Unit On/Off Switch - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017

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
standard.
• a 4 to 20 milliamp or 0 to 10 VDC input 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 and operating hours
(each compressor)
• Status of hot gas valves, evaporator heater and fan
operation
• Run permissive status
* Intensity of Protection European Standard
** International Electrotechnical Commission
JOHNSON CONTROLS
SECTION 2 – PRODUCT DESCRIPTION
• Number of compressors running
• Liquid solenoid valve status
• Load and unload timer status
• Water pump status
Provisions are included for:
• Pumpdown at shutdown.
• Optional remote chilled water temperature reset.
• Two steps of demand load limiting from an exter-
nal building automation system.
Unit alarm contacts are standard.
The operating program is stored in non-volatile mem-
ory (EPROM) to eliminate chiller failure due to AC
powered failure/battery discharge. Programmed set-
points are retained in lithium battery-backed RTC
memory for 5 years minimum.
COMMUNICATIONS
• Native communication capability for BACnet
(MS/TP) and Modbus
• Optional communication available for N2 and
LON via eLink option
POWER PANEL
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per l.E.C.**
• Control power terminals to accept incoming for
115-1-60 control power
• Fan contactors and overload current protection
The power wiring is routed through liquid-tight con-
duit to the compressors and fans.
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