Thermo King T-1000R, Maintenance Manual

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Refrigeration Maintenance 10-7
Select Evacuation Test
4. The display will indicate that the Evacuation Mode is being programmed.
Programming
5. Turn the unit off.
Unit Evacuation
Do not attempt to evacuate the unit until the evacuation equipment has been tested and its performance has been verified.
1. Prepare the unit for evacuation. Recover refrigerant to 0 psig (0 kPa).
NOTE: Federal Regulations require your recovery machine to pull the system’s pressures lower than 0 psig [0 kPa].
2. Put the unit into the Evacuation Mode (see “Using Evacuation Mode (Not on T-500R/T-Dairy)” on page 10-6). (Not on
T-500R/T-Dairy)
3. Install the evacuation station hoses on the receiver tank outlet valve, suction service valve, and discharge service valve.
4. Mid-seat the receiver tank outlet valve, suction service valve, and discharge service valve and install the valve stem caps.
5. Connect a gauge manifold and refrigerant supply to the charging port above valve V-4. Bottle valve closed.
6. Start the vacuum pump and open valves V-1, V-2, V-3, V-4.
7. Evacuate the refrigeration system to 500 microns or the lowest achievable level between 500 and 1000 microns.
NOTE: The presence of refrigerant in the compressor oil may prevent a low micron reading from being achieved. The
oil can continue to “outgas” for long periods of time. If the micron level appears to stall after 1/2 hour or 45 minutes
between 1000 and 1500 microns, back seat the suction service valve and observe the micron gauge. A sharp drop in the
micron reading (300 to 500 microns) would indicate that refrigerant is present in the oil or a leak exists in the
compressor area. The micron gauge reads “ATM” if there is a leak to the atmosphere. See Figure on page 10-8.
8. When the desired micron level has been achieved (500 to 1000 microns), close valve V-1, stop the pump.
9. Observe the reading on the micron gauge after 5 minutes have elapsed. The vacuum rise should not exceed 2000 microns.
• If the vacuum level exceeds 2000 microns after 5 minutes, a leak is present or additional evacuation time is required. (See
the Figure “Pressure Rise Graphs” on the next page.)
• If the vacuum level is acceptable, proceed to unit charging.
CAUTION: Do not attempt to evacuate a unit until you are certain that the unit is leak free. A unit with less than a
full refrigerant charge should be thoroughly leak checked and all leaks must be repaired.