92
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.
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.
Maintenance Procedures
This appliance is filled with R-32.
Summary of Contents for AR07TXFYAWKNEU
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