Manual Override Key - York MILLENNIUM YCAR0315 Installation Operation & Maintenance

If an error is made while programming the holidays or a
change is required, press Cancel. This will clear all pro-
grammed (*) "Holidays".

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 servicing when the
chiller is required to run but the Daily Schedule is in an
OFF period. This key avoids the need to reprogram the
Daily Schedule. Once activated, Manual Override is only
active for a period of 30 minutes and will automatically
disengage after 30 minutes. The following status mes-
sage will be observed when in the Manual Override
Mode:
M A N U A L
O V E R R I D E
YORK INTERNATIONAL
FORM 150.52-NM2 (1001)
If a "Warning – Low Battery" fault
message appears on the display the in-
ternal 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. Reprogram-
ming of the setpoints and cutout val-
ues may also be necessary. When the
MANUAL OVERRIDE key is pressed,
the low battery message will disappear.
If a power failure should again occur,
the above process will need to be re-
peated to bring the chiller back on line.
See also Section 9 (2.5).
9
141