Download INSTALLATION MANUAL

2. 4. Optional parts
2. ABOUT THE PRODUCT
CAUTION
2. 1. Precautions for using R410A refrigerant
The following parts are optional parts specific to R410A refrigerant.
Do not use parts other than those listed below.
WARNING
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.
Refer to the installation manual for the Branch box and the Separation tubes.
Parts name
Model name
Separation tube
UTP-SX248A
3 Branches
UTP-PY03A
2 Branches
UTP-PY02A
Branch box
External connect kit
(for External input/output)
UTY-XWZXZ3
External connect kit
(for Base heater)
UTY-XWZXZ4
2. 5. Operating range
Operating range
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.
Temperature
Indoor air intake
Outdoor air intake
Maximum
32 °C DB
46 °C DB
Minimum
18 °C DB
-5 °C DB
Cooling
2. 2. Special tools for R410A
Maximum
30 °C DB
24 °C DB
Minimum
16 °C DB
-15 °C DB
Heating
Tool name
Gauge manifold
Charge hose
Contents of change
Indoor humidity about 80% or less
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
(-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
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.
2. 3. Accessories
WARNING
• 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
Q’ty
Installation
manual
Application
(This book)
1
Drain cap
For outdoor unit drain piping work
2
Drain pipe
For outdoor unit drain piping work
1
Binder
For binding power supply cable and
connection cable
3
One-touch bush
For power supply cable and
connection cable installation
2
En-2