En-2
CAUTION
For the air conditioner to operate satisfactorily, install it as outlined in this installation
manual.
Connect the indoor unit and outdoor unit with the air conditioner piping and cables
available standards parts.This installation manual describes the correct connections
using the installation set available from our standard parts.
Installation work must be performed in accordance with national wiring standards by
authorized personnel only.
Do not use an extension cable.
Do not turn on the power until all installation work is complete.
Do not purge the air with refrigerants but use a vacuum pump to vacuum the
installation.
There is not extra refrigerant in the outdoor unit for air purging.
Use a vacuum pump for R410A exclusively.
Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
Use a clean gauge manifold and charging hose for R410A exclusively.
If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant
comes in contact with a flame, it produces a toxic gas.
After a long period of disuse in an environment 32 °F (0 °C) or lower, supply power to
the unit at least 12 hours before re-starting the unit.
•
Be careful not to scratch the air conditioner when handling it.
• 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.
2. ABOUT THE PRODUCT
2. 1. Precautions for using R410A refrigerant
WARNING
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 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.
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
1/2-20 UNF.]
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.
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 side whose
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 conventional
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 769 psi
(-0.1 to 5.3 MPa) for high pressure. 30 in. Hg 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 40 mg/10 m. Do not use copper pipes having a collapsed, deformed or
discolored portion (especially on the interior surface). Otherwise, the expansion valve or
capillary tube may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using conventional
refrigerant, 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.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in. (mm)]
Thickness [in. (mm)]
1/4 (6.35)
0.032 (0.80)
3/8 (9.52)
0.032 (0.80)
1/2 (12.70)
0.032 (0.80)
5/8 (15.88)
0.039 (1.00)
3/4 (19.05)
0.047 (1.20)
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
Application
Installation
manual
1
(This book)
Drain cap
5
For outdoor unit drain piping work
[36 type only]
Drain pipe
1
Adapter assy
1/2 in. → 3/8 in.
(12.70 mm) (9.52 mm)
1
For use when connecting indoor unit
models [7 to 12 type] to outdoor port A
[24, 36 type only]
Adapter assy
1/2 in. → 5/8 in.
(12.70 mm) (15.88 mm)
1
For use when connecting indoor unit
models [24 type] to outdoor port A
[36 type only]
2. 4.
System configuration
Layout example for the indoor units and outdoor unit
OUTDOOR UNIT : 36 type
a
b
c
d
H1
H1
H2
Power source
208/230 V ~ 60 Hz
Power supply cable
Connection cable
Refrigerant pipe
OUTDOOR UNIT
INDOOR UNITS
UNIT D
7-12
UNIT C
7-12
UNIT B
7-12
UNIT A
7-24
9374747153_IM.indb 2
2014/12/19 14:57:14
