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SPECIAL PRECAUTIONS
When Connecting Refrigerant Tubing
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the
flare and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.
• Check carefully for leaks before starting the test run.
When Servicing
Turn the power OFF at the main circuit breaker panel before opening the unit
to check or repair electrical parts and wiring. Keep your fingers and clothing
away from any moving parts. Clean up the site after you finish, remembering
to check that no metal scraps or bits of wiring have been left inside the unit
being serviced. After installation, explain correct operation to the customer,
using the operating manual.
This air conditioner uses R410A.
Please make note of these differences
(1) Since the working pressure is 1.6 times higher than that of conventional
refrigerant(R22) models, some of the piping and installation and service
tools may be different.
(2) Models that use refrigerant R410A have a different charging port thread
diameter to prevent erroneous charging with conventional refrigerant(R22)
and for safety. Therefore, check beforehand. [The charging port thread
diameter for R410A is 1/2 threads per inch.]
(3) Be careful that foreign matter (oil, water, etc.) does not enter the pip-
ing. Also, when storing the piping, securely seal the opening by pinching,
taping, etc...
(4) When charging the refrigerant, take into account the slight change in
the composition of the gas and liquid phases, and always charge from the
liquid phase side whose composition is stable.
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