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GP Series Portable Chillers Chapter 4: Operation 42 of 90
Variable Description
Access Level
Operator
Supervisor
Chil Hi Temp Dly
Time (in seconds) Chilled High Temperature alarm
is ignored before activating
x
Hi Temp Flt Type
When set to CRIT, chiller and process high temp
alarms will deactivate compressors and pumps.
When set to WARN, compressors and pumps are
allowed to continue to operate when a high temp
alarm occurs
x
Chil Lo T Wrn Dif
Temperature difference below the chiller setpoint
before the chiller low temp warning alarm occurs
x
Chil Lo T Flt Dif
Temperature difference below the chiller setpoint
before the chiller low temp fault alarm occurs.
x
Comp, Lead Cmp On Delay
Temperature Difference between Leaving Fluid
Temperature and Setpoint to turn on the compressor
x
Comp, Lead Cmp Off
Delay
Temperature Difference between Leaving Fluid
Temperature and Setpoint to turn off the compressor
x
Lag Cmp On Dly
Time (in minutes) before lag compressor is
energized once Chilled fluid reaches 2°F (1.1°C)
above Chilled Fluid setpoint
x
Lag Cmp Off Dly
Time (in minutes) before lag compressor is de-
energized once chilled fluid reaches 2°F (1.1°C)
below Chilled Fluid setpoint
x
Cond Fan Start Discharge pressure which energizes condenser fan x
Cond Fan Stop
Discharge pressure which de-energizes condenser
fan
x
Pump Stop Delay
Delay time in seconds between fault and stopping
the pump
x
Heater On Delay
Time (in seconds) before the heater is allowed to
activate once the last compressor stages off
x
Heater Cycle Tm
Time (in seconds) between sampling the output of
the heater’s PID loop. For example, if this variable
is set to ten (10), the heater PID loop output is
checked every ten seconds. If the heater PID loop
output is 70% when sampled the heater output will
be on for 7 seconds and off for 3 seconds.
x
Heater P P parameter of the heater PID loop
x
Heater I I parameter of the heater PID loop
x
Heater D D parameter of the heater PID loop
x
Cooling Valve P P parameter of the cooling valve PID loop
x
Cooling Valve I I parameter of the cooling valve PID loop
x
Cooling Valve D D parameter of the cooling valve PID loop
x
Cooling Valve Mode
When in AUTO, the cooling valve is controlled by
the cooling valve PID loop. When in MANUAL,
the cooling valve is forced open to the percent
dictated by the Cooling Valve Pos variable.
x
Cooling Valve Pos
When the Cooling Valve Mode is set to MANUAL,
this variable dictates what percentage the valve is
forced to.
x
Tank Min Lvl
Minimum tank level. Used to set the default low
tank lefvel alarm setpoints as well as the auto-water
makeup on setpoint.
x