Setup & Operation

KL50555 RAPT Bluetooth Glycol Chiller | Setup & Operation

Filling the reservoir

The RAPT Bluetooth Glycol Chiller can be operated with either just water in the reservoir or both water and glycol to reduce the freezing point of water.

For fermentation control, a glycol mix is greatly preferred as the cooling power of the RAPT Bluetooth Glycol Chiller will be much higher than if used with 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

Fill the reservoir to the indicated level with water or a water/glycol mix. The RAPT Bluetooth Glycol Chiller holds approximately 5.75L when filled to capacity

if the reservoir is filled with water set the reservoir temperature controller to 2°C. If using glycol solution the reservoir temperature can be set below 2°C according to the table below.

Ensure the cooling coils are submerged. The amount of glycol required to be added to the reservoir depends on the desired set temperature of the reservoir which is dependent on a number of factors including how many fermenters are being cooled, the ambient temperature the fermenters are in and heat ingress etc. Use the table below to determine what percentage of glycol you require.

Once the system is operational, top up the reservoir as required to account for the coolant used in the system (lines, cooling jacket etc)

Draining the reservoir

Underneath the reservoir near the front of the RAPT Bluetooth Glycol Chiller is a drain port./ This is sealed with a bung.

To drain the reservoir, position a suitable vessel underneath the drain port and carefully remove the bung.

Do not attempt to empty the RAPT Bluetooth Glycol Chiller by inverting it. This can cause oil to migrate from the compressor or liquid ingress into electronic components. This will void warranty and potentially damage the RAPT Bluetooth Glycol Chiller.

Setting Reservoir Temperature

The reservoir temperature can be controlled directly (using the touch screen on the RAPT Bluetooth Glycol Chiller. It can also be controlled remotely by Bluetooth through the RAPT app.

Direct Control

Power Button

Up Button

Down Button

Cooling Indicator

Temperature Display

SET Button

1. Turn the unit on using power button (Hold the power button to turn the unit off)

2. Select . The display will flash to indicate Set Point Mode

3. Using the Up or Down buttons, change the displayed temperature to the desired Set Point Temperature

4. Once the desired Set Point Temperature is displayed, wait 5 seconds. The display will stop flashing and the new Set Point will be saved

Once the Set Point Temperature has been set, operation is automatic. If the measured temperature of the reservoir is above the Set Point Temperature, the compressor will start and the reservoir will cool until the Set Point Temperature is reached.

Refer to the Glycol Percentage Chart below for recommended Set Point Temperatures with corresponding glycol percentage

Bluetooth Operation

To connect and control the RAPT Bluetooth Glycol Chiller by Bluetooth, you will need to download and install the RAPT Brew App for Android or IOS

RAPT Brew App on the App Store

RAPT Brew App on the Google Play Store

Once the RAPT Brew App has been installed, follow the on screen prompts to create an account (if required).

To connect to the RAPT Bluetooth Glycol Chiller, in the RAPT Brew App navigate to Add Device and select Bluetooth Glycol Chiller

Ensure the RAPT Bluetooth Glycol Chiller is turned on. Wait until the RAPT Bluetooth Glycol Chiller appears in the Device Registration screen (The device name is in the form RAPT_GCXXX)

Select the correct RAPT Bluetooth Glycol Chiller and select Connect. Input the desired Device Name and select Register

Once connected and registered, the Rapt Bluetooth Glycol Chiller can be controlled directly through the RAPT Brew App provided it is within Bluetooth range. Swipe up from the Device screen to bring up the controls. Select the desired temperature and remember to select Apply to save the new temerpature setting

Refer to the Glycol Percentage Chart below for recommended Set Point Temperatures with corresponding glycol percentage

Convert Units from Celsius to Fahrenheit (optional)

To convert the units from Celsius to Fahrenheit (if desired) press the Button twice. The current Unit selection will flash. Select Up or Down buttons to change from one unit to the next. Once selected, wait 5 seconds for the display to stop flashing. The new unit will be saved.

Glycol Percentage Chart

Glycol Volume %	Freezing Point (°C)	Specific Gravity at 20°
0	0.0°C	1.000
10	-3.3°C	1.006
20	-7.8°C	1.015
30	-13.3°C	1.024

You can measure the glycol percentage using a calibrated refractometer and comparing to the specific gravity at 21°C in the above table.

We would advise running a 20% glycol solution. However, if you do not have a jacketed fermenter or have the fermenter in a very warm environment you can run it at a higher glycol concentration. The pumps are not designed to be run with a glycol concentration higher than 30% hence it is not advised to exceed this glycol concentration. Doing so may damage the pumps.