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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 183
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 24.
• AC018/024TXQREH
1 Open the liquid stop valve and gas stop valve.
2 Operate the air conditioner by pressing the K2 button
on the outdoor unit PCB.
3 After about 30 minutes, charge the refrigerant
through the service port of the gas stop valve.
Indoor Unit
• AC036/048/060TXQR*H
1 Check if the stop valve is closed completely.
2 Charge the refrigerant through the service port of the
liquid stop valve.
NOTE
• Do not charge the refrigerant through the service port
of the gas 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
button on the outdoor unit PCB.
c After about 30 minutes, charge the refrigerant
through the service port of the gas stop valve.
Liquid side stop valve (service port)
Indoor Unit
Balance
Ref
Vacuum
Pump
Gas side stop valve
(service port)
Liquid side stop valve
(Non-service port)
Gas side stop valve (service port)
Balance
Outdoor Unit
Ref
Vacuum
Pump
English
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