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replace see the procedure
described under "Defrost
Thermostat".
REFRIGERATION
As stated previously, the LBN
series are self-contained. They
feature semi-hermetic
compressors, a bare tube, front-
air discharge condenser,
combination cold wall tubing
with upper evaporator coil, and
capillary tube.
The exception is the LBN-10,
which has a fin-and-tube
condenser and horizontal,
straight through air discharge.
If it should become necessary to
leak test the system, please
adhere to the following notice:
NOTICE:
Because of the CFC atmospheric
considerations being taken
today, we ask that leak testing
be done with refrigerant 22
mixture with nitrogen. If the
condensing unit nameplate
designates a refrigerant other
than R-22 remove all R-22 from
the immediate area to avoid
confusion after leak testing and
evacuating the unit. Recharge
the unit with proper
refrigerant.
LEAK TESTING
The test gas cylinder must be
equipped with a pressure gauge
and regulator so that system
test pressures do not exceed
maximum allowable limits. Do
not ever use anything other
than an R- 22 / Nitrogen
mixture for leaks testing.
Attach a refrigerant test gas
cylinder to your service
manifold and connect the
manifold to the charging port on
the liquid line valve. Charge an
R-22 / Nitrogen mixture into the
system, raising the pressure to
the unit's nameplate for the low
side and high side pressures.
Using an electronic detector,
carefully check the entire
system for leaks. Take special
care to inspect all brazed and
flare connections.
EVACUATION
After the system is proven leak
tight, thoroughly evacuate the
system according to the following
procedure:
Discharge the refrigerant-
nitrogen mixture, allowing it to
blow from the system as rapidly
as possible, into an empty
cylinder. Be sure that all service
valves and solenoid valves are
open to allow all of the mixture
to be discharged.
Connect a deep-drain vacuum
pump to both the high and low
side of the system. Pull a
15
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