Communications - York YLAA0041 Installation Operation & Maintenance

Form 150.72-ICOM6
Issue date: 12/19/2023
• 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 allow hard copy print-
outs using a separate printer (by others).
Entry keys
This section is used to enter setpoints or modify system
values.
Setpoints Keys
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 keys
This section is used to:
• Set time
• Set unit options
Oper data key
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 Johnson Controls
BAS DDC or Building Automation System (by
others) using a 4 mA to 20 mA or 0 VDC to 10
Johnson Controls
Section 1: General chiller information and safety
VDC input
• 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
• 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 and
two steps of demand load limiting from an external
building automation system. Unit alarm contacts are
standard.
The operating program is stored in non-volatile memo-
ry battery backed RAM to eliminate chiller failure due
to AC powered failure/battery discharge. Programmed
setpoints 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 Gateway option.
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