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AIR-CONDITIONING-Service
Adjustment
Procedures
24-33
2080113
6
Refrigerant
Compressor
\
Cl"""
tester
T-7
Leak
, tester
pick
up
tube
b/
2OUO316
TESTING
SYSTEM
FOR LEAKS
N24FFA8
A leak is likely to occur where two components
are connected
together.
See illustration
for possible locations.
The Leak Detector
Torch is a butane gas-burning
torch used to
locate a leak in any part of the refrigeration
system.
Refrigerant
gas drawn into the sampling
or "sniffer"
hose will cause the flame
to change color in proportion
to the size of the leak. A very small
leak will produce a flame varying from yellowish-green
to bright
green. A large leak will produce a brilliant
blue flame.
Caution
Do not use the lighted
detector
in any place where
explosive
gases, dust or vapors
are present.
Do not breathe
the
fumes
that
are produced
by the burning
of refrigerant
gas.
Large
concentrations
of refrigerant
in the presence
of a live
flame
become
dangerously
toxic.
If the flame remains
bright yellow when the tester is removed
from a possible leak point, insufficient
air is being drawn in through
the sampling
tube, or the copper reaction wire is dirty.
(1) Assemble
leak detector
as shown be sure detector
is seated
tightly over torch gasket.
(2) Holding torch upright screw-in butane charger (clockwise)
until
punctured.
(Do not use force).
(3) Screw-out
butane charge (counterclockwise)
about l/4 turn.
(4) Point torch away from body-then
light escaping
gas with
match. Always keep torch in upright position.
(5) Adjust flame by turning cartridge
in or out as required.
(6) Allow 30
seconds
to heat copper
reaction
wire.
Caution
Never remove
butane
charger
while
torch is lighted
or in the
presence
of any open flame.
(7) Examine all tube connectors
and other possible lead points by
moving
the end of the sampling
hose from point to point.
Always keep torch in upright position.
Since R-12
is heavier
than air, it is good practice to place the open end of sampling
hose directly below point being tested. Be careful not to pinch
sampling
tube since this will shut off air supply to flame and
cause a color change.
(8) Watch for a change in the color of the flame. Small leaks will
produce a green color and large leaks a bright blue color. If
leaks are observed
at tube fittings,
tighten
the connection,
using the proper flare wrenches,
and retest.
1 STB Revision
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