Loss Final Test - Sunbeam 20060328 Service Manual

σCAUTION If high vacuum equipment is used, open both valves gently and keep them in this position for a few minutes,
then open the two turns slowly against the clock hands. This will prevent the compressor oil make foam and be
suctioned by the vacuum pump.
2. Operate the vacuum pump for 30 minutes until reaching a minimum of 450 microns.
3. Close the multiple valves connected to the vacuum pump. Observe the compound manometer for a few minutes. If
reading increases, there is loss in the system, and must continue with step 4. If there is no loss, stop the vacuum
pump. The system is now ready to be loaded.
4. If a loss indication appears, stop the vacuum pump and insert a small refrigerant load in the system, opening the
cylinder loader until the system is pressurized to 5.8 kPa or 7.25 kPA.
Check if there is loss in the low side. Operate the compressor for some minutes and check if there is loss in the high
side. If so, connect the refrigerant recovery system. Operate the recovery system, open the line extraction valve and
allow the refrigerant transfer to an approved tank, repair leakage and return to step 1.
How to load the system
THE APPROPRIATE REFRIGERANT LOAD IS INDICATED IN THE FEATURES PLATE LOCATED IN THE REAR
PART OF THE REFRIGERATOR.
Cylinder Loader Preparation:
1. The cylinder loader should have at least 230 gr more refrigerant than the required load.
2. Plug in the cylinder heater and raise the 4.5 kPa pressure over the manometric pressure to a room temperature.
σCAUTION Maintain without exceeding this 4.5 kPa increase in the manometric pressure during the system
loading.
σWARNING
DO NOT USE A HEAT EXTERNAL SOURCE IN THE CYLINDER NOR EXCEED THE MAXIMUM
MANOMETRIC PRESSURE IN THE CYLINDER LOADER.
How to load the tube system:
1. Fix the cylinder loader scale to the pressure indicated in your pressure manometer.
2. Observe the refrigerant level in the indicator tube. Subtract the quantity to be loaded in the system and note the
closure point.
3. Open the cylinder loader valve slowly, and allow the right load enter the system.
4. As soon as the refrigerant in the indicator tube lowers the predetermined level, close the valve and allow it level for a
few minutes.
σCAUTION In that moment disconnect the cylinder loader heater to prevent cylinder pressure overcome its
maximum limit.
5. Operate the refrigerator's compressor. Leave for some minutes for final proof.
6. If the proof shows a correct unit operation, take the process tube with the stopper, with the unit still in operation.
Using a tube cutter cut it around 50 mm from the stopper tool. Use silver welding and weld the process tube to close.
7. Switch off the refrigerator and allow the unit settle for some minutes. Check if there is refrigerant loss in the process
tube.

LOSS FINAL TEST

1. With the refrigerator switched off, verify if there are leakages in the low side system elements.
2. Turn on the unit and operate until the condenser is warm. Check if there are leakages in the high side system
elements.
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