Hitachi air Core 600 Installation & Maintenance Manual page 9

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Such inspections should take into account the effects of service life or continuous vibration
from sources such as compressors or fans.
6. Detection of flammable air conditioners
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Do not use fire sources to locate or detect air conditioning water leaks.
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Do not use a leak detection flame head (or any other detection device that uses an open
flame).
7. How to detect leaks
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An electronic leak detector should be used to detect flammable air conditioners, but the
sensitivity value may not be sufficient or may need to be recalibrated.
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Make sure the leak detector is not a source of fire and is suitable for the air condition er
being used.
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The leak detector should be set to a percentage of the air conditioner LFL and should be
calibrated with the air conditioner used to confirm the correct gas percentage (up to 25%).
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Liquids with leak detection properties are suitable for most pharmaceutical applications and
chlorine-containing laundry water should not be used as chlorine may interact with air
conditioning and corrode copper pipes.
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If a leak is suspected, extinguish or extinguish the fire.
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If an air conditioner leak that requires soldering of pipes is found, all air conditioning water
must be transferred or separated from the system (by closing various valves and storing in
a part of the system away from such leaks).
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Nitrogen gas (OFN) is used to remove air from the system before and during the bonding
process.
8. Air conditioner water transfer
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General procedures should be followed when opening the air conditioning circuit for repair
or for any other purpose
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However, it is important to follow best practices because of flammability and flammability
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Something to remember
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The following procedures should be followed:
o Air conditioning
o Use inert gases to remove air from the loop
o Rinse
o Revent the air with an inert gas.
o Open the circuit by cutting or brazing
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Air conditioning refills should be pumped using appropriate drainage cylinders.
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OFN should be used to "clean" the system to ensure system safety.
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This procedure may need to be repeated several times.
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Do not use compressed air or oxygen for this operation .
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Flushing is completed by destroying the vacuum in the system using OFN, increasin g the
vacuum to the pressure generated by the operation, then venting it into the atmosphere and
finally into the vacuum.
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This process should be repeated several times until there is no air conditioning i n the
system.
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When the last OFN is added, the system should be drained to atmospheric pressure in
order to be able to work.
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This work is especially important when welding on pipes.
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Ensure that the outlet of the vacuum pump is not near any fire source and can be ventilated.
9. Guidelines for refilling the air conditioner
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In addition to general refueling practices, the following regulations should be followed:
o When using air conditioning filling equipment, ensure that different types of air
conditioning are free from contamination.
o Hoses or hoses should be as short as possible to minimize the amount of air fluid
contained in such hoses and hoses.
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