bubbles) and no evidence of permanent deformation of
(13) Touch up defective painted surfaces with
receiver as a result of pressure applied during test.
one coat of primer mixed one part primer to one part
Exhaust air and remove unit from test setup.
catalyst thinner; allow to air dry for at least two hours or
bake for one-half at 150 to 275 F (65.6 to 135 C).
(d) Dry receiver as thoroughly as possible
with compressed air and complete drying by heating in
Cover primer coat with one coat of black wrinkle enamel
an oven for at least one hour at 250 F (12'1.10 C)
Military Specification MIL-E-5558 and bake for one hour
at 250to 300F (121.1to 148.9C).
(2) Test receiver for refrigerant leakage as
Assemble in reverse order of
(a) Seal receiver as instructed (para e (1)
(1) Pressure test receiver as follows.
(b) Connect liquid inlet of unit to
(a) Attach and secure end plate seals (see
refrigeration system service unit as shown in figure
Special Tools, table 2-1 to the ports of the receiver.
(c) Open valve connecting receiver to
vacuum pump, and evacuate receiver for at least 15
close valve (4); replace cap.
minutes at maximum pressure of 0.5 inch of mercury
(c) Apply compressed air at liquid inlet port
seal, pressurize receiver to 165 2.0 psi gauge, and
immerse receiver in water for five minutes. There must
be no leakage (indicated by complete absence of
Figure 6-6. Refrigerant leakage test setup.
(d) Shut off valve to vacuum pump and
fitting. Use leak detector to check for leakage from
receiver through disconnect fitting.
charge receiver by permitting refrigerant gas to flow into
(f) Fabricate an airtight box large enough to
receiver until no more flow occurs.
(e) Shut off source of refrigerant gas and
contain one unit at a time. Locate hole for leak detector
probe on side of air-tight box near the bottom, and seal
pressurize receiver with nitrogen until mixture of
hole with tape. Use leak detector
refrigerant gas plus nitrogen reaches 100 psi gauge.
Shut off source of nitrogen, close the shutoff valve near
the disconnect fitting, and separate the disconnect