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 following status message will be observed:
M A N U A L
O V E R R I D E
FORM
If a Warning – Low Battery fault message appears on the display, the internal clock, calendar, and pro- gram settings cannot be relied on for accuracy. Default values are loaded into the microprocessor memory and the Manual Override key can be used to zero out the daily schedule and al- low 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 disappear. 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.
8
YORK INTERNATIONAL | 165 |
