Operation
G20 Glycol Chiller | Operation
Temperature Adjustment | Reservoir
The temperature of the reservoir is controlled by the STC-1000 controller at the rear of the G20.
Setting the reservoir temperature:
Locate the STC-1000 Temperature Controller
Hold the ‘S’ button until F1 is displayed
Press ‘S’ again which will enter temperature adjustment mode
Then hold ‘S’ and up or down buttons simultaneously to adjust the set point temperature of the reservoir
Once the desired temperature has been entered, press and release the
power key to
save the parameter
Set the temperature on the temperature controller for the reservoir to between -2° and -6°C if using glycol.
Do not set this to a temperature lower than recommended according to this table. If you are only using water in the reservoir and not glycol then do not set the temperature of the reservoir to below 2°C
NOTE: Refer here for the full STC-1000 Instruction manual
For fermentation control, a glycol mix is greatly preferred as the cooling power of the G20 will be much higher than if used wit water alone. This is because the glycol lowers the freezing point so the reservoir can be set to -5°C or lower (depending on ambient, the water/glycol mix and other factors)
IMPORTANT: If you are only using water in the reservoir and not glycol then do not set the temperature of the reservoir below 2°C
Set Point Temperature | Fermentation Control
The G20.1 includes temperature controllers on the front of the G20 which controls the switching on and off of the submersible pumps and can also be wired to control an external heating source.
To maintain the desired fermentation temperature, set the front controller(s) connected to the fermenter cooling coil or jacket to the desired set point temperature. Ensure the temperature probe for that controller is in a thermowell for the correct fermenter, or taped to the outside of the fermenter and insulated.
To adjust the parameters of the temperature controllers on the front of the G20 follow these steps
Operation | Front Controllers
Cooling/Heating Indicators
The Cool Indicator flashes during startup delay
The Cool Indicator illuminates when cooling is active
The Heat Indicator* flashes during startup delay
The Heat Indicator* illuminates when heating is active
Heating is not installed in the Glycol Chiller. The heating relay can be optionally connected to a heating device
Turn Controller On or Off
Hold the Down button for 3 seconds to turn the controller on or off
Display Set Point Temperature
Hold the Up button for 3 seconds to display the current Set Point Temperature
Adjust the Set Point Temperature
The Set Point Temperature can be adjusted whether the controller is On or Off
Hold the ‘Up’ button for 3 seconds until the number on the display starts flashing (this number is the current set point temperature)
Press the ‘Down’ button to decrease the set temperature or press the ‘Up’ button to increase the set temperature
Once the correct Set Point Temperature is reached, release the buttons and the temperature will be saved once the display stops flashing. If the controller was off when this procedure started it will also turn off.
Cancel Alarm
If the unit emits an alarm, press any key to cancel the alarm
Parameter Adjustment
Hold the “Up” and “Down” buttons simultaneously for 3 seconds. The first menu code FO will appear on the display
Press the “Up” or “Down” buttons to cycle through the parameters F0-F13
Press both the “Up” and “Down” buttons simultaneously to alter the parameter which appears on the display
Press the “Up” or “Down” buttons to change the set value of the parameter selected
If there is no key operation within 5 seconds then the parameter will be set with the displayed value.
The parameters which can be modified are outlined below
Parameters
F0
SetPoint range
-40.0 - 90.0
10.0
°C
F1
Minimum value for Set Point
-40.0 - F0
-40.0
°C
F2
Maximum value for Set Point
F0 - 90.0
90.0
°C
F3
Cooling Hysteresis
0.1 - 10.0
0.5
°C
F4
Heating Hysteresis
0.1 - 10.0
0.5
°C
F5
Temperature Probe Calibration
-10.0 - 10.0
0
°C
F6
Cooling Start Delay
1.0 - 10.0
1
Minute
F7
Cooling Start Delay after Power Failure
0 - 300
10
Second
F8
Heating Start Delay
1 - 10.0
1
Minute
F9
Heating Start Delay after Power Failure
0 - 300
10
Second
F10
Max temperature before alarm activation
F11 - 99.9
90.0
°C
F11
Min temperature before alarm activation
-45.0 - F10
-40.0
°C
F12
Alarm Delay
1 - 120
1
Minute
F13
Toggle Celsius/Fahrenheit
0-1
F
N/A
To change any settings on the rear STC-1000 Temperature Controller please refer here for the full STC-1000 Instruction manual
Maintenance
If the glycol solution has been stored for an extended period of time then it is suggested to replace the solution, despite glycol having antimicrobial properties.
To replace the glycol empty the reservoir using the drainage port and then refill with the required concentration of glycol using a refractometer to confirm the concentration.
NOTE: It is recommended to drain and replace the gylcol solution every 12 months to avoid freezing issues, as glycol can break down and lose effectiveness over time
Clean out dust from the radiator periodically to maintain optimum efficiency
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