Kubota ME5700, Workshop Manual

Page: 464 / 508

ME5700, WSM CABIN
10-S9
4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE
When checking or repairing the air conditioning system, the following precautions and rules must be observed. And
it is of first importance that no other personnel than a well-trained serviceman should be allow to handle the
refrigerant.
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Since direct contact of the liquid refrigerant with your skin will cause frostbite, always be careful when
handling the refrigerant. Always wear goggles to protect your eyes when working around the system.
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The refrigerant service container has a safe strength. However, if handled incorrectly, it will explode.
Therefore, always follow the instructions on the label. In particular, never heat the refrigerant container
above 40
(104 ) or drop it from a high height.
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Do not steam clean on the system, especially condenser since excessively high pressure will build up
in the system, resulting in explosion of the system.
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If you improperly connect the hose between the service valve of compressor and gauge manifold, or
incorrectly handle the valves, the refrigerant service container or charging hose will explode. When
connecting the hose or handling the valve, be sure to check the high pressure side or low pressure side.
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In case the refrigerant is charged while the compressor is operated, do not open the high pressure valve
of the gauge manifold.
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Beware of the toxicity of the gas. The gas is harmless and nontoxic in its original state, however it
produces a toxic substance when it comes in contact with high temperature parts and decomposes.
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Do not heat the service can unless necessary. When it has to be heated, use warm water of 40 (104
) or lower. Do not heat using boiling water.
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If the refrigerant, O-rings, etc. for R12 are used in the R134a air conditioner system, problems such as
refrigerant leakage or cloudiness in the sight glass may occur. Therefore, in order to prevent charging
of refrigerant or erroneous connections, the shapes of the piping joint as well as the shapes of the
service valve and the service tools have been changed.
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Always keep the working place clean and dry and free from dirt and dust. Wipe off water from the line
fittings with a clean cloth before disconnecting.
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Use only for R134a refrigerant service tool.
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Use for R134a refrigerant recovery and recycling machine when discharging the refrigerant.
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Before attaching the charging hose to the can tap valve of the refrigerant container, check each packing
for clogging.
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When disconnecting the charging hose from the charging valve of compressor and receiver, remove it
as quick as possible so that gas leakage can be minimized.
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Be sure to charge the specified amount of refrigerant, but not excessively. Over-charging of the
refrigerant in particular may cause insufficient cooling, etc..
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Since the charging hose can be connected to can tap valve by hand, do not use a pliers for tightening it.
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Keep refrigerant containers in a cool and dark place avoiding such place which are subject to strong
sunlight or high temperature.
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R134a compressor oil absorbs moisture easily, so that be sure to seal after disconnecting the each
parts.
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Do not use old-type refrigerant R12a or compressor oil for old-type refrigerant.
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When replacing the condenser, evaporator and receiver, etc., replenish the compressor oil to
compressor according to the table below.
0000002674E
KiSC issued 04, 2006 A