Samsung SINGLE AC MNMSEH/EU Series Technical Data Book page 67

14. Installation
Outdoor Unit
2 Referring to the illustration below, tighten the flare nut on
section D first manually and then with a torque wrench,
applying the following torque.
Outdoor Unit
C
3 Connect the charging hose of low pressure side of
manifold gauge to the packed valve having a service port
as shown at the figure.
CAUTION
• The designs and shape are subject to change according to
the model.
4 Open the valve of the low pressure side(A) of manifold
gauge anticlockwise.
B(Liquid)
A(Gas)
D
Vacuum
Pump
A(Gas)
B(liquid)
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 69.
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:
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.
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