in the HVAC industry, catering to the evolving needs of modern buildings.
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