– –
– 152 –
After connecting the piping, check the
joints for gas leakage with gas leak
detector.
4. GAS LEAKAGE INSPECTION
5. AIR PURGE
Fig.29
Indoor unit
No gap
Coupler heat
insulation
(small)
Be sure to
overlap the
insulation
Large pipe
5. HEAT INSULATION ON THE PIPE JOINTS
(INDOOR SIDE ONLY)
Put coupler heat insulation on the joints (indoor side
only) (Fig. 29).
Small pipe
Coupler heat
insulation (large)
Coupler heat insulation
No gap
}
(2) Outdoor unit side
Tighten the flare nut of the connection pipe at the
outdoor unit valve connector. The tightening
method is the same as that as at the indoor side.
Connection pipe
(Large pipe)
(Small pipe)
Flare nut
3-way valve
2-way valve
Fig. 28
Pipe coupling
1. AIR PURGE
(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 in them lowers to below 1.5
mmHg.
(3) Disconnect the service hoses and fit the cap to the
charging valve (Tightening torque : 70 to 90 kgf •
cm).
(4) Remove the blank caps, and fully open the spindles
of the 2-way and 3-way valves with a hexagon
wrench (Torque : 2-way valve: 70 to 90 kgf • cm, 3-
way valve: 100 to 120 kgf • cm).
(5) Tighten the blank caps of the 2-way valve and 3-way
valve to the specified torque (200 to 250 kgf • cm).
2. ADDITIONAL CHARGE
Refrigerant suitable for a piping length of 5 m is
charged in the outdoor unit at the factory.
When the piping is longer than 5 m, additional charg-
ing is necessary.
For the additional amount, see page 52.
