York Millennium YCAS 310, Установка, эксплуатация и обслуживание

Страница: 98 / 124

YORK INTERNATIONAL
98
7. CLOCK KEYS
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 auto-
matic schedule feature is provided for starting and stop-
ping the chiller on individual days of the week, eliminat-
ing 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 Over-
ride 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 o’clock, 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. 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 us-
ing 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 !
28164(b)A
“CLOCK”
KEYS