or standby chiller for lead/lag and is actively controlled by a lead chiller. The lead chiller
communicates the ICE BUILD SETPOINT, desired CHILLER START/STOP state, and
ACTIVE DEMAND LIMIT to the lag or standby chiller as required for ice build, if config-
ured to do so.
Start-Up/Recycle Operation
If the machine is not running when ice build activates, then the PIC checks the following
parameters, based on the ICE BUILD TERMINATION value, to avoid starting the compressor
unnecessarily:
• if ICE BUILD TERMINATION is set to the TEMPERATURE ONLY OPTION and the
ENTERING CHILLED WATER temperature is less than or equal to the ICE BUILD
SETPOINT;
• if ICE BUILD TERMINATION is set to the CONTACTS ONLY OPTION and the
remote contacts are open;
• if the ICE BUILD TERMINATION is set to the BOTH (temperature and contacts)
option and ENTERING CHILLED WATER temperature is less than or equal to the
ICE BUILD SETPOINT and remote contacts are open.
The ICE BUILD RECYCLE OPTION determines whether or not the PIC will go into a
RECYCLE mode. If the ICE BUILD RECYCLE OPTION is set to DSABLE (disable) when the
ice build terminates, the PIC will revert back to normal temperature control duty. If the ICE
BUILD RECYCLE OPTION is set to ENABLE, when ice build terminates, the PIC will go into an
ICE BUILD RECYCLE mode and the chilled water pump relay will remain energized to keep the
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