Sterlco GC Series Central Chiller - Manual (Page 38)

GC Series Central Chillers Chapter 4: Operation 38 of 79
4-4 Access Levels
The controller is setup to allow access to three distinct password groups: operator, supervisor,
and service. Operator access allows the user to modify the Leaving Water Temp, Hi and Low
Temp Warning, Hi and Low Temp Fault setpoints. Supervisor access allows the supervisor to
modify the above plus additional setpoints, installing additional modules, setup
communications, and perform sensor calibration.
Selecting any of the menus in the Menu Screen will display the Password Screen if multiple
passwords were setup. See Section 3-10 for more information.
4-5 Controller Setpoints
Variable Description
Access Level
Operator Supervisor
Chiller/Process SP Temperature of fluid leaving evaporator x x
Chil/Proc Hi Temp Wrn
Setpoint for alarm to warn when leaving fluid
temperature is too high
x x
Chil/Proc Hi Temp Flt
Setpoint to shut down pump and compressor based on
leaving fluid temperature
x x
Chil/Proc Hi Temp Dly
Delay time in minutes between fault and stopping the
compressor and pump
x
Hi Temp Flt Type
Select warning or critical for the desired type of high
temperature fault.
x
Proc Low Temp Wrn
Temperature to activate Low Temperature Warning
alarm
x
Proc Low Temp Flt Temperature to activate Low Temperature Fault alarm x
Cooling Enabled Allows refrigeration circuit to be active x
Heating Enabled Allows process heating to be active x
Fluid Freeze Pt
Minimum temperature of leaving fluid temperature
before fluid freezes
x
Chil On Diff
Temperature Difference between Leaving Fluid
Temperature and Setpoint to turn on the compressor
x
Chil Off Diff
Temperature Difference between Leaving Fluid
Temperature and Setpoint to turn off the compressor
x
Chil Lo T Wrn Diff
Chiller low temperature warning alarm based on a
differential from setpoint.
x
Chil Lo T Flt Diff
Chiller low temperature fault alarm based on a
differential from setpoint.
x
Comp,Lead Cmp On
Delay
Time in minutes before lead compressor can activate x
Comp,Lead Cmp Off
Delay
Time in minutes before lead compressor can deactivate x
Lag Cmp On Dly
Time in minutes after lead compressor activates before
lag compressor can activate
x
Lag Cmp Off Dly
Time in minutes after lead compressor deactivates
before lag compressor can deactivate
x
Cond Fan Start Discharge pressure setting to activate condenser fans x
Cond Fan Stop Discharge pressure setting to deactivate condenser fans x