44-EN
43-EN
– 22 –
EN
Are there scratches or dents on the existing pipes?
Is it possible to operate the existing air conditioner?
y
After the existing air conditioner is operated in
cooling mode for approx. 30 minutes or longer,*
recover the refrigerant.
y
Refer to “13 Refrigerant recovery”
y
For cleaning the pipes and recovering oil
y
Refrigerant recovery: Pump down method
y
Remove the existing air conditioner from the piping
and carry out
fl
ushing (nitrogen pressure 0.5 MPa)
to remove any remains inside of the pipe.
Note:
In case of twin pipes, also be sure to
fl
ush the
branching pipe.
Connect the indoor / outdoor units to the existing
pipe.
y
Use a
fl
are nut attached to the main unit for the
indoor / outdoor units. (Do not use the
fl
are nut of
the existing pipe.)
y
Re-machine the
fl
are machining size to size for
R32/R410A.
y
(Airtight test), Vacuum dry, Refrigerant charge, Gas
leak check
In case that a gas pipe Ø19 mm or bigger is used for
the outdoor unit of GM80 (3 HP): (Our R32 model
3 to 6 HP gas pipe size is Ø15.9 mm)
→
See page 20 “Existing piping”.
Test run
Was largely discolored oil or a large quantity
of remains discharged? (When the oil deteriorates,
the color of the oil changes to a muddy or
black color.)
Existing pipes: Cannot be used.
y
Use new pipes.
Clean the pipes or use new pipes.
Piping necessary to change the
fl
are nut / machining
size due to pipe compression
1) Flare nut width: H
H
(mm)
Copper
pipe outer
diameter
Ø6.4
Ø9.5 Ø12.7 Ø15.9 Ø19.0
For R32,
R410A
17
22
26
29
36
For R22
Same as
above
24
27
Same
as
above
2) Flare machining size: A
A
(mm)
Copper
pipe outer
diameter
Ø6.4
Ø9.5 Ø12.7 Ø15.9 Ø19.0
For R32,
R410A
9.1
13.2
16.6
19.7
24.0
For R22
9.0
13.0
16.2
19.4
23.3
Becomes a little larger for R32/R410A
Do not apply refrigerator oil to the
fl
are surface.
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
YES
YES
NO
NO
NO
YES
Nitrogen gas pressure 0.5 MPa
[2] Minimum
fl
oor area : A
min
(m²)
Total refrigerant
quantity*
Floor standing
unit
Wall mounted
unit
Ceiling mounted
unit
h
0
0.6
1.8
2.2
M (kg)
A
min
(m
²
)
2HP
0.90
6.95
0.77
0.52
0.92
7.26
0.81
0.54
0.94
7.58
0.84
0.56
0.96
7.91
0.88
0.59
0.98
8.24
0.92
0.61
1.00
8.58
0.95
0.64
1.02
8.93
0.99
0.66
1.04
9.28
1.03
0.69
1.06
9.64
1.07
0.72
1.08
10.01
1.11
0.74
Max.
1.10
10.38
1.15
0.77
3HP
1.30
14.50
1.61
1.08
1.34
15.41
1.71
1.15
1.38
16.34
1.82
1.22
1.42
17.30
1.92
1.29
1.46
18.29
2.03
1.36
1.50
19.31
2.15
1.44
1.54
20.35
2.26
1.51
1.58
21.42
2.38
1.59
1.62
22.52
2.50
1.67
1.66
23.64
2.63
1.76
Max.
1.70
24.80
2.76
1.84
* Total refrigerant quantity: Refrigerant quantity pre-charged at f Additional
refrigerant quantity charged during installation
