Unit installation

Spindle
CAUTION
1 Do not purge the air with refrigerants, but use a vacuum
pump to vacuum the installation! There is no extra re-
frigerant in the outdoor unit for air purging!
2 Use a vacuum pump and gauge manifold and charg-
ing hose for R410A exclusively. Using the same vacuum
for different refrigerants may damage the vacuum pump
or the unit.
Gauge manifold
Service hose
Vacuum pump
Lo
Hi
Blank cap
Cap
Hexagon wrench
Charging port
Service hose
with valve core
Service hose
with valve core
Service hose
with valve core
Service hose
with valve core
4. HOW TO USE ADAPTER (Connection ports of
outdoor unit)
• When using the ADAPTER, be careful not to overtighten the nut, or the
smaller pipe may be damaged.
• Apply a coat of refrigeration oil to the threaded connection port of the
outdoor unit where the flare nut comes in.
• Use appropriate wrenches to avoid damaging the connection thread by
overtightening the flare nut.
• Apply wrenches on both of flare nut (local part), and ADAPTER to tighten
them.
(4) When the flare nut is tightened properly by your hand, use a torque
wrench to finally tighten it.
Torque wrench
Holding spanner
Body side
5. VACUUM
(1) Remove the cap, and connect the gauge manifold and the vacuum
pump to the charging valve by the service hoses.
(2) Vacuum the indoor unit and the connecting pipes until the pressure
gauge indicates –0.1 MPa (–76 cmHg).
(3) When –0.1 MPa (–76 cmHg) is reached, operate the vacuum pump
for at least 30 minutes.
(4) Disconnect the service hoses and fit the cap to the charging valve to
the specified torque.
(5) Remove the blank caps, and fully open the spindles of the 2-way
and 3-way valves with a hexagon wrench [Torque: 6~7 N·m (4.4 to 5.2
lbf·in.)].
(6) Tighten the blank caps of the 2-way valve and 3-way valve to the
specified torque.
Tightening torque
20 to 25 N·m (14.6 to 18.4 lbf·in.)
20 to 25 N·m (14.6 to 18.4 lbf·in.)
25 to 30 N·m (18.4 to 22.1 lbf·in.)
30 to 35 N·m (22.1 to 25.8 lbf·in.)
35 to 40 N·m (25.8 to 29.5 lbf·in.)
10 to 12 N·m (7.4 to 8.9 lbf·in.)
Blank cap
6.35 mm (1/4 in.)
9.52 mm (3/8 in.)
12.70 mm (1/2 in.)
15.88 mm (5/8 in.)
19.05 mm (3/4 in.)
Charging port cap
Adapter tightening torque
Adapter type Tightening torque
ø12.7 mm / ø9.52 mm
49 to 61 N·m (35.44 to 44.12 lbf·in.)
(1/2 in.) (3/8 in.)
CAUTION
Hold the torque wrench at its grip, keeping it in the right
angle with the pipe, in order to tighten the flare nut
correctly.
Flare nut Tightening torque
6.35 mm (1/4 in.) dia.
9.52 mm (3/8 in.) dia.
12.70 mm (1/2 in.) dia.
15.88 mm (5/8 in.) dia.
19.05 mm (3/4 in.) dia.
16 to 18 N·m (11.57 to 13.02 lbf·in.)
30 to 42 N·m (21.70 to 30.38 lbf·in.)
49 to 61 N·m (35.44 to 44.12 lbf·in.)
63 to 75 N·m (45.56 to 54.25
lbf
·in.)
90 to 110 N·m (65.10 to 79.56
lbf
·in.)