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  TM 5-4120-359-14
WARNING
nature. Exposure of Refrigerant
If it is burned or heated indoors,
22 to an open flame or a very hot
such as during a welding operation
surface will cause a chemical
Disconnect input power to the air
nearby, you should take care to
reaction in the gas to form
conditioner before performing any
ventilate the area thoroughly. An
carbonyl chloride (phosgene), a
maintenance to the electrical
exhaust system like that of a paint
highly toxic and corrosive gas. In
system. Voltages used can be
spray booth should be used.
its natural state, refrigerant 22 is a
lethal. Shutting the unit off at the
colorless odorless vapor with no
control
module
does
not
Air-supplied respirators, approved
toxic characteristics. It is lighter
disconnect power to the various
by the National Institute for
than air and in a well ventilated
components of the air conditioner.
Occupational Safety and Health
area
will
disperse
rapidly.
Administration or the United States
WARNING
However, in an unventilated area it
Bureau of Mines, should be used
presents danger as a suffocant.
for all welding in confined spaces
and in places where ventilation is
Allow heaters to cool before
WARNING
inadequate. Persons who have
touching. Severe burns can result
chronic or recurrent respiratory
from touching hot heaters.
conditions, including allergies and
Be sure the refrigeration system is
WARNING
asthma, should not work in these
fully discharged and purged and
areas.
that dry nitrogen is flowing through
the system at the rate of less than
Do not allow anyone under
3
WARNING
1 - 2 cfm (0.028 - 0.057 m /minute)
equipment suspended from a lifting
before all brazing or debrazing
device.
operations.
DANGEROUS CHEMICAL
Do not allow the unit to swing while
is used in this equipment
suspended from a lifting device.
Failure to observe this warning
DEATH
may result in injury to personnel
or serious injury may result if
and damage to the equipment.
personnel fail to observe proper
safety precautions. Great care
WARNING
must be exercised to prevent
contact of liquid refrigerant or
·
refrigerant gas discharged under
The covers, grilles, and
pressure, with any part of the
screens installed on this unit
body.
The extremely low
are there for a purpose.
temperature resulting from the
·
rapid
expansion
of
liquid
Do not operate this unit with
refrigerant or refrigerant gas
them off or open unless the
released under pressure, can
instructions tell you to. When
cause sudden and irreversible
this is necessary, do so with
tissue damage through freezing.
care.
As a minimum, all personnel must
wear thermal protective gloves and
WARNING
a face shield or goggles when
working in any situation where
The burning of polyurethane foams
refrigerant contact with the skin or
is dangerous.
eyes is possible. Application of
excessive heat to any component
Due to the chemical composition of
in a charge system will cause
a polyurethane foam, toxic fumes
extreme pressure that may result
are released when it is burned or
in a rupture, possibly explosive in
heated.
b
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