Performing Leak Tests; Pipe Installation With Indoor Units - Samsung AJ***JCJ2CH Installation Manual

Performing leak tests

A
Before completing the installation (insulation of the cables, hose and piping and fixing of the indoor unit to the installation
plate), you must check that there are no gas leaks.
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before recreating the vacuum
and recirculating the R-410A, it's responsible of installer to pressurize
the whole system with nitrogen (using a cylinder with pressure reducer)
at a pressure above 40 bar (gauge).
LEAK TEST WITH R-410A (after opening valves)
Before opening valves, discharge all the nitrogen into the system and
create vacuum according to page 13.
After opening valves, check leaks using a leak detector for refrigerant.
PUMP DOWN (before disconnecing t the refrigerant connections for unit repair,
removal or disposal)
Pump-down is an operation intended to collect all the system refrigerant in the outdoor unit.
This operation must be carried out before disconnecting the refrigerant pipe in order to avoid
refrigerant loss to the atmosphere.
- Shut off all the liquid valve with the Allen wrench.
- Turn the system on in cooling with fan operating at high velocity.
(Compressor will immediately start, provided 3 minutes have elapsed since the last stop).
- After 2 minutes of operation, shut down the suction valves with the same wrench.
- Turn the system off and switch mains supply off.
- Disconnect pipes. After disconnection, protect valves and tubing ends from dust.
- Compressor damage may occur if run at a negative suction pressure.
※ The designs and shape are subject to change according to the model.

Pipe installation with indoor units

Follow different orders depending on the capacity of indoor units.
◆ AJ020JCJ2CH
< 007/009/012 >
Install pipes between indoor and outdoor units orderly as [ A→B ].
◆ AJ024JCJ3CH
< 007/009/012 >
Install pipes between indoor and outdoor units orderly as [ A→B→C ].
< 018 >
Install pipes between indoor and outdoor units orderly as [ C ].
Port Indoor unit
A
007/009/012
B
007/009/012
C
018
1) Use tube connector (pipe 12.70 mm(1/2 inch), bolt 9.52 mm(3/8 inch))
20
1)
C D
A
B
AJ020JCJ2CH
A
B
C
AJ024JCJ3CH
OUTDOOR UNIT
A unit
B unit
C unit
D unit
※ The designs and shape are subject to change
according to the model.