Trane R Series Installation Operation & Maintenance page 68

Installation - Electrical
Ice Making Option
Ice Machine Control (Operator Setting Menu) must be Enabled. The UCM
provides auxiliary control for a customer specified/installed contact closure
for ice making. When contact (5K20) is provided, the chiller will run normally
when the contact is open. Upon contact closure, the UCM will initiate an ice-
building mode, in which the unit runs fully loaded at all times. Ice-building
shall be terminated either by opening the contact or based on the entering
evaporator water temperature setting under Active Ice Termination Setting
(Chiller Report Menu). The UCM will not permit the ice-building mode to be
reentered until the unit has been switched out of ice-building mode (open
5K20 contacts) and then switched back into ice-building mode (close 5K20
contacts). In ice-building, the current setpoint will be set at 120%. For
example, if the Front Panel or External Current Limit setpoint is set to 80%, in
icebuilding the Active Current Limit is 120%.
If, while in ice-building mode, the unit gets down to the freezestat setting
(water or refrigerant), the unit will shut down on a manually resettable
diagnostic, just as in normal operation.
68 RLC-SVX07A-EN