Amerex 14795 - Manual (Page 5)

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Depending on the temperature when filling the extinguisher, it may be necessary to adjust the
final pressure. See temperature vs. pressure charts below.
D. Agent Recovery Principles:
Halotron I should always be stored and transferred under pressure to ensure that the inert
gases in the blend are not released. The Halotron I agent in the extinguisher can be
transferred to a recovery cylinder either by a pump or by using pressure differentials. If
using a pump, ensure that all pump materials and seals are compatible with Halotron I.
Generally, there are four steps to this transfer when not using a pump:
1. Connect the extinguisher to the line leading to the recovery cylinder liquid valve.
2. Open the extinguisher valve to allow the liquid from the extinguisher to transfer to the
recovery cylinder (because of back-pressure, not all liquid will transfer).
3. Re-pressurize the extinguisher to operating pressure with argon (flip valve allows this to
be accomplished without disconnecting the extinguisher from the line to the recovery
cylinder).
4. Repeat Steps 2 and 3 until no more liquid will transfer from the extinguisher (usually 2-3
times).
When the transfer is complete, the extinguisher can be vented and serviced according to the
step by step procedure. There will be a small amount of residual Halotron I left in the
extinguisher which will evaporate when the extinguisher is opened. Agent recovery should be
performed in a well-ventilated area to prevent vapor accumulation.
After servicing has been completed and the extinguisher is ready to be refilled, the recovery
cylinder can be treated as any other Halotron I bulk cylinder. Refill the extinguisher according to
the step by step procedure. Between each extinguisher service, the recovery cylinder should be
vented down to approximately 5 psig (34 kPa). By venting to this minimal pressure, a small
liquid heal will remain (minimizing further heal loss) and the positive pressure will ensure that no
contaminants enter the cylinder.
Prior to the first time use of a recovery cylinder, the cylinder should be internally inspected for
cleanliness and then vacuumed to a minimum of 27 inches (686 mm) mercury (at sea level).