York YCAS0130, Installation, Operation & Maintenance Manual, Page: 165 / 204

165
YORK INTERNATIONAL
FORM 201.19-NM1 (204)
If an error is made while programming or a change is
required, press Cancel. This will clear the programmed
(*) “Holiday” days (the “0” key will not cancel out a
“ * ” and cannot be used for correcting a programming
error).
7.4 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 temperature 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.
Normally this key is only used for ser vic ing when the
chiller is required to run, but the Daily Sched ule is in
an OFF period. This key avoids the need to reprogram
the Daily Schedule. Once activated, Manual Over ride is
only active for a period of 30 min utes and the fol low ing
sta tus message will be ob served:
M A N U A L
O V E R R I D E
If a Warning – Low Battery fault
mes sage appears on the display, the
in ter nal clock, cal en dar, and pro-
gram set tings cannot be relied on for
accuracy. Default val ues are loaded
into the mi cro pro ces sor mem o ry and
the Man u al Over ride key can be used
to zero out the daily sched ule and al-
low un lim it ed operation re gard less of
the time on the internal clock. Re pro -
gram ming of the setpoints and cut out
values may also be nec es sary. When the
MAN U AL OVER RIDE key is pressed,
the low bat tery mes sage will disappear.
If a power fail ure should again occur,
the above pro cess will again need to be
re peat ed to bring the chill er back on
line. See also Section 2.5.
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