Step 10 Performing The Gas Leak Test - Samsung AC MXAD Series Installation Manual

Installation Procedure
Instruction for installation and operation
• You should install the DPM according to the above
installation specification and eliminate the factors
that give electrical load to the both indoor units when
installing and operating. (Heater / window / front
door / ventilation / partition that divides space)
• You should provide sufficient instructions about the
operation method and specification features to users
and fill in caution phrases on wired remote controller
when necessary.
– <The air-conditioners in this area are special type
to be controlled simultaneously.>
Set up indoor quantity by key switch(K1, K2)
• Press and hold K1 switch to enter the setting mode
on the number of the installed indoor unit : Check
"A0" sign on 7-segment
– Press K2 switch to set the number of the installed
indoor unit :
Ex) If there are two indoor units, press K2 switch
twice, and check "A2" sign on 7-segment.
If there are three indoor units, press K2 switch
three times, and check "A3" sign on 7-segment.
If there are four indoor units, press K2 switch
four times, and check "A4" sign on 7-segment.
– Press K1 switch to complete setting the number
of the installed indoor unit : Check "AA" sign on
7-segment.
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Step 10 Performing the gas leak test

LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before
recreating the vacuum and recirculating the R-410A, it is
the responsibility of the installer to pressurize the whole
system with nitrogen (using a cylinder with pressure
reducer) at a pressure above 0.2 MPa, less than 4 MPa
(gauge).
LEAK TEST WITH R-410A (after opening valves)
Before opening valves, discharge all the nitrogen into
the system and create vacuum. After opening valves
check leaks using a leak detector for refrigerant R-410A.
Once you have completed all the connections, check for
possible leaks using leak detector specifically designed
for HFC refrigerants.
• The designs and shape are subject to change
according to the model.
A(Gas)
B(liquid)