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101
Additional refrigerant
1. The amount of refrigerant put into the outdoor unit
at the factory is sufficient to fill up to 20m of
refrigerant piping work.
2. If the length of the refrigerant piping work is 20m or
less, addition of refrigerant at the installation site is
unnecessary.
3. If the length of the piping work exceeds 20m, extra
refrigerant must be added. Refer to the outdoor
installation manual for details of the extra amounts.
4. Overcharge or undercharge of refrigerant in the
outdoor unit may cause malfunction of the
compressor.
Add Only R410A Refrigerant to These Units
Heat insulation
1. Provide heat insulation on the refrigerant piping on
both the liquid side and gas side separately, and
ensure that all joints in the insulation are compleatly
sealed (without gap).
2. Since the temperature of the piping on the gas side
increases during heating operations, the heat
insulating material used must be able to withstand
temperatures of more than 120°C.
3. Use the pipe insulation supplied in the accessory
pack to insulate the piping connecting section on
the indoor unit side.
Opened fully
Handle
Closed completely
Valve unit
Valve unit
Charge port
Charge port
Handle
Pull out the handle and
using cutting pliers, etc.
turn it counterclockwise
by 90˚. (Open fully)
Flare nut
Flare nut
Push in handle.
Handle position
*
1. Use the vacuum pump, vacuum pump adapters,
and gauge manifold referring to the manuals
attached to each tool before using them. For the
vacuum pump, check oil is filled up to the specified
line of the oil gauge.
*
2. While the air is purged, check again that the
connecting port of charge hose, which has a
projection to push the valve core, is firmly con-
nected to the charge port.
Valve handling precautions
• Open the valve stem or the handle until it strikes
the stopper. It is unnecessary to apply further
force.
• Securely tighten the cap with a torque wrench.
• Cap tightening torque
Ø6.4
Valve
Ø9.5
size
Ø12.7
Ø15.9
Charge port
14 to 18N•m (1.4 to 1.8kgf•m)
33 to 42N•m (3.3 to 4.2kgf•m)
33 to 42N•m (3.3 to 4.2kgf•m)
20 to 25N•m (2.0 to 2.5kgf•m)
14 to 18N•m (1.4 to 1.8kgf•m)
7
EVACUATING