Because the suction line capillary
tube assembly, sometimes referred
to as heat exchanger or pullout coil,
has no moving parts, it very rarely
if ever needs servicing.
vacuum on the system to at
least 1500 microns.
♦ Break the vacuum by adding
refrigerant into the system until
the pressure is above 0 PSIG.
Always charge the refrigerant
line into the system through a
new drier in the charging
manifold line. A 16 cubic inch
drier is sufficient for this
purpose.
However, should a leak occur in the
system, it is possible that dirt,
dust, or moisture may collect in the
capillary tube causing the system
to go into a vacuum. Should this
occur, it is recommended that dry
nitrogen or a dry refrigerant be
forced through the system to clear
the blockage.
♦ Repeat steps 2 and 3 two more
times, the third time evacuating
the system to 500 microns.
If attempts to clear the restriction
by this method are unsuccessful,
the ENTIRE ASSEMBLY, NOT
THE CAPILLARY TUBE ONLY,
should be replaced with a new
factory ordered replacement.
OPERATIONAL DATA
The following is typical data for the
LBN series based on lab tests, and
may vary under field operating
conditions.
CRANKCASE PRESSURE
REGULATOR
Amb. Temp. 75
o
F
Head Press 230-250 psi
♦ The LBN series employ a
crankcase pressure regulator in
the suction line and is
considered part of the heat
exchanger. The CPR is set for
10 psi. The purpose of the valve
is to maintain a low suction
pressure on start-up so that the
compressor will start properly.
Suct. Press 6-8 psi
*Discharge Temp. -25
o
F
*Discharge temperature is the
temperature taken off the lower
half of the nose screen.
REFRIGERANT CONTROL
Refrigerant flow to the evaporator
is controlled through the use of a
capillary tube. The capillary tube
is soldered for a specified length to
the suction line, forming one
♦ On start-up, the valve will hold
the suction pressure at the
desired setting until the suction
pressure has dropped below the
setting, then the valve will
open.
integral piece to assure proper heat
exchange.
16
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