6.7
ISN Control Panel (Standard YCAA models 170 -
210, optional YCAA models 60 - 150)
The panel shall contain:
l
A 40 character Liquid Crystal Display (LCD) with Light
l
Emitting Diode (LED) back lighting for outdoor
viewing.
l
A Colour coded 12-button keypad.
l
Customer terminal block for control inputs and liquid
flow switch.
The microprocessor control will include:
Status Key for display of:
l
Status of the unit and each refrigerant circuit
l
System and unit safety fault messages
Display/Print Keys for display of:
l
Chilled liquid and ambient air temperatures
l
System pressures (each circuit)
l
Operating hours and starts (each compressor)
l
Load and unload timers and cooling demand
l
Liquid pump, evaporator heater and condenser fan
status
Print calls up to the liquid crystal display:
l
Operating data for the systems
l
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 via a
separate printer.
Entry Keys
l
To program and modify system values
Setpoints Keys for programming:
l
Chilled liquid temperature setpoint and range
l
Remote reset temperature range
l
Set daily schedule/holiday for start/stop
l
Manual override for servicing
l
Cut-outs for low ambient temperature, low liquid
temperature, high discharge pressure and low
suction pressure
l
Number of compressors and anti-recycle timer
(compressor start cycle time)
Unit Keys
l
To set time and unit options
Unit ON/OFF switch
l
To activate or deactivate the unit
The microprocessor control system is capable of
displaying the following:
l
Return and leaving liquid temperature
l
Low leaving liquid temperature cutout setting
l
Low ambient temperature cutout setting
l
Ambient air temperature
l
Metric or Imperial data
l
Discharge and suction pressure cutout settings
l
System suction pressures
l
System discharge pressures
l
Anti-recycle timer status
l
Anti-coincident system start timer condition
l
Compressor run status
l
No cooling load condition
l
Day, date and time
l
Daily start/stop times
l
Holiday status
l
Automatic or manual system lead/lag control
l
Lead system definition
l
Compressor starts & operating hours (each
compressor)
l
Evaporator heater and fan operation
l
Run permissive status
l
Number of compressors running
l
Load & unload timer status
l
Water pump status
l
Liquid Temperature Reset via a YORK ISN DDC or
Building Automation System (by others)
Provision shall be included for optional remote
chilled/hot liquid temperature reset.
(09/03)
6
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4
035B09012-100 Rev. 4
Summary of Contents for YCAA B 120
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