Samsung AR09TXFCAWKNEU, Service Manual

Page: 122 / 123

121
SAMSUNG ELECTRONICS
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.
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.
This appliance is filled with R-32.