CUSTOM
AIR
CONDITIONING
1A-3
COMPRESSOR
Fig.
1A-2
Schematic
-
Evacuating
Refrigerant
System
b.
Remove caps
from
gauge
fittings
on
P.O.A.
valve
and compressor.
c.
Attach
Schrader
valve
adapter J 5420 to end
of
hose
from
low pressure gauge and connect
this
adapter
fitted
hose to
suction
gauge
fitting.
d.
Attach
Schrader
valve
adapter J 6163 to end
of
hose
from
high
pressure gauge and connect
this
adapter
fitted
hose to discharge gauge
fitting.
3.
Attach
a
flexible
gauge hose to center
fitting
of
the
gauge set and attach the other end of
this
hose
to
the vacuum pump J 5428 or J 5428-01 (Fig.
1A-2).
4.
The system can now be evacuated.
EVACUATING
COMPLETE SYSTEM
1.
Turn
hand
shut-off
valve
on low pressure gauge
of
gauge set to
full
clockwise
position.
2.
Slowly
turn
valve
on
high
pressure gauge
coun-
terclockwise
from
full
clockwise
position,
letting
any
pressure
build-up
escape
completely.
Close
high
pressure
valve.
3.
Check oil
level
in vacuum pump and add
Frigi-
daire
150
viscosity
oil or equivalent, If necessary,
to
bring
to proper
level.
Make
sure dust cap on
dis-
charge side of vacuum pump has been removed.
4.
Start the vacuum pump and
slowly
open low and
high
pressure sides of
manifold
gauge set to
avoid
forcing
oil out of
refrigeration
system and the
pump.
Pressure is now
being
reduced on
both
sides of
refrigeration
system.
NOTE:
If oil is blown from vacuum pump, it
should
be refilled to the proper level with
Frigi-
daire 150 viscosity oil or equivalent.
5. Observe low pressure gauge and operate vac-
uum
pump
until
gauge shows
26-28"
vacuum.
Con-
tinue
to run pump for ten
additional
minutes.
NOTE:
In all evacuating procedures specification
of
26-28 inches of vacuum is used.
This
evacuation
can
only be attained at or near sea level. For each
1000 feet above sea level where this operation is
being performed, specification should be lowered
by one inch of mercury vacuum. For example: at
5000 feet elevation only 21 to 23 inches of vacuum
can
normally be obtained.
If
vacuum cannot be
pulled
to the
minimum
spec-
ification
for the respective
altitude,
it indicates a
leak
in the system, gauge connections or a defective
vacuum
pump.
In
this
case,
it
will
be necessary to
To Next Page
Loading...
