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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(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.
(f)
Do not work in a closed space where R-12 may be leaking unless adequate ventilation is
provided.
(g) Should a person be overcome in a space which lacks oxygen because of high concentrations
of R-12 being present, treat such person the same as for suffocation, i.e., through artificial respiration.
e. Operating Procedures.
(1)
Starting.
Proceed as outlined below to start the condensing unit:
CAUTION
When starting the compressor, avoid rapid pumping down of the low pressure
side. Rapid evacuation may pull the oil from the compressor crankcase. A
variable percentage of refrigerant is always mixed with the oil in the crankcase
and is subject to evaporation at lowering pressures. Rapid boiling of the
refrigerant and consequent high velocity gas will carry large percentages of oil.
The crankcase oil may leave with the evaporating refrigerant and circulate
through the system with perhaps considerable delay in returning to the
crankcase. If the oil is pulled from the crankcase as described, do not run the
compressor without lubricant. Stop the compressor and add oil temporarily. The
added oil may later be removed on evidence of an excess in the crankcase.
4-834
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