About The Unit; Precautions For Using The R410A Refrigerant; Special Tools For R410A; For Authorized Service Personnel Only - Rheem RICH07AVFJ Installation Manual

2. ABOUT THE UNIT

2.1. Precautions for using R410A refrigerant
The basic installation work procedures are the same
as conventional refrigerant models.
However, pay careful attention to the following points:
x
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 are
special. (See the table below.)
Especially, when replacing a conventional refriger-
ant (R22) model with a new refrigerant R410A model,
always replace the conventional piping and À are nuts
with the R410A piping and À are nuts.
x
Models that use refrigerant R410A have a different
charging port thread diameter to prevent errone-
ous charging with conventional refrigerant (R22)
and for safety. Therefore, check beforehand.
[The charging port thread diameter for R410A is
1/2 inch.]
x
Be careful that foreign matter (oil, water, etc.)
does not enter the piping than with conventional
refrigerant (R22) models. Also, when storing the
piping, securely seal the openings by pinching,
taping, etc.
x
When charging the refrigerant, take into account
the slight change in the composition of the gas
and liquid phases. A always charge from the liquid
phase where refrigerante composition is stable.

2.2. Special tools for R410A

Tool name
Gauge Pressure is high and cannot be measured
manifold with a R22 gauge. To prevent erroneous
mixing of other refrigerants, the diameter
of each port has been changed.
It is recommended the gauge with seals
30 in. Hg to 768 psi for high pressure. 30
in. Hg to 551 psi for low pressure.
Charge To increase pressure resistance, the hose
hose material and base size were changed.
Vacuum A conventional vacuum pump can be used
pump by installing a vacuum pump adapter.
Gas leakage Special gas leakage detector for HFC
detector refrigerant R410A.
Copper pipes
It is necessary to use seamless copper pipes and it is
desirable that the amount of residual oil is less than 0.004 oz/
100ft. Do not use copper pipes having a collapsed, deformed
or discolored portion (especially on the interior surface).
Otherwise, the expansion value or capillary tube may become
blocked with contaminants. As an air conditioner using R410A
incurs pressure higher than when using R22, it is necessary
to choose adequate materials. Thicknesses of copper pipes
used with R410A are as shown in the table. Never use copper
pipes thinner than that in the table even when it is available
on the market.
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Contents of change
WARNING
Do not use the existing (for R22) piping and flare
nuts.
• If the existing materials are used, the pressure inside
the refrigerant cycle will rise and cause failure, injury,
etc. (Use the special R410A materials.)
When installing and relocating the air conditioner,
do not mix gases other than the speci¿ ed refrigerant
(R410A) to enter the refrigerant cycle.
• If air or other gas enters the refrigerant cycle, the
pressure inside the cycle will rise to an abnormally
high value and cause failure, injury, etc.

2.3. For authorized service personnel only.

WARNING
For the air conditioner to operate satisfactorily, in-
stall it as outlined in this installation manual.
Connect the indoor unit and outdoor unit with the
air conditioner piping and cords available from your
local distributor. This installation manual describes
the correct connections using the installation set
available from your local distributor.
Installation work must be performed in accordance
with national wiring standards by authorized per-
sonnel only.
Do not turn on the power until all installation work is
complete.
CAUTION
This installation manual describes how to install the in-
door unit only.
To install the outdoor unit, refer to the installation manu-
al included with the outdoor unit.
x Be careful not to scratch the air conditioner when
handling it.
x After installation, explain correct operation to the
customer, using the operating manual.
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