GENERAL

This publication contains Start-Up, Controls, Operation, Service, and Troubleshooting information for the 48/50PD rooftop units. (See Table 1.) These units are equipped with ComfortLinkt controls version 1.X or higher and use Puronr refrigerant. The specific base unit installation instructions and/or wiring label diagram may also be required in conjunction with this book as a guide to a specific unit on the roof. All the units in Table 1 are Displacement Ventilation or Single Zone Variable Airflow units that provide stand-alone or network operation.

Table 1 — Rooftop Units

MODEL

SIZE

NOMINAL TONS

 

 

 

48/50PD

05

4

06

5

 

BASIC CONTROL USAGE

ComfortLink Control

The ComfortLink control is a comprehensive unit-management system. The control system is easy to access, configure, diagnose and troubleshoot.

The ComfortLink control is fully communicating and cable-ready for connection to the Carrier Comfort Network→ (CCN) building management system. The control provides high-speed communications for remote monitoring via the Internet. Multiple units can be linked together (and to other ComfortLink control equipped units) using a 3-wire communication bus.

The ComfortLink control system is easy to access through the use of a unit-mounted display module. There is no need to bring a separate computer to this unit for start-up. Access to control menus is simplified by the ability to quickly select from 11 menus. A scrolling readout provides detailed explanations of control information. Only four, large, easy-to-use buttons are required to maneuver through the entire controls menu. The display readout is designed to be visible even in bright sunlight.

For added service flexibility, an accessory hand-held Navigator™ module is also available. This portable device has an extended communication cable that can be plugged into the unit’s communication network at the main control box. The Navigator display provides the same menu structure, control access and display data as is available at the unit-mounted Scrolling Marquee display.

MODE

 

 

Run Status

 

 

Service Test

 

 

Temperature

 

 

Pressures

 

 

Setpoints

 

 

Inputs

Alarm Status

 

Outputs

ESCAPE

ENTER

Configuration

Time Clock

 

 

Operating Modes

 

 

Alarms

 

 

C06320

Fig. 1 - Scrolling Marquee

Scrolling Marquee

This device is the keypad interface used to access the control information, read sensor values, and test the unit. The Scrolling Marquee is located in the main control box and is standard on all units. The Scrolling Marquee display is a 4-key, 4-character, 16-segment LED (light-emitting diode) display module. The display also contains an Alarm Status LED. (See Fig. 1.)

The display is easy to operate using 4 buttons and a group of 11 LEDs that indicate the following menu structures:

SRun Status

S Service Test

S Temperatures

S Pressures

S Set points

S Inputs

S Outputs

S Configuration

S Timeclock

S Operating Modes

S Alarms

Through the Scrolling Marquee, the user can access all of the

 

inputs and outputs to check on their values and status, configure

 

operating parameters plus evaluate the current decision status for

 

operating modes. The control also includes an alarm history which

 

can be accessed from the display. In addition, through the Scrolling

 

 

Marquee, the user can access a built-in test routine that can be used

 

at start-up commissioning and to diagnose operational problems

48/50PD

with the unit.

Accessory Navigator Display

 

The accessory hand-held Navigator display can be used with the

 

48/50PD units. (See Fig. 2.) The Navigator display operates the

 

same way as the Scrolling Marquee device. The Navigator display

 

is plugged into the LEN (local equipment network) port on either

 

TB1 or the J3 port on the ECB (economizer control board).

 

 

 

 

 

 

 

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Run

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tus

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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empera

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ress

 

 

 

 

 

 

 

 

 

 

 

 

 

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tpoints

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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puts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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utputs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Con

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

figuration

 

 

 

 

 

 

 

 

 

 

 

 

 

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Oper

Clock

 

 

 

E

S C

 

 

 

 

 

 

 

 

 

ating M

 

 

 

 

 

 

 

 

 

 

 

 

 

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odes

 

 

 

 

 

 

 

 

 

 

 

 

 

ENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C06321

Fig. 2 - Accessory Navigator Display

Operation

All units are shipped from the factory with the Scrolling Marquee display, which is located in the main control box. (See Fig. 1.) In addition, the ComfortLink control also supports the use of the handheld Navigator display.

Both displays provide the user with an interface to the ComfortLink control system. The displays have up and down arrow keys, an ESCAPE key and an ENTER key. These keys are used to navigate through the different levels of the display structure. The Navigator display and the Scrolling Marquee operate in the same manner, except that the Navigator display has multiple lines of display and the Scrolling Marquee has a single line. All further discussions and examples in this document will be based on the Scrolling Marquee display. See Table 2 for the menu structure.

The four keys are used to navigate through the display structure, which is organized in a tiered mode structure. If the buttons have not been used for a period, the display will default to the AUTO VIEW display category as shown under the RUN STATUS category. To show the top-level display, press the ESCAPE key until a blank display is shown. Then use the up and

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Carrier 48/50PD05 manual General, Basic Control Usage
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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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