Carrier 48PG24 Controls, Start-Up, Operation, Service And Troubleshooting Instructions Download Page 3

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Scrolling Marquee —

This device is the keypad 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 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 Sta-

tus LED. See Fig. 1. The display is easy to operate using 4 but-

tons and a group of 11 LEDs that indicate the following menu

structures:
• 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, con-

figure 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 with the unit.

Accessory Navigator™ Display —

The accessory

hand-held Navigator display can be used with the 48/50PG

units. See Fig. 2. The Navigator display operates the same way

as the Scrolling Marquee device. The Navigator display is

plugged into the LEN port on either TB2 or the ECB board.

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

Comfort

Link™ control

also supports the use of the handheld Navigator display.

Both displays provide the user with an interface to the

Comfort

Link control system. The displays have

and

arrow keys, an

key and an

key. These

keys are used to navigate through the different levels of the dis-
play structure. The Navigator and the Scrolling Marquee oper-
ate 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

key until a blank display is shown. Then

use the

and

arrow keys to scroll through the top-level

categories. These are listed in Appendix A and will be indicat-
ed 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

key to enter the mode. Depending on the mode, there

may be additional tiers. Continue to use the

and

keys

and the

keys until the desired display item is found.

At any time, the user can move back a mode level by pressing
the

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).

Items in the Configuration and Service Test modes are

password protected. The display will flash PASS and WORD
when required. Use the

and arrow keys to enter the

four digits of the password. The default password is 1111.

Pressing the

and

keys simultaneously

will scroll an expanded text description across the display indi-
cating the full meaning of each display point. Pressing the

and

keys when the display is blank

(MODE LED level) will return the display to its default menu
of rotating AUTO VIEW display items. In addition, the pass-
word will need to be entered again before changes can be made.

Changing item values or testing outputs is accomplished in

the same manner. Locate and display the desired item. If the
display is in rotating auto-view, press the

key to stop

the display at the desired item. Press the

key again so

that the item value flashes. Use the arrow keys to change the
value of state of an item and press the

key to accept

it. Press the

key and the item, value or units display

will resume. Repeat the process as required for other items.

Depending on the unit model, factory-installed options and

field-installed accessories, some of the items in the various