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 TM 55-1905-219-14-11
5-140. 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 into phosgene, a highly toxic gas.
F
C
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.
5-1413
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