4
⚠
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 appropri
-
ate ratings 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
WS260 OPERATION MANUAL
© 2019 APPION INC. - ALL RIGHTS RESERVED
✪
See Page 8 for information on how to
calculate 80% Fill Weight
