York YCAL0065, YCAL0041 manual Millennium Control Center, Unit ON/OFF switch

FORM 150.64-EG1

MILLENNIUM CONTROL CENTER

All controls are contained in a NEMA 3R/12 (and equivalent to IP55*) cabinet with hinged outer door and includes:

Liquid Crystal Display with Light Emitting Diode back- lighting for outdoor viewing:

Two display lines

Twenty characters per line

Color coded 12-button non-tactile keypad with sections for:

DISPLAY/PRINT of typical information: Chilled liquid temperatures Ambient temperature

System pressures (each circuit)

Operating hours and starts (each compressor) Print calls up to the liquid crystal display: Operating data for the systems

History of fault shutdown data for up to the last six fault shutdown conditions An RS-232 port, in conjunction with this press-to-print button, is provided to permit the capability of hard copy print-outs via a separate printer (by others).

ENTRY section to:

ENTER setpoints or modify system values

SETPOINTS updating can be performed to: Chilled liquid temperature setpoint and range Remote reset temperature range

Set daily schedule/holiday for start/stop Manual override for servicing

Low and high ambient cutouts Number of compressors Low liquid temperature cutout Low suction pressure cutout High discharge pressure cutout

Anti-recycle timer (compressor start cycle time)

Anti-coincident timer (delay compressor starts)

UNIT section to: Set time

Set unit options

UNIT ON/OFF switch

The microprocessor control center is capable of dis- playing the following:

•Return and leaving liquid temperature

•Low leaving liquid temperature cutout setting

•Low ambient temperature cutout setting

•Outdoor air temperature

•English or Metric data

•Suction pressure cutout setting

•Each system suction pressure

•Discharge pressure (optional)

•Liquid Temperature Reset via a YORK ISN DDC or Building Automation System (by others) via:

-a pulse width modulated (PWM) input as stan- dard

-a 4-20 milliamp or 0 -10 VDC input, or contact closure with the optional B.A.S. interface option

•Anti-recycle timer status for each system

•Anti-coincident system start timer condition

•Compressor run status

•No cooling load condition

•Day, date and time

•Daily start/stop times

•Holiday status

•Automatic or manual system lead/lag control

•Lead system definition

•Compressor starts & operating hours (each compressor)

•Status of hot gas valves, evaporator heater and fan operation

•Run permissive status

•Number of compressors running

•Liquid solenoid valve status

•Load & unload timer status

•Water pump status

*Intensity of Protection European Standard

YORK INTERNATIONAL 5