Step 8 Adding Refrigerant (R-410A) - Samsung AC MXADKH Series Installation Manual

Installation Procedure
5 Purge the air from the system using vacuum pump
for about 10 minutes.
• Close the valve of the low pressure side of
manifold gauge clockwise.
• Make sure that pressure gauge shows -0.1 MPa
(-76 cmHg) after about 10 minutes. This procedure
is very important to avoid a gas leak.
• Turn off the vacuum pump.
• Remove the hose of the low pressure side of
manifold gauge.
6 Open the stop valve of both liquid and gas sides.
7 Mount the valve stem nuts and the service port
cap to the valve, and tighten them at the torque of
183kgf•cm with a torque wrench.
8 Check for gas leakage.
• At this time, especially check for gas leakage from
the 3-way valve's stem nuts(A port), and from the
service port cap.
CAUTION
• Connect the indoor and outdoor units using pipes
with flared connections (not supplied). For the lines,
use insulated, unwelded, degreased and deoxidized
copper pipe, (Cu DHP type to ISO 1337 or UNI EN
12735-1), suitable for operating pressures of at least
4200 kPa and for a burst pressure of at least 20700
kPa. Copper pipe for hydro-sanitary applications is
completely unsuitable.
• For sizing and limits (height difference, line length,
max. bends, refrigerant charge, etc.) see "Connecting
refrigerant pipe section".

Step 8 Adding refrigerant (R-410A)

The outdoor unit is loaded with sufficient refrigerant
for the standard piping. Thus, refrigerant must be added
if the piping is lengthened. This operation can only
be performed by a qualified refrigeration specialist.
To determine the quantity of refrigerant charge, see
Calculating the quantity of refrigerant to add on page
19.
1 Check if the stop valve is closed completely.
2 Charge the refrigerant through the service port of the
liquid stop valve.
3 If you have any difficulty charging the refrigerant as
described in the steps above, take the following steps:
18
English
a Open the liquid stop valve and gas stop valve.
b Operate the air conditioner by pressing the K2
key on the outdoor unit PCB.
c After about 30 minutes, charge the refrigerant
through the service port of the gas stop valve.
Indoor Unit
Important information: regulation regarding the
refrigerant used
This product contains fluorinated greenhouse gases. Do
not vent gases into the atmosphere.
CAUTION
• Inform user if the system contains 5 tCO2e or more
of fluorinated greenhouse gases. In this case, it
must be checked for leakage at least once every 12
months, according to regulation No. 517/2014. This
activity must be covered by qualified personnel
only. In the case of the situation above, the installer
(or authorized person with responsibility for final
check) must provide a maintenance book, with all the
information recorded, according to REGULATION (EU)
No. 517/2014 OF THE EUROPEAN PARLIAMENT AND
OF THE COUNCIL of 16 April 2014 on fluorinated
greenhouse gases.
Please fill in the following with indelible ink on the
refrigerant charge label supplied with this product and
on this manual.
Balance
Ref
Vacuum
Pump
Gas side stop valve
(service port))
Liquid side stop valve
(service port)