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Maintenance Procedures
Performing the gas leak tests for repair
In case of repair of the refrigerant circuit, the following
procedure must be kept to consider flammability.
1
Remove the refrigerant.
2
Purge the refrigerant circuit with inert gas.
3
Perform evacuation.
4
Purge the circuit again with inert gas.
5
Open the circuit.
6
Perform repair work.
7
Charge the system with refrigerant.
8
Flush the system with nitrogen blowing for safety.
9
Repeat the previous steps several times until no
refrigerant is within the system.
CAUTION
•
Compressed air or oxygen shall not be used.
•
Flush the system with nitrogen blowing, fill the
refrigerant until the working pressure is reached,
ventilate to atmosphere, and then pull down to a
vacuum state.
•
For the final nitrogen blowing charge, the system shall
be ventilated down to atmospheric pressure.
•
The procedure is absolutely vital in case of brazing on
the pipings.
•
Make sure that the outlet of the vacuum pump is not
closed to any ignition sources and there is ventilation
available.
•
Do not apply any permanent inductive or capacitance
loads to the circuit without ensuring that this will not
exceed the permissible voltage and current permitted
for the air condiitoner.
Decommissioning
The following requirements must be fulfilled before and while
taking the decommissioning procedure:
•
Before decommissioning, the worker shall be familiar
with the product details.
•
The entire refrigerant shall be recovered safely.
•
Before starting the process, oil and refrigerant samples
shall be taken just in case analysis is required for reuse.
•
Before starting the process, power supply must be
available.
1
Be familiar with the equipment details.
30 English
2
Isolate the system electrically.
3
Before starting the process, make sure that:
•
Any mechanical equipment is available for handling
refrigerant cylinders.
•
All PPE (personal protective equipment) is available for
servicing.
•
The recovery process shall be supervised by a
competent person.
•
The recovery equipment and cylinders comply with the
standards.
4
Lower the refrigeration system, if possible.
5
If vacuuming is not possible, make a manifold so that
refrigerant can be easily removed from the parts of the
system.
6
Make sure that the cylinders are placed on the scales
before recovery.
7
Run the recovery system in accordance with the
manufacturer's instructions.
8
Do not overcharge the cylinders. (No more than
80 %)
9
Be sure to keep the cylinder within the maximum working
pressure, even temporarily.
10 After charging, make sure that the cylinders and the
equipment are promptly removed from the site and all
isolation valves are closed.
11 Recovered refrigerant shall not be charged into other
refrigeration system unless it is cleaned and checked.
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