Amerex 14795 - Manual (Page 2)

2
INTRODUCTION
The principles and procedures contained in this manual are intended for the filling and agent
recovery associated with the servicing of Amerex Halotron I hand portable fire extinguishers.
They are intended for qualified service agencies using the Amerex P/N 14538 Halotron
Recharge Kit and any of the Amerex supplied Bulk Recharge Cylinders (Model 890
– 35 lb.,
Model 891 – 80 lb. or Model 892 – 200 lb.). The process of charging fire extinguishers with
Halotron I involves working with a pressurized liquid and high pressure gas, so it should only be
undertaken by trained personnel.
It is recognized that most fire extinguisher service technicians will have had prior experience
servicing halon 1211 extinguishers. While the procedures for Halotron I are similar in most
respects, there are two main differences: the type of elastomers (collar o-rings, valve stem
seals) and the use of argon (instead of nitrogen) for pressurization. The elastomers used with
halon 1211 (or dry chemical) are not compatible with Halotron I. Chloroprene based or EPDM
rubber is used in all Amerex o-rings, valve stem seals and recharge kit seals. If incompatible
elastomers are used, the result can be loss of extinguisher pressure or blockage of the valve
preventing proper discharge.
Extinguisher performance is enhanced and required cylinder volume is reduced by pressurizing
extinguishers with argon, which is more soluble in Halotron I than nitrogen. As the extinguisher
discharges and the extinguisher’s internal pressure drops, argon in solution will move from the
Halotron I liquid into the vapor space. This transfer of argon from the liquid to the vapor space
helps maintain a higher and more even pressure throughout the extinguisher discharge,
especially at cold temperatures. NITROGEN SHOULD NOT BE USED TO PRESSURIZE
HALOTRON I EXTINGUISHERS OR BULK RECHARGE CYLINDERS.
SAFETY PRECAUTIONS
The process of filling extinguishers and bulk recharge cylinders with Halotron I involves the use
of a pressurized liquid and high pressure gas. The process should only be undertaken by
personnel trained in the use of these kinds of materials. High pressure (compressed) gases can
be extremely dangerous if not handled properly. Improperly installed or maintained pressure
regulators or hose assemblies can cause system failures and result in possible personal injury.
Follow the instructions precisely for the installation of these components.
A. Chemical Hazards
The primary component of Halotron I is HCFC-123 (2,2-dichloro-1, 1, 1-
trifluoromethane). Toxicologically, this chemical has been widely studied. The LC
50
(4
hr., rats) has been determined to be between 2.8 and 3.2% by volume. The cardiotoxic
LOAEL (lowest observable adverse effect level) is 2% by volume. The NOAEL (no
adverse effect level) is 1% by volume. HCFC-123 is relatively non-toxic, however, all
measures should be taken to minimize inhalation of any vapors.
The primary hazard associated with argon used for extinguisher pressurization is its
ability to function as a simple asphyxiant (i.e. to displace oxygen. FILLING
OPERATIONS SHOULD BE CONDUCTED IN A WELL VENTILATED
ENVIRONMENT.