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6.1 GENERAL
The entry keys allow the user to change numerical val-
ues during programmed for chiller setpoints, cutouts,
clock, etc.
6.2 NUMERICAL KEYPAD
The numerical keypad provides all keys necessary to
program numerical values into the microprocessor.
The '*' key is used to designate holidays when pro-
gramming special start/stop times for designated holi-
days in the 'SET SCHEDULE/HOLIDAY' program
mode.
The '+/-' key allows programming of negative setpoints
and cutouts.
6.3 ENTER KEY
The 'ENTER' key must be pressed to confirm any change
to setpoints, cutouts, or system clock. Pressing this key
tells the microprocessor to accept new values into
memory. If this is not done, the new values entered will
be lost and the original values will be restored.
YORK INTERNATIONAL
6. ENTRY KEYS
29023a
The 'ENTER' key is also used to scroll through avail-
able data when using the 'PROGRAM' or 'SET
SCHEDULE/HOLIDAY' keys.
6.4 CANCEL KEY
When the 'CANCEL' key is pressed, the cursor will
always return to the first character to be programmed
in the display message. This allows the operator to be-
gin reprogramming, if an error is made. When the
'CANCEL' key is pressed, the values already keyed in
will be erased and the original or internally programmed
default values will appear. In other instances the dis-
play will remain the same and the only reaction will be
the cursor returning to the first character.
6.5
KEYS
The '
' keys allow the user to scroll through data
under the 'OPER DATA' and 'HISTORY' keys and to
select the correct day of the week and the correct month
when programming the microprocessor with the cor-
rect time and date.
The ' ' key also operates as a toggle 'AM/PM' key if
the cursor is over 'AM' or 'PM' on the display. For
example, pressing the ' ' key when the cursor is on
'PM' changes it to 'AM'.
FORM 201.25-NM1 (302)
7
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