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Micropanel
When the '*' key is pressed, the cursor will advance to
the next day. Use the ' ' or ' ' keys to move back
and forth among days.
After all the holiday days are programmed, press 'EN-
TER' to store the new data. The display will then re-
turn to the beginning of the 'DAILY SCHEDULE'.
The 'HOLIDAY SCHEDULE' is only
performed once, then erased from
memory. This avoids the need for re-
programming after the holiday, as most
special 'HOLIDAY SCHEDULE' re-
quirements occur only occasionally.
If an error is made while programming or a change is
required, press 'CANCEL'. This will clear the pro-
grammed (*) holiday days (the '0' key will not cancel
out a '*' and cannot be used for correcting a program-
ming error).
8.4 MANUAL OVERRIDE KEY
When the 'MANUAL OVERRIDE' key is pressed, the
'DAILY SCHEDULE' programmed into the chiller is
ignored and the chiller will start up when water tem-
perature is above the high limit of the control range,
the Chiller 'ON/OFF' switch is 'ON', remote cycling
devices are closed, and system switches permit.
68
Normally this key is only used for servicing when the
chiller is required to run but the 'DAILY SCHEDULE'
is in an 'OFF' period. This key avoids the need to re-
program the 'DAILY SCHEDULE'. Once activated,
manual override is only active for a period of 30 min-
utes and the following status message will be displayed:
M A N U A L
O V E R R I D E
If a 'LOW BATTERY WARNING'
message appears on the display the
internal clock, calendar and program
settings cannot be relied on for accu-
racy. Default values are loaded into
the microprocessor memory and the
'MANUAL OVERRIDE' key can be
used to zero out the daily schedule and
allow unlimited operation regardless
of the time on the internal clock.
Reprogramming of the setpoints and
cutout values may also be necessary.
When the 'MANUAL OVERRIDE'
key is pressed the low battery message
will disappear. If a power failure oc-
curs, the above process will again need
to be repeated to bring the chiller back
on line.
FORM 201.25-NM1 (302)
YORK INTERNATIONAL
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