21
JOHNSON CONTROLS
SECTION 2 – PRODUCT DESCRIPTION
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
2
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
•
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.
Summary of Contents for YCAL0019
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