Appion WS260 Operation Manual - Page 4

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Refrigerant Storage Container Safety

⚠ WARNING

Use only DOT CFR 49 or UL-approved storage containers for recovered refrigerant.

WHAT CAN HAPPEN

Refrigerant storage containers may vent or

explode when the working pressure of the

container is exceeded.

"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.

Refrigerant expands when heated (Diagram 1),

and storage containers may vent or explode

when filled over 80% capacity.

Filled to

80% Capacity

WS260 OPERATION MANUAL

HOW TO PREVENT IT

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 appropri-

ate ratings for refrigerant storage containers.

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.

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.

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.

✪

Filled to

90% Capacity

See Page 8 for information on how to

calculate 80% Fill Weight