Carrier 48/50PD05 General, Basic Control Usage, ComfortLink Control, Scrolling Marquee, Operation

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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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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