The chiller also maintai ns a start-to-start ti mer and a stop-to-start t im er . These timers limit
how soon the machine can be s t arted. See the Start-Up/Shutdown/Recycle Sequence section
for operational information.
Occupancy Schedule
This schedule determin es when the chiller is eithe r occupied or unoccup ied .
Each schedule consi s ts of from one to 8 occupied/unoc c u pied time periods, set b y the
operator. These time per io ds can be enabled to be in effec t, or not in effect, on each day of the
week and for holidays. T he day begins with 0000 hour s and ends with 2400 hours. The machine
is in OCCUPIED mode unless an unoccupied time peri od is in effect.
The machine will shut do wn whe n the schedule goes to UNO CC UPIED. These schedule s
can be set up to follow the bu ild ing schedule or to be 100% O CCUPIED if the operator wi shes.
The schedules also can be by pa ssed by forcing the Sta r t/ S t op command on the PIC Stat us
screen to start. The sche dules also can be overridd en to keep the unit in an OCC UP I ED mode
for up to 4 hours, on a one-tim e ba sis.
Figure 19 shows a schedule for a typical office buildi ng time schedule, with a 3- hour, off-peak
cool down perio d from midnight to 3 a.m., f ollowing a weeke nd shutdown. E xample: Holiday
periods are unoccupie d 24 hours per day. The build ing operates Monday thro ugh Friday, 7:00
a.m. to 6:00 p.m. , with a Saturday s chedule of 6:00 a.m. to 1:00 p.m. , and includes the Monday
midnight to 3:00 a.m. week e nd cool-down schedul e.