Thermo King T-1000R, Maintenance Manual

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Refrigeration Maintenance 10-8
Pressure Rise Graphs
Unit Charging (T-Series)
Before charging, make sure that the refrigerant lines from the gauge manifold to the refrigerant supply bottle have been
evacuated or purged.
1. Backseat the suction service valve and make sure the receiver tank outlet valve is still open.
2. Set the refrigerant supply bottle for liquid and open the gauge manifold hand valve. Add liquid refrigerant until the system
has the recommended refrigerant charge (see unit serial number nameplate or the “Specifications” chapter), or until the system
will take no more liquid. The remainder of the charge will be added as a liquid through the suction service valve if more
refrigerant is required.
3. After the liquid refrigerant is added, close the gauge manifold hand valve.
4. Back seat (close) the receiver tank outlet valve, remove the evacuation station hoses, and install the cap on the service port
for the receiver tank outlet valve.
5. If the unit is not fully charged, attach the gauge manifold set to the suction service valve and the discharge service valve. Open
the suction service valve one turn and open the discharge service valve 1/4 turn.
6. Open the refrigerant supply valve for liquid.
7. Start the unit and use the Service Test mode to run the unit in high speed cool. See the appropriate Microprocessor Diagnostic
Manual for information about the Service Test mode.
8. Observe the suction pressure and slowly open the gauge manifold hand valve to allow liquid refrigerant to flow into the
suction service valve. Control the liquid flow so the suction pressure increases approximately 20 to 25 psig (138 to 172 kPa).
9. Add refrigerant until the system has the recommended refrigerant charge (see unit serial number nameplate or the
“Specifications” chapter). Then close the gauge manifold hand valve and the refrigerant supply bottle hand valve.
Leak
Isolate the pump from the system by closing the
proper valve. Watch the movement of the vacuum
gauge needle. If the needle continues to rise,
this is an indication that a leak exists in the unit
or the connecting line. The leak must then be
located and eliminated.
Moisture
Should the needle show a pressure rise but
finally level off to practically a constant mark,
this is an indication that the system is vacuum
tight but is still too wet, requiring additional
dehydration and pumping time.