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FORM 201.24-NM2
71
YORK INTERNATIONAL
8.1 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 are a
holiday feature, allowing special start/stop times to be
set for designated holidays, and a manual override fea-
ture to aid servicing.
If the automatic schedule feature is not required, the
microprocessor 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.
8.2 SET TIME/DATE KEY
When the ‘SET TIME/DATE’ key is pressed, a mes-
sage showing the day, time and date will be displayed
with the cursor below the first digit of the time as
shown:
First press the ‘
á
’ or ‘
â
’ key until the correct day
appears.
Press ‘ENTER’ to move to the hour part of the display.
Next, key in the time (hours/minutes) using a leading
‘0’ for times before 10 o’clock. e.g. 08:31.
The cursor will then advance to the ‘AM/PM’ designa-
tion. If necessary press the ‘
á
’ or ‘
â
’ 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 ‘
á
’ or ‘
â
’ key until the correct 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/DATE’ display message for reprogramming.
Pressing the ‘SET TIME/DATE’ key
once enters the ‘programming’ mode
in which the displayed time does not
update. Pressing the ‘SET TIME/
DATE’ key a second time enters ‘dis-
play’ mode in which the cursor will
disappear and the ‘live’ clock will be
displayed.
29023A
8. CLOCK KEYS
T O D A Y I S M O N 1 1 . 1 2 A M
1 9 F E B 1 9 9 9
O U T O F R A N G E -
T R Y A G A I N !
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