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21
ABOUT THE PRODUCT
21 11
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:
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
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 flare nuts
with the R410A piping and flare 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 beforehand. [The charging port thread diameter for R410A is
1/2 UNF 20 threads per inch.]
3 Be careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant models. Also, when storing the piping, securely seal the openings 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 where refrigerant composition is stable.
21 21
Special tools for R410A
Tool name
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.
Gauge manifold
It is recommended the gauge with seals –0.1 to 5.3 MPa
(-1 to 53 bar) for high pressure. –0.1 to 3.8 MPa (-1 to 38
bar) for low pressure.
To increase pressure resistance, the hose material and
Charge hose
base size were changed.
A conventional vacuum pump can be used by installing a
Vacuum pump
vacuum pump adapter.
Gas leakage
Special gas leakage detector for HFC refrigerant R410A.
detector
21 21
Accessories
•
For installation purposes, be sure to use the parts supplied by the manufacturer
or other prescribed parts. The use of non-prescribed parts can cause serious
accidents such as the unit falling, water leakage, electric shock, or fire.
Do not throw away the connecting parts until the installation has been complete.
Name and shape
Installation
manual
Drain cap
Drain pipe
Binder
One-touch bush
9379069366_IM.indb 2
WARNING
Contents of change
WARNING
Q'ty
Application
(This book)
1
For outdoor unit drain piping work
2
For outdoor unit drain piping work
1
For binding power supply cable and
connection cable
3
For power supply cable and
connection cable installation
2
21 41
Optional parts
CAUTION
The following parts are optional parts specific to R410A refrigerant.
Do not use parts other than those listed below.
Refer to the installation manual for the Branch box and the Separation tubes.
Parts name
Separation tube
3 Branches
Branch box
2 Branches
External connect kit
(for External input/output)
External connect kit
(for Base heater)
21 21
Operating range
Operating range
Temperature
Maximum
Cooling
Minimum
Maximum
Heating
Minimum
Model name
UTP-SX248A
UTP-PY03A
UTP-PY02A
UTY-XWZXZ3
UTY-XWZXZ4
Indoor air intake
Outdoor air intake
32 °C DB
46 °C DB
18 °C DB
-5 °C DB
30 °C DB
24 °C DB
16 °C DB
-15 °C DB
Indoor humidity about 80% or less
En-2
15/11/2555 11:17:47
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