COMPRESSOR MOTOR LOAD is less than the lead chiller percent capacity plus 15%. The
timer is ignored if the ch ill ed water temperature re ac he s 3° F (1.67° C) below the
CONTROL POINT and the lead chiller COMPRESSOR MOTOR LOAD value is less than
the lead chiller percen t capacity plus 15%.
Faulted Chiller Operation
If the lead chill er shuts down on a n alarm (*) conditio n, it stops commun ication to the lag a nd
standby chillers. A fter 30 seconds, the la g chiller will now beco me the acting lead chille r and will
start and stop the standby chiller, if necessary.
If the lag chiller faults whe n the lead chiller is also fau lted, the standby chill er r ev er t s to a
stand-alone CCN mode of ope ration.
If the lead chiller is in an alarm (*) condition (as shown on the LID panel), the RESET softkey
is pressed to clear t he alarm, and the chil ler is placed in the C CN mode, the lead chil ler will now
communicate and m onitor the RUN STATUS of the lag and standby chill ers. If both the lag and
standby chillers are running, the lead chiller will not att empt to start and will not assume the role
of lead chiller until either the lag or standb y chiller shuts d own. If only one chiller is runn ing, the
lead chiller will wait for a s t art request from the oper at ing chiller. When the conf ig ured lead
chiller starts, it ass um e s its role as lead chiller.