TM 9-4120-399-14
5-6. DETECTING AND REMOVING MOISTURE. (Continued).
(2) Valve Frozen Open. If the expantion valve is frozen open, the following
characteristics may be observed:
(a) Suction pressure remains abnormally high.
(b) Compressor pounds.
(3) Liquid Moisture Indicator. If coloe indicator is pink, moisture is in system.
b. Removing Moisture. The following means may be used to remove moisture from the
refrigeration system. It will be necessary to artificially warm the expansion valve or shut off
and warm the entire unit for a long enough period of time to thaw the frozen water in the
system, enabling it to be recirculated with the refrigerant.
the moisture it can hold, change the dehydrator. Run on this for approximately one
day; then change again to another fresh dehydrator. This may strip enough moisture
from system to correct the condition.
(2) Use Service Dehydrator. Operate the unit approximately an hour with service
drier and replace dehydrator on unit with fresh dehydrator.
5-7. DISCHARGING THE REFRIGERANT SYSTEM.
WARNING
DANGEROUS CHEMICAL
(R22)
is used in this equipment
DEATH
or severe injury may result if personnel fail to observe safety precautions.
Use great care to avoid contact with liquid refrigerant gas being discharged
under pressure. Sudden and irreversible tissue damage can result from
freezing. Wear thermal protective gloves and a face protector or goggles
in any situation where skin-eye-contact is possible. Prevent contact of
refrigerant gas with flame or hot surfaces. Heat causes refrigerant to
break down and form carbonyl chloride (phosgene), a highly poisonous
and corrosive gas.
WARNING
REFRIGERANT UNDER PRESSURE
is used in the operation of this equipment.
DEATH
or severe injury may result if you fail to observe safety precautions.
Never use a heating torch on any part that contains refrigerant 22. Do
not let liquid refrigerant touch you, and do not inhale refrigerant gas.
