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7.1
GENERAL
The microprocessor features a continuously running
internal Clock and calendar and can display actual time
as well as the day of the week and the date. An automatic
schedule feature is provided for starting and stopping
the chiller on individual days of the week, eliminating
the need for an external time clock. Also provided are
a Holiday feature, allowing special start/stop times to
be set for designated holidays, and a Manual Override
feature to aid servicing. If the automatic schedule feature
is not required, the micro can be programmed to run the
chiller on demand as long as the Chiller ON/OFF and
System switches are in the ON position.
Programming of the internal clock/calendar and oper-
ating schedule are described below.
7.2
SET TIME KEY
When the Set Time key is pressed, a message showing
the day, time and date will be displayed with the cursor
below the first digit of the time as shown:
T O D A Y
I S
M O N
1 9
F E B
First press the or key until the proper day appears.
Press ENTER to move on to the hour part of the display.
Next, key in the time (hours/minutes) using a leading
JOHNSON CONTROLS
7. CLOCK KEYS
1 1 . 1 2 A M
1 9 9 9
"0" for times before 10 o'clock. e.g. 08:31. The cursor
will then advance to the AM/PM designation. If neces-
sary press the or key to change to the opposite
time period.
Next, key in the day of the month (the cursor will au-
tomatically skip from AM/PM to the first digit of the
date when a "number key" is pressed). The cursor will
then skip to the first digit of the year. Key in the year.
Always use two digits for the day and the year, using a
leading "0" for days 1-9 e.g. 02 FEB 99. Finally, change
the month as needed by repetitively pressing the or
key until the proper month appears. Once the desired
information is keyed in, it must be stored into memory
by pressing the Enter key.
Any valid time or date will be accepted. If an out of
range value is entered, the following message will be
displayed for 3 seconds then revert back to the Set Time
display message for reprogramming:
O U T
O F
R A N G E -
T R Y
A G A I N !
Pressing the Set Time key once enters
the "programming" mode in which
the displayed time does not update.
Pressing the Set Time key a second
time enters "display" mode in which
the cursor will disappear and the "live"
clock will be displayed.
FORM 201.18-NM7
29023A
159
8
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