# Operation
### Temperature Adjustment | Reservoir
The temperature of the reservoir is controlled by the STC-1000 controller at the rear of the G40.
#### Setting the reservoir temperature:
1. Locate the **STC-1000 Temperature Controller**
2. Hold the **S Button** until **F1** is displayed
3. Press **S Button** again which will enter temperature adjustment mode
4. Then hold the **S Button** *and* **Up** or **Down** **buttons** simultaneously to adjust the set point temperature of the
reservoir
5. 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](https://docs.kegland.com.au/products/cooling-equipment/initial-startup-and-testing#glycol-percentage-chart). 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**](https://www.kegland.com.au/media/pdf/stc1000%20instructions.pdf)
**For fermentation control, a glycol mix is greatly preferred as the cooling power of the G40 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 G40 includes temperature controllers on the front of the G40 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 G40 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](https://docs.kegland.com.au/products/cooling-equipment/fermentation-glycol-chiller-with-digital-control-or-4-pump-model-or-g40-or-user-guide/heating-relay-instructions)
#### 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** T**emperature**
#### Adjust the Set Point Temperature
1. The **Set Point Temperature** can be adjusted whether the controller is On or **Off**
2. Hold the ‘**Up**’ button for 3 seconds until the number on the display starts flashing (this number is the current set point temperature)
3. Press the ‘**Down**’ button to decrease the set temperature or press the ‘**Up**’ button to
\
increase the set temperature
4. 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
1. Hold the “**Up**” and “**Down**” buttons simultaneously for 3 seconds. The first menu code **FO**
\
will appear on the display
2. Press the “**Up**” or “**Down**” buttons to cycle through the parameters **F0**-**F13**
3. Press *both* the “**Up**” and “**Down**” buttons simultaneously to alter the parameter which
\
appears on the display
4. 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
| Parameter | Function | Range | Default | Units |
| --------- | --------------------------------------- | ------------ | ------- | ------ |
| **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**](https://www.kegland.com.au/media/pdf/stc1000%20instructions.pdf)
### 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
or **Down** 
**buttons** simultaneously to adjust the set point temperature of the
reservoir
5. 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](https://docs.kegland.com.au/products/cooling-equipment/initial-startup-and-testing#glycol-percentage-chart). 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**](https://www.kegland.com.au/media/pdf/stc1000%20instructions.pdf)
**For fermentation control, a glycol mix is greatly preferred as the cooling power of the G40 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 G40 includes temperature controllers on the front of the G40 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.
