5
Red Status Indicator —
A steady light indicates that at
least one indoor unit is operating, or that the central controller
is sending a command to one or more indoor units. A slowly
flashing light indicates an indoor unit error or a communication
error. When the status indicator is off, no connected indoor unit
is operating.
Backlight —
Press any button except RESET to backlight
the display. The backlight remains on while the central control-
ler is being operated. It goes off automatically after 30 seconds
of inactivity.
Power On or Reset Signal —
When the central con-
troller is powered on or reset, the controller beeps for 2 seconds
and the display screen lights. The controller then transmits a
signal to (queries) the indoor units, and the screen shows the
main display. The mode setting screen is then displayed.
Indoor Unit Address Display —
Indoor unit ad-
dresses are displayed in a grid that indicates the status of each
unit. The display range is 00 to 63 (64 indoor units maximum).
The grid is composed of 64 boxes, each representing one in-
door unit. The grid’s vertical coordinates are 00+, 16+, 32+,
and 48+. The grid’s horizontal coordinates are 00 to 15. The
sum of the vertical and horizontal coordinates is the address of
the indoor unit. (The unit’s location on the grid has no relation
to the unit’s physical location.) For example, the address of the
unit with the coordinates 48+,11 is 59. See Fig. 8.
Each indoor unit’s box in the grid contains 2 display blocks,
one large and one small. These signal the unit’s status as
shown below:
Figure 9 shows an example display on the main display screen.
In this example 60 indoor units are in service. Twenty-eight are
on, and 32 are off.
• In the grid, the large blocks for the units from 16+,00 to
32+,15 are lit, and the small blocks are dim. This means
that the 32 units with addresses from 16 to 47 are con-
nected but powered off.
• Both the large and small blocks for the units from 48+,09
to 48+,12 are not lit. This means that the four indoor
units with addresses from 57 to 60 are not connected.
• All the other large and small blocks in the grid are lit.
This means that all the other indoor units are connected
and powered on.
BLOCK
LIGHT SIGNAL
STEADILY
LIT
SLOW
BLINK
FAST
BLINK
DIM
(NOT LIT)
Large
Connected
Selected
—
Out of ser-
vice
Small
Power On
—
Error
Power Off
00+
16+
32+
48+
00 01 02
06 07 08
03 04 05
09 10 11 12 13 14 15
a30-1885
Fig. 8 — Indoor Unit Address Grid
a40-1886
Fig. 9 — Main Display Screen Example
