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STANDARD ACCESSORIES
The following installation accessories are supplied. Use them as
required.
Name and Shape
Installation Manual
(This manual)
This air conditioner uses new refrigerant HFC (R410A).
The basic installation work procedures are the same as conventional refrigerant (R22) models.
However, pay careful attention to the following points:
(1) Since the working pressure is 1.6 times higher than that of conventional refrigerant (R22) mod-
els, some of the piping and installation and service tools are special. (See the table below.)
Especially, when replacing a conventional refrigerant (R22) model with a new refrigerant R410A model,
always replace the conventional piping and fl are nuts with the R410A piping and fl are nuts.
(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 before-
hand. [The charging port thread diameter for R410A is 1/2 threads per inch.]
(3) Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with refrigerant
(R22) models. 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.
Special tools for R410A
Tool name
Gauge manifold
Charge hose
Vacuum pump
Gas leakage detector
Q'ty
Name and Shape
Drain pipe
1
Pressure is high and cannot be measured with a conventional gauge. To prevent erroneous
mixing of other refrigerants, the diameter of each port has been changed.
It is recommended the gauge with seals-0.1 to 5.3 MPa (30 in.Hg to 768 psi) for high pressure.
-0.1 to 3.8 MPa (30 in.Hg to 551 psi) for low pressure.
To increase pressure resistance, the hose material and base size were changed.
A conventional vacuum pump can be used by installing a vacuum pump adapter.
Special gas leakage detector for HFC refrigerant R410A.
ELECTRICAL REQUIRE-
MENT
Q'ty
Always make the air conditioner power supply a special branch circuit and
provide a special switch and receptacle. Do not extend the power cord.
Always select the size that corresponds to the capacity of the break-
er to the size of the power cord.
1
MINIMUM CIRCUIT AMPACITY
MAXIMUM OVERCURRENT PROTECTION
(TIME DELAY FUSE OR HACR TYPE CIRCUIT BREAKER)
Contents of change
CAUTION
12000 BTU/h
12 A
20 A
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