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 TM 55-1905-223-24-18-1
To evacuate system, perform the following:
e.
NOTE
If the refrigerant charge is stored in the
condenser unit receiver, refer to paragraph 2-70
for evacuating and charging procedures.
(1) Attach refrigeration vacuum pump to gauge manifold middle hoseline.
CAUTION
Make sure the oil level in the compressor is at
the half-way point in the observation window
before evacuating.
(2) Open both suction and discharge (high pressure) service valves.
(3) Start and run the vacuum pump.
(4) Slowly open both gauge manifold handwheels.
NOTE
Evacuation of system may be a slow process.
(5) Evacuate system until a minimum 18 inches Hz. is indicated on vacuum pump
gage.
(6) Turn off refrigeration vacuum pump.
NOTE
Observe vacuum reading for approximately 15
minutes to ensure sweat joints are good and system
is capable of holding a charge.
(7) If system does not hold vacuum, check tightness of hoseline and if
necessary, resweat fittings previously made.
NOTE
When vacuum reading is maintained for 15 minutes,
system is ready to be charged.
(8)
Shut both gauge manifold handwheels and remove refrigerant vacuum pump
from middle hoseline.
2-333
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