Removing The Gauge Manifold Set - Thermo King MAGNUM Maintenance Manual

Refrigeration Maintenance
3. Remove small service port caps from suction
and discharge service fittings. Save and reuse
the caps and sealing washers or gaskets.
4. Rotate both hose coupler hand wheels
counterclockwise to back the stem out of the
high and low hose fittings. Attach low hose
(compound gauge) to the suction line valve
port.
5. Open the suction service manifold hand valve
fully with 69 kPa, 0.69 bar, 10 psig or greater
pressure in the low side (unit operating on
Cool). Rotate the suction hose fitting hand
wheel clockwise to open (depress) the suction
line port valve to the low hose.
6. 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. Remove ACME fitting after purging.
7. Close the suction service manifold hand valve
fully to center port.
8. Attach high side hose (pressure gauge) to the
discharge service line port.
9. Open discharge service manifold hand valve
fully. Rotate discharge fitting hand wheel
clockwise to open (depress) discharge line
port valve to the high hose.
10. Slowly screw a 1/2 inch ACME fitting into the
manifold's service (center) line to purge the
high and service hoses. Remove ACME fitting
after purging.
11. Close discharge service manifold hand valve
fully to center port. You are now ready to use
the gauge manifold to check system pressures
or perform most service procedures.
NOTE: These gauges may be removed and
reinstalled without additional purging so
long as a slight positive pressure remains in
the manifold and hoses when removed from
the unit.
132
AFE85
1. Suction Connection
2. Discharge Connection
Figure 83: Purging Gauge Manifold

Removing the Gauge Manifold Set

NOTE: THE SYSTEM SHOULD BE
RUNNING to ensure minimum refrigerant
release to the atmosphere,. However, this is not
possible in all cases, but the same procedure
should be followed.
1. Rotate discharge hose fitting hand wheel
counterclockwise to withdraw the fitting stem
from the discharge line port valve. Then open
both service manifold valves to center port.
2. Operate the unit on Cool using the
"CAPACITY 100 percent" test from the
Manual Function Test menu of the controller.
CAUTION: Rubber gloves are
recommended when handling Ester based
compressor oil.
3. Rotate the suction hose coupler hand wheel
counterclockwise to withdraw the fitting stem
from the suction line port valve. Then turn the
unit off.
4. Remove the gauge lines from the suction and
discharge service fittings and cap the service
ports.
5. Secure all manifold lines to manifold hose
anchors when the manifold is not in use.
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