G40 with 4 x Submersible Pumps Instruction Manual
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www.KegLand.com.au
Last Updated 28/07/2021 3:15 PM
Fill the Reservoir
The G40 can be operated with either just water in the reservoir or both water and glycol to reduce
the freezing point of water.
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 until the copper cooling coils are fully submerged with water if the reservoir is set at
2°C or an appropriate concentration of glycol solution if dropping the reservoir below 2°C according
to the table below. 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 heat
ingress into the entire system, insulation of the glycol lines, ambient temperature, the number of
kegs being cooled and the temperature of the kegs. Use the table below to determine what
percentage of glycol you require.
Glycol Volume %
Freezing Point °C
Specific Gravity at 21°C
0
0.0
1.000
10
-3.3
1.006
20
-7.8
1.015
30
-13.3
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 which will result in around a -8°C freezing point.
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.