En-2
...In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher than
drifting snow.
When Connecting Refrigerant Tubing
• Keep all tubing runs as short as possible.
• Use the
fl
are method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the
fl
are and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.
• Check carefully for leaks before opening the refrigerant
valves.
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.
WARNING
Never touch electrical components immediately
after the power supply has been turned off. Electri-
cal shock may occur. After turning off the power,
always wait 5 minutes or more before touching
electrical components.
Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
2. ABOUT THIS PRODUCT
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:
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 following table.)
Especially, when replacing a conventional refriger-
ant (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.
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
1/2-20 UNF.]
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.
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 refrigerant composition is stable.
2.2. Special tools for R410A refrigerant
Tool name
Contents of change
Gauge
manifold
Pressure is high and cannot be measured
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 inHg to 768 psi (-0.1 to 5.3 MPa) for
high pressure. -30 inHg to 551 psi (-0.1 to
3.8 MPa) for low pressure.
Charge
hose
To increase pressure resistance, the hose
material and base size were changed.
Vacuum
pump
A conventional vacuum pump can be used
by installing a vacuum pump adapter.
Gas leakage
detector
Special gas leakage detector for HFC
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/100 ft
(40 mg/10 m). 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. (Refer
to “3.1. Type of copper pipe and insulation material”) Never
use copper pipes thinner than that in the table even when it is
available on the market.
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