YORK INTERNATIONAL
110
7. CLOCK KEYS
28164(B)A
7.1 GENERAL
The Microprocessor features a continuously running in-
ternal 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 is a Holi-
day 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 the internal clock / calendar and operat-
ing schedule are described below:
7.2 SET TIME KEY
When the Set Time key is pressed, a message show-
ing the day, time, and date will be displayed with the
cursor below the first digit of the time shown:
First press the Advance Day key until the proper day
appears. Next key in the time (hours/minutes) using a
leading 0 for times before 10 oclock, e.g. 08:31. The
cursor will then advance to the AM/PM designation. If
necessary, press the AM/PM key to change to the op-
posite time period.
NOTE: The AM/PM key can only be used once here. If
an error is made, press the Cancel key and
begin again.
Next, key in the required date of the month (the cursor
will automatically 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
as required. Always use two digits for the day and the
year using a leading 0 for days 1 - 9, e.g. 02 FEB 97.
Finally change the month as needed by repetitively
pressing the +/ 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 data will be accepted. If an out of range
value is entered the following message will be displayed
for three seconds then revert back to the Set Time dis-
play message for reprogramming:
NOTE: Pressing the Set Time key once enters pro-
gramming mode in which the displayed time
does not update. Pressing the Set Time a sec-
ond time enters display mode in which the
cursor will disappear and the live clock will be
displayed.
7.3 SET SCHEDULE / HOLIDAY KEY
Messages giving each week day and the holiday start /
stop schedule, as shown below, can be displayed using
the Set Schedule / Holiday key:
T O D A Y
I S
M O N
1 1 . 1 2 A M
1 9
F E B
9 5
O U T
O F
R A N G E
T R Y
A G A I N !
CLOCK
KEYS
