Catalogue

62 RLC-PRC029-EN
Controls
BACnet Communication Interface
BACnet communications capabilities are available, with communication link via single twisted-pair
wiring.
Required features:
• BACnet Interface
Additional options that may be used:
• Ice making
• Chilled water temperature reset - outdoor air
External devices required:
• BACnet MS/TP network.
BACnet Chiller Controls
BACnet is an open standard communications protocol used by building automation systems.
BACNet MS/TP uses RS-485 hardware. This device is a non-programmable communication
module that connections directly to the CH530 chiller control.
Time of Day Scheduling
Time of day scheduling allows the customer to perform simple chiller scheduling without the need
for a building automation system.
This feature allows the user to set 10 events in a 7 day time period. For each event the user can
specify an activation time and the days of the week the event is active. Any setpoints available can
be specified for each event, such as the leaving chilled water temperature (standard) and the
current-limit setpoint (optional if ordered).
Required features:
• Time of day scheduling
Additional options that if ordered may be incorporated into the scheduling:
• External chilled water setpoint
• External current-limit setpoint
• Condenser leaving hot water temperature setpoint
• Ice making initiation
Hardwire Points
Remote devices wired from the control panel are another reliable method of providing auxiliary
control to a building automation system. Inputs and outputs can be communicated via a typical
4–20 mA electrical signal, an equivalent 2–10 Vdc signal, or by utilizing contact closures.
Selectable options:
• External chilled water setpoint/External current-limit setpoint
• Ice making control
• Condenser leaving hot water temperature control
• Chilled water temperature reset
• Condenser pressure output
• Motor current analog output
• Programmable relays available outputs are: alarm-latching, alarm-auto reset, general alarm,
warning, chiller limit mode, compressor running, head pressure relief request, and Tracer
control