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 TM 55-1905-220-14-11
5-143. COMPRESSOR - HVAC - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - SAFETY PRECAUTIONS (Cont)
g. During the shutdown period of any condenser, if there is a possibility of obtaining freezing
temperatures in the machinery room, drain the condenser and connecting piping to prevent a freeze-up and
damage to condenser tubes.
h. After an inspection or repairs have been made, always be sure to expel all the air from the part of
the system that has been. opened by admitting a small amount of refrigerant gas into that part of the system.
2.
Handling Refrigerant-12.
a. Refrigerant-12 is practically odorless and non-toxic. It is not necessary to wear a gas mask when
servicing equipment in which it is contained unless the conditions necessary for the decomposition of R-12 to
phosgene gas exist. Refer to item b. below.
b. Never use a torch or attempt a repair on a line containing R-12 until it is certain that all gas has
been pumped out of the section of pipe to be repaired, the area is well ventilated and the line has been valved
off. Refrigerant-12 in contact with an open flame of high temperature (about 1,000 (557.8 )) decomposes
F
C
into phosgene, a highly toxic gas.
c. Always wear goggles when handling R-12, or servicing equipment in which it is contained, to avoid
the possibility of liquid refrigerant coming in contact with the eyes.
d. If liquid R-12 accidentally comes in contact with the eyes, take person suffering the injury to the
medical officer at once. Do not rub or irritate the eyes and give the following first aid treatment immediately:
(1) Introduce drops of sterile mineral oil into the eyes as an irrigant.
(2) If irritation continues at all, wash the eyes with a weak boric acid solution, or a sterile salt
solution not to exceed 2%
sodium chloride.
e. Should liquid R-12 come in contact with the skin, treat the injury the same as though the skin had
been frost bitten or frozen.
5-1483
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