Specifications

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(2) Connection of refrigerant piping
Indoor unit side
¡ Connect firmly gas and liquid side
pipings by Torque wrench.
¡ Specified torquing value:
Liquid side (ø6.35) : 15.7~19.6 N·m(1.6~2.0 kgf·m)
Gas side (ø12.7) : 39.2~49.0 N·m(4.0~5.0 kgf·m)
Outdoor unit side
¡ Connect firmly gas and liquid side
pipings by Torque wrench.
¡ Specified torquing value:
Liquid side (ø6.35): 15.7~19.6 N·m(1.6~2.0 kgf·m)
Gas side (ø12.7) : 39.2~49.0 N·m(4.0~5.0 kgf·m)
¡ Use one more spanner to fix the valve.
Spanner
(for fixing
the piping)
Torque
wrench
¡ Always use a Torque wrench and back up spanner to tighten the flare nut.
(3) Air purge
(a) Tighten all flare nuts in the pipings both indoor and outside wall so as not to cause leak.
(b) Connect operating valve, charge hose, manifold valve and vacuum pump as is illustrated below.
(c) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation.
Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads
– 0.1MPa (– 76cm Hg).
(d) After completing vacuum operation, fully open operating valve (Both gas and liquid sides) with hexagon headed wrench.
(e) Check for possible leakage of gas in the connection parts of both indoor and outdoor.
(4) Insulation of connecting portion
1) Cover the connection portion of the refrigerant piping with
the pipe cover and seal them.
If neglecting to do so, moisture occurs on the piping and
water will drip out.
2) Finishing and fixing
a) Tie up the piping with wrapping tape, and shape it so
that it conforms to which the pipe is attached.
b) Fix them with clamps as right figure.
Stop valve
(Two-way valve)
Service port
Charge hose
Vacuum pump
Charge hose
Handle Hi
(pressure)
Manifold
valve
Pressure
gauge
Compound
(Gauge)
Stop valve
(Three-way
valve)
Handle Lo
(pressure)
–76 cm Hg
Vinyl tape
To cover the connecting portion with
insulation materials, cut upper portion and
then seal it with insulation materials.
Cover the exterior portion with
covering tape and shape the piping
so it will match the contours of the
route that the piping to take. Also
fix the wiring and pipings to the
wall with clamps.
Insulation
Refrigerant piping
Electrical wiring
Covering tape
Drain hose
Tapping screw
Additional refrigerant charge
When refrigerant piping exceeds 7m conduct additional refrigerant charge after refrigerant sweeping.
A mount of additional charge per meter : 20g/m
Example of additional charge amount calculation
Calculate the additional charge amount, when the piping length is 10m.
(10 – 7)m × 20g/m = 60g 60g for additional charge amount