Carrier Explore the Comfort Link Navigator and Handheld Display Module for Enhanced HVAC Control

System diagnostics are enhanced by the use of multiple external sensors for air temperatures, air pressures, refrigerant temperatures, and refrigerant pressures. Unit-mounted actua- tors provide digital feedback data to the unit control.

The ComfortLink control system is fully communicating and cable-ready for connection to the Carrier Comfort Net- work® (CCN) building management system. The control pro- vides 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 communi- cation 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.

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 either at the main control box or at the opposite end of the unit, at a remote modular plug. The Navigator display provides the same menu structure, control access and display data as is available at the unit-mounted scrolling marquee display.

Scrolling Marquee — This device is the standard inter- face used to access the control information, read sensor values, and test the unit. The scrolling marquee is located in the main control box. The scrolling marquee display is a 4-key, 4-char- acter 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 in- dicate the following menu structures, referred to as modes (see Appendix A):

•Run Status

•Service Test

•Temperatures

•Pressures

•Set points

•Inputs

•Outputs

•Configuration

•Timeclock

•Operating Modes

•Alarms

Through the scrolling marquee, the user can access all of the inputs and outputs to check on their values and status, config- ure operating parameters plus evaluate the current decision sta- tus for operating modes. Because the A Series units are equipped with suction pressure and saturated condensing temperature transducers, the scrolling marquee can also display refrigerant circuit pressures typically obtained from service gages. The control also includes an alarm history which can be accessed from the display. In addition, through the scrolling

MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs	Alarm Status
Outputs	ESCAPE	ENTER
Configuration
Time Clock
Operating Modes	A30-2239
Alarms

Fig. 1 — Scrolling Marquee

marquee, the user can access a built-in test routine that can be used at start-up commissioning to diagnose operational prob- lems with the unit.

Accessory Navigator™ Display — The accessory hand-held Navigator display can be used with the A Series units. See Fig. 2. The Navigator display operates the same way as the scrolling marquee device. The Navigator display is plugged into the RJ-14 (LEN) jack in the main control box on the COMM board. The Navigator display can also be plugged into the RJ-14 jack located on the ECB (economizer control board) located in the auxiliary control box.

Operation — All units are shipped from the factory with the scrolling marquee display, which is located in the main con- trol box. See Fig. 1. In addition, the ComfortLink™ controls also support the use of the handheld Navigator display.

Both displays provide the user with an interface to the

ComfortLink control system. The displays have and

arrow keys, an ESCAPE key and an ENTER key. These keys are used to navigate through the different modes of the display structure. The Navigator and the scrolling marquee dis- plays 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 and arrow keys to scroll through the top-level categories (modes). These are listed in Appendix A and will be indicated on the scrolling marquee by the LED next to each mode listed on the face of the display.

When a specific mode or sub-mode is located, push the ENTER key to enter the mode. Depending on the mode, there

may be additional tiers. Continue to use the and keys and the ENTER keys until the desired display item is found. At any time, the user can move back a mode level by pressing the ESCAPE key. Once an item has been selected the display will flash showing the item, followed by the item value and then followed by the item units (if any).

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Fig. 2 — Accessory Navigator Display

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