Manual Override Key - York eco2 YCAS0425EB Installation Operation & Maintenance

Micro Panel Contents
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 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 the follow-
ing status message will be observed:
M A N U A L
O V E R R I D E
138
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. Repro-
gramming of the setpoints and cutout
values may also be necessary. When
the MANUAL OVERRIDE key is
pressed the low battery message will dis-
appear. If a power failure should again
occur, the above process will again need
to be repeated to bring the chiller back
on line. See also Section 2.5.
YORK INTERNATIONAL