6-8
Refrigerant Leak Test Procedure
Refrigeration System Diagnosis and Service
CSR-20 & CSR-40, September 1999
Purging a Gauge Manifold and Hoses
1.
Inspect gauge manifold for proper hose and fitting con-
nections.
2.
Clean dirt and moisture from around service ports on ser-
vice valves. Remove service port caps from service
valves (if required).
3.
Rotate both hose coupler hand wheels on the gauge mani-
fold set counterclockwise to back the stem out of the high
and low hose fittings.
4.
Attach the low side hose (compound gauge) to the port on
the suction line service valve. Purge the low side hose:
a.
Open the low side (suction) hand valve on the gauge
manifold fully to center port.
b.
With 70 kPa, 0.70 bar, 10 psig or greater pressure in
the low side, rotate the suction hose fitting hand
wheel clockwise to open (depress) the suction line
port valve to the low side hose.
c.
Slowly screw a 1/2 inch ACME fitting into the low
loss fitting on the manifold’s service (center) line to
purge the suction and service hoses.
d.
Remove the ACME fitting after purging the suction
hose.
e.
Close the low side (suction) hand valve on the gauge
manifold fully to center port.
5.
Attach high side hose (pressure gauge) to the port on the
discharge line service valve. Purge the high side hose:
a.
Open the high side (discharge) hand valve on the
gauge manifold fully to center port.
b.
Rotate the discharge hose fitting hand wheel clock-
wise to open (depress) the discharge line port valve to
the high side hose.
c.
Slowly screw a 1/2 inch ACME fitting into the low
loss fitting on the manifold’s service (center) line to
purge the discharge and service hoses.
d.
Remove the ACME fitting after purging the discharge
hose.
e.
Close the high side (discharge) hand valve on the
gauge manifold fully to center port.
6.
The gauge manifold set is not ready to use to check sys-
tem pressures and perform MOST service procedures.
Refrigerant Leak Test Procedure
Use a reliable Halogen leak detector such as model H10G, P/N
204-712 or 204-756 (portable), to leak test the refrigeration
system. Inspect carefully for signs of compressor oil leakage
which is the first sign of a leak in the refrigeration system.
NOTE: Due to environmental concerns and personal
safety, the use of a Halide torch is no longer recom-
mended.
If refrigerant has leaked or been removed from the unit:
1.
Check entire system for possible component damage and
refrigerant oil loss.
Testing for Refrigerant Leaks
Purging Gauge Manifold
1. Quick Disconnect Access Valve
2. Discharge Connection
3. Suction Connection
