Temperature Control During Ice Build
During ice build, the ca pac i ty control algorithm uses t he WATER/BRINE CONTR OL POINT
minus 5 F (2.7 C) to control the LEAVING CHILLED WATER temperature. The ECW OPTION
and any temperature res et option are ignored duri ng ic e build. The 20 mA DEMAND LIMI T
OPTION is also ignored dur i ng ice build.
Termination Of Ice Build
Ice build termination oc c u rs under the following con ditions:
1. Ice Build Time Sched ule — When the Ice Build Time Sche dule transitions to
UNOCCUPIED, ice bu ild operation shall termina te .
2. ECW TEMPERATURE —Termination of compressor operation, based on temperature,
shall occur if the ICE BUILD TERMINATION is set to the ICE BUILD TERMINATION TEMP
option and the ENTERI NG CHILLED WATER temperatur e is less than the ICE BUILD
SETPOINT. If the ICE BUILD RECYCLE OPTION is set to ENABLE, a recycle shutdown
occurs and recycle start-up shall be based on LEAVING CHILLED WATER temperature
being greater than the WATER/BRINE CONTROL POI NT plus RECYCLE DELTA T.
3. Remote Contacts/I c e Lev e l Input —Termination of co m pr es s o r operation occurs when I CE
BUILD TERMINATION is set to CONTACTS ONLY OPTION and the remote contacts are
open. In this case, the co nt acts are provided for ice lev el termination control . The remote
contacts can still be opened and close d to start and stop the chiller when the Ic e Build Time