6.11 Gas ballast operation
Gas ballast is operated by a black plastic knob that may be positioned to either position
0 (which means the gas ballast is closed), position 1, or any other elevated rim result
that feeds air to the pumping mechanism with a flow of approximately 25 slm.
If water vapor is present within the system, or will be pumped by the product the gas
ballast must be used to prevent damage to the product. The gas ballast should continue
to be applied with the pump running, for at least 1 hour after the water vapor source
has been removed to enable the pump to dry.
Figure 16 Gas ballast open-close
1. Position 0 (gas ballast is closed)
2. Position 1 (gas ballast is open)
1. Position 0 (gas ballast is closed)
2. Position 1 (gas ballast is open)
6.12 Gas ballast adaptor fit
The manually operated gas ballast knob can be replaced by a gas ballast adaptor which
enables external electrically actuated valves or a controlled gas supply to be used
through a 1/4 inch push fit connector. To install the gas ballast adaptor:
05/2021 - ©Edwards Limited
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A90301880_C
A90301880_C - Operation
