Figure 6-2. Thermostatic switch assembly inspection requirements.
(c) Dry condenser as thoroughly as possible
6-5. Condensers
a. Removal.
with compressed air, and complete drying by heating in
an oven for at least one hour at 250 F (121.1 C)
(1) Disconnect the tube assemblies that connect
to the condensers.
maximum.
(2) Remove the screws (182, fig. 6-1, sheet 6 of
(2) Test condenser for refrigerant leakage as
6) and washers (183) at the sides of the condensers.
follows.
Remove the bolts (184) and washers (185) at the top of
(a) Seal condenser as instructed (para b (1)
the condensers. Remove the foam tape (186) and
(a) ) above.
condensers (187) from the power plant.
(b) Connect unit refrigerant inlet to
b. Testing.
refrigeration system in service unit (para 2-4 b) as
(1) Pressure test condenser as follows:
shown in figure 6-3. Use synthetic rubber tubing in test
(a) Attach end seal plates (see Special
setup.
Tools, table 2-1) to condenser ports.
(c) Open valve connecting condenser to
(b) Apply compressed air at refrigerant
vacuum pump and evacuate condenser for at least 15
vapor inlet duct seal, pressurize condenser to 148 2.0
minutes at maximum pressure of 0.5 inch of mercury
absolute.
psig, and immerse condenser in water for five minutes.
(d) Shut off valve to vacuum pump and
There must be no leakage indicated by bubbles, or
evidence of permanent deformation of condenser as a
charge condenser by permitting refrigerant gas to flow
result of pressure applied during test.
into condenser until no more flow occurs.
Figure 6-3. Refrigerant leakage test setup.
6-14
