Samsung AR09TXHQASINEU User's Manual & Installation Manual page 58

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.