En-3
2.2. Special tools for R410A
Tool name
Contents of change for R22 tool
Gauge
manifold
Pressure is huge 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 to use a gauge manifold with a high pressure display
range 500 microns to 768 psi (-0.1 to 5.3 MPa) and a low pressure
display range 500 microns to 551 psi (-0.1 to 3.8 MPa).
Charging
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.
• A conventional vacuum pump can be used by installing a vacuum
pump adapter.
• Be sure that the pump oil does not back flow into the system. Use one
capable for vacuum suction of 500 microns (-100.7kPa).
Gas leakage
detector
Special gas leakage detector for HFC refrigerant R410A.
2.3. Accessories
Use connecting parts as required.
Do not throw away the connecting parts until the installation has been complete.
Name and shape
Q’ty
Application
Specifications
manual
1
—
Installation manual
1
(This manual)
Drain cap
9
For outdoor unit drain piping
work
Drain pipe
1
For outdoor unit drain piping
work
Joint pipe A
1
(72, 96 model
only)
For connecting gas pipe
(L type)
Joint pipe B
1
(72, 96 model
only)
For connecting gas pipe
(Straight type)
Joint pipe C
1
(72, 96 model
only)
For connecting liquid pipe
(Straight type)
Joint pipe A-L
1
(120 model
only)
For connecting gas pipe
(L type)
Joint pipe B-L
1
(120 model
only)
For connecting gas pipe
(Straight type)
Push mount cable tie
4
For binding transmission cable
2.4. Combinations
The number of indoor units that can be connected are as follows:
Model
Outdoor unit cooling capacity
[Btu/h (kW)]
Maximum connectable indoor
units
AOU72RLAVL
72,000 (21.1)
18
AOU96RLAVL
96,000 (28.1)
24
AOU120RLAVL
120,000 (35.2)
30
2.5. Optional parts
CAUTION
The following parts are optional parts specific to R410A refrigerant.
Do not use parts other than those listed below.
2.5.1 Separation tube kit and Header
Separation tube and header uses the following parts. A header is used for connecting the
indoor units.
Total cooling capacity of
indoor units (x) [Btu/h] *1
Separation tube
Header
3-6 Branches
3-8 Branches
x < 96,500
UTP-AX090A
UTR-H0906L
UTR-H0908L
96,500 ≤ x
UTP-AX180A
UTR-H1806L
UTR-H1808L
*1: Total cooling capacity of indoor units means the total value of indoor unit cooling
capacity connected downstream.
2.5.2 External connect kit
Model
Usage
UTY-XWZXZ6
For External input (CN131, CN132, CN133, CN134)
For External output (Error status / CN136) (Operation status / CN137)
UTY-XWZXZF
For External input (CN135)
UTY-XWZXZ9
For External output (Base heater / CN115)
2.6. About unit of the length
All Fujitsu General products are manufactured to metric units and tolerances. United
States customary units are provided for reference only. In cases where exact dimensions
and tolerances are required, always refer to metric units.
3. INSTALLATION WORK
Please obtain the approval of the customer when selecting the location of installation and
installing the main unit.
3.1. Selecting an installation location
WARNING
Install the unit in a location that can withstand its weight, and where it will not topple or
fall.
Calculate the proper refrigerant concentration if you will be installing it in an enclosed
location.
Total amount of replenished refrigerant
in refrigerant facility [lb. (kg)]
≤
Refrigerant concentration [lb/Mcf (kg/m³)]
[25 lb/Mcf (0.39 kg/m³)]
Capacity of smallest room where unit
is installed [Mcf (m³)]
If the results of the calculation exceed the concentration limit, increase the room surface
area or install a ventilation duct.
CAUTION
Do not tilt the outdoor unit more than 0.3 degrees. However, do not install the unit with it
tilted towards the side containing the compressor.
Install this unit in a location with good ventilation.
If the unit must be installed in an area within easy reach of the general public, install as
necessary a protective fence or the like to prevent their access.
Install the unit in an area that would not inconvenience your neighbors, as they could be
affected by the airflow coming out from the outlet, noise, or vibration.
If it must be installed in proximity to your neighbors, be sure to obtain their approval.
If the unit is installed in a cold region that is affected by snow accumulation, snow fall, or
freezing, take appropriate measures to protect it from those elements.
To ensure a stable operation, install inlet and outlet ducts.
Install the unit in an area that would not cause problems even if the drain water is
discharged from the unit. Otherwise, provide drainage that would not affect people or
objects.
Install the unit in an area that has no heat sources, vapors, or the risk of the leakage of
flammable gas in the vicinity.
Install the unit in an area that is away from the exhaust or vent ports that discharge
vapor, soot, dust, or debris.
Install the indoor unit, outdoor unit, power supply cable, transmission cable and remote
control cable at least 40 in (1 m) away from a television or radio.
The purpose of this is to prevent TV reception interference or radio noise. (Even if they
are installed more than 40 in (1 m) apart, you could still receive noise under some signal
conditions.)
Keep the length of the piping of the indoor and outdoor units within the allowable range.
For maintenance purposes, do not bury the piping.
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