York Millennium YCAJ150, Installation Operation & Maintenance, Page: 47 / 116

FORM 150.65-NM4
47 YORK INTERNATIONAL
GENERAL
The “CLOCK” is an internal system feature that allows
the microprocessor to continuously monitor the time of
the day. The micro will display actual time as well as the
day of the week and the date when programmed. This
feature allows the microprocessor to provide an internal
automatic time clock feature for starting and stopping
the chiller for each individual day of the week. Also pro-
vided is a “HOLIDAY” feature which allows special start/
stop programming for designated holidays.
The internal clock and schedule programming eliminates
the need for an external time clock. Automatic chiller
start and stop will occur according to the programmed
schedule.
If the user desires not to utilize the schedule feature, the
SET SCHEDULE/HOLIDAY can be programmed to run
the chiller on demand as long as the “UNIT” and “SYS”
switches are ON.
Typical display messages will be shown which apply to
each key.
PROGRAMMING THE DAY, TIME AND THE DATE
Set Time
A message showing the day, time and date will be dis-
played when the SET TIME key is pressed.
To program the day, time and date, first press the AD-
VANCE DAY key until the appropriate day of the week is
displayed. The day will advance each time the key is
pressed.
The cursor will already be below the first digit of the time.
Key in the new time, if required. Be sure to key in a “0”
before the other digits for times before 10 o’clock., i.e.
08:01.
After the time is keyed in, the cursor will advance to the
AM/PM designation. To reprogram, press the AM/PM
key. When the key is pressed, the display will change
to the opposite time period. If no change is required,
begin keying in the required date (the cursor will auto-
matically skip to the first digit of the date [month] when
a “number key” is pressed and the number will be placed
in the first position).
NOTE: The AM/PM key can only be pressed once. If
an error is made, press the CANCEL key and
begin again.
The date may be keyed in after AM/PM. The sequence
of the message display is month, day and year. Two
digits must be entered for each of these items. There-
fore, a leading “0” may be required.
Once the desired information is keyed in, it may be stored
in memory by pressing the ENTER key. After the EN-
TER key is pressed, the cursor will move under the “T” of
TODAY.
The micro will accept any valid time or date. If an out of
range value is entered, the micro will display the follow-
Photo #
“CLOCK” KEYS
PROGRAMMING THE SYSTEM CLOCK AND DAILY START/STOP SCHEDULE
“CLOCK”
KEYS
SET
TIME
T O D A Y I S S U N 1 1 : 1 2 A M
0 6 / 0 3 / 9 8
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