En-2
Special tools for R410A
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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 –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.
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
Thickness
6.35 mm (1/4 in.)
0.80 mm
9.52 mm (3/8 in.)
0.80 mm
12.70 mm (1/2 in.)
0.80 mm
15.88 mm (5/8 in.)
1.00 mm
19.05 mm (3/4 in.)
1.20 mm
Accessories
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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
2
For outdoor unit drain piping work
[Heat & Cool model (Reverse cycle)
only]
Drain pipe
1
Putty
1
For sealing
Adapter assy
12.7 mm / 9.52 mm
2
For use when connecting models
7–12 to outdoor port A or B
Adapter assy
12.7 mm / 15.88 mm
1
For use when connecting model 24
System configuration
21 41
Layout example for the indoor units and outdoor unit.
Circuit breaker
INDOOR UNITS
UNIT D
7-12
UNIT C
7-12
UNIT B
7-18
UNIT A
7-24
OUTDOOR UNIT
Power source
230 V ~ 50 Hz
Power cable
Connection cable
Refrigerant pipe
d
c
H1
H1
H2
b
a
CONNECTABLE INDOOR UNIT CAPACITY TYPE
21 41 11
CAUTION
The total capacity of the indoor units connected must be between 27,000 and
49,000BTU.
Be sure to check the connecting pattern in technical manual when installed since
connection pattern is specified in it. Operation cannot be guaranteed if connected by a
method not specified in it. It can cause the fault of the product.
At least three indoor units must be connected to the outdoor unit.
To install an indoor unit, refer to the installation Manual included with the indoor unit.
•
Outdoor port
Connectable model name
Standard port size
D
6.35/9.52
7 – 12
C
6.35/9.52
7 – 12
B
6.35/12.7
7 – 12
*1
/14 – 18
A
6.35/12.7
7 – 12
*1
/14 – 24
*2
*1
When connecting models 7–12 to the outdoor unit, the included adapter is necessary.
(For more information, refer to “4.1.3. HOW TO USE ADAPTER”.)
*2
When connecting model 24 to the outdoor unit, connect only two other indoor units to
the outdoor unit. (Max indoor unit capacity connection: 24,000 + 12,000 + 12,000 BTU)
In addition, the included adapter is necessary to connect the indoor unit to the outdoor
unit. (For more information, refer to “4.1.3. HOW TO USE ADAPTER”.)
UNIT D ø6.35, ø9.52
UNIT C ø6.35, ø9.52
UNIT B ø6.35, ø12.7
UNIT A ø6.35, ø12.7
LIMITATION OF REFRIGERANT PIPING LENGTH
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CAUTION
The total maximum pipe lengths and height difference of this product are shown in the
table.
If the units are further apart than this, correct operation cannot be guaranteed.
Total max1 length (a+b+c+d)
70 m (230 ft)
*3
Max1 length for each indoor unit
(a, b, c, or d)
25 m (82 ft)
Max1 height difference between
outdoor unit and each indoor unit
(H1)
15 m (49 ft)
Max1 height difference between
indoor units (H2)
10 m (33 ft)
Min1 length for each indoor unit
(a, b, c, or d)
5 m (16 ft)
Total min1 length (a+b+c+d)
20 m (66 ft)
*3
If the total piping length is 51 m or longer, additional refrigerant charging is necessary.
(For more information, refer to “6.2. Additional charging”.)
SELECTING PIPE SIZES
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The diameters of the connection pipes differ according to the capacity of the indoor unit.
Refer to the following table for the proper diameters of the connection pipes between the
indoor and outdoor units.
Capacity of indoor
unit
Gas pipe size
(thickness) [mm]
Liquid pipe size
(thickness) [mm]
7 – 12
ø9.52 (0.8)
ø6.35 (0.8)
14 – 18
ø12.7 (0.8)
ø6.35 (0.8)
24
ø15.88 (1.0)
ø6.35 (0.8)
CAUTION
Operation cannot be guaranteed if the correct combination of pipes, valves, etc., is not
used to connect the indoor and outdoor units.
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