1. Unload the system using recovery equipment of the refrigerant.
2. Disconnect the anticondensation tube condenser and drier. Stop and weld the drier, the condenser tube and one
open extreme of the anticondensation tube.
3. Weld 6.35 mm load hose switch to the open extreme of the anticondensation tube.
4. Connect a pressure manometer and an access valve to the anticondensation tube, lifting its pressure to 36.25 kPa
with dry nitrogen or carbon dioxide.
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WARNING
NEVER INCREASES PRESSURE WITH OXYGEN, NOR OPEN A HIGH PRESSURE TANK UNLESS
EQUIPPED WITH A PRESSURE REGULATOR. NEVER APPLY HIGH PRESSURE TO THE COMPRESSOR HEAD –
IT MIGHT EXPLODE. MAKE SURE MANOMETER SWITCHES ARE IN GOOD CONDITIONS AND HAVE NO
LEAKAGES.
5. Leave the tube heat with pressure for 24 hours. If pressure lowers, it will indicate leakage.
COMPRESSOR REPLACEMENT
NOTE:
Before installing a new compressor, check possible contamination in the system by extracting an oil sample from
the old compressor. If the oil smells burn but has no residues nor color changes, the compressor can be replaced
normally.
If the oil smells burn sugar and shows contamination (dark color), clean the system thoroughly to eliminate as much
contamination before installing the new compressor and drying filter. If contamination is left in the system, it will mix with
the new oil, will contaminate it, will harm the new compressor or will obstruct the drying filter or the capillary tube.
Note: The refrigerant used to clean the system must be recovered. For this reason, it is recommended to use
dry nitrogen in this cleaning process.
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CAUTION Use
dries nitrogen carefully when cleaning systems. Make sure of using adequate quality hoses for
pressure application and that equipment is in good conditions. Fix a cloth over the coil extreme being cleaned, to avoid
the old oil spread in the room.
How to clean the system:
1. With compressor and drying filter dismounted, connect a process coupler to the condenser entry tube.
2. Connect the hose to the process coupler and nitrogen tank.
3. Open the tank and allow nitrogen flow through the condenser until the discharge is clear.
4. Disconnect the evaporator capillary tube. Clean the evaporator like the condenser.
5. Clean the capillary tube and re – assemble the system.
The compressor and drying filter should be re – assembled on a continuous sequence to avoid longer system exposure
to the atmosphere.
Besides, avoid opening the system when components or lines are cold.
Spare compressors include gum caps in the suction, discharge and process tubes and the correct oil load and inert gas
maintenance load. Compressors have a low side process tube fixed to the shield. The spare compressor might also
have an oil cooler, even if the original compressor didn’t include one. If the product is not equipped for oil cooler, leave
the plastic caps in their place and install the new compressor by connecting only the suction and discharge lines.
Connection is made with a proces tool in the drying filter high-pressure side process tube. This tube is located in the
upper part of the mentioned filter.
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