6
G5TWIN OPERATION MANUAL
⚠
WARNING
Use only DOT CFR 49 or UL-approved storage containers for recovered refrigerant.
WHAT CAN HAPPEN
HOW TO PREVENT IT
Refrigerant storage containers may vent or explode
when the working pressure of the container is
exceeded.
Refrigerant storage containers are designed with
different working pressures. Verify that the rating
of the storage cylinder is appropriate for the
refrigerant being recovered.
For R-410a, 4BA400 and 4BW400 are appropriate rat-
ings for refrigerant storage containers.
“80% Shut Off Switches,” also known as Tank
Overfill Sensors and Overfill Protection devices, may
fail to prevent overfilling of the storage cylinder,
leading to venting or explosion.
These sensors only cut power to the recovery
machine, and do not stop the flow of refrigerant,
which may continue due to a siphon, or due to
temperature-induced migration.
Do not rely on these switches to prevent overfilling.
Only a refrigerant scale can provide an active and
accurate measurement of the amount of refrigerant
in the storage container.
Do not rely on these switches to stop the flow of
refrigerant into the container. Only the valves on the
recovery machine and on the cylinder can stop the
flow of refrigerant into the container.
Refrigerant expands when heated (
Diagram 1), and
storage containers may vent or explode when filled
over 80% capacity.
A refrigerant scale must be used to monitor the
amount of refrigerant in the storage container.
Be sure to close the valves on the storage container
when it has reached 80% capacity.
Filled to
80% Capacity
Filled to
90% Capacity
Diagram 1
Overfilled storage containers may
explode due to liquid refrigerant
expanding when heated.
Transportation of refrigerant storage
cylinders more than 80% full is a DOT
violation.
Refrigerant Storage Container Safety
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