Accessory Installation

Check to make sure that all accessories including sensors have been installed and wired as required by the instructions and unit wiring diagrams.

Orifice Change (48PD Only)

This unit is factory assembled for heating operation using natural gas at an elevation from sea level to 2000 ft.

Use accessory high altitude kit when installing this unit at an elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.

Use accessory LP (liquid propane) gas conversion kit when converting this unit for use with LP fuel usage for elevations up to 7000 ft. For elevations above 7000 ft, refer to High Altitude section to identify the correct orifice size for the elevation. Purchase these orifices from your local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.

Gas Heat (48PD Only)

Verify gas pressures before turning on heat as follows:

1.Turn off field-supplied manual gas stop, located external to unit.

2.Connect pressure gauge to supply gas tap, located on field-supplied manual shutoff valve. (See F ig. 5.)

3.Connect pressure gauge to manifold pressure tap.

4.Turn on field-supplied manual gas stop. Enter Service Test mode by setting Service Test→TEST to “ON” using the Scrolling Marquee display. Use the Service Test feature to set Service Test→HEAT→HT.1 to ON (first stage of heat) using the Scrolling Marquee.

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Fig. 5 - Field Gas Piping

5.After the unit has run for several minutes, verify the supply gas pressure is between 5.5-in. wg to 13.0-in. wg, and the manifold pressure is 3.50-in. wg on sizes 03-14 and 3.00 on size 16. If manifold pressure must be adjusted, refer to Gas Valve Adjustment section.

IMPORTANT: Supply gas pressure must not exceed 13.0-in. wg.

6.Set Service Test→HEAT→HT.1 to OFF using Scrolling Marquee.

7.Exit Service Test mode by setting Service Test→TEST to “OFF” using the Scrolling Marquee.

CONTROLS QUICK SET-UP

The following information will provide a quick guide to setting up and configuring the 48/50PD series units with ComfortLink™ controls. Unit controls are pre-configured at the factory for factory-installed options. Field-installed accessories will require configuration at start-up. Service Test is recommended for initial start-up. Additionally, specific job requirements may require changes to default configuration values. See the CCN and Display parameter tables and other sections of these instructions for more details.

Control Set Point and Configuration Log

During start up, accessory installation, and equipment service set points and/or configuration changes might have to be made. When setting set points or changing configuration settings, documentation is recommended. The Control Log starting on page 106 should be filled out and left with the unit at all times. A copy should also be provided to the equipment owner.

Standard Unit Control

There are two different applications these units can be applied to, Displacement Ventilation and Single Zone VAV. For either application a direct wired space sensor can be used or a communicating sensor/thermostat can be used. Installation of an accessory supply air temperature (SAT) sensor in the supply duct is recommended when using a communication type control. A supply duct SAT measurement is valid for heating mode display, while the factory-standard internal SAT is not valid for heating due to its location upstream of the heating section. When installing the supply duct SAT, the heating mode display is enabled by setting Configuration→HEAT→SAT→SAT.H to ENBL.

There are several configurations that should be considered for Displacement Ventilation or Single Zone VAV applications. Table 3 shows these configuration defaults and specific application settings. These settings typical values and should be adjusted for each actual specific unit application. Refer to the Operation section for more detail on these configurations and how they effect the units operation.

IMPORTANT: Multiple zoning application is not recommended at this time with the PD product.

Space Temperature Sensor Control—Direct Wired (T-55, T-56, or T-59)

Wire accessory space temperature sensor(s) to the T-55 terminals on the field connection terminal board located at the unit control box. No configuration is required when installing a T-55, T-56, or T-59. Refer to Field-Installed Accessories section for additional information.

T-58 Communicating Thermostat

Install the T-58 communicating thermostat. Connect the CCN communication bus from the T-58 to the CCN terminals on the field connection terminal board located at the unit control box. Configure the unit’s CCN communication element number, bus number, and baud rate. Configure the T-58’s CCN communication bus number and baud rate the same as the unit, while the element number has to be different. Configure the T-58 to send SPT to the unit’s element number. Refer to the Field-Installed Accessories section for additional information.

48/50PD

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Carrier 48/50PD05 manual Controls Quick SET-UP
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48/50PD05 specifications

The Carrier 48/50PD05 is a remarkable addition to Carrier's lineup of rooftop units, offering advanced cooling and heating solutions for commercial applications. Designed for medium-sized buildings, this unit is well-suited for both new installations and as a replacement for older systems, thanks to its versatile features and efficient performance.

One of the standout features of the 48/50PD05 is its energy efficiency. It incorporates state-of-the-art technology to achieve high Seasonal Energy Efficiency Ratios (SEER) and EER ratings, reducing operational costs while delivering superior comfort. The unit is also compliant with the latest energy regulations, making it an environmentally friendly choice for building owners concerned about sustainability.

The 48/50PD05 is equipped with a highly efficient scroll compressor, which not only enhances performance but also contributes to quiet operation. This is a significant advantage in commercial spaces where noise levels need to be kept in check for comfort and productivity. Additionally, the unit includes advanced airflow design, ensuring even distribution of conditioned air throughout the space.

Technologically, the Carrier 48/50PD05 features Carrier's Infinity Control system, which allows for precise control of indoor climate. This intelligent control mechanism can be integrated with smart building management systems, enabling users to monitor and manage energy use effectively. Wi-Fi connectivity is also available, providing remote access for real-time adjustments and diagnostics.

Durability is another characteristic of the 48/50PD05. Constructed with high-quality materials, the unit withstands various environmental conditions, ensuring longevity and reliability. Moreover, the modular design facilitates easy maintenance, making service procedures efficient and cost-effective.

In addition to cooling, the Carrier 48/50PD05 offers heating capabilities, often utilizing gas or electric heating options that can be tailored to the specific needs of a building. The unit can also be equipped with integrated economizers, allowing for free cooling during suitable outdoor conditions, further enhancing energy savings.

Overall, the Carrier 48/50PD05 stands out as a high-performance HVAC solution that combines efficiency, technology, and durability. It provides building owners with a versatile tool to ensure comfort while minimizing their environmental footprint. With a strong emphasis on energy savings and advanced control features, this rooftop unit is a smart investment for any commercial property.
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